// ---------------------------------------------------------------- // From Game Programming in C++ by Sanjay Madhav // Copyright (C) 2017 Sanjay Madhav. All rights reserved. // // Released under the BSD License // See LICENSE in root directory for full details. // ---------------------------------------------------------------- #include "AudioSystem.h" #include #include #include #include unsigned int AudioSystem::sNextID = 0; AudioSystem::AudioSystem(Game* game) :mGame(game) ,mSystem(nullptr) ,mLowLevelSystem(nullptr) { } AudioSystem::~AudioSystem() { } bool AudioSystem::Initialize() { // Initialize debug logging FMOD::Debug_Initialize( FMOD_DEBUG_LEVEL_ERROR, // Log only errors FMOD_DEBUG_MODE_TTY // Output to stdout ); // Create FMOD studio system object FMOD_RESULT result; result = FMOD::Studio::System::create(&mSystem); if (result != FMOD_OK) { SDL_Log("Failed to create FMOD system: %s", FMOD_ErrorString(result)); return false; } // Initialize FMOD studio system result = mSystem->initialize( 512, // Max number of concurrent sounds FMOD_STUDIO_INIT_NORMAL, // Use default settings FMOD_INIT_NORMAL, // Use default settings nullptr // Usually null ); if (result != FMOD_OK) { SDL_Log("Failed to initialize FMOD system: %s", FMOD_ErrorString(result)); return false; } // Save the low-level system pointer mSystem->getLowLevelSystem(&mLowLevelSystem); // Load the master banks (strings first) LoadBank("Assets/Master Bank.strings.bank"); LoadBank("Assets/Master Bank.bank"); return true; } void AudioSystem::Shutdown() { // Unload all banks UnloadAllBanks(); // Shutdown FMOD system if (mSystem) { mSystem->release(); } } void AudioSystem::LoadBank(const std::string& name) { // Prevent double-loading if (mBanks.find(name) != mBanks.end()) { return; } // Try to load bank FMOD::Studio::Bank* bank = nullptr; FMOD_RESULT result = mSystem->loadBankFile( name.c_str(), // File name of bank FMOD_STUDIO_LOAD_BANK_NORMAL, // Normal loading &bank // Save pointer to bank ); const int maxPathLength = 512; if (result == FMOD_OK) { // Add bank to map mBanks.emplace(name, bank); // Load all non-streaming sample data bank->loadSampleData(); // Get the number of events in this bank int numEvents = 0; bank->getEventCount(&numEvents); if (numEvents > 0) { // Get list of event descriptions in this bank std::vector<:studio::eventdescription> events(numEvents); bank->getEventList(events.data(), numEvents, &numEvents); char eventName[maxPathLength]; for (int i = 0; i < numEvents; i++) { FMOD::Studio::EventDescription* e = events[i]; // Get the path of this event (like event:/Explosion2D) e->getPath(eventName, maxPathLength, nullptr); // Add to event map mEvents.emplace(eventName, e); } } // Get the number of buses in this bank int numBuses = 0; bank->getBusCount(&numBuses); if (numBuses > 0) { // Get list of buses in this bank std::vector<:studio::bus> buses(numBuses); bank->getBusList(buses.data(), numBuses, &numBuses); char busName[512]; for (int i = 0; i < numBuses; i++) { FMOD::Studio::Bus* bus = buses[i]; // Get the path of this bus (like bus:/SFX) bus->getPath(busName, 512, nullptr); // Add to buses map mBuses.emplace(busName, bus); } } } } void AudioSystem::UnloadBank(const std::string& name) { // Ignore if not loaded auto iter = mBanks.find(name); if (iter == mBanks.end()) { return; } // First we need to remove all events from this bank FMOD::Studio::Bank* bank = iter->second; int numEvents = 0; bank->getEventCount(&numEvents); if (numEvents > 0) { // Get event descriptions for this bank std::vector<:studio::eventdescription> events(numEvents); // Get list of events bank->getEventList(events.data(), numEvents, &numEvents); char eventName[512]; for (int i = 0; i < numEvents; i++) { FMOD::Studio::EventDescription* e = events[i]; // Get the path of this event e->getPath(eventName, 