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Let’s dive into Exo-Participant (Half V): How offline obtain works | by Prateek Batra | March 2023

With the rise in video consumption utilization and information demand, the demand for offline video viewing additionally will increase. Customers can watch their downloaded movies even when they’re offline like when they’re on an airplane or in locations with low web connection whereas offering a safe solution to entry and stop for dwell video saved completely on the person’s reminiscence.

With Google ExoPlayer we are able to simply add the power to obtain media (m3u8) for offline playback
Right here we hold the movies within the system cache as an alternative of downloading the entire file and all these block arrays are mapped to the URL of the video
Instance URL = [c1,c2,c3,c4…]

Now, at any time when Exoplayer tries to entry this video URL, it may be delivered straight through the URL through Community Name or we are able to use the video clips we obtained to stream the video there with none buffer price i.e Streaming playback
Many apps, together with Netflix, Amazon Prime Video, and YouTube, work utilizing a really comparable approach.

Overview of how ExoPlayer Offline Obtain works
  • Obtain Service: That is the default obtain service bundled with Exoplayer performing as a wrapper DownloadManager and ahead instructions to it. As well as, this service helps to maintain the ExoPlayer Obtain operating even when the applying is within the background.
  • Obtain supervisor: Because the title suggests, it is a assist supervisor Handle a number of downloads, obtain and retailer obtain standing, begin and cease downloads
  • HTTP information supply: That is an interface that helps to obtain media content material from a URI (information supply) served over an HTTP connection
  • Cache: When the obtain supervisor specified above downloads any chunk of information i.e. video content material, it’s saved contained in the system cache utilizing Buffer information supply

For the essential setup, you’ll be able to comply with Half 1:

Demo repo

Excessive stage stream for offline obtain

As proven within the above course of we’re utilizing numerous lessons to assist obtain movies offline i.e.

Obtain the tracker: It’s a multi-utility layer that wraps on prime of ExoPlayer Obtain Supervisor & Obtain Service, it additionally helps to deal with, monitor and handle any form of obtain exercise i.e.

  • Begin/Cease Obtain
  • Observe each obtain offline
  • Question Content material (In Progress/Downloaded)

Obtain Dialog Helper: It is a wrapper inside ExoPlayer’s Inside Obtain Helper accountable for

  • Initializing and deleting downloads.
  • Extract monitoring data from media
  • Shows the Choice menu for downloading media tracks
  • Generate obtain requests based mostly on chosen tracks.

Observe choice dialog: It is a Obtain Dialog Pop-up exhibiting the person the choice to decide on which Video & Audio Tracks to obtain

Offline obtain service: It is a wrapper on the unique ExoPlayer DownloadServicehelps to handle all Exoplayer obtain actions ie

  • Begin/Cease Obtain
  • Pause/Resume Obtain
  • Delete Downloads
  • Monitor/Present Standing (through notifications) of an ongoing obtain

Terminal Standing Message Helper: It is a helper to watch obtain standing, notify at any time when obtain standing modifications together with this helper to inform person by way of obtain progress notification with assist belong to OfflineDownloadService

We’d like to verify so as to add all this boilerplate code because it must be added so as to add offline assist obtain Reference code under 👇

Begin/Cease Obtain

This methodology is a part of Obtain the tracker assist begin/cease any obtain

Inside these strategies proceed to make use of the

  • Obtain service: To delete a downloaded media merchandise
  • Obtain the Dialog Helper: To provoke a brand new obtain as talked about above, this helper initiates the obtain course of, Extracts the observe data and shows it as a dialog submit by way of which the person can chosen music will be downloaded

Play downloaded content material offline

The tactic is to initialize the ExoPlayer to play the multimedia content material we downloaded earlier. Right here Obtain Tracker helps to get obtain request for media we downloaded utilizing video URL and furthermore that obtain request is used to generate media supply and we use information supply whether or not cache to fetch downloaded content material from cache

Some further ideas?

There are a lot of configurations and in-depth testing that may be achieved with this. Here is a primary implementation of learn how to obtain an offline video and play it.
Let me know within the feedback the way you labored on ExoPlayer and its different nice options.

Thanks for studying, keep tuned for excellent articles!

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Updated: March 29, 2023 — 7:47 am

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