static void PlatGetCDDAVolumeControl(void)
{
MMRESULT mmres;
unsigned int numAuxDevs,i;
numAuxDevs = auxGetNumDevs();
/* search the auxilary device list for the cd player */
for(i=0;i<numAuxDevs;i++)
{
AUXCAPS devCaps;
mmres = auxGetDevCaps(i,&devCaps,sizeof(AUXCAPS));
if(mmres==MMSYSERR_NOERROR)
{
if((devCaps.wTechnology&AUXCAPS_CDAUDIO)&&(devCaps.dwSupport&AUXCAPS_VOLUME))
{
cdAuxDeviceID = i;
}
}
}
}
void CD_FindCDAux(void)
{
UINT NumDevs,counter;
MMRESULT Result;
AUXCAPS Caps;
CD_ID = -1;
if (!COM_CheckParm("-usecdvolume"))
return;
NumDevs = auxGetNumDevs();
for(counter=0;counter<NumDevs;counter++)
{
Result = auxGetDevCaps(counter,&Caps,sizeof(Caps));
if (!Result) // valid
{
if (Caps.wTechnology == AUXCAPS_CDAUDIO)
{
CD_ID = counter;
auxGetVolume(CD_ID,&CD_OrigVolume);
return;
}
}
}
}
void Win32RedBookDevice::openVolume()
{
setLastError("");
// first attempt to get the volume control through the mixer API
S32 i;
for(i = mixerGetNumDevs() - 1; i >= 0; i--)
{
// open the mixer
if(mixerOpen((HMIXER*)&mVolumeDeviceId, i, 0, 0, 0) == MMSYSERR_NOERROR)
{
MIXERLINE lineInfo;
memset(&lineInfo, 0, sizeof(lineInfo));
lineInfo.cbStruct = sizeof(lineInfo);
lineInfo.dwComponentType = MIXERLINE_COMPONENTTYPE_SRC_COMPACTDISC;
// get the cdaudio line
if(mixerGetLineInfo(mVolumeDeviceId, &lineInfo, MIXER_GETLINEINFOF_COMPONENTTYPE) == MMSYSERR_NOERROR)
{
MIXERLINECONTROLS lineControls;
MIXERCONTROL volumeControl;
memset(&lineControls, 0, sizeof(lineControls));
lineControls.cbStruct = sizeof(lineControls);
lineControls.dwLineID = lineInfo.dwLineID;
lineControls.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
lineControls.cControls = 1;
lineControls.cbmxctrl = sizeof(volumeControl);
lineControls.pamxctrl = &volumeControl;
memset(&volumeControl, 0, sizeof(volumeControl));
volumeControl.cbStruct = sizeof(volumeControl);
// get the volume control
if(mixerGetLineControls(mVolumeDeviceId, &lineControls, MIXER_GETLINECONTROLSF_ONEBYTYPE) == MMSYSERR_NOERROR)
{
memset(&mMixerVolumeDetails, 0, sizeof(mMixerVolumeDetails));
mMixerVolumeDetails.cbStruct = sizeof(mMixerVolumeDetails);
mMixerVolumeDetails.dwControlID = volumeControl.dwControlID;
mMixerVolumeDetails.cChannels = 1;
mMixerVolumeDetails.cbDetails = sizeof(mMixerVolumeValue);
mMixerVolumeDetails.paDetails = &mMixerVolumeValue;
memset(&mMixerVolumeValue, 0, sizeof(mMixerVolumeValue));
// query the current value
if(mixerGetControlDetails(mVolumeDeviceId, &mMixerVolumeDetails, MIXER_GETCONTROLDETAILSF_VALUE) == MMSYSERR_NOERROR)
{
mUsingMixer = true;
mVolumeInitialized = true;
mOriginalVolume = mMixerVolumeValue.dwValue;
return;
}
}
}
}
mixerClose((HMIXER)mVolumeDeviceId);
}
// try aux
for(i = auxGetNumDevs() - 1; i >= 0; i--)
{
AUXCAPS caps;
auxGetDevCaps(i, &caps, sizeof(AUXCAPS));
if((caps.wTechnology == AUXCAPS_CDAUDIO) && (caps.dwSupport & AUXCAPS_VOLUME))
{
mAuxVolumeDeviceId = i;
mVolumeInitialized = true;
mUsingMixer = false;
auxGetVolume(i, (unsigned long *)&mOriginalVolume);
return;
}
}
setLastError("Volume failed to initialize");
}