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ffmpeg/libavfilter/buffersink.c

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/*
* Copyright (c) 2011 Stefano Sabatini
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* buffer sink
*/
#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/mathematics.h"
#include "audio.h"
#include "avfilter.h"
#include "buffersink.h"
#include "internal.h"
typedef struct {
AVFifoBuffer *fifo; ///< FIFO buffer of video frame references
unsigned warning_limit;
/* only used for video */
enum AVPixelFormat *pixel_fmts; ///< list of accepted pixel formats, must be terminated with -1
/* only used for audio */
enum AVSampleFormat *sample_fmts; ///< list of accepted sample formats, terminated by AV_SAMPLE_FMT_NONE
int64_t *channel_layouts; ///< list of accepted channel layouts, terminated by -1
int all_channel_counts;
int *sample_rates; ///< list of accepted sample rates, terminated by -1
/* only used for compat API */
AVAudioFifo *audio_fifo; ///< FIFO for audio samples
int64_t next_pts; ///< interpolating audio pts
} BufferSinkContext;
static av_cold void uninit(AVFilterContext *ctx)
{
BufferSinkContext *sink = ctx->priv;
AVFrame *frame;
if (sink->audio_fifo)
av_audio_fifo_free(sink->audio_fifo);
if (sink->fifo) {
while (av_fifo_size(sink->fifo) >= sizeof(AVFilterBufferRef *)) {
av_fifo_generic_read(sink->fifo, &frame, sizeof(frame), NULL);
av_frame_unref(frame);
}
av_fifo_free(sink->fifo);
sink->fifo = NULL;
}
av_freep(&sink->pixel_fmts);
av_freep(&sink->sample_fmts);
av_freep(&sink->sample_rates);
av_freep(&sink->channel_layouts);
}
static int add_buffer_ref(AVFilterContext *ctx, AVFrame *ref)
{
BufferSinkContext *buf = ctx->priv;
if (av_fifo_space(buf->fifo) < sizeof(AVFilterBufferRef *)) {
/* realloc fifo size */
if (av_fifo_realloc2(buf->fifo, av_fifo_size(buf->fifo) * 2) < 0) {
av_log(ctx, AV_LOG_ERROR,
"Cannot buffer more frames. Consume some available frames "
"before adding new ones.\n");
return AVERROR(ENOMEM);
}
}
/* cache frame */
av_fifo_generic_write(buf->fifo, &ref, sizeof(AVFilterBufferRef *), NULL);
return 0;
}
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AVFilterContext *ctx = link->dst;
BufferSinkContext *buf = link->dst->priv;
int ret;
if ((ret = add_buffer_ref(ctx, frame)) < 0)
return ret;
if (buf->warning_limit &&
av_fifo_size(buf->fifo) / sizeof(AVFilterBufferRef *) >= buf->warning_limit) {
av_log(ctx, AV_LOG_WARNING,
"%d buffers queued in %s, something may be wrong.\n",
buf->warning_limit,
(char *)av_x_if_null(ctx->name, ctx->filter->name));
buf->warning_limit *= 10;
}
return 0;
}
int av_buffersink_get_frame(AVFilterContext *ctx, AVFrame *frame)
{
return av_buffersink_get_frame_flags(ctx, frame, 0);
}
int av_buffersink_get_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
{
BufferSinkContext *buf = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
int ret;
AVFrame *cur_frame;
/* no picref available, fetch it from the filterchain */
if (!av_fifo_size(buf->fifo)) {
if (flags & AV_BUFFERSINK_FLAG_NO_REQUEST)
return AVERROR(EAGAIN);
if ((ret = ff_request_frame(inlink)) < 0)
return ret;
}
if (!av_fifo_size(buf->fifo))
return AVERROR(EINVAL);
if (flags & AV_BUFFERSINK_FLAG_PEEK) {
