Multiple thread safety improvements to AudioManager and VideoFFmpegComponent.

Also some general refactoring and re-enabling of some SDL_AudioStream functions.

es-app/src/MediaViewer.cpp

@@ -12,7 +12,6 @@
 #if defined(BUILD_VLC_PLAYER)
 #include "components/VideoVlcComponent.h"
 #endif
-#include "AudioManager.h"
 #include "Sound.h"
 #include "views/ViewController.h"
 
@@ -59,7 +58,7 @@ bool MediaViewer::startMediaViewer(FileData* game)
 
 void MediaViewer::stopMediaViewer()
 {
-    NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+    NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
     ViewController::get()->onStopVideo();
 
     if (mVideo) {
@@ -197,7 +196,7 @@ void MediaViewer::findMedia()
 void MediaViewer::showNext()
 {
     if (mHasImages && mCurrentImageIndex != static_cast<int>(mImageFiles.size()) - 1)
-        NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+        NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
 
     bool showedVideo = false;
 
@@ -229,7 +228,7 @@ void MediaViewer::showNext()
 void MediaViewer::showPrevious()
 {
     if ((mHasVideo && mDisplayingImage) || (!mHasVideo && mCurrentImageIndex != 0))
-        NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+        NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
 
     if (mCurrentImageIndex == 0 && !mHasVideo) {
         return;

es-app/src/guis/GuiGamelistOptions.cpp

@@ -310,7 +310,7 @@ GuiGamelistOptions::~GuiGamelistOptions()
     }
 
     if (mSystem->getRootFolder()->getChildren().size() != 0 && mSystem->getName() != "recent")
-        NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+        NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
 }
 
 void GuiGamelistOptions::openGamelistFilter()
@@ -356,7 +356,7 @@ void GuiGamelistOptions::startEditMode()
     }
 
     if (mSystem->getRootFolder()->getChildren().size() == 0)
-        NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+        NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
     delete this;
 }
 
@@ -364,7 +364,7 @@ void GuiGamelistOptions::exitEditMode()
 {
     CollectionSystemsManager::get()->exitEditMode();
     if (mSystem->getRootFolder()->getChildren().size() == 0)
-        NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+        NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
     delete this;
 }
 

es-app/src/main.cpp

@@ -704,8 +704,7 @@ int main(int argc, char* argv[])
     MameNames::deinit();
     CollectionSystemsManager::deinit();
     SystemData::deleteSystems();
-    NavigationSounds::getInstance()->deinit();
+    NavigationSounds::getInstance().deinit();
-    Settings::deinit();
 
 #if defined(FREEIMAGE_LIB)
     // Call this ONLY when linking with FreeImage as a static library.

es-app/src/views/SystemView.cpp

@@ -284,14 +284,14 @@ bool SystemView::input(InputConfig* config, Input input)
         if (config->isMappedTo("a", input)) {
             stopScrolling();
             ViewController::get()->goToGameList(getSelected());
-            NavigationSounds::getInstance()->playThemeNavigationSound(SELECTSOUND);
+            NavigationSounds::getInstance().playThemeNavigationSound(SELECTSOUND);
             return true;
         }
         if (Settings::getInstance()->getBool("RandomAddButton") &&
             (config->isMappedTo("leftthumbstickclick", input) ||
              config->isMappedTo("rightthumbstickclick", input))) {
             // Get a random system and jump to it.
-            NavigationSounds::getInstance()->playThemeNavigationSound(SYSTEMBROWSESOUND);
+            NavigationSounds::getInstance().playThemeNavigationSound(SYSTEMBROWSESOUND);
             setCursor(SystemData::getRandomSystem(getSelected()));
             return true;
         }

es-app/src/views/SystemView.h

@@ -77,7 +77,7 @@ protected:
     void onCursorChanged(const CursorState& state) override;
     virtual void onScroll() override
     {
-        NavigationSounds::getInstance()->playThemeNavigationSound(SYSTEMBROWSESOUND);
+        NavigationSounds::getInstance().playThemeNavigationSound(SYSTEMBROWSESOUND);
     }
 
 private:

es-app/src/views/ViewController.cpp

@@ -12,7 +12,6 @@
 
 #include "views/ViewController.h"
 
-#include "AudioManager.h"
 #include "FileFilterIndex.h"
 #include "InputManager.h"
 #include "Log.h"
@@ -413,7 +412,7 @@ void ViewController::goToNextGameList()
     assert(mState.viewing == GAME_LIST);
     SystemData* system = getState().getSystem();
     assert(system);
-    NavigationSounds::getInstance()->playThemeNavigationSound(QUICKSYSSELECTSOUND);
+    NavigationSounds::getInstance().playThemeNavigationSound(QUICKSYSSELECTSOUND);
     mNextSystem = true;
     goToGameList(system->getNext());
 }
@@ -423,7 +422,7 @@ void ViewController::goToPrevGameList()
     assert(mState.viewing == GAME_LIST);
     SystemData* system = getState().getSystem();
     assert(system);
-    NavigationSounds::getInstance()->playThemeNavigationSound(QUICKSYSSELECTSOUND);
+    NavigationSounds::getInstance().playThemeNavigationSound(QUICKSYSSELECTSOUND);
     mNextSystem = false;
     goToGameList(system->getPrev());
 }
@@ -717,7 +716,7 @@ void ViewController::launch(FileData* game)
     if (durationString != "disabled")
         mWindow->displayLaunchScreen(game->getSourceFileData());
 
-    NavigationSounds::getInstance()->playThemeNavigationSound(LAUNCHSOUND);
+    NavigationSounds::getInstance().playThemeNavigationSound(LAUNCHSOUND);
 
