如何在AVAudioPlayers之间交叉淡入淡出 [英] How to cross fade between AVAudioPlayers

问题描述

我想使用AVAudioPlayer并交叉淡入淡出超过2个mp3文件.

I want to use AVAudioPlayer and cross fade more than 2 mp3 files.

我有5个mp3文件和5个页面"myScrollView"，其中包含UIScrollView类，pagedEnabled = YES.

I have 5 mp3 files and 5 pages "myScrollView" with UIScrollView class and pagingEnabled = YES.

当用户移动页面时，我想播放每个页面的每首歌曲，上一个mp3文件的音量逐渐消失，下一个mp3的音量逐渐消失.

When user move page, I want to play each songs for each page with volume fade out for previous mp3 file and fade in for next mp3.

请帮助解决此问题.

推荐答案

这是一个非常老的线程，但我只是在寻找有关交叉淡入淡出问题的解决方案并找到了它.我是这样解决的:

It's a really old thread, but I just looked for a solution concerning the cross fading issue and found it. I solved it like this:

-(void)crossFadePlayerOne:(AVAudioPlayer *)player1 andPlayerTwo:(AVAudioPlayer *)player2 withCompletion:(void(^)())completion{
    if([player1 volume] > 0){
        [player1 setVolume:[player1 volume] - 0.05];
        [player2 setVolume:[player2 volume] + 0.05];

        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.1 * NSEC_PER_SEC),dispatch_get_main_queue(),^{
            [self crossFadePlayerOne:player1 andPlayerTwo:player2 withCompletion:completion];
        });

    }else{
        if(completion){
            completion();
        }
    }
}

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