512, nullptr); // Remove this event auto eventi = mEvents.find(eventName); if (eventi != mEvents.end()) { mEvents.erase(eventi); } } } // Get the number of buses in this bank int numBuses = 0; bank->getBusCount(&numBuses); if (numBuses > 0) { // Get list of buses in this bank std::vector<:studio::bus> buses(numBuses); bank->getBusList(buses.data(), numBuses, &numBuses); char busName[512]; for (int i = 0; i < numBuses; i++) { FMOD::Studio::Bus* bus = buses[i]; // Get the path of this bus (like bus:/SFX) bus->getPath(busName, 512, nullptr); // Remove this bus auto busi = mBuses.find(busName); if (busi != mBuses.end()) { mBuses.erase(busi); } } } // Unload sample data and bank bank->unloadSampleData(); bank->unload(); // Remove from banks map mBanks.erase(iter); } void AudioSystem::UnloadAllBanks() { for (auto& iter : mBanks) { // Unload the sample data, then the bank itself iter.second->unloadSampleData(); iter.second->unload(); } mBanks.clear(); // No banks means no events mEvents.clear(); } SoundEvent AudioSystem::PlayEvent(const std::string& name) { unsigned int retID = 0; auto iter = mEvents.find(name); if (iter != mEvents.end()) { // Create instance of event FMOD::Studio::EventInstance* event = nullptr; iter->second->createInstance(&event); if (event) { // Start the event instance event->start(); // Get the next id, and add to map sNextID++; retID = sNextID; mEventInstances.emplace(retID, event); } } return SoundEvent(this, retID); } void AudioSystem::Update(float deltaTime) { // Find any stopped event instances std::vector done; for (auto& iter : mEventInstances) { FMOD::Studio::EventInstance* e = iter.second; // Get the state of this event FMOD_STUDIO_PLAYBACK_STATE state; e->getPlaybackState(&state); if (state == FMOD_STUDIO_PLAYBACK_STOPPED) { // Release the event and add id to done e->release(); done.emplace_back(iter.first); } } // Remove done event instances from map for (auto id : done) { mEventInstances.erase(id); } // Update FMOD mSystem->update(); } namespace { FMOD_VECTOR VecToFMOD(const Vector3& in) { // Convert from our coordinates (+x forward, +y right, +z up) // to FMOD (+z forward, +x right, +y up) FMOD_VECTOR v; v.x = in.y; v.y = in.z; v.z = in.x; return v; } } void AudioSystem::SetListener(const Matrix4& viewMatrix) { // Invert the view matrix to get the correct vectors Matrix4 invView = viewMatrix; invView.Invert(); FMOD_3D_ATTRIBUTES listener; // Set position, forward, up listener.position = VecToFMOD(invView.GetTranslation()); // In the inverted view, third row is forward listener.forward = VecToFMOD(invView.GetZAxis()); // In the inverted view, second row is up listener.up = VecToFMOD(invView.GetYAxis()); // Set velocity to zero (fix if using Doppler effect) listener.velocity = {0.0f, 0.0f, 0.0f}; // Send to FMOD mSystem->setListenerAttributes(0, &listener); } float AudioSystem::GetBusVolume(const std::string& name) const { float retVal = 0.0f; const auto iter = mBuses.find(name); if (iter != mBuses.end()) { iter->second->getVolume(&retVal); } return retVal; } bool AudioSystem::GetBusPaused(const std::string & name) const { bool retVal = false; const auto iter = mBuses.find(name); if (iter != mBuses.end()) { iter->second->getPaused(&retVal); } return retVal; } void AudioSystem::SetBusVolume(const std::string& name, float volume) { auto iter = mBuses.find(name); if (iter != mBuses.end()) { iter->second->setVolume(volume); } } void AudioSystem::SetBusPaused(const std::string & name, bool pause) { auto iter = mBuses.find(name); if (iter != mBuses.end()) { iter->second->setPaused(pause); } } FMOD::Studio::EventInstance* AudioSystem::GetEventInstance(unsigned int id) { FMOD::Studio::EventInstance* event = nullptr; auto iter = mEventInstances.find(id); if (iter != mEventInstances.end()) { event = iter->second; } return event; }