lavfi: allow audio filters to request a given number of samples.

This makes synchronization simpler for filters with multiple inputs.

1 files changed, 9 insertions, 0 deletions

diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index c92f7e14d4..f09f0869f4 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -595,6 +595,15 @@ struct AVFilterLink {
     AVFilterFormats *out_samplerates;
     struct AVFilterChannelLayouts  *in_channel_layouts;
     struct AVFilterChannelLayouts *out_channel_layouts;
+
+    /**
+     * Audio only, the destination filter sets this to a non-zero value to
+     * request that buffers with the given number of samples should be sent to
+     * it. AVFilterPad.needs_fifo must also be set on the corresponding input
+     * pad.
+     * Last buffer before EOF will be padded with silence.
+     */
+    int request_samples;
 };
 
 /**