store extradata, vorbis in avi works now, dont expect av sync though

Originally committed as revision 2962 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/wav.c

@@ -105,8 +105,11 @@ int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
         put_le16(pb, 2); /* wav_extra_size */
         hdrsize += 2;
         put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
-    } else
-        put_le16(pb, 0); /* wav_extra_size */
+    } else {
+        put_le16(pb, enc->extradata_size);
+        put_buffer(pb, enc->extradata, enc->extradata_size);
+        hdrsize += enc->extradata_size;
+    }
 
     return hdrsize;
 }