Rockbox mail archiveSubject: Re: wav codec (was Re: Rockbox version 2.5 released)
Re: wav codec (was Re: Rockbox version 2.5 released)
From: BlueChip <cs_bluechip_at_webtribe.net>
Date: Sat, 24 Sep 2005 09:33:54 +0100
> > So am I correct in saying that what we have is the official PCM codec and
> > NOT the 3587 documentation (and hence our own implementation of a PCM
> > codec)?
First off - please excuse my manners - thank you for uploading the docs :)
>This is the codec as used in the AV models. It was developed by Micronas for
Oh! Brilliant :))
>We don't have means to write our own software for the MAS, if this is what
Yes, it was.
>Unless you learn enough from that binary blob to empower
>yourself. It's said to be a real tricky beast to program,
I got a fair chunk of the instruction set decoded with what we had before -
although I would have to start again from scratch as I recall next-to
But as you say, the instruction set is <50% of the problem - the next
headache is understanding the hardware - and having seen intel and motorola
documentation from PDF guides through to the black/yellow ones - even if we
had the docs, we could still be in for a rough ride implementing ADPCM or
>with strange hardware features. These were necessary back then to implement
>an mp3 codec on such a comparatively weak DSP.
Hmmm, yes, that makes a lot fo sense - mind you, would we use the weirdness.
Well, anyway, the future is the future. We have now proven that "The
impossible we can do [miracles take a little longer]" ...So whatever the
future holds, having WAV support has IMMENSE ramifications.
I once more congratulate you on perservering with this - I really never
thought we would succeed in procuring signatures at a sufficiently high level.
>Yet missing part on Rockbox is to use the codec, of course.
Yeah, but that's the simple bit ...in comparison (by about 10e9)
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Received on 2005-09-24