SdlAudioModule.hpp

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#ifndef SDLAUDIO_MODULE_HPP
#define SDLAUDIO_MODULE_HPP
 
#include "IAudioModule.hpp"
 
#include "audio/SdlMusic.hpp"
#include "audio/SdlSound.hpp"
#include "audio/SdlSoundBuffer.hpp"
 
#include <SDL.h>
#include <SDL_mixer.h>
 
class SdlAudioModule : public IAudioModule {
 
public:
    SdlAudioModule() = default;
    ~SdlAudioModule() { stop(); }
 
    const char *type() const override { return IAudioModule::contract; }
    const char *name() const override { return "sdl2"; }
 
    // music
    audio::IMusic *createMusic(std::string path) override {
        if (!start())
            return nullptr;
        _opened++;
        return new SdlMusic(path);
    }
    void deleteMusic(audio::IMusic *music) override { drop(music); }
 
    // sound buffer
    audio::ISoundBuffer *createSoundBuffer(std::string path) override {
        if (!start())
            return nullptr;
        _opened++;
        return new SdlSoundBuffer(path);
    }
    void deleteSoundBuffer(audio::ISoundBuffer *buffer) override { drop(buffer); }
 
    // sound
    audio::ISound *createSound(audio::ISoundBuffer *buffer) override {
        if (!buffer)
            return nullptr;
        _opened++;
        return new SdlSound(*static_cast<SdlSoundBuffer *>(buffer));
    }
    void deleteSound(audio::ISound *sound) override { drop(sound); }
 
private:
    bool start() {
        if (_started)
            return true;
        if (SDL_InitSubSystem(SDL_INIT_AUDIO) != 0)
            return false;
        if (Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 2048) != 0) {
            SDL_QuitSubSystem(SDL_INIT_AUDIO);
            return false;
        }
        _started = true;
        return true;
    }
 
    void stop() {
        if (!_started)
            return;
        Mix_CloseAudio();
        SDL_QuitSubSystem(SDL_INIT_AUDIO);
        _started = false;
    }
 
    template <typename T>
    void drop(T *object) {
        if (!object)
            return;
        delete object;
        if (_opened > 0)
            _opened--;
        if (_opened == 0)
            stop();
    }
 
    unsigned _opened = 0;
    bool _started = false;
};
 
#endif /* !SDLAUDIO_MODULE_HPP */