exoplayer的使用简介和实测播放dash流、hls（一）_exo如何播放hls

一、exoplayer的相关库的集成关联

     1.1   关联的方法有两种，第一种是常规的远程依赖

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本人的是as3.1。我这里的exo库用的是2.8.0。需要使用其他版本的点这里：历代exoplayer-release版本简介。

     

   1.2第二种关联。是将工程下载到本地，然后添加本地库。

     1.2.1下载到本地：

   使用git命令下载到本地，或者直接在github上download下来

git clone https://github.com/google/ExoPlayer.git
git checkout release-v2

    1.2.1修改settings.gradle这个文件，替代成你下载到的路径，如下所示：

 我将exoplayer下载到了e:/exo player/   在自己新建的的项目里面的setting.gradle文件 里面修改： 

include ':app', ':library', ':library-dash', ':lib100'
gradle.ext.exoplayerRoot = 'E:\\exo player\\ExoPlayer-release-v2'
gradle.ext.exoplayerModulePrefix = 'exoplayer-'
apply from: new File(gradle.ext.exoplayerRoot, 'core_settings.gradle')

  这样就生成本地的库了

 1.2.3 本地关联

  

implementation project(':exoplayer-library-core')
implementation project(':exoplayer-library-dash')
implementation project(':exoplayer-library-ui')

二、exoplayer的使用。

   2.1 布局文件activity_main：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <com.google.android.exoplayer2.ui.PlayerView
        android:id="@+id/pv_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
 
 
</android.support.constraint.ConstraintLayout>

   2.2 创建exoplayer对象，及简单播放dash流

   

public class MainActivity extends AppCompatActivity {
 
    private PlayerView pv_view;
    private DataSource.Factory mediaDataSourceFactory;
    private SimpleExoPlayer mPlayer;
 
    private static final DefaultBandwidthMeter BANDWIDTH_METER = new DefaultBandwidthMeter();
    private MediaSource dashMediaSource;
    private DefaultTrackSelector trackSelector;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
         initView();
        mediaDataSourceFactory = buildDataSourceFactory(true);
        initMediaPlayer();
    }
 
 
    /**
     * 初始化mediaplayer
     */
    private void initMediaPlayer() {
        
            //dash测试流
            Uri mUri = Uri.parse("https://hk.cnv8.tv:9900/dash/vod/dash.mpd");
            //CCTV12
            Uri mUri2 = Uri.parse("http://183.59.160.61:30001/PLTV/88888905/224/3221227483/index.m3u8");
 
            //电信内网CCTV1
            Uri mUri3 = Uri.parse("http://183.59.160.61:30001/PLTV/88888905/224/3221227518/index.m3u8");
 
            TrackSelection.Factory trackSelectionFactory=new AdaptiveTrackSelection.Factory(BANDWIDTH_METER);
 
            DefaultTrackSelector.Parameters trackSelectorParameters = new DefaultTrackSelector.ParametersBuilder().build();
            trackSelector = new DefaultTrackSelector(trackSelectionFactory);
            trackSelector.setParameters(trackSelectorParameters);
            mPlayer= ExoPlayerFactory.newSimpleInstance(this, trackSelector);
            pv_view.setPlayer(mPlayer);
 
            //使用dash的解析库
            dashMediaSource = new DashMediaSource(mUri,mediaDataSourceFactory, new DefaultDashChunkSource.Factory(mediaDataSourceFactory
            ),null,null);
 
            //使用hls解析库
            HlsMediaSource hlsMediaSource = new HlsMediaSource(mUri3, mediaDataSourceFactory, null, null);
            mPlayer.prepare(hlsMediaSource);
            mPlayer.setPlayWhenReady(true); //自动播放
        
    }
 
    private void initView() {
           pv_view=  findViewById(R.id.pv_view);
 
    }
    private DataSource.Factory buildDataSourceFactory(boolean useBandwidthMeter) {
 
        return ((MyApplication) getApplication())
                .buildDataSourceFactory(useBandwidthMeter ? null : null);
    }
    @Override
    protected void onStop() {
        super.onStop();
        releasePlayer();
 
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        releasePlayer();
    }
    /**
     * 释放资源
     */
    private void releasePlayer() {
 
        if(mPlayer!=null){
            mPlayer.release();
            mPlayer = null;
            dashMediaSource = null;
            trackSelector = null;
        }
    }
}

   2.3player的资源释放：

@Override
    protected void onDestroy() {
        super.onDestroy();
        releasePlayer();
    }

   /**
     * 释放资源
     */
    private void releasePlayer() {
 
        if(mPlayer!=null){
            mPlayer.release();
            mPlayer = null;
            dashMediaSource = null;
            trackSelector = null;
        }
    }

2.4 manifest权限添加

<uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

其他：值得注意的是：创建的有些方法是在application里面的:

public class MyApplication extends Application {
    protected String userAgent;
    private Cache downloadCache;
    private static final String DOWNLOAD_CONTENT_DIRECTORY = "downloads";
    private File downloadDirectory;
    @Override
    public void onCreate() {
        super.onCreate();
        userAgent = Util.getUserAgent(this, "ExoPlayer2018");
 
    }
    /** Returns a {@link DataSource.Factory}. */
    public DataSource.Factory buildDataSourceFactory(TransferListener<? super DataSource> listener) {
        DefaultDataSourceFactory upstreamFactory =
                new DefaultDataSourceFactory(this, listener, buildHttpDataSourceFactory(listener));
        return buildReadOnlyCacheDataSource(upstreamFactory, getDownloadCache());
    }
 
    /** Returns a {@link HttpDataSource.Factory}. */
    public HttpDataSource.Factory buildHttpDataSourceFactory(
            TransferListener<? super DataSource> listener) {
        return new DefaultHttpDataSourceFactory(userAgent, listener);
    }
    private synchronized Cache getDownloadCache() {
        if (downloadCache == null) {
            File downloadContentDirectory = new File(getDownloadDirectory(), DOWNLOAD_CONTENT_DIRECTORY);
            downloadCache = new SimpleCache(downloadContentDirectory, new NoOpCacheEvictor());
        }
        return downloadCache;
    }
    private static CacheDataSourceFactory buildReadOnlyCacheDataSource(
            DefaultDataSourceFactory upstreamFactory, Cache cache) {
        return new CacheDataSourceFactory(
                cache,
                upstreamFactory,
                new FileDataSourceFactory(),
                /* cacheWriteDataSinkFactory= */ null,
                CacheDataSource.FLAG_IGNORE_CACHE_ON_ERROR,
                /* eventListener= */ null);
    }
    private File getDownloadDirectory() {
        if (downloadDirectory == null) {
            downloadDirectory = getExternalFilesDir(null);
            if (downloadDirectory == null) {
                downloadDirectory = getFilesDir();
            }
        }
        return downloadDirectory;
    }
}

效果图：

   

  其他资料：

   exoPlayer地址

  exoplayer开发指南翻译

 demo下载