cur_frame = *((AVFrame **)av_fifo_peek2(buf->fifo, 0));
av_frame_ref(frame, cur_frame); /* TODO check failure */
} else {
av_fifo_generic_read(buf->fifo, &cur_frame, sizeof(cur_frame), NULL);
av_frame_move_ref(frame, cur_frame);
av_frame_free(&cur_frame);
}
return 0;
}
static int read_from_fifo(AVFilterContext *ctx, AVFrame *frame,
int nb_samples)
{
BufferSinkContext *s = ctx->priv;
AVFilterLink *link = ctx->inputs[0];
AVFrame *tmp;
if (!(tmp = ff_get_audio_buffer(link, nb_samples)))
return AVERROR(ENOMEM);
av_audio_fifo_read(s->audio_fifo, (void**)tmp->extended_data, nb_samples);
tmp->pts = s->next_pts;
s->next_pts += av_rescale_q(nb_samples, (AVRational){1, link->sample_rate},
link->time_base);
av_frame_move_ref(frame, tmp);
av_frame_free(&tmp);
return 0;
}
int av_buffersink_get_samples(AVFilterContext *ctx, AVFrame *frame, int nb_samples)
{
BufferSinkContext *s = ctx->priv;
AVFilterLink *link = ctx->inputs[0];
AVFrame *cur_frame;
int ret = 0;
if (!s->audio_fifo) {
int nb_channels = link->channels;
if (!(s->audio_fifo = av_audio_fifo_alloc(link->format, nb_channels, nb_samples)))
return AVERROR(ENOMEM);
}
while (ret >= 0) {
if (av_audio_fifo_size(s->audio_fifo) >= nb_samples)
return read_from_fifo(ctx, frame, nb_samples);
if (!(cur_frame = av_frame_alloc()))
return AVERROR(ENOMEM);
ret = av_buffersink_get_frame_flags(ctx, cur_frame, 0);
if (ret == AVERROR_EOF && av_audio_fifo_size(s->audio_fifo)) {
av_frame_free(&cur_frame);
return read_from_fifo(ctx, frame, av_audio_fifo_size(s->audio_fifo));
} else if (ret < 0) {
av_frame_free(&cur_frame);
return ret;
}
if (cur_frame->pts != AV_NOPTS_VALUE) {
s->next_pts = cur_frame->pts -
av_rescale_q(av_audio_fifo_size(s->audio_fifo),
(AVRational){ 1, link->sample_rate },
link->time_base);
}
ret = av_audio_fifo_write(s->audio_fifo, (void**)cur_frame->extended_data,
cur_frame->nb_samples);
av_frame_free(&cur_frame);
}
return ret;
}
AVBufferSinkParams *av_buffersink_params_alloc(void)
{
static const int pixel_fmts[] = { AV_PIX_FMT_NONE };
AVBufferSinkParams *params = av_malloc(sizeof(AVBufferSinkParams));
if (!params)
return NULL;
params->pixel_fmts = pixel_fmts;
return params;
}
AVABufferSinkParams *av_abuffersink_params_alloc(void)
{
AVABufferSinkParams *params = av_mallocz(sizeof(AVABufferSinkParams));
if (!params)
return NULL;
return params;
}
#define FIFO_INIT_SIZE 8
static av_cold int common_init(AVFilterContext *ctx)
{
BufferSinkContext *buf = ctx->priv;
buf->fifo = av_fifo_alloc(FIFO_INIT_SIZE*sizeof(AVFilterBufferRef *));
if (!buf->fifo) {
av_log(ctx, AV_LOG_ERROR, "Failed to allocate fifo\n");
return AVERROR(ENOMEM);
}
buf->warning_limit = 100;
return 0;
}
void av_buffersink_set_frame_size(AVFilterContext *ctx, unsigned frame_size)
{
AVFilterLink *inlink = ctx->inputs[0];
inlink->min_samples = inlink->max_samples =
inlink->partial_buf_size = frame_size;
}
#if FF_API_AVFILTERBUFFER
static void compat_free_buffer(AVFilterBuffer *buf)
{
AVFrame *frame = buf->priv;
av_frame_free(&frame);
av_free(buf);
}
static int compat_read(AVFilterContext *ctx, AVFilterBufferRef **pbuf, int nb_samples, int flags)
{
AVFilterBufferRef *buf;
AVFrame *frame;
int ret;
if (!pbuf)
return ff_poll_frame(ctx->inputs[0]);
frame = av_frame_alloc();
if (!frame)
