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Win32 MIDI output: Identify Microsoft software synth, and if detected, make use of MIDI functions to emulate Roland GS master volume SysEx on Windows.

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Jonathan Campbell 2025-01-14 05:24:13 -08:00
parent 76269b8f36
commit 626aa8c507
1 changed files with 49 additions and 0 deletions
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49
src/gui/midi_win32.h
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@ -32,6 +32,9 @@ private:
HMIDIOUT m_out = NULL;
MIDIHDR m_hdr = {};
HANDLE m_event = NULL;
bool useMidiVolume = false;
bool isMicrosoftSoftSynth = false;
bool resetVolume = true;
bool isOpen;
#if WIN32_MIDI_PORT_PROTECT
@ -121,6 +124,16 @@ public:
midiOutGetDevCaps(nummer, &mididev, sizeof(MIDIOUTCAPS));
LOG_MSG("MIDI:win32 selected %s",mididev.szPname);
/* If we're not talking to MIDI hardware, but the default Microsoft software synthesizer,
and it supports volume control, we want to use it, because Microsoft's MIDI synth also
does not recognize the Roland GS master volume SysEx either. */
if(mididev.dwSupport & MIDICAPS_VOLUME) {
if(mididev.wTechnology == MOD_SWSYNTH) {
isMicrosoftSoftSynth = true;
}
}
resetVolume = true;
#if WIN32_MIDI_PORT_PROTECT
if( midi_dll == false || strcmp( mididev.szPname, "Roland VSC" ) != 0 )
@ -172,6 +185,20 @@ public:
void PlayMsg(uint8_t * msg) {
midiOutShortMsg(m_out, *(uint32_t*)msg);
/* This must be done AFTER to prevent the notes left hanging from ever becoming audible before reset */
if(*msg == 0xFF/*MIDI RESET*/) {
midiOutReset(m_out);
resetVolume = true;
}
else {
if(resetVolume) {
if(isMicrosoftSoftSynth) {
midiOutSetVolume(m_out, 0xFFFF);
}
resetVolume = false;
}
}
};
void PlaySysex(uint8_t * sysex,Bitu len) {
@ -186,6 +213,28 @@ public:
}
#endif
if(roland_gs_sysex) {
if(sysex[1] == 0x41/*Roland*/ && sysex[3] == 0x42/*GS*/ && sysex[4] == 0x12/*Send*/ && len >= 9) {
const uint32_t addr =
((uint32_t)sysex[5] << 16) +
((uint32_t)sysex[6] << 8) +
(uint32_t)sysex[7];
if(addr == 0x400004) { /* MASTER VOLUME */
if(isMicrosoftSoftSynth) {
/* input: MIDI volume 0-127
output: MIDI volume 0x0000-0xFFFF */
unsigned int mvol = sysex[8];
if(mvol > 127) mvol = 127;
mvol = (mvol * 0xFFFFu) / 127u;
midiOutSetVolume(m_out, mvol);
resetVolume = false;
return;
}
}
}
}
midiOutUnprepareHeader (m_out, &m_hdr, sizeof (m_hdr));
m_hdr.lpData = (char *) sysex;