     // This is just a dummy animation in order for the launch screen or notification popup
     // to be displayed briefly, and for the navigation sound playing to be able to complete.
@@ -976,13 +975,13 @@ void ViewController::preload()
     bool themeSoundSupport = false;
     for (SystemData* system : SystemData::sSystemVector) {
         if (system->getTheme()->hasView("all")) {
-            NavigationSounds::getInstance()->loadThemeNavigationSounds(system->getTheme());
+            NavigationSounds::getInstance().loadThemeNavigationSounds(system->getTheme().get());
             themeSoundSupport = true;
             break;
         }
     }
     if (!SystemData::sSystemVector.empty() && !themeSoundSupport)
-        NavigationSounds::getInstance()->loadThemeNavigationSounds(nullptr);
+        NavigationSounds::getInstance().loadThemeNavigationSounds(nullptr);
 }
 
 void ViewController::reloadGameListView(IGameListView* view, bool reloadTheme)
@@ -1070,17 +1069,17 @@ void ViewController::reloadAll()
 
     // Load navigation sounds, either from the theme if it supports it, or otherwise from
     // the bundled fallback sound files.
-    NavigationSounds::getInstance()->deinit();
+    NavigationSounds::getInstance().deinit();
     bool themeSoundSupport = false;
     for (SystemData* system : SystemData::sSystemVector) {
         if (system->getTheme()->hasView("all")) {
-            NavigationSounds::getInstance()->loadThemeNavigationSounds(system->getTheme());
+            NavigationSounds::getInstance().loadThemeNavigationSounds(system->getTheme().get());
             themeSoundSupport = true;
             break;
         }
     }
     if (!SystemData::sSystemVector.empty() && !themeSoundSupport)
-        NavigationSounds::getInstance()->loadThemeNavigationSounds(nullptr);
+        NavigationSounds::getInstance().loadThemeNavigationSounds(nullptr);
 
     mCurrentView->onShow();
     updateHelpPrompts();

es-app/src/views/gamelist/GridGameListView.cpp

@@ -168,15 +168,15 @@ bool GridGameListView::input(InputConfig* config, Input input)
     if (input.value == 0 &&
         (config->isMappedLike("left", input) || config->isMappedLike("right", input) ||
          (config->isMappedLike("up", input)) || (config->isMappedLike("down", input))))
-        NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+        NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
 
     if (input.value != 0 && config->isMappedLike("righttrigger", input)) {
-        NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+        NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
         mGrid.setCursor(mGrid.getLast());
     }
 
     if (input.value != 0 && config->isMappedLike("lefttrigger", input)) {
-        NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+        NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
         mGrid.setCursor(mGrid.getFirst());
     }
 

es-app/src/views/gamelist/ISimpleGameListView.cpp

@@ -114,7 +114,7 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
                 // It's a folder.
                 if (cursor->getChildren().size() > 0) {
                     ViewController::get()->cancelViewTransitions();
-                    NavigationSounds::getInstance()->playThemeNavigationSound(SELECTSOUND);
+                    NavigationSounds::getInstance().playThemeNavigationSound(SELECTSOUND);
                     mCursorStack.push(cursor);
                     populateList(cursor->getChildrenListToDisplay(), cursor);
 
@@ -140,7 +140,7 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
                         updateHelpPrompts();
                 }
                 else {
-                    NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+                    NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
                 }
             }
 
@@ -151,7 +151,7 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
             if (mCursorStack.size()) {
                 // Save the position to the cursor stack history.
                 mCursorStackHistory.push_back(getCursor());
-                NavigationSounds::getInstance()->playThemeNavigationSound(BACKSOUND);
+                NavigationSounds::getInstance().playThemeNavigationSound(BACKSOUND);
                 populateList(mCursorStack.top()->getParent()->getChildrenListToDisplay(),
                              mCursorStack.top()->getParent());
                 setCursor(mCursorStack.top());
@@ -161,7 +161,7 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
                     updateHelpPrompts();
             }
             else {
-                NavigationSounds::getInstance()->playThemeNavigationSound(BACKSOUND);
+                NavigationSounds::getInstance().playThemeNavigationSound(BACKSOUND);
                 onPauseVideo();
                 onFocusLost();
                 stopListScrolling();
@@ -178,14 +178,14 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
         }
         else if (config->isMappedTo("x", input)) {
             if (getCursor()->getType() == PLACEHOLDER) {
-                NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+                NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
                 return true;
             }
             else if (config->isMappedTo("x", input) &&
                      mRoot->getSystem()->getThemeFolder() == "custom-collections" &&
                      mCursorStack.empty() &&
                      ViewController::get()->getState().viewing == ViewController::GAME_LIST) {
-                NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+                NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
                 // Jump to the randomly selected game.
                 if (mRandomGame) {
                     stopListScrolling();
@@ -197,7 +197,7 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
             else if (mRoot->getSystem()->isGameSystem()) {
                 stopListScrolling();
                 ViewController::get()->cancelViewTransitions();
-                NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+                NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
                 mWindow->startMediaViewer(getCursor());
                 return true;
             }
@@ -228,7 +228,7 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
             if (mRoot->getSystem()->isGameSystem() && getCursor()->getType() != PLACEHOLDER) {
                 stopListScrolling();
                 // Jump to a random game.
-                NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+                NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
                 FileData* randomGame = getCursor()->getSystem()->getRandomGame(getCursor());
                 if (randomGame)
                     setCursor(randomGame);
@@ -241,7 +241,7 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
                  ViewController::get()->getState().viewing == ViewController::GAME_LIST) {
             // Jump to the randomly selected game.
             if (mRandomGame) {
-                NavigationSounds::getInstance()->playThemeNavigationSound(SELECTSOUND);
+                NavigationSounds::getInstance().playThemeNavigationSound(SELECTSOUND);
                 // If there is already an mCursorStackHistory entry for the collection, then
                 // remove it so we don't get multiple entries.
                 std::vector<FileData*> listEntries =
@@ -257,7 +257,7 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
                 updateHelpPrompts();
             }
             else {
-                NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+                NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
             }
         }
         else if (config->isMappedTo("y", input) &&
@@ -272,19 +272,19 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
             if (CollectionSystemsManager::get()->isEditing() &&
                 mRoot->getSystem()->isGameSystem() && getCursor()->getType() != PLACEHOLDER &&
                 getCursor()->getParent()->getPath() == "collections") {
-                NavigationSounds::getInstance()->playThemeNavigationSound(FAVORITESOUND);
+                NavigationSounds::getInstance().playThemeNavigationSound(FAVORITESOUND);
                 mWindow->queueInfoPopup("CAN'T ADD CUSTOM COLLECTIONS TO CUSTOM COLLECTIONS", 4000);
             }
             // Notify the user if attempting to add a placeholder to a custom collection.
             if (CollectionSystemsManager::get()->isEditing() &&
                 mRoot->getSystem()->isGameSystem() && getCursor()->getType() == PLACEHOLDER) {
-                NavigationSounds::getInstance()->playThemeNavigationSound(FAVORITESOUND);
+                NavigationSounds::getInstance().playThemeNavigationSound(FAVORITESOUND);
                 mWindow->queueInfoPopup("CAN'T ADD PLACEHOLDERS TO CUSTOM COLLECTIONS", 4000);
             }
             else if (mRoot->getSystem()->isGameSystem() && getCursor()->getType() != PLACEHOLDER &&
                      getCursor()->getParent()->getPath() != "collections") {
                 if (getCursor()->getType() == GAME || getCursor()->getType() == FOLDER)
-                    NavigationSounds::getInstance()->playThemeNavigationSound(FAVORITESOUND);
+                    NavigationSounds::getInstance().playThemeNavigationSound(FAVORITESOUND);
                 // When marking or unmarking a game as favorite, don't jump to the new position
                 // it gets after the gamelist sorting. Instead retain the cursor position in the
                 // list using the logic below.
@@ -474,7 +474,7 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
                 }
             }
             else if (config->isMappedTo("y", input) && getCursor()->isPlaceHolder()) {
-                NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+                NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
             }
         }
     }

