Method inputSamples

lib-src/soundtouch/source/SoundTouch/BPMDetect.cpp:289–324

void BPMDetect::inputSamples(const SAMPLETYPE *samples, int numSamples)
{
    SAMPLETYPE decimated[DECIMATED_BLOCK_SAMPLES];

    // iterate so that max INPUT_BLOCK_SAMPLES processed per iteration
    while (numSamples > 0)
    {
        int block;
        int decSamples;

        block = (numSamples > INPUT_BLOCK_SAMPLES) ? INPUT_BLOCK_SAMPLES : numSamples;

        // decimate. note that converts to mono at the same time
        decSamples = decimate(decimated, samples, block);
        samples += block * channels;
        numSamples -= block;

        // envelope new samples and add them to buffer
        calcEnvelope(decimated, decSamples);
        buffer->putSamples(decimated, decSamples);
    }

    // when the buffer has enought samples for processing...
    if ((int)buffer->numSamples() > windowLen) 
    {
        int processLength;

        // how many samples are processed
        processLength = (int)buffer->numSamples() - windowLen;

        // ... calculate autocorrelations for oldest samples...
        updateXCorr(processLength);
        // ... and remove them from the buffer
        buffer->receiveSamples(processLength);
    }
}