android - 设置Cocos2d-X Simple Audio Engine音量时遇到问题？

Question

我正在Marmalade SDK 7.8.0之上使用Cocos2d-X 2.2.6开发游戏，但在设置Cocos Denshion简单音频引擎的声音效果音量时遇到一些问题。

我的代码是这样的:

void AudioHelper::init()
{
    s3eResult result;

    context = GameContext::getInstance();
    s3eSoundSetInt(S3E_SOUND_DEFAULT_FREQ, 44100);

    audioEngine = SimpleAudioEngine::sharedEngine();

    preloadSoundEffects();

    setVolume(context->getSoundVolume());
}

void AudioHelper::preloadSoundEffects()
{
    unsigned int i;
    CCArray *keysArray;
    CCString *key;
    const CCString *sound;

    keysArray = soundEffects->allKeys();

    for (i = 0; i < keysArray->count(); i++)
    {
        key = (CCString *) keysArray->objectAtIndex(i);
        sound = soundEffects->valueForKey(key->getCString());

        audioEngine->preloadEffect(sound->getCString());
    }
}

void AudioHelper::setVolume(int volumeLevel)
{
    float volume;

    // Note: there are 6 volume levels in my game, they go from 
    // 0 (max volume) to 5 (no sound).
    volume = 1 - volumeLevel / 5.0;

    audioEngine->setEffectsVolume(volume);
}

void AudioHelper::playSoundEffect(const char *effectKey)
{
    const CCString *sound;
    int volume;

    sound = soundEffects->valueForKey(effectKey);

    if (sound != NULL)
        audioEngine->playEffect(sound->getCString());

}

问题是，当我调用setVolume方法时，除非将音量级别参数设置为5(无声音)，否则声音效果的音量不会改变。发生这种情况时，不会播放声音(按预期)。

我做错了什么？

Answer 1

您是否在此代码中记录了实际值？

void AudioHelper::setVolume(int volumeLevel)
{
    float volume;

    // Note: there are 6 volume levels in my game, they go from 
    // 0 (max volume) to 5 (no sound).
    volume = 1 - volumeLevel / 5.0;

    audioEngine->setEffectsVolume(volume);
}

您不能以这种方式混合使用float和int计算。此处的 float volume始终为1或0，因为您将 volumeLevel用作int类型。您的代码应如下所示:

void AudioHelper::setVolume(int volumeLevel)
{
    float volume;

    // Note: there are 6 volume levels in my game, they go from 
    // 0 (max volume) to 5 (no sound).
    volume = 1.0f - (float)volumeLevel / 5.0f;

    audioEngine->setEffectsVolume(volume);
}

还应考虑到在win平台上使用CocosDenshion有一些限制(那里的音量没有变化)。