es-core/src/AudioManager.cpp

@@ -14,16 +14,6 @@
 
 #include <SDL2/SDL.h>
 
-std::shared_ptr<AudioManager> AudioManager::sInstance;
-std::vector<std::shared_ptr<Sound>> AudioManager::sSoundVector;
-SDL_AudioDeviceID AudioManager::sAudioDevice = 0;
-SDL_AudioSpec AudioManager::sAudioFormat;
-SDL_AudioStream* AudioManager::sConversionStream;
-
-bool AudioManager::sMuteStream = false;
-bool AudioManager::sHasAudioDevice = true;
-bool AudioManager::mIsClearingStream = false;
-
 AudioManager::AudioManager()
 {
     // Init on construction.
@@ -36,13 +26,10 @@ AudioManager::~AudioManager()
     deinit();
 }
 
-std::shared_ptr<AudioManager>& AudioManager::getInstance()
+AudioManager& AudioManager::getInstance()
 {
-    // Check if an AudioManager instance is already created, and if not then create it.
+    static AudioManager instance;
-    if (sInstance == nullptr)
+    return instance;
-        sInstance = std::shared_ptr<AudioManager>(new AudioManager);
-
-    return sInstance;
 }
 
 void AudioManager::init()
@@ -126,15 +113,12 @@ void AudioManager::init()
 
 void AudioManager::deinit()
 {
-    // Due to bugs in SDL, freeing the stream causes random crashes. This is reported to the
+    SDL_LockAudioDevice(sAudioDevice);
-    // user on some operating systems such as macOS, and it's annoying to have a crash at the
+    SDL_FreeAudioStream(sConversionStream);
-    // end of debugging session. So we'll simply disable the function until it has been properly
+    SDL_UnlockAudioDevice(sAudioDevice);
-    // fixed in the SDL library.
-    //    SDL_FreeAudioStream(sConversionStream);
 
     SDL_CloseAudio();
     SDL_QuitSubSystem(SDL_INIT_AUDIO);
-    sInstance = nullptr;
 }
 
 void AudioManager::mixAudio(void* /*unused*/, Uint8* stream, int len)
@@ -172,13 +156,10 @@ void AudioManager::mixAudio(void* /*unused*/, Uint8* stream, int len)
         soundIt++;
     }
 
-    int streamLength = 0;
-
     // Process video stream audio generated by VideoFFmpegComponent.
-    if (!mIsClearingStream)
+    int streamLength = SDL_AudioStreamAvailable(sConversionStream);
-        streamLength = SDL_AudioStreamAvailable(sConversionStream);
 
-    if (streamLength <= 0 || mIsClearingStream) {
+    if (streamLength <= 0) {
         // If nothing is playing, pause the device until there is more audio to output.
         if (!stillPlaying)
             SDL_PauseAudioDevice(sAudioDevice, 1);
@@ -213,7 +194,10 @@ void AudioManager::mixAudio(void* /*unused*/, Uint8* stream, int len)
     // stream is not played when the video player has been stopped. Otherwise there would
     // be a short time period when the audio would keep playing after the video was stopped
     // and before the stream was cleared in clearStream().
-    if (sMuteStream) {
+    std::unique_lock<std::mutex> audioLock{mAudioLock};
+    bool muteStream = sMuteStream;
+    audioLock.unlock();
+    if (muteStream) {
         SDL_MixAudioFormat(stream, &converted.at(0), sAudioFormat.format, processedLength, 0);
     }
     else {
@@ -227,13 +211,13 @@ void AudioManager::mixAudio(void* /*unused*/, Uint8* stream, int len)
         SDL_PauseAudioDevice(sAudioDevice, 1);
 }
 
