diff --git a/Changelog b/Changelog
index 244e6b35f9..41b0bdce3b 100644
--- a/Changelog
+++ b/Changelog
@@ -4,6 +4,7 @@ releases are sorted from youngest to oldest.
 version next:
 - INI and flat output in ffprobe
 - Scene detection in libavfilter
+- Indeo Audio decoder
 
 
 version 0.11:
diff --git a/cmdutils.c b/cmdutils.c
index bedc15bf38..0ddd9b3cee 100644
--- a/cmdutils.c
+++ b/cmdutils.c
@@ -41,6 +41,7 @@
 #include "libavutil/avassert.h"
 #include "libavutil/avstring.h"
 #include "libavutil/mathematics.h"
+#include "libavutil/imgutils.h"
 #include "libavutil/parseutils.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/eval.h"
@@ -1222,3 +1223,144 @@ void *grow_array(void *array, int elem_size, int *size, int new_size)
     }
     return array;
 }
+
+static int alloc_buffer(FrameBuffer **pool, AVCodecContext *s, FrameBuffer **pbuf)
+{
+    FrameBuffer  *buf = av_mallocz(sizeof(*buf));
+    int i, ret;
+    const int pixel_size = av_pix_fmt_descriptors[s->pix_fmt].comp[0].step_minus1+1;
+    int h_chroma_shift, v_chroma_shift;
+    int edge = 32; // XXX should be avcodec_get_edge_width(), but that fails on svq1
+    int w = s->width, h = s->height;
+
+    if (!buf)
+        return AVERROR(ENOMEM);
+
+    avcodec_align_dimensions(s, &w, &h);
+
+    if (!(s->flags & CODEC_FLAG_EMU_EDGE)) {
+        w += 2*edge;
+        h += 2*edge;
+    }
+
+    if ((ret = av_image_alloc(buf->base, buf->linesize, w, h,
+                              s->pix_fmt, 32)) < 0) {
+        av_freep(&buf);
+        return ret;
+    }
+    /* XXX this shouldn't be needed, but some tests break without this line
+     * those decoders are buggy and need to be fixed.
+     * the following tests fail:
+     * cdgraphics, ansi, aasc, fraps-v1, qtrle-1bit
+     */
+    memset(buf->base[0], 128, ret);
+
+    avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
+    for (i = 0; i < FF_ARRAY_ELEMS(buf->data); i++) {
+        const int h_shift = i==0 ? 0 : h_chroma_shift;
+        const int v_shift = i==0 ? 0 : v_chroma_shift;
+        if ((s->flags & CODEC_FLAG_EMU_EDGE) || !buf->linesize[1] || !buf->base[i])
+            buf->data[i] = buf->base[i];
+        else
+            buf->data[i] = buf->base[i] +
+                           FFALIGN((buf->linesize[i]*edge >> v_shift) +
+                                   (pixel_size*edge >> h_shift), 32);
+    }
+    buf->w       = s->width;
+    buf->h       = s->height;
+    buf->pix_fmt = s->pix_fmt;
+    buf->pool    = pool;
+
+    *pbuf = buf;
+    return 0;
+}
+
+int codec_get_buffer(AVCodecContext *s, AVFrame *frame)
+{
+    FrameBuffer **pool = s->opaque;
+    FrameBuffer *buf;
+    int ret, i;
+
+    if(av_image_check_size(s->width, s->height, 0, s) || s->pix_fmt<0)
+        return -1;
+
+    if (!*pool && (ret = alloc_buffer(pool, s, pool)) < 0)
+        return ret;
+
+    buf              = *pool;
+    *pool            = buf->next;
+    buf->next        = NULL;
+    if (buf->w != s->width || buf->h != s->height || buf->pix_fmt != s->pix_fmt) {
+        av_freep(&buf->base[0]);
+        av_free(buf);
+        if ((ret = alloc_buffer(pool, s, &buf)) < 0)
+            return ret;
+    }
+    av_assert0(!buf->refcount);
+    buf->refcount++;
+
+    frame->opaque        = buf;
+    frame->type          = FF_BUFFER_TYPE_USER;
+    frame->extended_data = frame->data;
+    frame->pkt_pts       = s->pkt ? s->pkt->pts : AV_NOPTS_VALUE;
+    frame->width         = buf->w;
+    frame->height        = buf->h;
+    frame->format        = buf->pix_fmt;
+    frame->sample_aspect_ratio = s->sample_aspect_ratio;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(buf->data); i++) {
+        frame->base[i]     = buf->base[i];  // XXX h264.c uses base though it shouldn't
+        frame->data[i]     = buf->data[i];
+        frame->linesize[i] = buf->linesize[i];
+    }
+
+    return 0;
+}
+
+static void unref_buffer(FrameBuffer *buf)
+{
+    FrameBuffer **pool = buf->pool;
+
+    av_assert0(buf->refcount > 0);
+    buf->refcount--;
+    if (!buf->refcount) {
+        FrameBuffer *tmp;
+        for(tmp= *pool; tmp; tmp= tmp->next)
+            av_assert1(tmp != buf);
+
+        buf->next = *pool;
+        *pool = buf;
+    }
+}
+
+void codec_release_buffer(AVCodecContext *s, AVFrame *frame)
+{
+    FrameBuffer *buf = frame->opaque;
+    int i;
+
+    if(frame->type!=FF_BUFFER_TYPE_USER)
+        return avcodec_default_release_buffer(s, frame);
+
+    for (i = 0; i < FF_ARRAY_ELEMS(frame->data); i++)
+        frame->data[i] = NULL;
+
+    unref_buffer(buf);
+}
+
+void filter_release_buffer(AVFilterBuffer *fb)
+{
+    FrameBuffer *buf = fb->priv;
+    av_free(fb);
+    unref_buffer(buf);
+}
+
+void free_buffer_pool(FrameBuffer **pool)
+{
+    FrameBuffer *buf = *pool;
+    while (buf) {
+        *pool = buf->next;
+        av_freep(&buf->base[0]);
+        av_free(buf);
+        buf = *pool;
+    }
+}
diff --git a/cmdutils.h b/cmdutils.h
index 07a8d32a2c..d99037cfb2 100644
--- a/cmdutils.h
+++ b/cmdutils.h
@@ -386,4 +386,46 @@ void exit_program(int ret);
  */
 void *grow_array(void *array, int elem_size, int *size, int new_size);
 
+typedef struct FrameBuffer {
+    uint8_t *base[4];
+    uint8_t *data[4];
+    int  linesize[4];
+
+    int h, w;
+    enum PixelFormat pix_fmt;
+
+    int refcount;
+    struct FrameBuffer **pool;  ///< head of the buffer pool
+    struct FrameBuffer *next;
+} FrameBuffer;
+
+/**
+ * Get a frame from the pool. This is intended to be used as a callback for
+ * AVCodecContext.get_buffer.
+ *
+ * @param s codec context. s->opaque must be a pointer to the head of the
+ *          buffer pool.
+ * @param frame frame->opaque will be set to point to the FrameBuffer
+ *              containing the frame data.
+ */
+int codec_get_buffer(AVCodecContext *s, AVFrame *frame);
+
+/**
+ * A callback to be used for AVCodecContext.release_buffer along with
+ * codec_get_buffer().
+ */
+void codec_release_buffer(AVCodecContext *s, AVFrame *frame);
+
+/**
+ * A callback to be used for AVFilterBuffer.free.
+ * @param fb buffer to free. fb->priv must be a pointer to the FrameBuffer
+ *           containing the buffer data.
+ */
+void filter_release_buffer(AVFilterBuffer *fb);
+
+/**
+ * Free all the buffers in the pool. This must be called after all the
+ * buffers have been released.
+ */
+void free_buffer_pool(FrameBuffer **pool);
 #endif /* CMDUTILS_H */
diff --git a/doc/general.texi b/doc/general.texi
index 876a0f3397..92961ffdb0 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -748,6 +748,7 @@ following image formats are supported:
     @tab encoding supported through external library libgsm
 @item GSM Microsoft variant  @tab  E  @tab  X
     @tab encoding supported through external library libgsm
+@item IAC (Indeo Audio Coder)  @tab     @tab  X
 @item IMC (Intel Music Coder)  @tab     @tab  X
 @item MACE (Macintosh Audio Compression/Expansion) 3:1  @tab     @tab  X
 @item MACE (Macintosh Audio Compression/Expansion) 6:1  @tab     @tab  X
diff --git a/ffmpeg.c b/ffmpeg.c
index a897c9e917..95f3e521b3 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -201,19 +201,6 @@ typedef struct FilterGraph {
     int         nb_outputs;
 } FilterGraph;
 
-typedef struct FrameBuffer {
-    uint8_t *base[4];
-    uint8_t *data[4];
-    int  linesize[4];
-
-    int h, w;
-    enum PixelFormat pix_fmt;
-
-    int refcount;
-    struct InputStream *ist;
-    struct FrameBuffer *next;
-} FrameBuffer;
-
 typedef struct InputStream {
     int file_index;
     AVStream *st;
@@ -534,145 +521,6 @@ static void reset_options(OptionsContext *o, int is_input)
     init_opts();
 }
 
-static int alloc_buffer(InputStream *ist, AVCodecContext *s, FrameBuffer **pbuf)
-{
-    FrameBuffer  *buf = av_mallocz(sizeof(*buf));
-    int i, ret;
-    const int pixel_size = av_pix_fmt_descriptors[s->pix_fmt].comp[0].step_minus1+1;
-    int h_chroma_shift, v_chroma_shift;
-    int edge = 32; // XXX should be avcodec_get_edge_width(), but that fails on svq1
-    int w = s->width, h = s->height;
-
-    if (!buf)
-        return AVERROR(ENOMEM);
-
-    avcodec_align_dimensions(s, &w, &h);
-
-    if (!(s->flags & CODEC_FLAG_EMU_EDGE)) {
-        w += 2*edge;
-        h += 2*edge;
-    }
-
-    if ((ret = av_image_alloc(buf->base, buf->linesize, w, h,
-                              s->pix_fmt, 32)) < 0) {
-        av_freep(&buf);
-        return ret;
-    }
-    /* XXX this shouldn't be needed, but some tests break without this line
-     * those decoders are buggy and need to be fixed.
-     * the following tests fail:
-     * cdgraphics, ansi, aasc, fraps-v1, qtrle-1bit
-     */
-    memset(buf->base[0], 128, ret);
-
-    avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
-    for (i = 0; i < FF_ARRAY_ELEMS(buf->data); i++) {
-        const int h_shift = i==0 ? 0 : h_chroma_shift;
-        const int v_shift = i==0 ? 0 : v_chroma_shift;
-        if ((s->flags & CODEC_FLAG_EMU_EDGE) || !buf->linesize[1] || !buf->base[i])
-            buf->data[i] = buf->base[i];
-        else
-            buf->data[i] = buf->base[i] +
-                           FFALIGN((buf->linesize[i]*edge >> v_shift) +
-                                   (pixel_size*edge >> h_shift), 32);
-    }
-    buf->w       = s->width;
-    buf->h       = s->height;
-    buf->pix_fmt = s->pix_fmt;
-    buf->ist     = ist;
-
-    *pbuf = buf;
-    return 0;
-}
-
-static void free_buffer_pool(InputStream *ist)
-{
-    FrameBuffer *buf = ist->buffer_pool;
-    while (buf) {
-        ist->buffer_pool = buf->next;
-        av_freep(&buf->base[0]);
-        av_free(buf);
-        buf = ist->buffer_pool;
-    }
-}
-
-static void unref_buffer(InputStream *ist, FrameBuffer *buf)
-{
-    av_assert0(buf->refcount > 0);
-    buf->refcount--;
-    if (!buf->refcount) {
-        FrameBuffer *tmp;
-        for(tmp= ist->buffer_pool; tmp; tmp= tmp->next)
-            av_assert1(tmp != buf);
-        buf->next = ist->buffer_pool;
-        ist->buffer_pool = buf;
-    }
-}
-
-static int codec_get_buffer(AVCodecContext *s, AVFrame *frame)
-{
-    InputStream *ist = s->opaque;
-    FrameBuffer *buf;
-    int ret, i;
-
-    if(av_image_check_size(s->width, s->height, 0, s) || s->pix_fmt<0)
-        return -1;
-
-    if (!ist->buffer_pool && (ret = alloc_buffer(ist, s, &ist->buffer_pool)) < 0)
-        return ret;
-
-    buf              = ist->buffer_pool;
-    ist->buffer_pool = buf->next;
-    buf->next        = NULL;
-    if (buf->w != s->width || buf->h != s->height || buf->pix_fmt != s->pix_fmt) {
-        av_freep(&buf->base[0]);
-        av_free(buf);
-        if ((ret = alloc_buffer(ist, s, &buf)) < 0)
-            return ret;
-    }
-    av_assert0(!buf->refcount);
-    buf->refcount++;
-
-    frame->opaque        = buf;
-    frame->type          = FF_BUFFER_TYPE_USER;
-    frame->extended_data = frame->data;
-    frame->pkt_pts       = s->pkt ? s->pkt->pts : AV_NOPTS_VALUE;
-    frame->width         = buf->w;
-    frame->height        = buf->h;
-    frame->format        = buf->pix_fmt;
-    frame->sample_aspect_ratio = s->sample_aspect_ratio;
-
-    for (i = 0; i < FF_ARRAY_ELEMS(buf->data); i++) {
-        frame->base[i]     = buf->base[i];  // XXX h264.c uses base though it shouldn't
-        frame->data[i]     = buf->data[i];
-        frame->linesize[i] = buf->linesize[i];
-    }
-
-    return 0;
-}
-
-static void codec_release_buffer(AVCodecContext *s, AVFrame *frame)
-{
-    InputStream *ist = s->opaque;
-    FrameBuffer *buf = frame->opaque;
-    int i;
-
-    if(frame->type!=FF_BUFFER_TYPE_USER)
-        return avcodec_default_release_buffer(s, frame);
-
-    for (i = 0; i < FF_ARRAY_ELEMS(frame->data); i++)
-        frame->data[i] = NULL;
-
-    unref_buffer(ist, buf);
-}
-
-static void filter_release_buffer(AVFilterBuffer *fb)
-{
-    FrameBuffer *buf = fb->priv;
-    av_free(fb);
-    unref_buffer(buf->ist, buf);
-}
-
 static enum PixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum PixelFormat target)
 {
     if (codec && codec->pix_fmts) {
@@ -1508,7 +1356,7 @@ void av_noreturn exit_program(int ret)
     for (i = 0; i < nb_input_streams; i++) {
         av_freep(&input_streams[i]->decoded_frame);
         av_dict_free(&input_streams[i]->opts);
-        free_buffer_pool(input_streams[i]);
+        free_buffer_pool(&input_streams[i]->buffer_pool);
         av_freep(&input_streams[i]->filters);
         av_freep(&input_streams[i]);
     }
@@ -2845,7 +2693,7 @@ static int init_input_stream(int ist_index, char *error, int error_len)
         if (codec->type == AVMEDIA_TYPE_VIDEO && ist->dr1) {
             ist->st->codec->get_buffer     = codec_get_buffer;
             ist->st->codec->release_buffer = codec_release_buffer;
-            ist->st->codec->opaque         = ist;
+            ist->st->codec->opaque         = &ist->buffer_pool;
         }
 
         if (!av_dict_get(ist->opts, "threads", NULL, 0))
diff --git a/ffplay.c b/ffplay.c
index 3134c3a9d1..86444a822b 100644
--- a/ffplay.c
+++ b/ffplay.c
@@ -49,6 +49,7 @@
 # include "libavfilter/avfilter.h"
 # include "libavfilter/avfiltergraph.h"
 # include "libavfilter/buffersink.h"
+# include "libavfilter/buffersrc.h"
 #endif
 
 #include <SDL.h>
@@ -227,7 +228,10 @@ typedef struct VideoState {
     int step;
 
 #if CONFIG_AVFILTER
+    AVFilterContext *in_video_filter;           ///< the first filter in the video chain
     AVFilterContext *out_video_filter;          ///< the last filter in the video chain
+    int use_dr1;
+    FrameBuffer *buffer_pool;
 #endif
 
     int refresh;
@@ -1545,222 +1549,29 @@ static int get_video_frame(VideoState *is, AVFrame *frame, int64_t *pts, AVPacke
 }
 
 #if CONFIG_AVFILTER
-typedef struct {
-    VideoState *is;
-    AVFrame *frame;
-    int use_dr1;
-} FilterPriv;
-
-static int input_get_buffer(AVCodecContext *codec, AVFrame *pic)
-{
-    AVFilterContext *ctx = codec->opaque;
-    AVFilterBufferRef  *ref;
-    int perms = AV_PERM_WRITE;
-    int i, w, h, stride[AV_NUM_DATA_POINTERS];
-    unsigned edge;
-    int pixel_size;
-
-    av_assert0(codec->flags & CODEC_FLAG_EMU_EDGE);
-
-    if (codec->codec->capabilities & CODEC_CAP_NEG_LINESIZES)
-        perms |= AV_PERM_NEG_LINESIZES;
-
-    if (pic->buffer_hints & FF_BUFFER_HINTS_VALID) {
-        if (pic->buffer_hints & FF_BUFFER_HINTS_READABLE) perms |= AV_PERM_READ;
-        if (pic->buffer_hints & FF_BUFFER_HINTS_PRESERVE) perms |= AV_PERM_PRESERVE;
-        if (pic->buffer_hints & FF_BUFFER_HINTS_REUSABLE) perms |= AV_PERM_REUSE2;
-    }
-    if (pic->reference) perms |= AV_PERM_READ | AV_PERM_PRESERVE;
-
-    w = codec->width;
-    h = codec->height;
-
-    if(av_image_check_size(w, h, 0, codec) || codec->pix_fmt<0)
-        return -1;
-
-    avcodec_align_dimensions2(codec, &w, &h, stride);
-    edge = codec->flags & CODEC_FLAG_EMU_EDGE ? 0 : avcodec_get_edge_width();
-    w += edge << 1;
-    h += edge << 1;
-    if (codec->pix_fmt != ctx->outputs[0]->format) {
-        av_log(codec, AV_LOG_ERROR, "Pixel format mismatches %d %d\n", codec->pix_fmt, ctx->outputs[0]->format);
-        return -1;
-    }
-    if (!(ref = avfilter_get_video_buffer(ctx->outputs[0], perms, w, h)))
-        return -1;
-
-    pixel_size = av_pix_fmt_descriptors[ref->format].comp[0].step_minus1 + 1;
-    ref->video->w = codec->width;
-    ref->video->h = codec->height;
-    for (i = 0; i < 4; i ++) {
-        unsigned hshift = (i == 1 || i == 2) ? av_pix_fmt_descriptors[ref->format].log2_chroma_w : 0;
-        unsigned vshift = (i == 1 || i == 2) ? av_pix_fmt_descriptors[ref->format].log2_chroma_h : 0;
-
-        pic->base[i]     = ref->data[i];
-        if (ref->data[i]) {
-            ref->data[i]    += ((edge * pixel_size) >> hshift) + ((edge * ref->linesize[i]) >> vshift);
-        }
-        pic->data[i]     = ref->data[i];
-        pic->linesize[i] = ref->linesize[i];
-    }
-    pic->opaque = ref;
-    pic->type   = FF_BUFFER_TYPE_USER;
-    pic->reordered_opaque = codec->reordered_opaque;
-    pic->width               = codec->width;
-    pic->height              = codec->height;
-    pic->format              = codec->pix_fmt;
-    pic->sample_aspect_ratio = codec->sample_aspect_ratio;
-    if (codec->pkt) pic->pkt_pts = codec->pkt->pts;
-    else            pic->pkt_pts = AV_NOPTS_VALUE;
-    return 0;
-}
-
-static void input_release_buffer(AVCodecContext *codec, AVFrame *pic)
-{
-    memset(pic->data, 0, sizeof(pic->data));
-    avfilter_unref_buffer(pic->opaque);
-}
-
-static int input_reget_buffer(AVCodecContext *codec, AVFrame *pic)
-{
-    AVFilterBufferRef *ref = pic->opaque;
-
-    if (pic->data[0] == NULL) {
-        pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
-        return codec->get_buffer(codec, pic);
-    }
-
-    if ((codec->width != ref->video->w) || (codec->height != ref->video->h) ||
-        (codec->pix_fmt != ref->format)) {
-        av_log(codec, AV_LOG_ERROR, "Picture properties changed.\n");
-        return -1;
-    }
-
-    pic->reordered_opaque = codec->reordered_opaque;
-    if (codec->pkt) pic->pkt_pts = codec->pkt->pts;
-    else            pic->pkt_pts = AV_NOPTS_VALUE;
-    return 0;
-}
-
-static int input_init(AVFilterContext *ctx, const char *args, void *opaque)
-{
-    FilterPriv *priv = ctx->priv;
-    AVCodecContext *codec;
-    if (!opaque) return -1;
-
-    priv->is = opaque;
-    codec    = priv->is->video_st->codec;
-    codec->opaque = ctx;
-    if (codec->codec->capabilities & CODEC_CAP_DR1) {
-        av_assert0(codec->flags & CODEC_FLAG_EMU_EDGE);
-        priv->use_dr1 = 1;
-        codec->get_buffer     = input_get_buffer;
-        codec->release_buffer = input_release_buffer;
-        codec->reget_buffer   = input_reget_buffer;
-        codec->thread_safe_callbacks = 1;
-    }
-
-    priv->frame = avcodec_alloc_frame();
-
-    return 0;
-}
-
-static void input_uninit(AVFilterContext *ctx)
-{
-    FilterPriv *priv = ctx->priv;
-    av_free(priv->frame);
-}
-
-static int input_request_frame(AVFilterLink *link)
-{
-    FilterPriv *priv = link->src->priv;
-    AVFilterBufferRef *picref;
-    int64_t pts = 0;
-    AVPacket pkt;
-    int ret;
-
-    while (!(ret = get_video_frame(priv->is, priv->frame, &pts, &pkt)))
-        av_free_packet(&pkt);
-    if (ret < 0)
-        return -1;
-
-    if (priv->use_dr1 && priv->frame->opaque) {
-        picref = avfilter_ref_buffer(priv->frame->opaque, ~0);
-    } else {
-        picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, priv->frame->width, priv->frame->height);
-        av_image_copy(picref->data, picref->linesize,
-                      (const uint8_t **)(void **)priv->frame->data, priv->frame->linesize,
-                      picref->format, priv->frame->width, priv->frame->height);
-    }
-    av_free_packet(&pkt);
-
-    avfilter_copy_frame_props(picref, priv->frame);
-    picref->video->sample_aspect_ratio = av_guess_sample_aspect_ratio(priv->is->ic, priv->is->video_st, priv->frame);
-    picref->pts = pts;
-
-    avfilter_start_frame(link, picref);
-    avfilter_draw_slice(link, 0, picref->video->h, 1);
-    avfilter_end_frame(link);
-
-    return 0;
-}
-
-static int input_query_formats(AVFilterContext *ctx)
-{
-    FilterPriv *priv = ctx->priv;
-    enum PixelFormat pix_fmts[] = {
-        priv->is->video_st->codec->pix_fmt, PIX_FMT_NONE
-    };
-
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
-    return 0;
-}
-
-static int input_config_props(AVFilterLink *link)
-{
-    FilterPriv *priv  = link->src->priv;
-    AVStream *s = priv->is->video_st;
-
-    link->w = s->codec->width;
-    link->h = s->codec->height;
-    link->sample_aspect_ratio = s->sample_aspect_ratio.num ?
-        s->sample_aspect_ratio : s->codec->sample_aspect_ratio;
-    link->time_base = s->time_base;
-
-    return 0;
-}
-
-static AVFilter input_filter =
-{
-    .name      = "ffplay_input",
-
-    .priv_size = sizeof(FilterPriv),
-
-    .init      = input_init,
-    .uninit    = input_uninit,
-
-    .query_formats = input_query_formats,
-
-    .inputs    = (AVFilterPad[]) {{ .name = NULL }},
-    .outputs   = (AVFilterPad[]) {{ .name = "default",
-                                    .type = AVMEDIA_TYPE_VIDEO,
-                                    .request_frame = input_request_frame,
-                                    .config_props  = input_config_props, },
-                                  { .name = NULL }},
-};
-
 static int configure_video_filters(AVFilterGraph *graph, VideoState *is, const char *vfilters)
 {
     static const enum PixelFormat pix_fmts[] = { PIX_FMT_YUV420P, PIX_FMT_NONE };
     char sws_flags_str[128];
+    char buffersrc_args[256];
     int ret;
     AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
-    AVFilterContext *filt_src = NULL, *filt_out = NULL, *filt_format;;
+    AVFilterContext *filt_src = NULL, *filt_out = NULL, *filt_format;
+    AVCodecContext *codec = is->video_st->codec;
+
     snprintf(sws_flags_str, sizeof(sws_flags_str), "flags=%d", sws_flags);
     graph->scale_sws_opts = av_strdup(sws_flags_str);
 
