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src_movie: implement multiple outputs.

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The audio and video code paths were too different,
most of the decoding has been rewritten.
This commit is contained in:
Nicolas George
2012-07-19 01:03:20 +02:00
parent 05776119c1
commit a7ac05ce2f
2 changed files with 415 additions and 336 deletions
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700
libavfilter/src_movie.c
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@@ -25,15 +25,16 @@
*
* @todo use direct rendering (no allocation of a new frame)
* @todo support a PTS correction mechanism
* @todo support more than one output stream
*/
/* #define DEBUG */
#include <float.h>
#include "libavutil/avstring.h"
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/timestamp.h"
#include "libavformat/avformat.h"
#include "audio.h"
#include "avcodec.h"
@@ -42,11 +43,10 @@
#include "internal.h"
#include "video.h"
typedef enum {
STATE_DECODING,
STATE_FLUSHING,
STATE_DONE,
} MovieState;
typedef struct {
AVStream *st;
int done;
} MovieStream;
typedef struct {
/* common A/V fields */
@@ -55,22 +55,18 @@ typedef struct {
double seek_point_d;
char *format_name;
char *file_name;
int stream_index;
char *stream_specs; /**< user-provided list of streams, separated by + */
int stream_index; /**< for compatibility */
int loop_count;
AVFormatContext *format_ctx;
AVCodecContext *codec_ctx;
MovieState state;
int eof;
AVPacket pkt, pkt0;
AVFrame *frame; ///< video frame to store the decoded images in
/* video-only fields */
int w, h;
AVFilterBufferRef *picref;
/* audio-only fields */
int bps; ///< bytes per sample
AVPacket pkt, pkt0;
AVFilterBufferRef *samplesref;
int max_stream_index; /**< max stream # actually used for output */
MovieStream *st; /**< array of all streams, one per output */
int *out_index; /**< stream number -> output number map, or -1 */
} MovieContext;
#define OFFSET(x) offsetof(MovieContext, x)
@@ -78,8 +74,10 @@ typedef struct {
static const AVOption movie_options[]= {
{"format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX },
{"f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX },
{"stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX },
{"streams", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX },
{"s", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX },
{"si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX },
{"stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX },
{"seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000 },
{"sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000 },
{"loop", "set loop count", OFFSET(loop_count), AV_OPT_TYPE_INT, {.dbl = 1}, 0, INT_MAX },
@@ -88,14 +86,91 @@ static const AVOption movie_options[]= {
AVFILTER_DEFINE_CLASS(movie);
static av_cold int movie_common_init(AVFilterContext *ctx, const char *args,
enum AVMediaType type)
static int movie_config_output_props(AVFilterLink *outlink);
static int movie_request_frame(AVFilterLink *outlink);
static AVStream *find_stream(void *log, AVFormatContext *avf, const char *spec)
{
int i, ret, already = 0, stream_id = -1;
char type_char, dummy;
AVStream *found = NULL;
enum AVMediaType type;
ret = sscanf(spec, "d%[av]%d%c", &type_char, &stream_id, &dummy);
if (ret >= 1 && ret <= 2) {
