private IWaveSource GetSoundSource(Stream stream)
{
var magic = new byte[8];
stream.Read(magic, 0, 8);
stream.Position = 0;
if (VisualC.CompareMemory(magic, _mp3Magic, 3) == 0 ||
VisualC.CompareMemory(magic, _mp3Magic2, 2) == 0)
{
return(new DmoMp3Decoder(stream));
}
if (VisualC.CompareMemory(magic, _oggMagic, 4) == 0)
{
stream.Position = 0x1C;
stream.Read(magic, 0, 8);
stream.Position = 0;
if (VisualC.CompareMemory(magic, _opusMagic, 8) == 0)
{
throw new NotSupportedException("Ogg Opus is not currently supported.");
}
var decoder = new VorbisDecoder(stream);
var converter = new SampleToPcm16(decoder);
return(converter);
}
if (VisualC.CompareMemory(magic, _flacMagic, 4) == 0)
{
return(new FlacFile(stream, FlacPreScanMode.Sync));
}
if (VisualC.CompareMemory(magic, _riffMagic, 4) == 0)
{
stream.Position = 8;
stream.Read(magic, 0, 7);
if (VisualC.CompareMemory(magic, _waveMagic, 7) == 0)
{
return(new MediaFoundationDecoder(stream));
}
stream.Position = 0;
}
if (VisualC.CompareMemory(magic, _m4aMagic, 7) == 0)
{
return(new MediaFoundationDecoder(stream));
}
throw new FormatException("The stream is an unsupported format.");
}
// This is split out so that it can run late in the loading process (because it saturates the CPU)
public void FillSoundEffectArray(SafeSoundEffect[] sounds)
{
if (!AudioDevice.Available)
{
return;
}
if (vorbisPointer == null)
{
throw new ObjectDisposedException(typeof(AudioPackage).Name);
}
// IMPORTANT: This is lock-free, because each entry only writes to its own slot (everything else is read-only)
int count = sounds.Length;
//for (int i = 0; i < count; i++)
Parallel.ForEach(Enumerable.Range(0, count), i =>
{
var entry = GetEntryByIndex(i);
sounds[i].inner = VorbisDecoder.DecodeVorbis(entry.VorbisStart, entry.VorbisEnd,
entry.ExpectedSamples, entry.LoopStart, entry.LoopLength);
});
}
