[英]How to implement own cast.receiver.media.Player
前言
我有自己的播放器，带有自己的本地音频引擎。 最近，我决定向其中添加强制转换功能。 为了将音频“流式传输”到自定义演员表应用程序，我决定使用WebSocket并在其上发送float32 PCM，然后通过WebAudio API进行播放。 因为自定义音频格式，所以我决定编写自己的cast.receiver.media.Player实现sample.MyPlayer
问题
呼叫com.google.android.gms.cast.RemoteMediaPlayer上的play或pause ，
java.lang.IllegalStateException：当前没有媒体会话
当然，在通话之前，我要做com.google.android.gms.cast.RemoteMediaPlayer.load ，这里是有趣的时刻。 出于某种原因， sample.MyPlayer未收到mediaSessionId似乎与Java端的异常有关。 但是我在js端的sample.MyPlayer.load调用了。
我的应用程序的日志片段
cast_receiver.js：61 [21.034s] [cast.receiver.MediaManager]接收到的加载消息：{“ requestId”：2，“ media”：{...}，“ autoplay”：false，“ currentTime”：0}
来自默认接收器样本的日志片段
cast_receiver.js：61 [30.243s] [cast.receiver.MediaManager]接收到的加载消息：{“ type”：“ LOAD”，“ requestId”：2，“ mediaSessionId”：0，“ customData”：null，“ media” ：{...}，“自动播放”：true，“ currentTime”：0}
如您所见，我的自定义接收器中的有效载荷缺少mediaSessionId ， type和customData键
这是我发现的所有问题。
我的player.html
<!DOCTYPE html>
<html>
<head>
<title>Cast Reference Receiver</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="player.css" />
<script type="text/javascript" src="//www.gstatic.com/cast/sdk/libs/receiver/2.0.0/cast_receiver.js"></script>
<script type="text/javascript" src="//www.gstatic.com/cast/sdk/libs/mediaplayer/1.0.0/media_player.js"></script>
<script type="text/javascript" src="player.js"></script>
</head>
<body style="margin: 0">
<div id="player" class="player">
<div class="logo"></div>
<div class="spinner"></div>
<div class="watermark"></div>
<div class="gradient"></div>
<div class="overlay">
<div class="media-info">
<div class="media-artwork"></div>
<div class="media-text">
<div class="media-title"></div>
<div class="media-subtitle"></div>
</div>
</div>
<div class="preview-mode-info">
<div class="preview-mode-artwork"></div>
<div class="preview-mode-text">
<div class="preview-mode-timer">
<div class="preview-mode-timer-starts">Up next in </div>
<div class="preview-mode-timer-countdown"></div>
<div class="preview-mode-timer-sec"> secs...</div>
</div>
<div class="preview-mode-title"></div>
<div class="preview-mode-subtitle"></div>
</div>
</div>
<div class="controls">
<span class="controls-play-pause"></span>
<span class="controls-cur-time"></span>
<span class="controls-total-time"></span>
<div class="controls-progress">
<div class="controls-progress-inner progressBar"></div>
<div class="controls-progress-thumb"></div>
</div>
</div>
</div>
</div>
<script>
var mediaManager_ = new cast.receiver.MediaManager(new sample.MyPlayer(), [
cast.receiver.media.Command.LOAD,
cast.receiver.media.Command.PLAY,
cast.receiver.media.Command.STOP,
cast.receiver.media.Command.GET_STATUS,
cast.receiver.media.Command.PAUSE,
cast.receiver.media.Command.STREAM_VOLUME,
cast.receiver.media.Command.QUEUE_NEXT,
cast.receiver.media.Command.QUEUE_PREV
]);
var receiverManager = cast.receiver.CastReceiverManager.getInstance();
receiverManager.start();
</script>
</body>
</html>
问题
java.lang.IllegalStateException: No current media session问题java.lang.IllegalStateException: No current media session ？
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