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Hosted Marlin Service - Net TV Example

This is an example application for the Net TV plataform showcasing how to download or stream Marlin DRM videos with Hosted Marlin Service.

This example is not a fully function video webstore (e.g. it doesn't manage users properly nor provides a pretty user interface), it is just a barebone implementation to test Marlin DRM content on a Net TV that you may hack around to integrate in your app. Notice also that the example was tested with a specific Philips Net TV device, so thorough Net TV compliance is absolutely not guaranteed; pull requests and issues are more than welcome of course :)

The server-side of the application (the "webstore", in Marlin-terms) is coded in Ruby using Sinatra, but it should not be necessary to have prevous experience with Ruby nor Sinatra to get it running or to understand what the code does, as it's very simple and quite thoroughly commented.

This example was made following this tutorial.

You can see the example working at http://marlin-nettv-example.heroku.com/ (note that you should visit this link with a Net TV device).

Install & Run

Git clone and install dependencies

This is the typical Ruby-project installation. If you don't have Ruby, I'd recommend installing it with RVM.

# Clone the repo and cd into it.
# Install bundler if you haven't already:
gem install bundler
# Install all the project dependencies:
bundle install

To get the server running you can then do:

rackup

... and you will an instance of the application running at http://localhost:9292. Any change on the code of the application should be seen immediately without the need for restarting the server.

Configure Hosted Marlin Service credentials

To run the application you will need to register in HMS. Do so, and once you are logged in go to the home page and copy the code shown under Customer Authenticator Code into the config.yml file. Your config.yml should look something like:

customer_authenticator: 123,6f5902ac237024bdd0c176cb93063dc4
hms_hostname: ms3-gen.service.hostedmarlin.com

If you have a different HMS provider than hostedmarlin.com, you might change that as well.

To verify that your HMS credentials work properly, you can visit http://localhost:9292/register and see if it returns an XML file (this is a Marlin Bradband Registration transaction token).

Package some content.

This is step is not necessary to get the application running, as it already comes with a couple of very short sample videos taken from the awesome Sintel and Elephants Dream movies.

To encrypt an MP4 video you should use the mp4dcfpackager command as described here. For example:

mp4dcfpackager --method CBC --content-type video/mp4 --content-id urn:marlin:organization:yourorganization:big-buck-bunny --key f7782e51dd43bac40861a4075647e874:00000000000000000000000000000000 big-buck-bunny.mp4 contents/big-buck-bunny.dcf

Then you must also create a contents/big-buck-bunny.yml YAML file, which shoud specify the key used to encript the file so the application can then use it to acquire Marlin Broadband License tokens. The file should look something like this:

---
:key: f7782e51dd43bac40861a4075647e874

You can use the script included in this repository called encrypt-content to generate both the .dcf and .yml files. Notice that the script will require you to have the command mp4dcfpackager in your PATH:

export PATH="$PATH:path/to/hms-tools"
./encrypt-content big-buck-bunny.mp4

You can also pass --key and --id parameters to the script.

The .yml for the content needs to have its cryptographic key, but it can also have the optional fields:

  • id: HMS ID. By default the application will use urn:marlin:organization:example:<filename without extension>
  • title: Content title. Default is the filename without extension.
  • synopsis: Default is title
  • url: The URL where the .dcf file is at. By default is <your app instance base URL>/contents/<filenam without extension>.dcf

Watch the videos on the TV!

Now that you have some videos packaged, you should be able to visit http://localhost:9292/ on your NEt TV device and see a list of available videos with "Download" and "Stream" links. These links should take you to a screen for downloading and watching or directly watching the movie respectively.