void fxCompressor::process(float *inputs, long frames) {
double attack_coeff = exp(-1000.0 / (getParameter(fxCompressor_PRM_ATTACK) *
getParameter(fxCompressor_PRM_SAMPLE_RATE)));
double release_coeff = exp(-1000.0 / (getParameter(fxCompressor_PRM_RELEASE) *
getParameter(fxCompressor_PRM_SAMPLE_RATE)));
double keydb;
double overdb;
double gain;
float t = getParameter(fxCompressor_PRM_THRESH);
float r = getParameter(fxCompressor_PRM_RATIO);
while(--frames >= 0) {
keydb = lin2dB(fabs(*inputs) + DEF_DC_OFFSET);
overdb = keydb - t;
if(overdb < 0.0) {
overdb = 0.0;
}
overdb += DEF_DC_OFFSET;
if(m_envdb > overdb) {
m_envdb = overdb + attack_coeff * (m_envdb - overdb);
}
else {
m_envdb = overdb + release_coeff * (m_envdb - overdb);
}
// This is subtracted again to avoid denormalization after adding it
overdb = m_envdb - DEF_DC_OFFSET;
gain = overdb * (r - 1.0);
gain = dB2lin(gain);
*inputs++ *= gain;
}
}
void Compressor::process(float input, float&output)
{
float levelEstimate,gain;
levelEstimator.process(input, levelEstimate);
float logLevel = dB(levelEstimate);
if (logLevel < logThreshold)
{
output = input;
}
else
{
float dbGain = (logLevel - logThreshold) / (1/ratio -1);
output = input * dB2lin(dbGain);
}
}
void audio::algo::chunkware::Limiter::setThreshold(double _dB) {
m_thresholddB = _dB;
m_threshold = dB2lin(_dB);
}
//-------------------------------------------------------------
void SimpleGate::setThresh( double dB )
{
threshdB_ = dB;
thresh_ = dB2lin( dB );
}
//-------------------------------------------------------------
void SimpleLimit::setThresh( float dB )
{
threshdB_ = dB;
thresh_ = dB2lin( dB );
}
