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plugin-host.cc
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plugin-host.cc
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#include <exception>
#include <iostream>
#include <memory>
#include <sstream>
#include <stdexcept>
#include <string_view>
#include <unordered_set>
#include <QDebug>
#include "application.hh"
#include "engine.hh"
#include "main-window.hh"
#include "plugin-host-settings.hh"
#include "plugin-host.hh"
#include "settings.hh"
#include <clap/helpers/host.hxx>
#include <clap/helpers/plugin-proxy.hxx>
#include <clap/helpers/reducing-param-queue.hxx>
enum class ThreadType {
Unknown,
MainThread,
AudioThread,
AudioThreadPool,
};
thread_local ThreadType g_thread_type = ThreadType::Unknown;
template class clap::helpers::Host<PluginHost_MH, PluginHost_CL>;
template class clap::helpers::PluginProxy<PluginHost_MH, PluginHost_CL>;
PluginHost::PluginHost(Engine &engine)
: QObject(&engine), _engine(engine), _settings(engine._settings.pluginHostSettings()),
BaseHost("Clap Test Host", // name
"clap", // vendor
"0.1.0", // version
"https://github.com/free-audio/clap" // url
) {
g_thread_type = ThreadType::MainThread;
initThreadPool();
}
PluginHost::~PluginHost() {
checkForMainThread();
terminateThreadPool();
}
void PluginHost::initThreadPool() {
checkForMainThread();
_threadPoolStop = false;
_threadPoolTaskIndex = 0;
auto N = QThread::idealThreadCount();
_threadPool.resize(N);
for (int i = 0; i < N; ++i) {
_threadPool[i].reset(QThread::create(&PluginHost::threadPoolEntry, this));
_threadPool[i]->start(QThread::HighestPriority);
}
}
void PluginHost::terminateThreadPool() {
checkForMainThread();
_threadPoolStop = true;
_threadPoolSemaphoreProd.release(_threadPool.size());
for (auto &thr : _threadPool)
if (thr)
thr->wait();
}
void PluginHost::threadPoolEntry() {
g_thread_type = ThreadType::AudioThreadPool;
while (true) {
_threadPoolSemaphoreProd.acquire();
if (_threadPoolStop)
return;
int taskIndex = _threadPoolTaskIndex++;
_plugin->threadPoolExec(taskIndex);
_threadPoolSemaphoreDone.release();
}
}
bool PluginHost::load(const QString &path, int pluginIndex) {
checkForMainThread();
if (_library.isLoaded())
unload();
_library.setFileName(path);
_library.setLoadHints(QLibrary::ResolveAllSymbolsHint | QLibrary::DeepBindHint);
if (!_library.load()) {
QString err = _library.errorString();
qWarning() << "Failed to load plugin '" << path << "': " << err;
return false;
}
_pluginEntry =
reinterpret_cast<const struct clap_plugin_entry *>(_library.resolve("clap_entry"));
if (!_pluginEntry) {
qWarning() << "Unable to resolve entry point 'clap_entry' in '" << path << "'";
_library.unload();
return false;
}
_pluginEntry->init(path.toStdString().c_str());
_pluginFactory =
static_cast<const clap_plugin_factory *>(_pluginEntry->get_factory(CLAP_PLUGIN_FACTORY_ID));
auto count = _pluginFactory->get_plugin_count(_pluginFactory);
if (pluginIndex > count) {
qWarning() << "plugin index greater than count :" << count;
return false;
}
auto desc = _pluginFactory->get_plugin_descriptor(_pluginFactory, pluginIndex);
if (!desc) {
qWarning() << "no plugin descriptor";
return false;
}
if (!clap_version_is_compatible(desc->clap_version)) {
qWarning() << "Incompatible clap version: Plugin is: " << desc->clap_version.major << "."
