当声音做过的OpenAL打入门通知 [英] Getting notified when a sound is done playing in OpenAL

问题描述

我使用iPhone上的OpenAL可以同时播放多个音频样本。

I'm using OpenAL on iPhone to play multiple audio samples simultaneously.

我可以当单个样品做打的OpenAL来通知我？

Can I get OpenAL to notify me when a single sample is done playing?

我想避免硬编码的样品长度和设定一个计时器。

I'd like to avoid hardcoding the sample length and setting a timer.

推荐答案

如果您有抽象成一个类的OpenAL源，我想你可以简单地调用 performSelector：afterDelay：当您启动声音：

If you have the OpenAL source abstracted into a class, I guess you can simply call performSelector:afterDelay: when you start the sound:

- (void) play
{
    [delegate performSelector:@selector(soundHasFinishedPlaying)
        afterDelay:self.length];
    …
}

（如果你在此期间手动停止的声音，回调可以取消，请参阅<一个href=\"http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSObject%5FClass/Reference/Reference.html#//apple%5Fref/occ/clm/NSObject/cancel$p$pviousPerformRequestsWithTarget:\"相对=nofollow> NSObject类参考），或者你可以查询 AL_SOURCE_STATE ：

- (void) checkStatus
{
    ALint state;
    alGetSourcei(source, AL_SOURCE_STATE, &state);
    if (state == AL_PLAYING)
        return;
    [timer invalidate];
    [delegate soundHasFinishedPlaying];
}

我不知道如何获得的OpenAL叫你回来。你到底要回调呢？有些东西可以不用回调来解决更好。

I don’t know how to have OpenAL call you back. What exactly do you want the callback for? Some things can be solved better without a callback.

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