-    if ((ret = avfilter_graph_create_filter(&filt_src, &input_filter, "src",
-                                            NULL, is, graph)) < 0)
+    snprintf(buffersrc_args, sizeof(buffersrc_args), "%d:%d:%d:%d:%d:%d:%d",
+             codec->width, codec->height, codec->pix_fmt,
+             is->video_st->time_base.num, is->video_st->time_base.den,
+             codec->sample_aspect_ratio.num, codec->sample_aspect_ratio.den);
+
+
+    if ((ret = avfilter_graph_create_filter(&filt_src,
+                                            avfilter_get_by_name("buffer"),
+                                            "src", buffersrc_args, NULL,
+                                            graph)) < 0)
         return ret;
 
 #if FF_API_OLD_VSINK_API
@@ -1809,8 +1620,16 @@ static int configure_video_filters(AVFilterGraph *graph, VideoState *is, const c
     if ((ret = avfilter_graph_config(graph, NULL)) < 0)
         return ret;
 
+    is->in_video_filter  = filt_src;
     is->out_video_filter = filt_out;
 
+    if (codec->codec->capabilities & CODEC_CAP_DR1) {
+        is->use_dr1 = 1;
+        codec->get_buffer     = codec_get_buffer;
+        codec->release_buffer = codec_release_buffer;
+        codec->opaque         = &is->buffer_pool;
+    }
+
     return ret;
 }
 
@@ -1826,7 +1645,7 @@ static int video_thread(void *arg)
 
 #if CONFIG_AVFILTER
     AVFilterGraph *graph = avfilter_graph_alloc();
-    AVFilterContext *filt_out = NULL;
+    AVFilterContext *filt_out = NULL, *filt_in = NULL;
     int last_w = is->video_st->codec->width;
     int last_h = is->video_st->codec->height;
 
@@ -1837,18 +1656,31 @@ static int video_thread(void *arg)
         SDL_PushEvent(&event);
         goto the_end;
     }
+    filt_in  = is->in_video_filter;
     filt_out = is->out_video_filter;
 #endif
 
     for (;;) {
-#if !CONFIG_AVFILTER
         AVPacket pkt;
-#else
+#if CONFIG_AVFILTER
         AVFilterBufferRef *picref;
         AVRational tb = filt_out->inputs[0]->time_base;
 #endif
         while (is->paused && !is->videoq.abort_request)
             SDL_Delay(10);
+
+        ret = get_video_frame(is, frame, &pts_int, &pkt);
+        if (ret < 0)
+            goto the_end;
+        av_free_packet(&pkt);
+
+        if (!ret)
+            continue;
+
+        is->frame_last_filter_delay = av_gettime() / 1000000.0 - is->frame_last_returned_time;
+        if (fabs(is->frame_last_filter_delay) > AV_NOSYNC_THRESHOLD / 10.0)
+            is->frame_last_filter_delay = 0;
+
 #if CONFIG_AVFILTER
         if (   last_w != is->video_st->codec->width
             || last_h != is->video_st->codec->height) {
@@ -1862,48 +1694,55 @@ static int video_thread(void *arg)
             last_w = is->video_st->codec->width;
             last_h = is->video_st->codec->height;
         }
-        ret = av_buffersink_get_buffer_ref(filt_out, &picref, 0);
-        if (picref) {
+
+        frame->pts = pts_int;
+        if (is->use_dr1) {
+            FrameBuffer      *buf = frame->opaque;
+            AVFilterBufferRef *fb = avfilter_get_video_buffer_ref_from_arrays(
+                                        frame->data, frame->linesize,
+                                        AV_PERM_READ | AV_PERM_PRESERVE,
+                                        frame->width, frame->height,
+                                        frame->format);
+
+            avfilter_copy_frame_props(fb, frame);
+            fb->buf->priv           = buf;
+            fb->buf->free           = filter_release_buffer;
+
+            buf->refcount++;
+            av_buffersrc_buffer(filt_in, fb);
+
+        } else
+            av_buffersrc_write_frame(filt_in, frame);
+
+        while (ret >= 0) {
+            ret = av_buffersink_get_buffer_ref(filt_out, &picref, 0);
+            if (ret < 0) {
+                ret = 0;
+                break;
+            }
+
             avfilter_fill_frame_from_video_buffer_ref(frame, picref);
+
             pts_int = picref->pts;
             tb      = filt_out->inputs[0]->time_base;
             pos     = picref->pos;
             frame->opaque = picref;
 
-            ret = 1;
-        }
-
-        if (ret >= 0 && av_cmp_q(tb, is->video_st->time_base)) {
-            av_unused int64_t pts1 = pts_int;
-            pts_int = av_rescale_q(pts_int, tb, is->video_st->time_base);
-            av_dlog(NULL, "video_thread(): "
-                    "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",
-                    tb.num, tb.den, pts1,
-                    is->video_st->time_base.num, is->video_st->time_base.den, pts_int);
+            if (av_cmp_q(tb, is->video_st->time_base)) {
+                av_unused int64_t pts1 = pts_int;
+                pts_int = av_rescale_q(pts_int, tb, is->video_st->time_base);
+                av_dlog(NULL, "video_thread(): "
+                        "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",
+                        tb.num, tb.den, pts1,
+                        is->video_st->time_base.num, is->video_st->time_base.den, pts_int);
+            }
+            pts = pts_int * av_q2d(is->video_st->time_base);
+            ret = queue_picture(is, frame, pts, pos);
         }
 #else
-        ret = get_video_frame(is, frame, &pts_int, &pkt);
-        pos = pkt.pos;
-        av_free_packet(&pkt);
-        if (ret == 0)
-            continue;
-#endif
-
-        if (ret < 0)
-            goto the_end;
-
-        is->frame_last_filter_delay = av_gettime() / 1000000.0 - is->frame_last_returned_time;
-        if (fabs(is->frame_last_filter_delay) > AV_NOSYNC_THRESHOLD / 10.0)
-            is->frame_last_filter_delay = 0;
-
-#if CONFIG_AVFILTER
-        if (!picref)
-            continue;
-#endif
-
         pts = pts_int * av_q2d(is->video_st->time_base);
-
-        ret = queue_picture(is, frame, pts, pos);
+        ret = queue_picture(is, frame, pts, pkt.pos);
+#endif
 
         if (ret < 0)
             goto the_end;
@@ -2461,6 +2300,7 @@ static void stream_component_close(VideoState *is, int stream_index)
 
     ic->streams[stream_index]->discard = AVDISCARD_ALL;
     avcodec_close(avctx);
+    free_buffer_pool(&is->buffer_pool);
     switch (avctx->codec_type) {
     case AVMEDIA_TYPE_AUDIO:
         is->audio_st = NULL;
diff --git a/ffprobe.c b/ffprobe.c
index 19b9264335..0e67884301 100644
--- a/ffprobe.c
+++ b/ffprobe.c
@@ -1866,7 +1866,11 @@ static int open_input_file(AVFormatContext **fmt_ctx_ptr, const char *filename)
         AVStream *stream = fmt_ctx->streams[i];
         AVCodec *codec;
 
-        if (!(codec = avcodec_find_decoder(stream->codec->codec_id))) {
+        if (stream->codec->codec_id == CODEC_ID_PROBE) {
+            av_log(NULL, AV_LOG_ERROR,
+                   "Failed to probe codec for input stream %d\n",
+                    stream->index);
+        } else if (!(codec = avcodec_find_decoder(stream->codec->codec_id))) {
             av_log(NULL, AV_LOG_ERROR,
                     "Unsupported codec with id %d for input stream %d\n",
                     stream->codec->codec_id, stream->index);
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index c83b5f52c9..20f330ca57 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -220,6 +220,7 @@ OBJS-$(CONFIG_H264_VAAPI_HWACCEL)      += vaapi_h264.o
 OBJS-$(CONFIG_H264_VDA_HWACCEL)        += vda_h264.o
 OBJS-$(CONFIG_HUFFYUV_DECODER)         += huffyuv.o
 OBJS-$(CONFIG_HUFFYUV_ENCODER)         += huffyuv.o
+OBJS-$(CONFIG_IAC_DECODER)             += imc.o
 OBJS-$(CONFIG_IDCIN_DECODER)           += idcinvideo.o
 OBJS-$(CONFIG_IDF_DECODER)             += bintext.o cga_data.o
 OBJS-$(CONFIG_IFF_BYTERUN1_DECODER)    += iff.o
diff --git a/libavcodec/aacdec.c b/libavcodec/aacdec.c
index b38ed7ed5c..4d4291dc50 100644
--- a/libavcodec/aacdec.c
+++ b/libavcodec/aacdec.c
@@ -487,6 +487,7 @@ static ChannelElement *get_che(AACContext *ac, int type, int elem_id)
             return NULL;
 
         ac->oc[1].m4ac.chan_config = 2;
+        ac->oc[1].m4ac.ps = 0;
     }
     // And vice-versa
     if (!ac->tags_mapped && type == TYPE_SCE && ac->oc[1].m4ac.chan_config == 2) {
@@ -504,6 +505,8 @@ static ChannelElement *get_che(AACContext *ac, int type, int elem_id)
             return NULL;
 
         ac->oc[1].m4ac.chan_config = 1;
+        if (ac->oc[1].m4ac.sbr)
+            ac->oc[1].m4ac.ps = -1;
     }
     // For indexed channel configurations map the channels solely based on position.
     switch (ac->oc[1].m4ac.chan_config) {
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index ac05b9bb55..4067537403 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -286,6 +286,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (G729, g729);
     REGISTER_DECODER (GSM, gsm);
     REGISTER_DECODER (GSM_MS, gsm_ms);
+    REGISTER_DECODER (IAC, iac);
     REGISTER_DECODER (IMC, imc);
     REGISTER_DECODER (MACE3, mace3);
     REGISTER_DECODER (MACE6, mace6);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index e61aabcb72..e2b754f04c 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -406,6 +406,7 @@ enum CodecID {
     CODEC_ID_8SVX_FIB,
     CODEC_ID_BMV_AUDIO,
     CODEC_ID_RALF,
+    CODEC_ID_IAC,
     CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
     CODEC_ID_8SVX_RAW    = MKBETAG('8','S','V','X'),
     CODEC_ID_SONIC       = MKBETAG('S','O','N','C'),
diff --git a/libavcodec/imc.c b/libavcodec/imc.c
index 4c158e6171..1af6bd9c93 100644
--- a/libavcodec/imc.c
+++ b/libavcodec/imc.c
@@ -49,9 +49,7 @@
 #define BANDS 32
 #define COEFFS 256
 
-typedef struct {
-    AVFrame frame;
-
+typedef struct IMCChannel {
     float old_floor[BANDS];
     float flcoeffs1[BANDS];
     float flcoeffs2[BANDS];
@@ -61,16 +59,6 @@ typedef struct {
     float flcoeffs6[BANDS];
     float CWdecoded[COEFFS];
 
-    /** MDCT tables */
-    //@{
-    float mdct_sine_window[COEFFS];
-    float post_cos[COEFFS];
-    float post_sin[COEFFS];
-    float pre_coef1[COEFFS];
-    float pre_coef2[COEFFS];
-    float last_fft_im[COEFFS];
-    //@}
-
     int bandWidthT[BANDS];     ///< codewords per band
     int bitsBandT[BANDS];      ///< how many bits per codeword in band
     int CWlengthT[COEFFS];     ///< how many bits in each codeword
@@ -82,15 +70,37 @@ typedef struct {
     int skipFlagCount[BANDS];  ///< skipped coeffients per band
     int skipFlags[COEFFS];     ///< skip coefficient decoding or not
     int codewords[COEFFS];     ///< raw codewords read from bitstream
+
+    float last_fft_im[COEFFS];
+
+    int decoder_reset;
+} IMCChannel;
+
+typedef struct {
+    AVFrame frame;
+
+    IMCChannel chctx[2];
+
+    /** MDCT tables */
+    //@{
+    float mdct_sine_window[COEFFS];
+    float post_cos[COEFFS];
+    float post_sin[COEFFS];
+    float pre_coef1[COEFFS];
+    float pre_coef2[COEFFS];
+    //@}
+
     float sqrt_tab[30];
     GetBitContext gb;
-    int decoder_reset;
     float one_div_log2;
 
     DSPContext dsp;
     FFTContext fft;
     DECLARE_ALIGNED(32, FFTComplex, samples)[COEFFS / 2];
     float *out_samples;
+
+    int8_t cyclTab[32], cyclTab2[32];
+    float  weights1[31], weights2[31];
 } IMCContext;
 
 static VLC huffman_vlc[4][4];
@@ -110,15 +120,21 @@ static av_cold int imc_decode_init(AVCodecContext *avctx)
     IMCContext *q = avctx->priv_data;
     double r1, r2;
 
-    if (avctx->channels != 1) {
+    if ((avctx->codec_id == CODEC_ID_IMC && avctx->channels != 1)
+        || (avctx->codec_id == CODEC_ID_IAC && avctx->channels > 2)) {
         av_log_ask_for_sample(avctx, "Number of channels is not supported\n");
         return AVERROR_PATCHWELCOME;
     }
 
-    q->decoder_reset = 1;
+    for (j = 0; j < avctx->channels; j++) {
+        q->chctx[j].decoder_reset = 1;
 
-    for (i = 0; i < BANDS; i++)
-        q->old_floor[i] = 1.0;
+        for (i = 0; i < BANDS; i++)
+            q->chctx[j].old_floor[i] = 1.0;
+
+        for (i = 0; i < COEFFS / 2; i++)
+            q->chctx[j].last_fft_im[i] = 0;
+    }
 
     /* Build mdct window, a simple sine window normalized with sqrt(2) */
     ff_sine_window_init(q->mdct_sine_window, COEFFS);
@@ -138,8 +154,6 @@ static av_cold int imc_decode_init(AVCodecContext *avctx)
             q->pre_coef1[i] = -(r1 + r2) * sqrt(2.0);
             q->pre_coef2[i] =  (r1 - r2) * sqrt(2.0);
         }
-
-        q->last_fft_im[i] = 0;
     }
 
     /* Generate a square root table */
@@ -159,13 +173,26 @@ static av_cold int imc_decode_init(AVCodecContext *avctx)
     }
     q->one_div_log2 = 1 / log(2);
 
+    memcpy(q->cyclTab,  cyclTab,  sizeof(cyclTab));
+    memcpy(q->cyclTab2, cyclTab2, sizeof(cyclTab2));
+    if (avctx->codec_id == CODEC_ID_IAC) {
+        q->cyclTab[29]  = 31;
+        q->cyclTab2[31] = 28;
+        memcpy(q->weights1, iac_weights1, sizeof(iac_weights1));
+        memcpy(q->weights2, iac_weights2, sizeof(iac_weights2));
+    } else {
+        memcpy(q->weights1, imc_weights1, sizeof(imc_weights1));
+        memcpy(q->weights2, imc_weights2, sizeof(imc_weights2));
+    }
+
     if ((ret = ff_fft_init(&q->fft, 7, 1))) {
         av_log(avctx, AV_LOG_INFO, "FFT init failed\n");
         return ret;
     }
     ff_dsputil_init(&q->dsp, avctx);
-    avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
-    avctx->channel_layout = AV_CH_LAYOUT_MONO;
+    avctx->sample_fmt     = AV_SAMPLE_FMT_FLT;
+    avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO
+                                                 : AV_CH_LAYOUT_STEREO;
 
     avcodec_get_frame_defaults(&q->frame);
     avctx->coded_frame = &q->frame;
@@ -199,13 +226,13 @@ static void imc_calculate_coeffs(IMCContext *q, float *flcoeffs1,
     }
 
     for (i = 0; i < BANDS; i++) {
-        for (cnt2 = i; cnt2 < cyclTab[i]; cnt2++)
+        for (cnt2 = i; cnt2 < q->cyclTab[i]; cnt2++)
             flcoeffs5[cnt2] = flcoeffs5[cnt2] + workT3[i];
         workT2[cnt2 - 1] = workT2[cnt2 - 1] + workT3[i];
     }
 
     for (i = 1; i < BANDS; i++) {
-        accum = (workT2[i - 1] + accum) * imc_weights1[i - 1];
+        accum = (workT2[i - 1] + accum) * q->weights1[i - 1];
         flcoeffs5[i] += accum;
     }
 
@@ -213,7 +240,7 @@ static void imc_calculate_coeffs(IMCContext *q, float *flcoeffs1,
         workT2[i] = 0.0;
 
     for (i = 0; i < BANDS; i++) {
-        for (cnt2 = i - 1; cnt2 > cyclTab2[i]; cnt2--)
+        for (cnt2 = i - 1; cnt2 > q->cyclTab2[i]; cnt2--)
             flcoeffs5[cnt2] += workT3[i];
         workT2[cnt2+1] += workT3[i];
     }
@@ -221,7 +248,7 @@ static void imc_calculate_coeffs(IMCContext *q, float *flcoeffs1,
     accum = 0.0;
 
     for (i = BANDS-2; i >= 0; i--) {
-        accum = (workT2[i+1] + accum) * imc_weights2[i];
+        accum = (workT2[i+1] + accum) * q->weights2[i];
         flcoeffs5[i] += accum;
         // there is missing code here, but it seems to never be triggered
     }
@@ -313,8 +340,8 @@ static void imc_decode_level_coefficients2(IMCContext *q, int *levlCoeffBuf,
 /**
  * Perform bit allocation depending on bits available
  */
-static int bit_allocation(IMCContext *q, int stream_format_code, int freebits,
-                          int flag)
+static int bit_allocation(IMCContext *q, IMCChannel *chctx,
+                          int stream_format_code, int freebits, int flag)
 {
     int i, j;
     const float limit = -1.e20;
@@ -333,43 +360,43 @@ static int bit_allocation(IMCContext *q, int stream_format_code, int freebits,
     int found_indx = 0;
 
     for (i = 0; i < BANDS; i++)
-        highest = FFMAX(highest, q->flcoeffs1[i]);
+        highest = FFMAX(highest, chctx->flcoeffs1[i]);
 
     for (i = 0; i < BANDS - 1; i++)
-        q->flcoeffs4[i] = q->flcoeffs3[i] - log(q->flcoeffs5[i]) / log(2);
-    q->flcoeffs4[BANDS - 1] = limit;
+        chctx->flcoeffs4[i] = chctx->flcoeffs3[i] - log(chctx->flcoeffs5[i]) / log(2);
+    chctx->flcoeffs4[BANDS - 1] = limit;
 
     highest = highest * 0.25;
 
     for (i = 0; i < BANDS; i++) {
         indx = -1;
-        if ((band_tab[i + 1] - band_tab[i]) == q->bandWidthT[i])
+        if ((band_tab[i + 1] - band_tab[i]) == chctx->bandWidthT[i])
             indx = 0;
 
-        if ((band_tab[i + 1] - band_tab[i]) > q->bandWidthT[i])
+        if ((band_tab[i + 1] - band_tab[i]) > chctx->bandWidthT[i])
             indx = 1;
 
-        if (((band_tab[i + 1] - band_tab[i]) / 2) >= q->bandWidthT[i])
+        if (((band_tab[i + 1] - band_tab[i]) / 2) >= chctx->bandWidthT[i])
             indx = 2;
 
         if (indx == -1)
             return AVERROR_INVALIDDATA;
 
-        q->flcoeffs4[i] += xTab[(indx * 2 + (q->flcoeffs1[i] < highest)) * 2 + flag];
+        chctx->flcoeffs4[i] += xTab[(indx * 2 + (chctx->flcoeffs1[i] < highest)) * 2 + flag];
     }
 
     if (stream_format_code & 0x2) {
-        q->flcoeffs4[0] = limit;
-        q->flcoeffs4[1] = limit;
-        q->flcoeffs4[2] = limit;
-        q->flcoeffs4[3] = limit;
+        chctx->flcoeffs4[0] = limit;
+        chctx->flcoeffs4[1] = limit;
+        chctx->flcoeffs4[2] = limit;
+        chctx->flcoeffs4[3] = limit;
     }
 
     for (i = (stream_format_code & 0x2) ? 4 : 0; i < BANDS - 1; i++) {
-        iacc  += q->bandWidthT[i];
-        summa += q->bandWidthT[i] * q->flcoeffs4[i];
+        iacc  += chctx->bandWidthT[i];
+        summa += chctx->bandWidthT[i] * chctx->flcoeffs4[i];
     }
-    q->bandWidthT[BANDS - 1] = 0;
+    chctx->bandWidthT[BANDS - 1] = 0;
     summa = (summa * 0.5 - freebits) / iacc;
 
