在 ExoPlayer 中使用缓存 [英] Using cache in ExoPlayer

问题描述

我正在寻找在 ExoPlayer 中实现缓存的任何示例.

I'm looking for any example of implementing cache in ExoPlayer.

ExoPlayer 在它的库中有关于缓存的不同类，谷歌在这个视频中解释了我们可以用CacheDataSource 类，但 Google 没有提供任何演示.不幸的是，这看起来使用起来很复杂，所以我目前正在寻找示例(在 Google 上没有成功).

ExoPlayer has in its library different classes concerning cache and Google explain in this video that we can implement it with the CacheDataSource class, but Google doesn't provide any demo on it. Unfortunately this seems pretty complicated to use, so I'm currently looking for examples (no success on Google).

有没有人成功或有任何有用的信息?谢谢.

Does anyone succeed or has any info that would help ? Thanks.

推荐答案

这里是ExoPlayer 2的解决方案.+

Here is the solution for ExoPlayer 2.+

创建自定义缓存数据源工厂

Create a custom cache data source factory

public class CacheDataSourceFactory implements DataSource.Factory {
    private final Context context;
    private final DefaultDataSourceFactory defaultDatasourceFactory;
    private final long maxFileSize, maxCacheSize;

    public CacheDataSourceFactory(Context context, long maxCacheSize, long maxFileSize) {
        super();
        this.context = context;
        this.maxCacheSize = maxCacheSize;
        this.maxFileSize = maxFileSize;
        String userAgent = Util.getUserAgent(context, context.getString(R.string.app_name));
        DefaultBandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
        defaultDatasourceFactory = new DefaultDataSourceFactory(this.context,
                bandwidthMeter,
                new DefaultHttpDataSourceFactory(userAgent, bandwidthMeter));
    }

    @Override
    public DataSource createDataSource() {
        LeastRecentlyUsedCacheEvictor evictor = new LeastRecentlyUsedCacheEvictor(maxCacheSize);
        SimpleCache simpleCache = new SimpleCache(new File(context.getCacheDir(), "media"), evictor);
        return new CacheDataSource(simpleCache, defaultDatasourceFactory.createDataSource(),
                new FileDataSource(), new CacheDataSink(simpleCache, maxFileSize),
                CacheDataSource.FLAG_BLOCK_ON_CACHE | CacheDataSource.FLAG_IGNORE_CACHE_ON_ERROR, null);
    }
}

和玩家

BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
TrackSelection.Factory videoTrackSelectionFactory =
        new AdaptiveTrackSelection.Factory(bandwidthMeter);
TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);

SimpleExoPlayer exoPlayer = ExoPlayerFactory.newSimpleInstance(this, trackSelector);
MediaSource audioSource = new ExtractorMediaSource(Uri.parse(url),
            new CacheDataSourceFactory(context, 100 * 1024 * 1024, 5 * 1024 * 1024), new DefaultExtractorsFactory(), null, null);
exoPlayer.setPlayWhenReady(true); 
exoPlayer.prepare(audioSource);

效果很好.

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