C++ Mix_OpenAudio函数代码示例

bool Game::Init()
{
	// Initialize SDL
	if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0)
	{
		SDL_Log("Failed to initialize SDL.");
		return false;
	}
    
	// Initialize Renderer
	if (!mRenderer.Init(1024, 768))
	{
		SDL_Log("Failed to initialize renderer.");
		return false;
	}
    
    // Initialize SDL Mixer
    if(Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 2048))
    {
        SDL_Log("Failed to Initizlie SDL Mixer");
        return false;
    }

	// Initialize RNG
	Random::Init();

	// Start frame timer
	mTimer.Start();
    
    //Map all actions and inputs
    AddInputMappings();

	// Run any code at game start
	StartGame();

	return true;
}

void music_play (const char *file,
                 const char *alias,
                 uint32_t rate)
{
    int audio_format = MIX_DEFAULT_FORMAT;
    int audio_channels = 2;
    int audio_buffers = 4096;

    if (!music_init_done) {
        if (Mix_OpenAudio(rate,
                          audio_format,
                          audio_channels,
                          audio_buffers) != 0) {

            MSG_BOX("Mix_OpenAudio fail: %s %s",
                    Mix_GetError(), SDL_GetError());
            SDL_ClearError();
        }

        music_init_done = true;
    }

    musicp music = music_load(file, alias);

    music_update_volume();

    static int sound_loaded;
    if (!sound_loaded) {
        sound_loaded = true;
        sound_load_all();
    }

    if (Mix_FadeInMusicPos(music->music, -1, 2000, 0) == -1) {
//    if (Mix_PlayMusic(music->music, -1) == -1) {
        WARN("cannot play music %s: %s", music->tree.key, Mix_GetError());
    }
}

SoundManager::SoundManager(){
    cout << "Initializing sound Manager\n";


    if(Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2,1024)==-1) {
        printf("Mix_OpenAudio: %s\n", Mix_GetError());
        exit(2);
    } else {
        cout << "opened audio" << "\n";
        cout << "Allocated " << Mix_AllocateChannels(m_totalChannels);
        cout << " channels of audio\n";
        cout << "opened audio" << endl;
        cout << "Allocated " << Mix_AllocateChannels(m_totalChannels)
         << " channels of audio\n";
    }


    int flags=MIX_INIT_OGG;
    int initted = Mix_Init(flags);
    if((initted & flags) != flags) {
        printf("Mix_Init: Failed to init required ogg and mod support!\n");
        printf("Mix_Init: %s\n", Mix_GetError());
        // handle error
    } else {
        cout << "mix init success\n";
    }

    //Mix_VolumeMusic(100);
    Mix_Volume(0, 50);
    Mix_Volume(1, 50);
    Mix_Volume(2, 50);

    m_eventHandler.registerHandler();
    m_eventHandler.registerEvent("play_sound");
    m_eventHandler.registerEvent("play_song");
    m_eventHandler.registerEvent("song_volume");
}

void Splash::show(void)
{
    Mix_OpenAudio(22050, MIX_DEFAULT_FORMAT, 2, 4096);
    music = Mix_LoadMUS("data/muzika/music.wav");
    Mix_PlayMusic(music, -1);

    glClear(GL_COLOR_BUFFER_BIT);
    glPushMatrix();
    glOrtho(0, this->wWidth, 0, this->wHeight, -1, 1);

    // Begin render

    glColor4ub(255, 255, 255, 255); // White color
    glBegin(GL_QUADS);
        glVertex2f(0, 0);
        glVertex2f(this->wWidth, 0);
        glVertex2f(this->wWidth, this->wHeight);
        glVertex2f(0, wHeight);
    glEnd();

    glEnable(GL_TEXTURE_2D);
    glBindTexture(GL_TEXTURE_2D, this->texture);
    glBegin(GL_QUADS);
        glTexCoord2d(0, 1); glVertex2f(this->x, this->y);
        glTexCoord2d(1, 1); glVertex2f(this->x + this->width, this->y);
        glTexCoord2d(1, 0); glVertex2f(this->x + this->width, this->y + this->height);
        glTexCoord2d(0, 0); glVertex2f(this->x, this->y + this->height);
    glEnd();
    glDisable(GL_TEXTURE_2D);

