/// <summary>
/// Gets the master volume level of the audio stream
/// that enters or leaves the audio endpoint device. The volume level is expressed as a
/// normalized, audio-tapered value in the range from 0.0 to 1.0.
/// </summary>
/// <param name="level">
/// A float
/// variable into which the method writes the volume level. The level is expressed as a
/// normalized value in the range from 0.0 to 1.0.
/// </param>
/// <returns>HRESULT</returns>
public unsafe int GetMasterVolumeLevelScalarNative(out float level)
{
fixed(void *ptr = &level)
{
return(LocalInterop.Calli(UnsafeBasePtr, ptr, ((void **)(*(void **)UnsafeBasePtr))[9]));
}
}
/// <summary>
/// The GetPosition method gets the current device position.
/// </summary>
/// <param name="pu64Position">
/// The device position is the offset from the start of the stream to the current position in the stream. However, the
/// units in which this offset is expressed are undefined—the device position value has meaning only in relation to the
/// <see cref="Pu64Frequency" />. For more information, see
/// <see href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd370889(v=vs.85).aspx" />.
/// </param>
/// <param name="pu64QPCPosition">
/// The value of the performance counter at the time that the audio endpoint device read the device position
/// (<paramref name="pu64Position" />) in response to the <see cref="GetPositionNative" /> call. The method converts
/// the counter value to 100-nanosecond time
/// units before writing it to <paramref name="pu64QPCPosition" />.
/// </param>
/// <returns>HRESULT</returns>
// ReSharper disable once InconsistentNaming
public unsafe int GetPositionNative(out long pu64Position, out long pu64QPCPosition)
{
fixed(void *p0 = &pu64Position, p1 = &pu64QPCPosition)
{
return(LocalInterop.Calli(UnsafeBasePtr, p0, p1, ((void **)(*(void **)UnsafeBasePtr))[4]));
}
}
/// <summary>
/// The GetFrequency method gets the device frequency.
/// </summary>
/// <param name="pu64Frequency">
/// The device frequency. For more information, see
/// <see href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd370889(v=vs.85).aspx" />.
/// </param>
/// <returns>HRESULT</returns>
public unsafe int GetFrequencyNative(out long pu64Frequency)
{
fixed(void *p = &pu64Frequency)
{
return(LocalInterop.Calli(UnsafeBasePtr, p, ((void **)(*(void **)UnsafeBasePtr))[3]));
}
}
/// <summary>
/// Retrieves the length of the periodic interval separating
/// successive processing passes by the audio engine on the data in the endpoint buffer.
/// </summary>
/// <param name="hnsDefaultDevicePeriod">
/// Retrieves a time value specifying the default interval between periodic processing
/// passes by the audio engine. The time is expressed in 100-nanosecond units.
/// </param>
/// <param name="hnsMinimumDevicePeriod">
/// Retrieves a time value specifying the minimum interval between periodic processing
/// passes by the audio endpoint device. The time is expressed in 100-nanosecond units.
/// </param>
/// <remarks>
/// Use the <paramref name="hnsDefaultDevicePeriod" /> and the <paramref name="hnsMinimumDevicePeriod" /> properties instead of
/// the <see cref="GetDevicePeriodNative" /> method.
/// For more information, see
/// <see href="https://msdn.microsoft.com/en-us/library/windows/desktop/dd370871(v=vs.85).aspx" />.
/// </remarks>
/// <returns>HRESULT</returns>
public unsafe int GetDevicePeriodNative(out long hnsDefaultDevicePeriod, out long hnsMinimumDevicePeriod)
{
fixed(void *ddp = &hnsDefaultDevicePeriod, mdp = &hnsMinimumDevicePeriod)
{
return(LocalInterop.Calli(UnsafeBasePtr, ddp, mdp, ((void **)(*(void **)UnsafeBasePtr))[9]));
}
}
/// <summary>
/// Gets the process identifier of the audio session.
