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 bool InnerSetMixer(int i, WinXpDllInterface.MIXER mixer, int volume)
{
WinXpDllInterface.MIXERDETAILS xdl = new WinXpDllInterface.MIXERDETAILS();
WinXpDllInterface.UMIXERDETAILS uxdl = new WinXpDllInterface.UMIXERDETAILS();
xdl.item = 0;
xdl.dwControlID = mixer.dwControlID;
xdl.cbStruct = Marshal.SizeOf(xdl);
xdl.cbDetails = Marshal.SizeOf(uxdl);
xdl.cChannels = 1;
uxdl.dwValue = volume;
xdl.paDetails = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(WinXpDllInterface.UMIXERDETAILS)));
Marshal.StructureToPtr(uxdl, xdl.paDetails, false);
int details = WinXpDllInterface.mixerSetControlDetails(i, ref xdl, WinXpDllInterface.MIXER_SETCONTROLDETAILSF_VALUE);
return(WinXpDllInterface.MMSYSERR_NOERROR == details);
}
private static bool GetIsMuted()
{
bool result = false;
InvokeTryCatch("WinXpVolumeOperate.GetIsMuted", () =>
{
WinXpDllInterface.MIXERINFO mixer = InnerGetMixerInfo();
WinXpDllInterface.MIXERDETAILS mcd = new WinXpDllInterface.MIXERDETAILS();
mcd.cbStruct = Marshal.SizeOf(typeof(WinXpDllInterface.MIXERDETAILS));
mcd.dwControlID = (int)mixer.muteCtl;
mcd.cChannels = 1;
mcd.cbDetails = 4;
mcd.paDetails = Marshal.AllocHGlobal((int)mcd.cbDetails);
WinXpDllInterface.mixerGetControlDetails(0, ref mcd, WinXpDllInterface.MIXER_GETCONTROLDETAILSF_VALUE | WinXpDllInterface.MIXER_OBJECTF_MIXER);
int rtn = Marshal.ReadInt32(mcd.paDetails);
Marshal.FreeHGlobal(mcd.paDetails);
result = rtn != 0;
});
return(result);
}
