public void Write(AudioEvent anEvent)
{
if (null == anEvent ||
anEvent.DataBuffer == null ||
anEvent.DataLength < 1)
throw new ArgumentNullException("WaveSpeaker::Write(anEvent)");
try
{
// Get an available buffer
WAVEHDR aHeader = fAvailableBuffers.Dequeue();
// Prepare the header
UnprepareHeader(aHeader);
PrepareHeader(aHeader);
// copy the data to the buffer
Marshal.Copy(anEvent.DataBuffer, 0, aHeader.lpData, anEvent.DataBuffer.Length);
// Write it out to the device
Write(aHeader);
}
catch (Exception e)
{
Console.WriteLine("WaveSpeaker::Write - {0}", e.Message);
}
}
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;
}
void SendAudioEvent(AudioEvent anEvent)
{
BufferChunk chunk = new BufferChunk(anEvent.DataLength + 100);
//public ushort cbSize;
//public ushort wBitsPerSample;
//public int nAvgBytesPerSec;
//public short nBlockAlign;
//public short nChannels;
//public int nSamplesPerSec;
//public short wFormatTag;
chunk += (int)anEvent.WaveFormat.nChannels;
chunk += (int)anEvent.WaveFormat.nSamplesPerSec;
chunk += (int)anEvent.WaveFormat.wBitsPerSample;
chunk += (int)anEvent.DataLength;
chunk += anEvent.DataBuffer;
fAudioChannel.Send(chunk);
}
unsafe public static double GetAmplitudeAverage(AudioEvent anEvent)
{
GCHandle gcHandle = GCHandle.Alloc(anEvent.DataBuffer, GCHandleType.Pinned);
double avg = 0;
double sum = 0;
if (16 == anEvent.WaveFormat.wBitsPerSample)
{
// Find the average assuming 'short' as the data type
short* values = (short *)(gcHandle.AddrOfPinnedObject());
int numOfDatum = (int)anEvent.DataLength / 2;
for (int i = 0; i < numOfDatum; i++)
{
sum += values[i];
}
avg = sum / numOfDatum;
}
else if (8 == anEvent.WaveFormat.wBitsPerSample)
{
// Find the average assuming 'byte' as the data type
byte * values = (byte*)gcHandle.AddrOfPinnedObject();
int numOfDatum = (int)anEvent.DataLength;
for (int i = 0; i < numOfDatum; i++)
{
sum += Math.Abs(values[i] - 128);
}
avg = sum / numOfDatum;
}
gcHandle.Free();
return avg;
}
