Web&TV IG - Cloud Browser TF

03 Feb 2016

See also: IRC log


Louay_Bassbouss, Stefan_Kaiser, Bill_Rose, Bryan_Sullivan, Colin_Meerveld, John_Foliot, Julian_Sitkevich, Nilo_Mitra, Ronen_Mizrahi(Invited_Guest), Yosuke_Funahashi, Kaz_Ashimura, Kumanan_Yogaratnam, Paul_Gausman


<kaz> scribe: Nilo

<kaz> scribenick: NiloMitra


Agenda includes:

1) choose a better time slot of the call ( for Asia participants)

2) Discuss emails from Colin and Louay

3) How to proceed on use cases and architecture


Introduction and roll calls followed

<bryan> hi, this is Bryan from AT&T. We will be following this work as something potentially of use in our TV services e.g. u-Verse and DirecTV. Maybe providing some use cases and requirements as the work proceeds. In a tangential context, we are heavily focused on evolving networks toward cloud deployment (e.g. through NFV) and hosting end-user apps/clients in the

<bryan> cloud is a potential component of that.

John wants accessibility to be met for the cloud browser environment also

he is specifically looking to ensure that people with disabilities can interact with appropriate UIs

Time slot for the call

The time slot issue will be clarified with Entrix (Korea) and a proposal made by Alexandra

Technical discussion approach

Alexandra: Cloud browser is not trivial and a straightforward approach via use cases may not always be appropriate
... From DT perspective, cloud browser is a run time environment that runs in the cloud
... A browser in the network leads to a "UI video", which is the video returned by the cloud browser
... Video and UI Video is sent as one stream, but could also separate these two where the video is returned from the PVR or a CDN
... From IPTV telco perspective, could use the second approach
... Refer to these as the single and double stream, and describe these on the Wiki
... Also define what a Thin client is

<bryan> Is the draft linked to the wiki yet?

John: Question about UI Video - is it the controls like pause, fast forward, or is it interactive menus?

Alexandra: She means both of them. Everything which was executed locally in the device is shifted to the cloud and is executed there just like a standard browser
... The code is executed in the cloud browser and streamed down as the UI video
... She will put some explanations on the Wiki.

<bryan> So interactive elements are not directly handled by the thin client, but in the cloud client, and any correlation to mouse etc position/action is handled by the cloud browser? (requiring a stream of thin client UI events?)

Kaz: We should clarify the policy of queue management during the call - use Q+ to raise your hand
... Do a basic use case to describe what a cloud browser is

Alexandra: The use cases also need a relationship to the architecture, which describe the different approaches to defining a cloud browser
... Work on architecture and use cases in parallel would be her preferred way of working

<Zakim> JF, you wanted to point to MAUR as some UI requirements for Accessibility

<JF> https://www.w3.org/WAI/PF/media-a11y-reqs/#system-requirements

John: Want to point out that when HTML5 was introduced, they dealt with accessibility from both content and system perspective
... It seems like we are creating a cloud media player in the cloud

Coiln: The player in Active Video also does the accessibility functionality also in the cloud

<bryan> So there needs to be an event stream consumable by the cloud client that includes pointer events and also keyboard or any other accessible interface events.

John: the system requirements is agnostic on where the accessibility functionality (e.g., keyboard) is provided. example - using a keyboard where they cannot use point and click
... Build out the solution so that it remains accessible for ALL users

Alexandra: Could it also be a small use case? John: Be happy to build our use cases for accessibility - 4 types: visual, mobility, auditory, cognitive impairments

John: unsure that these 4 user groups can have access

<Zakim> bryan, you wanted to mention the items I noted

Bryan: seems like the user is interacting with a thin client where the user interacts via events (inputs) with the cloud

<JF> +1 to Bryan

Bryan: There should be an appropriate response to all the user inputs from the cloud browser

Nilo: Are thin client and cloud browser equivalent terms?

Alexandra: Cloud browser uses a "zero client" as all STB functions are moved to the cloud. However, certain logics still needed in the STB so that screens can be overlaid

<bryan> Nilo, there could be options as to what types of functionality are supported by the user-side (home or mobile device), and where those functions are implemented (STB, user device, cloud-based client). We would need to drive those things as we get to a more common understanding of the concept and arch options.

