private void DecodeFormat(int format, out MiniFormatTag codec, out int channels, out int rate, out int alignment)
{
if (_version == 1)
{
// I'm not 100% sure if the following is correct
// version 1:
// 1 00000000 000101011000100010 0 001 0
// | | | | | |
// | | | | | wFormatTag
// | | | | nChannels
// | | | ???
// | | nSamplesPerSec
// | wBlockAlign
// wBitsPerSample
codec = (MiniFormatTag)((format) & ((1 << 1) - 1));
channels = (format >> (1)) & ((1 << 3) - 1);
rate = (format >> (1 + 3 + 1)) & ((1 << 18) - 1);
alignment = (format >> (1 + 3 + 1 + 18)) & ((1 << 8) - 1);
//bits = (format >> (1 + 3 + 1 + 18 + 8)) & ((1 << 1) - 1);
/*} else if(wavebankheader.dwVersion == 23) { // I'm not 100% sure if the following is correct
* // version 23:
* // 1000000000 001011101110000000 001 1
* // | | | | |
* // | | | | ???
* // | | | nChannels?
* // | | nSamplesPerSec
* // | ???
* // !!!UNKNOWN FORMAT!!!
*
* //codec = -1;
* //chans = (wavebankentry.Format >> 1) & ((1 << 3) - 1);
* //rate = (wavebankentry.Format >> 4) & ((1 << 18) - 1);
* //bits = (wavebankentry.Format >> 31) & ((1 << 1) - 1);
* codec = (wavebankentry.Format ) & ((1 << 1) - 1);
* chans = (wavebankentry.Format >> (1) ) & ((1 << 3) - 1);
* rate = (wavebankentry.Format >> (1 + 3) ) & ((1 << 18) - 1);
* align = (wavebankentry.Format >> (1 + 3 + 18) ) & ((1 << 9) - 1);
* bits = (wavebankentry.Format >> (1 + 3 + 18 + 9)) & ((1 << 1) - 1); */
}
else
{
// 0 00000000 000111110100000000 010 01
// | | | | |
// | | | | wFormatTag
// | | | nChannels
// | | nSamplesPerSec
// | wBlockAlign
// wBitsPerSample
codec = (MiniFormatTag)((format) & ((1 << 2) - 1));
channels = (format >> (2)) & ((1 << 3) - 1);
rate = (format >> (2 + 3)) & ((1 << 18) - 1);
alignment = (format >> (2 + 3 + 18)) & ((1 << 8) - 1);
//bits = (info.Format >> (2 + 3 + 18 + 8)) & ((1 << 1) - 1);
}
}
private void PlatformInitializeXact(MiniFormatTag codec, byte[] buffer, int channels, int sampleRate, int blockAlignment, int loopStart, int loopLength, out TimeSpan duration)
{
if (codec == MiniFormatTag.Adpcm)
{
PlatformInitializeAdpcm(buffer, 0, buffer.Length, sampleRate, (AudioChannels)channels, (blockAlignment + 16) * channels, loopStart, loopLength);
duration = TimeSpan.FromSeconds(SoundBuffer.Duration);
return;
}
throw new NotSupportedException("Unsupported sound format!");
}
// Only used from XACT WaveBank.
internal SoundEffect(MiniFormatTag codec, byte[] buffer, int channels, int sampleRate, int blockAlignment, int loopStart, int loopLength)
{
// Handle the common case... the rest is platform specific.
if (codec == MiniFormatTag.Pcm)
{
_duration = TimeSpan.FromSeconds((float)buffer.Length / (sampleRate * blockAlignment));
PlatformInitializePcm(buffer, 0, buffer.Length, sampleRate, (AudioChannels)channels, loopStart, loopLength);
return;
}
PlatformInitializeXact(codec, buffer, channels, sampleRate, blockAlignment, loopStart, loopLength, out _duration);
}
private void PlatformInitializeXact(MiniFormatTag codec, byte[] buffer, int channels, int sampleRate, int blockAlignment, int loopStart, int loopLength, out TimeSpan duration)
{
if (codec == MiniFormatTag.Adpcm)
{
duration = TimeSpan.FromSeconds((float)loopLength / sampleRate);
CreateBuffers(new WaveFormatAdpcm(sampleRate, channels, blockAlignment),
ToDataStream(0, buffer, buffer.Length),
loopStart,
loopLength);
return;
}
throw new NotSupportedException("Unsupported sound format!");
}
// Only used from XACT WaveBank.
internal SoundEffect(MiniFormatTag codec, byte[] buffer, int channels, int sampleRate, int blockAlignment, int loopStart, int loopLength)
{
Initialize();
if (_systemState != SoundSystemState.Initialized)
{
throw new NoAudioHardwareException("Audio has failed to initialize. Call SoundEffect.Initialize() before sound operation to get more specific errors.");
}
// Handle the common case... the rest is platform specific.
if (codec == MiniFormatTag.Pcm)
{
_duration = TimeSpan.FromSeconds((float)buffer.Length / (sampleRate * blockAlignment));
PlatformInitializePcm(buffer, 0, buffer.Length, 16, sampleRate, (AudioChannels)channels, loopStart, loopLength);
return;
}
PlatformInitializeXact(codec, buffer, channels, sampleRate, blockAlignment, loopStart, loopLength, out _duration);
}
private void PlatformInitializeXact(MiniFormatTag codec, byte[] buffer, int channels, int sampleRate, int blockAlignment, int loopStart, int loopLength, out TimeSpan duration)
{
throw new NotSupportedException("Unsupported sound format!");
}