 
@@ -382,13 +409,13 @@ static int bit_allocation(IMCContext *q, int stream_format_code, int freebits,
         iacc   = 0;
 
         for (j = (stream_format_code & 0x2) ? 4 : 0; j < BANDS; j++) {
-            cwlen = av_clipf(((q->flcoeffs4[j] * 0.5) - summa + 0.5), 0, 6);
+            cwlen = av_clipf(((chctx->flcoeffs4[j] * 0.5) - summa + 0.5), 0, 6);
 
-            q->bitsBandT[j] = cwlen;
-            summer += q->bandWidthT[j] * cwlen;
+            chctx->bitsBandT[j] = cwlen;
+            summer += chctx->bandWidthT[j] * cwlen;
 
             if (cwlen > 0)
-                iacc += q->bandWidthT[j];
+                iacc += chctx->bandWidthT[j];
         }
 
         flg = t2;
@@ -405,13 +432,13 @@ static int bit_allocation(IMCContext *q, int stream_format_code, int freebits,
 
     for (i = (stream_format_code & 0x2) ? 4 : 0; i < BANDS; i++) {
         for (j = band_tab[i]; j < band_tab[i + 1]; j++)
-            q->CWlengthT[j] = q->bitsBandT[i];
+            chctx->CWlengthT[j] = chctx->bitsBandT[i];
     }
 
     if (freebits > summer) {
         for (i = 0; i < BANDS; i++) {
-            workT[i] = (q->bitsBandT[i] == 6) ? -1.e20
-                                              : (q->bitsBandT[i] * -2 + q->flcoeffs4[i] - 0.415);
+            workT[i] = (chctx->bitsBandT[i] == 6) ? -1.e20
+                                              : (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] - 0.415);
         }
 
         highest = 0.0;
@@ -432,11 +459,11 @@ static int bit_allocation(IMCContext *q, int stream_format_code, int freebits,
 
             if (highest > -1.e20) {
                 workT[found_indx] -= 2.0;
-                if (++q->bitsBandT[found_indx] == 6)
+                if (++chctx->bitsBandT[found_indx] == 6)
                     workT[found_indx] = -1.e20;
 
                 for (j = band_tab[found_indx]; j < band_tab[found_indx + 1] && (freebits > summer); j++) {
-                    q->CWlengthT[j]++;
+                    chctx->CWlengthT[j]++;
                     summer++;
                 }
             }
@@ -444,7 +471,7 @@ static int bit_allocation(IMCContext *q, int stream_format_code, int freebits,
     }
     if (freebits < summer) {
         for (i = 0; i < BANDS; i++) {
-            workT[i] = q->bitsBandT[i] ? (q->bitsBandT[i] * -2 + q->flcoeffs4[i] + 1.585)
+            workT[i] = chctx->bitsBandT[i] ? (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] + 1.585)
                                        : 1.e20;
         }
         if (stream_format_code & 0x2) {
@@ -466,12 +493,12 @@ static int bit_allocation(IMCContext *q, int stream_format_code, int freebits,
             //     break;
             workT[low_indx] = lowest + 2.0;
 
-            if (!--q->bitsBandT[low_indx])
+            if (!--chctx->bitsBandT[low_indx])
                 workT[low_indx] = 1.e20;
 
             for (j = band_tab[low_indx]; j < band_tab[low_indx+1] && (freebits < summer); j++) {
-                if (q->CWlengthT[j] > 0) {
-                    q->CWlengthT[j]--;
+                if (chctx->CWlengthT[j] > 0) {
+                    chctx->CWlengthT[j]--;
                     summer--;
                 }
             }
@@ -480,54 +507,54 @@ static int bit_allocation(IMCContext *q, int stream_format_code, int freebits,
     return 0;
 }
 
-static void imc_get_skip_coeff(IMCContext *q)
+static void imc_get_skip_coeff(IMCContext *q, IMCChannel *chctx)
 {
     int i, j;
 
-    memset(q->skipFlagBits,  0, sizeof(q->skipFlagBits));
-    memset(q->skipFlagCount, 0, sizeof(q->skipFlagCount));
+    memset(chctx->skipFlagBits,  0, sizeof(chctx->skipFlagBits));
+    memset(chctx->skipFlagCount, 0, sizeof(chctx->skipFlagCount));
     for (i = 0; i < BANDS; i++) {
-        if (!q->bandFlagsBuf[i] || !q->bandWidthT[i])
+        if (!chctx->bandFlagsBuf[i] || !chctx->bandWidthT[i])
             continue;
 
-        if (!q->skipFlagRaw[i]) {
-            q->skipFlagBits[i] = band_tab[i + 1] - band_tab[i];
+        if (!chctx->skipFlagRaw[i]) {
+            chctx->skipFlagBits[i] = band_tab[i + 1] - band_tab[i];
 
             for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
-                q->skipFlags[j] = get_bits1(&q->gb);
-                if (q->skipFlags[j])
-                    q->skipFlagCount[i]++;
+                chctx->skipFlags[j] = get_bits1(&q->gb);
+                if (chctx->skipFlags[j])
+                    chctx->skipFlagCount[i]++;
             }
         } else {
             for (j = band_tab[i]; j < band_tab[i + 1] - 1; j += 2) {
                 if (!get_bits1(&q->gb)) { // 0
-                    q->skipFlagBits[i]++;
-                    q->skipFlags[j]      = 1;
-                    q->skipFlags[j + 1]  = 1;
-                    q->skipFlagCount[i] += 2;
+                    chctx->skipFlagBits[i]++;
+                    chctx->skipFlags[j]      = 1;
+                    chctx->skipFlags[j + 1]  = 1;
+                    chctx->skipFlagCount[i] += 2;
                 } else {
                     if (get_bits1(&q->gb)) { // 11
-                        q->skipFlagBits[i] += 2;
-                        q->skipFlags[j]     = 0;
-                        q->skipFlags[j + 1] = 1;
-                        q->skipFlagCount[i]++;
+                        chctx->skipFlagBits[i] += 2;
+                        chctx->skipFlags[j]     = 0;
+                        chctx->skipFlags[j + 1] = 1;
+                        chctx->skipFlagCount[i]++;
                     } else {
-                        q->skipFlagBits[i] += 3;
-                        q->skipFlags[j + 1] = 0;
+                        chctx->skipFlagBits[i] += 3;
+                        chctx->skipFlags[j + 1] = 0;
                         if (!get_bits1(&q->gb)) { // 100
-                            q->skipFlags[j] = 1;
-                            q->skipFlagCount[i]++;
+                            chctx->skipFlags[j] = 1;
+                            chctx->skipFlagCount[i]++;
                         } else { // 101
-                            q->skipFlags[j] = 0;
+                            chctx->skipFlags[j] = 0;
                         }
                     }
                 }
             }
 
             if (j < band_tab[i + 1]) {
-                q->skipFlagBits[i]++;
-                if ((q->skipFlags[j] = get_bits1(&q->gb)))
-                    q->skipFlagCount[i]++;
+                chctx->skipFlagBits[i]++;
+                if ((chctx->skipFlags[j] = get_bits1(&q->gb)))
+                    chctx->skipFlagCount[i]++;
             }
         }
     }
@@ -536,7 +563,8 @@ static void imc_get_skip_coeff(IMCContext *q)
 /**
  * Increase highest' band coefficient sizes as some bits won't be used
  */
-static void imc_adjust_bit_allocation(IMCContext *q, int summer)
+static void imc_adjust_bit_allocation(IMCContext *q, IMCChannel *chctx,
+                                      int summer)
 {
     float workT[32];
     int corrected = 0;
@@ -545,8 +573,8 @@ static void imc_adjust_bit_allocation(IMCContext *q, int summer)
     int found_indx = 0;
 
     for (i = 0; i < BANDS; i++) {
-        workT[i] = (q->bitsBandT[i] == 6) ? -1.e20
-                                          : (q->bitsBandT[i] * -2 + q->flcoeffs4[i] - 0.415);
+        workT[i] = (chctx->bitsBandT[i] == 6) ? -1.e20
+                                          : (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] - 0.415);
     }
 
     while (corrected < summer) {
@@ -564,12 +592,12 @@ static void imc_adjust_bit_allocation(IMCContext *q, int summer)
 
         if (highest > -1.e20) {
             workT[found_indx] -= 2.0;
-            if (++(q->bitsBandT[found_indx]) == 6)
+            if (++(chctx->bitsBandT[found_indx]) == 6)
                 workT[found_indx] = -1.e20;
 
             for (j = band_tab[found_indx]; j < band_tab[found_indx+1] && (corrected < summer); j++) {
-                if (!q->skipFlags[j] && (q->CWlengthT[j] < 6)) {
-                    q->CWlengthT[j]++;
+                if (!chctx->skipFlags[j] && (chctx->CWlengthT[j] < 6)) {
+                    chctx->CWlengthT[j]++;
                     corrected++;
                 }
             }
@@ -577,17 +605,19 @@ static void imc_adjust_bit_allocation(IMCContext *q, int summer)
     }
 }
 
-static void imc_imdct256(IMCContext *q)
+static void imc_imdct256(IMCContext *q, IMCChannel *chctx, int channels)
 {
     int i;
     float re, im;
+    float *dst1 = q->out_samples;
+    float *dst2 = q->out_samples + (COEFFS - 1) * channels;
 
     /* prerotation */
     for (i = 0; i < COEFFS / 2; i++) {
-        q->samples[i].re = -(q->pre_coef1[i] * q->CWdecoded[COEFFS - 1 - i * 2]) -
-                            (q->pre_coef2[i] * q->CWdecoded[i * 2]);
-        q->samples[i].im =  (q->pre_coef2[i] * q->CWdecoded[COEFFS - 1 - i * 2]) -
-                            (q->pre_coef1[i] * q->CWdecoded[i * 2]);
+        q->samples[i].re = -(q->pre_coef1[i] * chctx->CWdecoded[COEFFS - 1 - i * 2]) -
+                            (q->pre_coef2[i] * chctx->CWdecoded[i * 2]);
+        q->samples[i].im =  (q->pre_coef2[i] * chctx->CWdecoded[COEFFS - 1 - i * 2]) -
+                            (q->pre_coef1[i] * chctx->CWdecoded[i * 2]);
     }
 
     /* FFT */
@@ -598,15 +628,18 @@ static void imc_imdct256(IMCContext *q)
     for (i = 0; i < COEFFS / 2; i++) {
         re = ( q->samples[i].re * q->post_cos[i]) + (-q->samples[i].im * q->post_sin[i]);
         im = (-q->samples[i].im * q->post_cos[i]) - ( q->samples[i].re * q->post_sin[i]);
-        q->out_samples[i * 2]              =  (q->mdct_sine_window[COEFFS - 1 - i * 2] * q->last_fft_im[i])
-                                            + (q->mdct_sine_window[i * 2] * re);
-        q->out_samples[COEFFS - 1 - i * 2] =  (q->mdct_sine_window[i * 2] * q->last_fft_im[i])
-                                            - (q->mdct_sine_window[COEFFS - 1 - i * 2] * re);
-        q->last_fft_im[i] = im;
+        *dst1 =  (q->mdct_sine_window[COEFFS - 1 - i * 2] * chctx->last_fft_im[i])
+               + (q->mdct_sine_window[i * 2] * re);
+        *dst2 =  (q->mdct_sine_window[i * 2] * chctx->last_fft_im[i])
+               - (q->mdct_sine_window[COEFFS - 1 - i * 2] * re);
+        dst1 += channels * 2;
+        dst2 -= channels * 2;
+        chctx->last_fft_im[i] = im;
     }
 }
 
-static int inverse_quant_coeff(IMCContext *q, int stream_format_code)
+static int inverse_quant_coeff(IMCContext *q, IMCChannel *chctx,
+                               int stream_format_code)
 {
     int i, j;
     int middle_value, cw_len, max_size;
@@ -614,30 +647,30 @@ static int inverse_quant_coeff(IMCContext *q, int stream_format_code)
 
     for (i = 0; i < BANDS; i++) {
         for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
-            q->CWdecoded[j] = 0;
-            cw_len = q->CWlengthT[j];
+            chctx->CWdecoded[j] = 0;
+            cw_len = chctx->CWlengthT[j];
 
-            if (cw_len <= 0 || q->skipFlags[j])
+            if (cw_len <= 0 || chctx->skipFlags[j])
                 continue;
 
             max_size     = 1 << cw_len;
             middle_value = max_size >> 1;
 
-            if (q->codewords[j] >= max_size || q->codewords[j] < 0)
+            if (chctx->codewords[j] >= max_size || chctx->codewords[j] < 0)
                 return AVERROR_INVALIDDATA;
 
             if (cw_len >= 4) {
                 quantizer = imc_quantizer2[(stream_format_code & 2) >> 1];
-                if (q->codewords[j] >= middle_value)
-                    q->CWdecoded[j] =  quantizer[q->codewords[j] - 8]                * q->flcoeffs6[i];
+                if (chctx->codewords[j] >= middle_value)
+                    chctx->CWdecoded[j] =  quantizer[chctx->codewords[j] - 8]                * chctx->flcoeffs6[i];
                 else
-                    q->CWdecoded[j] = -quantizer[max_size - q->codewords[j] - 8 - 1] * q->flcoeffs6[i];
+                    chctx->CWdecoded[j] = -quantizer[max_size - chctx->codewords[j] - 8 - 1] * chctx->flcoeffs6[i];
             }else{
-                quantizer = imc_quantizer1[((stream_format_code & 2) >> 1) | (q->bandFlagsBuf[i] << 1)];
-                if (q->codewords[j] >= middle_value)
-                    q->CWdecoded[j] =  quantizer[q->codewords[j] - 1]            * q->flcoeffs6[i];
+                quantizer = imc_quantizer1[((stream_format_code & 2) >> 1) | (chctx->bandFlagsBuf[i] << 1)];
+                if (chctx->codewords[j] >= middle_value)
+                    chctx->CWdecoded[j] =  quantizer[chctx->codewords[j] - 1]            * chctx->flcoeffs6[i];
                 else
-                    q->CWdecoded[j] = -quantizer[max_size - 2 - q->codewords[j]] * q->flcoeffs6[i];
+                    chctx->CWdecoded[j] = -quantizer[max_size - 2 - chctx->codewords[j]] * chctx->flcoeffs6[i];
             }
         }
     }
@@ -645,16 +678,16 @@ static int inverse_quant_coeff(IMCContext *q, int stream_format_code)
 }
 
 
-static int imc_get_coeffs(IMCContext *q)
+static int imc_get_coeffs(IMCContext *q, IMCChannel *chctx)
 {
     int i, j, cw_len, cw;
 
     for (i = 0; i < BANDS; i++) {
-        if (!q->sumLenArr[i])
+        if (!chctx->sumLenArr[i])
             continue;
-        if (q->bandFlagsBuf[i] || q->bandWidthT[i]) {
+        if (chctx->bandFlagsBuf[i] || chctx->bandWidthT[i]) {
             for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
-                cw_len = q->CWlengthT[j];
+                cw_len = chctx->CWlengthT[j];
                 cw = 0;
 
                 if (get_bits_count(&q->gb) + cw_len > 512) {
@@ -662,33 +695,195 @@ static int imc_get_coeffs(IMCContext *q)
                     return AVERROR_INVALIDDATA;
                 }
 
-                if (cw_len && (!q->bandFlagsBuf[i] || !q->skipFlags[j]))
+                if (cw_len && (!chctx->bandFlagsBuf[i] || !chctx->skipFlags[j]))
                     cw = get_bits(&q->gb, cw_len);
 
-                q->codewords[j] = cw;
+                chctx->codewords[j] = cw;
             }
         }
     }
     return 0;
 }
 
+static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch)
+{
+    int stream_format_code;
+    int imc_hdr, i, j, ret;
+    int flag;
+    int bits, summer;
+    int counter, bitscount;
+    IMCChannel *chctx = q->chctx + ch;
+
+
+    /* Check the frame header */
+    imc_hdr = get_bits(&q->gb, 9);
+    if (imc_hdr & 0x18) {
+        av_log(avctx, AV_LOG_ERROR, "frame header check failed!\n");
+        av_log(avctx, AV_LOG_ERROR, "got %X.\n", imc_hdr);
+        return AVERROR_INVALIDDATA;
+    }
+    stream_format_code = get_bits(&q->gb, 3);
+
+    if (stream_format_code & 1) {
+        av_log_ask_for_sample(avctx, "Stream format %X is not supported\n",
+                              stream_format_code);
+        return AVERROR_PATCHWELCOME;
+    }
+
+//    av_log(avctx, AV_LOG_DEBUG, "stream_format_code = %d\n", stream_format_code);
+
+    if (stream_format_code & 0x04)
+        chctx->decoder_reset = 1;
+
+    if (chctx->decoder_reset) {
+        memset(q->out_samples, 0, sizeof(q->out_samples));
+        for (i = 0; i < BANDS; i++)
+            chctx->old_floor[i] = 1.0;
+        for (i = 0; i < COEFFS; i++)
+            chctx->CWdecoded[i] = 0;
+        chctx->decoder_reset = 0;
+    }
+
+    flag = get_bits1(&q->gb);
+    imc_read_level_coeffs(q, stream_format_code, chctx->levlCoeffBuf);
+
+    if (stream_format_code & 0x4)
+        imc_decode_level_coefficients(q, chctx->levlCoeffBuf,
+                                      chctx->flcoeffs1, chctx->flcoeffs2);
+    else
+        imc_decode_level_coefficients2(q, chctx->levlCoeffBuf, chctx->old_floor,
+                                       chctx->flcoeffs1, chctx->flcoeffs2);
+
+    memcpy(chctx->old_floor, chctx->flcoeffs1, 32 * sizeof(float));
+
+    counter = 0;
+    for (i = 0; i < BANDS; i++) {
+        if (chctx->levlCoeffBuf[i] == 16) {
+            chctx->bandWidthT[i] = 0;
+            counter++;
+        } else
+            chctx->bandWidthT[i] = band_tab[i + 1] - band_tab[i];
+    }
+    memset(chctx->bandFlagsBuf, 0, BANDS * sizeof(int));
+    for (i = 0; i < BANDS - 1; i++) {
+        if (chctx->bandWidthT[i])
+            chctx->bandFlagsBuf[i] = get_bits1(&q->gb);
+    }
+
+    imc_calculate_coeffs(q, chctx->flcoeffs1, chctx->flcoeffs2, chctx->bandWidthT, chctx->flcoeffs3, chctx->flcoeffs5);
+
+    bitscount = 0;
+    /* first 4 bands will be assigned 5 bits per coefficient */
+    if (stream_format_code & 0x2) {
+        bitscount += 15;
+
+        chctx->bitsBandT[0] = 5;
+        chctx->CWlengthT[0] = 5;
+        chctx->CWlengthT[1] = 5;
+        chctx->CWlengthT[2] = 5;
+        for (i = 1; i < 4; i++) {
+            bits = (chctx->levlCoeffBuf[i] == 16) ? 0 : 5;
+            chctx->bitsBandT[i] = bits;
+            for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
+                chctx->CWlengthT[j] = bits;
+                bitscount      += bits;
+            }
+        }
+    }
+    if (avctx->codec_id == CODEC_ID_IAC) {
+        bitscount += !!chctx->bandWidthT[BANDS - 1];
+        if (!(stream_format_code & 0x2))
+            bitscount += 16;
+    }
+
+    if ((ret = bit_allocation(q, chctx, stream_format_code,
+                              512 - bitscount - get_bits_count(&q->gb),
+                              flag)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Bit allocations failed\n");
+        chctx->decoder_reset = 1;
+        return ret;
+    }
+
+    for (i = 0; i < BANDS; i++) {
+        chctx->sumLenArr[i]   = 0;
+        chctx->skipFlagRaw[i] = 0;
+        for (j = band_tab[i]; j < band_tab[i + 1]; j++)
+            chctx->sumLenArr[i] += chctx->CWlengthT[j];
+        if (chctx->bandFlagsBuf[i])
+            if ((((band_tab[i + 1] - band_tab[i]) * 1.5) > chctx->sumLenArr[i]) && (chctx->sumLenArr[i] > 0))
+                chctx->skipFlagRaw[i] = 1;
+    }
+
+    imc_get_skip_coeff(q, chctx);
+
+    for (i = 0; i < BANDS; i++) {
+        chctx->flcoeffs6[i] = chctx->flcoeffs1[i];
+        /* band has flag set and at least one coded coefficient */
+        if (chctx->bandFlagsBuf[i] && (band_tab[i + 1] - band_tab[i]) != chctx->skipFlagCount[i]) {
+            chctx->flcoeffs6[i] *= q->sqrt_tab[ band_tab[i + 1] - band_tab[i]] /
+                                   q->sqrt_tab[(band_tab[i + 1] - band_tab[i] - chctx->skipFlagCount[i])];
+        }
+    }
+
+    /* calculate bits left, bits needed and adjust bit allocation */
+    bits = summer = 0;
+
+    for (i = 0; i < BANDS; i++) {
+        if (chctx->bandFlagsBuf[i]) {
+            for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
+                if (chctx->skipFlags[j]) {
+                    summer += chctx->CWlengthT[j];
+                    chctx->CWlengthT[j] = 0;
+                }
+            }
+            bits   += chctx->skipFlagBits[i];
+            summer -= chctx->skipFlagBits[i];
+        }
+    }
+    imc_adjust_bit_allocation(q, chctx, summer);
+
+    for (i = 0; i < BANDS; i++) {
+        chctx->sumLenArr[i] = 0;
+
+        for (j = band_tab[i]; j < band_tab[i + 1]; j++)
+            if (!chctx->skipFlags[j])
+                chctx->sumLenArr[i] += chctx->CWlengthT[j];
+    }
+
+    memset(chctx->codewords, 0, sizeof(chctx->codewords));
+
+    if (imc_get_coeffs(q, chctx) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Read coefficients failed\n");
+        chctx->decoder_reset = 1;
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (inverse_quant_coeff(q, chctx, stream_format_code) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Inverse quantization of coefficients failed\n");
+        chctx->decoder_reset = 1;
+        return AVERROR_INVALIDDATA;
+    }
+
+    memset(chctx->skipFlags, 0, sizeof(chctx->skipFlags));
+
+    imc_imdct256(q, chctx, avctx->channels);
+
+    return 0;
+}
+
 static int imc_decode_frame(AVCodecContext *avctx, void *data,
                             int *got_frame_ptr, AVPacket *avpkt)
 {
     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
+    int ret, i;
 
     IMCContext *q = avctx->priv_data;
 
-    int stream_format_code;
-    int imc_hdr, i, j, ret;
-    int flag;
-    int bits, summer;
-    int counter, bitscount;
     LOCAL_ALIGNED_16(uint16_t, buf16, [IMC_BLOCK_SIZE / 2]);
 
-    if (buf_size < IMC_BLOCK_SIZE) {
-        av_log(avctx, AV_LOG_ERROR, "imc frame too small!\n");
+    if (buf_size < IMC_BLOCK_SIZE * avctx->channels) {
+        av_log(avctx, AV_LOG_ERROR, "frame too small!\n");
         return AVERROR_INVALIDDATA;
     }
 
