lavfi: implement samples framing on links.

Links can be set up to group samples into buffers of
specified minimum and maximum size.

1 files changed, 26 insertions, 0 deletions

diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index b679635805..e08a389275 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -590,6 +590,32 @@ struct AVFilterLink {
      * It is similar to the r_frae_rate field in AVStream.
      */
     AVRational frame_rate;
+
+    /**
+     * Buffer partially filled with samples to achieve a fixed/minimum size.
+     */
+    AVFilterBufferRef *partial_buf;
+
+    /**
+     * Size of the partial buffer to allocate.
+     * Must be between min_samples and max_samples.
+     */
+    int partial_buf_size;
+
+    /**
+     * Minimum number of samples to filter at once. If filter_samples() is
+     * called with fewer samples, it will accumulate them in partial_buf.
+     * This field and the related ones must not be changed after filtering
+     * has started.
+     * If 0, all related fields are ignored.
+     */
+    int min_samples;
+
+    /**
+     * Maximum number of samples to filter at once. If filter_samples() is
+     * called with more samples, it will split them.
+     */
+    int max_samples;
 };
 
 /**