/*
* 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 video sink
*/
#include "libavutil/fifo.h"
#include "avfilter.h"
#include "buffersink.h"
AVBufferSinkParams *av_buffersink_params_alloc(void)
{
static const int pixel_fmts[] = { -1 };
AVBufferSinkParams *params = av_malloc(sizeof(AVBufferSinkParams));
if (!params)
return NULL;
params->pixel_fmts = pixel_fmts;
return params;
}
AVABufferSinkParams *av_abuffersink_params_alloc(void)
{
static const int sample_fmts[] = { -1 };
static const int packing_fmts[] = { -1 };
static const int64_t channel_layouts[] = { -1 };
AVABufferSinkParams *params = av_malloc(sizeof(AVABufferSinkParams));
if (!params)
return NULL;
params->sample_fmts = sample_fmts;
params->channel_layouts = channel_layouts;
params->packing_fmts = packing_fmts;
return params;
}
typedef struct {
AVFifoBuffer *fifo; ///< FIFO buffer of video frame references
/* only used for video */
const enum PixelFormat *pixel_fmts; ///< list of accepted pixel formats, must be terminated with -1
/* only used for audio */
const enum AVSampleFormat *sample_fmts; ///< list of accepted sample formats, terminated by AV_SAMPLE_FMT_NONE
const int64_t *channel_layouts; ///< list of accepted channel layouts, terminated by -1
const int *packing_fmts; ///< list of accepted packing formats, terminated by -1
} BufferSinkContext;
#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);
}
return 0;
}
static av_cold void common_uninit(AVFilterContext *ctx)
{
BufferSinkContext *buf = ctx->priv;
AVFilterBufferRef *picref;
if (buf->fifo) {
while (av_fifo_size(buf->fifo) >= sizeof(AVFilterBufferRef *)) {
av_fifo_generic_read(buf->fifo, &picref, sizeof(picref), NULL);
avfilter_unref_buffer(picref);
}
av_fifo_free(buf->fifo);
buf->fifo = NULL;
}
}
static void end_frame(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
BufferSinkContext *buf = inlink->dst->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;
}
}
/* cache frame */
av_fifo_generic_write(buf->fifo,
&inlink->cur_buf, sizeof(AVFilterBufferRef *), NULL);
}
int av_buffersink_get_buffer_ref(AVFilterContext *ctx,
AVFilterBufferRef **bufref, int flags)
{
BufferSinkContext *buf = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
int ret;
*bufref = NULL;
/* no picref available, fetch it from the filterchain */
if (!av_fifo_size(buf->fifo)) {
if ((ret = avfilter_request_frame(inlink)) < 0)
return ret;
}
if (!av_fifo_size(buf->fifo))
return AVERROR(EINVAL);
if (flags & AV_BUFFERSINK_FLAG_PEEK)
*bufref = *((AVFilterBufferRef **)av_fifo_peek2(buf->fifo, 0));
else
av_fifo_generic_read(buf->fifo, bufref, sizeof(*bufref), NULL);
return 0;
}
int av_buffersink_poll_frame(AVFilterContext *ctx)
{
BufferSinkContext *buf = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
return av_fifo_size(buf->fifo)/sizeof(AVFilterBufferRef *) + avfilter_poll_frame(inlink);
}
#if FF_API_OLD_VSINK_API
int av_vsink_buffer_get_video_buffer_ref(AVFilterContext *ctx,
AVFilterBufferRef **picref, int flags)
{
return av_buffersink_get_buffer_ref(ctx, picref, flags);
}
#endif
#if CONFIG_BUFFERSINK_FILTER
static av_cold int vsink_init(AVFilterContext *ctx, const char *args, void *opaque)
{
BufferSinkContext *buf = ctx->priv;
av_unused AVBufferSinkParams *params;
if (!opaque) {
av_log(ctx, AV_LOG_ERROR,
"No opaque field provided\n");
return AVERROR(EINVAL);
} else {
#if FF_API_OLD_VSINK_API
buf->pixel_fmts = (const enum PixelFormat *)opaque;
#else
params = (AVBufferSinkParams *)opaque;
buf->pixel_fmts = params->pixel_fmts;
#endif
}
return common_init(ctx);
}
static int vsink_query_formats(AVFilterContext *ctx)
{
BufferSinkContext *buf = ctx->priv;
avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(buf->pixel_fmts));
return 0;
}
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 = vsink_init,
.uninit = common_uninit,
.query_formats = vsink_query_formats,
.inputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.end_frame = end_frame,
.min_perms = AV_PERM_READ, },
{ .name = NULL }},
.outputs = (const AVFilterPad[]) {{ .name = NULL }},
};
#endif /* CONFIG_BUFFERSINK_FILTER */
#if CONFIG_ABUFFERSINK_FILTER
static void filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
{
end_frame(link);
}
static av_cold int asink_init(AVFilterContext *ctx, const char *args, void *opaque)
{
BufferSinkContext *buf = ctx->priv;
AVABufferSinkParams *params;
if (!opaque) {
av_log(ctx, AV_LOG_ERROR,
"No opaque field provided, an AVABufferSinkParams struct is required\n");
return AVERROR(EINVAL);
} else
params = (AVABufferSinkParams *)opaque;
buf->sample_fmts = params->sample_fmts;
buf->channel_layouts = params->channel_layouts;
buf->packing_fmts = params->packing_fmts;
return common_init(ctx);
}
static int asink_query_formats(AVFilterContext *ctx)
{
BufferSinkContext *buf = ctx->priv;
AVFilterFormats *formats = NULL;
if (!(formats = avfilter_make_format_list(buf->sample_fmts)))
return AVERROR(ENOMEM);
avfilter_set_common_sample_formats(ctx, formats);
if (!(formats = avfilter_make_format64_list(buf->channel_layouts)))
return AVERROR(ENOMEM);
avfilter_set_common_channel_layouts(ctx, formats);
if (!(formats = avfilter_make_format_list(buf->packing_fmts)))
return AVERROR(ENOMEM);
avfilter_set_common_packing_formats(ctx, formats);
return 0;
}
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 = asink_init,
.uninit = common_uninit,
.priv_size = sizeof(BufferSinkContext),
.query_formats = asink_query_formats,
.inputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_samples = filter_samples,
.min_perms = AV_PERM_READ, },
{ .name = NULL }},
.outputs = (const AVFilterPad[]) {{ .name = NULL }},
};
#endif /* CONFIG_ABUFFERSINK_FILTER */