-void AudioManager::registerSound(std::shared_ptr<Sound>& sound)
+void AudioManager::registerSound(std::shared_ptr<Sound> sound)
 {
     // Add sound to sound vector.
     sSoundVector.push_back(sound);
 }
 
-void AudioManager::unregisterSound(std::shared_ptr<Sound>& sound)
+void AudioManager::unregisterSound(std::shared_ptr<Sound> sound)
 {
     for (unsigned int i = 0; i < sSoundVector.size(); i++) {
         if (sSoundVector.at(i) == sound) {
@@ -286,32 +270,36 @@ void AudioManager::setupAudioStream(int sampleRate)
 
 void AudioManager::processStream(const void* samples, unsigned count)
 {
-    if (mIsClearingStream)
+    SDL_LockAudioDevice(sAudioDevice);
-        return;
 
     if (SDL_AudioStreamPut(sConversionStream, samples, count * sizeof(Uint8)) == -1) {
         LOG(LogError) << "Failed to put samples in the conversion stream:";
         LOG(LogError) << SDL_GetError();
+        SDL_UnlockAudioDevice(sAudioDevice);
         return;
     }
 
     if (count > 0)
         SDL_PauseAudioDevice(sAudioDevice, 0);
+
+    SDL_UnlockAudioDevice(sAudioDevice);
 }
 
 void AudioManager::clearStream()
 {
-    // The SDL_AudioStreamClear() function is unstable and causes random crashes, so
+    SDL_LockAudioDevice(sAudioDevice);
-    // we have to implement a workaround instead where SDL_AudioStreamGet() is used
+    SDL_AudioStreamClear(sConversionStream);
-    // to empty the stream.
+    SDL_UnlockAudioDevice(sAudioDevice);
-    //    SDL_AudioStreamClear(sConversionStream);
+
+    // TEMPORARY: For evaluating if SDL_AudioStreamClear is stable.
+    return;
 
     // If sSoundVector is empty it means we are shutting down. In this case don't attempt
     // to clear the stream as this could lead to a crash.
     if (sSoundVector.empty())
         return;
 
-    mIsClearingStream = true;
+    SDL_LockAudioDevice(sAudioDevice);
 
     // This code is required as there's seemingly a bug in SDL_AudioStreamAvailable().
     // The function sometimes returns 0 even if there is data left in the buffer, possibly
@@ -323,13 +311,13 @@ void AudioManager::clearStream()
     // Fortunately the SDL_AudioStreamGet() function acts correctly on any arbitrary sample size
     // so we can actually clear the entire buffer. If this workaround was not implemented, there
     // would be a sound glitch when some samples from the previous video would play any time a
-    // new video was started (assuming the issue was triggered be some remaining buffer data).
+    // new video was started (assuming the issue was triggered by some remaining stream data).
     std::vector<Uint8> writeBuffer(10000);
     if (SDL_AudioStreamPut(sConversionStream, reinterpret_cast<const void*>(&writeBuffer.at(0)),
                            10000) == -1) {
         LOG(LogError) << "Failed to put samples in the conversion stream:";
         LOG(LogError) << SDL_GetError();
-        mIsClearingStream = false;
+        SDL_UnlockAudioDevice(sAudioDevice);
         return;
     }
 
@@ -338,5 +326,5 @@ void AudioManager::clearStream()
     std::vector<Uint8> readBuffer(length);
     SDL_AudioStreamGet(sConversionStream, static_cast<void*>(&readBuffer.at(0)), length);
 
-    mIsClearingStream = false;
+    SDL_UnlockAudioDevice(sAudioDevice);
 }

es-core/src/AudioManager.h

@@ -11,6 +11,7 @@
 
 #include <SDL2/SDL_audio.h>
 #include <memory>
+#include <mutex>
 #include <vector>
 
 class Sound;
@@ -19,13 +20,13 @@ class AudioManager
 {
 public:
     virtual ~AudioManager();
-    static std::shared_ptr<AudioManager>& getInstance();
+    static AudioManager& getInstance();
 
     void init();
     void deinit();
 
-    void registerSound(std::shared_ptr<Sound>& sound);
+    void registerSound(std::shared_ptr<Sound> sound);
-    void unregisterSound(std::shared_ptr<Sound>& sound);
+    void unregisterSound(std::shared_ptr<Sound> sound);
 
     void play();
     void stop();
@@ -35,25 +36,33 @@ public:
     void processStream(const void* samples, unsigned count);
     void clearStream();
 
-    void muteStream() { sMuteStream = true; }
+    void muteStream()
-    void unmuteStream() { sMuteStream = false; }
+    {
+        std::unique_lock<std::mutex> audioLock{mAudioLock};
+        sMuteStream = true;
+    }
+    void unmuteStream()
+    {
+        std::unique_lock<std::mutex> audioLock{mAudioLock};
+        sMuteStream = false;
+    }
 
     bool getHasAudioDevice() { return sHasAudioDevice; }
 
-    static SDL_AudioDeviceID sAudioDevice;
+    inline static SDL_AudioDeviceID sAudioDevice = 0;
-    static SDL_AudioSpec sAudioFormat;
+    inline static SDL_AudioSpec sAudioFormat;
 
 private:
     AudioManager();
 
     static void mixAudio(void* unused, Uint8* stream, int len);
     static void mixAudio2(void* unused, Uint8* stream, int len);
-    static SDL_AudioStream* sConversionStream;
+
-    static std::vector<std::shared_ptr<Sound>> sSoundVector;
+    inline static std::mutex mAudioLock;
-    static std::shared_ptr<AudioManager> sInstance;
+    inline static SDL_AudioStream* sConversionStream;
-    static bool sMuteStream;
+    inline static std::vector<std::shared_ptr<Sound>> sSoundVector;
-    static bool sHasAudioDevice;
+    inline static bool sMuteStream = false;
-    static bool mIsClearingStream;
+    inline static bool sHasAudioDevice = true;
 };
 
