C++ AudioPluginInstance::getCurrentProgram方法代码示例

static int get_current_preset(struct SoundPlugin *plugin){
#if JUCE_LINUX
  const MessageManagerLock mmLock;
#endif

  Data *data = (Data*)plugin->data;
  AudioPluginInstance *instance = data->audio_instance;

  return instance->getCurrentProgram();
}

		virtual void menuItemSelected(int menuItemID, int)
		{
			if (menuItemID == 200)
			{
				WildcardFileFilter wildcardFilter("*.mid", String::empty, "Midi files");
				FileBrowserComponent browser(FileBrowserComponent::canSelectFiles | FileBrowserComponent::openMode, 
					lastOpenedFile.exists() ? lastOpenedFile : File(String("C:\\Users\\GeorgeKrueger\\Documents")), &wildcardFilter, nullptr);
				FileChooserDialogBox dialogBox("Open a midi file",
					"Please choose a midi file to open...",
					browser,
					false,
					Colours::lightgrey);

				if (dialogBox.show())
				{
					File selectedFile = browser.getSelectedFile(0);
					lastOpenedFile = selectedFile;
					FileInputStream fileStream(selectedFile);
					juce::MidiFile midiFile;
					midiFile.readFrom(fileStream);
					int numTracks = midiFile.getNumTracks();
					midiFile.convertTimestampTicksToSeconds();
					String msg;
					msg << "Opened midi file: " << selectedFile.getFileName() << " Tracks: " << numTracks << "\n";
					log(msg);

					for (int i = 0; i < numTracks; ++i)
					{
						const MidiMessageSequence* msgSeq = midiFile.getTrack(i);
						
						OwnedArray<PluginDescription> results;
						String plugFile = "C:\\VST\\FMMF.dll";
						VSTPluginFormat vstFormat;
						vstFormat.findAllTypesForFile(results, plugFile);
						if (results.size() > 0) {
							msg.clear();
							msg << "Found " << results.size() << " plugin(s) matching file " << plugFile << "\n";
							log(msg);

							int secsToRender = 10;
							double sampleRate = 44100;
							int totalSizeInSamples = static_cast<int>(44100 * secsToRender);
							AudioPluginInstance* plugInst = vstFormat.createInstanceFromDescription(*results[0], sampleRate, totalSizeInSamples);
							if (!plugInst) {
								msg.clear();
								msg << "Failed to load plugin " << plugFile << "\n";
								log(msg);
								continue;
							}

							int numInputChannels = plugInst->getTotalNumInputChannels();
							int numOutputChannels = plugInst->getTotalNumOutputChannels();
							msg.clear();
							msg << "Plugin input channels: " << numInputChannels << " output channels: " << numOutputChannels 
								<< " Current program: " << plugInst->getCurrentProgram() << "\n";
							log(msg);

							int maxChannels = std::max(numInputChannels, numOutputChannels);
							AudioBuffer<float> buffer(maxChannels, totalSizeInSamples);
							
							MidiBuffer midiMessages;
							for (int j = 0; j < msgSeq->getNumEvents(); ++j)
							{
								MidiMessageSequence::MidiEventHolder* midiEventHolder = msgSeq->getEventPointer(j);
								MidiMessage midiMsg = midiEventHolder->message;
								int samplePos = static_cast<int>(midiMsg.getTimeStamp() * sampleRate);
								midiMessages.addEvent(midiMsg, samplePos);
							}

							plugInst->prepareToPlay(sampleRate, totalSizeInSamples);
							plugInst->processBlock(buffer, midiMessages);

							/*File txtOutFile("C:\\Users\\GeorgeKrueger\\Documents\\GitHub\\soundserver2\\out.txt");
							FileOutputStream* txtOutStream = txtOutFile.createOutputStream();
							for (int j = 0; j < 44100; ++j)
							{
								float sample = buffer.getSample(0, j);
								txtOutStream->writeFloat(sample);
								txtOutStream->writeText(" ", true, false);
							}*/

							File outputFile("C:\\Users\\GeorgeKrueger\\Documents\\GitHub\\soundserver2\\out.wav");
							if (outputFile.exists()) {
								outputFile.deleteFile();
							}
							FileOutputStream* fileOutputStream = outputFile.createOutputStream();
							WavAudioFormat wavFormat;
							StringPairArray metadataValues;
							juce::AudioFormatWriter* wavFormatWriter = wavFormat.createWriterFor(
								fileOutputStream, sampleRate, 2, 16, metadataValues, 0);
							bool writeAudioDataRet = wavFormatWriter->writeFromAudioSampleBuffer(buffer, 0, buffer.getNumSamples());
							wavFormatWriter->flush();

							msg.clear();
							msg << "Done writing to output file " << outputFile.getFileName() << " . Write return value: " 
								<< (int)writeAudioDataRet << "\n";
							log(msg);

							delete wavFormatWriter;
							delete plugInst;
//.........这里部分代码省略.........

bool handlePluginRequest(const PluginRequestParameters &params, 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);

//.........这里部分代码省略.........