    // End render

    glPopMatrix();
    SDL_GL_SwapBuffers();
    SDL_Delay(time);
    Mix_FreeMusic(music);
}

main(int argc, char *argv[]) {
  /* Initialize the SDL library */
  if (SDL_Init(SDL_INIT_AUDIO) < 0) {
    fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
    exit(2);
  }
  atexit(SDL_Quit);

  /* Open the audio device */
  if (Mix_OpenAudio(8000, AUDIO_U8, 1, 512) < 0) {
    fprintf(stderr,"Mix_OpenAudio: %s\n", Mix_GetError());
  }

  if (loadSounds()) {
    while (1) {
      playSound();
    }
    
    freeSounds();
  }

  Mix_CloseAudio();
  exit(0);
}

/*------------------------------------------------------------------------------------------------------------------
--       FUNCTION: 		    	init_everything
--
--       DATE:                  April 15, 2009
--
--       DESIGNER:              Alin Albu
--
--       PROGRAMMER: 		    Alin Albu
--
--       INTERFACE:                 bool init_everything(SDL_Surface* screen)
--
--	 RETURNS:		    true if SDLinitialization succeeds, false otherwise
--
--       NOTES:
--       initialises the libraries, as well as the screen and sets screen size and window caption.
----------------------------------------------------------------------------------------------------------------------*/
bool init_everything(SDL_Surface **screen) {
	printf("Init everything Started");
	//Initialize all SDL subsystems
	if (SDL_Init(SDL_INIT_EVERYTHING) == -1) {
		printf("Init everything Failed\n");
		return false;
	}
	printf("...");
	//Set up the screen
	*screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, 32, SDL_DOUBLEBUF);
	//If there was an error in setting up the screen
	if (*screen == NULL) {
		printf("Init SCREEN Failed\n");
		return false;
	}
	printf("...");
	//Initialize SDL_ttf
	if (TTF_Init() == -1) {
		printf("Init TTF Failed\n");
		return false;
	}
	printf("...");
	//Initialize SDL_mixer
	if (Mix_OpenAudio(22050, MIX_DEFAULT_FORMAT, 2, 4096) == -1) {
		printf("Init AUDIO Failed\n");
		return false;
	}
	printf("...");
	//Set the window caption
	SDL_WM_SetCaption("Tux Bomber", NULL);
	printf("...");
	SDL_ShowCursor(SDL_ENABLE);
	//If everything initialized fine
	printf("Init everything Done\n");
	return true;
}

bool JukeBox::OpenDevice()
{
  if (m_init)
    return true;
  Config* cfg = Config::GetInstance();
  if (!cfg->GetSoundEffects() && !cfg->GetSoundMusic()) {
    End();
    return false;
  }

  /* Initialize the SDL library */
  if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
    std::cerr << "* Couldn't initialize SDL: "<< SDL_GetError() << std::endl;
    return false;
  }
  m_init = true;

  Uint16 audio_format = MIX_DEFAULT_FORMAT;
  int audio_buffer = 1024;

  /* Open the audio device */
  if (Mix_OpenAudio(cfg->GetSoundFrequency(), audio_format, channels, audio_buffer) < 0) {
    std::cerr << "* Couldn't open audio: " <<  SDL_GetError() << std::endl;
    End();
    return false;
  } else {
    int frequency;
    Mix_QuerySpec(&frequency, &audio_format, &channels);
    std::cout << Format(_("o Opened audio at %d Hz %d bit"),
                        frequency, (audio_format&0xFF)) << std::endl;
    cfg->SetSoundFrequency(frequency);
  }
  Mix_ChannelFinished(JukeBox::EndChunk);
  Mix_HookMusicFinished(JukeBox::EndMusic);
  return true;
}

