/// <summary>
/// Detect BPM rate of <paramref name="inFile"/> and adjust tempo
/// setting accordingly if necessary.
/// </summary>
private static void DetectBpm(WavInFile inFile, RunParameters parameters)
{
var bpm = BpmDetect <TSampleType, TLongSampleType> .NewInstance(inFile.GetNumChannels(), inFile.GetSampleRate());
var sampleBuffer = new TSampleType[BUFF_SIZE];
// detect bpm rate
Console.Error.Write("Detecting BPM rate...");
Console.Error.Flush();
int nChannels = inFile.GetNumChannels();
Debug.Assert(BUFF_SIZE % nChannels == 0);
// Process the 'inFile' in small blocks, repeat until whole file has
// been processed
while (inFile.Eof() == false)
{
// Read sample data from input file
int num = inFile.Read(sampleBuffer, BUFF_SIZE);
// Enter the new samples to the bpm analyzer class
int samples = num / nChannels;
bpm.InputSamples(sampleBuffer, samples);
}
// Now the whole song data has been analyzed. Read the resulting bpm.
float bpmValue = bpm.GetBpm();
Console.Error.WriteLine("Done!");
// rewind the file after bpm detection
inFile.Rewind();
if (bpmValue > 0)
{
Console.Error.WriteLine("Detected BPM rate {0:0.0}\n", bpmValue);
}
else
{
Console.Error.WriteLine("Couldn't detect BPM rate.\n");
return;
}
if (parameters.GoalBpm > 0)
{
// adjust tempo to given bpm
parameters.TempoDelta = (parameters.GoalBpm / bpmValue - 1.0f) * 100.0f;
Console.Error.WriteLine("The file will be converted to {0:0.0} BPM\n", parameters.GoalBpm);
}
}
/// <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);
}
/// <summary>
/// Sets the <c>SoundTouch</c> object up according to input file sound format & command line parameters
/// </summary>
private static void Setup(SoundTouch <TSampleType, TLongSampleType> pSoundTouch, WavInFile inFile, RunParameters parameters)
{
int sampleRate = inFile.GetSampleRate();
int channels = inFile.GetNumChannels();
pSoundTouch.SetSampleRate(sampleRate);
pSoundTouch.SetChannels(channels);
pSoundTouch.SetTempoChange(parameters.TempoDelta);
pSoundTouch.SetPitchSemiTones(parameters.PitchDelta);
pSoundTouch.SetRateChange(parameters.RateDelta);
pSoundTouch.SetSetting(SettingId.UseQuickseek, parameters.Quick);
pSoundTouch.SetSetting(SettingId.UseAntiAliasFilter, (parameters.NoAntiAlias == 1) ? 0 : 1);
if (parameters.Speech)
{
// use settings for speech processing
pSoundTouch.SetSetting(SettingId.SequenceDurationMs, 40);
pSoundTouch.SetSetting(SettingId.SeekwindowDurationMs, 15);
pSoundTouch.SetSetting(SettingId.OverlapDurationMs, 8);
Console.Error.WriteLine("Tune processing parameters for speech processing.");
}
// print processing information
if (parameters.OutFileName != null)
{
#if SOUNDTOUCH_INTEGER_SAMPLES
Console.Error.WriteLine("Uses 16bit integer sample type in processing.\n");
#else
#if !SOUNDTOUCH_FLOAT_SAMPLES
#error "Sampletype not defined"
#endif
Console.Error.WriteLine("Uses 32bit floating point sample type in processing.\n");
#endif
// print processing information only if outFileName given i.e. some processing will happen
Console.Error.WriteLine("Processing the file with the following changes:");
Console.Error.WriteLine(" tempo change = {0:0.00} %", parameters.TempoDelta);
Console.Error.WriteLine(" pitch change = {0} semitones", parameters.PitchDelta);
Console.Error.WriteLine(" rate change = {0:0.00} %\n", parameters.RateDelta);
Console.Error.Write("Working...");
}
else
{
// outFileName not given
Console.Error.WriteLine("Warning: output file name missing, won't output anything.\n");
}
Console.Error.Flush();
}
//private static int Main(string[] args)
//{
// var parameters = new RunParameters();
// parameters.TempoDelta = 50;
// parameters.PitchDelta = 5;
// parameters.Speech = true;
// var inBytes = System.IO.File.ReadAllBytes("Test.wav");
// var inStream = new MemoryStream(inBytes);
// var outStream = new MemoryStream();
// Process(inStream, outStream, parameters);
// var outBytes = outStream.ToArray();
// File.WriteAllBytes("Test_Pith_Tempo_ms.wav", outBytes);
// return 0;
//}
public static void Process(Stream inStream, Stream outStream, RunParameters parameters)
{
var soundTouch = new SoundTouch <TSampleType, TLongSampleType>();
// Open Input file.
var inFile = new WavInFile(inStream);
//var inFile = new WavInFile("Test.wav");
int bits = inFile.GetNumBits();
int samplerate = inFile.GetSampleRate();
int channels = inFile.GetNumChannels();
// Open output file.
var outFile = new WavOutFile(outStream, samplerate, bits, channels);
//var outFile = new WavOutFile("Test_Pith_Tempo.wav", samplerate, bits, channels);
if (parameters.DetectBpm)
{
// detect sound BPM (and adjust processing parameters
// accordingly if necessary)
DetectBpm(inFile, parameters);
}
// Setup the 'SoundTouch' object for processing the sound
int sampleRate = inFile.GetSampleRate();
soundTouch.SetSampleRate(sampleRate);
soundTouch.SetChannels(channels);
soundTouch.SetTempoChange(parameters.TempoDelta);
soundTouch.SetPitchSemiTones(parameters.PitchDelta);
soundTouch.SetRateChange(parameters.RateDelta);
soundTouch.SetSetting(SettingId.UseQuickseek, parameters.Quick);
soundTouch.SetSetting(SettingId.UseAntiAliasFilter, (parameters.NoAntiAlias == 1) ? 0 : 1);
if (parameters.Speech)
{
// use settings for speech processing
soundTouch.SetSetting(SettingId.SequenceDurationMs, 40);
soundTouch.SetSetting(SettingId.SeekwindowDurationMs, 15);
soundTouch.SetSetting(SettingId.OverlapDurationMs, 8);
}
// Process the sound
Process(soundTouch, inFile, outFile);
if (inFile != null)
{
inFile.Dispose();
}
if (outFile != null)
{
outFile.Dispose();
}
}