libavfilter/buffersink.c - nest-android-app/ffmpeg - Git at Google

 /*
  * 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/internal.h"
 #include "libavutil/mathematics.h"
 #include "libavutil/opt.h"

 #include "audio.h"
 #include "avfilter.h"
 #include "buffersink.h"
 #include "internal.h"

 typedef struct BufferSinkContext {
     const AVClass *class;
     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
     int pixel_fmts_size;

     /* only used for audio */
     enum AVSampleFormat *sample_fmts;       ///< list of accepted sample formats, terminated by AV_SAMPLE_FMT_NONE
     int sample_fmts_size;
     int64_t *channel_layouts;               ///< list of accepted channel layouts, terminated by -1
     int channel_layouts_size;
     int *channel_counts;                    ///< list of accepted channel counts, terminated by -1
     int channel_counts_size;
     int all_channel_counts;
     int *sample_rates;                      ///< list of accepted sample rates, terminated by -1
     int sample_rates_size;

     /* only used for compat API */
     AVAudioFifo *audio_fifo;     ///< FIFO for audio samples
     int64_t next_pts;            ///< interpolating audio pts
 } BufferSinkContext;

 #define NB_ITEMS(list) (list ## _size / sizeof(*list))
 #define FIFO_INIT_SIZE 8
 #define FIFO_INIT_ELEMENT_SIZE sizeof(void *)

 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) >= FIFO_INIT_ELEMENT_SIZE) {
             av_fifo_generic_read(sink->fifo, &frame, sizeof(frame), NULL);
             av_frame_free(&frame);
         }
         av_fifo_freep(&sink->fifo);
     }
 }

 static int add_buffer_ref(AVFilterContext *ctx, AVFrame *ref)
 {
     BufferSinkContext *buf = ctx->priv;

     if (av_fifo_space(buf->fifo) < FIFO_INIT_ELEMENT_SIZE) {
         /* 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, FIFO_INIT_ELEMENT_SIZE, 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) / FIFO_INIT_ELEMENT_SIZE >= 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 attribute_align_arg av_buffersink_get_frame(AVFilterContext *ctx, AVFrame *frame)
 {
     return av_buffersink_get_frame_flags(ctx, frame, 0);
 }

 int attribute_align_arg 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 */
     while (!av_fifo_size(buf->fifo)) {
         if (inlink->status)
             return inlink->status;
         if (flags & AV_BUFFERSINK_FLAG_NO_REQUEST)
             return AVERROR(EAGAIN);
         if ((ret = ff_request_frame(inlink)) < 0)
             return ret;
         while (inlink->frame_wanted_out) {
             ret = ff_filter_graph_run_once(ctx->graph);
             if (ret < 0)
                 return ret;
         }
     }

     if (flags & AV_BUFFERSINK_FLAG_PEEK) {
         cur_frame = *((AVFrame **)av_fifo_peek2(buf->fifo, 0));
         if ((ret = av_frame_ref(frame, cur_frame)) < 0)
             return ret;
     } 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;
     if (s->next_pts != AV_NOPTS_VALUE)
         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 attribute_align_arg 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;
 }

 static av_cold int common_init(AVFilterContext *ctx)
 {
     BufferSinkContext *buf = ctx->priv;

     buf->fifo = av_fifo_alloc_array(FIFO_INIT_SIZE, FIFO_INIT_ELEMENT_SIZE);
     if (!buf->fifo) {
         av_log(ctx, AV_LOG_ERROR, "Failed to allocate fifo\n");
         return AVERROR(ENOMEM);
     }
     buf->warning_limit = 100;
     buf->next_pts = AV_NOPTS_VALUE;
     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;
 }