type = type_char == 'v' ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
ret = av_find_best_stream(avf, type, stream_id, -1, NULL, 0);
if (ret < 0) {
av_log(log, AV_LOG_ERROR, "No %s stream with index '%d' found\n",
av_get_media_type_string(type), stream_id);
return NULL;
}
return avf->streams[ret];
}
for (i = 0; i < avf->nb_streams; i++) {
ret = avformat_match_stream_specifier(avf, avf->streams[i], spec);
if (ret < 0) {
av_log(log, AV_LOG_ERROR,
"Invalid stream specifier \"%s\"\n", spec);
return NULL;
}
if (!ret)
continue;
if (avf->streams[i]->discard != AVDISCARD_ALL) {
already++;
continue;
}
if (found) {
av_log(log, AV_LOG_WARNING,
"Ambiguous stream specifier \"%s\", using #%d\n", spec, i);
break;
}
found = avf->streams[i];
}
if (!found) {
av_log(log, AV_LOG_WARNING, "Stream specifier \"%s\" %s\n", spec,
already ? "matched only already used streams" :
"did not match any stream");
return NULL;
}
if (found->codec->codec_type != AVMEDIA_TYPE_VIDEO &&
found->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
av_log(log, AV_LOG_ERROR, "Stream specifier \"%s\" matched a %s stream,"
"currently unsupported by libavfilter\n", spec,
av_get_media_type_string(found->codec->codec_type));
return NULL;
}
return found;
}
static int open_stream(void *log, MovieStream *st)
{
AVCodec *codec;
int ret;
codec = avcodec_find_decoder(st->st->codec->codec_id);
if (!codec) {
av_log(log, AV_LOG_ERROR, "Failed to find any codec\n");
return AVERROR(EINVAL);
}
if ((ret = avcodec_open2(st->st->codec, codec, NULL)) < 0) {
av_log(log, AV_LOG_ERROR, "Failed to open codec\n");
return ret;
}
return 0;
}
static av_cold int movie_init(AVFilterContext *ctx, const char *args)
{
MovieContext *movie = ctx->priv;
AVInputFormat *iformat = NULL;
AVCodec *codec;
int64_t timestamp;
int ret;
int nb_streams, ret, i;
char default_streams[16], *stream_specs, *spec, *cursor;
char name[16];
AVStream *st;
movie->class = &movie_class;
av_opt_set_defaults(movie);
@@ -114,6 +189,23 @@ static av_cold int movie_common_init(AVFilterContext *ctx, const char *args,
movie->seek_point = movie->seek_point_d * 1000000 + 0.5;
stream_specs = movie->stream_specs;
if (!stream_specs) {
snprintf(default_streams, sizeof(default_streams), "d%c%d",
!strcmp(ctx->filter->name, "amovie") ? 'a' : 'v',
movie->stream_index);
stream_specs = default_streams;
}
for (cursor = stream_specs, nb_streams = 1; *cursor; cursor++)
if (*cursor == '+')
nb_streams++;
if (movie->loop_count != 1 && nb_streams != 1) {
av_log(ctx, AV_LOG_ERROR,
"Loop with several streams is currently unsupported\n");
return AVERROR_PATCHWELCOME;
}
av_register_all();
// Try to find the movie format (container)
@@ -148,358 +240,358 @@ static av_cold int movie_common_init(AVFilterContext *ctx, const char *args,
}
}
/* select the media stream */
if ((ret = av_find_best_stream(movie->format_ctx, type,
movie->stream_index, -1, NULL, 0)) < 0) {
av_log(ctx, AV_LOG_ERROR, "No %s stream with index '%d' found\n",
av_get_media_type_string(type), movie->stream_index);
return ret;
}
movie->stream_index = ret;
movie->codec_ctx = movie->format_ctx->streams[movie->stream_index]->codec;
for (i = 0; i < movie->format_ctx->nb_streams; i++)
movie->format_ctx->streams[i]->discard = AVDISCARD_ALL;
/*
* So now we've got a pointer to the so-called codec context for our video
* stream, but we still have to find the actual codec and open it.
