public PCMStream(byte[] wavData)
{
_allocatedHGlobal = Marshal.AllocHGlobal(wavData.Length);
Marshal.Copy(wavData, 0, _allocatedHGlobal, wavData.Length);
RIFFHeader *header = (RIFFHeader *)_allocatedHGlobal;
_bps = header->_fmtChunk._bitsPerSample;
_numChannels = header->_fmtChunk._channels;
_frequency = (int)header->_fmtChunk._samplesSec;
_numSamples = (int)(header->_dataChunk._chunkSize / header->_fmtChunk._blockAlign);
_source = (short *)((byte *)_allocatedHGlobal + header->GetSize());
_samplePos = 0;
_looped = false;
_loopStart = 0;
_loopEnd = _numSamples;
smplLoop[] loops = header->_smplLoops;
if (loops.Length > 0)
{
_looped = true;
_loopStart = (int)loops[0]._dwStart;
_loopEnd = (int)loops[0]._dwEnd;
}
}
internal PCMStream(FileMap map)
{
_sourceMap = map;
RIFFHeader *header = (RIFFHeader *)_sourceMap.Address;
_bps = header->_fmtChunk._bitsPerSample;
_numChannels = header->_fmtChunk._channels;
_frequency = (int)header->_fmtChunk._samplesSec;
_numSamples = (int)(header->_dataChunk._chunkSize / header->_fmtChunk._blockAlign);
_source = (short *)(_sourceMap.Address + header->GetSize());
_samplePos = 0;
_looped = false;
_loopStart = 0;
_loopEnd = _numSamples;
smplLoop[] loops = header->_smplLoops;
if (loops.Length > 0)
{
_looped = true;
_loopStart = (int)loops[0]._dwStart;
_loopEnd = (int)loops[0]._dwEnd;
}
}
public static byte[] ToByteArray(IAudioStream source, int samplePosition = 0, int maxSampleCount = int.MaxValue, bool appendSmplChunk = false)
{
int sampleCount = Math.Min(maxSampleCount, (source.Samples - samplePosition));
//Estimate size
int outLen = 44 + (sampleCount * source.Channels * 2);
if (appendSmplChunk && source.IsLooping)
{
outLen += 68;
}
//Create byte array
byte[] wavData = new byte[outLen];
fixed(byte *address = wavData)
{
RIFFHeader *riff = (RIFFHeader *)address;
*riff = new RIFFHeader(1, source.Channels, 16, source.Frequency, sampleCount);
source.SamplePosition = samplePosition;
source.ReadSamples(address + 44, sampleCount);
if (appendSmplChunk && source.IsLooping)
{
riff->_length += 68;
smplChunk *smpl = (smplChunk *)(address + outLen - 68);
* smpl = new smplChunk
{
_chunkTag = smplChunk.smplTag,
_chunkSize = 60,
_dwManufacturer = 0,
_dwProduct = 0,
_dwSamplePeriod = 0,
_dwMIDIUnityNote = 0,
_dwMIDIPitchFraction = 0,
_dwSMPTEFormat = 0,
_dwSMPTEOffset = 0,
_cSampleLoops = 1,
_cbSamplerData = 0
};
smplLoop *loop = (smplLoop *)(address + outLen - 24);
* loop = new smplLoop
{
_dwIdentifier = 0,
_dwType = 0,
_dwStart = (uint)source.LoopStartSample,
_dwEnd = (uint)source.LoopEndSample,
_dwFraction = 0,
_dwPlayCount = 0
};
}
}
return(wavData);
}
internal PCMStream(FileMap map)
{
_sourceMap = map;
RIFFHeader *header = (RIFFHeader *)_sourceMap.Address;
_bps = header->_fmtChunk._bitsPerSample;
_numChannels = header->_fmtChunk._channels;
_frequency = (int)header->_fmtChunk._samplesSec;
_numSamples = (int)(header->_dataChunk._chunkSize / header->_fmtChunk._blockAlign);
_source = (short *)(_sourceMap.Address + header->GetSize());
_samplePos = 0;
}
public static void ToFile(IAudioStream source, string path)
{
using (FileStream stream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None, 8, FileOptions.SequentialScan))
{
//Estimate size
int outLen = 44 + (source.Samples * source.Channels * 2);
//Create file map
stream.SetLength(outLen);
using (FileMap map = FileMap.FromStreamInternal(stream, FileMapProtect.ReadWrite, 0, outLen))
{
RIFFHeader *riff = (RIFFHeader *)map.Address;
* riff = new RIFFHeader(1, source.Channels, 16, source.Frequency, source.Samples);
source.SamplePosition = 0;
source.ReadSamples(map.Address + 44, source.Samples);
}
}
}
internal PCMStream(FileMap map)
{
_sourceMap = map;
RIFFHeader *header = (RIFFHeader *)_sourceMap.Address;
//May be more subchunks between RIFF and data, so search for data.
dataChunk realDataChunk = new dataChunk();
VoidPtr dataPtr = 0;
for (int i = 0; i < _sourceMap.Length; i++)
{
byte *dat = (byte *)_sourceMap.Address.address;
dat += i;
if (i == 0xa6)
{
i = 0xa6;
}
if (*dat == 'd')
{
if (*(++dat) == 'a' && *(++dat) == 't' && *(++dat) == 'a')
{
realDataChunk._chunkTag = *( uint * )dat - 3;
realDataChunk._chunkSize = *( uint * )(dat + 1);
dataPtr = dat + 5;
break;
}
}
}
_bps = header->_fmtChunk._bitsPerSample;
_numChannels = header->_fmtChunk._channels;
_frequency = (int)header->_fmtChunk._samplesSec;
_numSamples = (int)(realDataChunk._chunkSize / header->_fmtChunk._blockAlign);
_source = ( short * )(dataPtr);
_samplePos = 0;
}
