C语言 SDL_Mixer不处理部分代码

Question

我只是有一个奇怪的问题。我想在我的游戏中加入声音。这是一个分为两个阶段的游戏。一个是角色扮演游戏，一个是战斗。在RPG中，当你走在怪物上时，你可以发起战斗。在我的代码中，我使用 3 次SDL_mixer来播放音乐（在菜单、RPG 和战斗中）。它在前两种情况下有效，但是当我发起战斗时，没有音乐。音乐加载完毕，Mix_playingMusic返回 true，但发起战斗时我听不到任何音乐。我使用与RPG和菜单中相同的音乐。关于SDL_Mixer的代码在任何地方都是一样的。战斗代码的一部分：

{
SDL_Event events;
Mix_Music *fightMusic;
enum actual_player actual = PLAYER;
int go = 1;
int action;
int monsterId = 0;
Uint32  t = SDL_GetTicks(), nt;
fightMusic = Mix_LoadMUS("data/Music/rpg.mp3"); // we loading the music
if(fightMusic == NULL){
    printf("error loading fightMusicn");
}
Mix_VolumeMusic(MIX_MAX_VOLUME);
if(Mix_PlayMusic(fightMusic, -1)<0){
    printf("error playing fightMusic n");
}
if (Mix_PlayingMusic() ){
    printf("Music it's playing n");
}
while(go){
    if(isFinished(fightSdl->fight))
        go = 0;
    nt = SDL_GetTicks();

    while (SDL_PollEvent(&events)){
        action = inputKeyboard(events);
        if(action == QUIT){
            return -1;
            go = 0;
        }
        if(action == -2){
            clearBufferGame(fightSdl->buffer, CHARACTER);
        }
        if(actual == PLAYER) {
            switch(action){
                case MOVE_DOWNWARD:                 
                    addActionToBufferGame(fightSdl->buffer, DOWN);
                break;
                case MOVE_UPWARD:
                    addActionToBufferGame(fightSdl->buffer, UP);
                break;
                case MOVE_LEFT:
                    addActionToBufferGame(fightSdl->buffer, LEFT);
                break;
                case MOVE_RIGHT:
                    addActionToBufferGame(fightSdl->buffer, RIGHT);
                break;
                case ATTACK_1:
                    actionAttackSdl(fightSdl, ATTACK_1);
                break;
                case ATTACK_2:
                    if(Mix_PlayChannel(-1,fireSound,0)<0){
                            printf("error playing fire sound");
                        }
                    actionAttackSdl(fightSdl, ATTACK_2);
                break;
                case ATTACK_3:
                    actionAttackSdl(fightSdl, ATTACK_3);
                break;
                case NOTHING:
                    actual = ENNEMY;
                break;
                case -1:
                    setIsIdleCharacSdl(fightSdl->characSdl,1);
            }   
        }           
    }
    if (nt-t>300){
        if(actual == ENNEMY){
            hitNRunSdl(fightSdl, monsterId);
            if(getMpEnnemyFight(fightSdl->fight) == 3 && getMpEnnemyFight(fightSdl->fight) == 3)
                monsterId++;
            if(monsterId >= fightSdl->nbMstrSdl){
                actual = PLAYER;
                setApPlayerFight(fightSdl->fight, 3);
                setMpPlayerFight(fightSdl->fight, 3);
                monsterId = 0;
            }
        }
        t = nt;
    }

    // updatePlayerDisplay(fightSdl);
    // updateMonsterDisplay(fightSdl);
    updatePlayerActionFight(fightSdl);
    updateSpellDisplay(fightSdl);
    updateDisplay(fightSdl);
    drawGame(fightSdl);
    // SDL_RenderPresent(fightSdl->renderer);
}
if(getLifePointsCharacter(getCharacterFight(fightSdl->fight)) >= 0)
    return 1;
return 0;

}

编辑：我添加了一个printf("%s", Mix_GetError)，菜单和RPG中没有错误，但在战斗中打印：无效的音频设备ID

Answer 1

所以，我找到了解决我问题的解决方案。显然，SDL_OpenAudio的返回值始终是成功或失败，而不是设备 ID，这意味着使用此函数一次只能打开一个设备。我只是在发起战斗时重新操作之前关闭了音频，它有效。