Method processSamples

lib-src/soundtouch/source/SoundTouch/RateTransposer.cpp:279–306

Transposes sample rate by applying anti-alias filter to prevent folding. Returns amount of samples returned in the "dest" buffer. The maximum amount of samples that can be returned at a time is set by the 'set_returnBuffer_size' function.

// The maximum amount of samples that can be returned at a time is set by
// the 'set_returnBuffer_size' function.
void RateTransposer::processSamples(const SAMPLETYPE *src, uint nSamples)
{
    uint count;
    uint sizeReq;

    if (nSamples == 0) return;
    assert(pAAFilter);

    // If anti-alias filter is turned off, simply transpose without applying
    // the filter
    if (bUseAAFilter == FALSE) 
    {
        sizeReq = (uint)((float)nSamples / fRate + 1.0f);
        count = transpose(outputBuffer.ptrEnd(sizeReq), src, nSamples);
        outputBuffer.putSamples(count);
        return;
    }

    // Transpose with anti-alias filter
    if (fRate < 1.0f) 
    {
        upsample(src, nSamples);
    } 
    else  
    {
        downsample(src, nSamples);
    }
}


// Transposes the sample rate of the given samples using linear interpolation.