*/
codec = avcodec_find_decoder(movie->codec_ctx->codec_id);
if (!codec) {
av_log(ctx, AV_LOG_ERROR, "Failed to find any codec\n");
return AVERROR(EINVAL);
movie->st = av_calloc(nb_streams, sizeof(*movie->st));
if (!movie->st)
return AVERROR(ENOMEM);
for (i = 0; i < nb_streams; i++) {
spec = av_strtok(stream_specs, "+", &cursor);
if (!spec)
return AVERROR_BUG;
stream_specs = NULL; /* for next strtok */
st = find_stream(ctx, movie->format_ctx, spec);
if (!st)
return AVERROR(EINVAL);
st->discard = AVDISCARD_DEFAULT;
movie->st[i].st = st;
movie->max_stream_index = FFMAX(movie->max_stream_index, st->index);
}
if (av_strtok(NULL, "+", &cursor))
return AVERROR_BUG;
movie->out_index = av_calloc(movie->max_stream_index + 1,
sizeof(*movie->out_index));
if (!movie->out_index)
return AVERROR(ENOMEM);
for (i = 0; i <= movie->max_stream_index; i++)
movie->out_index[i] = -1;
for (i = 0; i < nb_streams; i++)
movie->out_index[movie->st[i].st->index] = i;
for (i = 0; i < nb_streams; i++) {
AVFilterPad pad = { 0 };
snprintf(name, sizeof(name), "out%d", i);
pad.type = movie->st[i].st->codec->codec_type;
pad.name = av_strdup(name);
pad.config_props = movie_config_output_props;
pad.request_frame = movie_request_frame;
ff_insert_outpad(ctx, i, &pad);
ret = open_stream(ctx, &movie->st[i]);
if (ret < 0)
return ret;
}
if ((ret = avcodec_open2(movie->codec_ctx, codec, NULL)) < 0) {
av_log(ctx, AV_LOG_ERROR, "Failed to open codec\n");
return ret;
if (!(movie->frame = avcodec_alloc_frame()) ) {
av_log(log, AV_LOG_ERROR, "Failed to alloc frame\n");
return AVERROR(ENOMEM);
}
av_log(ctx, AV_LOG_VERBOSE, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",
movie->seek_point, movie->format_name, movie->file_name,
movie->stream_index);
if (!(movie->frame = avcodec_alloc_frame()) ) {
av_log(ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
return AVERROR(ENOMEM);
}
return 0;
}
static av_cold void movie_common_uninit(AVFilterContext *ctx)
static av_cold void movie_uninit(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
int i;
av_free(movie->file_name);
av_free(movie->format_name);
if (movie->codec_ctx)
avcodec_close(movie->codec_ctx);
for (i = 0; i < ctx->nb_outputs; i++) {
av_freep(&ctx->output_pads[i].name);
if (movie->st[i].st)
avcodec_close(movie->st[i].st->codec);
}
av_opt_free(movie);
av_freep(&movie->file_name);
av_freep(&movie->st);
av_freep(&movie->out_index);
av_freep(&movie->frame);
if (movie->format_ctx)
avformat_close_input(&movie->format_ctx);
avfilter_unref_buffer(movie->picref);
av_freep(&movie->frame);
avfilter_unref_buffer(movie->samplesref);
}
#if CONFIG_MOVIE_FILTER
static av_cold int movie_init(AVFilterContext *ctx, const char *args)
{
MovieContext *movie = ctx->priv;
int ret;
if ((ret = movie_common_init(ctx, args, AVMEDIA_TYPE_VIDEO)) < 0)
return ret;
movie->w = movie->codec_ctx->width;
movie->h = movie->codec_ctx->height;
return 0;
}
static int movie_query_formats(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
enum PixelFormat pix_fmts[] = { movie->codec_ctx->pix_fmt, PIX_FMT_NONE };
int list[] = { 0, -1 };
int64_t list64[] = { 0, -1 };
int i;
for (i = 0; i < ctx->nb_outputs; i++) {
MovieStream *st = &movie->st[i];
AVCodecContext *c = st->st->codec;
AVFilterLink *outlink = ctx->outputs[i];
switch (c->codec_type) {
