@@ -29,7 +29,7 @@

 #include "libavutil/rational.h"

 #define LIBAVFILTER_VERSION_MAJOR  2

-#define LIBAVFILTER_VERSION_MINOR 51

+#define LIBAVFILTER_VERSION_MINOR 52

 #define LIBAVFILTER_VERSION_MICRO  0

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

@@ -76,6 +76,12 @@ AVABufferSinkParams *av_abuffersink_params_alloc(void);

 int av_buffersink_get_buffer_ref(AVFilterContext *buffer_sink,

                                  AVFilterBufferRef **bufref, int flags);

+

+/**

+ * Get the number of immediately available frames.

+ */

+int av_buffersink_poll_frame(AVFilterContext *ctx);

+

 #if FF_API_OLD_VSINK_API

 /**

  * @deprecated Use av_buffersink_get_buffer_ref() instead.

@@ -140,6 +140,14 @@ int av_buffersink_get_buffer_ref(AVFilterContext *ctx,

     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)