/// <summary>
/// Initializes a new instance of the
/// <see cref="BpmDetect<TSampleType, TLongSampleType>"/> class.
/// </summary>
/// <param name="numChannels">Number of channels in sample data.</param>
/// <param name="sampleRate">Sample rate in Hz.</param>
protected BpmDetect(int numChannels, int sampleRate)
{
_sampleRate = sampleRate;
Channels = numChannels;
DecimateSum = default(TLongSampleType);
DecimateCount = 0;
_envelopeAccu = 0;
// choose decimation factor so that result is approx. 1000 Hz
DecimateBy = sampleRate / 1000;
Debug.Assert(DecimateBy > 0);
Debug.Assert(INPUT_BLOCK_SAMPLES < DecimateBy * DECIMATED_BLOCK_SAMPLES);
// Calculate window length & starting item according to desired min & max bpms
WindowLen = (60 * sampleRate) / (DecimateBy * MIN_BPM);
WindowStart = (60 * sampleRate) / (DecimateBy * MAX_BPM);
Debug.Assert(WindowLen > WindowStart);
// allocate new working objects
Xcorr = new float[WindowLen];
// allocate processing buffer
Buffer = new FifoSampleBuffer <TSampleType>();
// we do processing in mono mode
Buffer.SetChannels(1);
Buffer.Clear();
}
/// <summary>Sets the number of channels, 1 = mono, 2 = stereo</summary>
public void SetChannels(int numChannels)
{
Debug.Assert(numChannels > 0);
if (_channels == numChannels)
{
return;
}
Debug.Assert(numChannels == 1 || numChannels == 2);
_channels = numChannels;
_inputBuffer.SetChannels(_channels);
_outputBuffer.SetChannels(_channels);
}
/// <summary>
/// Sets the number of channels, 1 = mono, 2 = stereo
/// </summary>
public void SetChannels(int channels)
{
Debug.Assert(channels > 0);
if (_transposer.channels == channels)
{
return;
}
_transposer.SetChannels(channels);
_inputBuffer.SetChannels(channels);
_midBuffer.SetChannels(channels);
_outputBuffer.SetChannels(channels);
}
/// <summary>Sets the number of channels, 1 = mono, 2 = stereo</summary>
public void SetChannels(int numChannels)
{
Debug.Assert(numChannels > 0);
if (_channels == numChannels)
{
return;
}
// Debug.Assert(numChannels == 1 || numChannels == 2);
_channels = numChannels;
_inputBuffer.SetChannels(_channels);
_outputBuffer.SetChannels(_channels);
// re-init overlap/buffer
_overlapLength = 0;
SetParameters(_sampleRate);
}
/// <summary>
/// Sets the number of channels, 1 = mono, 2 = stereo
/// </summary>
public void SetChannels(int channels)
{
Debug.Assert(channels > 0);
if (_channels == channels)
{
return;
}
Debug.Assert((channels == 1) || (channels == 2));
_channels = channels;
_storeBuffer.SetChannels(_channels);
_tempBuffer.SetChannels(_channels);
_outputBuffer.SetChannels(_channels);
// Inits the linear interpolation registers
ResetRegisters();
}
