Investigate Exoplayer DownloadManager

[StaehliJ]

As a user I want to download my content to play it later.

Acceptance criteria

• Progressive media can be downloaded
• Adaptative stream can be downloaded (HLS, DASH)
• DRM content can be downloaded
• Add UI to download content inside the demo

Tasks

• Add button to toggle download
• Implements DownloadService
• Investigate OfflineLicenseHelper

[StaehliJ]

DownloadManager doesn't download MediaMetadata it download only streams files. DownloadManager downloads:

• 1 video track
• 1 audio track
• Multiple text track

The tracks to download have to be specified by integrators or user.

DownloadManager work well with SRG content but the play doesn't know how to play such content (uri= https://mediacomposition?urn...). So maybe we should download as well MediaComposition or at least metadata.

We should make Asset downloadable and not only the streams.