 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;
 }

 static av_cold int vsink_init(AVFilterContext *ctx, void *opaque)
 {
     BufferSinkContext *buf = ctx->priv;
     AVBufferSinkParams *params = opaque;
     int ret;

     if (params) {
         if ((ret = av_opt_set_int_list(buf, "pix_fmts", params->pixel_fmts, AV_PIX_FMT_NONE, 0)) < 0)
             return ret;
     }

     return common_init(ctx);
 }

 #define CHECK_LIST_SIZE(field) \
         if (buf->field ## _size % sizeof(*buf->field)) { \
             av_log(ctx, AV_LOG_ERROR, "Invalid size for " #field ": %d, " \
                    "should be multiple of %d\n", \
                    buf->field ## _size, (int)sizeof(*buf->field)); \
             return AVERROR(EINVAL); \
         }
 static int vsink_query_formats(AVFilterContext *ctx)
 {
     BufferSinkContext *buf = ctx->priv;
     AVFilterFormats *formats = NULL;
     unsigned i;
     int ret;

     CHECK_LIST_SIZE(pixel_fmts)
     if (buf->pixel_fmts_size) {
         for (i = 0; i < NB_ITEMS(buf->pixel_fmts); i++)
             if ((ret = ff_add_format(&formats, buf->pixel_fmts[i])) < 0)
                 return ret;
         if ((ret = ff_set_common_formats(ctx, formats)) < 0)
             return ret;
     } else {
         if ((ret = ff_default_query_formats(ctx)) < 0)
             return ret;
     }

     return 0;
 }

 static av_cold int asink_init(AVFilterContext *ctx, void *opaque)
 {
     BufferSinkContext *buf = ctx->priv;
     AVABufferSinkParams *params = opaque;
     int ret;

     if (params) {
         if ((ret = av_opt_set_int_list(buf, "sample_fmts",     params->sample_fmts,  AV_SAMPLE_FMT_NONE, 0)) < 0 ||
             (ret = av_opt_set_int_list(buf, "sample_rates",    params->sample_rates,    -1, 0)) < 0 ||
             (ret = av_opt_set_int_list(buf, "channel_layouts", params->channel_layouts, -1, 0)) < 0 ||
             (ret = av_opt_set_int_list(buf, "channel_counts",  params->channel_counts,  -1, 0)) < 0 ||
             (ret = av_opt_set_int(buf, "all_channel_counts", params->all_channel_counts, 0)) < 0)
             return ret;
     }
     return common_init(ctx);
 }

 static int asink_query_formats(AVFilterContext *ctx)
 {
     BufferSinkContext *buf = ctx->priv;
     AVFilterFormats *formats = NULL;
     AVFilterChannelLayouts *layouts = NULL;
     unsigned i;
     int ret;

     CHECK_LIST_SIZE(sample_fmts)
     CHECK_LIST_SIZE(sample_rates)
     CHECK_LIST_SIZE(channel_layouts)
     CHECK_LIST_SIZE(channel_counts)

     if (buf->sample_fmts_size) {
         for (i = 0; i < NB_ITEMS(buf->sample_fmts); i++)
             if ((ret = ff_add_format(&formats, buf->sample_fmts[i])) < 0)
                 return ret;
         if ((ret = ff_set_common_formats(ctx, formats)) < 0)
             return ret;
     }

     if (buf->channel_layouts_size || buf->channel_counts_size ||
         buf->all_channel_counts) {
         for (i = 0; i < NB_ITEMS(buf->channel_layouts); i++)
             if ((ret = ff_add_channel_layout(&layouts, buf->channel_layouts[i])) < 0)
                 return ret;
         for (i = 0; i < NB_ITEMS(buf->channel_counts); i++)
             if ((ret = ff_add_channel_layout(&layouts, FF_COUNT2LAYOUT(buf->channel_counts[i]))) < 0)
                 return ret;
         if (buf->all_channel_counts) {
             if (layouts)
                 av_log(ctx, AV_LOG_WARNING,
                        "Conflicting all_channel_counts and list in options\n");
             else if (!(layouts = ff_all_channel_counts()))
                 return AVERROR(ENOMEM);
         }
         if ((ret = ff_set_common_channel_layouts(ctx, layouts)) < 0)
             return ret;
     }

     if (buf->sample_rates_size) {
         formats = NULL;
         for (i = 0; i < NB_ITEMS(buf->sample_rates); i++)
             if ((ret = ff_add_format(&formats, buf->sample_rates[i])) < 0)
                 return ret;
         if ((ret = ff_set_common_samplerates(ctx, formats)) < 0)
             return ret;
     }