@@ -698,163 +893,36 @@ static int imc_decode_frame(AVCodecContext *avctx, void *data,
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return ret;
     }
-    q->out_samples = (float*)q->frame.data[0];
 
-    q->dsp.bswap16_buf(buf16, (const uint16_t*)buf, IMC_BLOCK_SIZE / 2);
+    for (i = 0; i < avctx->channels; i++) {
+        q->out_samples = (float*)q->frame.data[0] + i;
 
-    init_get_bits(&q->gb, (const uint8_t*)buf16, IMC_BLOCK_SIZE * 8);
+        q->dsp.bswap16_buf(buf16, (const uint16_t*)buf, IMC_BLOCK_SIZE / 2);
 
-    /* Check the frame header */
-    imc_hdr = get_bits(&q->gb, 9);
-    if (imc_hdr != IMC_FRAME_ID) {
-        av_log(avctx, AV_LOG_ERROR, "imc frame header check failed!\n");
-        av_log(avctx, AV_LOG_ERROR, "got %x instead of 0x21.\n", imc_hdr);
-        return AVERROR_INVALIDDATA;
-    }
-    stream_format_code = get_bits(&q->gb, 3);
+        init_get_bits(&q->gb, (const uint8_t*)buf16, IMC_BLOCK_SIZE * 8);
 
-    if (stream_format_code & 1) {
-        av_log(avctx, AV_LOG_ERROR, "Stream code format %X is not supported\n", stream_format_code);
-        return AVERROR_INVALIDDATA;
+        buf += IMC_BLOCK_SIZE;
+
+        if ((ret = imc_decode_block(avctx, q, i)) < 0)
+            return ret;
     }
 
-//    av_log(avctx, AV_LOG_DEBUG, "stream_format_code = %d\n", stream_format_code);
+    if (avctx->channels == 2) {
+        float *src = (float*)q->frame.data[0], t1, t2;
 
-    if (stream_format_code & 0x04)
-        q->decoder_reset = 1;
-
-    if (q->decoder_reset) {
-        memset(q->out_samples, 0, sizeof(q->out_samples));
-        for (i = 0; i < BANDS; i++)
-            q->old_floor[i] = 1.0;
-        for (i = 0; i < COEFFS; i++)
-            q->CWdecoded[i] = 0;
-        q->decoder_reset = 0;
-    }
-
-    flag = get_bits1(&q->gb);
-    imc_read_level_coeffs(q, stream_format_code, q->levlCoeffBuf);
-
-    if (stream_format_code & 0x4)
-        imc_decode_level_coefficients(q, q->levlCoeffBuf,
-                                      q->flcoeffs1, q->flcoeffs2);
-    else
-        imc_decode_level_coefficients2(q, q->levlCoeffBuf, q->old_floor,
-                                       q->flcoeffs1, q->flcoeffs2);
-
-    memcpy(q->old_floor, q->flcoeffs1, 32 * sizeof(float));
-
-    counter = 0;
-    for (i = 0; i < BANDS; i++) {
-        if (q->levlCoeffBuf[i] == 16) {
-            q->bandWidthT[i] = 0;
-            counter++;
-        } else
-            q->bandWidthT[i] = band_tab[i + 1] - band_tab[i];
-    }
-    memset(q->bandFlagsBuf, 0, BANDS * sizeof(int));
-    for (i = 0; i < BANDS - 1; i++) {
-        if (q->bandWidthT[i])
-            q->bandFlagsBuf[i] = get_bits1(&q->gb);
-    }
-
-    imc_calculate_coeffs(q, q->flcoeffs1, q->flcoeffs2, q->bandWidthT, q->flcoeffs3, q->flcoeffs5);
-
-    bitscount = 0;
-    /* first 4 bands will be assigned 5 bits per coefficient */
-    if (stream_format_code & 0x2) {
-        bitscount += 15;
-
-        q->bitsBandT[0] = 5;
-        q->CWlengthT[0] = 5;
-        q->CWlengthT[1] = 5;
-        q->CWlengthT[2] = 5;
-        for (i = 1; i < 4; i++) {
-            bits = (q->levlCoeffBuf[i] == 16) ? 0 : 5;
-            q->bitsBandT[i] = bits;
-            for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
-                q->CWlengthT[j] = bits;
-                bitscount      += bits;
-            }
+        for (i = 0; i < COEFFS; i++) {
+            t1     = src[0];
+            t2     = src[1];
+            src[0] = t1 + t2;
+            src[1] = t1 - t2;
+            src   += 2;
         }
     }
 
-    if ((ret = bit_allocation(q, stream_format_code,
-                              512 - bitscount - get_bits_count(&q->gb),
-                              flag)) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "Bit allocations failed\n");
-        q->decoder_reset = 1;
-        return ret;
-    }
-
-    for (i = 0; i < BANDS; i++) {
-        q->sumLenArr[i]   = 0;
-        q->skipFlagRaw[i] = 0;
-        for (j = band_tab[i]; j < band_tab[i + 1]; j++)
-            q->sumLenArr[i] += q->CWlengthT[j];
-        if (q->bandFlagsBuf[i])
-            if ((((band_tab[i + 1] - band_tab[i]) * 1.5) > q->sumLenArr[i]) && (q->sumLenArr[i] > 0))
-                q->skipFlagRaw[i] = 1;
-    }
-
-    imc_get_skip_coeff(q);
-
-    for (i = 0; i < BANDS; i++) {
-        q->flcoeffs6[i] = q->flcoeffs1[i];
-        /* band has flag set and at least one coded coefficient */
-        if (q->bandFlagsBuf[i] && (band_tab[i + 1] - band_tab[i]) != q->skipFlagCount[i]) {
-            q->flcoeffs6[i] *= q->sqrt_tab[ band_tab[i + 1] - band_tab[i]] /
-                               q->sqrt_tab[(band_tab[i + 1] - band_tab[i] - q->skipFlagCount[i])];
-        }
-    }
-
-    /* calculate bits left, bits needed and adjust bit allocation */
-    bits = summer = 0;
-
-    for (i = 0; i < BANDS; i++) {
-        if (q->bandFlagsBuf[i]) {
-            for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
-                if (q->skipFlags[j]) {
-                    summer += q->CWlengthT[j];
-                    q->CWlengthT[j] = 0;
-                }
-            }
-            bits   += q->skipFlagBits[i];
-            summer -= q->skipFlagBits[i];
-        }
-    }
-    imc_adjust_bit_allocation(q, summer);
-
-    for (i = 0; i < BANDS; i++) {
-        q->sumLenArr[i] = 0;
-
-        for (j = band_tab[i]; j < band_tab[i + 1]; j++)
-            if (!q->skipFlags[j])
-                q->sumLenArr[i] += q->CWlengthT[j];
-    }
-
-    memset(q->codewords, 0, sizeof(q->codewords));
-
-    if (imc_get_coeffs(q) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "Read coefficients failed\n");
-        q->decoder_reset = 1;
-        return AVERROR_INVALIDDATA;
-    }
-
-    if (inverse_quant_coeff(q, stream_format_code) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "Inverse quantization of coefficients failed\n");
-        q->decoder_reset = 1;
-        return AVERROR_INVALIDDATA;
-    }
-
-    memset(q->skipFlags, 0, sizeof(q->skipFlags));
-
-    imc_imdct256(q);
-
     *got_frame_ptr   = 1;
     *(AVFrame *)data = q->frame;
 
-    return IMC_BLOCK_SIZE;
+    return IMC_BLOCK_SIZE * avctx->channels;
 }
 
 
@@ -879,3 +947,15 @@ AVCodec ff_imc_decoder = {
     .capabilities   = CODEC_CAP_DR1,
     .long_name      = NULL_IF_CONFIG_SMALL("IMC (Intel Music Coder)"),
 };
+
+AVCodec ff_iac_decoder = {
+    .name           = "iac",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = CODEC_ID_IAC,
+    .priv_data_size = sizeof(IMCContext),
+    .init           = imc_decode_init,
+    .close          = imc_decode_close,
+    .decode         = imc_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("IAC (Indeo Audio Coder)"),
+};
diff --git a/libavcodec/imcdata.h b/libavcodec/imcdata.h
index 64e7c7185e..7d61a197a6 100644
--- a/libavcodec/imcdata.h
+++ b/libavcodec/imcdata.h
@@ -44,6 +44,25 @@ static const int8_t cyclTab2[32] = {
  12, 13, 14, 15, 16, 17, 17, 18, 19, 20, 21, 22,
 23, 24, 25, 26, 27, 28, 29};
 
+static const float iac_weights1[31] = {
+    0.0538585, 0.0576251, 0.0645592, 0.0494032, 0.0428915, 0.0592188,
+    0.0604145, 0.0673549, 0.0797351, 0.0972911, 0.119376,  0.144777,
+    0.17181,   0.198625,  0.242918,  0.262113,  0.278434,  0.310752,
+    0.319978,  0.328482,  0.354631,  0.380212,  0.388783,  0.400428,
+    0.43096,   0.462397,  0.479469,  0.499329,  0.534526,  0.568631,
+    0.589218
+};
+
+static const float iac_weights2[31] = {
+    0.000375307, 0.000450455, 0.000612191, 0.000297262, 0.000202956,
+    0.000484887, 0.000511777, 0.000686431, 0.00108256,  0.00185267,
+    0.00321869,  0.00541861,  0.00860266,  0.012726,    0.0219151,
+    0.0269104,   0.0316774,   0.0426107,   0.046113,    0.0494974,
+    0.0608692,   0.0734633,   0.0780208,   0.0844921,   0.103034,
+    0.124606,    0.137421,    0.153336,    0.184296,    0.217792,
+    0.239742
+};
+
 static const float imc_weights1[31] = {
     0.119595, 0.123124, 0.129192, 9.97377e-2, 8.1923e-2, 9.61153e-2, 8.77885e-2, 8.61174e-2,
     9.00882e-2, 9.91658e-2, 0.112991, 0.131126, 0.152886, 0.177292, 0.221782, 0.244917, 0.267386,
diff --git a/libavcodec/mpc8.c b/libavcodec/mpc8.c
index 652e824843..9dacc29766 100644
--- a/libavcodec/mpc8.c
+++ b/libavcodec/mpc8.c
@@ -275,7 +275,8 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
         maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
         if(maxband > 32) maxband -= 33;
     }
-    if(maxband >= BANDS) {
+
+    if(maxband > c->maxbands + 1 || maxband >= BANDS) {
         av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
         return AVERROR_INVALIDDATA;
     }
@@ -412,7 +413,8 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
         }
     }
 
-    ff_mpc_dequantize_and_synth(c, maxband, c->frame.data[0], avctx->channels);
+    ff_mpc_dequantize_and_synth(c, maxband - 1, c->frame.data[0],
+                                avctx->channels);
 
     c->cur_frame++;
 
diff --git a/libavcodec/version.h b/libavcodec/version.h
index a9e1f75f30..b3644ba24c 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -27,7 +27,7 @@
  */
 
 #define LIBAVCODEC_VERSION_MAJOR 54
-#define LIBAVCODEC_VERSION_MINOR  24
+#define LIBAVCODEC_VERSION_MINOR  25
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
diff --git a/libavcodec/vorbis.c b/libavcodec/vorbis.c
index fac8d0b2cd..90227dd9f9 100644
--- a/libavcodec/vorbis.c
+++ b/libavcodec/vorbis.c
@@ -123,7 +123,8 @@ int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, unsigned num)
     return 0;
 }
 
-void ff_vorbis_ready_floor1_list(vorbis_floor1_entry * list, int values)
+int ff_vorbis_ready_floor1_list(AVCodecContext *avccontext,
+                                vorbis_floor1_entry *list, int values)
 {
     int i;
     list[0].sort = 0;
@@ -147,6 +148,11 @@ void ff_vorbis_ready_floor1_list(vorbis_floor1_entry * list, int values)
     for (i = 0; i < values - 1; i++) {
         int j;
         for (j = i + 1; j < values; j++) {
+            if (list[i].x == list[j].x) {
+                av_log(avccontext, AV_LOG_ERROR,
+                       "Duplicate value found in floor 1 X coordinates\n");
+                return AVERROR_INVALIDDATA;
+            }
             if (list[list[i].sort].x > list[list[j].sort].x) {
                 int tmp = list[i].sort;
                 list[i].sort = list[j].sort;
@@ -154,6 +160,7 @@ void ff_vorbis_ready_floor1_list(vorbis_floor1_entry * list, int values)
             }
         }
     }
+    return 0;
 }
 
 static inline void render_line_unrolled(intptr_t x, int y, int x1,
diff --git a/libavcodec/vorbis.h b/libavcodec/vorbis.h
index 59afcce766..14045ec53e 100644
--- a/libavcodec/vorbis.h
+++ b/libavcodec/vorbis.h
@@ -36,7 +36,8 @@ typedef struct {
     uint16_t high;
 } vorbis_floor1_entry;
 
-void ff_vorbis_ready_floor1_list(vorbis_floor1_entry * list, int values);
+int ff_vorbis_ready_floor1_list(AVCodecContext *avccontext,
+                                vorbis_floor1_entry *list, int values);
 unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n); // x^(1/n)
 int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, unsigned num);
 void ff_vorbis_floor1_render_list(vorbis_floor1_entry * list, int values,
diff --git a/libavcodec/vorbisdec.c b/libavcodec/vorbisdec.c
index ddc79fcc43..6785105460 100644
--- a/libavcodec/vorbisdec.c
+++ b/libavcodec/vorbisdec.c
@@ -578,14 +578,10 @@ static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
             }
 
 // Precalculate order of x coordinates - needed for decode
-            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
-
-            for (j=1; j<floor_setup->data.t1.x_list_dim; j++) {
-                if (   floor_setup->data.t1.list[ floor_setup->data.t1.list[j-1].sort ].x
-                    == floor_setup->data.t1.list[ floor_setup->data.t1.list[j  ].sort ].x) {
-                    av_log(vc->avccontext, AV_LOG_ERROR, "Non unique x values in floor type 1\n");
-                    return AVERROR_INVALIDDATA;
-                }
+            if (ff_vorbis_ready_floor1_list(vc->avccontext,
+                                            floor_setup->data.t1.list,
+                                            floor_setup->data.t1.x_list_dim)) {
+                return AVERROR_INVALIDDATA;
             }
         } else if (floor_setup->floor_type == 0) {
             unsigned max_codebook_dim = 0;
diff --git a/libavcodec/vorbisenc.c b/libavcodec/vorbisenc.c
index b7d816dc63..7a053c2acc 100644
--- a/libavcodec/vorbisenc.c
+++ b/libavcodec/vorbisenc.c
@@ -340,7 +340,8 @@ static int create_vorbis_context(vorbis_enc_context *venc,
         };
         fc->list[i].x = a[i - 2];
     }
-    ff_vorbis_ready_floor1_list(fc->list, fc->values);
+    if (ff_vorbis_ready_floor1_list(avccontext, fc->list, fc->values))
+        return AVERROR_BUG;
 
     venc->nresidues = 1;
     venc->residues  = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
diff --git a/libavfilter/af_aformat.c b/libavfilter/af_aformat.c
index 35e7db880a..cdd5d12d9c 100644
--- a/libavfilter/af_aformat.c
+++ b/libavfilter/af_aformat.c
@@ -106,8 +106,8 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
     }
 
     PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats,
-                  avfilter_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format");
-    PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, avfilter_add_format,
+                  ff_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format");
+    PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, ff_add_format,
                   get_sample_rate, 0, "sample rate");
     PARSE_FORMATS(s->channel_layouts_str, uint64_t, s->channel_layouts,
                   ff_add_channel_layout, av_get_channel_layout, 0,
@@ -122,8 +122,8 @@ static int query_formats(AVFilterContext *ctx)
 {
     AFormatContext *s = ctx->priv;
 
-    avfilter_set_common_formats(ctx, s->formats ? s->formats :
-                                                  avfilter_all_formats(AVMEDIA_TYPE_AUDIO));
+    ff_set_common_formats(ctx, s->formats ? s->formats :
+                                                  ff_all_formats(AVMEDIA_TYPE_AUDIO));
     ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates :
                                                      ff_all_samplerates());
     ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts :
diff --git a/libavfilter/af_amix.c b/libavfilter/af_amix.c
index d4af9a4234..3fc2e8499a 100644
--- a/libavfilter/af_amix.c
+++ b/libavfilter/af_amix.c
@@ -349,7 +349,7 @@ static int request_samples(AVFilterContext *ctx, int min_samples)
         if (s->input_state[i] == INPUT_OFF)
             continue;
         while (!ret && av_audio_fifo_size(s->fifos[i]) < min_samples)
-            ret = avfilter_request_frame(ctx->inputs[i]);
+            ret = ff_request_frame(ctx->inputs[i]);
         if (ret == AVERROR_EOF) {
             if (av_audio_fifo_size(s->fifos[i]) == 0) {
                 s->input_state[i] = INPUT_OFF;
@@ -410,7 +410,7 @@ static int request_frame(AVFilterLink *outlink)
     }
 
     if (s->frame_list->nb_frames == 0) {
-        ret = avfilter_request_frame(ctx->inputs[0]);
+        ret = ff_request_frame(ctx->inputs[0]);
         if (ret == AVERROR_EOF) {
             s->input_state[0] = INPUT_OFF;
             if (s->nb_inputs == 1)
@@ -497,7 +497,7 @@ static int init(AVFilterContext *ctx, const char *args, void *opaque)
         pad.name           = av_strdup(name);
         pad.filter_samples = filter_samples;
 
-        avfilter_insert_inpad(ctx, i, &pad);
+        ff_insert_inpad(ctx, i, &pad);
     }
 
     return 0;
@@ -525,8 +525,8 @@ static void uninit(AVFilterContext *ctx)
 static int query_formats(AVFilterContext *ctx)
 {
     AVFilterFormats *formats = NULL;
-    avfilter_add_format(&formats, AV_SAMPLE_FMT_FLT);
-    avfilter_set_common_formats(ctx, formats);
+    ff_add_format(&formats, AV_SAMPLE_FMT_FLT);
+    ff_set_common_formats(ctx, formats);
     ff_set_common_channel_layouts(ctx, ff_all_channel_layouts());
     ff_set_common_samplerates(ctx, ff_all_samplerates());
     return 0;
diff --git a/libavfilter/af_asyncts.c b/libavfilter/af_asyncts.c
index adb5347a80..252b32278d 100644
--- a/libavfilter/af_asyncts.c
+++ b/libavfilter/af_asyncts.c
@@ -24,6 +24,7 @@
 
 #include "audio.h"
 #include "avfilter.h"
+#include "internal.h"
 
 typedef struct ASyncContext {
     const AVClass *class;
@@ -116,7 +117,7 @@ static int request_frame(AVFilterLink *link)
 {
     AVFilterContext *ctx = link->src;
     ASyncContext      *s = ctx->priv;
-    int ret = avfilter_request_frame(ctx->inputs[0]);
+    int ret = ff_request_frame(ctx->inputs[0]);
     int nb_samples;
 
     /* flush the fifo */
diff --git a/libavfilter/af_resample.c b/libavfilter/af_resample.c
index 1fc8c04b4a..8a02cfe976 100644
--- a/libavfilter/af_resample.c
+++ b/libavfilter/af_resample.c
@@ -55,18 +55,18 @@ static int query_formats(AVFilterContext *ctx)
     AVFilterLink *inlink  = ctx->inputs[0];
     AVFilterLink *outlink = ctx->outputs[0];
 
-    AVFilterFormats        *in_formats      = avfilter_all_formats(AVMEDIA_TYPE_AUDIO);
-    AVFilterFormats        *out_formats     = avfilter_all_formats(AVMEDIA_TYPE_AUDIO);
+    AVFilterFormats        *in_formats      = ff_all_formats(AVMEDIA_TYPE_AUDIO);
+    AVFilterFormats        *out_formats     = ff_all_formats(AVMEDIA_TYPE_AUDIO);
     AVFilterFormats        *in_samplerates  = ff_all_samplerates();
     AVFilterFormats        *out_samplerates = ff_all_samplerates();
     AVFilterChannelLayouts *in_layouts      = ff_all_channel_layouts();
     AVFilterChannelLayouts *out_layouts     = ff_all_channel_layouts();
 
-    avfilter_formats_ref(in_formats,  &inlink->out_formats);
-    avfilter_formats_ref(out_formats, &outlink->in_formats);
+    ff_formats_ref(in_formats,  &inlink->out_formats);
+    ff_formats_ref(out_formats, &outlink->in_formats);
 
-    avfilter_formats_ref(in_samplerates,  &inlink->out_samplerates);
-    avfilter_formats_ref(out_samplerates, &outlink->in_samplerates);
+    ff_formats_ref(in_samplerates,  &inlink->out_samplerates);
+    ff_formats_ref(out_samplerates, &outlink->in_samplerates);
 
     ff_channel_layouts_ref(in_layouts,  &inlink->out_channel_layouts);
     ff_channel_layouts_ref(out_layouts, &outlink->in_channel_layouts);
@@ -130,7 +130,7 @@ static int request_frame(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     ResampleContext   *s = ctx->priv;
-    int ret = avfilter_request_frame(ctx->inputs[0]);
+    int ret = ff_request_frame(ctx->inputs[0]);
 
     /* flush the lavr delay buffer */
     if (ret == AVERROR_EOF && s->avr) {
diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index 041ba1b9c0..98c35ee00f 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -96,9 +96,9 @@ void ff_command_queue_pop(AVFilterContext *filter)
     av_free(c);
 }
 
-void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
-                         AVFilterPad **pads, AVFilterLink ***links,
-                         AVFilterPad *newpad)
+void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
+                   AVFilterPad **pads, AVFilterLink ***links,
+                   AVFilterPad *newpad)
 {
     unsigned i;
 
@@ -183,14 +183,15 @@ int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
     /* if any information on supported media formats already exists on the
      * link, we need to preserve that */
     if (link->out_formats)
-        avfilter_formats_changeref(&link->out_formats,
+        ff_formats_changeref(&link->out_formats,
                                    &filt->outputs[filt_dstpad_idx]->out_formats);
+
+    if (link->out_samplerates)
+        ff_formats_changeref(&link->out_samplerates,
+                                   &filt->outputs[filt_dstpad_idx]->out_samplerates);
     if (link->out_channel_layouts)
         ff_channel_layouts_changeref(&link->out_channel_layouts,
                                      &filt->outputs[filt_dstpad_idx]->out_channel_layouts);
-    if (link->out_samplerates)
-        avfilter_formats_changeref(&link->out_samplerates,
-                                   &filt->outputs[filt_dstpad_idx]->out_samplerates);
 
     return 0;
 }
@@ -307,18 +308,18 @@ void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
     }
 }
 