//---------------------------------------------------------------------------
bool BaseApplication::setup(void)
{
    mRoot = new Ogre::Root(mPluginsCfg);

    setupResources();

    bool carryOn = configure();
    if (!carryOn) return false;

    chooseSceneManager();
    createCamera();
    createViewports();

    // Set default mipmap level (NB some APIs ignore this)
    Ogre::TextureManager::getSingleton().setDefaultNumMipmaps(5);

    // Create any resource listeners (for loading screens)
    createResourceListener();
    // Load resources
    loadResources();

    // Create the scene
    createScene();

    createFrameListener();

    SDL_Init(SDL_INIT_EVERYTHING);
    Mix_OpenAudio(22050,MIX_DEFAULT_FORMAT,2,4096);
    music = Mix_LoadMUS("game_music.mp3");
    Mix_PlayMusic(music,-1);
    Mix_Volume(-1, 40);

    createGUI();

    return true;
};

bool init()
{
    //Initialize all SDL subsystems
    if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 )
    {
        return false;
    }

    //Set up the screen
    screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );

    //If there was an error in setting up the screen
    if( screen == NULL )
    {
        return false;
    }

    //Initialize SDL_ttf
    if( TTF_Init() == -1 )
    {
        return false;
    }


    //Iniciando SDL_Mixer
    if( Mix_OpenAudio( 22050, MIX_DEFAULT_FORMAT, 2, 4096 ) == -1 )
    {
        return false;
    }

    //Set the window caption
    SDL_WM_SetCaption( "Press an Arrow Key", NULL );

    //If everything initialized fine
    return true;
}

  CSDL2Renderer::CSDL2Renderer() {

    if ( SDL_Init( SDL_INIT_EVERYTHING ) != 0 ) {
      std::cout << "Something went wrong: " << SDL_GetError() << std::endl;
    }
    IMG_Init(IMG_INIT_PNG);
    mWindow = SDL_CreateWindow( "BlockyFalls",
                               SDL_WINDOWPOS_CENTERED,
                               SDL_WINDOWPOS_CENTERED,
                               640,
                               480,
                               SDL_WINDOW_SHOWN );

    if ( mWindow == nullptr ) {
      std::cout << "Could not create a Window.";
      std::cout << SDL_GetError() << std::endl;
      SDL_Quit();
      return;
    }

    mRenderer = SDL_CreateRenderer( mWindow, -1, 0 );

    if ( mRenderer == nullptr ) {
      std::cout << "Could not create renderer: ";
      std::cout << SDL_GetError() << std::endl;
      SDL_Quit();
      return;
    }


    TTF_Init();

    if ( Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 1024) == -1 ) {
      std::cout << "coudlnt init mixer" << std::endl;
    }
  }

         InitAndQuit(bool shadersOn)
         {
            if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER) != 0)
            {
               std::ostringstream error;
               error << "Failed on SDL_Init: " << SDL_GetError() << "\n";
               throw std::runtime_error(error.str());
            }
            graphics::setupGraphics(shadersOn);
            SDL_WM_SetCaption("Sousaphone Hero", "Sousaphone Hero");
            if(Mix_OpenAudio(AUDIO_RATE, AUDIO_FORMAT, AUDIO_CHANNELS, AUDIO_BUFFERS) != 0)
            {
               SDL_Quit();
               std::ostringstream error;
               error << "Failed on Mix_OpenAudio: " << Mix_GetError() << "\n";
               throw std::runtime_error(error.str());
            }

            std::srand(time(NULL));

            Mix_ChannelFinished(doChangedNotes); // set callback function

            startTiming();
         }

void Window::initialize()
{
	showDebugInfo();

    fprintf(stdout, "Initializing SDL system\r\n");
    if(SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO|SDL_INIT_TIMER) != 0)
    {
        fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError());
        exit(1);
    }

    fprintf(stdout, "Initializing font system\r\n");
    if(TTF_Init() == -1)
    {
        fprintf(stderr, "Unable to init SDL_ttf: %s\n", TTF_GetError());
        exit(2);
    }
    fprintf(stdout, "Initializing audio system\r\n");
    if (Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 4096) < 0)
    {
    	fprintf(stderr, "Unable to open audio channel: %s\n", Mix_GetError());
        exit(3);
    }
}