 #endif // ES_CORE_AUDIO_MANAGER_H

es-core/src/Sound.cpp

@@ -15,8 +15,6 @@
 #include "ThemeData.h"
 #include "resources/ResourceManager.h"
 
-NavigationSounds* NavigationSounds::sInstance = nullptr;
-
 std::map<std::string, std::shared_ptr<Sound>> Sound::sMap;
 
 std::shared_ptr<Sound> Sound::get(const std::string& path)
@@ -26,16 +24,16 @@ std::shared_ptr<Sound> Sound::get(const std::string& path)
         return it->second;
 
     std::shared_ptr<Sound> sound = std::shared_ptr<Sound>(new Sound(path));
-    AudioManager::getInstance()->registerSound(sound);
+    AudioManager::getInstance().registerSound(sound);
     sMap[path] = sound;
     return sound;
 }
 
-std::shared_ptr<Sound> Sound::getFromTheme(const std::shared_ptr<ThemeData>& theme,
+std::shared_ptr<Sound> Sound::getFromTheme(ThemeData* const theme,
                                            const std::string& view,
                                            const std::string& element)
 {
-    if (!theme) {
+    if (theme == nullptr) {
         LOG(LogDebug) << "Sound::getFromTheme(): Using fallback sound file for \"" << element
                       << "\"";
         return get(ResourceManager::getInstance()->getResourcePath(":/sounds/" + element + ".wav"));
@@ -57,7 +55,7 @@ Sound::Sound(const std::string& path)
     : mSampleData(nullptr)
     , mSamplePos(0)
     , mSampleLength(0)
-    , playing(false)
+    , mPlaying(false)
 {
     loadFile(path);
 }
@@ -127,7 +125,7 @@ void Sound::init()
 
 void Sound::deinit()
 {
-    playing = false;
+    mPlaying = false;
 
     if (mSampleData != nullptr) {
         SDL_LockAudioDevice(AudioManager::sAudioDevice);
@@ -148,28 +146,28 @@ void Sound::play()
     if (!Settings::getInstance()->getBool("NavigationSounds"))
         return;
 
-    if (!AudioManager::getInstance()->getHasAudioDevice())
+    if (!AudioManager::getInstance().getHasAudioDevice())
         return;
 
     SDL_LockAudioDevice(AudioManager::sAudioDevice);
 
-    if (playing)
+    if (mPlaying)
         // Replay from start. rewind the sample to the beginning.
         mSamplePos = 0;
     else
         // Flag our sample as playing.
-        playing = true;
+        mPlaying = true;
 
     SDL_UnlockAudioDevice(AudioManager::sAudioDevice);
     // Tell the AudioManager to start playing samples.
-    AudioManager::getInstance()->play();
+    AudioManager::getInstance().play();
 }
 
 void Sound::stop()
 {
     // Flag our sample as not playing and rewind its position.
     SDL_LockAudioDevice(AudioManager::sAudioDevice);
-    playing = false;
+    mPlaying = false;
     mSamplePos = 0;
     SDL_UnlockAudioDevice(AudioManager::sAudioDevice);
 }
@@ -179,34 +177,27 @@ void Sound::setPosition(Uint32 newPosition)
     mSamplePos = newPosition;
     if (mSamplePos >= mSampleLength) {
         // Got to or beyond the end of the sample. stop playing.
-        playing = false;
+        mPlaying = false;
         mSamplePos = 0;
     }
 }
 
-NavigationSounds* NavigationSounds::getInstance()
+NavigationSounds& NavigationSounds::getInstance()
 {
-    if (sInstance == nullptr)
+    static NavigationSounds instance;
-        sInstance = new NavigationSounds();
+    return instance;
-
-    return sInstance;
 }
 
 void NavigationSounds::deinit()
 {
-    if (sInstance) {
+    for (auto sound : mNavigationSounds) {
-        for (auto sound : navigationSounds) {
+        AudioManager::getInstance().unregisterSound(sound);
-            AudioManager::getInstance()->unregisterSound(sound);
         sound->deinit();
     }
-        navigationSounds.clear();
+    mNavigationSounds.clear();
-        delete sInstance;
 }
 
-    sInstance = nullptr;
+void NavigationSounds::loadThemeNavigationSounds(ThemeData* const theme)
-}
-
-void NavigationSounds::loadThemeNavigationSounds(const std::shared_ptr<ThemeData>& theme)
 {
     if (theme) {
         LOG(LogDebug) << "NavigationSounds::loadThemeNavigationSounds(): "
@@ -218,21 +209,21 @@ void NavigationSounds::loadThemeNavigationSounds(const std::shared_ptr<ThemeData
                "Theme set does not include navigation sound support, using fallback sounds";
     }
 
-    navigationSounds.push_back(Sound::getFromTheme(theme, "all", "systembrowse"));
+    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "systembrowse"));
-    navigationSounds.push_back(Sound::getFromTheme(theme, "all", "quicksysselect"));
+    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "quicksysselect"));
-    navigationSounds.push_back(Sound::getFromTheme(theme, "all", "select"));
+    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "select"));
-    navigationSounds.push_back(Sound::getFromTheme(theme, "all", "back"));
+    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "back"));
-    navigationSounds.push_back(Sound::getFromTheme(theme, "all", "scroll"));
+    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "scroll"));
-    navigationSounds.push_back(Sound::getFromTheme(theme, "all", "favorite"));
+    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "favorite"));
-    navigationSounds.push_back(Sound::getFromTheme(theme, "all", "launch"));
+    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "launch"));
 }
 
