HTML and CSS Reference
In-Depth Information
Being worked on?
In this appendix?
API functions to capture media from
local devices (camera and micro-
In scope for the Device APIs &
Policy Working Group, experimental
implementations available
Covered in section I.1.1
API functions for encoding and oth-
er processing of those media streams
Not covered
API functions for establishing direct
peer-to-peer connections, including
firewall/NAT traversal
Being worked on at the IETF, exper-
imental implementations available
Discussed in section I.1.2
API functions for decoding and pro-
cessing (including echo canceling,
stream synchronization, and a num-
ber of other functions) of those
streams at the incoming end
Not covered
Delivery to the user of those media
streams via local screens and audio
output devices
Part of the HTML5 specification
work, experimental implementations
Covered in chapter 8
In this section you're going to learn about the experimental implementation for point
2 in table I.1 , getUserMedia() , as well as discuss point 4, which, in concert with
getUserMedia() , will allow the creation of web applications for telephony and video
I.1.1. Grab input with getUserMedia()
The getUserMedia() function allows you to grab a media stream from the user's
device and use it within the browser. The current focus is on audio and video streams,
since the elements to output those already exist in HTML5, but there's no reason why
other sources of data couldn't be accessed in the future and handled with the File API (see
chapter 3 ) or new elements.
Opera, Google, and Mozilla have already implemented a significant chunk of the function-
ality targeted by the working group thanks to getUserMedia() . You will, of course,
need a PC or laptop with a webcam. You could also use your mobile phone or tablet device,
but then you'd need some way of making the files you create on your computer available
over the network your device is on. This might involve setting up a local web server and
possibly fiddling around with your firewall and router settings to allow access to it, or if
you already have a web server online, you could upload your files to that.
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