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- consider the volume control of all Windows MIDI mapper devices broken, because it may be the GS synth, which is not detectable.

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This commit is contained in:
Christoph Oelckers 2017-04-21 10:37:03 +02:00
parent c681d6eff0
commit 66b5c26352
1 changed files with 28 additions and 14 deletions
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42
src/sound/mididevices/music_win_mididevice.cpp
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@ -659,33 +659,47 @@ void CALLBACK WinMIDIDevice::CallbackFunc(HMIDIOUT hOut, UINT uMsg, DWORD_PTR dw
static bool IgnoreMIDIVolume(UINT id)
{
#ifndef __GNUC__
MIDIOUTCAPS caps;
bool mustcheck = false;
if (MMSYSERR_NOERROR == midiOutGetDevCaps(id, &caps, sizeof(caps)))
{
if (caps.wTechnology == MIDIDEV_MAPPER)
{
// We cannot determine what this is so we have to assume the worst, as the default
// devive's volume control is irreparably broken.
mustcheck = true;
}
// The Microsoft GS Wavetable Synth advertises itself as MIDIDEV_SWSYNTH with a VOLUME control.
// If the one we're using doesn't match that, we don't need to bother checking the name.
if (caps.wTechnology == MIDIDEV_SWSYNTH && (caps.dwSupport & MIDICAPS_VOLUME))
{
if (strncmp(caps.szPname, "Microsoft GS", 12) == 0)
{
IMMDeviceEnumerator *enumerator;
// Now try to create an IMMDeviceEnumerator interface. If it succeeds,
// we know we're using the new audio stack introduced with Vista and
// should ignore this MIDI device's volume control.
if (SUCCEEDED(CoCreateInstance(__uuidof(MMDeviceEnumerator), nullptr, CLSCTX_ALL,
__uuidof(IMMDeviceEnumerator), (void**)&enumerator))
&& enumerator != nullptr)
{
enumerator->Release();
return true;
}
mustcheck = true;
}
}
}
if (mustcheck)
{
#ifndef __GNUC__
IMMDeviceEnumerator *enumerator;
// Now try to create an IMMDeviceEnumerator interface. If it succeeds,
// we know we're using the new audio stack introduced with Vista and
// should ignore this MIDI device's volume control.
if (SUCCEEDED(CoCreateInstance(__uuidof(MMDeviceEnumerator), nullptr, CLSCTX_ALL,
__uuidof(IMMDeviceEnumerator), (void**)&enumerator))
&& enumerator != nullptr)
{
enumerator->Release();
return true;
}
#else
// assume the worst and consider volume control broken.
return true;
#endif
}
}
return false;
}