/// <seealso cref="ProcessID"/>
/// </summary>
/// <param name="processId">A variable which receives the process id of the audio session.</param>
/// <returns>HRESULT</returns>
public unsafe int GetProcessIdNative(out int processId)
{
fixed(void *p = &processId)
{
return(LocalInterop.Calli(UnsafeBasePtr, p, ((void **)(*(void **)UnsafeBasePtr))[14]));
}
}
/// <summary>
/// Retrieves the maximum latency for the current stream and can
/// be called any time after the stream has been initialized.
/// </summary>
/// <param name="hnsLatency">Retrieves a value representing the latency. The time is expressed in 100-nanosecond units.</param>
/// <remarks>
/// Rendering clients can use this latency value to compute the minimum amount of data that
/// they can write during any single processing pass. To write less than this minimum is to
/// risk introducing glitches into the audio stream. For more information, see
/// <see href="https://msdn.microsoft.com/en-us/library/windows/desktop/dd370874(v=vs.85).aspx" />.
/// </remarks>
/// <returns>HRESULT</returns>
public unsafe int GetStreamLatencyNative(out long hnsLatency)
{
fixed(void *pl = &hnsLatency)
{
return(LocalInterop.Calli(UnsafeBasePtr, pl, ((void **)(*(void **)UnsafeBasePtr))[5]));
}
}
/// <summary>
/// Indicates whether the audio endpoint device
/// supports a particular stream format.
/// </summary>
/// <param name="shareMode">
/// The sharing mode for the stream format. Through this parameter, the client indicates whether it
/// wants to use the specified format in exclusive mode or shared mode.
/// </param>
/// <param name="waveFormat">The stream format to test whether it is supported by the <see cref="AudioClient" /> or not.</param>
/// <param name="closestMatch">
/// Retrieves the supported format that is closest to the format that the client specified
/// through the <paramref name="waveFormat" /> parameter. If <paramref name="shareMode" /> is
/// <see cref="AudioClientShareMode.Shared" />, the <paramref name="closestMatch" /> will be always null.
/// </param>
/// <returns>
/// HRESULT code. If the method returns 0 (= <see cref="HResult.S_OK" />), the endpoint device supports the specified
/// <paramref name="waveFormat" />. If the method returns
/// 1 (= <see cref="HResult.S_FALSE" />), the method succeeded with a <paramref name="closestMatch" /> to the specified
/// <paramref name="waveFormat" />. If the method returns
/// 0x88890008 (= <see cref="HResult.AUDCLNT_E_UNSUPPORTED_FORMAT" />), the method succeeded but the specified format
/// is not supported in exclusive mode. If the method returns anything else, the method failed.
/// </returns>
/// <remarks>
/// For more information, see
/// <see href="https://msdn.microsoft.com/en-us/library/windows/desktop/dd370876(v=vs.85).aspx" />.
/// </remarks>
public unsafe int IsFormatSupportedNative(AudioClientShareMode shareMode, WaveFormat waveFormat,
out WaveFormat closestMatch)
{
closestMatch = null;
IntPtr pclosestMatch = IntPtr.Zero;
GCHandle hWaveFormat = GCHandle.Alloc(waveFormat, GCHandleType.Pinned);
int result;
try
{
result = LocalInterop.Calli(UnsafeBasePtr, shareMode, hWaveFormat.AddrOfPinnedObject().ToPointer(),
shareMode == AudioClientShareMode.Shared ? &pclosestMatch : IntPtr.Zero.ToPointer(),
((void **)(*(void **)UnsafeBasePtr))[7]);
if (pclosestMatch != IntPtr.Zero)
{
closestMatch = (WaveFormat)Marshal.PtrToStructure(pclosestMatch, typeof(WaveFormat));
if (closestMatch.ExtraSize == WaveFormatExtensible.WaveFormatExtensibleExtraSize)
{
closestMatch =
(WaveFormatExtensible)Marshal.PtrToStructure(pclosestMatch, typeof(WaveFormatExtensible));
}
}
}
finally
{
hWaveFormat.Free();
if (pclosestMatch != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(pclosestMatch);
}
}
return(result);
}
/// <summary>
/// The <see cref="GetDevicePositionNative" /> method gets the current device position, in frames, directly from the
/// hardware.