 void NavigationSounds::playThemeNavigationSound(NavigationSoundsID soundID)
 {
-    NavigationSounds::getInstance()->navigationSounds[soundID]->play();
+    NavigationSounds::getInstance().mNavigationSounds[soundID]->play();
 }
 
 bool NavigationSounds::isPlayingThemeNavigationSound(NavigationSoundsID soundID)
 {
-    return NavigationSounds::getInstance()->navigationSounds[soundID]->isPlaying();
+    return NavigationSounds::getInstance().mNavigationSounds[soundID]->isPlaying();
 }

es-core/src/Sound.h

@@ -30,7 +30,7 @@ public:
     void loadFile(const std::string& path);
 
     void play();
-    bool isPlaying() const { return playing; }
+    bool isPlaying() const { return mPlaying; }
     void stop();
 
     const Uint8* getData() const { return mSampleData; }
@@ -39,7 +39,7 @@ public:
     Uint32 getLength() const { return mSampleLength; }
 
     static std::shared_ptr<Sound> get(const std::string& path);
-    static std::shared_ptr<Sound> getFromTheme(const std::shared_ptr<ThemeData>& theme,
+    static std::shared_ptr<Sound> getFromTheme(ThemeData* const theme,
                                                const std::string& view,
                                                const std::string& elem);
 
@@ -52,7 +52,7 @@ private:
     Uint8* mSampleData;
     Uint32 mSamplePos;
     Uint32 mSampleLength;
-    bool playing;
+    bool mPlaying;
 };
 
 enum NavigationSoundsID {
@@ -68,16 +68,15 @@ enum NavigationSoundsID {
 class NavigationSounds
 {
 public:
-    static NavigationSounds* getInstance();
+    static NavigationSounds& getInstance();
 
     void deinit();
-    void loadThemeNavigationSounds(const std::shared_ptr<ThemeData>& theme);
+    void loadThemeNavigationSounds(ThemeData* const theme);
     void playThemeNavigationSound(NavigationSoundsID soundID);
     bool isPlayingThemeNavigationSound(NavigationSoundsID soundID);
 
 private:
-    static NavigationSounds* sInstance;
+    std::vector<std::shared_ptr<Sound>> mNavigationSounds;
-    std::vector<std::shared_ptr<Sound>> navigationSounds;
 };
 
 #endif // ES_CORE_SOUND_H

es-core/src/Window.cpp

@@ -15,7 +15,6 @@
 #if defined(BUILD_VLC_PLAYER)
 #include "components/VideoVlcComponent.h"
 #endif
-#include "AudioManager.h"
 #include "InputManager.h"
 #include "Log.h"
 #include "Sound.h"
@@ -219,7 +218,7 @@ void Window::input(InputConfig* config, Input input)
                 else if (config->isMappedTo("y", input) && input.value != 0) {
                     // Jump to the game in its gamelist, but do not launch it.
                     stopScreensaver();
-                    NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+                    NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
                     mScreensaver->goToGame();
                     // To force handling the wake up process.
                     mSleeping = true;

es-core/src/components/TextListComponent.h

@@ -102,8 +102,8 @@ public:
 protected:
     virtual void onScroll() override
     {
-        if (!NavigationSounds::getInstance()->isPlayingThemeNavigationSound(SCROLLSOUND))
+        if (!NavigationSounds::getInstance().isPlayingThemeNavigationSound(SCROLLSOUND))
-            NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
+            NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
     }
     virtual void onCursorChanged(const CursorState& state) override;
 

es-core/src/components/VideoComponent.cpp

@@ -90,9 +90,12 @@ void VideoComponent::setImage(std::string path)
 
 void VideoComponent::onShow()
 {
+    std::unique_lock<std::mutex> playerLock(mPlayerMutex);
     mBlockPlayer = false;
     mPause = false;
     mShowing = true;
+    playerLock.unlock();
+
     manageState();
 }
 
@@ -110,22 +113,31 @@ void VideoComponent::onStopVideo()
 
 void VideoComponent::onPauseVideo()
 {
+    std::unique_lock<std::mutex> playerLock(mPlayerMutex);
     mBlockPlayer = true;
     mPause = true;
+    playerLock.unlock();
+
     manageState();
 }
 
 void VideoComponent::onUnpauseVideo()
 {
+    std::unique_lock<std::mutex> playerLock(mPlayerMutex);
     mBlockPlayer = false;
     mPause = false;
+    playerLock.unlock();
+
     manageState();
 }
 
 void VideoComponent::onScreensaverActivate()
 {
+    std::unique_lock<std::mutex> playerLock(mPlayerMutex);
     mBlockPlayer = true;
     mPause = true;
+    playerLock.unlock();
+
     if (Settings::getInstance()->getString("ScreensaverType") == "dim")
         stopVideo();
     else
@@ -158,15 +170,20 @@ void VideoComponent::onGameLaunchedDeactivate()
 void VideoComponent::topWindow(bool isTop)
 {
     if (isTop) {
+        std::unique_lock<std::mutex> playerLock(mPlayerMutex);
         mBlockPlayer = false;
         mPause = false;
+        playerLock.unlock();
+
         // Stop video when closing the menu to force a reload of the
         // static image (if the theme is configured as such).
         stopVideo();
     }
     else {
+        std::unique_lock<std::mutex> playerLock(mPlayerMutex);
         mBlockPlayer = true;
         mPause = true;
+        playerLock.unlock();
     }
     manageState();
 }

es-core/src/components/VideoComponent.h

@@ -12,6 +12,7 @@
 #include "GuiComponent.h"
 #include "components/ImageComponent.h"
 
