https://bugs.winehq.org/show_bug.cgi?id=42818
Bug ID: 42818 Summary: MIDI Time Code Quarter Frame messages not passed to ALSA Product: Wine Version: 1.6 Hardware: x86 OS: Linux Status: UNCONFIRMED Severity: minor Priority: P2 Component: winealsa.drv Assignee: wine-bugs@winehq.org Reporter: mdmayfield@yahoo.com Distribution: ---
MIDI Time Code (MTC) Quarter Frame messages are not correctly passed to ALSA, causing sync to fail when the Windows application running under Wine (such as REAPER) is the master timekeeper.
The problem is in dlls/winealsa.drv/midi.c, lines 931-945, which tries to use snd_seq_ev_set_sysex to send these messages. Based on the discussion in https://bugs.winehq.org/show_bug.cgi?id=26928 this must have once worked, but apparently with more recent versions of ALSA these messages are never actually sent via snd_seq_ev_set_sysex (it must have become more strict in its definition of "SysEx").
Commit 53454ce9359f4ec485aa9411a0e9b14e3d1ed0fa "Fix handling of system real time MIDI messages" by 00cpxxx appears to address a very similar issue with some messages, but does not address Quarter Frames.
By using that approach as a template I was able to make Quarter Frame messages work again: https://github.com/mdmayfield/wine/commit/ab1763e7287a7062f658c40def5bf9919f...
Without this patch I could reproduce the issue on Wine 1.6, 1.8, 1.9,and 2.4.
Once I have time I will try to create a proper patch submission. Otherwise please feel free to use or adapt the fix from the GitHub link above.
Thanks,
Matt