void WaveShaperDSPKernel::processCurve2x(const float* source, float* destination, size_t framesToProcess)
{
bool isSafe = framesToProcess == RenderingQuantum;
ASSERT(isSafe);
if (!isSafe)
return;
float* tempP = m_tempBuffer->data();
m_upSampler->process(source, tempP, framesToProcess);
// Process at 2x up-sampled rate.
processCurve(tempP, tempP, framesToProcess * 2);
m_downSampler->process(tempP, destination, framesToProcess * 2);
}
void WaveShaperDSPKernel::process(const float* source, float* destination, size_t framesToProcess)
{
switch (waveShaperProcessor()->oversample()) {
case WaveShaperProcessor::OverSampleNone:
processCurve(source, destination, framesToProcess);
break;
case WaveShaperProcessor::OverSample2x:
processCurve2x(source, destination, framesToProcess);
break;
case WaveShaperProcessor::OverSample4x:
processCurve4x(source, destination, framesToProcess);
break;
default:
ASSERT_NOT_REACHED();
}
}
void WaveShaperDSPKernel::processCurve4x(const float* source,
float* destination,
size_t framesToProcess) {
bool isSafe = framesToProcess == AudioUtilities::kRenderQuantumFrames;
DCHECK(isSafe);
if (!isSafe)
return;
float* tempP = m_tempBuffer->data();
float* tempP2 = m_tempBuffer2->data();
m_upSampler->process(source, tempP, framesToProcess);
m_upSampler2->process(tempP, tempP2, framesToProcess * 2);
// Process at 4x up-sampled rate.
processCurve(tempP2, tempP2, framesToProcess * 4);
m_downSampler2->process(tempP2, tempP, framesToProcess * 4);
m_downSampler->process(tempP, destination, framesToProcess * 2);
}