case AVMEDIA_TYPE_VIDEO:
list[0] = c->pix_fmt;
ff_formats_ref(ff_make_format_list(list), &outlink->in_formats);
break;
case AVMEDIA_TYPE_AUDIO:
list[0] = c->sample_fmt;
ff_formats_ref(ff_make_format_list(list), &outlink->in_formats);
list[0] = c->sample_rate;
ff_formats_ref(ff_make_format_list(list), &outlink->in_samplerates);
list64[0] = c->channel_layout ? c->channel_layout :
av_get_default_channel_layout(c->channels);
ff_channel_layouts_ref(avfilter_make_format64_list(list64),
&outlink->in_channel_layouts);
break;
}
}
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int movie_config_output_props(AVFilterLink *outlink)
{
MovieContext *movie = outlink->src->priv;
AVFilterContext *ctx = outlink->src;
MovieContext *movie = ctx->priv;
unsigned out_id = FF_OUTLINK_IDX(outlink);
MovieStream *st = &movie->st[out_id];
AVCodecContext *c = st->st->codec;
outlink->w = movie->w;
outlink->h = movie->h;
outlink->time_base = movie->format_ctx->streams[movie->stream_index]->time_base;
outlink->time_base = st->st->time_base;
switch (c->codec_type) {
case AVMEDIA_TYPE_VIDEO:
outlink->w = c->width;
outlink->h = c->height;
outlink->frame_rate = st->st->r_frame_rate;
break;
case AVMEDIA_TYPE_AUDIO:
break;
}
return 0;
}
static int movie_get_frame(AVFilterLink *outlink)
static AVFilterBufferRef *frame_to_buf(enum AVMediaType type, AVFrame *frame,
AVFilterLink *outlink)
{
MovieContext *movie = outlink->src->priv;
AVPacket pkt;
int ret = 0, frame_decoded;
AVStream *st = movie->format_ctx->streams[movie->stream_index];
AVFilterBufferRef *buf, *copy;
if (movie->state == STATE_DONE)
return 0;
buf = avfilter_get_buffer_ref_from_frame(type, frame,
AV_PERM_WRITE |
AV_PERM_PRESERVE |
AV_PERM_REUSE2);
if (!buf)
return NULL;
buf->pts = av_frame_get_best_effort_timestamp(frame);
copy = ff_copy_buffer_ref(outlink, buf);
if (!copy)
return NULL;
buf->buf->data[0] = NULL; /* it belongs to the frame */
avfilter_unref_buffer(buf);
return copy;
}
while (1) {
if (movie->state == STATE_DECODING) {
ret = av_read_frame(movie->format_ctx, &pkt);
if (ret == AVERROR_EOF) {
int64_t timestamp;
if (movie->loop_count != 1) {
timestamp = movie->seek_point;
if (movie->format_ctx->start_time != AV_NOPTS_VALUE)
timestamp += movie->format_ctx->start_time;
if (av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD) < 0) {
movie->state = STATE_FLUSHING;
} else if (movie->loop_count>1)
movie->loop_count--;
continue;
} else {
movie->state = STATE_FLUSHING;
}
} else if (ret < 0)
break;
}
static char *describe_bufref_to_str(char *dst, size_t dst_size,
AVFilterBufferRef *buf,
AVFilterLink *link)
{
switch (buf->type) {
case AVMEDIA_TYPE_VIDEO:
snprintf(dst, dst_size,
"video pts:%s time:%s pos:%"PRId64" size:%dx%d aspect:%d/%d",
av_ts2str(buf->pts), av_ts2timestr(buf->pts, &link->time_base),
buf->pos, buf->video->w, buf->video->h,
buf->video->sample_aspect_ratio.num,
buf->video->sample_aspect_ratio.den);
break;
case AVMEDIA_TYPE_AUDIO:
snprintf(dst, dst_size,
"audio pts:%s time:%s pos:%"PRId64" samples:%d",
av_ts2str(buf->pts), av_ts2timestr(buf->pts, &link->time_base),
buf->pos, buf->audio->nb_samples);
break;
default:
snprintf(dst, dst_size, "%s BUG", av_get_media_type_string(buf->type));
break;
}
return dst;
}
// Is this a packet from the video stream?
