moved vst to cross platform defs (still untested on other platforms
This commit is contained in:
itsmattkc
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#include "vsthost.h"
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// adapted from http://teragonaudio.com/article/How-to-make-your-own-VST-host.html
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#include <QPushButton>
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#include <QDialog>
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#include <QMessageBox>
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#include <QFile>
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#include <QXmlStreamWriter>
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#include "playback/audio.h"
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#include "mainwindow.h"
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#include "debug.h"
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#define BLOCK_SIZE 512
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#define CHANNEL_COUNT 2
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// C callbacks
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extern "C" {
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// Main host callback
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VstIntPtr VSTCALLBACK hostCallback(AEffect* effect, VstInt32 opcode, VstInt32 index, VstIntPtr value, void* ptr, float opt) {
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switch(opcode) {
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case audioMasterVersion:
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return 2400;
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case audioMasterIdle:
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effect->dispatcher(effect, effEditIdle, 0, 0, nullptr, 0);
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break;
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case audioMasterGetCurrentProcessLevel:
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return 0;
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// Handle other opcodes here... there will be lots of them
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case audioMasterEndEdit: // change made
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mainWindow->setWindowModified(true);
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break;
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default:
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qInfo() << "Plugin requested unhandled opcode" << opcode;
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break;
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}
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return 0;
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}
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}
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// Plugin's entry point
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typedef AEffect *(*vstPluginFuncPtr)(audioMasterCallback host);
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// Plugin's getParameter() method
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typedef float (*getParameterFuncPtr)(AEffect *effect, VstInt32 index);
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// Plugin's setParameter() method
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typedef void (*setParameterFuncPtr)(AEffect *effect, VstInt32 index, float value);
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// Plugin's processEvents() method
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typedef VstInt32 (*processEventsFuncPtr)(VstEvents *events);
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// Plugin's process() method
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typedef void (*processFuncPtr)(AEffect *effect, float **inputs, float **outputs, VstInt32 sampleFrames);
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void VSTHost::loadPlugin() {
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QString dll_fn = file_field->get_filename(0, true);
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modulePtr = LibLoad(dll_fn);
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if(modulePtr == nullptr) {
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DWORD dll_err = GetLastError();
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qCritical() << "Failed to load VST" << dll_fn << "-" << dll_err;
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#ifdef _WIN32
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QString msg_err = tr("Failed to load VST plugin \"%1\": %2").arg(dll_fn, QString::number(dll_err));
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if (dll_err == 193) {
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#ifdef _WIN64
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msg_err += "\n\n" + tr("NOTE: You can't load 32-bit VST plugins into a 64-bit build of Olive. Please find a 64-bit version of this plugin or switch to a 32-bit build of Olive.");
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#elif _WIN32
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msg_err += "\n\n" + tr("NOTE: You can't load 64-bit VST plugins into a 32-bit build of Olive. Please find a 32-bit version of this plugin or switch to a 64-bit build of Olive.");
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#endif
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#endif
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}
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QMessageBox::critical(mainWindow, tr("Error loading VST plugin"), msg_err);
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return;
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}
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vstPluginFuncPtr mainEntryPoint =
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reinterpret_cast<vstPluginFuncPtr>(LibAddress(modulePtr, "VSTPluginMain"));
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// Instantiate the plugin
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plugin = mainEntryPoint(hostCallback);
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}
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void VSTHost::freePlugin() {
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if (plugin != nullptr) {
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stopPlugin();
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LibClose(modulePtr);
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plugin = nullptr;
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}
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}
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bool VSTHost::configurePluginCallbacks() {
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// Check plugin's magic number
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// If incorrect, then the file either was not loaded properly, is not a
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// real VST plugin, or is otherwise corrupt.
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if(plugin->magic != kEffectMagic) {
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qCritical() << "Plugin's magic number is bad";
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QMessageBox::critical(mainWindow, tr("VST Error"), tr("Plugin's magic number is invalid"));
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return false;
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}
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// Create dispatcher handle
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dispatcher = reinterpret_cast<dispatcherFuncPtr>(plugin->dispatcher);
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// Set up plugin callback functions
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plugin->getParameter = reinterpret_cast<getParameterFuncPtr>(plugin->getParameter);
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plugin->processReplacing = reinterpret_cast<processFuncPtr>(plugin->processReplacing);
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plugin->setParameter = reinterpret_cast<setParameterFuncPtr>(plugin->setParameter);
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return true;
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}
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void VSTHost::startPlugin() {
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dispatcher(plugin, effOpen, 0, 0, nullptr, 0.0f);
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// Set some default properties
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dispatcher(plugin, effSetSampleRate, 0, 0, nullptr, current_audio_freq());
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dispatcher(plugin, effSetBlockSize, 0, BLOCK_SIZE, nullptr, 0.0f);
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resumePlugin();
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}
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void VSTHost::stopPlugin() {
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suspendPlugin();
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dispatcher(plugin, effClose, 0, 0, nullptr, 0);
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}
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void VSTHost::resumePlugin() {
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dispatcher(plugin, effMainsChanged, 0, 1, nullptr, 0.0f);
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}
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void VSTHost::suspendPlugin() {
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dispatcher(plugin, effMainsChanged, 0, 0, nullptr, 0.0f);
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}
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bool VSTHost::canPluginDo(char *canDoString) {
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return (dispatcher(plugin, effCanDo, 0, 0, static_cast<void*>(canDoString), 0.0f) > 0);
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}
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void VSTHost::initializeIO() {
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// inputs and outputs are assumed to be float** and are declared elsewhere,
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// most likely the are fields owned by this class. numChannels and blocksize
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// are also fields, both should be size_t (or unsigned int, if you prefer).
