Define AVMediaType enum, and use it instead of enum CodecType, which

is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/au.c

@@ -148,7 +148,7 @@ static int au_read_header(AVFormatContext *s,
     st = av_new_stream(s, 0);
     if (!st)
         return -1;
-    st->codec->codec_type = CODEC_TYPE_AUDIO;
+    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
     st->codec->codec_tag = id;
     st->codec->codec_id = codec;
     st->codec->channels = channels;