buffersink: add av_buffersink_get_frame_rate().

2 files changed, 10 insertions, 0 deletions

diff --git a/libavfilter/buffersink.h b/libavfilter/buffersink.h
index 46de82be6d..97729bc7a9 100644
--- a/libavfilter/buffersink.h
+++ b/libavfilter/buffersink.h
@@ -133,4 +133,9 @@ int av_buffersink_read(AVFilterContext *sink, AVFilterBufferRef **buf);
 int av_buffersink_read_samples(AVFilterContext *ctx, AVFilterBufferRef **buf,
                                int nb_samples);
 
+/**
+ * Get the frame rate of the input.
+ */
+AVRational av_buffersink_get_frame_rate(AVFilterContext *ctx);
+
 #endif /* AVFILTER_BUFFERSINK_H */
diff --git a/libavfilter/sink_buffer.c b/libavfilter/sink_buffer.c
index d83f21ba61..d1a72e4081 100644
--- a/libavfilter/sink_buffer.c
+++ b/libavfilter/sink_buffer.c
@@ -142,6 +142,11 @@ int av_buffersink_get_buffer_ref(AVFilterContext *ctx,
     return 0;
 }
 
+AVRational av_buffersink_get_frame_rate(AVFilterContext *ctx)
+{
+    return ctx->inputs[0]->frame_rate;
+}
+
 int av_buffersink_poll_frame(AVFilterContext *ctx)
 {
     BufferSinkContext *buf = ctx->priv;