     return 0;
 }

 #define OFFSET(x) offsetof(BufferSinkContext, x)
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
 static const AVOption buffersink_options[] = {
     { "pix_fmts", "set the supported pixel formats", OFFSET(pixel_fmts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
     { NULL },
 };
 #undef FLAGS
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
 static const AVOption abuffersink_options[] = {
     { "sample_fmts",     "set the supported sample formats",  OFFSET(sample_fmts),     AV_OPT_TYPE_BINARY, .flags = FLAGS },
     { "sample_rates",    "set the supported sample rates",    OFFSET(sample_rates),    AV_OPT_TYPE_BINARY, .flags = FLAGS },
     { "channel_layouts", "set the supported channel layouts", OFFSET(channel_layouts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
     { "channel_counts",  "set the supported channel counts",  OFFSET(channel_counts),  AV_OPT_TYPE_BINARY, .flags = FLAGS },
     { "all_channel_counts", "accept all channel counts", OFFSET(all_channel_counts), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
     { NULL },
 };
 #undef FLAGS

 AVFILTER_DEFINE_CLASS(buffersink);
 AVFILTER_DEFINE_CLASS(abuffersink);

 static const AVFilterPad avfilter_vsink_buffer_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = filter_frame,
     },
     { NULL }
 };

 AVFilter ff_vsink_buffer = {
     .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),
     .priv_class  = &buffersink_class,
     .init_opaque = vsink_init,
     .uninit      = uninit,

     .query_formats = vsink_query_formats,
     .inputs      = avfilter_vsink_buffer_inputs,
     .outputs     = NULL,
 };

 static const AVFilterPad avfilter_asink_abuffer_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_AUDIO,
         .filter_frame = filter_frame,
     },
     { NULL }
 };

 AVFilter ff_asink_abuffer = {
     .name        = "abuffersink",
     .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
     .priv_class  = &abuffersink_class,
     .priv_size   = sizeof(BufferSinkContext),
     .init_opaque = asink_init,
     .uninit      = uninit,

     .query_formats = asink_query_formats,
     .inputs      = avfilter_asink_abuffer_inputs,
     .outputs     = NULL,
 };
	/*
	* 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/internal.h"
	#include "libavutil/mathematics.h"
	#include "libavutil/opt.h"

	#include "audio.h"
	#include "avfilter.h"
	#include "buffersink.h"
	#include "internal.h"

	typedef struct BufferSinkContext {
	const AVClass *class;
	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
	int pixel_fmts_size;

	/* only used for audio */
	enum AVSampleFormat *sample_fmts; ///< list of accepted sample formats, terminated by AV_SAMPLE_FMT_NONE
	int sample_fmts_size;
	int64_t *channel_layouts; ///< list of accepted channel layouts, terminated by -1
	int channel_layouts_size;
	int *channel_counts; ///< list of accepted channel counts, terminated by -1
	int channel_counts_size;
	int all_channel_counts;
	int *sample_rates; ///< list of accepted sample rates, terminated by -1
	int sample_rates_size;

	/* only used for compat API */
	AVAudioFifo *audio_fifo; ///< FIFO for audio samples
	int64_t next_pts; ///< interpolating audio pts
	} BufferSinkContext;

	#define NB_ITEMS(list) (list ## _size / sizeof(*list))
	#define FIFO_INIT_SIZE 8
	#define FIFO_INIT_ELEMENT_SIZE sizeof(void *)

	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) >= FIFO_INIT_ELEMENT_SIZE) {
	av_fifo_generic_read(sink->fifo, &frame, sizeof(frame), NULL);
	av_frame_free(&frame);
	}
	av_fifo_freep(&sink->fifo);
	}
	}

	static int add_buffer_ref(AVFilterContext ctx, AVFrame ref)
	{
	BufferSinkContext *buf = ctx->priv;

	if (av_fifo_space(buf->fifo) < FIFO_INIT_ELEMENT_SIZE) {
	/* 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, FIFO_INIT_ELEMENT_SIZE, 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) / FIFO_INIT_ELEMENT_SIZE >= 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 attribute_align_arg av_buffersink_get_frame(AVFilterContext ctx, AVFrame frame)
	{
	return av_buffersink_get_frame_flags(ctx, frame, 0);
	}

