本文共 3644 字，大约阅读时间需要 12 分钟。
我个人的笔记一般比较随便，层次只有自己看的明白。
对于自己发的东西，不喜欢码字码版面，不错，我就是这么偏执。
ExoPlayer:
google文档明确指出，ExoPlayer是拓展和方便MediaPlayer应用而开发的。支持更多的功能和特性。
由于是在MediaPlayer基础上拓展的，所以，所有MediaPlayer的API和所支持的音视频特质均有增无减。
DASH, SmoothStreaming and HLS adaptive streams, as well as formats such as MP4, M4A, FMP4, WebM, MKV, MP3, Ogg, WAV, MPEG-TS, MPEG-PS, FLV and ADTS (AAC). It also discusses ExoPlayer events, messages, customization and DRM support. compile 'com.google.android.exoplayer:exoplayer:r2.X.X' compile 'com.google.android.exoplayer:exoplayer-core:r2.X.X' compile 'com.google.android.exoplayer:exoplayer-dash:r2.X.X'compile 'com.google.android.exoplayer:exoplayer-ui:r2.X.X'
其他功能支持库： exoplayer-core: Core functionality (required). exoplayer-dash: Support for DASH content. exoplayer-hls: Support for HLS content. exoplayer-smoothstreaming: Support for SmoothStreaming content. exoplayer-ui: UI components and resources for use with ExoPlayer. creating player://Create a default TrackSelectorHandler mainHandler = new Handler();BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);//Create the playerSimpleExoPlayer player = ExoPlayerFactory.newSimpleInstance(context, trackSelector);/** * SimpleExoPlayerView, which encapsulates a PlaybackControlView and a Surface onto which video is rendered. * setVideoSurfaceView, setVideoTextureView, setVideoSurfaceHolder and setVideoSurface. * simpleExoPayerView.setPlayer(player);**/preparing:
// Measures bandwidth during playback. Can be null if not required.DefaultBandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();// Produces DataSource instances through which media data is loaded.DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(context,Util.getUserAgent(context, "yourApplicationName"), bandwidthMeter);// Produces Extractor instances for parsing the media data.ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();// This is the MediaSource representing the media to be played.MediaSource videoSource = new ExtractorMediaSource(mp4VideoUri,dataSourceFactory, extractorsFactory, null, null);// Prepare the player with the source.player.prepare(videoSource);这里的意思是说，ExoPlayer对于媒体源都是用实现MediaSource来封装复用的。这一点，有点像对androidAnimatio封装，可以叠合。 DASH:DashMediaSource SmoothStreaming:SsMediaSource HLS:HlsMediaSource regular media:ExtractorMediaSource setPlayWhenReady();seekTo(); ExoPlayer.release //合并播放
MediaSource videoSource = new ExtractorMediaSource(videoUri,...);MediaSource subtitleSource = new SingleSampleMediaSource(subtitleUri,...);//Plays the video with the sideloaded subtitleMergingMediaSource mergedSource = new MergingMediaSource(videoSouce,subtitleSource);//循环播放
MediaSource source = new ExtractorMediaSource(videoUri,...);//Loops the video indefinitely.LoopingMediaSource loopingSouce = new LoopingMediaSource(source(,int));//播放一个视频序列
MediaSource firstSource = new ExtractorMediaSource(firstVideoUri,...);MediaSource secondSource = new ExtratorMediaSource(secondVideoUri,...);//Plays the first video,then the second videoConcatenatingMediaSource concatenatedSource = new ConcatenatingMediaSource(firstSource,secondSource);
在ExoPlayer的特性中，是支持数字版权的，Digit Rights Manager,DRM，具体的可以查看google的相信文档，这里只是抛砖引玉。还要说的是，DRM和Exo的一些东西，需要在android4.4之后才有支持。所以在选型时，还要考虑更多的东西。。如果没记错的话，BiLibiLi，也就是B站，在自己封装的解编码框架基础上，实现了一个类似ExoPlayer的东西。可以作为选型的方案之一。
Google提供这样的支持库，扩展和强化功能，已经不是一点两点的事了。在以前的使用有一个CustomWeb好像，记不清了，用新的思想来加载WebView,对于原理和项目我也记不清了，支持到这是对android WebView的提高和优化，并不是去解决浏览器渲染核心这个级别的问题。
转载地址：http://tcegi.baihongyu.com/