ffmpeg: add -map_channel option.

Based on an initial work by Baptiste Coudurier.

1 files changed, 4 insertions, 1 deletions

diff --git a/libswresample/audioconvert.h b/libswresample/audioconvert.h
index e5fd4dfd80..ca98d549d9 100644
--- a/libswresample/audioconvert.h
+++ b/libswresample/audioconvert.h
@@ -42,11 +42,14 @@ typedef struct AVAudioConvert AVAudioConvert;
  * @param in_fmt Input sample format
  * @param channels Number of channels
  * @param flags See AV_CPU_FLAG_xx
+ * @param ch_map list of the channels id to pick from the source stream, NULL
+ *               if all channels must be selected
  * @return NULL on error
  */
 AVAudioConvert *swr_audio_convert_alloc(enum AVSampleFormat out_fmt,
                                         enum AVSampleFormat in_fmt,
-                                        int channels, int flags);
+                                        int channels, const int *ch_map,
+                                        int flags);
 
 /**
  * Free audio sample format converter context.