	int attribute_align_arg 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 */
	while (!av_fifo_size(buf->fifo)) {
	if (inlink->status)
	return inlink->status;
	if (flags & AV_BUFFERSINK_FLAG_NO_REQUEST)
	return AVERROR(EAGAIN);
	if ((ret = ff_request_frame(inlink)) < 0)
	return ret;
	while (inlink->frame_wanted_out) {
	ret = ff_filter_graph_run_once(ctx->graph);
	if (ret < 0)
	return ret;
	}
	}

	if (flags & AV_BUFFERSINK_FLAG_PEEK) {
	cur_frame = ((AVFrame *)av_fifo_peek2(buf->fifo, 0));
	if ((ret = av_frame_ref(frame, cur_frame)) < 0)
	return ret;
	} 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;
	if (s->next_pts != AV_NOPTS_VALUE)
	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 attribute_align_arg 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;
	}

	static av_cold int common_init(AVFilterContext *ctx)
	{
	BufferSinkContext *buf = ctx->priv;

	buf->fifo = av_fifo_alloc_array(FIFO_INIT_SIZE, FIFO_INIT_ELEMENT_SIZE);
	if (!buf->fifo) {
	av_log(ctx, AV_LOG_ERROR, "Failed to allocate fifo\n");
	return AVERROR(ENOMEM);
	}
	buf->warning_limit = 100;
	buf->next_pts = AV_NOPTS_VALUE;
	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;
	}

	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;
	}

	static av_cold int vsink_init(AVFilterContext ctx, void opaque)
	{
	BufferSinkContext *buf = ctx->priv;
	AVBufferSinkParams *params = opaque;
	int ret;

	if (params) {
	if ((ret = av_opt_set_int_list(buf, "pix_fmts", params->pixel_fmts, AV_PIX_FMT_NONE, 0)) < 0)
	return ret;
	}

	return common_init(ctx);
	}

	#define CHECK_LIST_SIZE(field) \
	if (buf->field ## _size % sizeof(*buf->field)) { \
	av_log(ctx, AV_LOG_ERROR, "Invalid size for " #field ": %d, " \
	"should be multiple of %d\n", \
	buf->field ## _size, (int)sizeof(*buf->field)); \
	return AVERROR(EINVAL); \
	}
	static int vsink_query_formats(AVFilterContext *ctx)
	{
	BufferSinkContext *buf = ctx->priv;
	AVFilterFormats *formats = NULL;
	unsigned i;
	int ret;

	CHECK_LIST_SIZE(pixel_fmts)
	if (buf->pixel_fmts_size) {
	for (i = 0; i < NB_ITEMS(buf->pixel_fmts); i++)
	if ((ret = ff_add_format(&formats, buf->pixel_fmts[i])) < 0)
	return ret;
	if ((ret = ff_set_common_formats(ctx, formats)) < 0)
	return ret;
	} else {
	if ((ret = ff_default_query_formats(ctx)) < 0)
	return ret;
	}

	return 0;
	}

	static av_cold int asink_init(AVFilterContext ctx, void opaque)
	{
	BufferSinkContext *buf = ctx->priv;
	AVABufferSinkParams *params = opaque;
	int ret;

	if (params) {
	if ((ret = av_opt_set_int_list(buf, "sample_fmts", params->sample_fmts, AV_SAMPLE_FMT_NONE, 0)) < 0 \|\|
	(ret = av_opt_set_int_list(buf, "sample_rates", params->sample_rates, -1, 0)) < 0 \|\|
	(ret = av_opt_set_int_list(buf, "channel_layouts", params->channel_layouts, -1, 0)) < 0 \|\|
	(ret = av_opt_set_int_list(buf, "channel_counts", params->channel_counts, -1, 0)) < 0 \|\|
	(ret = av_opt_set_int(buf, "all_channel_counts", params->all_channel_counts, 0)) < 0)
	return ret;
	}
	return common_init(ctx);
	}

	static int asink_query_formats(AVFilterContext *ctx)
	{
	BufferSinkContext *buf = ctx->priv;
	AVFilterFormats *formats = NULL;
	AVFilterChannelLayouts *layouts = NULL;
	unsigned i;
	int ret;

