我正在开发一个“启动板”类型的应用程序。我的应用程序可以在桌面和移动浏览器上运行，但由于某种原因，我无法让它在科尔多瓦运行。
我在下面的代码中将应用程序简化为最简单的形式。您还可以在此处找到工作版本，并在此处找到演示 cordova 项目。
更多细节：
- 没有错误被抛出
- 我只在安卓上测试过
- 我也试过人行横道
- 您可以看到它生成的 base64 编码音频在 cordova 中只是空白，但在其他情况下是一个很大的长字符串。
<!DOCTYPE html>
<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
<html>
<head>
<!--
Customize this policy to fit your own app's needs. For more guidance, see:
https://github.com/apache/cordova-plugin-whitelist/blob/master/README.md#content-security-policy
Some notes:
* gap: is required only on iOS (when using UIWebView) and is needed for JS->native communication
* https://ssl.gstatic.com is required only on Android and is needed for TalkBack to function properly
* Disables use of inline scripts in order to mitigate risk of XSS vulnerabilities. To change this:
* Enable inline JS: add 'unsafe-inline' to default-src
-->
<!--<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *; img-src 'self' data: content:;">-->
<meta name="format-detection" content="telephone=no">
<meta name="msapplication-tap-highlight" content="no">
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">
<link rel="stylesheet" type="text/css" href="css/index.css">
<title>Hello World</title>
</head>
<body>
<div class="app">
<h3>First, choose a file</h3>
<input id="input" type="file" accept="audio/*" onchange="inputChanged()"/>
<h3>Second, play the file</h3>
<audio id="audio" loop controls></audio>
<h3>Third, hit the record button. Click again to stop recording.</h3>
<button id="record" data-state="stopped">Record</button>
<h3>Finally, listen to your recording!</h3>
<audio id="player" controls></audio>
</div>
<script type="text/javascript">
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
// elems
var input = document.getElementById("input")
var audio = document.getElementById("audio")
var record = document.getElementById("record")
var player = document.getElementById("player")
// html5 audio
var context = new (window.AudioContext || window.webkitAudioContext)()
var recorderDest = context.createMediaStreamDestination()
var chunks = []
var mediaRecorder = new window.MediaRecorder(recorderDest.stream)
mediaRecorder.ondataavailable = function (e) {
// push each chunk (blobs) in an array
chunks.push(e.data)
}
mediaRecorder.onstop = function (e) {
// Make blob out of our blobs, and open it.
var blob = new window.Blob(
chunks,
{
"type": "audio/ogg; codecs=opus"
}
)
var reader = new window.FileReader()
reader.readAsDataURL(blob)
reader.onloadend = function() {
player.src = reader.result
}
// player.src = window.URL.createObjectURL(blob)
window.theBlob = blob
chunks = []
}
var app = {
// Application Constructor
initialize: function() {
document.addEventListener('deviceready', this.onDeviceReady.bind(this), false);
// events
record.addEventListener("click", function (e) {
console.log("click", record.dataset.state)
if (record.dataset.state === "stopped") {
// first, create a blank buffer
// we need to do this because we need to "record" negative space
// or times when a pad isn't playing
// https://developer.mozilla.org/en-US/docs/Web/API/AudioContext/createBuffer
var blankBuffer = context.createBuffer(2, 22050, 44100)
var blankSource = context.createBufferSource()
blankSource.buffer = blankBuffer
blankSource.connect(recorderDest)
blankSource.loop = true
blankSource.start(0)
mediaRecorder.start()
record.dataset.state = "recording"
record.innerHTML = "recording"
record.style.backgroundColor = "red"
} else {
mediaRecorder.stop()
record.dataset.state = "stopped"
record.innerHTML = "record"
record.style.backgroundColor = "white"
}
})
},
// deviceready Event Handler
//
// Bind any cordova events here. Common events are:
// 'pause', 'resume', etc.
onDeviceReady: function() {
this.receivedEvent('deviceready');
},
// Update DOM on a Received Event
receivedEvent: function(id) {
var parentElement = document.getElementById(id);
var listeningElement = parentElement.querySelector('.listening');
var receivedElement = parentElement.querySelector('.received');
listeningElement.setAttribute('style', 'display:none;');
receivedElement.setAttribute('style', 'display:block;');
console.log('Received Event: ' + id);
}
};
app.initialize();
function inputChanged () {
console.log("changed")
var file = input.files[0]
var fileUrl = window.URL.createObjectURL(file)
audio.src = fileUrl
var source = context.createMediaElementSource(audio)
source.connect(context.destination)
source.connect(recorderDest)
}
</script>
</body>
</html>我完全被难住了，越来越沮丧。谢谢你的帮助！