<< desc->clap_version.minor << "." << desc->clap_version.revision << " Host is "
<< CLAP_VERSION.major << "." << CLAP_VERSION.minor << "." << CLAP_VERSION.revision;
return false;
}
const auto plugin = _pluginFactory->create_plugin(_pluginFactory, clapHost(), desc->id);
if (!plugin) {
qWarning() << "could not create the plugin with id: " << desc->id;
return false;
}
_plugin = std::make_unique<PluginProxy>(*plugin, *this);
if (!_plugin->init()) {
qWarning() << "could not init the plugin with id: " << desc->id;
return false;
}
scanParams();
scanQuickControls();
pluginLoadedChanged(true);
return true;
}
void PluginHost::unload() {
checkForMainThread();
pluginLoadedChanged(false);
if (!_library.isLoaded())
return;
if (_isGuiCreated) {
_plugin->guiDestroy();
_isGuiCreated = false;
_isGuiVisible = false;
}
deactivate();
if (_plugin.get())
{
_plugin->destroy();
_plugin->reset();
}
_pluginEntry->deinit();
_pluginEntry = nullptr;
_library.unload();
}
bool PluginHost::canActivate() const {
checkForMainThread();
if (!_engine.isRunning())
return false;
if (isPluginActive())
return false;
if (_scheduleRestart)
return false;
return true;
}
void PluginHost::activate(int32_t sample_rate, int32_t blockSize) {
checkForMainThread();
if (!_plugin.get())
return;
assert(!isPluginActive());
if (!_plugin->activate(sample_rate, blockSize, blockSize)) {
setPluginState(InactiveWithError);
return;
}
_scheduleProcess = true;
setPluginState(ActiveAndSleeping);
}
void PluginHost::deactivate() {
checkForMainThread();
if (!isPluginActive())
return;
while (isPluginProcessing() || isPluginSleeping()) {
_scheduleDeactivate = true;
QThread::msleep(10);
}
_scheduleDeactivate = false;
_plugin->deactivate();
setPluginState(Inactive);
}
void PluginHost::setPorts(int numInputs, float **inputs, int numOutputs, float **outputs) {
_audioIn.channel_count = numInputs;
_audioIn.data32 = inputs;
_audioIn.data64 = nullptr;
_audioIn.constant_mask = 0;
_audioIn.latency = 0;
_audioOut.channel_count = numOutputs;
_audioOut.data32 = outputs;
_audioOut.data64 = nullptr;
_audioOut.constant_mask = 0;
_audioOut.latency = 0;
}
const char *PluginHost::getCurrentClapGuiApi() {
#if defined(Q_OS_LINUX)
return CLAP_WINDOW_API_X11;
#elif defined(Q_OS_WIN)
return CLAP_WINDOW_API_WIN32;
#elif defined(Q_OS_MACOS)
return CLAP_WINDOW_API_COCOA;
#else
# error "unsupported platform"
#endif
}
static clap_window makeClapWindow(WId window) {
clap_window w;
#if defined(Q_OS_LINUX)
w.api = CLAP_WINDOW_API_X11;
w.x11 = window;
#elif defined(Q_OS_MACX)
w.api = CLAP_WINDOW_API_COCOA;
w.cocoa = reinterpret_cast<clap_nsview>(window);
#elif defined(Q_OS_WIN)
w.api = CLAP_WINDOW_API_WIN32;
w.win32 = reinterpret_cast<clap_hwnd>(window);
#endif
return w;
}
void PluginHost::setParentWindow(WId parentWindow) {
checkForMainThread();
if (!_plugin->canUseGui())
return;
if (_isGuiCreated) {
_plugin->guiDestroy();
_isGuiCreated = false;
_isGuiVisible = false;
}
_guiApi = getCurrentClapGuiApi();
_isGuiFloating = false;
if (!_plugin->guiIsApiSupported(_guiApi, false)) {
if (!_plugin->guiIsApiSupported(_guiApi, true)) {
qWarning() << "could find a suitable gui api";
return;
}
_isGuiFloating = true;
}
auto w = makeClapWindow(parentWindow);
if (!_plugin->guiCreate(w.api, _isGuiFloating)) {
qWarning() << "could not create the plugin gui";
return;
}
_isGuiCreated = true;
assert(_isGuiVisible == false);
if (_isGuiFloating) {
_plugin->guiSetTransient(&w);
_plugin->guiSuggestTitle("using clap-host suggested title");
} else {
uint32_t width = 0;
uint32_t height = 0;