/// </summary>
/// <param name="devicePosition">
/// Receives the device position, in frames. The received position is an unprocessed value
/// that the method obtains directly from the hardware. For more information, see
/// <see href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd370883(v=vs.85).aspx" />.
/// </param>
/// <param name="qpcPosition">
/// Receives the value of the performance counter at the time that the audio endpoint device read
/// the device position retrieved in the <paramref name="devicePosition" /> parameter in response to the
/// <see cref="GetDevicePositionNative" /> call.
/// <see cref="GetDevicePositionNative" /> converts the counter value to 100-nanosecond time units before writing it to
/// QPCPosition.
/// </param>
/// <returns>HRESULT</returns>
public unsafe int GetDevicePositionNative(out long devicePosition, out long qpcPosition)
{
fixed(void *p0 = &devicePosition, p1 = &qpcPosition)
{
return(LocalInterop.Calli(UnsafeBasePtr, p0, p1, ((void **)(*(void **)UnsafeBasePtr))[3]));
}
}
/// <summary>
/// Retrieves the client volume level for the audio session.
/// <seealso cref="MasterVolume"/>
/// </summary>
/// <param name="volume">A variable into which the method writes the client volume level. The volume level is a value in the range 0.0 to 1.0.</param>
/// <returns>HRESULT</returns>
public unsafe int GetMasterVolumeNative(out float volume)
{
fixed(void *pvolume = &volume)
{
return(LocalInterop.Calli(UnsafeBasePtr, pvolume, ((void **)(*(void **)UnsafeBasePtr))[4]));
}
}
/// <summary>
/// Queries the audio endpoint device for its
/// hardware-supported functions.
/// </summary>
/// <param name="hardwareSupportMask">
/// A variable into which the method writes a hardware support mask that indicates the
/// hardware capabilities of the audio endpoint device.
/// </param>
/// <returns>HRESULT</returns>
public unsafe int QueryHardwareSupportNative(out EndpointHardwareSupportFlags hardwareSupportMask)
{
fixed(void *ptr = &hardwareSupportMask)
{
return(LocalInterop.Calli(UnsafeBasePtr, ptr, ((void **)(*(void **)UnsafeBasePtr))[19]));
}
}
/// <summary>
/// Gets the volume range, in decibels, of the audio stream that
/// enters or leaves the audio endpoint device.
/// </summary>
/// <param name="volumeMinDB">
/// Minimum volume level in decibels. This value remains constant
/// for the lifetime of the <see cref="AudioEndpointVolume" /> object instance.
/// </param>
/// <param name="volumeMaxDB">
/// Maximum volume level in decibels. This value remains constant
/// for the lifetime of the <see cref="AudioEndpointVolume" /> object instance.
/// </param>
/// <param name="volumeIncrementDB">
/// Volume increment in decibels. This increment remains
/// constant for the lifetime of the <see cref="AudioEndpointVolume" /> object instance.
/// </param>
/// <returns>HREUSLT</returns>
public unsafe int GetVolumeRangeNative(out float volumeMinDB, out float volumeMaxDB, out float volumeIncrementDB)
{
fixed(void *ptr1 = &volumeMinDB, ptr2 = &volumeMaxDB, ptr3 = &volumeIncrementDB)
{
return(LocalInterop.Calli(UnsafeBasePtr, ptr1, ptr2, ptr3, ((void **)(*(void **)UnsafeBasePtr))[20]));
}
}
/// <summary>
/// Gets information about the current step in the volume
/// range.
