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Update media time usage for remote playback protocol. #328

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merged 3 commits into from
May 31, 2024

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@markafoltz markafoltz commented Feb 28, 2024

Addresses and closes Issue #327: Representation of time in remote-playback-state

The current spec uses the per-frame media synchronization timestamps to control and update the media playback state and handle other time specific fields. This has a few issues:

  1. The media start date is defined as milliseconds since the epoch (1/1/1970 00:00), not anything related to a specific media playback.
  2. Other media times are all defined as floating point seconds on the media timeline.
  3. Only media playbacks that use streaming (instead of just sending a URL) will use the media synchronization time at all.

Therefore, to align with HTML, we just convert time fields to correspond to the types that are exposed in script on media elements, so that agents don't have to translate to/from media synchronization time. (For cases where conversion is necessary, I added an appendix with a formula to do that.)

The protocol also used "unknown" to represent an unknown value, which does not have meaning in CBOR or CDDL. This PR also updates the protocol to use CBOR null instead which is a primitive value in CBOR.


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@markafoltz markafoltz linked an issue Feb 28, 2024 that may be closed by this pull request
@markafoltz markafoltz requested a review from baylesj February 28, 2024 23:30
@markafoltz markafoltz self-assigned this Feb 28, 2024
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@markafoltz markafoltz merged commit 4a988e3 into main May 31, 2024
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@markafoltz markafoltz deleted the issue-327-time branch May 31, 2024 23:13
github-actions bot added a commit that referenced this pull request May 31, 2024
SHA: 4a988e3
Reason: push, by mfoltzgoogle

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Representation of time in remote-playback-state
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