+#include <mutex>
 #include <string>
 
 class MediaViewer;
@@ -109,6 +110,7 @@ private:
 protected:
     Window* mWindow;
     ImageComponent mStaticImage;
+    std::mutex mPlayerMutex;
 
     unsigned mVideoWidth;
     unsigned mVideoHeight;

es-core/src/components/VideoFFmpegComponent.cpp

@@ -130,7 +130,10 @@ void VideoFFmpegComponent::render(const glm::mat4& parentTrans)
 
     if (mIsPlaying && mFormatContext) {
         unsigned int color;
-        if (mDecodedFrame && mFadeIn < 1) {
+        std::unique_lock<std::mutex> pictureLock(mPictureMutex);
+        bool decodedFrame = mDecodedFrame;
+        pictureLock.unlock();
+        if (decodedFrame && mFadeIn < 1) {
             const unsigned int fadeIn = static_cast<int>(mFadeIn * 255.0f);
             color =
                 Renderer::convertRGBAToABGR((fadeIn << 24) | (fadeIn << 16) | (fadeIn << 8) | 255);
@@ -159,11 +162,13 @@ void VideoFFmpegComponent::render(const glm::mat4& parentTrans)
         for (int i = 0; i < 4; i++)
             vertices[i].pos = glm::round(vertices[i].pos);
 
-        // This is needed to avoid a slight gap before the video starts playing.
+        pictureLock.lock();
-        if (!mDecodedFrame)
-            return;
 
-        mPictureMutex.lock();
+        // This is needed to avoid a slight gap before the video starts playing.
+        if (!mDecodedFrame) {
+            pictureLock.unlock();
+            return;
+        }
 
         if (!mOutputPicture.hasBeenRendered) {
             // Move the contents of mOutputPicture to a temporary vector in order to call
@@ -188,7 +193,7 @@ void VideoFFmpegComponent::render(const glm::mat4& parentTrans)
                 mOutputPicture.hasBeenRendered = true;
             }
 
-            mPictureMutex.unlock();
+            pictureLock.unlock();
 
             if (pictureSize > 0) {
                 // Build a texture for the video frame.
@@ -196,7 +201,7 @@ void VideoFFmpegComponent::render(const glm::mat4& parentTrans)
             }
         }
         else {
-            mPictureMutex.unlock();
+            pictureLock.unlock();
         }
 
         mTexture->bind();
@@ -225,13 +230,12 @@ void VideoFFmpegComponent::updatePlayer()
         return;
 
     // Output any audio that has been added by the processing thread.
-    mAudioMutex.lock();
+    std::unique_lock<std::mutex> audioLock(mAudioMutex);
     if (mOutputAudio.size()) {
-        AudioManager::getInstance()->processStream(&mOutputAudio.at(0),
+        AudioManager::getInstance().processStream(&mOutputAudio.at(0),
                                                   static_cast<unsigned int>(mOutputAudio.size()));
         mOutputAudio.clear();
     }
-    mAudioMutex.unlock();
 
     if (mIsActuallyPlaying && mStartTimeAccumulation) {
         mAccumulatedTime +=
@@ -243,8 +247,10 @@ void VideoFFmpegComponent::updatePlayer()
 
     mTimeReference = std::chrono::high_resolution_clock::now();
 
+    audioLock.unlock();
+
     if (!mFrameProcessingThread) {
-        AudioManager::getInstance()->unmuteStream();
+        AudioManager::getInstance().unmuteStream();
         mFrameProcessingThread =
             std::make_unique<std::thread>(&VideoFFmpegComponent::frameProcessing, this);
     }
@@ -262,15 +268,19 @@ void VideoFFmpegComponent::frameProcessing()
     if (mAudioCodecContext)
         audioFilter = setupAudioFilters();
 
-    while (mIsPlaying && !mPause && videoFilter && (!mAudioCodecContext || audioFilter)) {
+    bool isPlaying = true;
+    bool pause = false;
+
+    while (isPlaying && !pause && videoFilter && (!mAudioCodecContext || audioFilter)) {
         readFrames();
-        if (!mIsPlaying)
-            break;
         getProcessedFrames();
-        if (!mIsPlaying)
-            break;
         outputFrames();
 
+        std::unique_lock<std::mutex> playerLock(mPlayerMutex);
+        isPlaying = mIsPlaying;
+        pause = mPause;
+        playerLock.unlock();
+
         // This 1 ms wait makes sure that the thread does not consume all available CPU cycles.
         SDL_Delay(1);
     }
@@ -428,7 +438,7 @@ bool VideoFFmpegComponent::setupAudioFilters()
 {
     int returnValue = 0;
     char errorMessage[512];
-    const int outSampleRates[] = {AudioManager::getInstance()->sAudioFormat.freq, -1};
+    const int outSampleRates[] = {AudioManager::getInstance().sAudioFormat.freq, -1};
     const enum AVSampleFormat outSampleFormats[] = {AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE};
 
     mAFilterInputs = avfilter_inout_alloc();
@@ -662,9 +672,11 @@ void VideoFFmpegComponent::readFrames()
         }
     }
 
-    if (readFrameReturn < 0)
+    if (readFrameReturn < 0) {
+        std::unique_lock<std::mutex> playerLock(mPlayerMutex);
         mEndOfVideo = true;
     }
+}
 
 void VideoFFmpegComponent::getProcessedFrames()
 {
@@ -739,6 +751,7 @@ void VideoFFmpegComponent::outputFrames()
     // there is an audio track.
     if (!mAudioCodecContext || (mAudioCodecContext && !mAudioFrameQueue.empty())) {
         if (!mStartTimeAccumulation) {
+            std::unique_lock<std::mutex> audioLock(mAudioMutex);
             mTimeReference = std::chrono::high_resolution_clock::now();
             mStartTimeAccumulation = true;
             mIsActuallyPlaying = true;
@@ -748,7 +761,11 @@ void VideoFFmpegComponent::outputFrames()
     // Process the audio frames that have a PTS value below mAccumulatedTime (plus a small
     // buffer to avoid underflows).
     while (!mAudioFrameQueue.empty()) {
-        if (mAudioFrameQueue.front().pts < mAccumulatedTime + AUDIO_BUFFER) {
+        std::unique_lock<std::mutex> audioLock(mAudioMutex);
+        auto accumulatedTime = mAccumulatedTime;
+        audioLock.unlock();
+
+        if (mAudioFrameQueue.front().pts < accumulatedTime + AUDIO_BUFFER) {
             // Enable only when needed, as this generates a lot of debug output.
             if (DEBUG_VIDEO) {
                 LOG(LogDebug) << "Processing audio frame with PTS: "
@@ -770,13 +787,13 @@ void VideoFFmpegComponent::outputFrames()
 
