opl: Change library to use us instead of ms.

Multi-track MIDI files are played back using separate callback chains
for each track, and this introduces the possibility of one track
becoming out of sync with the others. This was noticeable in WADs
that use multi-track MIDIs, such as Alien Vendetta. Increase the
timing resolution to microsecond precision to fix this.

1 files changed, 1 insertions, 1 deletions

diff --git a/opl/opl_internal.h b/opl/opl_internal.h
index 24e79644..2d027ad8 100644
--- a/opl/opl_internal.h
+++ b/opl/opl_internal.h
@@ -25,7 +25,7 @@ typedef int (*opl_init_func)(unsigned int port_base);
 typedef void (*opl_shutdown_func)(void);
 typedef unsigned int (*opl_read_port_func)(opl_port_t port);
 typedef void (*opl_write_port_func)(opl_port_t port, unsigned int value);
-typedef void (*opl_set_callback_func)(unsigned int ms,
+typedef void (*opl_set_callback_func)(unsigned int us,
                                       opl_callback_t callback,
                                       void *data);
 typedef void (*opl_clear_callbacks_func)(void);