if (!_plugin->guiGetSize(&width, &height)) {
qWarning() << "could not get the size of the plugin gui";
_isGuiCreated = false;
_plugin->guiDestroy();
return;
}
Application::instance().mainWindow()->resizePluginView(width, height);
if (!_plugin->guiSetParent(&w)) {
qWarning() << "could embbed the plugin gui";
_isGuiCreated = false;
_plugin->guiDestroy();
return;
}
}
setPluginWindowVisibility(true);
}
void PluginHost::setPluginWindowVisibility(bool isVisible) {
checkForMainThread();
if (!_isGuiCreated)
return;
if (isVisible && !_isGuiVisible) {
_plugin->guiShow();
_isGuiVisible = true;
} else if (!isVisible && _isGuiVisible) {
_plugin->guiHide();
_isGuiVisible = false;
}
}
void PluginHost::requestCallback() noexcept { _scheduleMainThreadCallback = true; }
void PluginHost::requestProcess() noexcept { _scheduleProcess = true; }
void PluginHost::requestRestart() noexcept { _scheduleRestart = true; }
void PluginHost::logLog(clap_log_severity severity, const char *msg) const noexcept {
switch (severity) {
case CLAP_LOG_DEBUG:
qDebug() << msg;
break;
case CLAP_LOG_INFO:
qInfo() << msg;
break;
case CLAP_LOG_WARNING:
case CLAP_LOG_ERROR:
case CLAP_LOG_FATAL:
case CLAP_LOG_HOST_MISBEHAVING:
qWarning() << msg;
break;
}
}
bool PluginHost::threadCheckIsMainThread() const noexcept {
return g_thread_type == ThreadType::MainThread;
}
bool PluginHost::threadCheckIsAudioThread() const noexcept {
return g_thread_type == ThreadType::AudioThread;
}
void PluginHost::checkForMainThread() {
if (g_thread_type != ThreadType::MainThread) [[unlikely]] {
qFatal() << "Requires Main Thread!";
std::terminate();
}
}
void PluginHost::checkForAudioThread() {
if (g_thread_type != ThreadType::AudioThread) {
qFatal() << "Requires Audio Thread!";
std::terminate();
}
}
bool PluginHost::threadPoolRequestExec(uint32_t num_tasks) noexcept {
checkForAudioThread();
if (!_plugin->canUseThreadPool())
throw std::logic_error("Called request_exec() without providing clap_plugin_thread_pool to "
"execute the job.");
Q_ASSERT(!_threadPoolStop);
Q_ASSERT(!_threadPool.empty());
if (num_tasks == 0)
return true;
if (num_tasks == 1) {
_plugin->threadPoolExec(0);
return true;
}
_threadPoolTaskIndex = 0;
_threadPoolSemaphoreProd.release(num_tasks);
_threadPoolSemaphoreDone.acquire(num_tasks);
return true;
}
bool PluginHost::timerSupportRegisterTimer(uint32_t period_ms, clap_id *timer_id) noexcept {
checkForMainThread();
if (!_plugin->canUseTimerSupport())
throw std::logic_error(
"Called register_timer() without providing clap_plugin_timer_support.on_timer() to "
"receive the timer event.");
auto id = _nextTimerId++;
*timer_id = id;
auto timer = std::make_unique<QTimer>();
QObject::connect(timer.get(), &QTimer::timeout, [this, id] {
checkForMainThread();
_plugin->timerSupportOnTimer(id);
});
auto t = timer.get();
_timers.insert_or_assign(*timer_id, std::move(timer));
t->start(period_ms);
return true;
}
bool PluginHost::timerSupportUnregisterTimer(clap_id timer_id) noexcept {
checkForMainThread();
if (!_plugin->canUseTimerSupport())
throw std::logic_error(
"Called unregister_timer() without providing clap_plugin_timer_support.on_timer() to "
"receive the timer event.");
auto it = _timers.find(timer_id);
if (it == _timers.end())
throw std::logic_error("Called unregister_timer() for a timer_id that was not registered.");
_timers.erase(it);
return true;
}
bool PluginHost::posixFdSupportRegisterFd(int fd, clap_posix_fd_flags_t flags) noexcept {
checkForMainThread();
if (!_plugin->canUsePosixFdSupport())
