public static PcmAudio ToPcmAudio(RiffWaveChunk waveChunk)
{
int half = 1 << waveChunk.formatChunk.SampleSize - 1;
int full = 1 << waveChunk.formatChunk.SampleSize;
IEnumerable <double>[] blocks = new IEnumerable <double> [waveChunk.dataChunk.Size / waveChunk.formatChunk.BlockSize];
for (int blockIndex = 0; blockIndex < blocks.Length; blockIndex++)
{
double[] samples = new double[waveChunk.formatChunk.ChannelCount];
for (int sampleIndex = 0; sampleIndex < samples.Length; sampleIndex++)
{
int sample = 0;
for (int part = 0; part < (waveChunk.formatChunk.SampleSize / 8); part++)
{
sample += waveChunk.dataChunk.Data[blockIndex * waveChunk.formatChunk.BlockSize + sampleIndex * (waveChunk.formatChunk.SampleSize / 8) + part] << part * 8;
}
if (sample >= half)
{
sample -= full;
}
samples[sampleIndex] = (double)sample / (double)half;
}
blocks[blockIndex] = samples;
}
return(PcmAudio.FromBlocks(blocks, (double)blocks.Length / (double)waveChunk.formatChunk.SampleRate));
}
public static RiffWaveChunk FromPcmAudio(PcmAudio pcmAudio)
{
IEnumerable <double>[] blocks = pcmAudio.Blocks.ToArray();
RiffFormatChunk formatChunk = new RiffFormatChunk((ushort)pcmAudio.Channels.Count(), (ushort)(blocks.Length / pcmAudio.Length), 16);
byte[] data = new byte[formatChunk.BlockSize * blocks.Length];
int position = 0;
for (int blockIndex = 0; blockIndex < blocks.Length; blockIndex++)
{
double[] samples = blocks[blockIndex].ToArray();
for (int sampleIndex = 0; sampleIndex < samples.Length; sampleIndex++)
{
if (samples[sampleIndex] < -1 || samples[sampleIndex] >= +1)
{
throw new InvalidDataException(string.Format("Sample at index {0} was out of range ({1}).", sampleIndex, samples[sampleIndex]));
}
foreach (byte part in BitConverter.GetBytes((short)(samples[sampleIndex] * 0x8000)))
{
data[position++] = part;
}
}
}
RiffDataChunk dataChunk = new RiffDataChunk(data);
return(new RiffWaveChunk(formatChunk, dataChunk));
}
