我如何为播放声音的结束创建承诺? [英] How can i create a promise for the end of playing sound?

问题描述

我有一个简单的 JavaScript 来加载声音:

I have a simple JavaScript that loads sounds:

  prefix = 'modules/sounds/';
 _sounds = ['nameOfSound','nameOfSound','nameOfSound'];


 for (var sound in _sounds) {
                if (_sounds.hasOwnProperty(sound)) {
                    var cached = _sounds[sound];
                    cached.audio = new Audio(prefix + cached.src);
                    }
                }
            }

所有内容都被缓存在这里，然后在 angular 中我只有一个执行以下功能的服务:

All is being cached here, and then in angular I just have a service that does the following function:

 this.play = function(trackName) {
        _sounds[trackName].audio.play();
    };

我想要的是一个简单的声音承诺，所以当我调用它时，我会有这样的东西:

What I want is a simple promise for the sound, so when I call it, I will have something like this:

soundService.play('boom').then(function(){
    do something here
});

这可能吗?

推荐答案

您可以制作一个通用对象，您可以根据自己的设置实施该对象:

You can make a generic object that you can implement to suit your setup:

function play(url) {
     return new Promise(function(resolve, reject) {   // return a promise
         var audio = new Audio();                     // create audio wo/ src
         audio.preload = "auto";                      // intend to play through
         audio.autoplay = true;                       // autoplay when loaded
         audio.onerror = reject;                      // on error, reject
         audio.onended = resolve;                     // when done, resolve

         audio.src = path + url + suffix; // just for example
     });
}

现在您可以调用:

play("boom").then(function() {

});

由于其缓冲行为，缓存音频元素没有什么意义.指示预加载将告诉浏览器您将要播放音频文件.在我看来，这对客户和系统也更好.

There is little point in caching audio elements due their buffering behavior. Indicating preload will tell browser that you will want to play through the audio file. In my opinion this is also nicer to the client and the system.

function play(url) {
  return new Promise(function(resolve, reject) { // return a promise
    var audio = new Audio();                     // create audio wo/ src
    audio.preload = "auto";                      // intend to play through
    audio.autoplay = true;                       // autoplay when loaded
    audio.onerror = reject;                      // on error, reject
    audio.onended = resolve;                     // when done, resolve

    audio.src = url
  });
}

play(sample).then(function() {
  alert("Done!");
})

<script>
var sample = "data:audio/wav;base64,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"
</script>

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