ffmpeg: add -map_channel option.

Based on an initial work by Baptiste Coudurier.

1 files changed, 2 insertions, 0 deletions

diff --git a/libswresample/swresample_internal.h b/libswresample/swresample_internal.h
index 4678886bdb..4764ddfd6f 100644
--- a/libswresample/swresample_internal.h
+++ b/libswresample/swresample_internal.h
@@ -45,6 +45,8 @@ typedef struct SwrContext {          //FIXME find unused fields
     int     out_sample_rate;
     int flags;
     float slev, clev, rematrix_volume;
+    const int *channel_map;             ///< channel index (or -1 if muted channel) map
+    int used_ch_count;                  ///< number of used channels (mapped channel count if channel_map, otherwise in.ch_count)
 
     //below are private
     int int_bps;