Mobile/Projects/Screencasting: Project WebRTC video to second screen

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Objectivos

Melhorar as capacidades de multi-ecrã existente no Firefox, permitindo que o conteúdo WebRTC de um dispositivo (por exemplo: telefone ou tablet) seja "projetado" em uma (possivelmente sem cromo) janela com pouco peso do navegador (ou app)em um segundo dispositivo .

Use cases & user stories

Example use cases

• Initiating and controlling a video call from a tablet, but having the incoming video displayed on the TV so the whole family can see. The "calling the grandparents" use case.
• "Social" TV viewing: PIP of one or more video chats with your friends as you’re watching (yelling at the) TV together.

User stories

• When I want to project something to a nearby (and compatible) screen, I want those devices to recognize each other as magically as possible and for set up to be as simple as possible, so setting up a device doesn't interrupt the flow of activity.
• When I want to project something to a nearby screen, I want the process to be as intuitive as possible -- for example: long-tapping an element on my handheld device (ie: the video window of my video call) and either selecting an item from a menu or flicking that element towards the screen in question -- so I don't have to spend a lot of time struggling with opening a session. Opening a projection should not interrupt the flow of activity.
• When I'm finished projecting to the larger screen, I want closing the projection to be as intuitive as possible so I don't get frustrated with the process or accidentally project more than intended to the screen. Closing a projection should not interrupt the flow of activity.
• When I am projecting something to a second screen, I want there to be as little chrome or browser-related UI to be on the large screen, so I am able to focus entirely on the content I'm interested in and that content is as large as possible.
• When I am projecting something to a second screen, I want that content to still be displayed on my handheld device as normal, so using and navigating that content isn't any different than it would be if I weren't projecting to the second screen.
• When I am projecting something to a second screen, I want to be able to control and manipulate that content as normal on my handheld device so using it is no different than it would be if I weren't projecting to the second screen.

Technical specifications

• Should include both Roku and Chromecast support for casting
• Everything else: TBD

UX design

• Not handed off yet
• Related design doc: Firefox on TV Design Principles and Guidelines (P20-25 for design concepts)
• Related concepts:
  • Mirrored display (what you see is what you show)
    • Open local content from mobile device and show it on TV display (pairing to show local photos, videos, music in living room, might use location based sync, NFC, etc)
    • Open online content on mobile and send it to TV display (showing online content like photos, videos, webpages, video calls, etc)
  • Mobile as control device (while TV as display)
    • Content (photos, videos) is shown on TV while control (zoom, pause) is shown on mobile
    • Showing video call on TV (use TV display, camera & speaker while using mobile mic & control)
    • Gaming, TV as display while playing game on mobile (consider also multi-player games)
  • Co-watching a show
    • Co-watching a show on two (or more) remote devices, co-watching while video calling
    • Multiple input devices scenario (karaoke TV playlist)
    • Create and share playlists with friends

Justification

• Unique feature offering with strong user benefit.

Quality criteria

• No user-perceptible performance degradation
• All goals are met
• All user stories are implemented & tested