Beispiel #1
0
        /// <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 (MixerControl.IsControlBoolean(mc.dwControlType))
            {
                return(new BooleanMixerControl(mc, mixerHandle, mixerFlags, nChannels));
            }
            else if (MixerControl.IsControlSigned(mc.dwControlType))
            {
                return(new SignedMixerControl(mc, mixerHandle, mixerFlags, nChannels));
            }
            else if (MixerControl.IsControlUnsigned(mc.dwControlType))
            {
                return(new UnsignedMixerControl(mc, mixerHandle, mixerFlags, nChannels));
            }
            else if (MixerControl.IsControlListText(mc.dwControlType))
            {
                return(new ListTextMixerControl(mc, mixerHandle, mixerFlags, nChannels));
            }
            else if (MixerControl.IsControlCustom(mc.dwControlType))
            {
                return(new CustomMixerControl(mc, mixerHandle, mixerFlags, nChannels));
            }
            else
            {
                throw new InvalidOperationException(String.Format("Unknown mixer control type {0}", mc.dwControlType));
            }
        }
Beispiel #2
0
        /// <summary>
        /// Gets all the mixer controls
        /// </summary>
        /// <param name="mixerHandle">Mixer Handle</param>
        /// <param name="mixerLine">Mixer Line</param>
        /// <param name="mixerHandleType">Mixer Handle Type</param>
        /// <returns></returns>
        public static IList <MixerControl> GetMixerControls(IntPtr mixerHandle, MixerLine mixerLine,
                                                            MixerFlags mixerHandleType)
        {
            var controls = new List <MixerControl>();

            if (mixerLine.ControlsCount > 0)
            {
                int    mixerControlSize = Marshal.SizeOf(typeof(MixerInterop.MIXERCONTROL));
                var    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));
                try
                {
                    MmResult err = MixerInterop.mixerGetLineControls(mixerHandle, ref mlc, MixerFlags.All | mixerHandleType);
                    if (err != MmResult.NoError)
                    {
                        throw new MmException(err, "mixerGetLineControls");
                    }
                    for (int i = 0; i < mlc.cControls; i++)
                    {
                        Int64 address = pmc.ToInt64() + mixerControlSize * i;

                        var mc = (MixerInterop.MIXERCONTROL)
                                 Marshal.PtrToStructure((IntPtr)address, typeof(MixerInterop.MIXERCONTROL));
                        var mixerControl = GetMixerControl(mixerHandle, mixerLine.LineId, mc.dwControlID, mixerLine.Channels,
                                                           mixerHandleType);

                        controls.Add(mixerControl);
                    }
                }
                finally
                {
                    Marshal.FreeHGlobal(pmc);
                }
            }
            return(controls);
        }