Factorize code in get_bit_rate().

Originally committed as revision 22879 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/utils.c

@@ -781,21 +781,15 @@ static int get_bit_rate(AVCodecContext *ctx)
 
     switch(ctx->codec_type) {
     case AVMEDIA_TYPE_VIDEO:
+    case AVMEDIA_TYPE_DATA:
+    case AVMEDIA_TYPE_SUBTITLE:
+    case AVMEDIA_TYPE_ATTACHMENT:
         bit_rate = ctx->bit_rate;
         break;
     case AVMEDIA_TYPE_AUDIO:
         bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
         bit_rate = bits_per_sample ? ctx->sample_rate * ctx->channels * bits_per_sample : ctx->bit_rate;
         break;
-    case AVMEDIA_TYPE_DATA:
-        bit_rate = ctx->bit_rate;
-        break;
-    case AVMEDIA_TYPE_SUBTITLE:
-        bit_rate = ctx->bit_rate;
-        break;
-    case AVMEDIA_TYPE_ATTACHMENT:
-        bit_rate = ctx->bit_rate;
-        break;
     default:
         bit_rate = 0;
         break;