yop: set channel layout

libavformat/yop.c

@@ -22,6 +22,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/channel_layout.h"
 #include "libavutil/intreadwrite.h"
 #include "avformat.h"
 #include "internal.h"
@@ -74,6 +75,7 @@ static int yop_read_header(AVFormatContext *s)
     audio_dec->codec_type   = AVMEDIA_TYPE_AUDIO;
     audio_dec->codec_id     = AV_CODEC_ID_ADPCM_IMA_APC;
     audio_dec->channels     = 1;
+    audio_dec->channels     = AV_CH_LAYOUT_MONO;
     audio_dec->sample_rate  = 22050;
 
     // Video