Vorbis dev - Aug 2005 - Ogg Vorbis on DSP platform?

Hello,

I'd like to develop a codec for the Ogg Vorbis algorithm on a DSP
(controller?) hardware platform.

We've got 2 (3) main applications:
1) the codec should be used for 2 channel simultaneous message
recording/playback on flash EPROM.
2) the codec should be used for streaming audio over IP or Ethernet/intranet
networks.
3) for large system, the PC should serve as a storing device

We are looking for soft- and hardware, we can integrate into our system. Our
system has got a coldfire controller running Linux. On a system bus we are
able to plug in different module like DSP's, ADC's, DAC's, other
controllers
...

Here are some questions:
* What resources do I need in terms of DSP-Power, internal/external memory,
...?
* do I get the source code? (I need to adapt it to my application)
* Are there codecs only for single channels? (I need two independent audio
channels)
* How about streaming software?

Thanks a lot for your answer.

G. Schrutz

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On 7/28/05, Gerold Schrutz <G.Schrutz@idsa.de> wrote:
   
> Here are some questions: 
> * What resources do I need in terms of DSP-Power, internal/external memory,
> ...? 
Are you interested in encoding, or just decoding? Your mail doesn't
make it absolutely clear.

If you're interested only in decoding, then a small amount of memory
is required (I'm not sure, offhand, about code memory. 64 kB of data
RAM should be sufficient, though - more is obviously nicer. For
processing power - well, it depends on your architecture. If you gave
more details, someone might be able to say precisely what speed you'd
need.

For encoding, there's a lot more to be done - there's no existing
fixed-point encoder implementation. Any such implementation would a)
be quite a lot of work, b) require a lot more memory, and c) require a
more powerful cpu.

> * do I get the source code? (I need to adapt it to my application) 
Yes, the source code is freely available. See www.xiph.org/ogg/vorbis,
or if you want the fixed point decoder implementation see
svn.xiph.org/trunk/Tremor (though you may be interested in one of the
tremor branches - a search of the mailing list archives should turn up
details if you are).
> * Are there codecs only for single channels? (I need two independent audio
> channels) 
Of course.
> * How about streaming software? 
xiph.org has icecast, which is a streaming media server.

If you have more questions, feel free to ask!

Mike

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