private void GetAudioRenderClient()
{
object result;
var IID_AUDIO_RENDER_CLIENT = typeof(IAudioRenderClient).GUID;
Marshal.ThrowExceptionForHR(_realAudioClient.GetService(IID_AUDIO_RENDER_CLIENT, out result));
_AudioRenderClient = new AudioRenderClient(result as IAudioRenderClient);
}
private static IAudioCaptureClient CreateRenderClient(IAudioClient audioClient)
{
object client;
audioClient.GetService(typeof(IAudioCaptureClient).GUID, out client);
return(client as IAudioCaptureClient);
}
private void InitializeAudio(AudioDataFlow audioFlow, IMMDeviceEnumerator deviceEnumerator)
{
//Get Audio Device
COMResult result = deviceEnumerator.GetDefaultAudioEndpoint(audioFlow, EndPointRole.eMultimedia, out _audioDevice);
//Register End point notification
_notifyClient = new MMNotificationClient();
result = deviceEnumerator.RegisterEndpointNotificationCallback(_notifyClient);
//Get Audio Client from device
result = _audioDevice.Activate(typeof(IAudioClient).GUID, 0, IntPtr.Zero, out object obj);
_audioClient = (IAudioClient)obj;
//Get Audio Meter from device
result = _audioDevice.Activate(typeof(IAudioMeterInformation).GUID, 0, IntPtr.Zero, out obj);
_audioMeter = (IAudioMeterInformation)obj;
//Initialize Audio Client.
_sessionGuid = new Guid();
result = _audioClient.GetMixFormat(out waveFormat);
AudioClientStreamFlags streamFlag = AudioClientStreamFlags.None;
if (audioFlow == AudioDataFlow.eRender)
{
streamFlag = AudioClientStreamFlags.Loopback;
}
result = _audioClient.Initialize(AudioClientMode.Shared, streamFlag, 10000000, 0, waveFormat, ref _sessionGuid);
//Get Capture Client.
result = _audioClient.GetService(typeof(IAudioCaptureClient).GUID, out obj);
Marshal.ThrowExceptionForHR((int)result);
_audioCaptureClient = (IAudioCaptureClient)obj;
result = _audioClient.Start();
//Change wave format here
SetupWaveFormat(waveFormat);
}
private void GetAudioCaptureClient()
{
object result;
int hr = _RealClient.GetService(ref IID_IAudioCaptureClient, out result);
Marshal.ThrowExceptionForHR(hr);
_audioCaptureClient = new AudioCaptureClient(this, result as IAudioCaptureClient);
}
internal PlaybackClient_WindowsCoreApi(IAudioClient IAudioClient, System.IO.Stream Stream, int NumChannel, int FrameSize, uint SamplesRate, Type DataFormat)
{
_IAudioClient = IAudioClient;
_IAudioClient.GetService(ref IID_IAudioRenderClient, out _IAudioRenderClient);
_IAudioClient.GetBufferSize(out _BufferFrameCount);
_Stream = Stream;
_FrameSize = FrameSize;
_BufferDuration = _BufferFrameCount / (SamplesRate / 1000);
_FullBuffer = new byte[_FrameSize * _BufferFrameCount];
_Thread = new System.Threading.Thread(Loop);
_ChannelCount = NumChannel;
_SampleRate = SamplesRate;
_Format = DataFormat;
}
protected T GetService <T>(Guid guid) where T : class
{
object obj; int hr = audioClient.GetService(guid, out obj);
if (hr != 0)
{
Marshal.ThrowExceptionForHR(hr);
}
T service = obj as T;
if (service == null)
{
throw new NotSupportedException();
}
return(service);
}
private void StartSilenceGeneration()
{
IntPtr mixFormatPtr = IntPtr.Zero;
try
{
Checked(_endpoint.Activate(ref IAudioClientId, ClsCtxEnum.All, IntPtr.Zero, out var obj), "Silence.Activate");
_audioClientForRendering = (IAudioClient)obj;
Checked(_audioClientForRendering.GetMixFormat(out mixFormatPtr), "Silence.GetMixFormat");
WaveFormatEx format = (WaveFormatEx)Marshal.PtrToStructure(mixFormatPtr, typeof(WaveFormatEx));
CheckFormat(format);
Checked(_audioClientForRendering.Initialize(AudioClientShareModeEnum.Shared, AudioClientStreamFlagsEnum.None, 10_000_000 * 5, 0, mixFormatPtr, Guid.Empty), "Silence.Initialize");
