private static void OpenFiles(out WavInFile inFile, out WavOutFile outFile, RunParameters parameters)
{
inFile = parameters.InFileName == "stdin" ? new WavInFile(Console.OpenStandardInput()) : new WavInFile(parameters.InFileName);
// ... open output file with same sound parameters
int bits = (inFile).GetNumBits();
int samplerate = (inFile).GetSampleRate();
int channels = (inFile).GetNumChannels();
if (parameters.OutFileName != null)
{
outFile = parameters.OutFileName == "stdout" ? new WavOutFile(Console.OpenStandardOutput(), samplerate, bits, channels) : new WavOutFile(parameters.OutFileName, samplerate, bits, channels);
}
else
{
outFile = null;
}
}
/// <summary>
/// Processes the sound.
/// </summary>
private static void Process(SoundTouch <TSampleType, TLongSampleType> pSoundTouch, WavInFile inFile, WavOutFile outFile)
{
int nSamples;
var sampleBuffer = new TSampleType[BUFF_SIZE];
if ((inFile == null) || (outFile == null))
{
return; // nothing to do.
}
int nChannels = inFile.GetNumChannels();
Debug.Assert(nChannels > 0);
int buffSizeSamples = BUFF_SIZE / nChannels;
// Process samples read from the input file
while (!inFile.Eof())
{
// Read a chunk of samples from the input file
int num = inFile.Read(sampleBuffer, BUFF_SIZE);
nSamples = num / inFile.GetNumChannels();
// Feed the samples into SoundTouch processor
pSoundTouch.PutSamples(sampleBuffer, nSamples);
// Read ready samples from SoundTouch processor & write them output file.
// NOTES:
// - 'receiveSamples' doesn't necessarily return any samples at all
// during some rounds!
// - On the other hand, during some round 'receiveSamples' may have more
// ready samples than would fit into 'sampleBuffer', and for this reason
// the 'receiveSamples' call is iterated for as many times as it
// outputs samples.
do
{
nSamples = pSoundTouch.ReceiveSamples(sampleBuffer, buffSizeSamples);
outFile.Write(sampleBuffer, nSamples * nChannels);
} while (nSamples != 0);
}
// Now the input file is processed, yet 'flush' few last samples that are
// hiding in the SoundTouch's internal processing pipeline.
pSoundTouch.Flush();
do
{
nSamples = pSoundTouch.ReceiveSamples(sampleBuffer, buffSizeSamples);
outFile.Write(sampleBuffer, nSamples * nChannels);
} while (nSamples != 0);
}
