[Bug 51979] New: Sending of Midi SysEx Events not working

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51979

            Bug ID: 51979
           Summary: Sending of Midi SysEx Events not working
           Product: Wine
           Version: 6.20
          Hardware: x86-64
                OS: Mac OS X
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: reinhold.hoffmann at hotmail.com

The sending of midi SysEx events to an external device like a keyboard fails.
SysEx events are very common like all the midi reset events.

Component: dlls\winecoreaudio.drv
File: midi.c

This is related to coreaudio, alsa is OK.´

The issue is that SysEx events are encapsulated by 0xF0, 0xF7. These
encapsulated bytes are stripped before the routine MIDIOut_LongData is called. 

In MIDIOut_LongData the following happens:

Warning 
"The allegedly system exclusive buffer is not correct. Please report with MIDI
file"
Errors
"Add missing 0xF0 marker at the beginning of system exclusive byte stream"
"Add missing 0xF7 marker at the end of system exclusive byte stream"

But the event is being sent to the external port as if the encapsulated bytes
would exist.
I use a Yamaha keyboard. This macOS driver has been recently upgraded for macOS
Big Sur, Monterey. This driver now fails.

================================

Comparing the same situation for the alsa driver

Component: dlls\winealsa.drv
File: midi.c

The equivalent to MIDIOut_LongData of coreaudio here is modLongData.
In modLongData the encapsulated bytes are added in case they are missing.

I recommend to add the same tolerant step to MIDIOut_LongData as well.

Unfortunately, tracing of a midi file was not possible because both routines
crash when trace is active for dwBufferLength=2 which is a regular case even
for long midi data.

Further, there is a comment in both files "but it seems to be used only for
midi input". This is not the case. LongData are used for midi out, too.

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