【发布时间】：2015-01-10 17:48:04
【问题描述】：
我想为我的自定义接收器实现媒体播放器功能。 在google开发者网站上，我找到了实现sender和styled media receiver应用程序的描述。
我已经完成了这个示例，并且效果很好。我可以将托管在 Google Drive 上的 MP3 文件投射到我的 chromecast 设备上。
现在，我已经实现了一个自定义接收器（见附件），它应该能够播放引用 m3u8 文件的 URL。为此，我正在使用 Google 建议的媒体播放器库。
<body>
<div>
<p id='text'> </p>
<video id='vid'> </video>
</div>
<script type="text/javascript" src="https://www.gstatic.com/cast/sdk/libs/receiver/2.0.0/cast_receiver.js"></script>
<script type="text/javascript" src="https://www.gstatic.com/cast/sdk/libs/mediaplayer/1.0.0/media_player.js"></script>
<script type="text/javascript">
// If you set ?Debug=true in the URL, such as a different App ID in the
// developer console, include debugging information.
if (window.location.href.indexOf('Debug=true') != -1) {
cast.receiver.logger.setLevelValue(cast.receiver.LoggerLevel.DEBUG);
cast.player.api.setLoggerLevel(cast.player.api.LoggerLevel.DEBUG);
}
console.log("mediaElement set");
var mediaElement = document.getElementById('vid');
// Create the media manager. This will handle all media messages by default.
window.mediaManager = new cast.receiver.MediaManager(mediaElement);
// Remember the default value for the Receiver onLoad, so this sample can Play
// non-adaptive media as well.
window.defaultOnLoad = mediaManager.onLoad;
mediaManager.onLoad = function (event) {
// The Media Player Library requires that you call player unload between
// different invocations.
if (window.player !== null) {
player.unload(); // Must unload before starting again.
window.player = null;
}
// This trivial parser is by no means best practice, it shows how to access
// event data, and uses the a string search of the suffix, rather than looking
// at the MIME type which would be better. In practice, you will know what
// content you are serving while writing your player.
if (event.data['media'] && event.data['media']['contentId']) {
console.log('Starting media application');
var t = document.getElementById('text');
t.innerHTML = event.data['media'];
console.log("EventData: "+event.data);
console.log("EventData-Media: "+event.data['media']);
console.log("EventData-ContendID: "+event.data['media']['contentId']);
var url = event.data['media']['contentId'];
console.log("URL: "+url);
// Create the Host - much of your interaction with the library uses the Host and
// methods you provide to it.
window.host = new cast.player.api.Host(
{'mediaElement':mediaElement, 'url':url});
var ext = url.substring(url.lastIndexOf('.'), url.length);
var initStart = event.data['media']['currentTime'] || 0;
var autoplay = event.data['autoplay'] || true;
var protocol = null;
mediaElement.autoplay = autoplay; // Make sure autoplay get's set
protocol = cast.player.api.CreateHlsStreamingProtocol(host);
host.onError = function(errorCode) {
console.log("Fatal Error - "+errorCode);
if (window.player) {
window.player.unload();
window.player = null;
}
};
// If you need cookies, then set withCredentials = true also set any header
// information you need. If you don't need them, there can be some unexpected
// effects by setting this value.
// host.updateSegmentRequestInfo = function(requestInfo) {
// requestInfo.withCredentials = true;
// };
console.log("we have protocol "+ext);
if (protocol !== null) {
console.log("Starting Media Player Library");
window.player = new cast.player.api.Player(host);
window.player.load(protocol, initStart);
}
else {
window.defaultOnLoad(event); // do the default process
}
}
}
window.player = null;
console.log('Application is ready, starting system');
window.castReceiverManager = cast.receiver.CastReceiverManager.getInstance();
castReceiverManager.start();
</script>
</body>
我发现，使用媒体播放器库可以投射 .m3u8、.ism 和 .mpd 文件。因此，我创建了一个 m3u8 文件，如下所示，将其托管到 Google Drive，并尝试将其投射到我的自定义接收器。
#EXTM3U
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=173952
https://www.googledrive.com/host/0B1x31lLRAxTMRndtNkhSWVdGLVE
但它不起作用。我使用 Goolge Cast Developer Console 来调试自定义接收器。通过执行
window.player.load(protocol, initStart);
命令，我在控制台上收到一个 FATAL ERROR。
我认为问题出在自定义接收器代码上，因为来自 google 文档的发送器应用程序可以与样式化媒体接收器一起正常工作。
有没有人知道这个问题或在自定义接收器代码上看到一些问题？有谁知道如何调试风格化的媒体播放器？如果我可以看到与样式化的媒体播放器交换了哪些消息，那会容易得多，但如果我激活调试，我就看不到交换的消息。
【问题讨论】：
标签： android casting chromecast google-cast custom-receiver