void BiquadDSPKernel::getFrequencyResponse(int nFrequencies,
const float* frequencyHz,
float* magResponse,
float* phaseResponse)
{
bool isGood = nFrequencies > 0 && frequencyHz && magResponse && phaseResponse;
ASSERT(isGood);
if (!isGood)
return;
std::vector<float> frequency(nFrequencies);
double nyquist = this->nyquist();
// Convert from frequency in Hz to normalized frequency (0 -> 1),
// with 1 equal to the Nyquist frequency.
for (int k = 0; k < nFrequencies; ++k)
frequency[k] = narrowPrecisionToFloat(frequencyHz[k] / nyquist);
// We want to get the final values of the coefficients and compute
// the response from that instead of some intermediate smoothed
// set. Forcefully update the coefficients even if they are not
// dirty.
updateCoefficientsIfNecessary(false, true);
m_biquad.getFrequencyResponse(nFrequencies, &frequency[0], magResponse, phaseResponse);
}
void BiquadDSPKernel::process(const float* source, float* destination, size_t framesToProcess)
{
ASSERT(source && destination && biquadProcessor());
// Recompute filter coefficients if any of the parameters have changed.
// FIXME: as an optimization, implement a way that a Biquad object can simply copy its internal filter coefficients from another Biquad object.
// Then re-factor this code to only run for the first BiquadDSPKernel of each BiquadProcessor.
updateCoefficientsIfNecessary(true, false);
m_biquad.process(source, destination, framesToProcess);
}
void BiquadDSPKernel::process(const float* source, float* destination, size_t framesToProcess)
{
ASSERT(source);
ASSERT(destination);
ASSERT(biquadProcessor());
// Recompute filter coefficients if any of the parameters have changed.
// FIXME: as an optimization, implement a way that a Biquad object can simply copy its internal filter coefficients from another Biquad object.
// Then re-factor this code to only run for the first BiquadDSPKernel of each BiquadProcessor.
// The audio thread can't block on this lock; skip updating the coefficients for this block if
// necessary. We'll get them the next time around.
{
MutexTryLocker tryLocker(m_processLock);
if (tryLocker.locked())
updateCoefficientsIfNecessary();
}
m_biquad.process(source, destination, framesToProcess);
}