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Subject: Re: Playback Speed and Wishful Thinking

Re: Playback Speed and Wishful Thinking

From: Linus Nielsen Feltzing <>
Date: Mon, 08 Jan 2007 10:07:18 +0100

Alexandre Enkerli wrote:
> Whether or not timestretching can be done in Rockbox is difficult to
> know as it's done on other platforms. WMP does timestretching with
> MP3s and probably other formats. The iPod's original firmware allows
> for timestretching audiobooks and other M4B content (DRMed or not).
> There might be a technical limitation preventing the Rockbox MP3
> decoder to timestretch but, if it's a common enough idea, a clear
> statement on this impossibility would be useful.

One problem with timestretching is that most of the really good
algorithms are proprietary and there is very little free source code out
there that can be used by Rockbox.

As I said in an earlier email, we have been looking for suitable
algorithms for timestretching, and we believe we have found one. We have
to adapt it to Rockbox and optimize it, and that is not a trivial task.

Received on 2007-01-08

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