Checked(_audioClientForRendering.GetBufferSize(out var bufferSize), "Silence.GetBufferSize");
Checked(_audioClientForRendering.GetService(IAudioRenderClientId, out var renderObj), "Silence.GetService");
_audioRenderClient = (IAudioRenderClient)renderObj;
Checked(_audioClientForRendering.Start(), "Silence.Start");
_silenceThread = new Thread(() => SilenceGenerationRoutine(bufferSize, format));
_silenceThread.Name = "Silence generator";
_silenceThread.Start();
}
catch (Exception e)
{
ReleaseComObject(ref _audioClientForRendering);
ReleaseComObject(ref _audioRenderClient);
Core.LogError(e, "Faied to StartSilenceGeneration");
}
finally
{
if (mixFormatPtr != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(mixFormatPtr);
}
}
}
public CoreAudio(bool microphone = false)
{
const uint REFTIMES_PER_SEC = 10000000;
const uint CLSCTX_INPROC_SERVER = 1;
Guid clsid = new Guid("BCDE0395-E52F-467C-8E3D-C4579291692E");
Guid IID_IUnknown = new Guid("00000000-0000-0000-C000-000000000046");
oEnumerator = null;
uint hResult = CoCreateInstance(ref clsid, null, CLSCTX_INPROC_SERVER, ref IID_IUnknown, out oEnumerator);
if (hResult != 0 || oEnumerator == null)
{
throw new Exception("CoCreateInstance() pInvoke failed");
}
iMde = oEnumerator as IMMDeviceEnumerator;
if (iMde == null)
{
throw new Exception("COM cast failed to IMMDeviceEnumerator");
}
IntPtr pDevice = IntPtr.Zero;
//iMde.EnumAudioEndpoints(EDataFlow.eCapture, DEVICE_STATE_ACTIVE,ref pDevice);
int retVal;
if (microphone)
{
retVal = iMde.GetDefaultAudioEndpoint(EDataFlow.eCapture, ERole.eConsole, ref pDevice);
}
else
{
retVal = iMde.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eConsole, ref pDevice);
}
if (retVal != 0)
{
throw new Exception("IMMDeviceEnumerator.GetDefaultAudioEndpoint()");
}
//int dwStateMask = DEVICE_STATE_ACTIVE | DEVICE_STATE_NOTPRESENT | DEVICE_STATE_UNPLUGGED;
//IntPtr pCollection = IntPtr.Zero;
//retVal = iMde.EnumAudioEndpoints(EDataFlow.eRender, dwStateMask, ref pCollection);
//if (retVal != 0)
//{
// throw new Exception("IMMDeviceEnumerator.EnumAudioEndpoints()");
//}
imd = (IMMDevice)System.Runtime.InteropServices.Marshal.GetObjectForIUnknown(pDevice);
if (imd == null)
{
throw new Exception("COM cast failed to IMMDevice");
}
Guid iid = new Guid("5CDF2C82-841E-4546-9722-0CF74078229A");
uint dwClsCtx = (uint)CLSCTX.CLSCTX_ALL;
IntPtr pActivationParams = IntPtr.Zero;
IntPtr pEndPoint = IntPtr.Zero;
retVal = imd.Activate(iid, dwClsCtx, pActivationParams, out pEndPoint);
if (retVal != 0)
{
throw new Exception("IMMDevice.Activate()");
}
iAudioEndpoint = (IAudioEndpointVolume)System.Runtime.InteropServices.Marshal.GetObjectForIUnknown(pEndPoint);
if (iAudioEndpoint == null)
{
throw new Exception("COM cast failed to IAudioEndpointVolume");
}
iid = new Guid("1CB9AD4C-DBFA-4c32-B178-C2F568A703B2");
dwClsCtx = (uint)CLSCTX.CLSCTX_ALL;
pActivationParams = IntPtr.Zero;
pEndPoint = IntPtr.Zero;
retVal = imd.Activate(iid, dwClsCtx, pActivationParams, out pEndPoint);
if (retVal != 0)
{
throw new Exception("IAudioClient.Activate() " + Convert.ToString(retVal, 2));
}
iAudioClient = (IAudioClient)System.Runtime.InteropServices.Marshal.GetObjectForIUnknown(pEndPoint);
if (iAudioClient == null)
{
throw new Exception("COM cast failed to iAudioClient");
}
ulong processInterval;
ulong minimumInterval;
retVal = iAudioClient.GetDevicePeriod(out processInterval, out minimumInterval);
if (retVal != 0)
{
throw new Exception("iAudioClient.GetDevicePeriod()");
}
waveformat = new WAVEFORMATEX();
waveformat.wFormatTag = (ushort)WaveFormatEncoding.Pcm;
waveformat.nChannels = 2;
waveformat.nBlockAlign = 4;
