Bug 69725 - Ability to play sound reversed (playbackRate to accept negative parameter)
Summary: Ability to play sound reversed (playbackRate to accept negative parameter)
Status: UNCONFIRMED
Alias: None
Product: WebKit
Classification: Unclassified
Component: Web Audio (show other bugs)
Version: 528+ (Nightly build)
Hardware: All All
: P2 Normal
Assignee: Nobody
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2011-10-09 09:18 PDT by Eiji Kitamura
Modified: 2013-06-06 00:36 PDT (History)
5 users (show)

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Description Eiji Kitamura 2011-10-09 09:18:04 PDT 
On HTML5 Audio Element, playbackRate attribute changes speed of sound playback. With negative parameter, it plays reversed.
I'd like to request same functionality on Web Audio API. This enables WAA to emulate scratch noise on turntable.
Comment 1 Chris Rogers 2012-04-18 12:11:16 PDT 
This is for AudioBufferSourceNode
Comment 2 Chris Rogers 2012-04-18 12:16:32 PDT 
Let's try to think how it interacts with the current noteOn() and noteGrainOn() API.  For example, what if we want to play a grain backwards.  Then it will have to start playing back at the end of the grain.  Let's try to make sure we get the API correct before implementing a quick fix.  I think it will be useful, but let's do it right.
Comment 3 Raymond Toy 2012-04-19 16:24:24 PDT 
(In reply to comment #2)
> Let's try to think how it interacts with the current noteOn() and noteGrainOn() API.  For example, what if we want to play a grain backwards.  Then it will have to start playing back at the end of the grain.  Let's try to make sure we get the API correct before implementing a quick fix.  I think it will be useful, but let's do it right.

That would be what I would want and expect with noteGrainOn() and a negative playbackRate: play just the selected grain backwards.
Comment 4 Allen 2012-12-22 22:56:37 PST 
What is the ETA on this feature?  Really need this for rewinding.
Comment 5 boblemarin 2013-02-08 03:45:36 PST 
How can we help to make this bug CONFIRMED ?
It looks pretty clear that it is not working the way we expect it to.
Comment 6 Allen 2013-02-08 03:48:36 PST 
I'd like to know as well.  Currently you can't set video.playbackRate to a negative number.