public static AudioEvent CreateInstance(IntPtr data, int dataLength, double timeStamp, WAVEFORMATEX wfx)
{
if (data == IntPtr.Zero || dataLength < 1)
throw new ArgumentException("data is null or empty");
AudioEvent anEvent = new AudioEvent(data, dataLength, timeStamp, wfx);
return anEvent;
}
private AudioEvent(IntPtr data, int dataLength, double timeStamp, WAVEFORMATEX wfx)
{
DataBuffer = new byte[dataLength];
DataLength = dataLength;
SampleTime = timeStamp;
WaveFormat = wfx;
//copy the data to the byte buffer
Marshal.Copy(data, DataBuffer, 0, dataLength);
}
public WaveOutputPort(int deviceID, WAVEFORMATEX wf)
{
fCallbackMethod = new WaveCallback(this.DefaultAudioCallback);
DeviceHandle = null;
DeviceID = deviceID;
WaveFormat = wf;
PCMFormat = PCMAudioFormat.CreateFromWaveFormat(wf);
Open();
}
public static double GetAmplitudeRange(WAVEFORMATEX wfx)
{
double maxRange = 0;
if (16 == wfx.wBitsPerSample)
maxRange = short.MaxValue/2;
if (8 == wfx.wBitsPerSample)
maxRange = byte.MaxValue/2;
return maxRange;
}
public WinMMAudioDevice(int deviceID, WAVEFORMATEX wf)
{
fCallbackMethod = new WaveCallback(this.DefaultAudioCallback);
fDeviceHandle = IntPtr.Zero;
fDeviceID = deviceID;
fWaveFormat = wf;
fPCMFormat = PCMAudioFormat.CreateFromWaveFormat(wf);
//if (callbackProc != null)
// fCallbackProcedure = callbackProc;
//else
// fCallbackProcedure = DefaultAudioCallback;
}
public static WAVEFORMATEX CreatePCMFormat(int channels, int sampleRate, int bitsPerSample)
{
int bytesPerSample = bitsPerSample / 8;
WAVEFORMATEX wfx = new WAVEFORMATEX();
wfx.wFormatTag = WAVEFORMAT.WAVE_FORMAT_PCM;
wfx.nChannels = (short)channels;
wfx.wBitsPerSample = (ushort)bitsPerSample; // 8 or 16
wfx.nSamplesPerSec = (ushort)sampleRate;
wfx.nAvgBytesPerSec = (int)(sampleRate * channels * bytesPerSample);
wfx.nBlockAlign = (short)(channels * bytesPerSample);
wfx.cbSize = 0;
return wfx;
}
public WaveInputPort(int deviceID, WAVEFORMATEX wf, double latency)
:this(deviceID, wf.nChannels, wf.nSamplesPerSec, wf.wBitsPerSample, latency)
{
}
public static PCMAudioFormat CreateFromWaveFormat(WAVEFORMATEX wfx)
{
PCMAudioFormat af = new PCMAudioFormat(wfx.nChannels, wfx.wBitsPerSample, (int)wfx.nSamplesPerSec);
return af;
}
public static extern int SendMessageW([In] IntPtr hWnd, int Msg, uint wParam, ref WAVEFORMATEX waveFormat);
public int capGetAudioFormat(ref WAVEFORMATEX s, int wSize)
{
int retValue = SendMessageW(fWindowHandle, Vfw.WM_CAP_GET_AUDIOFORMAT, (uint)wSize, ref s);
return retValue;
}
public bool capSetAudioFormat(ref WAVEFORMATEX s, int wSize)
{
return 1 == SendMessageW(fWindowHandle, Vfw.WM_CAP_SET_AUDIOFORMAT, (uint)wSize, ref s);
}
