Set channel_layout

Originally committed as revision 15843 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/cook.c

@@ -1177,6 +1177,7 @@ static int cook_decode_init(AVCodecContext *avctx)
     }
 
     avctx->sample_fmt = SAMPLE_FMT_S16;
+    avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
 
 #ifdef COOKDEBUG
     dump_cook_context(q);

libavcodec/imc.c

@@ -155,6 +155,7 @@ static av_cold int imc_decode_init(AVCodecContext * avctx)
     ff_fft_init(&q->fft, 7, 1);
     dsputil_init(&q->dsp, avctx);
     avctx->sample_fmt = SAMPLE_FMT_S16;
+    avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
     return 0;
 }
 

libavcodec/nellymoserdec.c

@@ -148,6 +148,7 @@ static av_cold int decode_init(AVCodecContext * avctx) {
         ff_sine_window_init(sine_window, 128);
 
     avctx->sample_fmt = SAMPLE_FMT_S16;
+    avctx->channel_layout = CH_LAYOUT_MONO;
     return 0;
 }