	CHECK_LIST_SIZE(sample_fmts)
	CHECK_LIST_SIZE(sample_rates)
	CHECK_LIST_SIZE(channel_layouts)
	CHECK_LIST_SIZE(channel_counts)

	if (buf->sample_fmts_size) {
	for (i = 0; i < NB_ITEMS(buf->sample_fmts); i++)
	if ((ret = ff_add_format(&formats, buf->sample_fmts[i])) < 0)
	return ret;
	if ((ret = ff_set_common_formats(ctx, formats)) < 0)
	return ret;
	}

	if (buf->channel_layouts_size \|\| buf->channel_counts_size \|\|
	buf->all_channel_counts) {
	for (i = 0; i < NB_ITEMS(buf->channel_layouts); i++)
	if ((ret = ff_add_channel_layout(&layouts, buf->channel_layouts[i])) < 0)
	return ret;
	for (i = 0; i < NB_ITEMS(buf->channel_counts); i++)
	if ((ret = ff_add_channel_layout(&layouts, FF_COUNT2LAYOUT(buf->channel_counts[i]))) < 0)
	return ret;
	if (buf->all_channel_counts) {
	if (layouts)
	av_log(ctx, AV_LOG_WARNING,
	"Conflicting all_channel_counts and list in options\n");
	else if (!(layouts = ff_all_channel_counts()))
	return AVERROR(ENOMEM);
	}
	if ((ret = ff_set_common_channel_layouts(ctx, layouts)) < 0)
	return ret;
	}

	if (buf->sample_rates_size) {
	formats = NULL;
	for (i = 0; i < NB_ITEMS(buf->sample_rates); i++)
	if ((ret = ff_add_format(&formats, buf->sample_rates[i])) < 0)
	return ret;
	if ((ret = ff_set_common_samplerates(ctx, formats)) < 0)
	return ret;
	}

	return 0;
	}

	#define OFFSET(x) offsetof(BufferSinkContext, x)
	#define FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM
	static const AVOption buffersink_options[] = {
	{ "pix_fmts", "set the supported pixel formats", OFFSET(pixel_fmts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
	{ NULL },
	};
	#undef FLAGS
	#define FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM
	static const AVOption abuffersink_options[] = {
	{ "sample_fmts", "set the supported sample formats", OFFSET(sample_fmts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
	{ "sample_rates", "set the supported sample rates", OFFSET(sample_rates), AV_OPT_TYPE_BINARY, .flags = FLAGS },
	{ "channel_layouts", "set the supported channel layouts", OFFSET(channel_layouts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
	{ "channel_counts", "set the supported channel counts", OFFSET(channel_counts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
	{ "all_channel_counts", "accept all channel counts", OFFSET(all_channel_counts), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
	{ NULL },
	};
	#undef FLAGS

	AVFILTER_DEFINE_CLASS(buffersink);
	AVFILTER_DEFINE_CLASS(abuffersink);

	static const AVFilterPad avfilter_vsink_buffer_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.filter_frame = filter_frame,
	},
	{ NULL }
	};

	AVFilter ff_vsink_buffer = {
	.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),
	.priv_class = &buffersink_class,
	.init_opaque = vsink_init,
	.uninit = uninit,

	.query_formats = vsink_query_formats,
	.inputs = avfilter_vsink_buffer_inputs,
	.outputs = NULL,
	};

	static const AVFilterPad avfilter_asink_abuffer_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_AUDIO,
	.filter_frame = filter_frame,
	},
	{ NULL }
	};

	AVFilter ff_asink_abuffer = {
	.name = "abuffersink",
	.description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
	.priv_class = &abuffersink_class,
	.priv_size = sizeof(BufferSinkContext),
	.init_opaque = asink_init,
	.uninit = uninit,

	.query_formats = asink_query_formats,
	.inputs = avfilter_asink_abuffer_inputs,
	.outputs = NULL,
	};