a5e8c41c28
It is not used in any filters currently and is inherently evil. If passing binary data to filters is required in the future, it should be done with some AVOptions-based system.
296 lines
9.7 KiB
C
296 lines
9.7 KiB
C
/*
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* FIFO buffering filter
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/audioconvert.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/samplefmt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "video.h"
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typedef struct Buf {
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AVFilterBufferRef *buf;
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struct Buf *next;
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} Buf;
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typedef struct {
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Buf root;
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Buf *last; ///< last buffered frame
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/**
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* When a specific number of output samples is requested, the partial
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* buffer is stored here
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*/
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AVFilterBufferRef *buf_out;
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int allocated_samples; ///< number of samples buf_out was allocated for
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} FifoContext;
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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FifoContext *fifo = ctx->priv;
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fifo->last = &fifo->root;
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av_log(ctx, AV_LOG_INFO, "\n");
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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FifoContext *fifo = ctx->priv;
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Buf *buf, *tmp;
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for (buf = fifo->root.next; buf; buf = tmp) {
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tmp = buf->next;
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avfilter_unref_buffer(buf->buf);
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av_free(buf);
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}
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avfilter_unref_buffer(fifo->buf_out);
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}
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static void add_to_queue(AVFilterLink *inlink, AVFilterBufferRef *buf)
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{
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FifoContext *fifo = inlink->dst->priv;
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fifo->last->next = av_mallocz(sizeof(Buf));
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fifo->last = fifo->last->next;
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fifo->last->buf = buf;
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}
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static void queue_pop(FifoContext *s)
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{
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Buf *tmp = s->root.next->next;
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if (s->last == s->root.next)
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s->last = &s->root;
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av_freep(&s->root.next);
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s->root.next = tmp;
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}
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static void end_frame(AVFilterLink *inlink) { }
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
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/**
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* Move data pointers and pts offset samples forward.
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*/
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static void buffer_offset(AVFilterLink *link, AVFilterBufferRef *buf,
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int offset)
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{
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int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
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int planar = av_sample_fmt_is_planar(link->format);
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int planes = planar ? nb_channels : 1;
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int block_align = av_get_bytes_per_sample(link->format) * (planar ? 1 : nb_channels);
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int i;
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av_assert0(buf->audio->nb_samples > offset);
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for (i = 0; i < planes; i++)
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buf->extended_data[i] += block_align*offset;
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if (buf->data != buf->extended_data)
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memcpy(buf->data, buf->extended_data,
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FFMIN(planes, FF_ARRAY_ELEMS(buf->data)) * sizeof(*buf->data));
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buf->linesize[0] -= block_align*offset;
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buf->audio->nb_samples -= offset;
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if (buf->pts != AV_NOPTS_VALUE) {
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buf->pts += av_rescale_q(offset, (AVRational){1, link->sample_rate},
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link->time_base);
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}
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}
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static int calc_ptr_alignment(AVFilterBufferRef *buf)
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{
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int planes = av_sample_fmt_is_planar(buf->format) ?
