cocos2d-iphone - iOS的ObjectAL/OpenAL-运行时停止/暂停/静音？

Question

这是ObjectAL / OpenAL iOS文档:

http://kstenerud.github.io/ObjectAL-for-iPhone/documentation/index.html#use_objectal_sec

在世界上，如何在运行时简单地停止/暂停/静音某个声音(不是所有声音)？

我试过使用OALSimpleAudio，OpenAL对象和OALAudioTrack都没有运气。

我正在使用cocos2d v3。

Answer 1

您可以遵循ObjectAL demos中提供的示例，例如SingleSourceDemo。

其中一个是@ LearnCocos2D在他的评论中建议的ALSource。我将在这里尝试解释。
首先，您应该具有音频引擎-假设它是OALSimpleAudio。此外，假设您不想将其用于播放效果-它们将由单独的ALSources管理:

    ALSource* effectSource;
    ALBuffer* effectBuffer; //this is for the effect buffer

    //don't reserve source for OALSimpleAudio 
    [OALSimpleAudio sharedInstance].reservedSources = 0;

    //create the source for the effect.
    source = [ALSource source]; 

    //buffer the source file. 
    buffer = [[OpenALManager sharedInstance] bufferFromFile:@"audiofile.caf"]; 

现在，您可以使用以下方法播放/暂停/播放音高:

    [source play:buffer loop:YES]; //play sound from buffer and loop
    [source stop]; //stop 
    [source rewind]; //rewind sound to the beggining 
    [source fadeTo:0.0f duration:1.0f target:self selector:@selector(onFadeComplete:)]; //fade effect from source
    [source pitchTo:0.0f duration:1.0f target:self selector:@selector(onFadeComplete:)]; //pitch effect from source

等。希望这会有所帮助。