midi: properly skip sysex messages

this fixes playing any midi files containing such messages
example: prince of persia midis from vgmpf wiki

diff --git a/sys/src/games/midi.c b/sys/src/games/midi.c
index 0b74bdc719cd63fc3f0491b72716b926a4eac13b..c6535219d6581ac6036771dd99486bc165e991d5 100644 (file)
--- a/sys/src/games/midi.c
+++ b/sys/src/games/midi.c
@@ -181,6 +181,11 @@ readevent(Tracker *src)
                get16(src);
                break;
        case 0xF:
+               if((t & 0xF) == 0){
+                       while(get8(src) != 0xF7)
+                               ;
+                       return;
+               }
                t = get8(src);
                n = get8(src);
                switch(t){