In -depth analysis of the technical principles of Exoplayer framework in the Java class library

In -depth analysis of the technical principles of Exoplayer framework in the Java class library Exoplayer is a powerful and flexible open source media player framework that can play various media formats on Android devices.It is developed by Google and is widely used on the Android platform.This article will explore the technical principles of the Exoplayer framework and how to use it in Java. Exoplayer uses a architecture called "componentization", which means that its function is modularized and encapsulated in different components.These components include media loaders (Medialoaders), renderrs, players, and so on.Each component has its own responsibilities, and work together by dependent injection. The media loader is responsible for obtaining media data from the network or local storage, and transmits data to the renderer for decoding and rendering.Exoplayer provides several different types of media loaders, such as HLS (HTTP LIVE Streaming) loader, Dash (Dynamic Adaptive Streaming Over HTTP) loader, etc.This enables Exoplayer to adapt to different media formats and transmission protocols. The rendereer is responsible for decoding the audio and video data and rendering to the audio and video output of the device.ExoPlayer supports multiple renderers that can rendering multiple audio and video orbit at the same time.For example, one rendereer can handle the audio track, and the other rendereer can handle the video track. The player is the core component of the Exoplayer framework. It is responsible for coordinating the interaction between the media loader and the renderer, and provides functions such as controlling playback status and jumping to the specified position.By calling the player's method, developers can easily control the operation of the media's playback, suspension, and stop. It is very simple to play the media in Java with the Exoplayer framework.First, you need to introduce an Exoplayer library in the Android project.You can complete it by adding the following dependencies to the Build.gradle file:: implementation 'com.google.android.exoplayer:exoplayer:2.X.X' You need to create an Exoplayer instance and set the corresponding renderer and media resources.The following is a simple example: SimpleExoPlayer player = new SimpleExoPlayer.Builder(context).build(); player.setVideoSurfaceView(videoSurfaceView); MediaItem mediaItem = MediaItem.fromUri(mediaUri); player.setMediaItem(mediaItem); player.prepare(); player.play(); The above code creates a SimpleExoPlayer instance and set VideoSurfaceView to video output.Then use the Mediatem.fromuri method to create a media item and pass it to the player.Finally, call the Prepare method to prepare the player and use the play method to start playing the media. In addition to simple playback functions, Exoplayer also provides many advanced features, such as jumping to the specified position, loading subtitles, setting playback speed, etc.You can implement these functions by calling the corresponding ExoPlayer method. Summarize: Exoplayer is a powerful and flexible media player framework. It realizes high scalability and flexibility through componentization and dependency injection.By studying the technical principles of the Exoplayer framework, we can better understand its working principles and use its custom media playback function in Java. I hope this article will help you understand the technical principles of the Exoplayer framework and be able to use it flexibly in future development.Thank you for reading! references: -Exoplayer official document: https://exoplayer.dev/ -ExoPlayer Github warehouse: https: //github.com/google/exoplayer