-int avfilter_request_frame(AVFilterLink *link)
+int ff_request_frame(AVFilterLink *link)
 {
     FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1);
 
     if (link->srcpad->request_frame)
         return link->srcpad->request_frame(link);
     else if (link->src->inputs[0])
-        return avfilter_request_frame(link->src->inputs[0]);
+        return ff_request_frame(link->src->inputs[0]);
     else return -1;
 }
 
-int avfilter_poll_frame(AVFilterLink *link)
+int ff_poll_frame(AVFilterLink *link)
 {
     int i, min = INT_MAX;
 
@@ -329,7 +330,7 @@ int avfilter_poll_frame(AVFilterLink *link)
         int val;
         if (!link->src->inputs[i])
             return -1;
-        val = avfilter_poll_frame(link->src->inputs[i]);
+        val = ff_poll_frame(link->src->inputs[i]);
         min = FFMIN(min, val);
     }
 
@@ -492,10 +493,10 @@ void avfilter_free(AVFilterContext *filter)
         if ((link = filter->inputs[i])) {
             if (link->src)
                 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
-            avfilter_formats_unref(&link->in_formats);
-            avfilter_formats_unref(&link->out_formats);
-            avfilter_formats_unref(&link->in_samplerates);
-            avfilter_formats_unref(&link->out_samplerates);
+            ff_formats_unref(&link->in_formats);
+            ff_formats_unref(&link->out_formats);
+            ff_formats_unref(&link->in_samplerates);
+            ff_formats_unref(&link->out_samplerates);
             ff_channel_layouts_unref(&link->in_channel_layouts);
             ff_channel_layouts_unref(&link->out_channel_layouts);
         }
@@ -505,10 +506,10 @@ void avfilter_free(AVFilterContext *filter)
         if ((link = filter->outputs[i])) {
             if (link->dst)
                 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
-            avfilter_formats_unref(&link->in_formats);
-            avfilter_formats_unref(&link->out_formats);
-            avfilter_formats_unref(&link->in_samplerates);
-            avfilter_formats_unref(&link->out_samplerates);
+            ff_formats_unref(&link->in_formats);
+            ff_formats_unref(&link->out_formats);
+            ff_formats_unref(&link->in_samplerates);
+            ff_formats_unref(&link->out_samplerates);
             ff_channel_layouts_unref(&link->in_channel_layouts);
             ff_channel_layouts_unref(&link->out_channel_layouts);
         }
@@ -535,3 +536,32 @@ int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque
         ret = filter->filter->init(filter, args, opaque);
     return ret;
 }
+
+#if FF_API_DEFAULT_CONFIG_OUTPUT_LINK
+void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
+                         AVFilterPad **pads, AVFilterLink ***links,
+                         AVFilterPad *newpad)
+{
+    ff_insert_pad(idx, count, padidx_off, pads, links, newpad);
+}
+void avfilter_insert_inpad(AVFilterContext *f, unsigned index,
+                           AVFilterPad *p)
+{
+    ff_insert_pad(index, &f->input_count, offsetof(AVFilterLink, dstpad),
+                  &f->input_pads, &f->inputs, p);
+}
+void avfilter_insert_outpad(AVFilterContext *f, unsigned index,
+                            AVFilterPad *p)
+{
+    ff_insert_pad(index, &f->output_count, offsetof(AVFilterLink, srcpad),
+                  &f->output_pads, &f->outputs, p);
+}
+int avfilter_poll_frame(AVFilterLink *link)
+{
+    return ff_poll_frame(link);
+}
+int avfilter_request_frame(AVFilterLink *link)
+{
+    return ff_request_frame(link);
+}
+#endif
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 10803c54fa..334a1c104f 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -60,6 +60,7 @@ const char *avfilter_license(void);
 typedef struct AVFilterContext AVFilterContext;
 typedef struct AVFilterLink    AVFilterLink;
 typedef struct AVFilterPad     AVFilterPad;
+typedef struct AVFilterFormats AVFilterFormats;
 
 /**
  * A reference-counted buffer data type used by the filter system. Filters
@@ -210,6 +211,7 @@ AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask);
  */
 void avfilter_unref_buffer(AVFilterBufferRef *ref);
 
+#if FF_API_FILTERS_PUBLIC
 /**
  * Remove a reference to a buffer and set the pointer to NULL.
  * If this is the last reference to the buffer, the buffer itself
@@ -258,14 +260,18 @@ void avfilter_unref_bufferp(AVFilterBufferRef **ref);
  * we must ensure that all links which reference either pre-merge format list
  * get updated as well. Therefore, we have the format list structure store a
  * pointer to each of the pointers to itself.
+ * @addtogroup lavfi_deprecated
+ * @deprecated Those functions are only useful inside filters and
+ * user filters are not supported at this point.
+ * @{
  */
-typedef struct AVFilterFormats {
+struct AVFilterFormats {
     unsigned format_count;      ///< number of formats
     int *formats;               ///< list of media formats
 
     unsigned refcount;          ///< number of references to this list
     struct AVFilterFormats ***refs; ///< references to this list
-}  AVFilterFormats;
+};
 
 /**
  * Create a list of supported formats. This is intended for use in
@@ -275,6 +281,7 @@ typedef struct AVFilterFormats {
  *        empty list is created.
  * @return the format list, with no existing references
  */
+attribute_deprecated
 AVFilterFormats *avfilter_make_format_list(const int *fmts);
 
 /**
@@ -284,16 +291,12 @@ AVFilterFormats *avfilter_make_format_list(const int *fmts);
  *
  * @return a non negative value in case of success, or a negative
  * value corresponding to an AVERROR code in case of error
- */
-int avfilter_add_format(AVFilterFormats **avff, int64_t fmt);
-
-#if FF_API_OLD_ALL_FORMATS_API
-/**
  * @deprecated Use avfilter_make_all_formats() instead.
  */
 attribute_deprecated
+int avfilter_add_format(AVFilterFormats **avff, int64_t fmt);
+attribute_deprecated
 AVFilterFormats *avfilter_all_formats(enum AVMediaType type);
-#endif
 
 /**
  * Return a list of all formats supported by FFmpeg for the given media type.
@@ -320,6 +323,7 @@ AVFilterFormats *avfilter_make_all_packing_formats(void);
  * If a and b do not share any common formats, neither is modified, and NULL
  * is returned.
  */
+attribute_deprecated
 AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b);
 
 /**
@@ -334,40 +338,36 @@ AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b);
  *  | |____| |    | |____|
  *  |________|    |________________________
  */
+attribute_deprecated
 void avfilter_formats_ref(AVFilterFormats *formats, AVFilterFormats **ref);
-
-/**
- * If *ref is non-NULL, remove *ref as a reference to the format list
- * it currently points to, deallocates that list if this was the last
- * reference, and sets *ref to NULL.
- *
- *         Before                                 After
- *   ________                               ________         NULL
- *  |formats |<--------.                   |formats |         ^
- *  |  ____  |     ____|________________   |  ____  |     ____|________________
- *  | |refs| |    |  __|_                  | |refs| |    |  __|_
- *  | |* * | |    | |  | |  AVFilterLink   | |* * | |    | |  | |  AVFilterLink
- *  | |* *--------->|*ref|                 | |*   | |    | |*ref|
- *  | |____| |    | |____|                 | |____| |    | |____|
- *  |________|    |_____________________   |________|    |_____________________
- */
+attribute_deprecated
 void avfilter_formats_unref(AVFilterFormats **ref);
-
-/**
- *
- *         Before                                 After
- *   ________                         ________
- *  |formats |<---------.            |formats |<---------.
- *  |  ____  |       ___|___         |  ____  |       ___|___
- *  | |refs| |      |   |   |        | |refs| |      |   |   |   NULL
- *  | |* *--------->|*oldref|        | |* *--------->|*newref|     ^
- *  | |* * | |      |_______|        | |* * | |      |_______|  ___|___
- *  | |____| |                       | |____| |                |   |   |
- *  |________|                       |________|                |*oldref|
- *                                                             |_______|
- */
+attribute_deprecated
 void avfilter_formats_changeref(AVFilterFormats **oldref,
                                 AVFilterFormats **newref);
+/**
+ * Helpers for query_formats() which set all links to the same list of
+ * formats/layouts. If there are no links hooked to this filter, the list
+ * of formats is freed.
+ */
+attribute_deprecated
+void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
+
+attribute_deprecated
+void avfilter_set_common_pixel_formats(AVFilterContext *ctx, AVFilterFormats *formats);
+attribute_deprecated
+void avfilter_set_common_sample_formats(AVFilterContext *ctx, AVFilterFormats *formats);
+attribute_deprecated
+void avfilter_set_common_channel_layouts(AVFilterContext *ctx, AVFilterFormats *formats);
+#if FF_API_PACKING
+attribute_deprecated
+void avfilter_set_common_packing_formats(AVFilterContext *ctx, AVFilterFormats *formats);
+#endif
+
+/**
+ * @}
+ */
+#endif
 
 /**
  * A filter pad used for either input or output.
@@ -523,19 +523,6 @@ attribute_deprecated
 int avfilter_default_query_formats(AVFilterContext *ctx);
 #endif
 
-/**
- * Helpers for query_formats() which set all links to the same list of
- * formats/layouts. If there are no links hooked to this filter, the list
- * of formats is freed.
- */
-void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
-void avfilter_set_common_pixel_formats(AVFilterContext *ctx, AVFilterFormats *formats);
-void avfilter_set_common_sample_formats(AVFilterContext *ctx, AVFilterFormats *formats);
-void avfilter_set_common_channel_layouts(AVFilterContext *ctx, AVFilterFormats *formats);
-#if FF_API_PACKING
-void avfilter_set_common_packing_formats(AVFilterContext *ctx, AVFilterFormats *formats);
-#endif
-
 #if FF_API_FILTERS_PUBLIC
 /** start_frame() handler for filters which simply pass video along */
 attribute_deprecated
@@ -831,6 +818,7 @@ AVFilterBufferRef *avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
                                                              enum AVSampleFormat sample_fmt,
                                                              uint64_t channel_layout);
 
+#if FF_API_FILTERS_PUBLIC
 /**
  * Request an input frame from the filter at the other end of the link.
  *
@@ -842,24 +830,10 @@ AVFilterBufferRef *avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
  */
 int avfilter_request_frame(AVFilterLink *link);
 
-/**
- * Poll a frame from the filter chain.
- *
- * @param  link the input link
- * @return the number of immediately available frames, a negative
- * number in case of error
- */
+attribute_deprecated
 int avfilter_poll_frame(AVFilterLink *link);
 
-/**
- * Notify the next filter of the start of a frame.
- *
- * @param link   the output link the frame will be sent over
- * @param picref A reference to the frame about to be sent. The data for this
- *               frame need only be valid once draw_slice() is called for that
- *               portion. The receiving filter will free this reference when
- *               it no longer needs it.
- */
+attribute_deprecated
 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
 
 /**
@@ -867,24 +841,11 @@ void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
  *
  * @param link the output link the frame was sent over
  */
+attribute_deprecated
 void avfilter_end_frame(AVFilterLink *link);
-
-/**
- * Send a slice to the next filter.
- *
- * Slices have to be provided in sequential order, either in
- * top-bottom or bottom-top order. If slices are provided in
- * non-sequential order the behavior of the function is undefined.
- *
- * @param link the output link over which the frame is being sent
- * @param y    offset in pixels from the top of the image for this slice
- * @param h    height of this slice in pixels
- * @param slice_dir the assumed direction for sending slices,
- *             from the top slice to the bottom slice if the value is 1,
- *             from the bottom slice to the top slice if the value is -1,
- *             for other values the behavior of the function is undefined.
- */
+attribute_deprecated
 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
+#endif
 
 #define AVFILTER_CMD_FLAG_ONE   1 ///< Stop once a filter understood the command (for target=all for example), fast filters are favored automatically
 #define AVFILTER_CMD_FLAG_FAST  2 ///< Only execute command when its fast (like a video out that supports contrast adjustment in hw)
@@ -972,37 +933,18 @@ void avfilter_free(AVFilterContext *filter);
 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
                            unsigned filt_srcpad_idx, unsigned filt_dstpad_idx);
 
-/**
- * Insert a new pad.
- *
- * @param idx Insertion point. Pad is inserted at the end if this point
- *            is beyond the end of the list of pads.
- * @param count Pointer to the number of pads in the list
- * @param padidx_off Offset within an AVFilterLink structure to the element
- *                   to increment when inserting a new pad causes link
- *                   numbering to change
- * @param pads Pointer to the pointer to the beginning of the list of pads
- * @param links Pointer to the pointer to the beginning of the list of links
- * @param newpad The new pad to add. A copy is made when adding.
- */
+#if FF_API_FILTERS_PUBLIC
+attribute_deprecated
 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
                          AVFilterPad **pads, AVFilterLink ***links,
                          AVFilterPad *newpad);
 
-/** Insert a new input pad for the filter. */
-static inline void avfilter_insert_inpad(AVFilterContext *f, unsigned index,
-                                         AVFilterPad *p)
-{
-    avfilter_insert_pad(index, &f->input_count, offsetof(AVFilterLink, dstpad),
-                        &f->input_pads, &f->inputs, p);
-}
-
-/** Insert a new output pad for the filter. */
-static inline void avfilter_insert_outpad(AVFilterContext *f, unsigned index,
-                                          AVFilterPad *p)
-{
-    avfilter_insert_pad(index, &f->output_count, offsetof(AVFilterLink, srcpad),
-                        &f->output_pads, &f->outputs, p);
-}
+attribute_deprecated
+void avfilter_insert_inpad(AVFilterContext *f, unsigned index,
+                           AVFilterPad *p);
+attribute_deprecated
+void avfilter_insert_outpad(AVFilterContext *f, unsigned index,
+                            AVFilterPad *p);
+#endif
 
 #endif /* AVFILTER_AVFILTER_H */
diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index 80715ee7df..09bbe106cf 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -324,7 +324,7 @@ static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
                 continue;
 
             if (link->in_formats != link->out_formats &&
-                !avfilter_merge_formats(link->in_formats,
+                !ff_merge_formats(link->in_formats,
                                         link->out_formats))
                 convert_needed = 1;
             if (link->type == AVMEDIA_TYPE_AUDIO) {
@@ -381,8 +381,8 @@ static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
                 filter_query_formats(convert);
                 inlink  = convert->inputs[0];
                 outlink = convert->outputs[0];
-                if (!avfilter_merge_formats( inlink->in_formats,  inlink->out_formats) ||
-                    !avfilter_merge_formats(outlink->in_formats, outlink->out_formats))
+                if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
+                    !ff_merge_formats(outlink->in_formats, outlink->out_formats))
                     ret |= AVERROR(ENOSYS);
                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
                     (!ff_merge_samplerates(inlink->in_samplerates,
@@ -452,10 +452,10 @@ static int pick_format(AVFilterLink *link, AVFilterLink *ref)
         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
     }
 
-    avfilter_formats_unref(&link->in_formats);
-    avfilter_formats_unref(&link->out_formats);
-    avfilter_formats_unref(&link->in_samplerates);
-    avfilter_formats_unref(&link->out_samplerates);
+    ff_formats_unref(&link->in_formats);
+    ff_formats_unref(&link->out_formats);
+    ff_formats_unref(&link->in_samplerates);
+    ff_formats_unref(&link->out_samplerates);
     ff_channel_layouts_unref(&link->in_channel_layouts);
     ff_channel_layouts_unref(&link->out_channel_layouts);
 
@@ -502,9 +502,9 @@ static int reduce_formats_on_filter(AVFilterContext *filter)
     int i, j, k, ret = 0;
 
     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
-                   format_count, avfilter_add_format);
+                   format_count, ff_add_format);
     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
-                   format_count, avfilter_add_format);
+                   format_count, ff_add_format);
     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
 
diff --git a/libavfilter/buffersink.c b/libavfilter/buffersink.c
index 90ebd93908..bd693baca8 100644
--- a/libavfilter/buffersink.c
+++ b/libavfilter/buffersink.c
@@ -31,6 +31,7 @@
 #include "audio.h"
 #include "avfilter.h"
 #include "buffersink.h"
+#include "internal.h"
 
 typedef struct {
     AVFifoBuffer *fifo;          ///< FIFO buffer of frame references
@@ -102,11 +103,11 @@ int av_buffersink_read(AVFilterContext *ctx, AVFilterBufferRef **buf)
         if (av_fifo_size(sink->fifo))
             return av_fifo_size(sink->fifo)/sizeof(*buf);
         else
-            return avfilter_poll_frame(ctx->inputs[0]);
+            return ff_poll_frame(ctx->inputs[0]);
     }
 
     if (!av_fifo_size(sink->fifo) &&
-        (ret = avfilter_request_frame(link)) < 0)
+        (ret = ff_request_frame(link)) < 0)
         return ret;
 
     if (!av_fifo_size(sink->fifo))
diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
index 0c60caf942..7a392f64f1 100644
--- a/libavfilter/buffersrc.c
+++ b/libavfilter/buffersrc.c
@@ -28,6 +28,7 @@
 #include "buffersrc.h"
 #include "formats.h"
 #include "internal.h"
+#include "video.h"
 #include "vsrc_buffer.h"
 #include "avcodec.h"
 
@@ -328,14 +329,14 @@ static int query_formats(AVFilterContext *ctx)
 
     switch (ctx->outputs[0]->type) {
     case AVMEDIA_TYPE_VIDEO:
-        avfilter_add_format(&formats, c->pix_fmt);
-        avfilter_set_common_formats(ctx, formats);
+        ff_add_format(&formats, c->pix_fmt);
+        ff_set_common_formats(ctx, formats);
         break;
     case AVMEDIA_TYPE_AUDIO:
-        avfilter_add_format(&formats,           c->sample_fmt);
-        avfilter_set_common_formats(ctx, formats);
+        ff_add_format(&formats,           c->sample_fmt);
+        ff_set_common_formats(ctx, formats);
 
-        avfilter_add_format(&samplerates,       c->sample_rate);
+        ff_add_format(&samplerates,       c->sample_rate);
         ff_set_common_samplerates(ctx, samplerates);
 
         ff_add_channel_layout(&channel_layouts, c->channel_layout);
@@ -385,9 +386,9 @@ static int request_frame(AVFilterLink *link)
 
     switch (link->type) {
     case AVMEDIA_TYPE_VIDEO:
-        avfilter_start_frame(link, avfilter_ref_buffer(buf, ~0));
-        avfilter_draw_slice(link, 0, link->h, 1);
-        avfilter_end_frame(link);
+        ff_start_frame(link, avfilter_ref_buffer(buf, ~0));
+        ff_draw_slice(link, 0, link->h, 1);
+        ff_end_frame(link);
         break;
     case AVMEDIA_TYPE_AUDIO:
         ff_filter_samples(link, avfilter_ref_buffer(buf, ~0));
diff --git a/libavfilter/formats.c b/libavfilter/formats.c
index 1fd95eb174..930ed16f5a 100644
--- a/libavfilter/formats.c
+++ b/libavfilter/formats.c
@@ -85,7 +85,7 @@ do {
     MERGE_REF(ret, b, fmts, type, fail);                                        \
 } while (0)
 
-AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
+AVFilterFormats *ff_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
 {
     AVFilterFormats *ret = NULL;
 
@@ -213,7 +213,7 @@ int64_t *ff_copy_int64_list(const int64_t * const list)
         }                                                               \
     }
 
-AVFilterFormats *avfilter_make_format_list(const int *fmts)
+AVFilterFormats *ff_make_format_list(const int *fmts)
 {
     MAKE_FORMAT_LIST(AVFilterFormats, formats, format_count);
     while (count--)
@@ -250,7 +250,7 @@ do {                                                        \
     return 0;                                               \
 } while (0)
 
-int avfilter_add_format(AVFilterFormats **avff, int64_t fmt)
+int ff_add_format(AVFilterFormats **avff, int64_t fmt)
 {
     ADD_FORMAT(avff, fmt, int, formats, format_count);
 }
@@ -260,12 +260,10 @@ int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
     ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
 }
 
-#if FF_API_OLD_ALL_FORMATS_API
-AVFilterFormats *avfilter_all_formats(enum AVMediaType type)
+AVFilterFormats *ff_all_formats(enum AVMediaType type)
 {
     return avfilter_make_all_formats(type);
 }
-#endif
 
 AVFilterFormats *avfilter_make_all_formats(enum AVMediaType type)
 {
@@ -277,7 +275,7 @@ AVFilterFormats *avfilter_make_all_formats(enum AVMediaType type)
     for (fmt = 0; fmt < num_formats; fmt++)
         if ((type != AVMEDIA_TYPE_VIDEO) ||
             (type == AVMEDIA_TYPE_VIDEO && !(av_pix_fmt_descriptors[fmt].flags & PIX_FMT_HWACCEL)))
-            avfilter_add_format(&ret, fmt);
+            ff_add_format(&ret, fmt);
 
     return ret;
 }
@@ -329,7 +327,7 @@ void ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **
     FORMATS_REF(f, ref);
 }
 
-void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
+void ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
 {
     FORMATS_REF(f, ref);
 }
@@ -365,7 +363,7 @@ do {                                                               \
     *ref = NULL;                                                   \
 } while (0)
 
-void avfilter_formats_unref(AVFilterFormats **ref)
+void ff_formats_unref(AVFilterFormats **ref)
 {
     FORMATS_UNREF(ref, formats);
 }
@@ -394,8 +392,7 @@ void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
     FORMATS_CHANGEREF(oldref, newref);
 }
 
-void avfilter_formats_changeref(AVFilterFormats **oldref,
-                                AVFilterFormats **newref)
+void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref)
 {
     FORMATS_CHANGEREF(oldref, newref);
 }
@@ -435,7 +432,7 @@ void ff_set_common_samplerates(AVFilterContext *ctx,
                                AVFilterFormats *samplerates)
 {
     SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
-                       avfilter_formats_ref, formats);
+                       ff_formats_ref, formats);
 }
 
 /**
@@ -443,10 +440,10 @@ void ff_set_common_samplerates(AVFilterContext *ctx,
  * formats. If there are no links hooked to this filter, the list of formats is
  * freed.
  */
-void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
+void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 {
     SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
-                       avfilter_formats_ref, formats);
+                       ff_formats_ref, formats);
 }
 
 int ff_default_query_formats(AVFilterContext *ctx)
@@ -455,7 +452,7 @@ int ff_default_query_formats(AVFilterContext *ctx)
                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
                             AVMEDIA_TYPE_VIDEO;
 
