从字符串创建MPD文件 [英] Create MPD file from String

问题描述

我设法创建了一个MPD文件，当通过URL将其馈送到 ExoPlayer 2.6.0 时，该文件可以完美播放(该MPD托管在测试服务器中).

I've managed to create a MPD file that is perfectly playable when fed to ExoPlayer 2.6.0 via an URL (the MPD is hosted in a testing server).

但是，我需要在Android中创建此MPD文件并将其提供给ExoPlayer，而无需向服务器请求该文件.到目前为止，我已经尝试理解DashManifest& DashManifestParser没有成功.有什么想法如何在Android中创建文件并将其直接提供给ExoPlayer吗?

However, I need to create this MPD file in Android and feed it to ExoPlayer without requesting the file to the server. So far I've tried to understand the classes DashManifest & DashManifestParser with no success. Any ideas how to create the file in Android and feed it directly to ExoPlayer?

推荐答案

播放DASH流时，您需要创建DashMediaSource.Factory.第一个参数是DashChunkSource，它读取清单定义的媒体文件.第二个参数是用于读取清单的DataSource.Factory.

When playing an DASH stream you need to create a DashMediaSource.Factory. The first parameter is the DashChunkSource which reads the media files defined by your manifest. The second parameter is the DataSource.Factory to read the manifest.

因此，您需要提供一个DataSource.Factory，它创建一个DataSource来读取清单.请参见以下代码段中的manifestDataSourceFactory:

So you need to provide a DataSource.Factory which creates a DataSource to read your manifest. See the manifestDataSourceFactory in the snippet below:

DashMediaSource.Factory dashMediaSourceFactory = new DashMediaSource.Factory(
        new DefaultDashChunkSource.Factory(mediaDataSourceFactory),
        manifestDataSourceFactory);
dashMediaSourceFactory.createMediaSource(manifestUri);

a)本地磁盘上的静态mpd

如果清单存储为本地文件，则可以使用DefaultDataSourceFactory并将文件路径作为manifestUri传递:

If your manifest is stored as a local file you can use a DefaultDataSourceFactory and pass the file path as the manifestUri:

DataSource.Factory manifestDataSourceFactory = new DefaultDataSourceFactory(context, userAgent);

b)内存清单

如果清单在内存中，则可以为ByteArrayDataSource提供一个自定义DataSource.Factory:

If your manifest is in memory you can provide a ByteArrayDataSource with a custom DataSource.Factory:

DataSource.Factory manifestDataSourceFactory = new DataSource.Factory() {
    @Override
    public DataSource createDataSource() {
        return new ByteArrayDataSource(manifestString.getBytes());
    }
};

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