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av_get_channel_layout_nb_channels(buf->audio->channel_layout) : 1;
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int min_align = 128;
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int p;
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for (p = 0; p < planes; p++) {
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int cur_align = 128;
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while ((intptr_t)buf->extended_data[p] % cur_align)
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cur_align >>= 1;
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if (cur_align < min_align)
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min_align = cur_align;
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}
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return min_align;
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}
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static int return_audio_frame(AVFilterContext *ctx)
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{
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AVFilterLink *link = ctx->outputs[0];
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FifoContext *s = ctx->priv;
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AVFilterBufferRef *head = s->root.next->buf;
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AVFilterBufferRef *buf_out;
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int ret;
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if (!s->buf_out &&
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head->audio->nb_samples >= link->request_samples &&
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calc_ptr_alignment(head) >= 32) {
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if (head->audio->nb_samples == link->request_samples) {
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buf_out = head;
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queue_pop(s);
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} else {
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buf_out = avfilter_ref_buffer(head, AV_PERM_READ);
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buf_out->audio->nb_samples = link->request_samples;
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buffer_offset(link, head, link->request_samples);
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}
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} else {
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int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
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if (!s->buf_out) {
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s->buf_out = ff_get_audio_buffer(link, AV_PERM_WRITE,
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link->request_samples);
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if (!s->buf_out)
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return AVERROR(ENOMEM);
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s->buf_out->audio->nb_samples = 0;
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s->buf_out->pts = head->pts;
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s->allocated_samples = link->request_samples;
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} else if (link->request_samples != s->allocated_samples) {
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av_log(ctx, AV_LOG_ERROR, "request_samples changed before the "
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"buffer was returned.\n");
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return AVERROR(EINVAL);
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}
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while (s->buf_out->audio->nb_samples < s->allocated_samples) {
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int len = FFMIN(s->allocated_samples - s->buf_out->audio->nb_samples,
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head->audio->nb_samples);
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av_samples_copy(s->buf_out->extended_data, head->extended_data,
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s->buf_out->audio->nb_samples, 0, len, nb_channels,
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link->format);
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s->buf_out->audio->nb_samples += len;
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if (len == head->audio->nb_samples) {
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avfilter_unref_buffer(head);
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queue_pop(s);
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if (!s->root.next &&
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(ret = ff_request_frame(ctx->inputs[0])) < 0) {
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if (ret == AVERROR_EOF) {
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av_samples_set_silence(s->buf_out->extended_data,
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s->buf_out->audio->nb_samples,
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s->allocated_samples -
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s->buf_out->audio->nb_samples,
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nb_channels, link->format);
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s->buf_out->audio->nb_samples = s->allocated_samples;
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break;
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}
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return ret;
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}
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head = s->root.next->buf;
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} else {
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buffer_offset(link, head, len);
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}
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}
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buf_out = s->buf_out;
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s->buf_out = NULL;
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}
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ff_filter_samples(link, buf_out);
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return 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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FifoContext *fifo = outlink->src->priv;
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int ret;
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if (!fifo->root.next) {
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if ((ret = ff_request_frame(outlink->src->inputs[0])) < 0)
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return ret;
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}
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/* by doing this, we give ownership of the reference to the next filter,
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* so we don't have to worry about dereferencing it ourselves. */
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switch (outlink->type) {
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case AVMEDIA_TYPE_VIDEO:
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ff_start_frame(outlink, fifo->root.next->buf);
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ff_draw_slice (outlink, 0, outlink->h, 1);
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ff_end_frame (outlink);
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queue_pop(fifo);
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break;
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case AVMEDIA_TYPE_AUDIO:
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if (outlink->request_samples) {
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return return_audio_frame(outlink->src);
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} else {
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ff_filter_samples(outlink, fifo->root.next->buf);
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queue_pop(fifo);
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}
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break;
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default:
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return AVERROR(EINVAL);
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}
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return 0;
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}
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AVFilter avfilter_vf_fifo = {
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.name = "fifo",
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.description = NULL_IF_CONFIG_SMALL("Buffer input images and send them when they are requested."),
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.init = init,
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.uninit = uninit,
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.priv_size = sizeof(FifoContext),
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer= ff_null_get_video_buffer,
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.start_frame = add_to_queue,
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.draw_slice = draw_slice,
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.end_frame = end_frame,
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.rej_perms = AV_PERM_REUSE2, },
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{ .name = NULL}},
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.outputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.request_frame = request_frame, },
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{ .name = NULL}},
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};
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AVFilter avfilter_af_afifo = {
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.name = "afifo",
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.description = NULL_IF_CONFIG_SMALL("Buffer input frames and send them when they are requested."),
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.init = init,
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.uninit = uninit,
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.priv_size = sizeof(FifoContext),
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.get_audio_buffer = ff_null_get_audio_buffer,
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.filter_samples = add_to_queue,
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.rej_perms = AV_PERM_REUSE2, },
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{ .name = NULL}},
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.outputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.request_frame = request_frame, },
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{ .name = NULL}},
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};
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