从firefox扩展的数据目录播放音频

Question

我正在制作Firefox扩展程序,但我无法播放位于附加组件data目录中的声音.

1. 我尝试的第一件事就是以这种方式在内容脚本中播放它:

   var soundFile = self.options.soundFile;
   (new Audio(soundFile)).play();
   

   where self.options.soundFile是一个引用data目录中资源文件的选项.但我遇到安全限制:

   Security Error: Content at http://example.com may not load or link to resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/stackoverflow-reiew-helper/data/complete.oga.
   

2. 然后我找到了一种在main.js脚本中播放声音的方法(这里:如何在扩展中播放音频？):

   var data = require('sdk/self').data;
   
   exports.main = function() {
           var {Cc, Ci} = require("chrome");
           var sound = Cc["@mozilla.org/sound;1"].createInstance(Ci.nsISound);
           sound.play(data.url('complete.oga'));
   };
   

   这个失败,但有以下异常:

   NS_ERROR_XPC_BAD_CONVERT_JS: Could not convert JavaScript argument arg 0 [nsISound.play]
   undefined 8
   Traceback (most recent call last):
     File "resource://gre/modules/NetUtil.jsm", line 140, in null
       aCallback(pipe.inputStream, aStatusCode, aRequest);
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/net/url.js", line 49, in null
       resolve(data);
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 143, in resolve
       while (pending.length) result.then.apply(result, pending.shift())
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 37, in then
       return { then: function then(resolve) { resolve(value) } }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 117, in resolved
       function resolved(value) { deferred.resolve(resolve(value)) }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 143, in resolve
       while (pending.length) result.then.apply(result, pending.shift())
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 37, in then
       return { then: function then(resolve) { resolve(value) } }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 117, in resolved
       function resolved(value) { deferred.resolve(resolve(value)) }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 143, in resolve
       while (pending.length) result.then.apply(result, pending.shift())
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 37, in then
       return { then: function then(resolve) { resolve(value) } }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 117, in resolved
       function resolved(value) { deferred.resolve(resolve(value)) }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 143, in resolve
       while (pending.length) result.then.apply(result, pending.shift())
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 37, in then
       return { then: function then(resolve) { resolve(value) } }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 117, in resolved
       function resolved(value) { deferred.resolve(resolve(value)) }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 143, in resolve
       while (pending.length) result.then.apply(result, pending.shift())
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 37, in then
       return { then: function then(resolve) { resolve(value) } }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 117, in resolved
       function resolved(value) { deferred.resolve(resolve(value)) }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 143, in resolve
       while (pending.length) result.then.apply(result, pending.shift())
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 123, in then
       else result.then(resolved, rejected)
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 37, in then
       return { then: function then(resolve) { resolve(value) } }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 117, in resolved
       function resolved(value) { deferred.resolve(resolve(value)) }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 55, in effort
       try { return f(options) }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 117, in resolved
       function resolved(value) { deferred.resolve(resolve(value)) }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 143, in resolve
       while (pending.length) result.then.apply(result, pending.shift())
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 37, in then
       return { then: function then(resolve) { resolve(value) } }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 117, in resolved
       function resolved(value) { deferred.resolve(resolve(value)) }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/core/promise.js", line 55, in effort
       try { return f(options) }
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/addon/runner.js", line 90, in onLocalizationReady
       run(options);
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/addon-sdk/lib/sdk/addon/runner.js", line 134, in run
       quit: exit
     File "resource://jid0-a02no8rrtu2pbize7g7sszzo0z8-at-jetpack/stackoverflow-reiew-helper/lib/main.js", line 8, in exports.main
       sound.play(data.url('complete.oga'));
   

   如果我更换sound.play(...)有sound.beep,我得到一个不错的默认系统声音.因此,将资源路径传递给函数应该有问题.

如果它以任何方式重要,我使用在线加载项生成器.

请建议播放扩展音频资源解决方案的解决方案.

Answer 1

nsISound.play()采用nsIURI实例,而不是字符串.你必须先创建它nsIIOService.newURI():

var uri = Cc["@mozilla.org/network/io-service;1"]
            .getService(Ci.nsIIOService)
            .newURI(data.url('complete.oga'), null, null);
sound.play(uri);

我建议不要使用这种方法,但是nsISound.play()API已经被弃用了,而且无论如何我都无法播放ogg文件.

Audio构造函数需要访问适当的HTML文档.在基于SDK的扩展中获取一个的最简单方法是使用page-worker模块:

require("page-worker").Page({
  contentScript: "new Audio('complete.oga').play()",
  contentURL: data.url("blank.html")
});

您的声音文件和blank.html(空HTML文件)都需要位于data/扩展程序的目录中 - 请注意如何通过相对URL加载音频文件.现在我没有办法避免在扩展中有一个空的HTML文件,扩展外的HTML文件无法访问扩展文件而无法播放它们.