throw std::logic_error("Called register_fd() without providing clap_plugin_fd_support to "
"receive the fd event.");
auto it = _fds.find(fd);
if (it != _fds.end())
throw std::logic_error(
"Called register_fd() for a fd that was already registered, use modify_fd() instead.");
_fds.insert_or_assign(fd, std::make_unique<Notifiers>());
eventLoopSetFdNotifierFlags(fd, flags);
return true;
}
bool PluginHost::posixFdSupportModifyFd(int fd, clap_posix_fd_flags_t flags) noexcept {
checkForMainThread();
if (!_plugin->canUsePosixFdSupport())
throw std::logic_error("Called modify_fd() without providing clap_plugin_fd_support to "
"receive the fd event.");
auto it = _fds.find(fd);
if (it == _fds.end())
throw std::logic_error(
"Called modify_fd() for a fd that was not registered, use register_fd() instead.");
_fds.insert_or_assign(fd, std::make_unique<Notifiers>());
eventLoopSetFdNotifierFlags(fd, flags);
return true;
}
bool PluginHost::posixFdSupportUnregisterFd(int fd) noexcept {
checkForMainThread();
if (!_plugin->canUsePosixFdSupport())
throw std::logic_error("Called unregister_fd() without providing clap_plugin_fd_support to "
"receive the fd event.");
auto it = _fds.find(fd);
if (it == _fds.end())
throw std::logic_error("Called unregister_fd() for a fd that was not registered.");
_fds.erase(it);
return true;
}
void PluginHost::eventLoopSetFdNotifierFlags(int fd, int flags) {
checkForMainThread();
auto it = _fds.find(fd);
Q_ASSERT(it != _fds.end());
if (flags & CLAP_POSIX_FD_READ) {
if (!it->second->rd) {
it->second->rd.reset(new QSocketNotifier((qintptr)fd, QSocketNotifier::Read));
QObject::connect(it->second->rd.get(), &QSocketNotifier::activated, [this, fd] {
checkForMainThread();
_plugin->posixFdSupportOnFd(fd, CLAP_POSIX_FD_READ);
});
}
it->second->rd->setEnabled(true);
} else if (it->second->rd)
it->second->rd->setEnabled(false);
if (flags & CLAP_POSIX_FD_WRITE) {
if (!it->second->wr) {
it->second->wr.reset(new QSocketNotifier((qintptr)fd, QSocketNotifier::Write));
QObject::connect(it->second->wr.get(), &QSocketNotifier::activated, [this, fd] {
checkForMainThread();
_plugin->posixFdSupportOnFd(fd, CLAP_POSIX_FD_WRITE);
});
}
it->second->wr->setEnabled(true);
} else if (it->second->wr)
it->second->wr->setEnabled(false);
}
void PluginHost::guiResizeHintsChanged() noexcept {
// TODO
}
bool PluginHost::guiRequestResize(uint32_t width, uint32_t height) noexcept {
QMetaObject::invokeMethod(
Application::instance().mainWindow(),
[width, height] { Application::instance().mainWindow()->resizePluginView(width, height); },
Qt::QueuedConnection);
return true;
}
bool PluginHost::guiRequestShow() noexcept {
QMetaObject::invokeMethod(
Application::instance().mainWindow(),
[] { Application::instance().mainWindow()->showPluginWindow(); },
Qt::QueuedConnection);
return true;
}
bool PluginHost::guiRequestHide() noexcept {
QMetaObject::invokeMethod(
Application::instance().mainWindow(),
[] { Application::instance().mainWindow()->hidePluginWindow(); },
Qt::QueuedConnection);
return true;
}
void PluginHost::guiClosed(bool wasDestroyed) noexcept { checkForMainThread(); }
void PluginHost::processBegin(int nframes) {
g_thread_type = ThreadType::AudioThread;
_process.frames_count = nframes;
_process.steady_time = _engine._steadyTime;
}
void PluginHost::processEnd(int nframes) {
g_thread_type = ThreadType::Unknown;
_process.frames_count = nframes;
_process.steady_time = _engine._steadyTime;
}
void PluginHost::processNoteOn(int sampleOffset, int channel, int key, int velocity) {
checkForAudioThread();
clap_event_note ev;
