Method Process

Source/KarplusStrongVoice.cpp:63–188

}

bool KarplusStrongVoice::Process(double time, ChannelBuffer* out, int oversampling)
{
   PROFILER(KarplusStrongVoice);

   if (IsDone(time))
      return false;

   int bufferSize = out->BufferSize();
   int channels = out->NumActiveChannels();
   double sampleIncrementMs = gInvSampleRateMs;
   double sampleRate = gSampleRate;
   ChannelBuffer* destBuffer = out;

   if (oversampling != 1)
   {
      gMidiVoiceWorkChannelBuffer.SetNumActiveChannels(channels);
      destBuffer = &gMidiVoiceWorkChannelBuffer;
      gMidiVoiceWorkChannelBuffer.Clear();
      bufferSize *= oversampling;
      sampleIncrementMs /= oversampling;
      sampleRate *= oversampling;
   }

   float freq;
   float filterRate;
   float filterLerp;
   float pitch;
   float oscPhaseInc;

   if (mVoiceParams->mLiteCPUMode)
      DoParameterUpdate(0, oversampling, pitch, freq, filterRate, filterLerp, oscPhaseInc);

   for (int pos = 0; pos < bufferSize; ++pos)
   {
      if (!mVoiceParams->mLiteCPUMode)
         DoParameterUpdate(pos / oversampling, oversampling, pitch, freq, filterRate, filterLerp, oscPhaseInc);

      if (mVoiceParams->mSourceType == kSourceTypeSaw)
         mOsc.SetType(kOsc_Saw);
      else
         mOsc.SetType(kOsc_Sin);
      mOscPhase += oscPhaseInc;
      float sample = 0;
      float oscSample = mOsc.Audio(time, mOscPhase);
      float noiseSample = RandomSample();
      float pitchBlend = ofClamp((pitch - 40) / 60.0f, 0, 1);
      pitchBlend *= pitchBlend;
      if (mVoiceParams->mSourceType == kSourceTypeSin || mVoiceParams->mSourceType == kSourceTypeSaw)
         sample = oscSample;
      else if (mVoiceParams->mSourceType == kSourceTypeNoise)
         sample = noiseSample;
      else if (mVoiceParams->mSourceType == kSourceTypeMix)
         sample = noiseSample * pitchBlend + oscSample * (1 - pitchBlend);
      else if (mVoiceParams->mSourceType == kSourceTypeInput || mVoiceParams->mSourceType == kSourceTypeInputNoEnvelope)
         sample = mKarplusStrongModule->GetBuffer()->GetChannel(0)[pos / oversampling];

      if (mVoiceParams->mSourceType != kSourceTypeInputNoEnvelope)
         sample *= mEnv.Value(time) + mVoiceParams->mExcitation;