My SDL program won't sound!

[@nders]

I can't understand why my program doesn't sound anything. I think it should work because I've almost copied the code from here. As you can se I use SDL Mixer.

#include "SDL.h"
#include "SDL_mixer.h"

bool init();
bool load_files();
void clean_up();

Mix_Music   *music  = NULL;
SDL_Surface *screen = NULL;
SDL_Event event;

int main(int argc, char *argv[])
{
    bool quit = false;
    
    if (init() == false)
        return 1;
    if (load_files() == false)
        return 1;
    
    while (quit == false)
    {
        while (SDL_PollEvent(&event))
        {
            if (event.type == SDL_KEYDOWN) {
                if (event.key.keysym.sym == SDLK_SPACE) {
                    if (Mix_PlayingMusic == 0) {
                        if (Mix_PlayMusic(music, -1) == -1)
                            return 1;
                    } else {
                        if (Mix_PausedMusic() == 1)
                            Mix_ResumeMusic();
                        else
                            Mix_PauseMusic();
                    }
                } else if (event.key.keysym.sym == SDLK_ESCAPE) {
                    Mix_HaltMusic();
                }
            } else if (event.type == SDL_QUIT) {
                quit = true;
            }
        }
    }
    
    clean_up();
    return 0;
}

bool init()
{
    if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO) == -1)
        return false;
        
    screen = SDL_SetVideoMode(320, 240, 0, 0);
    
    if (screen == NULL)
        return false;
        
    if (Mix_OpenAudio(22050, MIX_DEFAULT_FORMAT, 2, 4096) == -1)
        return false;
        
    SDL_WM_SetCaption("Musicplayer", NULL);
    
    return true;
}

bool load_files()
{
    music = Mix_LoadMUS("test.mp3");
    
    if (music == NULL)
        return false;
        
    return true;
}

void clean_up()
{
    Mix_FreeMusic(music);
    Mix_CloseAudio();
    SDL_Quit();
}

[DougDbug]

I don't know anything about this particular library.... but this stuff is tricky!

Do they include any diagnostic code-samples? It's kind of hard to narrow-down the problem if the program simply doesn't seem to do anything...

Have you tried it with a WAV file? Are you decoding the MP3? (I didn't notice a reference to a codec in your code, but I might have missed it.)

You need to make sure you've "made a connection" with your soundcard/soundship's driver too. If you have a soundcard and a motherboard-soundchip, you might be sending the sound to the wrong one.

If you're running Windows, you might consider using DirectSound. It's a lot easier to get help with the more-popular libraries. It's a lot easier to find reference material too... not easy... just easier.

[@nders]

I've tested with mp3, ogg vorbis and wave files. When I use mp3 and ogg the result is the same; nothing happens, and when I test with a wave file the Mix_LoadMUS() function returns NULL (which leads to that the load_files() function returns false and the program shuts down).

I'm running Windows.

[DougDbug]

OK, one more guess... Maybe it can't find the file... It looks a little weird that you didn't tell the program what folder it's in.

Try moving the file to the root directory. Then, specify the full path like this:

music = Mix_LoadMUS("C:\\test.wav"); \\ I think you need 2 backslashes because it's an escape character.

A WAV file should be the eaisest, because it's not encoded. A wave file is essentially an array of individual samples. You can simply "connect the dots" to re-construct the waveform. I assume the SDL library will automatically read the WAV file-header to get the sample rate and bit depth, and then put the sample-data into an array or buffer.

[@nders]

Still the same. Mix_LoadMUS() returns NULL.

Edit: With Mix_GetError() I get Module format not recognized when trying to load a mp3 file and Unable to load WAV file when trying to load a wav.

Edit #2: I think I've solved it now. The reason it wouldn't play no matter which format is that I forgot parenthesis on line 30.
Now it plays Wave and Ogg vorbis, but unfortunately not mp3.