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vsink_buffer: make the buffer cache all the incoming frames

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Allow to cache more than one frame (e.g. for filters which return
more than one frame when avfilter_request_frame() is called on them),
and do not discard previously cached frames when a new one is added.
This commit is contained in:
Stefano Sabatini 2011-06-29 17:31:16 +02:00
parent 2e81bb5e92
commit 3560089e12
2 changed files with 40 additions and 13 deletions
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2
libavfilter/avfilter.h
View File

@ -30,7 +30,7 @@
#define LIBAVFILTER_VERSION_MAJOR 2
#define LIBAVFILTER_VERSION_MINOR 29
#define LIBAVFILTER_VERSION_MICRO 1
#define LIBAVFILTER_VERSION_MICRO 2
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

51
libavfilter/vsink_buffer.c
View File

@ -23,14 +23,17 @@
* buffer video sink
*/
#include "libavutil/fifo.h"
#include "avfilter.h"
#include "vsink_buffer.h"
typedef struct {
AVFilterBufferRef *picref; ///< cached picref
AVFifoBuffer *fifo; ///< FIFO buffer of video frame references
enum PixelFormat *pix_fmts; ///< accepted pixel formats, must be terminated with -1
} BufferSinkContext;
#define FIFO_INIT_SIZE 8
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
BufferSinkContext *buf = ctx->priv;
@ -40,6 +43,12 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
return AVERROR(EINVAL);
}
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->pix_fmts = opaque;
return 0;
}
@ -47,19 +56,36 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
static av_cold void uninit(AVFilterContext *ctx)
{
BufferSinkContext *buf = ctx->priv;
AVFilterBufferRef *picref;
if (buf->picref)
avfilter_unref_buffer(buf->picref);
buf->picref = NULL;
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 (buf->picref) /* drop the last cached frame */
avfilter_unref_buffer(buf->picref);
buf->picref = inlink->cur_buf;
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);
}
static int query_formats(AVFilterContext *ctx)
@ -79,17 +105,18 @@ int av_vsink_buffer_get_video_buffer_ref(AVFilterContext *ctx,
*picref = NULL;
/* no picref available, fetch it from the filterchain */
if (!buf->picref) {
if (!av_fifo_size(buf->fifo)) {
if ((ret = avfilter_request_frame(inlink)) < 0)
return ret;
}
if (!buf->picref)
if (!av_fifo_size(buf->fifo))
return AVERROR(EINVAL);
*picref = buf->picref;
if (!(flags & AV_VSINK_BUF_FLAG_PEEK))
buf->picref = NULL;
if (flags & AV_VSINK_BUF_FLAG_PEEK)
*picref = (AVFilterBufferRef *)av_fifo_peek2(buf->fifo, 0);
else
av_fifo_generic_read(buf->fifo, picref, sizeof(*picref), NULL);
return 0;
}