if (pkt.stream_index == movie->stream_index || movie->state == STATE_FLUSHING) {
avcodec_decode_video2(movie->codec_ctx, movie->frame, &frame_decoded, &pkt);
#define describe_bufref(buf, link) \
describe_bufref_to_str((char[1024]){0}, 1024, buf, link)
if (frame_decoded) {
/* FIXME: avoid the memcpy */
movie->picref = ff_get_video_buffer(outlink, AV_PERM_WRITE | AV_PERM_PRESERVE |
AV_PERM_REUSE2, outlink->w, outlink->h);
av_image_copy(movie->picref->data, movie->picref->linesize,
(void*)movie->frame->data, movie->frame->linesize,
movie->picref->format, outlink->w, outlink->h);
avfilter_copy_frame_props(movie->picref, movie->frame);
static int rewind_file(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
int64_t timestamp = movie->seek_point;
int ret, i;
/* FIXME: use a PTS correction mechanism as that in
* ffplay.c when some API will be available for that */
/* use pkt_dts if pkt_pts is not available */
movie->picref->pts = movie->frame->pkt_pts == AV_NOPTS_VALUE ?
movie->frame->pkt_dts : movie->frame->pkt_pts;
if (!movie->frame->sample_aspect_ratio.num)
movie->picref->video->sample_aspect_ratio = st->sample_aspect_ratio;
av_dlog(outlink->src,
"movie_get_frame(): file:'%s' pts:%"PRId64" time:%lf pos:%"PRId64" aspect:%d/%d\n",
movie->file_name, movie->picref->pts,
(double)movie->picref->pts * av_q2d(st->time_base),
movie->picref->pos,
movie->picref->video->sample_aspect_ratio.num,
movie->picref->video->sample_aspect_ratio.den);
// We got it. Free the packet since we are returning
av_free_packet(&pkt);
return 0;
} else if (movie->state == STATE_FLUSHING) {
movie->state = STATE_DONE;
av_free_packet(&pkt);
return AVERROR_EOF;
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&pkt);
if (movie->format_ctx->start_time != AV_NOPTS_VALUE)
timestamp += movie->format_ctx->start_time;
ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Unable to loop: %s\n", av_err2str(ret));
movie->loop_count = 1; /* do not try again */
return ret;
}
return ret;
for (i = 0; i < ctx->nb_outputs; i++) {
avcodec_flush_buffers(movie->st[i].st->codec);
movie->st[i].done = 0;
}
movie->eof = 0;
return 0;
}
/**
* Try to push a frame to the requested output.
*
* @return 1 if a frame was pushed on the requested output,
* 0 if another attempt is possible,
* <0 AVERROR code
*/
static int movie_push_frame(AVFilterContext *ctx, unsigned out_id)
{
MovieContext *movie = ctx->priv;
AVPacket *pkt = &movie->pkt;
MovieStream *st;
int ret, got_frame = 0, pkt_out_id;
AVFilterLink *outlink;
AVFilterBufferRef *buf;
if (!pkt->size) {
if (movie->eof) {
if (movie->st[out_id].done) {
if (movie->loop_count != 1) {
ret = rewind_file(ctx);
if (ret < 0)
return ret;
movie->loop_count -= movie->loop_count > 1;
av_log(ctx, AV_LOG_VERBOSE, "Stream finished, looping.\n");
return 0; /* retry */
}
return AVERROR_EOF;
}
/* packet is already ready for flushing */
} else {
ret = av_read_frame(movie->format_ctx, &movie->pkt0);
if (ret < 0) {
av_init_packet(&movie->pkt0); /* ready for flushing */
*pkt = movie->pkt0;
if (ret == AVERROR_EOF) {
movie->eof = 1;
return 0; /* start flushing */
}
return ret;
}
*pkt = movie->pkt0;
}
}
pkt_out_id = pkt->stream_index > movie->max_stream_index ? -1 :
movie->out_index[pkt->stream_index];
