void AudioNode::processReplacing(const SamplesBuffer &in, SamplesBuffer &out, int sampleRate, std::vector<midi::MidiMessage> &midiBuffer)
{
Q_UNUSED(in);
if (!isActivated())
return;
internalInputBuffer.setFrameLenght(out.getFrameLenght());
internalOutputBuffer.setFrameLenght(out.getFrameLenght());
{
QMutexLocker locker(&mutex);
for (auto node : connections) { // ask connected nodes to generate audio
node->processReplacing(internalInputBuffer, internalOutputBuffer, sampleRate, midiBuffer);
}
}
internalOutputBuffer.set(internalInputBuffer); // if we have no plugins inserted the input samples are just copied to output buffer.
static SamplesBuffer tempInputBuffer(2);
// process inserted plugins
for (int i=0; i < MAX_PROCESSORS_PER_TRACK; ++i) {
auto processor = processors[i];
if (processor && !processor->isBypassed()) {
tempInputBuffer.setFrameLenght(internalOutputBuffer.getFrameLenght());
tempInputBuffer.set(internalOutputBuffer); // the output from previous plugin is used as input to the next plugin in the chain
processor->process(tempInputBuffer, internalOutputBuffer, midiBuffer);
// some plugins are blocking the midi messages. If a VSTi can't generate messages the previous messages list will be sended for the next plugin in the chain. The messages list is cleared only when the plugin can generate midi messages.
if (processor->isVirtualInstrument() && processor->canGenerateMidiMessages())
midiBuffer.clear(); // only the fresh messages will be passed by the next plugin in the chain
auto pulledMessages = pullMidiMessagesGeneratedByPlugins();
midiBuffer.insert(midiBuffer.end(), pulledMessages.begin(), pulledMessages.end());
}
}
preFaderProcess(internalOutputBuffer); //call overrided preFaderProcess in subclasses to allow some preFader process.
internalOutputBuffer.applyGain(gain, leftGain, rightGain, boost);
lastPeak.update(internalOutputBuffer.computePeak());
postFaderProcess(internalOutputBuffer);
out.add(internalOutputBuffer);
}