ev.header.space_id = CLAP_CORE_EVENT_SPACE_ID;
ev.header.type = CLAP_EVENT_NOTE_ON;
ev.header.time = sampleOffset;
ev.header.flags = 0;
ev.header.size = sizeof(ev);
ev.port_index = 0;
ev.key = key;
ev.channel = channel;
ev.note_id = -1;
ev.velocity = velocity / 127.0;
_evIn.push(&ev.header);
}
void PluginHost::processNoteOff(int sampleOffset, int channel, int key, int velocity) {
checkForAudioThread();
clap_event_note ev;
ev.header.space_id = CLAP_CORE_EVENT_SPACE_ID;
ev.header.type = CLAP_EVENT_NOTE_OFF;
ev.header.time = sampleOffset;
ev.header.flags = 0;
ev.header.size = sizeof(ev);
ev.port_index = 0;
ev.key = key;
ev.channel = channel;
ev.note_id = -1;
ev.velocity = velocity / 127.0;
_evIn.push(&ev.header);
}
void PluginHost::processNoteAt(int sampleOffset, int channel, int key, int pressure) {
checkForAudioThread();
// TODO
}
void PluginHost::processPitchBend(int sampleOffset, int channel, int value) {
checkForAudioThread();
// TODO
}
void PluginHost::processCC(int sampleOffset, int channel, int cc, int value) {
checkForAudioThread();
clap_event_midi ev;
ev.header.space_id = CLAP_CORE_EVENT_SPACE_ID;
ev.header.type = CLAP_EVENT_MIDI;
ev.header.time = sampleOffset;
ev.header.flags = 0;
ev.header.size = sizeof(ev);
ev.port_index = 0;
ev.data[0] = 0xB0 | channel;
ev.data[1] = cc;
ev.data[2] = value;
_evIn.push(&ev.header);
}
void PluginHost::process() {
checkForAudioThread();
if (!_plugin.get())
return;
// Can't process a plugin that is not active
if (!isPluginActive())
return;
// Do we want to deactivate the plugin?
if (_scheduleDeactivate) {
_scheduleDeactivate = false;
if (_state == ActiveAndProcessing)
_plugin->stopProcessing();
setPluginState(ActiveAndReadyToDeactivate);
return;
}
// We can't process a plugin which failed to start processing
if (_state == ActiveWithError)
return;
_process.transport = nullptr;
_process.in_events = _evIn.clapInputEvents();
_process.out_events = _evOut.clapOutputEvents();
_process.audio_inputs = &_audioIn;
_process.audio_inputs_count = 1;
_process.audio_outputs = &_audioOut;
_process.audio_outputs_count = 1;
_evOut.clear();
generatePluginInputEvents();
if (isPluginSleeping()) {
if (!_scheduleProcess && _evIn.empty())
// The plugin is sleeping, there is no request to wake it up and there are no events to
// process
return;
_scheduleProcess = false;
if (!_plugin->startProcessing()) {
// the plugin failed to start processing
setPluginState(ActiveWithError);
return;
}
setPluginState(ActiveAndProcessing);
}
int32_t status = CLAP_PROCESS_SLEEP;
if (isPluginProcessing())
status = _plugin->process(&_process);
handlePluginOutputEvents();
_evOut.clear();
_evIn.clear();
_engineToAppValueQueue.producerDone();
// TODO: send plugin to sleep if possible
g_thread_type = ThreadType::Unknown;
}
void PluginHost::generatePluginInputEvents() {
_appToEngineValueQueue.consume(
[this](clap_id param_id, const AppToEngineParamQueueValue &value) {
clap_event_param_value ev;
ev.header.time = 0;
ev.header.type = CLAP_EVENT_PARAM_VALUE;
ev.header.space_id = CLAP_CORE_EVENT_SPACE_ID;
ev.header.flags = 0;
ev.header.size = sizeof(ev);
ev.param_id = param_id;
ev.cookie = _settings.shouldProvideCookie() ? value.cookie : nullptr;
ev.port_index = 0;
ev.key = -1;
ev.channel = -1;
ev.note_id = -1;
ev.value = value.value;
_evIn.push(&ev.header);
});
_appToEngineModQueue.consume([this](clap_id param_id, const AppToEngineParamQueueValue &value) {
clap_event_param_mod ev;
ev.header.time = 0;
ev.header.type = CLAP_EVENT_PARAM_MOD;
ev.header.space_id = CLAP_CORE_EVENT_SPACE_ID;