Audio::Audio(const std::string& name) : System(name) {
	
	sound_count = 0;
	music_count = 0;
	
	if (SDL_Init(SDL_INIT_AUDIO) != 0) {
		std::cerr << "ERROR: Failed to initialize SDL AUDIO!" << std::endl;
		std::cerr << SDL_GetError() << std::endl;
		return;
	}
	
	atexit(SDL_Quit);
	
	#define AUDIO_RATE      ((int)22050)
	#define AUDIO_FORMAT    ((unsigned short)AUDIO_S16)
	#define AUDIO_CHANNELS  ((int)2)
	#define AUDIO_BUFFERS   ((int)4096)
	
	if(Mix_OpenAudio(AUDIO_RATE, AUDIO_FORMAT, AUDIO_CHANNELS, AUDIO_BUFFERS)) {
		std::cerr << "ERROR: Failed to open SDL AUDIO!" << std::endl;
		std::cerr << SDL_GetError() << std::endl;
		return;
	}
}

void SoundManager::sound_init()
{
    Larp::CustomConfigurationLoader* config = Larp::CustomConfigurationLoader::load_configurations("sound.cfg");
    _music_volume = std::stof(config->get_configuration("music_volume"));
    _effect_volume = std::stof(config->get_configuration("sound_volume"));

    SDL_Init(SDL_INIT_EVERYTHING);

    srand(time(NULL));

    Mix_OpenAudio(MIX_DEFAULT_FREQUENCY, MIX_DEFAULT_FORMAT, 2, 4096);

    /*Load sound effects here */
    _background_music = Mix_LoadMUS("assets/sound/Neotantra.mp3");
    _sound_effects.emplace("shotgun", Mix_LoadWAV("assets/sound/shotgun.wav"));
    _sound_effects.emplace("rocket_fire", Mix_LoadWAV("assets/sound/rocket_fire.wav"));
    _sound_effects.emplace("chaingun", Mix_LoadWAV("assets/sound/chaingun.wav"));
    _sound_effects.emplace("jump", Mix_LoadWAV("assets/sound/jump.wav"));
    _sound_effects.emplace("walk0", Mix_LoadWAV("assets/sound/walking0.wav"));
    _sound_effects.emplace("walk1", Mix_LoadWAV("assets/sound/walking1.wav"));

    Mix_VolumeMusic(MIX_MAX_VOLUME * _music_volume);
    Mix_Volume(-1, MIX_MAX_VOLUME * _effect_volume);
}

bool init() {

	//Init video, audio
	if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0) {
		printf("SDL could not initialize Video or Audio! Error: %s\n", SDL_GetError());
		return false;
	}

	//Init image loader
	if (IMG_Init(IMG_INIT_PNG) != IMG_INIT_PNG) {
		printf("SDL could not initialize Image loader! Error: %s\n", IMG_GetError());
		return false;
	}

	//Init SDL_mixer
	if (Mix_OpenAudio(HIGH_FREQUENCY, MIX_DEFAULT_FORMAT, STEREO, CHUNKS) < 0) {
		printf("SDL_Mixer could not initialze! Error: %s\n", Mix_GetError());
		return false;
	}

	window = SDL_CreateWindow("Sound effect", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, SDL_WINDOW_SHOWN);
	if (window == NULL) {
		printf("SDL_Window could not be created! Error: %s\n", SDL_GetError());
		return false;
	}

	renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
	if (renderer == NULL) {
		printf("Renderer could not be created! Error: %s\n", SDL_GetError());
		return false;
	}

	texture = new MyTexture(renderer);

	return true;
}