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games/mp3dec: dont give up too soon on stream errors

--- a/sys/src/games/mp3dec/main.c

+++ b/sys/src/games/mp3dec/main.c

@@ -9,6 +9,7 @@

 char *name;

 vlong offset;

 int rate = 44100;

+int debug = 0;

 char *outfile;

 int vfd; /* /dev/volume */

@@ -149,12 +150,17 @@

 static enum mad_flow

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

 {

-	if(stream->error == MAD_ERROR_LOSTSYNC)

-		return MAD_FLOW_CONTINUE;

-	sysfatal("%s:#%lld: %s",

-		name, offset-(stream->bufend-stream->next_frame),

-		mad_stream_errorstr(stream));

-	return 0;

+	if(stream->error == MAD_ERROR_LOSTSYNC){

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

+			mad_stream_skip(stream, 128);

+			return MAD_FLOW_CONTINUE;

+		}

+	}

+	if(debug)

+		fprint(2, "%s:#%lld: %s\n",

+			name, offset-(stream->bufend-stream->next_frame),

+			mad_stream_errorstr(stream));

+	return MAD_FLOW_CONTINUE;

 }

 void

@@ -171,7 +177,7 @@

 void

 usage(void)

 {

-	fprint(2, "usage: mp3dec [-o outfile] [file...]\n");

+	fprint(2, "usage: mp3dec [ -d ] [ -o outfile ] [ file ... ]\n");

 	exits("usage");

 }

@@ -184,6 +190,9 @@

 	ARGBEGIN{

 	case 'o':

 		outfile = EARGF(usage());

+		break;

+	case 'd':

+		debug++;

 		break;

 	default:

 		usage();