private static WinXpDllInterface.MIXER InnerGetMixer(int i, uint type, uint ctrlType, out int currVolume)
{
currVolume = -1;
WinXpDllInterface.LINECONTROLS mlc = new WinXpDllInterface.LINECONTROLS();
WinXpDllInterface.MIXERLINE mxl = new WinXpDllInterface.MIXERLINE();
WinXpDllInterface.MIXERDETAILS xdl = new WinXpDllInterface.MIXERDETAILS();
WinXpDllInterface.UMIXERDETAILS uxdl = new WinXpDllInterface.UMIXERDETAILS();
WinXpDllInterface.MIXER mixerControl = new WinXpDllInterface.MIXER();
mxl.cbStruct = (uint)Marshal.SizeOf(mxl);
mxl.dwComponentType = (uint)type;
int details = WinXpDllInterface.mixerGetLineInfoA(i, ref mxl, WinXpDllInterface.MIXER_GETLINEINFOF_COMPONENTTYPE);
if (WinXpDllInterface.MMSYSERR_NOERROR == details)
{
int mcSize = 152;
int control = Marshal.SizeOf(typeof(WinXpDllInterface.MIXER));
mlc.pamxctrl = Marshal.AllocCoTaskMem(mcSize);
mlc.cbStruct = (uint)Marshal.SizeOf(mlc);
mlc.dwLineID = mxl.dwLineID;
mlc.dwControl = (uint)ctrlType;
mlc.cControls = 1;
mlc.cbmxctrl = (uint)mcSize;
mixerControl.cbStruct = mcSize;
details = WinXpDllInterface.mixerGetLineControlsA(i, ref mlc, WinXpDllInterface.MIXER_GETLINECONTROLSF_ONEBYTYPE);
bool result = WinXpDllInterface.MMSYSERR_NOERROR == details;
if (result)
{
mixerControl = (WinXpDllInterface.MIXER)Marshal.PtrToStructure(mlc.pamxctrl, typeof(WinXpDllInterface.MIXER));
int mcDetailsSize = Marshal.SizeOf(typeof(WinXpDllInterface.MIXERDETAILS));
int mcDetailsUnsigned = Marshal.SizeOf(typeof(WinXpDllInterface.UMIXERDETAILS));
xdl.cbStruct = mcDetailsSize;
xdl.dwControlID = mixerControl.dwControlID;
xdl.paDetails = Marshal.AllocCoTaskMem(mcDetailsUnsigned);
xdl.cChannels = 1;
xdl.item = 0;
xdl.cbDetails = mcDetailsUnsigned;
details = WinXpDllInterface.mixerGetControlDetailsA(i, ref xdl, WinXpDllInterface.MIXER_GETCONTROLDETAILSF_VALUE);
uxdl = (WinXpDllInterface.UMIXERDETAILS)Marshal.PtrToStructure(xdl.paDetails, typeof(WinXpDllInterface.UMIXERDETAILS));
currVolume = uxdl.dwValue;
return(mixerControl);
}
}
return(mixerControl);
}
private static WinXpDllInterface.MIXERINFO InnerGetMixerInfo()
{
WinXpDllInterface.MIXERLINE mxl = new WinXpDllInterface.MIXERLINE();
WinXpDllInterface.LINECONTROLS mlc = new WinXpDllInterface.LINECONTROLS();
mxl.cbStruct = (uint)Marshal.SizeOf(typeof(WinXpDllInterface.MIXERLINE));
mlc.cbStruct = (uint)Marshal.SizeOf(typeof(WinXpDllInterface.LINECONTROLS));
WinXpDllInterface.mixerGetLineInfo(0, ref mxl, WinXpDllInterface.MIXER_OBJECTF_MIXER | WinXpDllInterface.MIXER_GETLINEINFOF_DESTINATION);
mlc.dwLineID = mxl.dwLineID;
mlc.cControls = mxl.cControls;
mlc.cbmxctrl = (uint)Marshal.SizeOf(typeof(WinXpDllInterface.MIXERCONTROL));
mlc.pamxctrl = Marshal.AllocHGlobal((int)(mlc.cbmxctrl * mlc.cControls));
WinXpDllInterface.mixerGetLineControls(0, ref mlc, WinXpDllInterface.MIXER_OBJECTF_MIXER | WinXpDllInterface.MIXER_GETLINECONTROLSF_ALL);
WinXpDllInterface.MIXERINFO rtn = new WinXpDllInterface.MIXERINFO();
for (int i = 0; i < mlc.cControls; i++)
{
WinXpDllInterface.MIXERCONTROL mxc = (WinXpDllInterface.MIXERCONTROL)Marshal.PtrToStructure((IntPtr)((int)mlc.pamxctrl + (int)mlc.cbmxctrl * i), typeof(WinXpDllInterface.MIXERCONTROL));
switch (mxc.dwControlType)
{
case WinXpDllInterface.MIXERCONTROL_CONTROLTYPE_VOLUME:
rtn.volumeCtl = mxc.dwControlID;
rtn.minVolume = mxc.Bounds.lMinimum;
rtn.maxVolume = mxc.Bounds.lMaximum;
break;
case WinXpDllInterface.MIXERCONTROL_CONTROLTYPE_MUTE:
rtn.muteCtl = mxc.dwControlID;
break;
}
}
Marshal.FreeHGlobal(mlc.pamxctrl);
return(rtn);
}
