Envelope::Envelope()
: sampleRate(44100), gain(0), state(OFF), releaseSeconds(0)
, attackSeconds(0), decaySeconds(0)
, sustain_dB(MIN_GAIN_DB), minGain_dB(MIN_GAIN_DB)
{
sustainGain = minGain = dB2gain(MIN_GAIN_DB);
setReleaseSeconds(0.5);
setAttackSeconds(1);
}
EffectProcessor::EffectProcessor()
: AudioProcessor()
, gain(0)
, gainChange(0)
, state(OFF)
, height(0)
, width(0)
, ratio(0)
{
minGain = dB2gain(MIN_GAIN_DB);
}
void Envelope::setState(State state){
this->state = state;
// avoid division by zero
if (state == ATTACK && attackSeconds == 0){
setState(DECAY);
qDebug() << attackSeconds;
}
else if (state == DECAY && decaySeconds == 0){
setState(SUSTAIN);
}
else if (state == RELEASE && releaseSeconds == 0){
setState(OFF);
}
else {
if (state == OFF){
gain = 0;
qDebug() << "OFF";
}
if (state == ATTACK){
float gainChange_dB = fabs(MIN_GAIN_DB) / (attackSeconds * sampleRate);
gainChange = dB2gain(gainChange_dB);
gain = minGain;
}
if (state == DECAY){
gain = 1;
float gainChange_dB = fabs(sustain_dB) / (decaySeconds * sampleRate);
gainChange = 1/dB2gain(gainChange_dB);
}
if (state == RELEASE){
float gainChange_dB = fabs(sustain_dB - MIN_GAIN_DB)/(sampleRate * releaseSeconds);
gainChange = 1/dB2gain(gainChange_dB);
}
if (state == SUSTAIN){
gain = sustainGain;
gainChange = 1;
qDebug() << "SUSTAIN";
}
}
}
void Envelope::setSustain_dB(float sustain_dB){
this->sustainGain = dB2gain(sustain_dB);
this->sustain_dB = sustain_dB;
}
