ExoPlayer - 在SD卡中播放本地mp4文件 [英] ExoPlayer - play local mp4 file in SD card

问题描述

我正在使用Exoplayer演示应用，并希望从SD卡预加载MP4视频。
我已经尝试过这篇文章，但它不起作用。在我的exoplayer Demo中没有名为DemoUtil.java的类。
改为使用：

I am using the Exoplayer Demo app and want to preload a MP4 video from SD card. I have tried out the implementation from this post, but it does not work. There is no such class called DemoUtil.java in my exoplayer Demo. Instead used:

public static final Sample[] LOCAL_VIDEOS = new Sample[] {
new Sample("Some User friendly name of video 1",
"/mnt/sdcard/video1.mp4", Util.TYPE_OTHER),
};

我也无法使用他们为SampleChooserActivity.java提到的代码片段。 （保留给我错误）

I also could not use the their snippet of code mentioned for SampleChooserActivity.java. (Kept giving me errors)

我改为使用：

group = new SampleGroup("Local Videos");
group.addAll(Samples.LOCAL_VIDEOS);
sampleGroups.add(group);

我做错了什么？每个设备的文件路径是否都会更改？

What am I doing wrong? Does the path of the file change for every device?

推荐答案

没有尝试过演示应用，但我已设法创建我自己播放本地音频文件的示例并在此处发布：
https://github.com/nzkozar / ExoplayerExample

Haven't tried the demo app, but I have managed to create my own example of playing local audio files and have posted it here: https://github.com/nzkozar/ExoplayerExample

以下是从文件Uri准备播放器的所有工作的主要部分：

Here is the main part that does all the work of preparing the player from a file Uri:

private void prepareExoPlayerFromFileUri(Uri uri){
        exoPlayer = ExoPlayerFactory.newSimpleInstance(this, new DefaultTrackSelector(null), new DefaultLoadControl());
        exoPlayer.addListener(eventListener);

        DataSpec dataSpec = new DataSpec(uri);
        final FileDataSource fileDataSource = new FileDataSource();
        try {
            fileDataSource.open(dataSpec);
        } catch (FileDataSource.FileDataSourceException e) {
            e.printStackTrace();
        }

        DataSource.Factory factory = new DataSource.Factory() {
            @Override
            public DataSource createDataSource() {
                return fileDataSource;
            }
        };
        MediaSource audioSource = new ExtractorMediaSource(fileDataSource.getUri(),
                factory, new DefaultExtractorsFactory(), null, null);

        exoPlayer.prepare(audioSource);
    }

你可以得到这样的Uri： Uri。 fromFile（file）

You can get the Uri like this: Uri.fromFile(file)

如上所示准备好文件进行播放后，只需要调用 exoPlayer .setPlayWhenReady（true）; 开始播放。

After you have prepared your file for playback as shown above, you only need to call exoPlayer.setPlayWhenReady(true); to start playback.

对于视频文件，您可能只需要将表面视图附加到exoPlayer对象，但我还没有用ExoPlayer2做到这一点。

For a video file you'd probably only need to attach a surface view to your exoPlayer object, but I haven't really done this with ExoPlayer2 yet.

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