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- Do not call midiOutSetVolume() when playing with the "Microsoft GS Wavetable Synth" on

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Vista and above, because it doesn't do what you expect.

SVN r2136 (trunk)
This commit is contained in:
Randy Heit 2010-01-26 05:11:04 +00:00
parent 02909bd71c
commit 5125e11d25
1 changed files with 74 additions and 4 deletions
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78
src/sound/music_win_mididevice.cpp
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@ -41,6 +41,10 @@
#include "doomdef.h"
#include "m_swap.h"
#ifndef __GNUC__
#include <mmdeviceapi.h>
#endif
// MACROS ------------------------------------------------------------------
// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
@ -49,6 +53,8 @@
// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
static bool IgnoreMIDIVolume(UINT id);
// EXTERNAL DATA DECLARATIONS ----------------------------------------------
// PRIVATE DATA DEFINITIONS ------------------------------------------------
@ -100,11 +106,18 @@ int WinMIDIDevice::Open(void (*callback)(UINT, void *, DWORD, DWORD), void *user
if (err == MMSYSERR_NOERROR)
{
// Set master volume to full, if the device allows it on this interface.
VolumeWorks = (MMSYSERR_NOERROR == midiOutGetVolume((HMIDIOUT)MidiOut, &SavedVolume));
if (VolumeWorks)
if (IgnoreMIDIVolume(DeviceID))
{
VolumeWorks &= (MMSYSERR_NOERROR == midiOutSetVolume((HMIDIOUT)MidiOut, 0xffffffff));
VolumeWorks = false;
}
else
{
// Set master volume to full, if the device allows it on this interface.
VolumeWorks = (MMSYSERR_NOERROR == midiOutGetVolume((HMIDIOUT)MidiOut, &SavedVolume));
if (VolumeWorks)
{
VolumeWorks &= (MMSYSERR_NOERROR == midiOutSetVolume((HMIDIOUT)MidiOut, 0xffffffff));
}
}
}
}
@ -391,4 +404,61 @@ void CALLBACK WinMIDIDevice::CallbackFunc(HMIDIOUT hOut, UINT uMsg, DWORD_PTR dw
}
}
//==========================================================================
//
// IgnoreMIDIVolume
//
// Should we ignore this MIDI device's volume control even if it works?
//
// Under Windows Vista and up, when using the standard "Microsoft GS
// Wavetable Synth", midiOutSetVolume() will affect the application's audio
// session volume rather than the volume for just the MIDI stream. At first,
// I thought I could get around this by enumerating the streams in the
// audio session to find the MIDI device's stream to set its volume
// manually, but there doesn't appear to be any way to enumerate the
// individual streams in a session. Consequently, we'll just assume the MIDI
// device gets created at full volume like we want. (Actual volume changes
// are done by sending MIDI channel volume messages to the stream, not
// through midiOutSetVolume().)
//
// This is using VC++'s __uuidof extension instead of the the CLSID_ and
// IID_ definitions because I couldn't figure out why it wasn't finding them
// when linking, and __uuidof circumvents that problem. I'd also be
// surprised if w32api includes any WASAPI stuff any time soon, so it's no
// big loss making this VC++-specific for the time being
//
//==========================================================================
static bool IgnoreMIDIVolume(UINT id)
{
#ifndef __GNUC__
MIDIOUTCAPS caps;
if (MMSYSERR_NOERROR == midiOutGetDevCaps(id, &caps, sizeof(caps)))
{
// The Microsoft GS Wavetable Synth advertises itself as MOD_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 == MOD_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), NULL, CLSCTX_ALL,
__uuidof(IMMDeviceEnumerator), (void**)&enumerator))
&& enumerator != NULL)
{
enumerator->Release();
return true;
}
}
}
}
#endif
return false;
}
#endif