SoundStage.c

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/*
 * ObjectivelyMVC: Object oriented MVC framework for OpenGL, SDL2 and GNU C.
 * Copyright (C) 2014 Jay Dolan <jay@jaydolan.com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#include <assert.h>
 
#include <SDL2/SDL_mixer.h>
 
#include "clack.wav.h"
#include "click.wav.h"
 
#include "Log.h"
#include "SoundStage.h"
#include "WindowController.h"
 
#define _Class _SoundStage
 
#pragma mark - Object
 
static void dealloc(Object *self) {
 
    Mix_CloseAudio();
 
    super(Object, self, dealloc);
}
 
#pragma mark - SoundStage
 
static SoundStage *init(SoundStage *self) {
 
    self = (SoundStage *) super(Object, self, init);
    if (self) {
 
        if (Mix_OpenAudioDevice(48000, AUDIO_S16SYS, 2, 2048, NULL, SDL_AUDIO_ALLOW_ANY_CHANGE) == 0) {
            MVC_LogInfo("Opened audio device for playback\n");
        } else {
            MVC_LogError("Failed to open audio device: %s\n", SDL_GetError());
            self = release(self);
        }
    }
 
    return self;
}
 
static void play(const SoundStage *self, const Sound *sound) {
    static unsigned int ch;
 
    assert(sound);
 
    Mix_PlayChannel(ch++ % MIX_CHANNELS, sound->chunk, 0);
}
 
#pragma mark - Class lifecycle
 
Sound *_click;
Sound *_clack;
 
static void initialize(Class *clazz) {
 
    ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
 
    ((SoundStageInterface *) clazz->interface)->init = init;
    ((SoundStageInterface *) clazz->interface)->play = play;
 
    const int init = Mix_Init(0xff);
    assert(init);
 
    _click = $$(Sound, soundWithBytes, click_wav, click_wav_len);
    _clack = $$(Sound, soundWithBytes, clack_wav, clack_wav_len);
}
 
static void destroy(Class *clazz) {
 
    release(_click);
    release(_clack);
 
    Mix_Quit();
}
 
Class *_SoundStage(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "SoundStage",
            .superclass = _Object(),
            .instanceSize = sizeof(SoundStage),
            .interfaceOffset = offsetof(SoundStage, interface),
            .interfaceSize = sizeof(SoundStageInterface),
            .initialize = initialize,
            .destroy = destroy,
        });
    });
 
    return clazz;
}
 
#undef _Class
 
OBJECTIVELYMVC_EXPORT void MVC_PlaySound(const Sound *sound) {
 
    SDL_Window *window = SDL_GL_GetCurrentWindow();
    assert(window);
 
    WindowController *windowController = $$(WindowController, windowController, window);
    assert(windowController);
    assert(windowController->soundStage);
 
    $(windowController->soundStage, play, sound);
}