             if (outputSound) {
                 // The audio is output to AudioManager from updatePlayer() in the main thread.
-                mAudioMutex.lock();
+                audioLock.lock();
 
                 mOutputAudio.insert(mOutputAudio.end(),
                                     mAudioFrameQueue.front().resampledData.begin(),
                                     mAudioFrameQueue.front().resampledData.end());
 
-                mAudioMutex.unlock();
+                audioLock.unlock();
             }
             mAudioFrameQueue.pop();
             mAudioFrameCount++;
@@ -786,11 +803,19 @@ void VideoFFmpegComponent::outputFrames()
         }
     }
 
+    std::unique_lock<std::mutex> playerLock(mPlayerMutex);
+    bool isActuallyPlaying = mIsActuallyPlaying;
+    playerLock.unlock();
+
     // Process all available video frames that have a PTS value below mAccumulatedTime.
     // But if more than one frame is processed here, it means that the computer can't
     // keep up for some reason.
-    while (mIsActuallyPlaying && !mVideoFrameQueue.empty()) {
+    while (isActuallyPlaying && !mVideoFrameQueue.empty()) {
-        if (mVideoFrameQueue.front().pts < mAccumulatedTime) {
+        std::unique_lock<std::mutex> audioLock(mAudioMutex);
+        double accumulatedTime = mAccumulatedTime;
+        audioLock.unlock();
+
+        if (mVideoFrameQueue.front().pts < accumulatedTime) {
             // Enable only when needed, as this generates a lot of debug output.
             if (DEBUG_VIDEO) {
                 LOG(LogDebug) << "Processing video frame with PTS: "
@@ -808,7 +833,7 @@ void VideoFFmpegComponent::outputFrames()
                 }
             }
 
-            mPictureMutex.lock();
+            std::unique_lock<std::mutex> pictureLock(mPictureMutex);
 
             // Give some leeway for frames that have not yet been rendered but that have pts
             // values with a time difference relative to the frame duration that is under a
@@ -818,10 +843,10 @@ void VideoFFmpegComponent::outputFrames()
             // can't keep up. This approach primarily decreases stuttering for videos with frame
             // rates close to, or at, the rendering frame rate, for example 59.94 and 60 FPS.
             if (mDecodedFrame && !mOutputPicture.hasBeenRendered) {
-                double timeDifference = mAccumulatedTime - mVideoFrameQueue.front().pts -
+                double timeDifference = accumulatedTime - mVideoFrameQueue.front().pts -
                                         mVideoFrameQueue.front().frameDuration * 2.0l;
                 if (timeDifference < mVideoFrameQueue.front().frameDuration) {
-                    mPictureMutex.unlock();
+                    pictureLock.unlock();
                     break;
                 }
             }
@@ -835,12 +860,12 @@ void VideoFFmpegComponent::outputFrames()
             mOutputPicture.height = mVideoFrameQueue.front().height;
             mOutputPicture.hasBeenRendered = false;
 
-            mPictureMutex.unlock();
+            mDecodedFrame = true;
+
+            pictureLock.unlock();
 
             mVideoFrameQueue.pop();
             mVideoFrameCount++;
-
-            mDecodedFrame = true;
         }
         else {
             break;
@@ -1383,16 +1408,18 @@ void VideoFFmpegComponent::startVideo()
 
 void VideoFFmpegComponent::stopVideo()
 {
+    std::unique_lock<std::mutex> playerLock(mPlayerMutex);
     mIsPlaying = false;
     mIsActuallyPlaying = false;
     mStartDelayed = false;
     mPause = false;
     mEndOfVideo = false;
+    playerLock.unlock();
     mTexture.reset();
 
     if (mFrameProcessingThread) {
         if (mWindow->getVideoPlayerCount() == 0)
-            AudioManager::getInstance()->muteStream();
+            AudioManager::getInstance().muteStream();
         // Wait for the thread execution to complete.
         mFrameProcessingThread->join();
         mFrameProcessingThread.reset();
@@ -1404,7 +1431,7 @@ void VideoFFmpegComponent::stopVideo()
     std::queue<AudioFrame>().swap(mAudioFrameQueue);
 
     // Clear the audio buffer.
-    AudioManager::getInstance()->clearStream();
+    AudioManager::getInstance().clearStream();
 
     if (mFormatContext) {
         av_frame_free(&mVideoFrame);
@@ -1427,12 +1454,16 @@ void VideoFFmpegComponent::stopVideo()
 void VideoFFmpegComponent::pauseVideo()
 {
     if (mPause && mWindow->getVideoPlayerCount() == 0)
-        AudioManager::getInstance()->muteStream();
+        AudioManager::getInstance().muteStream();
 }
 
 void VideoFFmpegComponent::handleLooping()
 {
-    if (mIsPlaying && mEndOfVideo) {
+    std::unique_lock<std::mutex> playerLock(mPlayerMutex);
+    bool endOfVideo = mEndOfVideo;
+    playerLock.unlock();
+
+    if (mIsPlaying && endOfVideo) {
         // If the screensaver video swap time is set to 0, it means we should
         // skip to the next game when the video has finished playing.
         if (mScreensaverMode &&