youtube - 从 as3 中的 youtube 播放列表中获取视频 ID

Question

如何从 as3 中的 youtube 播放列表中获取视频 ID，以便从您的 Tube 播放列表中播放最新上传的视频。

我已经加载播放列表并且它可以正常播放，但我只想播放播放列表中的最新视频。

谢谢

Answer 1

您可以使用 Youtube Data API获取有关播放列表中项目的信息。

为了能够使用 API，您需要生成 API key 。 Info about how to do so can be found here .

要获取某个播放列表中的最新视频，您可以对该 URL 发出 GET 请求:

https://www.googleapis.com/youtube/v3/playlistItems?part=contentDetails&maxResults=1&playlistId={YOUR_PLAYLIST_ID}&key={YOUR_API_KEY}

Let's break it down to see what it does:

• https://www.googleapis.com/youtube/v3/playlistItems - This is the URL endpoint to request data about playlist items in the Youtube Data API
• ?part=contentDetails - We define what details we want returned from the query. In this case we want the video id's, so we use contentDetails
• &maxResults=1 - We are only interested in one item - the latest. (It appears that the result is ordered from latest to oldest, so by only requesting the first video it should return the latest.)
• &playlistId={YOUR_PLAYLIST_ID} - Replace this value with the ID of the playlist in question.
• &key={YOUR_API_KEY} - Replace this value with your API key.

Let's look at a sample request:

var playlistUrl:String = "https://www.googleapis.com/youtube/v3/playlistItems?part=contentDetails&maxResults=1&playlistId=PL4Sz7_l-PtwAG8xye4Y9whykc4OAwbN9f&key={YOUR_API_KEY}"
var playlistReq:URLRequest = new URLRequest(playlistUrl);
var playlistLoader:URLLoader = new URLLoader();
playlistLoader.addEventListener(Event.COMPLETE, handlePlaylistUrlLoaded);
playlistLoader.load(playlistReq);

function handlePlaylistUrlLoaded(e:Event):void {
    trace(playlistLoader.data); // See the response below
    var playlistResponse:Object = JSON.parse(playlistLoader.data); // Parse the JSON response
    trace(playlistResponse.items[0].contentDetails.videoId); // Prints "21Ox58OKFmo" which is the video id of the latest video in this playlist
}

对此示例查询的原始响应是:

{
    "kind": "youtube#playlistItemListResponse",
    "etag": "\"FOuwADrXJjsTKgUIQJoQC6nKNFY/n3kL7MtTJyPOfHU6jmro9gAC1CI\"",
    "nextPageToken": "CAEQAA",
    "pageInfo": {
        "totalResults": 189,
         "resultsPerPage": 1
    },
    "items": [
        {
            "kind": "youtube#playlistItem",
            "etag": "\"FOuwADrXJjsTKgUIQJoQC6nKNFY/aNpryIHyioAUu4C9_WVP8kZGbuE\"",
            "id": "PL88DYY_1F2muJ4Dv0iAFHEuKQuma2y_BH0WbF7AzESJw",
            "contentDetails": {
                "videoId": "21Ox58OKFmo"
            }
        }
    ]
}

编辑以响应更多细节

如果您想使用 YouTube 播放器 API，在将播放列表添加到提示后，您似乎必须等待“视频提示”事件。

因此，从本质上讲，这应该有效(未经测试的代码):

youtubePlayer.addEventListener("onStateChange", onPlayerStateChange);
youtubePlayer.cuePlaylist("{YOUTUBE_PLAYLIST_ID}");

function onPlayerStateChange(event:Event):void {
    if (Object(event).data == YT.PlayerState.CUED) {
        // Playlist cued, the playlist data should now be accessible
        var playlist:Array = youtubePlayer.getPlaylist();
        trace(playlist[0]); // This value should now exist
    }
}