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inputs = new float* [CHANNEL_COUNT];
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outputs = new float* [CHANNEL_COUNT];
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for(int channel = 0; channel < CHANNEL_COUNT; channel++) {
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inputs[channel] = new float[BLOCK_SIZE];
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outputs[channel] = new float[BLOCK_SIZE];
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}
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}
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void VSTHost::processAudio(long numFrames) {
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// Always reset the output array before processing.
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for (int i=0;i<CHANNEL_COUNT;i++) {
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memset(outputs[i], 0, BLOCK_SIZE*sizeof(float));
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}
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plugin->processReplacing(plugin, inputs, outputs, numFrames);
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}
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VSTHost::VSTHost(Clip* c, const EffectMeta *em) : Effect(c, em) {
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plugin = nullptr;
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initializeIO();
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file_field = add_row(tr("Plugin"), true, false)->add_field(EFFECT_FIELD_FILE, "filename");
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connect(file_field, SIGNAL(changed()), this, SLOT(change_plugin()));
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EffectRow* interface_row = add_row(tr("Interface"), false, false);
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show_interface_btn = new QPushButton(tr("Show"));
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show_interface_btn->setCheckable(true);
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show_interface_btn->setEnabled(false);
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connect(show_interface_btn, SIGNAL(toggled(bool)), this, SLOT(show_interface(bool)));
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interface_row->add_widget(show_interface_btn);
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dialog = new QDialog(mainWindow);
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dialog->setWindowTitle(tr("VST Plugin"));
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dialog->setAttribute(Qt::WA_NativeWindow, true);
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dialog->setWindowFlags(dialog->windowFlags() | Qt::MSWindowsFixedSizeDialogHint);
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connect(dialog, SIGNAL(finished(int)), this, SLOT(uncheck_show_button()));
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}
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VSTHost::~VSTHost() {
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freePlugin();
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}
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void VSTHost::process_audio(double, double, quint8* samples, int nb_bytes, int) {
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if (plugin != nullptr) {
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int interval = BLOCK_SIZE*4;
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for (int i=0;i<nb_bytes;i+=interval) {
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int process_size = qMin(interval, nb_bytes - i);
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int lim = i + process_size;
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// convert to float
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for (int j=i;j<lim;j+=4) {
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qint16 left_sample = qint16(((samples[j+1] & 0xFF) << 8) | (samples[j] & 0xFF));
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qint16 right_sample = qint16(((samples[j+3] & 0xFF) << 8) | (samples[j+2] & 0xFF));
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int index = (j-i)>>2;
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inputs[0][index] = float(left_sample) / float(INT16_MAX);
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inputs[1][index] = float(right_sample) / float(INT16_MAX);
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}
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// send to VST
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processAudio(process_size>>2);
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// convert back to int16
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for (int j=i;j<lim;j+=4) {
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int index = (j-i)>>2;
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qint16 left_sample = qint16(qRound(outputs[0][index] * INT16_MAX));
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qint16 right_sample = qint16(qRound(outputs[1][index] * INT16_MAX));
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samples[j+3] = quint8(right_sample >> 8);
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samples[j+2] = quint8(right_sample);
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samples[j+1] = quint8(left_sample >> 8);
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samples[j] = quint8(left_sample);
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}
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}
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}
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}
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void VSTHost::custom_load(QXmlStreamReader &stream) {
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if (stream.name() == "plugindata") {
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stream.readNext();
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QByteArray b = QByteArray::fromBase64(stream.text().toUtf8());
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if (plugin != nullptr) {
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dispatcher(plugin, effSetChunk, 0, VstInt32(b.size()), static_cast<void*>(b.data()), 0);
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}
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}
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}
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void VSTHost::save(QXmlStreamWriter &stream) {
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Effect::save(stream);
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if (plugin != nullptr) {
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char* p = nullptr;
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VstInt32 length = VstInt32(dispatcher(plugin, effGetChunk, 0, 0, &p, 0));
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QByteArray b(p, length);
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stream.writeTextElement("plugindata", b.toBase64());
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}
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}
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void VSTHost::show_interface(bool show) {
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dialog->setVisible(show);
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}
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void VSTHost::uncheck_show_button() {
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show_interface_btn->setChecked(false);
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}
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void VSTHost::change_plugin() {
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freePlugin();
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loadPlugin();
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if (plugin != nullptr) {
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if (configurePluginCallbacks()) {
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startPlugin();
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dispatcher(plugin, effEditOpen, 0, 0, reinterpret_cast<HWND>(dialog->winId()), 0);
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ERect* eRect = nullptr;
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plugin->dispatcher(plugin, effEditGetRect, 0, 0, &eRect, 0);
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dialog->setFixedWidth(eRect->right);
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dialog->setFixedHeight(eRect->bottom);
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} else {
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LibClose(modulePtr);
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plugin = nullptr;
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}
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}
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show_interface_btn->setEnabled(plugin != nullptr);
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}
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