从firefox扩展's数据目录播放音频

Play audio from firefox extension's data directory

本文关键字：数据目录 播放 音频 firefox 扩展      更新时间：2023-09-26

我正在制作一个Firefox扩展，我无法播放位于附加组件的data目录中的声音。

  1. 我尝试的第一件事是在内容脚本中播放它:

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

    其中self.options.soundFile为选项，表示data目录下的资源文件。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，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'));

    如果我用sound.beep代替sound.play(...)，我得到一个很好的默认系统声音。因此，将资源路径传递给函数应该有问题。

如果有关系的话，我使用的是在线Add-on Builder。

请给出播放扩展音频资源的解决方案

nsISound.play()接受nsIURI实例，而不是字符串。你必须先通过nsIIOService.newURI()创建它:

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

我不建议这种方法，然而，nsISound.play() API几乎不赞成，IMHO不能够播放ogg文件。

Audio构造函数需要访问适当的HTML文档。在基于sdk的扩展中获得一个最简单的方法是使用page-worker模块:

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

你的声音文件和blank.html(一个空的HTML文件)都需要位于扩展的data/目录中-注意音频文件是如何通过相对URL加载的。现在我没有看到一种方法来避免在扩展名中有一个空的HTML文件，扩展名之外的HTML文件没有访问扩展文件，不能播放它们。

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