if (pkt_out_id < 0) {
av_free_packet(&movie->pkt0);
pkt->size = 0; /* ready for next run */
pkt->data = NULL;
return 0;
}
st = &movie->st[pkt_out_id];
outlink = ctx->outputs[pkt_out_id];
switch (st->st->codec->codec_type) {
case AVMEDIA_TYPE_VIDEO:
ret = avcodec_decode_video2(st->st->codec, movie->frame, &got_frame, pkt);
break;
case AVMEDIA_TYPE_AUDIO:
ret = avcodec_decode_audio4(st->st->codec, movie->frame, &got_frame, pkt);
break;
default:
ret = AVERROR(ENOSYS);
break;
}
if (ret < 0) {
av_log(ctx, AV_LOG_WARNING, "Decode error: %s\n", av_err2str(ret));
return 0;
}
if (!ret)
ret = pkt->size;
pkt->data += ret;
pkt->size -= ret;
if (pkt->size <= 0) {
av_free_packet(&movie->pkt0);
pkt->size = 0; /* ready for next run */
pkt->data = NULL;
}
if (!got_frame) {
if (!ret)
st->done = 1;
return 0;
}
buf = frame_to_buf(st->st->codec->codec_type, movie->frame, outlink);
if (!buf)
return AVERROR(ENOMEM);
av_dlog(ctx, "movie_push_frame(): file:'%s' %s\n", movie->file_name,
describe_bufref(buf, outlink));
switch (st->st->codec->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (!movie->frame->sample_aspect_ratio.num)
buf->video->sample_aspect_ratio = st->st->sample_aspect_ratio;
ff_start_frame(outlink, buf);
ff_draw_slice(outlink, 0, outlink->h, 1);
ff_end_frame(outlink);
break;
case AVMEDIA_TYPE_AUDIO:
ff_filter_samples(outlink, buf);
break;
}
return pkt_out_id == out_id;
}
static int movie_request_frame(AVFilterLink *outlink)
{
AVFilterBufferRef *outpicref;
MovieContext *movie = outlink->src->priv;
AVFilterContext *ctx = outlink->src;
unsigned out_id = FF_OUTLINK_IDX(outlink);
int ret;
if (movie->state == STATE_DONE)
return AVERROR_EOF;
if ((ret = movie_get_frame(outlink)) < 0)
return ret;
outpicref = avfilter_ref_buffer(movie->picref, ~0);
if (!outpicref) {
ret = AVERROR(ENOMEM);
goto fail;
while (1) {
ret = movie_push_frame(ctx, out_id);
if (ret)
return FFMIN(ret, 0);
}
ret = ff_start_frame(outlink, outpicref);
if (ret < 0)
goto fail;
ret = ff_draw_slice(outlink, 0, outlink->h, 1);
if (ret < 0)
goto fail;
ret = ff_end_frame(outlink);
fail:
avfilter_unref_bufferp(&movie->picref);
return ret;
}
#if CONFIG_MOVIE_FILTER
AVFilter avfilter_vsrc_movie = {
.name = "movie",
.description = NULL_IF_CONFIG_SMALL("Read from a movie source."),
.priv_size = sizeof(MovieContext),
.init = movie_init,
.uninit = movie_common_uninit,
.uninit = movie_uninit,
.query_formats = movie_query_formats,
.inputs = (const AVFilterPad[]) {{ .name = NULL }},
.outputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = movie_request_frame,
.config_props = movie_config_output_props, },
{ .name = NULL}},
.outputs = (const AVFilterPad[]) {{ .name = NULL }},
};
#endif /* CONFIG_MOVIE_FILTER */
#if CONFIG_AMOVIE_FILTER
static av_cold int amovie_init(AVFilterContext *ctx, const char *args)
{
MovieContext *movie = ctx->priv;
int ret;
if ((ret = movie_common_init(ctx, args, AVMEDIA_TYPE_AUDIO)) < 0)
return ret;
movie->bps = av_get_bytes_per_sample(movie->codec_ctx->sample_fmt);
return 0;
}
static int amovie_query_formats(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
AVCodecContext *c = movie->codec_ctx;
enum AVSampleFormat sample_fmts[] = { c->sample_fmt, -1 };
int sample_rates[] = { c->sample_rate, -1 };
