/// <summary>
/// Creates a new ACM stream to convert one format to another, using a
/// specified driver identified and wave filter
/// </summary>
/// <param name="driverId">the driver identifier</param>
/// <param name="sourceFormat">the source format</param>
/// <param name="waveFilter">the wave filter</param>
public AcmStream(IntPtr driverId, WaveFormatProvider sourceFormat, WaveFilter waveFilter)
{
int sourceBufferSize = System.Math.Max(16384, sourceFormat.AverageBytesPerSecond);
this.sourceFormat = sourceFormat;
sourceBufferSize -= (sourceBufferSize % sourceFormat.BlockAlign);
MmException.Try(AcmInterop.acmDriverOpen(out driverHandle, driverId, 0), "acmDriverOpen");
MmException.Try(AcmInterop.acmStreamOpen(out streamHandle, driverHandle,
sourceFormat, sourceFormat, waveFilter, IntPtr.Zero, IntPtr.Zero, AcmStreamOpenFlags.NonRealTime), "acmStreamOpen");
streamHeader = new AcmStreamHeader(streamHandle, sourceBufferSize, SourceToDest(sourceBufferSize));
}
/// <summary>
/// Creates a new ACM stream to convert one format to another. Note that
/// not all conversions can be done in one step
/// </summary>
/// <param name="sourceFormat">The source audio format</param>
/// <param name="destFormat">The destination audio format</param>
public AcmStream(WaveFormatProvider sourceFormat, WaveFormatProvider destFormat)
{
try
{
streamHandle = IntPtr.Zero;
this.sourceFormat = sourceFormat;
int sourceBufferSize = System.Math.Max(65536, sourceFormat.AverageBytesPerSecond);
sourceBufferSize -= (sourceBufferSize % sourceFormat.BlockAlign);
MmException.Try(AcmInterop.acmStreamOpen(out streamHandle, IntPtr.Zero, sourceFormat, destFormat, null, IntPtr.Zero, IntPtr.Zero, AcmStreamOpenFlags.NonRealTime), "acmStreamOpen");
int destBufferSize = SourceToDest(sourceBufferSize);
streamHeader = new AcmStreamHeader(streamHandle, sourceBufferSize, destBufferSize);
driverHandle = IntPtr.Zero;
}
catch
{
// suppress the finalise and clean up resources
Dispose();
throw;
}
}