return AVERROR(ENOMEM);
if (!nb_samples)
ret = av_buffersink_get_frame_flags(ctx, frame, flags);
else
ret = av_buffersink_get_samples(ctx, frame, nb_samples);
if (ret < 0)
goto fail;
if (ctx->inputs[0]->type == AVMEDIA_TYPE_VIDEO) {
buf = avfilter_get_video_buffer_ref_from_arrays(frame->data, frame->linesize,
AV_PERM_READ,
frame->width, frame->height,
frame->format);
} else {
buf = avfilter_get_audio_buffer_ref_from_arrays(frame->extended_data,
frame->linesize[0], AV_PERM_READ,
frame->nb_samples,
frame->format,
frame->channel_layout);
}
if (!buf) {
ret = AVERROR(ENOMEM);
goto fail;
}
avfilter_copy_frame_props(buf, frame);
buf->buf->priv = frame;
buf->buf->free = compat_free_buffer;
*pbuf = buf;
return 0;
fail:
av_frame_free(&frame);
return ret;
}
int av_buffersink_read(AVFilterContext *ctx, AVFilterBufferRef **buf)
{
return compat_read(ctx, buf, 0, 0);
}
int av_buffersink_read_samples(AVFilterContext *ctx, AVFilterBufferRef **buf,
int nb_samples)
{
return compat_read(ctx, buf, nb_samples, 0);
}
int av_buffersink_get_buffer_ref(AVFilterContext *ctx,
AVFilterBufferRef **bufref, int flags)
{
*bufref = NULL;
av_assert0( !strcmp(ctx->filter->name, "buffersink")
|| !strcmp(ctx->filter->name, "abuffersink")
|| !strcmp(ctx->filter->name, "ffbuffersink")
|| !strcmp(ctx->filter->name, "ffabuffersink"));
return compat_read(ctx, bufref, 0, flags);
}
#endif
AVRational av_buffersink_get_frame_rate(AVFilterContext *ctx)
{
av_assert0( !strcmp(ctx->filter->name, "buffersink")
|| !strcmp(ctx->filter->name, "ffbuffersink"));
return ctx->inputs[0]->frame_rate;
}
int av_buffersink_poll_frame(AVFilterContext *ctx)
{
BufferSinkContext *buf = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
av_assert0( !strcmp(ctx->filter->name, "buffersink")
|| !strcmp(ctx->filter->name, "abuffersink")
|| !strcmp(ctx->filter->name, "ffbuffersink")
|| !strcmp(ctx->filter->name, "ffabuffersink"));
return av_fifo_size(buf->fifo)/sizeof(AVFilterBufferRef *) + ff_poll_frame(inlink);
}
static av_cold int vsink_init(AVFilterContext *ctx, const char *args, void *opaque)
{
BufferSinkContext *buf = ctx->priv;
AVBufferSinkParams *params = opaque;
if (params && params->pixel_fmts) {
const int *pixel_fmts = params->pixel_fmts;
buf->pixel_fmts = ff_copy_int_list(pixel_fmts);
if (!buf->pixel_fmts)
return AVERROR(ENOMEM);
}
return common_init(ctx);
}
static int vsink_query_formats(AVFilterContext *ctx)
{
BufferSinkContext *buf = ctx->priv;
if (buf->pixel_fmts)
ff_set_common_formats(ctx, ff_make_format_list(buf->pixel_fmts));
else
ff_default_query_formats(ctx);
return 0;
}
static const AVFilterPad ffbuffersink_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL },
};
AVFilter avfilter_vsink_ffbuffersink = {
.name = "ffbuffersink",
.description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
.priv_size = sizeof(BufferSinkContext),
.init_opaque = vsink_init,
.uninit = uninit,
.query_formats = vsink_query_formats,
.inputs = ffbuffersink_inputs,
.outputs = NULL,
};
static const AVFilterPad buffersink_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL },
};
AVFilter avfilter_vsink_buffersink = {
.name = "buffersink",
.description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
.priv_size = sizeof(BufferSinkContext),
