lavfi/sink_buffer: accept unknown channel layouts.

Add a field to the AVBufferSinkParams for a list of accepted
channel counts.
Change the default value for the lists in AVBufferSinkParams
to NULL, to let lavfi fill them with something useful.
The fail_enomem path is unneeded because filters are uninited
on failure.

1 files changed, 2 insertions, 0 deletions

diff --git a/libavfilter/buffersink.h b/libavfilter/buffersink.h
index a4019375d9..825a36a0a4 100644
--- a/libavfilter/buffersink.h
+++ b/libavfilter/buffersink.h
@@ -46,6 +46,8 @@ AVBufferSinkParams *av_buffersink_params_alloc(void);
 typedef struct {
     const enum AVSampleFormat *sample_fmts; ///< list of allowed sample formats, terminated by AV_SAMPLE_FMT_NONE
     const int64_t *channel_layouts;         ///< list of allowed channel layouts, terminated by -1
+    const int *channel_counts;              ///< list of allowed channel counts, terminated by -1
+    int all_channel_counts;                 ///< if not 0, accept any channel count or layout
 } AVABufferSinkParams;
 
 /**