Agenda Items / Topics

• Status of Tracks
• Update on Buffering & LayoutTests
• Status of MediaPlayer{QTKit,AVFoundation,GTK}.
• Media Source
• Encrypted Media W3C Spec
• WebAudio

Tracks

Eric Carlson :ericc

• W3C spec is mostly implemented
  • Unimplemented:
    • Rendering
    • word-wrapping (unsettled in the W3C spec)
    • native controls do not yet control TextTracks (selection, enabling, etc.)
  • Implemented:
    • Basic rendering
    • Basic functionality
  • Available in WebKit nightlies behind a runtime flag
  • IE10 has implemented it as well
    • Only basic rendering
  • ​http://www.html5rocks.com/en/tutorials/track/basics/

Update on Buffering & LayoutTests

Andrew Scherkus :scherkus

• In the last year
  • Bug fixes
  • HTTP Media Layout Tests for handling a variety of Servers
    • e.g. Buggy support of Range Requests
    • Edge cases of server support
  • Should these layout tests be in http/tests/media, or in an alternate test suite?
    • ericc: would love to have these tests checked in
  • What should these tests assert?
    • buffered attribute?
    • seekable attribute?
• Resource Loader changes
  • Chromium: AssociatedURLLoader
• URLs
  • [Media HTTP Layout Tests](​https://bugs.webkit.org/show_bug.cgi?id=84365)

Status of MediaPlayer{QTKit,AVFoundation,GTK}

Alexis Menard :darktears

• Qt currently uses MediaPlayerPrivateQTKit
• AVFoundation is the future media framework on Mac platform
• CALayers:
  • Qt does not currently support Accelerated Compositing
  • MPPQTKit & MPPAVFoundation makes assumptions about the type of PlatformLayer
  • MPPAVFoundation is separated into an ObjectiveC and a C++ implementation
    • Beneficial for Qt port.
• MPPGTK
  • used in the three ports
  • upcoming work:
    • accelerated decoding and rendering
    • currently works both on WebKit & WebKit2.
    • should GTK adopt the Media Source API?

Media Source API

Aaron Colwell

• proposed to the W3C
• primary use case is adaptive streaming
• most recent spec is an upgrade to the original, simpler spec.
• Currently updating WebKit to match the new spec
• Support both WebM and ISO (MP4) formats.
• Want to migrate code from the Chrome port into WebKit
• URLs:
  • [w3c spec](​http://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html)
• W3C spec level of support
  • generally -> :-)
  • Microsoft, specifically, is interested in making this work in IE

Encrypted Media W3C Spec

David Dorwin :ddorwin

• Background
  • Published the Encrypted Media Extensions proposal to the W3C
  • Pages pass in keys to encrypted content through JavaScript
  • Generally controversial(!!) on the W3C list
• Hope to move forward
  • Technical Feedback
  • Began filing bugs on W3C Tracker
  • W3C Task force in the work
• As of today, Chromium builds include basic support for Encrypted Media spec
  • LayoutTests currently pass on Chromium port
• Questions
  • Is it generic encrypted content or specific to video/audio.
    • functions exist on the media element; not usable for image content, e.g.
    • this question will be discussed in the WG.
  • There is also the Crypto API, related but not a replacement for this one
• URLs:
  • [w3c spec](​http://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-media/encrypted-media.html)

WebAudio API

Jer Noble :jernoble

• Background on WebAudio API, spec, and implementation
• GTK is working on implementing this API
• Mozilla has completely separate approach
  • entirely in JavaScript
  • performance issues
  • extended the MediaStream API to process streams of audio data in WebWorkers

Full Screen

Jer Noble :jernoble

• Spec has recently been changed in order to create a new, explicit stacking content for full screen'd elements
• Will be merged in with <dialog>

Media Statistics

Andrew Scherkus :scherkus

• Only generally useful stat: Dropped frames
• Topic for Deprecation Session.