waveformat.wBitsPerSample = 16;
waveformat.nSamplesPerSec = 44100;
waveformat.cbSize = 0;
waveformat.nAvgBytesPerSec = 176400;
IntPtr reqForm = Marshal.AllocHGlobal(Marshal.SizeOf(waveformat));
Marshal.StructureToPtr(waveformat, reqForm, false);
IntPtr propForm = Marshal.AllocHGlobal(Marshal.SizeOf(waveformat));
retVal = iAudioClient.IsFormatSupported(AUDCLNT_SHAREMODE.AUDCLNT_SHAREMODE_SHARED, reqForm, out propForm);
if (retVal != 0)
{
throw new Exception("IAudioClient.IsFormatSupported()");
}
if (microphone)
{
retVal = iAudioClient.Initialize(AUDCLNT_SHAREMODE.AUDCLNT_SHAREMODE_EXCLUSIVE, 0, 2000000, 0, reqForm, Guid.Empty);
}
else
{
retVal = iAudioClient.Initialize(AUDCLNT_SHAREMODE.AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_LOOPBACK, 2000000, 0, reqForm, Guid.Empty);
}
if (retVal != 0)
{
throw new Exception("IAudioClient.Initialize() " + retVal);
}
uint buffersize = 0;
retVal = iAudioClient.GetBufferSize(out buffersize);
if (retVal != 0)
{
throw new Exception("IAudioClient.GetBufferSize()");
}
iid = new Guid("C8ADBD64-E71E-48a0-A4DE-185C395CD317");
IntPtr capclient = IntPtr.Zero;
retVal = iAudioClient.GetService(iid, out capclient);
if (retVal != 0)
{
throw new Exception("IAudioClient.GetService()");
}
iAudioCaptureClient = (IAudioCaptureClient)System.Runtime.InteropServices.Marshal.GetObjectForIUnknown(capclient);
if (iAudioCaptureClient == null)
{
throw new Exception("COM cast failed to iAudioCaptureClient");
}
hnsActualDuration = (double)(REFTIMES_PER_SEC * buffersize / waveformat.nSamplesPerSec); // 8391 smallest possible value
recordingthread = new Thread(recordingloop);
recordingthread.IsBackground = false;
recordingthread.Start();
}
public WaveFormatEx Open()
{
StopSilenceThread();
Log.Information("Opening DesktopAudio");
IMMDeviceEnumerator deviceEnumerator = null;
IntPtr mixFormatPtr = IntPtr.Zero;
try
{
bool render = true;
deviceEnumerator = Activator.CreateInstance(typeof(MMDeviceEnumerator)) as IMMDeviceEnumerator;
var res = deviceEnumerator.GetDefaultAudioEndpoint(
render ? DataFlowEnum.Render : DataFlowEnum.Capture,
render ? RoleEnum.Console : RoleEnum.Communications,
out _endpoint);
if (render)
{
StartSilenceGeneration();
}
Checked(_endpoint.Activate(ref IAudioClientId, ClsCtxEnum.All, IntPtr.Zero, out var obj), "Activate");
_audioClient = (IAudioClient)obj;
Checked(_audioClient.GetMixFormat(out mixFormatPtr), "GetMixFormat");
WaveFormatEx outputFormat = (WaveFormatEx)Marshal.PtrToStructure(mixFormatPtr, typeof(WaveFormatEx));
if (!render) // for render it is checked in the StartSilenceGeneration();
{
CheckFormat(outputFormat);
}
_bytesPerFrame = outputFormat.BlockAlign;
var flags = AudioClientStreamFlagsEnum.StreamFlagsEventCallback | (render ? AudioClientStreamFlagsEnum.StreamFlagsLoopback : AudioClientStreamFlagsEnum.None);
Checked(_audioClient.Initialize(AudioClientShareModeEnum.Shared, flags, 10_000_000 * 5, 0, mixFormatPtr, Guid.Empty), "Initialize");
Checked(_audioClient.GetService(IAudioCaptureClientId, out var captureObj), "GetService");
_audioCaptureClient = (IAudioCaptureClient)captureObj;
#pragma warning disable CS0618 // Type or member is obsolete
Checked(_audioClient.SetEventHandle(_dataAvailable.Handle), "SetEventHandle");
#pragma warning restore CS0618 // Type or member is obsolete
Checked(_audioClient.Start(), "Start");
return(outputFormat);
}
catch (Exception e)
{
Core.LogError(e, "Open desktop audio failed");
StopSilenceThread();
ReleaseComFields();
throw;
}
finally
{
if (mixFormatPtr != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(mixFormatPtr);
}
ReleaseComObject(ref deviceEnumerator);
}
}
