Add media browser support to dlna_dmr

[chishm]

Proposed change

Uses media_source to browse any available source, including local files and DLNA Media Servers (when support is added in a future PR).

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request: dlna_dmr: Document ability to browse and play media home-assistant.io#21619

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

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[probot-home-assistant]

Hey there @StevenLooman, mind taking a look at this pull request as it has been labeled with an integration (dlna_dmr) you are listed as a code owner for? Thanks!
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[StevenLooman]

LGTM. Expected this to be more code, but glad hass already provides the infrastructure.

[chishm]

LGTM. Expected this to be more code, but glad hass already provides the infrastructure.

Thanks :) Some of the features in hass that this uses (like content_type filters and URL signing) were only very recently added (e.g. #64641 and #66120).

The DLNA Digital Media Server side of things is being done in a separate PR (#66437). That's where the bulk of the effort is.

[balloob]

Can you use isinstance to detect if you're browsing UPNP media?

[chishm]

I could (and did originally), but that then needs an explicit import of the dlna_dms component, and therefore a dependency within the dlna_dmr manifest. This current approach is also a bit more flexible because it can handle other integrations extending PlayMedia with a didl_metadata attribute, and they don't have to depend on dlna_dms for it to work.

This has also led me to think about how media sources can provide metadata to media players more generally. I'll work up an architecture discussion for that next week.

[balloob]

Nice! 🎉 1 tiny comment left.