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mp3dec: skip ID3v2 tags

--- a/sys/src/cmd/audio/mp3dec/main.c

+++ b/sys/src/cmd/audio/mp3dec/main.c

@@ -129,9 +129,20 @@

 error(void *, struct mad_stream *stream, struct mad_frame *frame)

 {

 	if(stream->error == MAD_ERROR_LOSTSYNC){

-		if(memcmp(stream->this_frame, "TAG", 3)==0){

+		uchar *p;

+		ulong n;

+

+		p = stream->this_frame;

+		if(memcmp(p, "TAG", 3)==0){

 			mad_stream_skip(stream, 128);

 			return MAD_FLOW_CONTINUE;

+		}

+		if(memcmp(p, "ID3", 3)==0){

+			if(((p[6] | p[7] | p[8] | p[9]) & 0x80) == 0){

+				n = p[9] | p[8]<<7 | p[7]<<14 | p[6]<<21;

+				mad_stream_skip(stream, n+10);

+				return MAD_FLOW_CONTINUE;

+			}

 		}

 	}

 	if(debug)