/// </summary>
/// <param name="currentStep">
/// A variable into which the method writes the current step index. This index is a value in the
/// range from 0 to <paramref name="stepCount" />– 1, where 0 represents the minimum volume level and
/// <paramref name="stepCount" />– 1 represents the maximum level.
/// </param>
/// <param name="stepCount">
/// A variable into which the method writes the number of steps in the volume range. This number
/// remains constant for the lifetime of the <see cref="AudioEndpointVolume" /> object instance.
/// </param>
/// <returns>HRESULT</returns>
public unsafe int GetVolumeStepInfoNative(out int currentStep, out int stepCount)
{
fixed(void *ptr1 = ¤tStep, ptr2 = &stepCount)
{
return(LocalInterop.Calli(UnsafeBasePtr, ptr1, ptr2, ((void **)(*(void **)UnsafeBasePtr))[16]));
}
}
/// <summary>
/// Gets the muting state of the audio stream that enters or leaves the
/// audio endpoint device.
/// </summary>
/// <param name="mute">
/// A Variable into which the method writes the muting state.
/// If <paramref name="mute" /> is <c>true</c>, the stream is muted. If <c>false</c>, the stream is not muted.
/// </param>
/// <returns>HRESULT</returns>
public unsafe int GetMuteNative(out NativeBool mute)
{
fixed(void *ptr = &mute)
{
return(LocalInterop.Calli(UnsafeBasePtr, ptr, ((void **)(*(void **)UnsafeBasePtr))[15]));
}
}
/// <summary>
/// Gets the normalized, audio-tapered volume level
/// of the specified channel of the audio stream that enters or leaves the audio endpoint
/// device.
/// </summary>
/// <param name="level">
/// A float variable into which the method writes the volume
/// level. The level is expressed as a normalized value in the range from 0.0 to
/// 1.0.
/// </param>
/// <param name="channel">
/// The channel number. If the audio stream contains n channels, the channels are numbered from 0 to
/// n–1.
/// </param>
/// <returns>HRESULT</returns>
public unsafe int GetChannelVolumeLevelScalarNative(int channel, out float level)
{
fixed(void *ptr = &level)
{
return(LocalInterop.Calli(UnsafeBasePtr, channel, ptr, ((void **)(*(void **)UnsafeBasePtr))[13]));
}
}
/// <summary>
/// Deletes the registration to receive ducking notifications.
/// <seealso cref="UnregisterDuckNotification"/>
/// </summary>
/// <param name="sessionNotification">
/// The <see cref="IAudioVolumeDuckNotification"/> interface that is implemented by the application. Pass the same interface pointer that was specified to the session manager in a previous call to the <see cref="RegisterDuckNotification"/> method.
/// </param>
/// <returns>HRESULT</returns>
public unsafe int UnregisterDuckNotificationNative(IAudioVolumeDuckNotification sessionNotification)
{
int result = 0;
if (_volumeDuckNotifications.Contains(sessionNotification))
{
IntPtr ptr = sessionNotification != null
? Marshal.GetComInterfaceForObject(sessionNotification, typeof(IAudioVolumeDuckNotification))
: IntPtr.Zero;
try
{
result = LocalInterop.Calli(UnsafeBasePtr, (void *)ptr, ((void **)(*(void **)UnsafeBasePtr))[9]);
}
finally
{
if (ptr != IntPtr.Zero)
{
Marshal.Release(ptr);
}
}
_volumeDuckNotifications.Remove(sessionNotification);
}
return(result);
}
/// <summary>
/// The GetMute method retrieves the current muting state for the audio session.
/// <seealso cref="IsMuted"/>
/// </summary>
/// <param name="isMuted">A variable into which the method writes the muting state. TRUE indicates that muting is enabled. FALSE indicates that it is disabled.</param>
/// <returns>HRESULT</returns>
public unsafe int GetMuteInternal(out NativeBool isMuted)
{
fixed(void *pismuted = &isMuted)
{
return(LocalInterop.Calli(UnsafeBasePtr, pismuted, ((void **)(*(void **)UnsafeBasePtr))[6]));
}
}
/// <summary>
/// Retrieves the size (maximum capacity) of the endpoint buffer.
