W3C home > Mailing lists > Public > public-media-capture@w3.org > August 2012

Describing recording by means of the Media Source interface

From: Harald Alvestrand <harald@alvestrand.no>
Date: Thu, 23 Aug 2012 13:16:49 +0200
Message-ID: <50361121.60609@alvestrand.no>
To: "public-media-capture@w3.org" <public-media-capture@w3.org>
I'm scanning the Media Source interface, and seeing how it describes 
data formats for the buffers it uses.

It seems to me logical to describe the recording interface in such a way 

If there exists a video stream v, a media source msrc and a media stream 
ms, and (conceptually) msProducesData(buffer) is called every time data 
is available at the recording interface,
then the following code:

// Setup
v.src = window.URL.createObjectURL(msrc);
buffer = msrc.addSourceBuffer(mimetype)
// So far unknown setup for the recorder interface

// playback
msProducesData(data) {

should produce the same display (possibly somewhat delayed due to 
buffering) as

v.src = window.URL.createObjectURL(ms)

The media source definition is available here:


It seems to me that if we can make sure this actually works, we'll have 
achieved a little consistency across the media handling platform.

Received on Thursday, 23 August 2012 11:17:25 UTC

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