如何将 Google Cast v3 与 ExoPlayer v2 集成?

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【中文标题】如何将 Google Cast v3 与 ExoPlayer v2 集成?【英文标题】:How to integrate Google Cast v3 with ExoPlayer v2? 【发布时间】:2017-08-24 13:03:17 【问题描述】:

如何将 Google Cast v3 与 ExoPlayer v2 完全集成?该活动将包含一个FrameLayout,其中包含一个com.google.android.exoplayer2.ui.SimpleExoPlayerView。 Google tutorial 仅涵盖与 VideoView 的集成。

【问题讨论】:

【参考方案1】:

以下代码在此 Gist 中的 Kotlin 类中可用,应该可以帮助首次尝试设置 CastPlayer 的人:

https://gist.github.com/stefan-zh/fd52e0ee06088ac4086d2ea3fb7d7f3e

此外,阅读 Google 提供的本教程将对您有所帮助:https://codelabs.developers.google.com/codelabs/cast-videos-android/index.html#0

我也使用这个教程开始:https://android.jlelse.eu/sending-media-to-chromecast-has-never-been-easier-c331eeef1e0a


以下是如何使用 ExoPlayer 及其 Cast 扩展实现此目的的详细说明。

1。您将需要这些依赖项:

// ExoPlayer is an advanced media player for playing media files
implementation "com.google.android.exoplayer:exoplayer-core:$exoplayer_version"
implementation "com.google.android.exoplayer:exoplayer-ui:$exoplayer_version"
implementation "com.google.android.exoplayer:extension-cast:$exoplayer_version"

2。您将需要 Cast 按钮

Cast 按钮可以添加到活动的选项菜单中。这是推荐的方法。

将以下内容添加到res/menu/browse.xml(在我的例子中,菜单文件称为browse.xml):

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto" >
    <item
        android:id="@+id/media_route_menu_item"
        android:title="@string/media_route_menu_title"
        app:actionProviderClass="androidx.mediarouter.app.MediaRouteActionProvider"
        app:showAsAction="always"/>
</menu>

然后将以下代码添加到您的 Activity 以启用castButton

/**
 * We need to populate the Cast button across all activities as suggested by Google Cast Guide:
 * https://developers.google.com/cast/docs/design_checklist/cast-button#sender-cast-icon-available
 */
override fun onCreateOptionsMenu(menu: Menu?): Boolean 
   val result = super.onCreateOptionsMenu(menu)
   menuInflater.inflate(R.menu.browse, menu)
   castButton = CastButtonFactory.setUpMediaRouteButton(applicationContext, menu, R.id.media_route_menu_item)
   return result

3。为 Cast 上下文声明选项提供程序

您需要这个,以便获得包含您可以投射到的设备列表的选项对话框。将此添加到您的 AndroidManifest.xml 中的 application 标记中:

<meta-data
   android:name="com.google.android.gms.cast.framework.OPTIONS_PROVIDER_CLASS_NAME"
   android:value="com.google.android.exoplayer2.ext.cast.DefaultCastOptionsProvider" />

4。你的Activity需要实现ExoPlayer的Cast Extension接口SessionAvailabilityListener

此界面将允许您监听 Cast 会话可用性的变化。根据 Cast 会话是否可用,您可以将播放定向到本地播放器或远程播放器。

override fun onCastSessionAvailable() 
    playOnPlayer(castPlayer)


override fun onCastSessionUnavailable() 
    playOnPlayer(exoPlayer)

5。您将需要逻辑来初始化播放器:

注意我们如何调用castPlayer?.setSessionAvailabilityListener(this),其中this 指的是实现SessionAvailabilityListener 接口的Activity。当 Cast 会话可用性发生变化时,将调用侦听器的方法。

private fun initializePlayers() 
    exoPlayer = SimpleExoPlayer.Builder(this).build()
    playerView.player = exoPlayer

    if (castPlayer == null) 
        castPlayer = CastPlayer(castContext)
        castPlayer?.setSessionAvailabilityListener(this)
    

    // start the playback
    if (castPlayer?.isCastSessionAvailable == true) 
        playOnPlayer(castPlayer)
     else 
        playOnPlayer(exoPlayer)
    

6。您需要在所选播放器上播放的逻辑:

此方法允许您存储播放状态(playbackPositionplayWhenReadywindowIndex) 为本地或远程播放器创建正确的媒体类型 选择应该开始播放的播放器

playOnPlayer() 方法:

private fun playOnPlayer(player: Player?) 
    if (currentPlayer == player) 
        return
    

    // save state from the existing player
    currentPlayer?.let 
        if (it.playbackState != Player.STATE_ENDED) 
            it.rememberState()
        
        it.stop(true)
    

    // set the new player
    currentPlayer = player

    // set up the playback
    // if the current player is the ExoPlayer, play from it
    if (currentPlayer == exoPlayer) 
        // build the MediaSource from the URI
        val uri = Uri.parse(videoClipUrl)
        val dataSourceFactory = DefaultDataSourceFactory(this@SampleCastingPlayerActivity, "exoplayer-agent")
        val mediaSource = ProgressiveMediaSource.Factory(dataSourceFactory).createMediaSource(uri)

        // use stored state (if any) to resume (or start) playback
        exoPlayer?.playWhenReady = playWhenReady
        exoPlayer?.seekTo(currentWindow, playbackPosition)
        exoPlayer?.prepare(mediaSource, false, false)
    

    // if the current player is the CastPlayer, play from it
    if (currentPlayer == castPlayer) 
        val metadata = MediaMetadata(MediaMetadata.MEDIA_TYPE_MOVIE)
        metadata.putString(MediaMetadata.KEY_TITLE, "Title")
        metadata.putString(MediaMetadata.KEY_SUBTITLE, "Subtitle")
        metadata.addImage(WebImage(Uri.parse("any-image-url")))

        val mediaInfo = MediaInfo.Builder(videoClipUrl)
            .setStreamType(MediaInfo.STREAM_TYPE_BUFFERED)
            .setContentType(MimeTypes.VIDEO_MP4)
            .setMetadata(metadata)
            .build()
        val mediaItem = MediaQueueItem.Builder(mediaInfo).build()
        castPlayer?.loadItem(mediaItem, playbackPosition)
    

7。记住状态并清理资源

每次在后台或前台之间切换应用程序时,您都需要释放或请求资源。每次您将播放器的资源释放回系统时,您都需要保存其状态。

/**
 * Remembers the state of the playback of this Player.
 */
private fun Player.rememberState() 
    this@SampleCastingPlayerActivity.playWhenReady = playWhenReady
    this@SampleCastingPlayerActivity.playbackPosition = currentPosition
    this@SampleCastingPlayerActivity.currentWindow = currentWindowIndex


/**
 * Releases the resources of the local player back to the system.
 */
private fun releaseLocalPlayer() 
    exoPlayer?.release()
    exoPlayer = null
    playerView.player = null


/**
 * Releases the resources of the remote player back to the system.
 */
private fun releaseRemotePlayer() 
    castPlayer?.setSessionAvailabilityListener(null)
    castPlayer?.release()
    castPlayer = null

【讨论】:

是否可以更改 DefaultCastOptionsProvider?我尝试将 Cast MiniControllerFragment 添加到应用程序中,当我点击它时,ExpandedControllerActivity 没有按应有的方式打开。 是的,有可能。您可以编写自己的类来扩展OptionsProvider 并覆盖getCastOptions(context: Context?): CastOptionsgetAdditionalSessionProviders(context: Context?): MutableList&lt;SessionProvider&gt;。然后,您将在 AndroidManifest.xml 中使用此类的完全限定名称【参考方案2】:

Google Cast SDK 独立于本地播放器,您可以使用ExoPlayerMediaPlayer (VideoView)

一旦您的 APP 有活动会话,请将 url 放入 MediaInfo

val movieMetadata = MediaMetadata(MediaMetadata.MEDIA_TYPE_MOVIE)

movieMetadata.putString(MediaMetadata.KEY_TITLE, "Title")
movieMetadata.putString(MediaMetadata.KEY_SUBTITLE, "Sub")

val mediaLoadOptions =  MediaInfo.Builder( < URL > )
     .setStreamType(MediaInfo.STREAM_TYPE_BUFFERED)
     .setContentType(< Content Type of Media>)
     .setMetadata(movieMetadata)
     .setStreamDuration(<Media Duration >)
     .build()

mCastSession.remoteMediaClient.load(buildMediaInfo(url), mediaLoadOptions)

如果您需要流式传输本地媒体,则需要使用NanoHttpd 或您选择的其他方式自己流式传输,并实现Cast Receiver

【讨论】:

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