private void PlatformInitializeFormat(byte[] header, byte[] buffer, int bufferSize, int loopStart, int loopLength)
{
var format = BitConverter.ToInt16(header, 0);
var channels = BitConverter.ToInt16(header, 2);
var sampleRate = BitConverter.ToInt32(header, 4);
var blockAlignment = BitConverter.ToInt16(header, 12);
var sampleBits = BitConverter.ToInt16(header, 14);
WaveFormat waveFormat;
if (format == 1)
{
waveFormat = new WaveFormat(sampleRate, sampleBits, channels);
}
else if (format == 2)
{
waveFormat = new WaveFormatAdpcm(sampleRate, channels, blockAlignment);
}
else if (format == 3)
{
waveFormat = WaveFormat.CreateIeeeFloatWaveFormat(sampleRate, channels);
}
else
{
throw new NotSupportedException("Unsupported wave format!");
}
CreateBuffers(waveFormat,
ToDataStream(0, buffer, bufferSize),
loopStart,
loopLength);
}
/// <summary>
/// Helper function to retrieve a WaveFormat structure from a pointer
/// </summary>
/// <param name="pointer">Pointer to the WaveFormat rawdata</param>
/// <returns>WaveFormat structure</returns>
public unsafe static WaveFormat MarshalFrom(void *pointer)
{
if (pointer == null)
{
throw new InvalidOperationException("Pointer cannot be null");
}
var pcmWaveFormat = *(__PcmNative *)pointer;
var encoding = pcmWaveFormat.waveFormatTag;
// Load simple PcmWaveFormat if channels <= 2 and encoding is Pcm, IeeFloat, Wmaudio2, Wmaudio3
// See http://msdn.microsoft.com/en-us/library/microsoft.directx_sdk.xaudio2.waveformatex%28v=vs.85%29.aspx
if (pcmWaveFormat.channels <= 2 &&
(encoding == WaveFormatEncoding.Pcm || encoding == WaveFormatEncoding.IeeeFloat || encoding == WaveFormatEncoding.WindowsMediaAudio || encoding == WaveFormatEncoding.WindowsMediaAudioProfessional))
{
var waveFormat = new WaveFormat();
waveFormat.__MarshalFrom(ref pcmWaveFormat);
return(waveFormat);
}
if (encoding == WaveFormatEncoding.Extensible)
{
var waveFormat = new WaveFormatExtensible();
waveFormat.__MarshalFrom(ref *(WaveFormatExtensible.__Native *)pointer);
return(waveFormat);
}
if (encoding == WaveFormatEncoding.Adpcm)
{
var waveFormat = new WaveFormatAdpcm();
waveFormat.__MarshalFrom(ref *(WaveFormatAdpcm.__Native *)pointer);
return(waveFormat);
}
throw new InvalidOperationException(string.Format("Unsupported WaveFormat [{0}]", encoding));
}