-    avfilter_set_common_formats(ctx, avfilter_all_formats(type));
+    ff_set_common_formats(ctx, ff_all_formats(type));
     if (type == AVMEDIA_TYPE_AUDIO) {
         ff_set_common_channel_layouts(ctx, ff_all_channel_layouts());
         ff_set_common_samplerates(ctx, ff_all_samplerates());
@@ -539,6 +536,39 @@ int avfilter_default_query_formats(AVFilterContext *ctx)
 {
     return ff_default_query_formats(ctx);
 }
+void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
+{
+    ff_set_common_formats(ctx, formats);
+}
+AVFilterFormats *avfilter_make_format_list(const int *fmts)
+{
+    return ff_make_format_list(fmts);
+}
+int avfilter_add_format(AVFilterFormats **avff, int64_t fmt)
+{
+    return ff_add_format(avff, fmt);
+}
+AVFilterFormats *avfilter_all_formats(enum AVMediaType type)
+{
+    return ff_all_formats(type);
+}
+AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
+{
+    return ff_merge_formats(a, b);
+}
+void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
+{
+    ff_formats_ref(f, ref);
+}
+void avfilter_formats_unref(AVFilterFormats **ref)
+{
+    ff_formats_unref(ref);
+}
+void avfilter_formats_changeref(AVFilterFormats **oldref,
+                                AVFilterFormats **newref)
+{
+    ff_formats_changeref(oldref, newref);
+}
 #endif
 #ifdef TEST
 
diff --git a/libavfilter/formats.h b/libavfilter/formats.h
index c7503d649a..7e16733b74 100644
--- a/libavfilter/formats.h
+++ b/libavfilter/formats.h
@@ -21,6 +21,56 @@
 
 #include "avfilter.h"
 
+/**
+ * A list of supported formats for one end of a filter link. This is used
+ * during the format negotiation process to try to pick the best format to
+ * use to minimize the number of necessary conversions. Each filter gives a
+ * list of the formats supported by each input and output pad. The list
+ * given for each pad need not be distinct - they may be references to the
+ * same list of formats, as is often the case when a filter supports multiple
+ * formats, but will always output the same format as it is given in input.
+ *
+ * In this way, a list of possible input formats and a list of possible
+ * output formats are associated with each link. When a set of formats is
+ * negotiated over a link, the input and output lists are merged to form a
+ * new list containing only the common elements of each list. In the case
+ * that there were no common elements, a format conversion is necessary.
+ * Otherwise, the lists are merged, and all other links which reference
+ * either of the format lists involved in the merge are also affected.
+ *
+ * For example, consider the filter chain:
+ * filter (a) --> (b) filter (b) --> (c) filter
+ *
+ * where the letters in parenthesis indicate a list of formats supported on
+ * the input or output of the link. Suppose the lists are as follows:
+ * (a) = {A, B}
+ * (b) = {A, B, C}
+ * (c) = {B, C}
+ *
+ * First, the first link's lists are merged, yielding:
+ * filter (a) --> (a) filter (a) --> (c) filter
+ *
+ * Notice that format list (b) now refers to the same list as filter list (a).
+ * Next, the lists for the second link are merged, yielding:
+ * filter (a) --> (a) filter (a) --> (a) filter
+ *
+ * where (a) = {B}.
+ *
+ * Unfortunately, when the format lists at the two ends of a link are merged,
+ * we must ensure that all links which reference either pre-merge format list
+ * get updated as well. Therefore, we have the format list structure store a
+ * pointer to each of the pointers to itself.
+ */
+#if !FF_API_FILTERS_PUBLIC
+struct AVFilterFormats {
+    unsigned format_count;      ///< number of formats
+    int *formats;               ///< list of media formats
+
+    unsigned refcount;          ///< number of references to this list
+    struct AVFilterFormats ***refs; ///< references to this list
+};
+#endif
+
 typedef struct AVFilterChannelLayouts {
     uint64_t *channel_layouts;  ///< list of channel layouts
     int    nb_channel_layouts;  ///< number of channel layouts
@@ -62,6 +112,13 @@ void ff_set_common_channel_layouts(AVFilterContext *ctx,
 void ff_set_common_samplerates(AVFilterContext *ctx,
                                AVFilterFormats *samplerates);
 
+/**
+ * A helper for query_formats() which sets all links to the same list of
+ * formats. If there are no links hooked to this filter, the list of formats is
+ * freed.
+ */
+void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
+
 int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout);
 
 /**
@@ -80,4 +137,85 @@ void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
 
 int ff_default_query_formats(AVFilterContext *ctx);
 
+
+/**
+ * Create a list of supported formats. This is intended for use in
+ * AVFilter->query_formats().
+ *
+ * @param fmts list of media formats, terminated by -1
+ * @return the format list, with no existing references
+ */
+AVFilterFormats *ff_make_format_list(const int *fmts);
+
+/**
+ * Add fmt to the list of media formats contained in *avff.
+ * If *avff is NULL the function allocates the filter formats struct
+ * and puts its pointer in *avff.
+ *
+ * @return a non negative value in case of success, or a negative
+ * value corresponding to an AVERROR code in case of error
+ */
+int ff_add_format(AVFilterFormats **avff, int64_t fmt);
+
+/**
+ * Return a list of all formats supported by Libav for the given media type.
+ */
+AVFilterFormats *ff_all_formats(enum AVMediaType type);
+
+/**
+ * Return a format list which contains the intersection of the formats of
+ * a and b. Also, all the references of a, all the references of b, and
+ * a and b themselves will be deallocated.
+ *
+ * If a and b do not share any common formats, neither is modified, and NULL
+ * is returned.
+ */
+AVFilterFormats *ff_merge_formats(AVFilterFormats *a, AVFilterFormats *b);
+
+/**
+ * Add *ref as a new reference to formats.
+ * That is the pointers will point like in the ascii art below:
+ *   ________
+ *  |formats |<--------.
+ *  |  ____  |     ____|___________________
+ *  | |refs| |    |  __|_
+ *  | |* * | |    | |  | |  AVFilterLink
+ *  | |* *--------->|*ref|
+ *  | |____| |    | |____|
+ *  |________|    |________________________
+ */
+void ff_formats_ref(AVFilterFormats *formats, AVFilterFormats **ref);
+
+/**
+ * If *ref is non-NULL, remove *ref as a reference to the format list
+ * it currently points to, deallocates that list if this was the last
+ * reference, and sets *ref to NULL.
+ *
+ *         Before                                 After
+ *   ________                               ________         NULL
+ *  |formats |<--------.                   |formats |         ^
+ *  |  ____  |     ____|________________   |  ____  |     ____|________________
+ *  | |refs| |    |  __|_                  | |refs| |    |  __|_
+ *  | |* * | |    | |  | |  AVFilterLink   | |* * | |    | |  | |  AVFilterLink
+ *  | |* *--------->|*ref|                 | |*   | |    | |*ref|
+ *  | |____| |    | |____|                 | |____| |    | |____|
+ *  |________|    |_____________________   |________|    |_____________________
+ */
+void ff_formats_unref(AVFilterFormats **ref);
+
+/**
+ *
+ *         Before                                 After
+ *   ________                         ________
+ *  |formats |<---------.            |formats |<---------.
+ *  |  ____  |       ___|___         |  ____  |       ___|___
+ *  | |refs| |      |   |   |        | |refs| |      |   |   |   NULL
+ *  | |* *--------->|*oldref|        | |* *--------->|*newref|     ^
+ *  | |* * | |      |_______|        | |* * | |      |_______|  ___|___
+ *  | |____| |                       | |____| |                |   |   |
+ *  |________|                       |________|                |*oldref|
+ *                                                             |_______|
+ */
+void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref);
+
 #endif // AVFILTER_FORMATS_H
diff --git a/libavfilter/internal.h b/libavfilter/internal.h
index 0b294d83aa..c208edf229 100644
--- a/libavfilter/internal.h
+++ b/libavfilter/internal.h
@@ -144,4 +144,54 @@ void ff_dlog_ref(void *ctx, AVFilterBufferRef *ref, int end);
 
 void ff_dlog_link(void *ctx, AVFilterLink *link, int end);
 
+/**
+ * Insert a new pad.
+ *
+ * @param idx Insertion point. Pad is inserted at the end if this point
+ *            is beyond the end of the list of pads.
+ * @param count Pointer to the number of pads in the list
+ * @param padidx_off Offset within an AVFilterLink structure to the element
+ *                   to increment when inserting a new pad causes link
+ *                   numbering to change
+ * @param pads Pointer to the pointer to the beginning of the list of pads
+ * @param links Pointer to the pointer to the beginning of the list of links
+ * @param newpad The new pad to add. A copy is made when adding.
+ */
+void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
+                   AVFilterPad **pads, AVFilterLink ***links,
+                   AVFilterPad *newpad);
+
+/** Insert a new input pad for the filter. */
+static inline void ff_insert_inpad(AVFilterContext *f, unsigned index,
+                                   AVFilterPad *p)
+{
+    ff_insert_pad(index, &f->input_count, offsetof(AVFilterLink, dstpad),
+                  &f->input_pads, &f->inputs, p);
+}
+
+/** Insert a new output pad for the filter. */
+static inline void ff_insert_outpad(AVFilterContext *f, unsigned index,
+                                    AVFilterPad *p)
+{
+    ff_insert_pad(index, &f->output_count, offsetof(AVFilterLink, srcpad),
+                  &f->output_pads, &f->outputs, p);
+}
+
+/**
+ * Poll a frame from the filter chain.
+ *
+ * @param  link the input link
+ * @return the number of immediately available frames, a negative
+ * number in case of error
+ */
+int ff_poll_frame(AVFilterLink *link);
+
+/**
+ * Request an input frame from the filter at the other end of the link.
+ *
+ * @param link the input link
+ * @return     zero on success
+ */
+int ff_request_frame(AVFilterLink *link);
+
 #endif /* AVFILTER_INTERNAL_H */
diff --git a/libavfilter/split.c b/libavfilter/split.c
index 97e5265a30..b7d8b87e68 100644
--- a/libavfilter/split.c
+++ b/libavfilter/split.c
@@ -25,6 +25,7 @@
 
 #include "avfilter.h"
 #include "audio.h"
+#include "internal.h"
 #include "video.h"
 
 static int split_init(AVFilterContext *ctx, const char *args, void *opaque)
@@ -48,7 +49,7 @@ static int split_init(AVFilterContext *ctx, const char *args, void *opaque)
         pad.type = ctx->filter->inputs[0].type;
         pad.name = av_strdup(name);
 
-        avfilter_insert_outpad(ctx, i, &pad);
+        ff_insert_outpad(ctx, i, &pad);
     }
 
     return 0;
@@ -68,8 +69,8 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
     int i;
 
     for (i = 0; i < ctx->output_count; i++)
-        avfilter_start_frame(ctx->outputs[i],
-                             avfilter_ref_buffer(picref, ~AV_PERM_WRITE));
+        ff_start_frame(ctx->outputs[i],
+                       avfilter_ref_buffer(picref, ~AV_PERM_WRITE));
 }
 
 static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
@@ -78,7 +79,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
     int i;
 
     for (i = 0; i < ctx->output_count; i++)
-        avfilter_draw_slice(ctx->outputs[i], y, h, slice_dir);
+        ff_draw_slice(ctx->outputs[i], y, h, slice_dir);
 }
 
 static void end_frame(AVFilterLink *inlink)
@@ -87,7 +88,7 @@ static void end_frame(AVFilterLink *inlink)
     int i;
 
     for (i = 0; i < ctx->output_count; i++)
-        avfilter_end_frame(ctx->outputs[i]);
+        ff_end_frame(ctx->outputs[i]);
 
     avfilter_unref_buffer(inlink->cur_buf);
 }
diff --git a/libavfilter/src_movie.c b/libavfilter/src_movie.c
index ca73ad064a..354d67c941 100644
--- a/libavfilter/src_movie.c
+++ b/libavfilter/src_movie.c
@@ -39,6 +39,7 @@
 #include "avcodec.h"
 #include "avfilter.h"
 #include "formats.h"
+#include "video.h"
 
 typedef struct {
     /* common A/V fields */
@@ -219,7 +220,7 @@ static int movie_query_formats(AVFilterContext *ctx)
     MovieContext *movie = ctx->priv;
     enum PixelFormat pix_fmts[] = { movie->codec_ctx->pix_fmt, PIX_FMT_NONE };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -318,9 +319,9 @@ static int movie_request_frame(AVFilterLink *outlink)
         return ret;
 
     outpicref = avfilter_ref_buffer(movie->picref, ~0);
-    avfilter_start_frame(outlink, outpicref);
-    avfilter_draw_slice(outlink, 0, outlink->h, 1);
-    avfilter_end_frame(outlink);
+    ff_start_frame(outlink, outpicref);
+    ff_draw_slice(outlink, 0, outlink->h, 1);
+    ff_end_frame(outlink);
     avfilter_unref_buffer(movie->picref);
     movie->picref = NULL;
 
diff --git a/libavfilter/vf_aspect.c b/libavfilter/vf_aspect.c
index 685c96f2d2..179ef292b7 100644
--- a/libavfilter/vf_aspect.c
+++ b/libavfilter/vf_aspect.c
@@ -55,7 +55,7 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
     AspectContext *aspect = link->dst->priv;
 
     picref->video->sample_aspect_ratio = aspect->ratio;
-    avfilter_start_frame(link->dst->outputs[0], picref);
+    ff_start_frame(link->dst->outputs[0], picref);
 }
 
 #if CONFIG_SETDAR_FILTER
diff --git a/libavfilter/vf_blackframe.c b/libavfilter/vf_blackframe.c
index c54a8e1b45..4a415b0e38 100644
--- a/libavfilter/vf_blackframe.c
+++ b/libavfilter/vf_blackframe.c
@@ -29,6 +29,7 @@
 
 #include "avfilter.h"
 #include "internal.h"
+#include "formats.h"
 #include "video.h"
 
 typedef struct {
@@ -47,7 +48,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -89,7 +90,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         p += picref->linesize[0];
     }
 
-    avfilter_draw_slice(ctx->outputs[0], y, h, slice_dir);
+    ff_draw_slice(ctx->outputs[0], y, h, slice_dir);
 }
 
 static void end_frame(AVFilterLink *inlink)
@@ -113,7 +114,7 @@ static void end_frame(AVFilterLink *inlink)
     blackframe->frame++;
     blackframe->nblack = 0;
     avfilter_unref_buffer(picref);
-    avfilter_end_frame(inlink->dst->outputs[0]);
+    ff_end_frame(inlink->dst->outputs[0]);
 }
 
 AVFilter avfilter_vf_blackframe = {
diff --git a/libavfilter/vf_boxblur.c b/libavfilter/vf_boxblur.c
index 60c9be9a0b..d8aa764d9a 100644
--- a/libavfilter/vf_boxblur.c
+++ b/libavfilter/vf_boxblur.c
@@ -29,6 +29,8 @@
 #include "libavutil/eval.h"
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
+#include "formats.h"
+#include "video.h"
 
 static const char *const var_names[] = {
     "w",
@@ -129,7 +131,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -324,7 +326,7 @@ static void end_frame(AVFilterLink *inlink)
               w[plane], h[plane], boxblur->radius[plane], boxblur->power[plane],
               boxblur->temp);
 
-    avfilter_draw_slice(outlink, 0, inlink->h, 1);
+    ff_draw_slice(outlink, 0, inlink->h, 1);
     avfilter_default_end_frame(inlink);
 }
 
diff --git a/libavfilter/vf_crop.c b/libavfilter/vf_crop.c
index b8cfd440aa..48af9c8127 100644
--- a/libavfilter/vf_crop.c
+++ b/libavfilter/vf_crop.c
@@ -26,6 +26,7 @@
 /* #define DEBUG */
 
 #include "avfilter.h"
+#include "formats.h"
 #include "video.h"
 #include "libavutil/eval.h"
 #include "libavutil/avstring.h"
@@ -113,7 +114,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
 
     return 0;
 }
@@ -308,7 +309,7 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
         ref2->data[3] += crop->x * crop->max_step[3];
     }
 
-    avfilter_start_frame(link->dst->outputs[0], ref2);
+    ff_start_frame(link->dst->outputs[0], ref2);
 }
 
 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
@@ -326,7 +327,7 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
     if (y + h > crop->y + crop->h)
         h = crop->y + crop->h - y;
 
-    avfilter_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
+    ff_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
 }
 
 static void end_frame(AVFilterLink *link)
@@ -335,7 +336,7 @@ static void end_frame(AVFilterLink *link)
 
     crop->var_values[VAR_N] += 1.0;
     avfilter_unref_buffer(link->cur_buf);
-    avfilter_end_frame(link->dst->outputs[0]);
+    ff_end_frame(link->dst->outputs[0]);
 }
 
 AVFilter avfilter_vf_crop = {
diff --git a/libavfilter/vf_cropdetect.c b/libavfilter/vf_cropdetect.c
index 19e6e8d375..ed5d04eea8 100644
--- a/libavfilter/vf_cropdetect.c
+++ b/libavfilter/vf_cropdetect.c
@@ -25,6 +25,7 @@
 
 #include "libavutil/imgutils.h"
 #include "avfilter.h"
+#include "formats.h"
 #include "video.h"
 
 typedef struct {
@@ -47,7 +48,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -189,7 +190,7 @@ static void end_frame(AVFilterLink *inlink)
                w, h, x, y);
     }
 
-    avfilter_end_frame(inlink->dst->outputs[0]);
+    ff_end_frame(inlink->dst->outputs[0]);
 }
 
 AVFilter avfilter_vf_cropdetect = {
diff --git a/libavfilter/vf_delogo.c b/libavfilter/vf_delogo.c
index a9ba442699..2949d7e931 100644
--- a/libavfilter/vf_delogo.c
+++ b/libavfilter/vf_delogo.c
@@ -29,6 +29,7 @@
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
+#include "formats.h"
 #include "video.h"
 
 /**
@@ -164,7 +165,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -226,7 +227,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
         outpicref = inpicref;
 
     outlink->out_buf = outpicref;
-    avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
+    ff_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
 }
 
 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
@@ -255,8 +256,8 @@ static void end_frame(AVFilterLink *inlink)
                      delogo->show, direct);
     }
 
-    avfilter_draw_slice(outlink, 0, inlink->h, 1);
-    avfilter_end_frame(outlink);
+    ff_draw_slice(outlink, 0, inlink->h, 1);
+    ff_end_frame(outlink);
     avfilter_unref_buffer(inpicref);
     if (!direct)
         avfilter_unref_buffer(outpicref);
diff --git a/libavfilter/vf_drawbox.c b/libavfilter/vf_drawbox.c
index c23406ad0a..c792faf5b4 100644
--- a/libavfilter/vf_drawbox.c
+++ b/libavfilter/vf_drawbox.c
@@ -28,6 +28,7 @@
 #include "libavutil/pixdesc.h"
 #include "libavutil/parseutils.h"
 #include "avfilter.h"
+#include "formats.h"
 #include "video.h"
 
 enum { Y, U, V, A };
@@ -71,7 +72,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -118,7 +119,7 @@ static void draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
         }
     }
 
-    avfilter_draw_slice(inlink->dst->outputs[0], y0, h, 1);
+    ff_draw_slice(inlink->dst->outputs[0], y0, h, 1);
 }
 
 AVFilter avfilter_vf_drawbox = {
diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
index 18fd7d832c..ce290edb69 100644
--- a/libavfilter/vf_drawtext.c
+++ b/libavfilter/vf_drawtext.c
@@ -41,6 +41,7 @@
 #include "libavutil/lfg.h"
 #include "avfilter.h"
 #include "drawutils.h"
+#include "formats.h"
 #include "video.h"
 
 #undef time
@@ -492,7 +493,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
 
 static int query_formats(AVFilterContext *ctx)
 {
-    avfilter_set_common_pixel_formats(ctx, ff_draw_supported_pixel_formats(0));
+    ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
     return 0;
 }
 
@@ -812,8 +813,8 @@ static void end_frame(AVFilterLink *inlink)
 
     dtext->var_values[VAR_N] += 1.0;
 
-    avfilter_draw_slice(outlink, 0, picref->video->h, 1);
-    avfilter_end_frame(outlink);
+    ff_draw_slice(outlink, 0, picref->video->h, 1);
+    ff_end_frame(outlink);
 }
 
 AVFilter avfilter_vf_drawtext = {
diff --git a/libavfilter/vf_fade.c b/libavfilter/vf_fade.c
index d4303d0b0c..8ff5af9f3b 100644
--- a/libavfilter/vf_fade.c
+++ b/libavfilter/vf_fade.c
@@ -32,6 +32,7 @@
 #include "avfilter.h"
 #include "drawutils.h"
 #include "internal.h"
+#include "formats.h"
 #include "video.h"
 
 #define R 0
@@ -158,7 +159,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -257,14 +258,14 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         }
     }
 
-    avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
+    ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
 }
 
 static void end_frame(AVFilterLink *inlink)
 {
     FadeContext *fade = inlink->dst->priv;
 
-    avfilter_end_frame(inlink->dst->outputs[0]);
+    ff_end_frame(inlink->dst->outputs[0]);
 
     if (fade->frame_index >= fade->start_frame &&
         fade->frame_index <= fade->stop_frame)
diff --git a/libavfilter/vf_fieldorder.c b/libavfilter/vf_fieldorder.c
index 88abe54c5a..24c23e219e 100644
--- a/libavfilter/vf_fieldorder.c
+++ b/libavfilter/vf_fieldorder.c
@@ -28,6 +28,8 @@
 #include "libavutil/imgutils.h"
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
+#include "formats.h"
+#include "video.h"
 
 typedef struct
 {
@@ -76,12 +78,12 @@ static int query_formats(AVFilterContext *ctx)
                  || av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_BITSTREAM)
                 && av_pix_fmt_descriptors[pix_fmt].nb_components
                 && !av_pix_fmt_descriptors[pix_fmt].log2_chroma_h
-                && (ret = avfilter_add_format(&formats, pix_fmt)) < 0) {
-                avfilter_formats_unref(&formats);
+                && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
+                ff_formats_unref(&formats);
                 return ret;
             }
-        avfilter_formats_ref(formats, &ctx->inputs[0]->out_formats);
-        avfilter_formats_ref(formats, &ctx->outputs[0]->in_formats);
+        ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
+        ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
     }
 
     return 0;
@@ -123,7 +125,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
     outpicref = avfilter_ref_buffer(inpicref, ~0);
     outlink->out_buf = outpicref;
 
-    avfilter_start_frame(outlink, outpicref);
+    ff_start_frame(outlink, outpicref);
 }
 
 static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
@@ -140,7 +142,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
      *  and that complexity will be added later */
     if (  !inpicref->video->interlaced
         || inpicref->video->top_field_first == fieldorder->dst_tff) {
-        avfilter_draw_slice(outlink, y, h, slice_dir);
+        ff_draw_slice(outlink, y, h, slice_dir);
     }
 }
 
@@ -202,13 +204,13 @@ static void end_frame(AVFilterLink *inlink)
             }
         }
         outpicref->video->top_field_first = fieldorder->dst_tff;
-        avfilter_draw_slice(outlink, 0, h, 1);
+        ff_draw_slice(outlink, 0, h, 1);
     } else {
         av_dlog(ctx,
                 "not interlaced or field order already correct\n");
     }
 
