bool handlePluginRequest(const PluginRequestParameters ¶ms, OutputStream &ostream,
ThreadSafePlugin *plugin = nullptr) {
if (!plugin) {
// It's very possible that all of this was a premature optimization.
// For VSTs at least, code loading and caching is handled by ModuleHandle::findOrCreateModule,
// and each instantiation only requires a couple of disc hits for working directory setting.
// On the other hand, we want to make sure that each audio request has a "fresh" instance.
// The easiest way to do this is by bypassing the instance pool and instantiating on demand.
#if PLUGIN_POOL_SIZE
// Recurse with a plugin from the pool, locking on it.
// Keep trying with a delay until a timeout occurs.
const int TIMEOUT = 5000, WAIT = 200;
int64 startTime = Time::currentTimeMillis();
while (Time::currentTimeMillis() < startTime + TIMEOUT) {
int i = 0;
while ((plugin = pluginPool[i++])) {
const ScopedTryLock pluginTryLock(plugin->crit);
if (pluginTryLock.isLocked()) {
DBG << "Handling with plugin " << i << endl;
return handlePluginRequest(params, ostream, plugin);
}
}
DBG << "Trying again in " << WAIT << endl;
Thread::sleep(WAIT);
}
// If we were unable to obtain a lock, return failure.
DBG << "Timeout" << endl;
return false;
#else
ThreadSafePlugin temporaryPlugin(createSynthInstance());
return handlePluginRequest(params, ostream, &temporaryPlugin);
#endif
}
else {
// Re-acquire or acquire the lock.
const ScopedLock pluginLock(plugin->crit);
AudioPluginInstance *instance = plugin->instance; // unmanaged, for simplicity
// Attempt to reset the plugin in all ways possible.
instance->reset();
// Setting default parameters here causes miniTERA to become unresponsive to parameter settings.
// It's possible that it's effectively pressing some interface buttons that change the editor mode entirely.
// It's not necessary anyways if the plugin instance has been freshly created (see above).
// pluginParametersOldNewFallback(instance, nullptr, &pluginDefaults); // note that the defaults may be empty
instance->setCurrentProgram(0);
// Load preset if specified, before listing or modifying parameters!
if (params.presetNumber >= 0 && params.presetNumber < instance->getNumPrograms()) {
DBG << "Setting program/preset: " << params.presetNumber << endl;
instance->setCurrentProgram(params.presetNumber);
}
int currentProgram = instance->getCurrentProgram();
DBG << "Current program/preset: " << currentProgram << " - " << instance->getProgramName(currentProgram) << endl;
// Set parameters, starting with named, then indexed
pluginParametersSet(instance, params.parameters);
pluginParametersSetIndexed(instance, params.indexedParameters);
// If parameters requested, output them and return
if (params.listParameters) {
DBG << "Rendering parameter list: # parameters " << instance->getNumPrograms() << endl;
// Output each parameter setting in two places:
// an indexed array and a dictionary by name
// All DynamicObjects created will be freed when their var's leave scope.
DynamicObject *outer = new DynamicObject();
DynamicObject *innerParams = new DynamicObject();
var indexedParamVar;
{
for (int i = 0, n = instance->getNumParameters(); i < n; ++i) {
String name = instance->getParameterName(i);
float val = instance->getParameter(i);
innerParams->setProperty(name, val);
DynamicObject *indexedInnerObj = new DynamicObject();
indexedInnerObj->setProperty("index", i);
indexedInnerObj->setProperty("name", name);
indexedInnerObj->setProperty("value", val);
indexedParamVar.append(var(indexedInnerObj)); // frees indexedInnerObj when this scope ends
}
}
outer->setProperty(Identifier("parameters"), var(innerParams));
outer->setProperty(Identifier("indexedParameters"), indexedParamVar);
// List presets/programs.
var progVar;
{
for (int i = 0, n = instance->getNumPrograms(); i < n; ++i) {
progVar.append(var(instance->getProgramName(i)));
}
}
outer->setProperty(Identifier("presets"), progVar);
var outerVar(outer);
JSON::writeToStream(ostream, outerVar);
// DBG << JSON::toString(outerVar, true /* allOnOneLine */) << endl;
return true;
}
// Now attempt to render audio.
AudioFormatManager formatManager;
formatManager.registerBasicFormats();
OptionalScopedPointer<AudioFormat> outputFormat(formatManager.findFormatForFileExtension(params.getFormatName()), false);
if (!outputFormat) return false;
instance->setNonRealtime(true);
instance->prepareToPlay(params.sampleRate, params.blockSize);
instance->setNonRealtime(true);
// The writer takes ownership of the output stream; the writer will delete it when the writer leaves scope.
// Therefore, we pass a special pointer class that does not allow the writer to delete it.
OutputStream *ostreamNonDeleting = new NonDeletingOutputStream(&ostream);
ScopedPointer<AudioFormatWriter> writer(outputFormat->createWriterFor(ostreamNonDeleting,
params.sampleRate, params.nChannels, params.bitDepth,
StringPairArray(), 0));
// Create a MIDI buffer
MidiBuffer midiBuffer;
midiBuffer.addEvent(MidiMessage::noteOn(params.midiChannel, (uint8)params.midiPitch, (uint8)params.midiVelocity),
0 /* time */);
midiBuffer.addEvent(MidiMessage::allNotesOff(params.midiChannel),
params.noteSeconds * params.sampleRate);
AudioSampleBuffer buffer(params.nChannels, params.blockSize);
int numBuffers = (int)(params.renderSeconds * params.sampleRate / params.blockSize);
for (int i = 0; i < numBuffers; ++i) {
// DBG << "Processing block " << i << "..." << flush;
instance->processBlock(buffer, midiBuffer);
// DBG << " left RMS level " << buffer.getRMSLevel(0, 0, params.blockSize) << endl;
writer->writeFromAudioSampleBuffer(buffer, 0 /* offset into buffer */, params.blockSize);
}
instance->reset();
return true;
}
}
