* 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;
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;
}
static av_cold void uninit(AVFilterContext *ctx)
{
BufferSinkContext *buf = ctx->priv;
-
- if (buf->picref)
- avfilter_unref_buffer(buf->picref);
- buf->picref = NULL;
+ 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 (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)
*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;
}