-    avfilter_end_frame(outlink);
+    ff_end_frame(outlink);
     avfilter_unref_buffer(inpicref);
 }
 
diff --git a/libavfilter/vf_fifo.c b/libavfilter/vf_fifo.c
index 91e4b9d111..d9200d770a 100644
--- a/libavfilter/vf_fifo.c
+++ b/libavfilter/vf_fifo.c
@@ -24,6 +24,7 @@
  */
 
 #include "avfilter.h"
+#include "internal.h"
 #include "video.h"
 
 typedef struct BufPic {
@@ -83,9 +84,9 @@ static int request_frame(AVFilterLink *outlink)
 
     /* by doing this, we give ownership of the reference to the next filter,
      * so we don't have to worry about dereferencing it ourselves. */
-    avfilter_start_frame(outlink, fifo->root.next->picref);
-    avfilter_draw_slice (outlink, 0, outlink->h, 1);
-    avfilter_end_frame  (outlink);
+    ff_start_frame(outlink, fifo->root.next->picref);
+    ff_draw_slice (outlink, 0, outlink->h, 1);
+    ff_end_frame  (outlink);
 
     if (fifo->last == fifo->root.next)
         fifo->last = &fifo->root;
diff --git a/libavfilter/vf_format.c b/libavfilter/vf_format.c
index d8b3a40a7d..665ec2f423 100644
--- a/libavfilter/vf_format.c
+++ b/libavfilter/vf_format.c
@@ -26,6 +26,7 @@
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
 #include "internal.h"
+#include "formats.h"
 #include "video.h"
 
 typedef struct {
@@ -87,7 +88,7 @@ static AVFilterFormats *make_format_list(FormatContext *format, int flag)
 #if CONFIG_FORMAT_FILTER
 static int query_formats_format(AVFilterContext *ctx)
 {
-    avfilter_set_common_pixel_formats(ctx, make_format_list(ctx->priv, 1));
+    ff_set_common_formats(ctx, make_format_list(ctx->priv, 1));
     return 0;
 }
 
@@ -117,7 +118,7 @@ AVFilter avfilter_vf_format = {
 #if CONFIG_NOFORMAT_FILTER
 static int query_formats_noformat(AVFilterContext *ctx)
 {
-    avfilter_set_common_pixel_formats(ctx, make_format_list(ctx->priv, 0));
+    ff_set_common_formats(ctx, make_format_list(ctx->priv, 0));
     return 0;
 }
 
diff --git a/libavfilter/vf_fps.c b/libavfilter/vf_fps.c
index d12070c49a..bbe1bdd6ea 100644
--- a/libavfilter/vf_fps.c
+++ b/libavfilter/vf_fps.c
@@ -31,6 +31,8 @@
 #include "libavutil/parseutils.h"
 
 #include "avfilter.h"
+#include "internal.h"
+#include "video.h"
 
 typedef struct FPSContext {
     const AVClass *class;
@@ -133,7 +135,7 @@ static int request_frame(AVFilterLink *outlink)
     int ret = 0;
 
     while (ret >= 0 && s->frames_out == frames_out)
-        ret = avfilter_request_frame(ctx->inputs[0]);
+        ret = ff_request_frame(ctx->inputs[0]);
 
     /* flush the fifo */
     if (ret == AVERROR_EOF && av_fifo_size(s->fifo)) {
@@ -145,9 +147,9 @@ static int request_frame(AVFilterLink *outlink)
             buf->pts = av_rescale_q(s->first_pts, ctx->inputs[0]->time_base,
                                     outlink->time_base) + s->frames_out;
 
-            avfilter_start_frame(outlink, buf);
-            avfilter_draw_slice(outlink, 0, outlink->h, 1);
-            avfilter_end_frame(outlink);
+            ff_start_frame(outlink, buf);
+            ff_draw_slice(outlink, 0, outlink->h, 1);
+            ff_end_frame(outlink);
             s->frames_out++;
         }
         return 0;
@@ -233,9 +235,9 @@ static void end_frame(AVFilterLink *inlink)
         buf_out->pts = av_rescale_q(s->first_pts, inlink->time_base,
                                     outlink->time_base) + s->frames_out;
 
-        avfilter_start_frame(outlink, buf_out);
-        avfilter_draw_slice(outlink, 0, outlink->h, 1);
-        avfilter_end_frame(outlink);
+        ff_start_frame(outlink, buf_out);
+        ff_draw_slice(outlink, 0, outlink->h, 1);
+        ff_end_frame(outlink);
         s->frames_out++;
     }
     flush_fifo(s->fifo);
diff --git a/libavfilter/vf_frei0r.c b/libavfilter/vf_frei0r.c
index a77cedf59c..e3dbf06e45 100644
--- a/libavfilter/vf_frei0r.c
+++ b/libavfilter/vf_frei0r.c
@@ -31,6 +31,8 @@
 #include "libavutil/mathematics.h"
 #include "libavutil/parseutils.h"
 #include "avfilter.h"
+#include "formats.h"
+#include "video.h"
 
 typedef f0r_instance_t (*f0r_construct_f)(unsigned int width, unsigned int height);
 typedef void (*f0r_destruct_f)(f0r_instance_t instance);
@@ -320,20 +322,20 @@ static int query_formats(AVFilterContext *ctx)
     AVFilterFormats *formats = NULL;
 
     if        (frei0r->plugin_info.color_model == F0R_COLOR_MODEL_BGRA8888) {
-        avfilter_add_format(&formats, PIX_FMT_BGRA);
+        ff_add_format(&formats, PIX_FMT_BGRA);
     } else if (frei0r->plugin_info.color_model == F0R_COLOR_MODEL_RGBA8888) {
-        avfilter_add_format(&formats, PIX_FMT_RGBA);
+        ff_add_format(&formats, PIX_FMT_RGBA);
     } else {                                   /* F0R_COLOR_MODEL_PACKED32 */
         static const enum PixelFormat pix_fmts[] = {
             PIX_FMT_BGRA, PIX_FMT_ARGB, PIX_FMT_ABGR, PIX_FMT_ARGB, PIX_FMT_NONE
         };
-        formats = avfilter_make_format_list(pix_fmts);
+        formats = ff_make_format_list(pix_fmts);
     }
 
     if (!formats)
         return AVERROR(ENOMEM);
 
-    avfilter_set_common_pixel_formats(ctx, formats);
+    ff_set_common_formats(ctx, formats);
     return 0;
 }
 
@@ -350,8 +352,8 @@ static void end_frame(AVFilterLink *inlink)
                    (const uint32_t *)inpicref->data[0],
                    (uint32_t *)outpicref->data[0]);
     avfilter_unref_buffer(inpicref);
-    avfilter_draw_slice(outlink, 0, outlink->h, 1);
-    avfilter_end_frame(outlink);
+    ff_draw_slice(outlink, 0, outlink->h, 1);
+    ff_end_frame(outlink);
     avfilter_unref_buffer(outpicref);
 }
 
@@ -436,11 +438,11 @@ static int source_request_frame(AVFilterLink *outlink)
     picref->pts = frei0r->pts++;
     picref->pos = -1;
 
-    avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
+    ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
     frei0r->update(frei0r->instance, av_rescale_q(picref->pts, frei0r->time_base, (AVRational){1,1000}),
                    NULL, (uint32_t *)picref->data[0]);
-    avfilter_draw_slice(outlink, 0, outlink->h, 1);
-    avfilter_end_frame(outlink);
+    ff_draw_slice(outlink, 0, outlink->h, 1);
+    ff_end_frame(outlink);
     avfilter_unref_buffer(picref);
 
     return 0;
diff --git a/libavfilter/vf_gradfun.c b/libavfilter/vf_gradfun.c
index 49e525507f..1b3a32933d 100644
--- a/libavfilter/vf_gradfun.c
+++ b/libavfilter/vf_gradfun.c
@@ -36,7 +36,9 @@
 #include "libavutil/cpu.h"
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
+#include "formats.h"
 #include "gradfun.h"
+#include "video.h"
 
 DECLARE_ALIGNED(16, static const uint16_t, dither)[8][8] = {
     {0x00,0x60,0x18,0x78,0x06,0x66,0x1E,0x7E},
@@ -160,7 +162,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
 
     return 0;
 }
@@ -196,7 +198,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
         outpicref = inpicref;
 
     outlink->out_buf = outpicref;
-    avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
+    ff_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
 }
 
 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
@@ -225,8 +227,8 @@ static void end_frame(AVFilterLink *inlink)
             av_image_copy_plane(outpic->data[p], outpic->linesize[p], inpic->data[p], inpic->linesize[p], w, h);
     }
 
-    avfilter_draw_slice(outlink, 0, inlink->h, 1);
-    avfilter_end_frame(outlink);
+    ff_draw_slice(outlink, 0, inlink->h, 1);
+    ff_end_frame(outlink);
     avfilter_unref_buffer(inpic);
     if (outpic != inpic)
         avfilter_unref_buffer(outpic);
diff --git a/libavfilter/vf_hflip.c b/libavfilter/vf_hflip.c
index ba8e100019..b32992f34c 100644
--- a/libavfilter/vf_hflip.c
+++ b/libavfilter/vf_hflip.c
@@ -25,6 +25,8 @@
  */
 
 #include "avfilter.h"
+#include "formats.h"
+#include "video.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/imgutils.h"
@@ -64,7 +66,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -156,7 +158,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         }
     }
 
-    avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
+    ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
 }
 
 AVFilter avfilter_vf_hflip = {
diff --git a/libavfilter/vf_hqdn3d.c b/libavfilter/vf_hqdn3d.c
index d1fcc7db8e..1d6ca78415 100644
--- a/libavfilter/vf_hqdn3d.c
+++ b/libavfilter/vf_hqdn3d.c
@@ -27,6 +27,8 @@
 
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
+#include "formats.h"
+#include "video.h"
 
 typedef struct {
     int Coefs[4][512*16];
@@ -268,7 +270,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
 
     return 0;
 }
@@ -317,8 +319,8 @@ static void end_frame(AVFilterLink *inlink)
             hqdn3d->Coefs[2],
             hqdn3d->Coefs[3]);
 
-    avfilter_draw_slice(outlink, 0, inpic->video->h, 1);
-    avfilter_end_frame(outlink);
+    ff_draw_slice(outlink, 0, inpic->video->h, 1);
+    ff_end_frame(outlink);
     avfilter_unref_buffer(inpic);
     avfilter_unref_buffer(outpic);
 }
diff --git a/libavfilter/vf_libopencv.c b/libavfilter/vf_libopencv.c
index 2255241138..dc92c0be71 100644
--- a/libavfilter/vf_libopencv.c
+++ b/libavfilter/vf_libopencv.c
@@ -61,7 +61,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_GRAY8, PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -364,8 +364,8 @@ static void end_frame(AVFilterLink *inlink)
     fill_picref_from_iplimage(outpicref, &outimg, inlink->format);
 
     avfilter_unref_buffer(inpicref);
-    avfilter_draw_slice(outlink, 0, outlink->h, 1);
-    avfilter_end_frame(outlink);
+    ff_draw_slice(outlink, 0, outlink->h, 1);
+    ff_end_frame(outlink);
     avfilter_unref_buffer(outpicref);
 }
 
diff --git a/libavfilter/vf_lut.c b/libavfilter/vf_lut.c
index ba8a85a214..9c8b4123cf 100644
--- a/libavfilter/vf_lut.c
+++ b/libavfilter/vf_lut.c
@@ -28,7 +28,9 @@
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
+#include "formats.h"
 #include "internal.h"
+#include "video.h"
 
 static const char *const var_names[] = {
     "w",        ///< width of the input video
@@ -146,7 +148,7 @@ static int query_formats(AVFilterContext *ctx)
     const enum PixelFormat *pix_fmts = lut->is_rgb ? rgb_pix_fmts :
                                        lut->is_yuv ? yuv_pix_fmts : all_pix_fmts;
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -334,7 +336,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         }
     }
 
-    avfilter_draw_slice(outlink, y, h, slice_dir);
+    ff_draw_slice(outlink, y, h, slice_dir);
 }
 
 #define DEFINE_LUT_FILTER(name_, description_, init_)                   \
diff --git a/libavfilter/vf_overlay.c b/libavfilter/vf_overlay.c
index 97a3e080c4..5bcd7afb2c 100644
--- a/libavfilter/vf_overlay.c
+++ b/libavfilter/vf_overlay.c
@@ -28,6 +28,7 @@
 /* #define DEBUG */
 
 #include "avfilter.h"
+#include "formats.h"
 #include "libavutil/eval.h"
 #include "libavutil/avstring.h"
 #include "libavutil/opt.h"
@@ -38,6 +39,7 @@
 #include "internal.h"
 #include "bufferqueue.h"
 #include "drawutils.h"
+#include "video.h"
 
 static const char *const var_names[] = {
     "main_w",    "W", ///< width  of the main    video
@@ -176,16 +178,16 @@ static int query_formats(AVFilterContext *ctx)
     AVFilterFormats *overlay_formats;
 
     if (over->allow_packed_rgb) {
-        main_formats    = avfilter_make_format_list(main_pix_fmts_rgb);
-        overlay_formats = avfilter_make_format_list(overlay_pix_fmts_rgb);
+        main_formats    = ff_make_format_list(main_pix_fmts_rgb);
+        overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb);
     } else {
-        main_formats    = avfilter_make_format_list(main_pix_fmts_yuv);
-        overlay_formats = avfilter_make_format_list(overlay_pix_fmts_yuv);
+        main_formats    = ff_make_format_list(main_pix_fmts_yuv);
+        overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv);
     }
 
-    avfilter_formats_ref(main_formats,    &ctx->inputs [MAIN   ]->out_formats);
-    avfilter_formats_ref(overlay_formats, &ctx->inputs [OVERLAY]->out_formats);
-    avfilter_formats_ref(main_formats,    &ctx->outputs[MAIN   ]->in_formats );
+    ff_formats_ref(main_formats,    &ctx->inputs [MAIN   ]->out_formats);
+    ff_formats_ref(overlay_formats, &ctx->inputs [OVERLAY]->out_formats);
+    ff_formats_ref(main_formats,    &ctx->outputs[MAIN   ]->in_formats );
 
     return 0;
 }
@@ -470,7 +472,7 @@ static int try_start_frame(AVFilterContext *ctx, AVFilterBufferRef *mainpic)
                 av_ts2str(over->overpicref->pts), av_ts2timestr(over->overpicref->pts, &outlink->time_base));
     av_dlog(ctx, "\n");
 
-    avfilter_start_frame(ctx->outputs[0], avfilter_ref_buffer(outpicref, ~0));
+    ff_start_frame(ctx->outputs[0], avfilter_ref_buffer(outpicref, ~0));
     over->frame_requested = 0;
     return 0;
 }
@@ -498,9 +500,9 @@ static int try_push_frame(AVFilterContext *ctx)
         blend_slice(ctx, outpicref, over->overpicref, over->x, over->y,
                     over->overpicref->video->w, over->overpicref->video->h,
                     0, outpicref->video->w, outpicref->video->h);
-    avfilter_draw_slice(outlink, 0, outpicref->video->h, +1);
+    ff_draw_slice(outlink, 0, outpicref->video->h, +1);
     avfilter_unref_bufferp(&outlink->out_buf);
-    avfilter_end_frame(outlink);
+    ff_end_frame(outlink);
     return 0;
 }
 
@@ -536,7 +538,7 @@ static void draw_slice_main(AVFilterLink *inlink, int y, int h, int slice_dir)
                     over->overpicref->video->w, over->overpicref->video->h,
                     y, outpicref->video->w, h);
     }
-    avfilter_draw_slice(outlink, y, h, slice_dir);
+    ff_draw_slice(outlink, y, h, slice_dir);
 }
 
 static void end_frame_main(AVFilterLink *inlink)
@@ -550,7 +552,7 @@ static void end_frame_main(AVFilterLink *inlink)
         return;
     avfilter_unref_bufferp(&inlink->cur_buf);
     avfilter_unref_bufferp(&outlink->out_buf);
-    avfilter_end_frame(ctx->outputs[0]);
+    ff_end_frame(ctx->outputs[0]);
 }
 
 static void start_frame_over(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
@@ -584,7 +586,7 @@ static int request_frame(AVFilterLink *outlink)
         input = !over->overlay_eof && (over->queue_main.available ||
                                        over->queue_over.available < 2) ?
                 OVERLAY : MAIN;
-        ret = avfilter_request_frame(ctx->inputs[input]);
+        ret = ff_request_frame(ctx->inputs[input]);
         /* EOF on main is reported immediately */
         if (ret == AVERROR_EOF && input == OVERLAY) {
             over->overlay_eof = 1;
diff --git a/libavfilter/vf_pad.c b/libavfilter/vf_pad.c
index 2a3c17ea18..31702b7318 100644
--- a/libavfilter/vf_pad.c
+++ b/libavfilter/vf_pad.c
@@ -25,6 +25,8 @@
  */
 
 #include "avfilter.h"
+#include "formats.h"
+#include "video.h"
 #include "libavutil/avstring.h"
 #include "libavutil/eval.h"
 #include "libavutil/pixdesc.h"
@@ -67,7 +69,7 @@ enum var_name {
 
 static int query_formats(AVFilterContext *ctx)
 {
-    avfilter_set_common_pixel_formats(ctx, ff_draw_supported_pixel_formats(0));
+    ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
     return 0;
 }
 
@@ -296,7 +298,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
     outpicref->video->w = pad->w;
     outpicref->video->h = pad->h;
 
-    avfilter_start_frame(inlink->dst->outputs[0], avfilter_ref_buffer(outpicref, ~0));
+    ff_start_frame(inlink->dst->outputs[0], avfilter_ref_buffer(outpicref, ~0));
 }
 
 static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice)
@@ -319,7 +321,7 @@ static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir,
                           link->dst->outputs[0]->out_buf->data,
                           link->dst->outputs[0]->out_buf->linesize,
                           0, bar_y, pad->w, bar_h);
-        avfilter_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
+        ff_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
     }
 }
 
@@ -352,7 +354,7 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
     /* right border */
     ff_fill_rectangle(&pad->draw, &pad->color, outpic->data, outpic->linesize,
                       pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h);
-    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
+    ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
 
     draw_send_bar_slice(link, y, h, slice_dir, -1);
 }
diff --git a/libavfilter/vf_pixdesctest.c b/libavfilter/vf_pixdesctest.c
index 9aee482874..9b7b373ecd 100644
--- a/libavfilter/vf_pixdesctest.c
+++ b/libavfilter/vf_pixdesctest.c
@@ -25,6 +25,7 @@
 
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
+#include "video.h"
 
 typedef struct {
     const AVPixFmtDescriptor *pix_desc;
@@ -76,7 +77,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
         priv->pix_desc->flags & PIX_FMT_PSEUDOPAL)
         memcpy(outpicref->data[1], picref->data[1], AVPALETTE_SIZE);
 
-    avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
+    ff_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
 }
 
 static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
@@ -106,7 +107,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         }
     }
 
-    avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
+    ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
 }
 
 AVFilter avfilter_vf_pixdesctest = {
diff --git a/libavfilter/vf_scale.c b/libavfilter/vf_scale.c
index 3106ccfa72..fab0568d9a 100644
--- a/libavfilter/vf_scale.c
+++ b/libavfilter/vf_scale.c
@@ -24,6 +24,8 @@
  */
 
 #include "avfilter.h"
+#include "formats.h"
+#include "video.h"
 #include "libavutil/avstring.h"
 #include "libavutil/eval.h"
 #include "libavutil/mathematics.h"
@@ -130,21 +132,21 @@ static int query_formats(AVFilterContext *ctx)
         formats = NULL;
         for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
             if (   sws_isSupportedInput(pix_fmt)
-                && (ret = avfilter_add_format(&formats, pix_fmt)) < 0) {
-                avfilter_formats_unref(&formats);
+                && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
+                ff_formats_unref(&formats);
                 return ret;
             }
-        avfilter_formats_ref(formats, &ctx->inputs[0]->out_formats);
+        ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
     }
     if (ctx->outputs[0]) {
         formats = NULL;
         for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
             if (   (sws_isSupportedOutput(pix_fmt) || pix_fmt == PIX_FMT_PAL8)
-                && (ret = avfilter_add_format(&formats, pix_fmt)) < 0) {
-                avfilter_formats_unref(&formats);
+                && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
+                ff_formats_unref(&formats);
                 return ret;
             }
-        avfilter_formats_ref(formats, &ctx->outputs[0]->in_formats);
+        ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
     }
 
     return 0;
@@ -293,7 +295,7 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 
 
     if (!scale->sws) {
-        avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
+        ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
         return;
     }
 
@@ -315,7 +317,7 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
               INT_MAX);
 
     scale->slice_y = 0;
-    avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
+    ff_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
 }
 
 static int scale_slice(AVFilterLink *link, struct SwsContext *sws, int y, int h, int mul, int field)
@@ -350,7 +352,7 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
     int out_h;
 
     if (!scale->sws) {
-        avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
+        ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
         return;
     }
 
@@ -367,7 +369,7 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 
     if (slice_dir == -1)
         scale->slice_y -= out_h;
-    avfilter_draw_slice(link->dst->outputs[0], scale->slice_y, out_h, slice_dir);
+    ff_draw_slice(link->dst->outputs[0], scale->slice_y, out_h, slice_dir);
     if (slice_dir == 1)
         scale->slice_y += out_h;
 }
diff --git a/libavfilter/vf_select.c b/libavfilter/vf_select.c
index be0bfc9cf0..aa996cb36e 100644
--- a/libavfilter/vf_select.c
+++ b/libavfilter/vf_select.c
@@ -28,6 +28,7 @@
 #include "libavcodec/dsputil.h"
 #include "avfilter.h"
 #include "formats.h"
+#include "internal.h"
 #include "video.h"
 
 static const char *const var_names[] = {
@@ -284,7 +285,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
                                       sizeof(picref), NULL);
             return;
         }
-        avfilter_start_frame(inlink->dst->outputs[0], avfilter_ref_buffer(picref, ~0));
+        ff_start_frame(inlink->dst->outputs[0], avfilter_ref_buffer(picref, ~0));
     }
 }
 
