Set channel layout for 4 and 5.1 channel cdata audio files

Patch from Carl Eugen Hoyos (cehoyos at ag dot or dot at)
Signed-off-by: Peter Ross <pross@xvid.org>

libavformat/eacdata.c

@@ -50,13 +50,14 @@ static int cdata_read_header(AVFormatContext *s, AVFormatParameters *ap)
     AVIOContext *pb = s->pb;
     unsigned int sample_rate, header;
     AVStream *st;
+    int64_t channel_layout = 0;
 
     header = avio_rb16(pb);
     switch (header) {
         case 0x0400: cdata->channels = 1; break;
         case 0x0404: cdata->channels = 2; break;
-        case 0x040C: cdata->channels = 4; break;
-        case 0x0414: cdata->channels = 6; break;
+        case 0x040C: cdata->channels = 4; channel_layout = AV_CH_LAYOUT_QUAD;         break;
+        case 0x0414: cdata->channels = 6; channel_layout = AV_CH_LAYOUT_5POINT1_BACK; break;
         default:
             av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header);
             return -1;
@@ -72,6 +73,7 @@ static int cdata_read_header(AVFormatContext *s, AVFormatParameters *ap)
     st->codec->codec_tag = 0; /* no fourcc */
     st->codec->codec_id = CODEC_ID_ADPCM_EA_XAS;
     st->codec->channels = cdata->channels;
+    st->codec->channel_layout = channel_layout;
     st->codec->sample_rate = sample_rate;
     st->codec->sample_fmt = AV_SAMPLE_FMT_S16;
     av_set_pts_info(st, 64, 1, sample_rate);