ev.header.flags = 0;
ev.header.size = sizeof(ev);
ev.param_id = param_id;
ev.cookie = _settings.shouldProvideCookie() ? value.cookie : nullptr;
ev.port_index = 0;
ev.key = -1;
ev.channel = -1;
ev.note_id = -1;
ev.amount = value.value;
_evIn.push(&ev.header);
});
}
void PluginHost::handlePluginOutputEvents() {
for (uint32_t i = 0; i < _evOut.size(); ++i) {
auto h = _evOut.get(i);
switch (h->type) {
case CLAP_EVENT_PARAM_GESTURE_BEGIN: {
auto ev = reinterpret_cast<const clap_event_param_gesture *>(h);
bool &isAdj = _isAdjustingParameter[ev->param_id];
if (isAdj)
throw std::logic_error("The plugin sent BEGIN_ADJUST twice");
isAdj = true;
EngineToAppParamQueueValue v;
v.has_gesture = true;
v.is_begin = true;
_engineToAppValueQueue.setOrUpdate(ev->param_id, v);
break;
}
case CLAP_EVENT_PARAM_GESTURE_END: {
auto ev = reinterpret_cast<const clap_event_param_gesture *>(h);
bool &isAdj = _isAdjustingParameter[ev->param_id];
if (!isAdj)
throw std::logic_error("The plugin sent END_ADJUST without a preceding BEGIN_ADJUST");
isAdj = false;
EngineToAppParamQueueValue v;
v.has_gesture = true;
v.is_begin = false;
_engineToAppValueQueue.setOrUpdate(ev->param_id, v);
break;
}
case CLAP_EVENT_PARAM_VALUE: {
auto ev = reinterpret_cast<const clap_event_param_value *>(h);
EngineToAppParamQueueValue v;
v.has_value = true;
v.value = ev->value;
_engineToAppValueQueue.setOrUpdate(ev->param_id, v);
break;
}
}
}
}
void PluginHost::paramFlushOnMainThread() {
checkForMainThread();
assert(!isPluginActive());
_scheduleParamFlush = false;
_evIn.clear();
_evOut.clear();
generatePluginInputEvents();
if (_plugin->canUseParams())
_plugin->paramsFlush(_evIn.clapInputEvents(), _evOut.clapOutputEvents());
handlePluginOutputEvents();
_evOut.clear();
_engineToAppValueQueue.producerDone();
}
void PluginHost::idle() {
checkForMainThread();
// Try to send events to the audio engine
_appToEngineValueQueue.producerDone();
_appToEngineModQueue.producerDone();
_engineToAppValueQueue.consume(
[this](clap_id param_id, const EngineToAppParamQueueValue &value) {
auto it = _params.find(param_id);
if (it == _params.end()) {
std::ostringstream msg;
msg << "Plugin produced a CLAP_EVENT_PARAM_SET with an unknown param_id: " << param_id;
throw std::invalid_argument(msg.str());
}
if (value.has_value)
it->second->setValue(value.value);
if (value.has_gesture)
it->second->setIsAdjusting(value.is_begin);
emit paramAdjusted(param_id);
});
if (_scheduleParamFlush && !isPluginActive()) {
paramFlushOnMainThread();
}
if (_scheduleMainThreadCallback) {
_scheduleMainThreadCallback = false;
_plugin->onMainThread();
}
if (_scheduleRestart) {
deactivate();
_scheduleRestart = false;
activate(_engine._sampleRate, _engine._nframes);
}
}
PluginParam &PluginHost::checkValidParamId(const std::string_view &function,
const std::string_view ¶m_name,
clap_id param_id) {
checkForMainThread();
if (param_id == CLAP_INVALID_ID) {
std::ostringstream msg;
msg << "Plugin called " << function << " with " << param_name << " == CLAP_INVALID_ID";
throw std::invalid_argument(msg.str());
}
auto it = _params.find(param_id);
if (it == _params.end()) {
std::ostringstream msg;
msg << "Plugin called " << function << " with an invalid " << param_name
<< " == " << param_id;
throw std::invalid_argument(msg.str());
}
Q_ASSERT(it->first == param_id);
Q_ASSERT(it->second->info().id == param_id);
return *it->second;
}
void PluginHost::checkValidParamValue(const PluginParam ¶m, double value) {
checkForMainThread();
if (!param.isValueValid(value)) {
std::ostringstream msg;
