Google演員：如何在默認媒體播放器中顯示元數據？

Question

我試圖讓我的Chrome發件人應用程序將元數據發送到默認媒體接收器應用程序，但默認媒體接收器不顯示元數據。我找不到文檔或示例。有誰知道如何實現這個？下面的代碼播放音頻，但播放器不顯示任何圖像或其他元數據。

初始化：

var sessionRequest = new chrome.cast.SessionRequest(chrome.cast.media.DEFAULT_MEDIA_RECEIVER_APP_ID); 
    var apiConfig = new chrome.cast.ApiConfig(sessionRequest, 
    sessionListener, 
    receiverListener); 
    chrome.cast.initialize(apiConfig, onInitSuccess, onError); 
    chrome.cast.requestSession(onRequestSessionSuccess, onLaunchError); 

...

加載介質

url = "url-to-media" 
var mediaInfo = new chrome.cast.media.MediaInfo(url, 'audio/aac'); 
mediaInfo.metadata = new chrome.cast.media.MusicTrackMediaMetadata() 
mediaInfo.metadata.albumName = 'This is the name of the album' 
mediaInfo.metadata.artistName = 'This is the name of the artist' 
mediaInfo.metadata.songName = 'This is the name of the song' 
im = chrome.cast.Image('http://m1.behance.net/rendition/modules/575407/disp/822271229466847.png') 
mediaInfo.metadata.images = new Array(im) 
var request = new chrome.cast.media.LoadRequest(mediaInfo); 
session.loadMedia(request,onMediaDiscovered.bind(this, 'loadMedia'), onMediaError()) 

Answer 1

試試這個 -

mediaInfo.metadata.title = 'This is the name of the song'; 
mediaInfo.metadata.subtitle = 'This is the name of the artist'; 

Answer 2

當前默認媒體接收器應用程序接受某些元數據字段。詳細規格在這裏給出：https://developers.google.com/cast/docs/reference/messages。

對於MusicTrackMediaMetaData類型，請務必將metadataType設置爲3.以下片段適用。

mediaInfo.metadata = new chrome.cast.media.MusicTrackMediaMetadata() 
mediaInfo.metadata.metadataType = 3; 
mediaInfo.metadata.title = 'This is the name of the title'; 
mediaInfo.metadata.albumArtist = 'This is the name of the album artist'; 
mediaInfo.metadata.artist = 'This is the name of the artist'; 
mediaInfo.metadata.albumName = 'This is the name of the album'; 
//mediaInfo.metadata.composer = 'composer'; 
//mediaInfo.metadata.trackNumber = 13; 
//mediaInfo.metadata.discNumber = 2; 
mediaInfo.metadata.releaseDate = '2011'; 
mediaInfo.metadata.images = [{'url': 'http://m1.behance.net/rendition/modules/575407/disp/822271229466847.png'}];    
var request = new chrome.cast.media.LoadRequest(mediaInfo); 
session.loadMedia(request, onMediaDiscovered.bind(this, 'loadMedia'), onMediaError()); 

已解決一個錯誤，用於修復Chrome發件人SDK和默認接收方應用程序之間的某些不匹配。

您可以隨時製作您自己的自定義接收器應用程序，並添加您自己的自定義數據，如下所示。

var mediaInfo = new chrome.cast.media.MediaInfo(url, 'audio/mp3'); 
var request = new chrome.cast.media.LoadRequest(mediaInfo); 
var payload = { 
    "albumName": 'This is the name of the album', 
    "songName": 'This is the name of the song', 
    "thumb": 'http://m1.behance.net/rendition/modules/575407/disp/822271229466847.png', 
    "artistName": 'This is the name of the artist' 
}; 
var json = { 
    "payload": payload 
}; 
request.customData = json; 

Answer 3

我們剛剛發佈了一個Cast擴展功能測試版，它已經解決了這個問題。見本公告：https://plus.google.com/+ShawnShen/posts/aVXSHyceNbR。

我還添加了GitHub上的一個項目，在提供了示例代碼：

https://github.com/googlecast/CastMedia-chrome