internal byte[] ConvertSamples(byte[] pvInSamples)
{
short[] data = null;
short[] array = AudioFormatConverter.Convert(pvInSamples, _iInFormatType, AudioCodec.PCM16);
if (_inWavFormat.nChannels == 2 && _outWavFormat.nChannels == 1)
{
data = Resample(_inWavFormat, _outWavFormat, Stereo2Mono(array), _leftMemory);
}
else if (_inWavFormat.nChannels == 1 && _outWavFormat.nChannels == 2)
{
data = Mono2Stereo(Resample(_inWavFormat, _outWavFormat, array, _leftMemory));
}
if (_inWavFormat.nChannels == 2 && _outWavFormat.nChannels == 2)
{
if (_inWavFormat.nSamplesPerSec != _outWavFormat.nSamplesPerSec)
{
short[] leftSamples;
short[] rightSamples;
SplitStereo(array, out leftSamples, out rightSamples);
data = MergeStereo(Resample(_inWavFormat, _outWavFormat, leftSamples, _leftMemory), Resample(_inWavFormat, _outWavFormat, rightSamples, _rightMemory));
}
else
{
data = array;
}
}
if (_inWavFormat.nChannels == 1 && _outWavFormat.nChannels == 1)
{
data = Resample(_inWavFormat, _outWavFormat, array, _leftMemory);
}
_eChunkStatus = Block.Middle;
return(AudioFormatConverter.Convert(data, AudioCodec.PCM16, _iOutFormatType));
}
internal bool PrepareConverter(ref WAVEFORMATEX inWavFormat, ref WAVEFORMATEX outWavFormat)
{
bool result = true;
if (inWavFormat.nSamplesPerSec <= 0 || inWavFormat.nChannels > 2 || inWavFormat.nChannels <= 0 || outWavFormat.nChannels <= 0 || outWavFormat.nSamplesPerSec <= 0 || outWavFormat.nChannels > 2)
{
throw new FormatException();
}
_iInFormatType = AudioFormatConverter.TypeOf(inWavFormat);
_iOutFormatType = AudioFormatConverter.TypeOf(outWavFormat);
if (_iInFormatType < AudioCodec.G711U || _iOutFormatType < AudioCodec.G711U)
{
throw new FormatException();
}
if (outWavFormat.nSamplesPerSec == inWavFormat.nSamplesPerSec && _iOutFormatType == _iInFormatType && outWavFormat.nChannels == inWavFormat.nChannels)
{
result = false;
}
else
{
if (inWavFormat.nSamplesPerSec != outWavFormat.nSamplesPerSec)
{
CreateResamplingFilter(inWavFormat.nSamplesPerSec, outWavFormat.nSamplesPerSec);
}
_inWavFormat = inWavFormat;
_outWavFormat = outWavFormat;
}
return(result);
}
