avformat/dsddec: create audio stream before processing id3

This ensures stream[0] is always the audio stream (an assumption made
in dsf_read_packet).
Signed-off-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/dsfdec.c

@@ -70,6 +70,11 @@ static int dsf_read_header(AVFormatContext *s)
     if (avio_rl64(pb) != 28)
         return AVERROR_INVALIDDATA;
 
+    /* create primary stream before any id3 coverart streams */
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
     avio_skip(pb, 8);
     id3pos = avio_rl64(pb);
     if (pb->seekable) {
@@ -92,10 +97,6 @@ static int dsf_read_header(AVFormatContext *s)
         return AVERROR_INVALIDDATA;
     }
 
-    st = avformat_new_stream(s, NULL);
-    if (!st)
-        return AVERROR(ENOMEM);
-
     channel_type = avio_rl32(pb);
     if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout))
         st->codec->channel_layout = dsf_channel_layout[channel_type];