Method processBlock

Source/DSP/GranularSynth.cpp:182–306

#endif

void GranularSynth::processBlock(juce::AudioBuffer<float>& buffer, juce::MidiBuffer& midiMessages) {
  juce::ScopedNoDenormals noDenormals;
  auto totalNumInputChannels = getTotalNumInputChannels();
  auto totalNumOutputChannels = getTotalNumOutputChannels();
  const int bufferNumSample = buffer.getNumSamples();

  // Update mod source values once per block
  mParameters.processModSources();

  mKeyboardState.processNextMidiBuffer(midiMessages, 0, bufferNumSample, true);
  for (const auto& messageMeta : midiMessages) {
    juce::MidiMessage msg = messageMeta.getMessage();
    if (msg.isController() && msg.getControllerNumber() == 1) {
      // Update macro 1 based on mod wheel input
      ParamHelper::setParam(mParameters.global.macros[0].macro, msg.getControllerValue() / 127.0f);
    } else if (msg.isPitchWheel()) {
      // Update local pitch bend value
      mCurPitchBendSemitones = ((msg.getPitchWheelValue() / 8192.0f) - 1.0f) * MAX_PITCH_BEND_SEMITONES;
    }
  }

  // In case we have more outputs than inputs, this code clears any output
  // channels that didn't contain input data, (because these aren't
  // guaranteed to be empty - they may contain garbage).
  // This is here to avoid people getting screaming feedback
  // when they first compile a plugin, but obviously you don't need to keep
  // this code if your algorithm always overwrites all the output channels.
  for (auto i = totalNumInputChannels; i < totalNumOutputChannels; ++i) {
    buffer.clear(i, 0, bufferNumSample);
  }

  // Reference tone
  mReferenceTone.getNextAudioBlock(juce::AudioSourceChannelInfo(&buffer, 0, buffer.getNumSamples()));

  // Playback from trim selection panel
  if (mParameters.ui.playingTrimSelection) {
    int numPlaybackSamples = bufferNumSample;
    if (mParameters.ui.trimPlaybackSample + bufferNumSample >= mInputBuffer.getNumSamples()) {
      // Done playing, reset status
      mParameters.ui.playingTrimSelection = false;
    } else {
      // if output buffer is stereo and the input in mono, duplicate into both channels
      // if output buffer is mono and the input in stereo, just play one channel for simplicity
      for (int ch = 0; ch < buffer.getNumChannels(); ++ch) {
        const int inputChannel = juce::jmin(ch, mInputBuffer.getNumChannels() - 1);
        buffer.copyFrom(ch, 0, mInputBuffer, inputChannel, mParameters.ui.trimPlaybackSample, numPlaybackSamples);
      }
      mParameters.ui.trimPlaybackSample += numPlaybackSamples;
    }
  }

  // Add contributions from each note
  auto bufferChannels = buffer.getArrayOfWritePointers();
  for (int i = 0; i < bufferNumSample; ++i) {
    // Don't use a for(auto x : mActiveNotes) loop here as mActiveNotes can be added outside this function. If it is partially added
    // it might to use it and the undefined data will cause a crash eventually
    const int activeNoteSize = mActiveNotes.size();
    for (int noteIndex = 0; noteIndex < activeNoteSize; noteIndex++) {