/// </summary>
/// <param name="bufferFramesCount">Retrieves the number of audio frames that the buffer can hold.</param>
/// <remarks>
/// The size of one frame = <c>(number of bits per sample)/8 * (number of channels)</c>
/// </remarks>
/// <returns>HRESULT</returns>
public unsafe int GetBufferSizeNative(out Int32 bufferFramesCount)
{
fixed(void *pbfc = &bufferFramesCount)
{
return(LocalInterop.Calli(UnsafeBasePtr, pbfc, ((void **)(*(void **)UnsafeBasePtr))[4]));
}
}
/// <summary>
/// Gets the total number of audio sessions that are open on the audio device.
/// <seealso cref="Count"/>
/// </summary>
/// <param name="count">Receives the total number of audio sessions.</param>
/// <returns>HRESULT</returns>
public unsafe int GetCountNative(out int count)
{
fixed(void *p = &count)
{
return(LocalInterop.Calli(UnsafeBasePtr, p, ((void **)(*(void **)UnsafeBasePtr))[3]));
}
}
/// <summary>
/// Retrieves the number of frames of padding in the endpoint buffer.
/// </summary>
/// <param name="numPaddingFrames">Retrieves the frame count (the number of audio frames of padding in the buffer).</param>
/// <returns>HRESULT</returns>
/// <remarks>
/// The size of one frame = <c>(number of bits per sample)/8 * (number of channels)</c>
/// </remarks>
public unsafe int GetCurrentPaddingNative(out Int32 numPaddingFrames)
{
fixed(void *pndf = &numPaddingFrames)
{
return(LocalInterop.Calli(UnsafeBasePtr, pndf, ((void **)(*(void **)UnsafeBasePtr))[6]));
}
}
/// <summary>
/// Retrieves the current state of the audio session.
/// <seealso cref="SessionState"/>
/// </summary>
/// <param name="state">A variable into which the method writes the current session state.</param>
/// <returns>HRESULT</returns>
public unsafe int GetStateNative(out AudioSessionState state)
{
fixed(void *p = &state)
{
return(LocalInterop.Calli(UnsafeBasePtr, p, ((void **)(*(void **)UnsafeBasePtr))[3]));
}
}
/// <summary>
/// Retrieves the stream format that the audio engine uses for its
/// internal processing of shared-mode streams.
/// </summary>
/// <param name="deviceFormat">
/// Retrieves the mix format that the audio engine uses for its internal processing of
/// shared-mode streams.
/// </param>
/// <remarks>
/// For more information, see
/// <see href="https://msdn.microsoft.com/en-us/library/windows/desktop/dd370872(v=vs.85).aspx" />.
/// </remarks>
/// <returns>HRESULT</returns>
public unsafe int GetMixFormatNative(out WaveFormat deviceFormat)
{
IntPtr pdeviceFormat = IntPtr.Zero;
int result;
if ((result = LocalInterop.Calli(UnsafeBasePtr, &pdeviceFormat, ((void **)(*(void **)UnsafeBasePtr))[8])) ==
0 && pdeviceFormat != IntPtr.Zero)
{
try
{
//deviceFormat = Marshal.PtrToStructure(pdeviceFormat, typeof (WaveFormat)) as WaveFormat;
//if (deviceFormat != null && deviceFormat.WaveFormatTag == AudioEncoding.Extensible)
//{
// deviceFormat =
// Marshal.PtrToStructure(pdeviceFormat, typeof (WaveFormatExtensible)) as WaveFormatExtensible;
//}
deviceFormat = WaveFormatMarshaler.PointerToWaveFormat(pdeviceFormat);
}
finally
{
Marshal.FreeCoTaskMem(pdeviceFormat);
}
return(result);
}
deviceFormat = null;
return(result);
}
/// <summary>
/// Retrieves the grouping parameter of the audio session.