msg << "Invalid value for param. ";
param.printInfo(msg);
msg << "; value: " << value;
// std::cerr << msg.str() << std::endl;
throw std::invalid_argument(msg.str());
}
}
void PluginHost::setParamValueByHost(PluginParam ¶m, double value) {
checkForMainThread();
param.setValue(value);
_appToEngineValueQueue.set(param.info().id, {param.info().cookie, value});
_appToEngineValueQueue.producerDone();
paramsRequestFlush();
}
void PluginHost::setParamModulationByHost(PluginParam ¶m, double value) {
checkForMainThread();
param.setModulation(value);
_appToEngineModQueue.set(param.info().id, {param.info().cookie, value});
_appToEngineModQueue.producerDone();
paramsRequestFlush();
}
void PluginHost::scanParams() { paramsRescan(CLAP_PARAM_RESCAN_ALL); }
void PluginHost::paramsRescan(uint32_t flags) noexcept {
checkForMainThread();
if (!_plugin->canUseParams())
return;
// 1. it is forbidden to use CLAP_PARAM_RESCAN_ALL if the plugin is active
if (isPluginActive() && (flags & CLAP_PARAM_RESCAN_ALL)) {
throw std::logic_error(
"clap_host_params.recan(CLAP_PARAM_RESCAN_ALL) was called while the plugin is active!");
return;
}
// 2. scan the params.
auto count = _plugin->paramsCount();
std::unordered_set<clap_id> paramIds(count * 2);
for (int32_t i = 0; i < count; ++i) {
clap_param_info info;
if (!_plugin->paramsGetInfo(i, &info))
throw std::logic_error("clap_plugin_params.get_info did return false!");
if (info.id == CLAP_INVALID_ID) {
std::ostringstream msg;
msg << "clap_plugin_params.get_info() reported a parameter with id = CLAP_INVALID_ID"
<< std::endl
<< " 2. name: " << info.name << ", module: " << info.module << std::endl;
throw std::logic_error(msg.str());
}
auto it = _params.find(info.id);
// check that the parameter is not declared twice
if (paramIds.count(info.id) > 0) {
Q_ASSERT(it != _params.end());
std::ostringstream msg;
msg << "the parameter with id: " << info.id << " was declared twice." << std::endl
<< " 1. name: " << it->second->info().name << ", module: " << it->second->info().module
<< std::endl
<< " 2. name: " << info.name << ", module: " << info.module << std::endl;
throw std::logic_error(msg.str());
}
paramIds.insert(info.id);
if (it == _params.end()) {
if (!(flags & CLAP_PARAM_RESCAN_ALL)) {
std::ostringstream msg;
msg << "a new parameter was declared, but the flag CLAP_PARAM_RESCAN_ALL was not "
"specified; id: "
<< info.id << ", name: " << info.name << ", module: " << info.module << std::endl;
throw std::logic_error(msg.str());
}
double value = getParamValue(info);
auto param = std::make_unique<PluginParam>(*this, info, value);
checkValidParamValue(*param, value);
_params.insert_or_assign(info.id, std::move(param));
} else {
// update param info
if (!it->second->isInfoEqualTo(info)) {
if (!clapParamsRescanMayInfoChange(flags)) {
std::ostringstream msg;
msg << "a parameter's info did change, but the flag CLAP_PARAM_RESCAN_INFO "
"was not specified; id: "
<< info.id << ", name: " << info.name << ", module: " << info.module
<< std::endl;
throw std::logic_error(msg.str());
}
if (!(flags & CLAP_PARAM_RESCAN_ALL) &&
!it->second->isInfoCriticallyDifferentTo(info)) {
std::ostringstream msg;
msg << "a parameter's info has critical changes, but the flag CLAP_PARAM_RESCAN_ALL "
"was not specified; id: "
<< info.id << ", name: " << info.name << ", module: " << info.module
<< std::endl;
throw std::logic_error(msg.str());
}
it->second->setInfo(info);
}
double value = getParamValue(info);
if (it->second->value() != value) {
if (!clapParamsRescanMayValueChange(flags)) {