@@ -293,7 +294,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
     SelectContext *select = inlink->dst->priv;
 
     if (select->select && !select->cache_frames)
-        avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
+        ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
 }
 
 static void end_frame(AVFilterLink *inlink)
@@ -304,7 +305,7 @@ static void end_frame(AVFilterLink *inlink)
     if (select->select) {
         if (select->cache_frames)
             return;
-        avfilter_end_frame(inlink->dst->outputs[0]);
+        ff_end_frame(inlink->dst->outputs[0]);
     }
     avfilter_unref_buffer(picref);
 }
@@ -319,15 +320,15 @@ static int request_frame(AVFilterLink *outlink)
     if (av_fifo_size(select->pending_frames)) {
         AVFilterBufferRef *picref;
         av_fifo_generic_read(select->pending_frames, &picref, sizeof(picref), NULL);
-        avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
-        avfilter_draw_slice(outlink, 0, outlink->h, 1);
-        avfilter_end_frame(outlink);
+        ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
+        ff_draw_slice(outlink, 0, outlink->h, 1);
+        ff_end_frame(outlink);
         avfilter_unref_buffer(picref);
         return 0;
     }
 
     while (!select->select) {
-        int ret = avfilter_request_frame(inlink);
+        int ret = ff_request_frame(inlink);
         if (ret < 0)
             return ret;
     }
@@ -342,12 +343,12 @@ static int poll_frame(AVFilterLink *outlink)
     int count, ret;
 
     if (!av_fifo_size(select->pending_frames)) {
-        if ((count = avfilter_poll_frame(inlink)) <= 0)
+        if ((count = ff_poll_frame(inlink)) <= 0)
             return count;
         /* request frame from input, and apply select condition to it */
         select->cache_frames = 1;
         while (count-- && av_fifo_space(select->pending_frames)) {
-            ret = avfilter_request_frame(inlink);
+            ret = ff_request_frame(inlink);
             if (ret < 0)
                 break;
         }
diff --git a/libavfilter/vf_setpts.c b/libavfilter/vf_setpts.c
index 9a5170037f..e1f773483b 100644
--- a/libavfilter/vf_setpts.c
+++ b/libavfilter/vf_setpts.c
@@ -120,7 +120,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
     setpts->var_values[VAR_N] += 1.0;
     setpts->var_values[VAR_PREV_INPTS ] = TS2D(inpicref ->pts);
     setpts->var_values[VAR_PREV_OUTPTS] = TS2D(outpicref->pts);
-    avfilter_start_frame(inlink->dst->outputs[0], outpicref);
+    ff_start_frame(inlink->dst->outputs[0], outpicref);
 }
 
 static av_cold void uninit(AVFilterContext *ctx)
diff --git a/libavfilter/vf_settb.c b/libavfilter/vf_settb.c
index 00b735cdf7..9f4c1b2d16 100644
--- a/libavfilter/vf_settb.c
+++ b/libavfilter/vf_settb.c
@@ -110,7 +110,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
         avfilter_unref_buffer(picref);
     }
 
-    avfilter_start_frame(outlink, picref2);
+    ff_start_frame(outlink, picref2);
 }
 
 AVFilter avfilter_vf_settb = {
diff --git a/libavfilter/vf_showinfo.c b/libavfilter/vf_showinfo.c
index d14d99b1f1..9f3eb78ca4 100644
--- a/libavfilter/vf_showinfo.c
+++ b/libavfilter/vf_showinfo.c
@@ -82,7 +82,7 @@ static void end_frame(AVFilterLink *inlink)
 
     showinfo->frame++;
     avfilter_unref_buffer(picref);
-    avfilter_end_frame(inlink->dst->outputs[0]);
+    ff_end_frame(inlink->dst->outputs[0]);
 }
 
 AVFilter avfilter_vf_showinfo = {
diff --git a/libavfilter/vf_slicify.c b/libavfilter/vf_slicify.c
index f496bfd9b6..76d2b237bd 100644
--- a/libavfilter/vf_slicify.c
+++ b/libavfilter/vf_slicify.c
@@ -73,7 +73,7 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 
     av_log(link->dst, AV_LOG_DEBUG, "h:%d\n", slice->h);
 
-    avfilter_start_frame(link->dst->outputs[0], picref);
+    ff_start_frame(link->dst->outputs[0], picref);
 }
 
 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
@@ -83,16 +83,16 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 
     if (slice_dir == 1) {
         for (y2 = y; y2 + slice->h <= y + h; y2 += slice->h)
-            avfilter_draw_slice(link->dst->outputs[0], y2, slice->h, slice_dir);
+            ff_draw_slice(link->dst->outputs[0], y2, slice->h, slice_dir);
 
         if (y2 < y + h)
-            avfilter_draw_slice(link->dst->outputs[0], y2, y + h - y2, slice_dir);
+            ff_draw_slice(link->dst->outputs[0], y2, y + h - y2, slice_dir);
     } else if (slice_dir == -1) {
         for (y2 = y + h; y2 - slice->h >= y; y2 -= slice->h)
-            avfilter_draw_slice(link->dst->outputs[0], y2 - slice->h, slice->h, slice_dir);
+            ff_draw_slice(link->dst->outputs[0], y2 - slice->h, slice->h, slice_dir);
 
         if (y2 > y)
-            avfilter_draw_slice(link->dst->outputs[0], y, y2 - y, slice_dir);
+            ff_draw_slice(link->dst->outputs[0], y, y2 - y, slice_dir);
     }
 }
 
diff --git a/libavfilter/vf_transpose.c b/libavfilter/vf_transpose.c
index 596f3cb28d..3ac07f5870 100644
--- a/libavfilter/vf_transpose.c
+++ b/libavfilter/vf_transpose.c
@@ -29,6 +29,8 @@
 #include "libavutil/pixdesc.h"
 #include "libavutil/imgutils.h"
 #include "avfilter.h"
+#include "formats.h"
+#include "video.h"
 
 typedef struct {
     int hsub, vsub;
@@ -80,7 +82,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -126,7 +128,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
         outlink->out_buf->video->sample_aspect_ratio.den = picref->video->sample_aspect_ratio.num;
     }
 
-    avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
+    ff_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
 }
 
 static void end_frame(AVFilterLink *inlink)
@@ -187,8 +189,8 @@ static void end_frame(AVFilterLink *inlink)
     }
 
     avfilter_unref_buffer(inpic);
-    avfilter_draw_slice(outlink, 0, outpic->video->h, 1);
-    avfilter_end_frame(outlink);
+    ff_draw_slice(outlink, 0, outpic->video->h, 1);
+    ff_end_frame(outlink);
     avfilter_unref_buffer(outpic);
 }
 
diff --git a/libavfilter/vf_unsharp.c b/libavfilter/vf_unsharp.c
index 8535d73f3a..a280a0df7f 100644
--- a/libavfilter/vf_unsharp.c
+++ b/libavfilter/vf_unsharp.c
@@ -37,6 +37,8 @@
  */
 
 #include "avfilter.h"
+#include "formats.h"
+#include "video.h"
 #include "libavutil/common.h"
 #include "libavutil/mem.h"
 #include "libavutil/pixdesc.h"
@@ -162,7 +164,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P, PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
 
     return 0;
 }
@@ -223,8 +225,8 @@ static void end_frame(AVFilterLink *link)
     apply_unsharp(out->data[2], out->linesize[2], in->data[2], in->linesize[2], cw,      ch,      &unsharp->chroma);
 
     avfilter_unref_buffer(in);
-    avfilter_draw_slice(link->dst->outputs[0], 0, link->h, 1);
-    avfilter_end_frame(link->dst->outputs[0]);
+    ff_draw_slice(link->dst->outputs[0], 0, link->h, 1);
+    ff_end_frame(link->dst->outputs[0]);
     avfilter_unref_buffer(out);
 }
 
diff --git a/libavfilter/vf_vflip.c b/libavfilter/vf_vflip.c
index 24288e6966..2c8436ff20 100644
--- a/libavfilter/vf_vflip.c
+++ b/libavfilter/vf_vflip.c
@@ -78,14 +78,14 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *inpicref)
         }
     }
 
-    avfilter_start_frame(link->dst->outputs[0], outpicref);
+    ff_start_frame(link->dst->outputs[0], outpicref);
 }
 
 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
     AVFilterContext *ctx = link->dst;
 
-    avfilter_draw_slice(ctx->outputs[0], link->h - (y+h), h, -1 * slice_dir);
+    ff_draw_slice(ctx->outputs[0], link->h - (y+h), h, -1 * slice_dir);
 }
 
 AVFilter avfilter_vf_vflip = {
diff --git a/libavfilter/vf_yadif.c b/libavfilter/vf_yadif.c
index 19b699b584..a0a5e05526 100644
--- a/libavfilter/vf_yadif.c
+++ b/libavfilter/vf_yadif.c
@@ -22,6 +22,8 @@
 #include "libavutil/common.h"
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
 #include "video.h"
 #include "yadif.h"
 
@@ -227,10 +229,10 @@ static void return_frame(AVFilterContext *ctx, int is_second)
         } else {
             yadif->out->pts = AV_NOPTS_VALUE;
         }
-        avfilter_start_frame(ctx->outputs[0], yadif->out);
+        ff_start_frame(ctx->outputs[0], yadif->out);
     }
-    avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
-    avfilter_end_frame(ctx->outputs[0]);
+    ff_draw_slice(ctx->outputs[0], 0, link->h, 1);
+    ff_end_frame(ctx->outputs[0]);
 
     yadif->frame_pending = (yadif->mode&1) && !is_second;
 }
@@ -260,7 +262,7 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
         yadif->prev = NULL;
         if (yadif->out->pts != AV_NOPTS_VALUE)
             yadif->out->pts *= 2;
-        avfilter_start_frame(ctx->outputs[0], yadif->out);
+        ff_start_frame(ctx->outputs[0], yadif->out);
         return;
     }
 
@@ -274,7 +276,7 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
     yadif->out->video->interlaced = 0;
     if (yadif->out->pts != AV_NOPTS_VALUE)
         yadif->out->pts *= 2;
-    avfilter_start_frame(ctx->outputs[0], yadif->out);
+    ff_start_frame(ctx->outputs[0], yadif->out);
 }
 
 static void end_frame(AVFilterLink *link)
@@ -286,8 +288,8 @@ static void end_frame(AVFilterLink *link)
         return;
 
     if (yadif->auto_enable && !yadif->cur->video->interlaced) {
-        avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
-        avfilter_end_frame(ctx->outputs[0]);
+        ff_draw_slice(ctx->outputs[0], 0, link->h, 1);
+        ff_end_frame(ctx->outputs[0]);
         return;
     }
 
@@ -310,7 +312,7 @@ static int request_frame(AVFilterLink *link)
         if (yadif->eof)
             return AVERROR_EOF;
 
-        ret  = avfilter_request_frame(link->src->inputs[0]);
+        ret  = ff_request_frame(link->src->inputs[0]);
 
         if (ret == AVERROR_EOF && yadif->cur) {
             AVFilterBufferRef *next = avfilter_ref_buffer(yadif->next, AV_PERM_READ);
@@ -335,14 +337,14 @@ static int poll_frame(AVFilterLink *link)
     if (yadif->frame_pending)
         return 1;
 
-    val = avfilter_poll_frame(link->src->inputs[0]);
+    val = ff_poll_frame(link->src->inputs[0]);
     if (val <= 0)
         return val;
 
     if (val >= 1 && !yadif->next) { //FIXME change API to not requre this red tape
-        if ((ret = avfilter_request_frame(link->src->inputs[0])) < 0)
+        if ((ret = ff_request_frame(link->src->inputs[0])) < 0)
             return ret;
-        val = avfilter_poll_frame(link->src->inputs[0]);
+        val = ff_poll_frame(link->src->inputs[0]);
         if (val <= 0)
             return val;
     }
@@ -390,7 +392,7 @@ static int query_formats(AVFilterContext *ctx)
         PIX_FMT_NONE
     };
 
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
 
     return 0;
 }
diff --git a/libavfilter/video.c b/libavfilter/video.c
index c26c7b7327..d443885df2 100644
--- a/libavfilter/video.c
+++ b/libavfilter/video.c
@@ -151,7 +151,7 @@ AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int
 
 void ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
-    avfilter_start_frame(link->dst->outputs[0], picref);
+    ff_start_frame(link->dst->outputs[0], picref);
 }
 
 static void default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
@@ -164,13 +164,13 @@ static void default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
     if (outlink) {
         outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
         avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
-        avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
+        ff_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
     }
 }
 
 /* XXX: should we do the duplicating of the picture ref here, instead of
  * forcing the source filter to do it? */
-void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
     void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
     AVFilterPad *dst = link->dstpad;
@@ -217,7 +217,7 @@ void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 
 void ff_null_end_frame(AVFilterLink *link)
 {
-    avfilter_end_frame(link->dst->outputs[0]);
+    ff_end_frame(link->dst->outputs[0]);
 }
 
 static void default_end_frame(AVFilterLink *inlink)
@@ -235,11 +235,11 @@ static void default_end_frame(AVFilterLink *inlink)
             avfilter_unref_buffer(outlink->out_buf);
             outlink->out_buf = NULL;
         }
-        avfilter_end_frame(outlink);
+        ff_end_frame(outlink);
     }
 }
 
-void avfilter_end_frame(AVFilterLink *link)
+void ff_end_frame(AVFilterLink *link)
 {
     void (*end_frame)(AVFilterLink *);
 
@@ -258,7 +258,7 @@ void avfilter_end_frame(AVFilterLink *link)
 
 void ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
-    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
+    ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
 }
 
 static void default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
@@ -269,10 +269,10 @@ static void default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir
         outlink = inlink->dst->outputs[0];
 
     if (outlink)
-        avfilter_draw_slice(outlink, y, h, slice_dir);
+        ff_draw_slice(outlink, y, h, slice_dir);
 }
 
-void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
     uint8_t *src[4], *dst[4];
     int i, j, vsub;
@@ -346,4 +346,16 @@ void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
     ff_null_draw_slice(link, y, h, slice_dir);
 }
+void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+{
+    ff_start_frame(link, picref);
+}
+void avfilter_end_frame(AVFilterLink *link)
+{
+    ff_end_frame(link);
+}
+void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+{
+    ff_draw_slice(link, y, h, slice_dir);
+}
 #endif
diff --git a/libavfilter/video.h b/libavfilter/video.h
index e24dd9a38e..1fed45f925 100644
--- a/libavfilter/video.h
+++ b/libavfilter/video.h
@@ -33,4 +33,39 @@ void ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
 void ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
 void ff_null_end_frame(AVFilterLink *link);
 
+/**
+ * Notify the next filter of the start of a frame.
+ *
+ * @param link   the output link the frame will be sent over
+ * @param picref A reference to the frame about to be sent. The data for this
+ *               frame need only be valid once draw_slice() is called for that
+ *               portion. The receiving filter will free this reference when
+ *               it no longer needs it.
+ */
+void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
+
+/**
+ * Notify the next filter that the current frame has finished.
+ *
+ * @param link the output link the frame was sent over
+ */
+void ff_end_frame(AVFilterLink *link);
+
+/**
+ * Send a slice to the next filter.
+ *
+ * Slices have to be provided in sequential order, either in
+ * top-bottom or bottom-top order. If slices are provided in
+ * non-sequential order the behavior of the function is undefined.
+ *
+ * @param link the output link over which the frame is being sent
+ * @param y    offset in pixels from the top of the image for this slice
+ * @param h    height of this slice in pixels
+ * @param slice_dir the assumed direction for sending slices,
+ *             from the top slice to the bottom slice if the value is 1,
+ *             from the bottom slice to the top slice if the value is -1,
+ *             for other values the behavior of the function is undefined.
+ */
+void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
+
 #endif /* AVFILTER_VIDEO_H */
diff --git a/libavfilter/vsrc_color.c b/libavfilter/vsrc_color.c
index 69ba8e0a6f..cde971450c 100644
--- a/libavfilter/vsrc_color.c
+++ b/libavfilter/vsrc_color.c
@@ -24,6 +24,8 @@
  */
 
 #include "avfilter.h"
+#include "formats.h"
+#include "video.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/colorspace.h"
 #include "libavutil/imgutils.h"
@@ -73,7 +75,7 @@ static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaq
 
 static int query_formats(AVFilterContext *ctx)
 {
-    avfilter_set_common_pixel_formats(ctx, ff_draw_supported_pixel_formats(0));
+    ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
     return 0;
 }
 
@@ -108,11 +110,11 @@ static int color_request_frame(AVFilterLink *link)
     picref->pts = color->pts++;
     picref->pos = -1;
 
-    avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
+    ff_start_frame(link, avfilter_ref_buffer(picref, ~0));
     ff_fill_rectangle(&color->draw, &color->color, picref->data, picref->linesize,
                       0, 0, color->w, color->h);
-    avfilter_draw_slice(link, 0, color->h, 1);
-    avfilter_end_frame(link);
+    ff_draw_slice(link, 0, color->h, 1);
+    ff_end_frame(link);
     avfilter_unref_buffer(picref);
 
     return 0;
diff --git a/libavfilter/vsrc_testsrc.c b/libavfilter/vsrc_testsrc.c
index 7d7d5ce9d4..5de7abf51f 100644
--- a/libavfilter/vsrc_testsrc.c
+++ b/libavfilter/vsrc_testsrc.c
@@ -36,6 +36,8 @@
 #include "libavutil/intreadwrite.h"
 #include "libavutil/parseutils.h"
 #include "avfilter.h"
+#include "formats.h"
+#include "video.h"
 
 typedef struct {
     const AVClass *class;
@@ -146,9 +148,9 @@ static int request_frame(AVFilterLink *outlink)
     test->fill_picture_fn(outlink->src, picref);
     test->nb_frame++;
 
-    avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
-    avfilter_draw_slice(outlink, 0, picref->video->h, 1);
-    avfilter_end_frame(outlink);
+    ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
+    ff_draw_slice(outlink, 0, picref->video->h, 1);
+    ff_end_frame(outlink);
     avfilter_unref_buffer(picref);
 
     return 0;
@@ -388,7 +390,7 @@ static int test_query_formats(AVFilterContext *ctx)
     static const enum PixelFormat pix_fmts[] = {
         PIX_FMT_RGB24, PIX_FMT_NONE
     };
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
@@ -494,7 +496,7 @@ static int rgbtest_query_formats(AVFilterContext *ctx)
         PIX_FMT_RGB555, PIX_FMT_BGR555,
         PIX_FMT_NONE
     };
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
     return 0;
 }
 
diff --git a/libavformat/riff.c b/libavformat/riff.c
index 1266f8b3b6..48e0c72507 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -345,6 +345,7 @@ const AVCodecTag ff_codec_wav_tags[] = {
     { CODEC_ID_ATRAC3,          0x0270 },
     { CODEC_ID_ADPCM_G722,      0x028F },
     { CODEC_ID_IMC,             0x0401 },
+    { CODEC_ID_IAC,             0x0402 },
     { CODEC_ID_GSM_MS,          0x1500 },
     { CODEC_ID_TRUESPEECH,      0x1501 },
     { CODEC_ID_AAC,             0x1600 }, /* ADTS AAC */
diff --git a/libavformat/utils.c b/libavformat/utils.c
index ca97b91511..5185384cd2 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -673,6 +673,42 @@ fail:
 
 /*******************************************************/
 
+static void probe_codec(AVFormatContext *s, AVStream *st, const AVPacket *pkt)
+{
+    if(st->request_probe>0){
+        AVProbeData *pd = &st->probe_data;
+        int end;
+        av_log(s, AV_LOG_DEBUG, "probing stream %d pp:%d\n", st->index, st->probe_packets);
+        --st->probe_packets;
+
+        if (pkt) {
+            pd->buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
+            memcpy(pd->buf+pd->buf_size, pkt->data, pkt->size);
+            pd->buf_size += pkt->size;
+            memset(pd->buf+pd->buf_size, 0, AVPROBE_PADDING_SIZE);
+        } else {
+            st->probe_packets = 0;
+        }
+
+        end=    s->raw_packet_buffer_remaining_size <= 0
+                || st->probe_packets<=0;
+
+        if(end || av_log2(pd->buf_size) != av_log2(pd->buf_size - pkt->size)){
+            int score= set_codec_from_probe_data(s, st, pd);
+            if(    (st->codec->codec_id != CODEC_ID_NONE && score > AVPROBE_SCORE_MAX/4)
+                || end){
+                pd->buf_size=0;
+                av_freep(&pd->buf);
+                st->request_probe= -1;
+                if(st->codec->codec_id != CODEC_ID_NONE){
+                    av_log(s, AV_LOG_DEBUG, "probed stream %d\n", st->index);
+                }else
+                    av_log(s, AV_LOG_WARNING, "probed stream %d failed\n", st->index);
+            }
+        }
+    }
+}
+
 int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     int ret, i;
@@ -683,7 +719,8 @@ int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
 
         if (pktl) {
             *pkt = pktl->pkt;
-            if(s->streams[pkt->stream_index]->request_probe <= 0){
+            st = s->streams[pkt->stream_index];
+            if(st->request_probe <= 0){
                 s->raw_packet_buffer = pktl->next;
                 s->raw_packet_buffer_remaining_size += pkt->size;
                 av_free(pktl);
@@ -696,9 +733,13 @@ int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
         if (ret < 0) {
             if (!pktl || ret == AVERROR(EAGAIN))
                 return ret;
-            for (i = 0; i < s->nb_streams; i++)
-                if(s->streams[i]->request_probe > 0)
-                    s->streams[i]->request_probe = -1;
+            for (i = 0; i < s->nb_streams; i++) {
+                st = s->streams[i];
+                if (st->probe_packets) {
+                    probe_codec(s, st, NULL);
+                }
+                av_assert0(st->request_probe <= 0);
+            }
             continue;
         }
 
@@ -739,34 +780,7 @@ int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
         add_to_pktbuf(&s->raw_packet_buffer, pkt, &s->raw_packet_buffer_end);
         s->raw_packet_buffer_remaining_size -= pkt->size;
 
-        if(st->request_probe>0){
-            AVProbeData *pd = &st->probe_data;
-            int end;
-            av_log(s, AV_LOG_DEBUG, "probing stream %d pp:%d\n", st->index, st->probe_packets);
-            --st->probe_packets;
-
-            pd->buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
-            memcpy(pd->buf+pd->buf_size, pkt->data, pkt->size);
-            pd->buf_size += pkt->size;
-            memset(pd->buf+pd->buf_size, 0, AVPROBE_PADDING_SIZE);
-
-            end=    s->raw_packet_buffer_remaining_size <= 0
-                 || st->probe_packets<=0;
-
-            if(end || av_log2(pd->buf_size) != av_log2(pd->buf_size - pkt->size)){
-                int score= set_codec_from_probe_data(s, st, pd);
-                if(    (st->codec->codec_id != CODEC_ID_NONE && score > AVPROBE_SCORE_MAX/4)
-                    || end){
-                    pd->buf_size=0;
-                    av_freep(&pd->buf);
-                    st->request_probe= -1;
-                    if(st->codec->codec_id != CODEC_ID_NONE){
-                    av_log(s, AV_LOG_DEBUG, "probed stream %d\n", st->index);
-                    }else
-                        av_log(s, AV_LOG_WARNING, "probed stream %d failed\n", st->index);
-                }
-            }
-        }
+        probe_codec(s, st, pkt);
     }
 }