Add channel layout to several audio decoders I maintain

Originally committed as revision 15884 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/apedec.c

@@ -199,6 +199,7 @@ static av_cold int ape_decode_init(AVCodecContext * avctx)
 
     dsputil_init(&s->dsp, avctx);
     avctx->sample_fmt = SAMPLE_FMT_S16;
+    avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
     return 0;
 }
 

libavcodec/mpc7.c

@@ -109,6 +109,7 @@ static av_cold int mpc7_decode_init(AVCodecContext * avctx)
     }
     vlc_initialized = 1;
     avctx->sample_fmt = SAMPLE_FMT_S16;
+    avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
     return 0;
 }
 

libavcodec/mpc8.c

@@ -178,6 +178,7 @@ static av_cold int mpc8_decode_init(AVCodecContext * avctx)
     }
     vlc_initialized = 1;
     avctx->sample_fmt = SAMPLE_FMT_S16;
+    avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
     return 0;
 }
 

libavcodec/smacker.c

@@ -559,6 +559,7 @@ static av_cold int decode_end(AVCodecContext *avctx)
 static av_cold int smka_decode_init(AVCodecContext *avctx)
 {
     avctx->sample_fmt = SAMPLE_FMT_S16;
+    avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
     return 0;
 }
 

libavcodec/wavpack.c

@@ -361,6 +361,7 @@ static av_cold int wavpack_decode_init(AVCodecContext *avctx)
     s->avctx = avctx;
     s->stereo = (avctx->channels == 2);
     avctx->sample_fmt = SAMPLE_FMT_S16;
+    avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
 
     return 0;
 }