/// <seealso cref="GroupingParam"/>
/// </summary>
/// <param name="groupingParam">A variable into which the method writes the grouping parameter.</param>
/// <returns>HRESULT</returns>
/// <remarks>For some more information about grouping parameters, see <see href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd370848(v=vs.85).aspx"/>.</remarks>
public unsafe int GetGroupingParamNative(out Guid groupingParam)
{
fixed(void *p = &groupingParam)
{
return(LocalInterop.Calli(UnsafeBasePtr, p, ((void **)(*(void **)UnsafeBasePtr))[8]));
}
}
/// <summary>
/// Accesses additional services from the audio client object.
/// </summary>
/// <param name="riid">
/// The interface ID for the requested service. For a list of all available values, see
/// <see href="https://msdn.microsoft.com/en-us/library/windows/desktop/dd370873(v=vs.85).aspx" />.
/// </param>
/// <param name="ppv">
/// A pointer variable into which the method writes the address of an instance of the
/// requested interface. Through this method, the caller obtains a counted reference to the interface. The caller is
/// responsible for releasing the interface, when it is no longer needed, by calling the interface's Release method. If
/// the GetService call fails, *ppv is <see cref="IntPtr.Zero" />.
/// </param>
/// <returns>HRESULT</returns>
/// <remarks>
/// For more information, see
/// <see href="https://msdn.microsoft.com/en-us/library/windows/desktop/dd370873(v=vs.85).aspx" />.
/// </remarks>
public unsafe int GetServiceNative(Guid riid, out IntPtr ppv)
{
fixed(void *pppv = &ppv)
{
return(LocalInterop.Calli(UnsafeBasePtr, &riid, pppv, ((void **)(*(void **)UnsafeBasePtr))[14]));
}
}
/// <summary>
/// Deletes a previous registration by the client to receive notifications.
/// </summary>
/// <param name="notifications">The instance of the <see cref="IAudioSessionEvents"/> object which got registered previously by the <see cref="RegisterAudioSessionNotification"/> method.</param>
/// <returns>HRESULT</returns>
public unsafe int UnregisterAudioSessionNotificationNative(IAudioSessionEvents notifications)
{
int result = 0;
if (_sessionEventHandler.Contains(notifications))
{
IntPtr ptr = notifications != null
? Marshal.GetComInterfaceForObject(notifications, typeof(IAudioSessionEvents))
: IntPtr.Zero;
try
{
result = LocalInterop.Calli(UnsafeBasePtr, ptr.ToPointer(), ((void **)(*(void **)UnsafeBasePtr))[11]);
}
finally
{
if (ptr != IntPtr.Zero)
{
Marshal.Release(ptr);
}
}
_sessionEventHandler.Remove(notifications);
}
return(result);
}
/// <summary>
/// Indicates whether the endpoint is associated with a rendering device or a capture device.
/// </summary>
/// <param name="dataFlow">A variable into which the method writes the data-flow direction of the endpoint device.</param>
/// <returns>HRESULT</returns>
/// <remarks>Use the <see cref="DataFlow"/> property instead.</remarks>
public unsafe int GetDataFlowNative(out DataFlow dataFlow)
{
fixed(void *p = &dataFlow)
{
return(LocalInterop.Calli(UnsafeBasePtr, p, ((void **)*(void **)UnsafeBasePtr)[3]));
}
}
/// <summary>
/// Registers the application to receive a notification when a session is created.
/// <seealso cref="RegisterSessionNotificationNative"/>
/// </summary>
/// <param name="sessionNotification">The application's implementation of the <see cref="IAudioSessionNotification"/> interface.</param>
/// <returns>HRESULT</returns>
/// <remarks>
/// Use the <see cref="AudioSessionNotification"/> class as the default implementation for the <paramref name="sessionNotification"/> parameter.