.init_opaque = vsink_init,
.uninit = uninit,
.query_formats = vsink_query_formats,
.inputs = buffersink_inputs,
.outputs = NULL,
};
static int64_t *concat_channels_lists(const int64_t *layouts, const int *counts)
{
int nb_layouts = 0, nb_counts = 0, i;
int64_t *list;
if (layouts)
for (; layouts[nb_layouts] != -1; nb_layouts++);
if (counts)
for (; counts[nb_counts] != -1; nb_counts++);
if (nb_counts > INT_MAX - 1 - nb_layouts)
return NULL;
if (!(list = av_calloc(nb_layouts + nb_counts + 1, sizeof(*list))))
return NULL;
for (i = 0; i < nb_layouts; i++)
list[i] = layouts[i];
for (i = 0; i < nb_counts; i++)
list[nb_layouts + i] = FF_COUNT2LAYOUT(counts[i]);
list[nb_layouts + nb_counts] = -1;
return list;
}
static av_cold int asink_init(AVFilterContext *ctx, const char *args, void *opaque)
{
BufferSinkContext *buf = ctx->priv;
AVABufferSinkParams *params = opaque;
if (params && params->sample_fmts) {
buf->sample_fmts = ff_copy_int_list(params->sample_fmts);
if (!buf->sample_fmts)
return AVERROR(ENOMEM);
}
if (params && params->sample_rates) {
buf->sample_rates = ff_copy_int_list(params->sample_rates);
if (!buf->sample_rates)
return AVERROR(ENOMEM);
}
if (params && (params->channel_layouts || params->channel_counts)) {
if (params->all_channel_counts) {
av_log(ctx, AV_LOG_ERROR,
"Conflicting all_channel_counts and list in parameters\n");
return AVERROR(EINVAL);
}
buf->channel_layouts = concat_channels_lists(params->channel_layouts,
params->channel_counts);
if (!buf->channel_layouts)
return AVERROR(ENOMEM);
}
if (params)
buf->all_channel_counts = params->all_channel_counts;
return common_init(ctx);
}
static int asink_query_formats(AVFilterContext *ctx)
{
BufferSinkContext *buf = ctx->priv;
AVFilterFormats *formats = NULL;
AVFilterChannelLayouts *layouts = NULL;
if (buf->sample_fmts) {
if (!(formats = ff_make_format_list(buf->sample_fmts)))
return AVERROR(ENOMEM);
ff_set_common_formats(ctx, formats);
}
if (buf->channel_layouts || buf->all_channel_counts) {
layouts = buf->all_channel_counts ? ff_all_channel_counts() :
avfilter_make_format64_list(buf->channel_layouts);
if (!layouts)
return AVERROR(ENOMEM);
ff_set_common_channel_layouts(ctx, layouts);
}
if (buf->sample_rates) {
formats = ff_make_format_list(buf->sample_rates);
if (!formats)
return AVERROR(ENOMEM);
ff_set_common_samplerates(ctx, formats);
}
return 0;
}
static const AVFilterPad ffabuffersink_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
},
{ NULL },
};
AVFilter avfilter_asink_ffabuffersink = {
.name = "ffabuffersink",
.description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
.init_opaque = asink_init,
.uninit = uninit,
.priv_size = sizeof(BufferSinkContext),
.query_formats = asink_query_formats,
.inputs = ffabuffersink_inputs,
.outputs = NULL,
};
static const AVFilterPad abuffersink_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
},
{ NULL },
};
AVFilter avfilter_asink_abuffersink = {
.name = "abuffersink",
.description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
.init_opaque = asink_init,
.uninit = uninit,
.priv_size = sizeof(BufferSinkContext),
.query_formats = asink_query_formats,
.inputs = abuffersink_inputs,
.outputs = NULL,
};
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