<kaz> accessibility use cases

Kaz: Web & TV interest group also worked on accessibility uses cases

Colin's initial concept of Cloud Browsers

Colin was asked to explain his input

<yosuke> https://lists.w3.org/Archives/Public/public-web-and-tv/2016Jan/0005.html

<kaz> Colin's writeup above

<kaz> Colin's diagram

Colin showed a figure. To him, cloud browser is a regular browser living in the cloud environment

Cloud browser is responsible for all accessibility. Example, a keyboard requires all key strokes to be passed to the cloud browser

Out of band media from a PVR is fed to the local run time environment to "mix" with the control stream

John: As we cannot physically wire keyboard, is a companion screen used to connect with the cloud browser

Colin: You could also have the physical keyboard tap into the thin client run time environment

<bryan> Websockets could be a good mechanism for delivery of the signalling events to the cloud browser.

Colin: Several ways are possible to make cloud browser accessible. try to make it as normal as possible, so that the browser does not need to know it is running in the cloud. then most accessibility methods work

bryan: Out of band media means that ti can consume local resources. This needs support for several APIs which may not make this runtime environment "thin"

Colin: try and keep it as thin as possible

Kaz: can we add this figure to the wiki page?

Colin: This is just one of many possible solutions. However, leave it open. this can be a starting point

Alexandra: The group has to define the gaps
... Via use cases.

Colin: The cloud environment sends the UI to the runtime via stream and some sort of signalling is needed for a session setup

<bryan> ... Probably a RESTful API accessed by the thin client and served by the cloud browser would be useful for session management.

Alexandra: Want to discuss in group with a general overview of the arch so that we can discuss the different approaches. The use cases need to take into account the interactions between the cloud browser and the local runtime environment

<bryan> Once a session was started, a websocket connection could be used for signalling and any non-video feedback to the thin client.

Colin: Assume that the stream is a video stream. Alongside a video stream you can also send images. The runtime environment can mix the stream with a series of images

Alexandra: Are these different architectures?
... Where would be the media player be placed? Ina zero clinet, the media player could also be in the cloud.

<bryan> The result of cloud-browser-based dialogs e.g. permissions or other dialogs, would need to be passed back down to the thin client if the client was intended to access local resources. The security of that would be a key consideration...

Colin: In a PVR, you don't send the video to the cloud and then send it back. therefore you need something in the client for out-of-band media.

Alexandra: We don't identify protocols; just the architecture. This will be done afterwards

Bryan: Talk about use cases and requiements, but don't document the architecture options in the use cases and requirements document

Alexandra: Discuss cloud 360 use case

Louay: They have a cloud server which renders a video of just what was requested (e.g, a particular angle)
... Don't stream the whole 360 degree view but just what was requested. Existing JS libraries rendering 360 video need use case to only send just what is requested
... IS this a good use case for the cloud browser?

Alexandra: Make up a couple of use cases and add to the Wiki

Louay: Will do so with more details/diagrams

Alexandra: Will add use cases for the cloud browser on how exisiting use cases work (PVR, interactivity, EPG etc.)

Louay: Want to make sure that their use cases are at the same level as those submitted by others. Their use cases are from an end user perspective, not a systems perspective.

Alexandra: His use case could be for virtual/augmented reality

<kaz> Use Case wiki

Alexandra: Summarizing the meeting.

Kaz: may wish to revisit the template for the use cases. need a motivation field and a Reviewer field

Ronen: We take HTML content that runs in a cloud browser. We need to see ahat types of HTML5 content we have (e.g., EPG) and see what happens if this is not run on a local browser.
... Need to look at OTT content, games etc. Each of these would be a use case.
... Use cases would be on user interaction with these types of applications where the browser is in the cloud - what gaps exist?

Alexandra: Will discuss with Ronen before putting such use cases on the Wiki
... Will also align it with other use cases such as EPG, HbbTV etc.

No further questions or discussion. Meeting closed.

Continue discussions via email.

Summary of Action Items

Summary of Resolutions

[End of minutes]

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