///
/// <c>Note:</c> Make sure to call the <see cref="RegisterSessionNotificationNative"/> from an MTA-Thread. Also make sure to enumerate all sessions after calling this method.
/// </remarks>
public unsafe int RegisterSessionNotificationNative(IAudioSessionNotification sessionNotification)
{
int result = 0;
if (!_sessionNotifications.Contains(sessionNotification))
{
IntPtr ptr = sessionNotification != null
? Marshal.GetComInterfaceForObject(sessionNotification, typeof(IAudioSessionNotification))
: IntPtr.Zero;
try
{
result = LocalInterop.Calli(
UnsafeBasePtr,
ptr,
((void **)(*(void **)UnsafeBasePtr))[6]);
}
finally
{
if (ptr != IntPtr.Zero)
{
Marshal.Release(ptr);
}
}
_sessionNotifications.Add(sessionNotification);
}
return(result);
}
/// <summary>
/// The GetCharacteristics method is reserved for future use.
/// </summary>
/// <param name="characteristics">Value that indicates the characteristics of the audio clock.</param>
/// <returns>HREUSLT</returns>
public unsafe int GetCharacteristicsNative(out int characteristics)
{
fixed(void *p = &characteristics)
{
return(LocalInterop.Calli(UnsafeBasePtr, p, ((void **)(*(void **)UnsafeBasePtr))[5]));
}
}
//--
/// <summary>
/// Registers the application to receive ducking notifications.
/// <seealso cref="RegisterDuckNotification"/>
/// </summary>
/// <param name="sessionId">A string that contains a session instance identifier. Applications that are playing a media stream and want to provide custom stream attenuation or ducking behavior, pass their own session instance identifier.
/// Other applications that do not want to alter their streams but want to get all the ducking notifications must pass NULL.</param>
/// <param name="sessionNotification">Instance of any object which implements the <see cref="IAudioVolumeDuckNotification"/> and which should receive duck notifications.</param>
/// <returns>HRESULT</returns>
public unsafe int RegisterDuckNotificationNative(string sessionId,
IAudioVolumeDuckNotification sessionNotification)
{
int result = 0;
if (!_volumeDuckNotifications.Contains(sessionNotification))
{
IntPtr ptr = sessionNotification != null
? Marshal.GetComInterfaceForObject(sessionNotification, typeof(IAudioVolumeDuckNotification))
: IntPtr.Zero;
IntPtr ptr0 = sessionId != null?Marshal.StringToHGlobalUni(sessionId) : IntPtr.Zero;
try
{
result = LocalInterop.Calli(UnsafeBasePtr, (void *)ptr0, (void *)ptr,
((void **)(*(void **)UnsafeBasePtr))[8]);
}
finally
{
if (ptr != IntPtr.Zero)
{
Marshal.Release(ptr);
}
if (ptr0 != IntPtr.Zero)
{
Marshal.FreeHGlobal(ptr0);
}
}
_volumeDuckNotifications.Add(sessionNotification);
}
return(result);
}
/// <summary>
/// Retrieves the current device state.
/// </summary>
/// <param name="state">The variable which will receive the <see cref="CoreAudioAPI.DeviceState"/> of the device.</param>
/// <returns>HRESULT</returns>
public unsafe int GetStateNative(out DeviceState state)
{
fixed(void *pstate = &state)
{
return(LocalInterop.Calli(UnsafeBasePtr, unchecked (pstate), ((void **)(*(void **)UnsafeBasePtr))[6]));
}
}
/// <summary>
/// Gets the number of channels in the audio stream that enters
/// or leaves the audio endpoint device.
/// </summary>
/// <param name="channelCount">Retrieves the number of channels in the audio stream.</param>
/// <returns>HRESULT</returns>
public unsafe int GetChannelCountNative(out int channelCount)
{
fixed(void *ptr = &channelCount)
{
return(LocalInterop.Calli(UnsafeBasePtr, ptr, ((void **)(*(void **)UnsafeBasePtr))[5]));
}
}
