/// <summary> /// Gets all the mixer controls /// </summary> /// <param name="mixerHandle"></param> /// <param name="mixerLine"></param> /// <param name="mixerHandleType"></param> /// <returns></returns> public static IList <MixerControl> GetMixerControls(IntPtr mixerHandle, MixerLine mixerLine, MixerFlags mixerHandleType) { List <MixerControl> controls = new List <MixerControl>(); if (mixerLine.ControlsCount > 0) { int mixerControlSize = Marshal.SizeOf(typeof(MixerInterop.MIXERCONTROL)); MixerInterop.MIXERLINECONTROLS mlc = new MixerInterop.MIXERLINECONTROLS(); IntPtr pmc = Marshal.AllocHGlobal(mixerControlSize * mixerLine.ControlsCount); mlc.cbStruct = Marshal.SizeOf(mlc); mlc.dwLineID = mixerLine.LineId; mlc.cControls = mixerLine.ControlsCount; mlc.pamxctrl = pmc; mlc.cbmxctrl = Marshal.SizeOf(typeof(MixerInterop.MIXERCONTROL)); MmResult err = MixerInterop.mixerGetLineControls(mixerHandle, ref mlc, MixerFlags.All | mixerHandleType); if (err != MmResult.NoError) { Marshal.FreeHGlobal(pmc); throw new MmException(err, "mixerGetLineControls"); } for (int i = 0; i < mlc.cControls; i++) { Int64 address = pmc.ToInt64() + mixerControlSize * i; MixerInterop.MIXERCONTROL mc = (MixerInterop.MIXERCONTROL)Marshal.PtrToStructure((IntPtr)address, typeof(MixerInterop.MIXERCONTROL)); MixerControl mixerControl = GetMixerControl(mixerHandle, mixerLine.LineId, mc.dwControlID, mixerLine.Channels, mixerHandleType); controls.Add(mixerControl); } } return(controls); }
/// <summary> /// Gets a specified Mixer Control /// </summary> /// <param name="mixerHandle">Mixer Handle</param> /// <param name="nLineID">Line ID</param> /// <param name="controlId">Control ID</param> /// <param name="nChannels">Number of Channels</param> /// <param name="mixerFlags">Flags to use (indicates the meaning of mixerHandle)</param> /// <returns></returns> public static MixerControl GetMixerControl(IntPtr mixerHandle, int nLineID, int controlId, int nChannels, MixerFlags mixerFlags) { MixerInterop.MIXERLINECONTROLS mlc = new MixerInterop.MIXERLINECONTROLS(); MixerInterop.MIXERCONTROL mc = new MixerInterop.MIXERCONTROL(); // set up the pointer to a structure IntPtr pMixerControl = Marshal.AllocCoTaskMem(Marshal.SizeOf(mc)); //Marshal.StructureToPtr(mc, pMixerControl, false); mlc.cbStruct = Marshal.SizeOf(mlc); mlc.cControls = 1; mlc.dwControlID = controlId; mlc.cbmxctrl = Marshal.SizeOf(mc); mlc.pamxctrl = pMixerControl; mlc.dwLineID = nLineID; MmResult err = MixerInterop.mixerGetLineControls(mixerHandle, ref mlc, MixerFlags.OneById | mixerFlags); if (err != MmResult.NoError) { Marshal.FreeCoTaskMem(pMixerControl); throw new MmException(err, "mixerGetLineControls"); } // retrieve the structure from the pointer mc = (MixerInterop.MIXERCONTROL)Marshal.PtrToStructure(mlc.pamxctrl, typeof(MixerInterop.MIXERCONTROL)); Marshal.FreeCoTaskMem(pMixerControl); if (IsControlBoolean(mc.dwControlType)) { return(new BooleanMixerControl(mc, mixerHandle, mixerFlags, nChannels)); } if (IsControlSigned(mc.dwControlType)) { return(new SignedMixerControl(mc, mixerHandle, mixerFlags, nChannels)); } if (IsControlUnsigned(mc.dwControlType)) { return(new UnsignedMixerControl(mc, mixerHandle, mixerFlags, nChannels)); } if (IsControlListText(mc.dwControlType)) { return(new ListTextMixerControl(mc, mixerHandle, mixerFlags, nChannels)); } if (IsControlCustom(mc.dwControlType)) { return(new CustomMixerControl(mc, mixerHandle, mixerFlags, nChannels)); } throw new ApplicationException(String.Format("Unknown mixer control type {0}", mc.dwControlType)); }