Ogg Vorbis Encoder on ARM

Harold Chu

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Feb 12, 2003, 9:10:52 PM2/12/03

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Hi,

I'm wondering if anyone has tried porting the Ogg Vorbis encoder to
ARM. Has anyone been successful? I understand that the current
implementation uses floating point but I was hoping to see if the
encoder would still be fast enough with fp software emulation. I
guess 1/2 real-time will be sufficently fast on an Xscale 400Mhz.

Any sugguestions will be appreciated.

William Munns

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Feb 13, 2003, 6:11:00 AM2/13/03

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har...@lochard.com.au (Harold Chu) wrote in
news:d4f19476.03021...@posting.google.com:

I suggest that you rewrite the code into Integer mode, an
integer version of mp3 will run as cheaply as 40 Mhz at full
rate.

Will

Klaus Fetscher

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Feb 13, 2003, 11:19:57 AM2/13/03

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Please look to http://www.xiph.org/ogg/vorbis/index.html .

The "Tremor" decoder library, an integer-only, fully Ogg Vorbis
compliant software decoder library is now available under a totally free
BSD-like free software license. Download complete source code as a a
tar.gz format archive, or check out module 'Tremor' from Xiph.Org CVS.

Klaus

Grant Edwards

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Feb 13, 2003, 11:30:34 AM2/13/03

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Does it encode as well?

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Jimmy Lin

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Feb 13, 2003, 8:46:38 AM2/13/03

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Actually, there's alreay an integer implementation of Vorbis namely "Termor"
in Vorbis web site.
You can visit the mailing list for more information.
http://www.xiph.org/archives/tremor/masterindex.html

Jimmy

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Mech

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Feb 15, 2003, 7:48:45 PM2/15/03

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In message <3e4bc82a$0$184$a186...@newsreader.visi.com>,
gra...@visi.com (Grant Edwards) wrote:

[Tremor]

> Does it encode as well?

Not last time I looked.

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Mech

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Feb 15, 2003, 7:49:37 PM2/15/03

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In message <d4f19476.03021...@posting.google.com>,
har...@lochard.com.au (Harold Chu) wrote:

> I'm wondering if anyone has tried porting the Ogg Vorbis encoder to
> ARM.

Yes.

> Has anyone been successful?

A bit. Sometimes it works and gave a working ogg, sometimes it
just crashes.

> I understand that the current implementation uses floating point
> but I was hoping to see if the encoder would still be fast enough
> with fp software emulation. I guess 1/2 real-time will be
> sufficently fast on an Xscale 400Mhz.

Even with a really really fast soft float library, I think
that would be pushing it.

> Any sugguestions will be appreciated.

Try it and see?

Harold Chu

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Feb 16, 2003, 3:05:52 AM2/16/03

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> > Has anyone been successful?
>
> A bit. Sometimes it works and gave a working ogg, sometimes it
> just crashes.
>

> > [snip]

>
> Even with a really really fast soft float library, I think
> that would be pushing it.
>
> > Any sugguestions will be appreciated.
>
> Try it and see?

I only suceeded in compiling the encoder without libfloat. It takes 4
mins to encode a 10s 16bit 16kHz audio file on an Xscale PXA 200MHz.
Would anyone know what performance increase libfloat will have? The
oggenc binary just seg faults on me when compiled with -msoft-float.