int64_t chlayouts[] = { c->channel_layout ? c->channel_layout :
av_get_default_channel_layout(c->channels), -1 };
ff_set_common_formats (ctx, ff_make_format_list(sample_fmts));
ff_set_common_samplerates (ctx, ff_make_format_list(sample_rates));
ff_set_common_channel_layouts(ctx, avfilter_make_format64_list(chlayouts));
return 0;
}
static int amovie_config_output_props(AVFilterLink *outlink)
{
MovieContext *movie = outlink->src->priv;
AVCodecContext *c = movie->codec_ctx;
outlink->sample_rate = c->sample_rate;
outlink->time_base = movie->format_ctx->streams[movie->stream_index]->time_base;
return 0;
}
static int amovie_get_samples(AVFilterLink *outlink)
{
MovieContext *movie = outlink->src->priv;
AVPacket pkt;
int ret, got_frame = 0;
if (!movie->pkt.size && movie->state == STATE_DONE)
return AVERROR_EOF;
/* check for another frame, in case the previous one was completely consumed */
if (!movie->pkt.size) {
while ((ret = av_read_frame(movie->format_ctx, &pkt)) >= 0) {
// Is this a packet from the selected stream?
if (pkt.stream_index != movie->stream_index) {
av_free_packet(&pkt);
continue;
} else {
movie->pkt0 = movie->pkt = pkt;
break;
}
}
if (ret == AVERROR_EOF) {
movie->state = STATE_DONE;
return ret;
}
}
/* decode and update the movie pkt */
avcodec_get_frame_defaults(movie->frame);
ret = avcodec_decode_audio4(movie->codec_ctx, movie->frame, &got_frame, &movie->pkt);
if (ret < 0) {
movie->pkt.size = 0;
return ret;
}
movie->pkt.data += ret;
movie->pkt.size -= ret;
/* wrap the decoded data in a samplesref */
if (got_frame) {
int nb_samples = movie->frame->nb_samples;
int data_size =
av_samples_get_buffer_size(NULL, movie->codec_ctx->channels,
nb_samples, movie->codec_ctx->sample_fmt, 1);
if (data_size < 0)
return data_size;
movie->samplesref =
ff_get_audio_buffer(outlink, AV_PERM_WRITE, nb_samples);
memcpy(movie->samplesref->data[0], movie->frame->data[0], data_size);
movie->samplesref->pts = movie->pkt.pts;
movie->samplesref->pos = movie->pkt.pos;
movie->samplesref->audio->sample_rate = movie->codec_ctx->sample_rate;
}
// We got it. Free the packet since we are returning
if (movie->pkt.size <= 0)
av_free_packet(&movie->pkt0);
return 0;
}
static int amovie_request_frame(AVFilterLink *outlink)
{
MovieContext *movie = outlink->src->priv;
int ret;
if (movie->state == STATE_DONE)
return AVERROR_EOF;
do {
if ((ret = amovie_get_samples(outlink)) < 0)
return ret;
} while (!movie->samplesref);
ff_filter_samples(outlink, avfilter_ref_buffer(movie->samplesref, ~0));
avfilter_unref_buffer(movie->samplesref);
movie->samplesref = NULL;
return 0;
}
AVFilter avfilter_asrc_amovie = {
.name = "amovie",
.description = NULL_IF_CONFIG_SMALL("Read audio from a movie source."),
.priv_size = sizeof(MovieContext),
.init = amovie_init,
.uninit = movie_common_uninit,
.query_formats = amovie_query_formats,
.init = movie_init,
.uninit = movie_uninit,
.query_formats = movie_query_formats,
.inputs = (const AVFilterPad[]) {{ .name = NULL }},
.outputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.request_frame = amovie_request_frame,
.config_props = amovie_config_output_props, },
{ .name = NULL}},
.outputs = (const AVFilterPad[]) {{ .name = NULL }},
};
#endif /* CONFIG_AMOVIE_FILTER */