8

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

  1. 我尝试的第一件事是以这种方式在内容脚本中播放它：

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

    whereself.options.soundFile是一个选项，它引用data目录中的资源文件。但我符合安全限制：

    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'));
};

    这个失败了，但有以下例外：

    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'));

    如果我替换sound.play(...)为sound.beep，我会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。

如果有任何问题，我正在使用在线附加组件生成器。

请提出一个播放扩展音频资源的解决方案。

4

1 回答 1

7

nsISound.play()接受一个nsIURI实例，而不是一个字符串。您必须首先通过以下方式创建它nsIIOService.newURI()：

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

但是，我建议不要使用这种方法，nsISound.play()API几乎已被弃用，恕我直言，无论如何都无法播放 ogg 文件。

Audio构造函数需要访问正确的 HTML 文档。在基于 SDK 的扩展中获得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（一个空的 HTML 文件）都需要位于data/扩展的目录中 - 请注意音频文件是如何通过相对 URL 加载的。现在我看不到避免在扩展中包含空 HTML 文件的方法，扩展之外的 HTML 文件无权访问扩展文件并且无法播放它们。

于 2013-05-12T21:13:34.640 回答