Added audio

Author: CodenameLambda

CMakeLists.txt

@@ -20,6 +20,7 @@ add_library (ObjSDL
     controller_event.cc controller_event.hh
     touch_event.cc touch_event.hh
     various_events.cc various_events.hh
+    audio.cc audio.hh
 )
 
 include (cmake/FindSDL2.cmake)

audio.cc

@@ -0,0 +1,76 @@
+#include "audio.hh"
+
+
+namespace SDL {
+    Audio::Audio(
+        const SDL_AudioSpec audio_spec,
+        Uint8* audio_buffer,
+        const Uint32 audio_length,
+        std::function<void(Uint8*)> free,
+        unsigned char volume
+    ) {
+        this->audio_spec = audio_spec;
+        this->audio_buffer = audio_buffer;
+        this->audio_length = audio_length;
+        this->free = free;
+        this->volume = volume;
+        // TODO: Callback
+    }
+
+    AudioInstance Audio::play(const bool start_automatically) {
+        return AudioInstance(*this, 1, start_automatically);
+    }
+
+    AudioInstance Audio::loop(const size_t times, const bool start_automatically) {
+        return AudioInstance(*this, times, start_automatically);
+    }
+
+    AudioInstance Audio::loop(const bool start_automatically) {
+        return AudioInstance(*this, 0, start_automatically);
+    }
+
+    Audio Audio::load_wav(const std::string file) {
+        SDL_AudioSpec audio_spec;
+        Uint8* audio_buffer;
+        Uint32 audio_length;
+        SDL_LoadWAV(file.c_str(), &audio_spec, &audio_buffer, &audio_length);
+        return Audio(audio_spec, audio_buffer, audio_length, SDL_FreeWAV);
+    }
+
+    Audio::~Audio() {
+        this->free(this->audio_buffer);
+    }
+
+    void AudioInstance::new_device() {
+        this->device = SDL_OpenAudioDevice(
+            NULL,
+            0,
+            &this->source.audio_spec,
+            NULL,
+            SDL_AUDIO_ALLOW_FORMAT_CHANGE
+        );
+    }
+
+    AudioInstance::AudioInstance(Audio& audio, const size_t loop, const bool start)
+    : source(audio) {
+        this->loop = loop;
+        this->new_device();
+        if (start)
+            this->play();
+        else
+            this->pause();
+    }
+
+    void AudioInstance::pause() {
+        SDL_PauseAudioDevice(this->device, 1);
+    }
+
+    void AudioInstance::stop() {
+        SDL_CloseAudioDevice(this->device);
+        this->new_device();
+    }
+
+    void AudioInstance::play() {
+        SDL_PauseAudioDevice(this->device, 0);
+    }
+}

audio.hh

@@ -0,0 +1,51 @@
+#include <SDL.h>
+#include <functional>
+
+
+namespace SDL {
+    class AudioInstance;
+
+    class Audio {
+        bool paused;
+        SDL_AudioSpec audio_spec;
+        Uint8* audio_buffer;
+        Uint32 audio_length;
+        std::function<void(Uint8*)> free;
+
+        public:
+        unsigned char volume;
+
+        Audio(
+            const SDL_AudioSpec audio_spec,
+            Uint8* audio_buffer,
+            const Uint32 audio_length,
+            std::function<void(Uint8*)> free,
+            unsigned char volume=SDL_MIX_MAXVOLUME  // 0 - 128
+        );
+
+        AudioInstance play(const bool start_automatically=true);
+        AudioInstance loop(const size_t times, const bool start_automatically=true);
+        AudioInstance loop(const bool start_automatically=true);
+
+        static Audio load_wav(const std::string file);
+
+        ~Audio();
+
+        friend class AudioInstance;
+    };
+
+    class AudioInstance {
+        Audio& source;
+        size_t loop;
+        SDL_AudioDeviceID device;
+
+        void new_device();
+
+        public:
+        AudioInstance(Audio&, const size_t loop, const bool start_automatically=true);
+
+        void pause();
+        void stop();
+        void play();
+    };
+}