private static byte[] ConvertRawPCMFile(int outputSampleRate, int outputChannels, byte[] pcmSamples, PcmSample pcmSampleSize, int pcmSampleRate, int pcmChannels)
{
int numPcmSamples = (pcmSamples.Length / (int)pcmSampleSize / pcmChannels);
float pcmDuraton = numPcmSamples / (float)pcmSampleRate;
int numOutputSamples = (int)(pcmDuraton * outputSampleRate);
//Ensure that samble buffer is aligned to write chunk size
numOutputSamples = (numOutputSamples / WriteBufferSize) * WriteBufferSize;
float[][] outSamples = new float[outputChannels][];
for (int ch = 0; ch < outputChannels; ch++)
{
outSamples[ch] = new float[numOutputSamples];
}
for (int sampleNumber = 0; sampleNumber < numOutputSamples; sampleNumber++)
{
float rawSample = 0.0f;
for (int ch = 0; ch < outputChannels; ch++)
{
int sampleIndex = (sampleNumber * pcmChannels) * (int)pcmSampleSize;
if (ch < pcmChannels)
{
sampleIndex += (ch * (int)pcmSampleSize);
}
switch (pcmSampleSize)
{
case PcmSample.EightBit:
rawSample = ByteToSample(pcmSamples[sampleIndex]);
break;
case PcmSample.SixteenBit:
rawSample = ShortToSample((short)(pcmSamples[sampleIndex + 1] << 8 | pcmSamples[sampleIndex]));
break;
}
outSamples[ch][sampleNumber] = rawSample;
}
}
return(GenerateFile(outSamples, outputSampleRate, outputChannels));
}
private static void ConvertPCMToOggVorbis(Stream inputStream, Stream outputStream, int outputSampleRate, int outputChannels, PcmSample pcmSampleSize, int pcmSampleRate, int pcmChannels)
{
byte[] pcm = new byte[WriteBufferSize];
InitOggStream(outputSampleRate, outputChannels, out OggStream oggStream, out ProcessingState processingState);
while (true)
{
int chunkSize = inputStream.Read(pcm, 0, WriteBufferSize);
if (chunkSize <= 0)
{
break;
}
int numPcmSamples = chunkSize / (int)pcmSampleSize / pcmChannels;
float pcmDuraton = numPcmSamples / (float)pcmSampleRate;
int numOutputSamples = (int)(pcmDuraton * outputSampleRate);
float[][] outSamples = new float[outputChannels][];
for (int ch = 0; ch < outputChannels; ch++)
{
outSamples[ch] = new float[numOutputSamples];
}
for (int sampleNumber = 0; sampleNumber < numOutputSamples; sampleNumber++)
{
float rawSample = 0.0f;
for (int ch = 0; ch < outputChannels; ch++)
{
int sampleIndex = (sampleNumber * pcmChannels) * (int)pcmSampleSize;
if (ch < pcmChannels)
{
sampleIndex += ch * (int)pcmSampleSize;
}
switch (pcmSampleSize)
{
case PcmSample.EightBit:
rawSample = ByteToSample(pcm[sampleIndex]);
break;
default:
case PcmSample.SixteenBit:
rawSample = ShortToSample((short)(pcm[sampleIndex + 1] << 8 | pcm[sampleIndex]));
break;
}
outSamples[ch][sampleNumber] = rawSample;
}
}
FlushPages(oggStream, outputStream, false);
ProcessChunk(outSamples, processingState, oggStream, numOutputSamples);
}
FlushPages(oggStream, outputStream, true);
}
