[opus] (no subject)

[Brian Silverman]

Thanks for your response (from weeks ago!).

You said real-time performance will hinge on the MULS instruction.  I've
just looked this up, and although the ARM Cortex-M0 has a configurable
1-cycle or 32-cycle MULS, the PSoC developers chose the faster one.  Phew!

>From the PSoC docs:

"32-bit Cortex-M0 CPU with single-cycle multiply delivering up to 43 DMIPS
at 48 MHz"

Thanks for the other pointers, and I'll let you know my results in the
coming weeks when I get back on this.

-- 

Brian Silverman

Ready Set STEM

bri at readysetstem.com

443-850-5351

On Thu, Mar 9, 2017 at 9:44 AM Jean-Marc Valin <jmvalin at jmvalin.ca> wrote:

> Seems like everyone but you got the answer. See the archive:
> http://lists.xiph.org/pipermail/opus/2017-February/003764.html
> You might want to check why your SMTP gateway rejected my original email.
>
> --
>
> Brian Silverman
>
> Ready Set STEM
>
> bri at readysetstem.com
>
> 443-850-5351
>
> On Thu, Mar 9, 2017 at 9:27 AM, Brian Silverman <bri at readysetstem.com>
> wrote:
>
> Hi,
>
> I'm looking a porting the Opus encoder (encoder only) to a Cypress PSoC 4
> (a 32-bit ARM Cortex-M0 with very limited resources), and would like to
> know the feasibility of stripping down the encoder to fit.  I've been
> playing with the encoder configured with "--enable-fixed-point
> --disable-intrinsics".
>
> The end result I'm trying to get to is encoding a single 16kHz 16-bit LPCM
> channel to fit into ~60kbps, and I'd like to encode in real-time or
> better.  The opus_demo compression with default setting is fantastic on my
> test audio - more than 12x, where I only need about 4x.  Hopefully that
> means I have plenty of room to tweak so I can fit it in my limited
> resources.
>
> My resources:
>
>    - 48MHz 32-bit ARM Cortex-M0
>    - 32k RAM (of which I probably on have 16-24k available)
>    - 256k ROM (of which I probably only have 128-196k available)
>
> I have no doubt that I can fit the design in ROM - I've already tried
> ripping out the decoder, and a stripped build can fit in 160k.
>
> But, on speed and RAM, any thoughts on the feasibility, or what I'd have
> to do to make this work?
>
>
> P.S. I sent this to the mailing list before, but I never saw it appear.
> Sorry if this is a duplicate.
>
> --
>
> Brian Silverman
>
> Ready Set STEM
>
> bri at readysetstem.com
> --
> --
>
> Brian Silverman
>
> Ready Set STEM
>
> bri at readysetstem.com
>
> 443-850-5351 <(443)%20850-5351>
>
> _______________________________________________
> opus mailing list
> opus at xiph.org
> http://lists.xiph.org/mailman/listinfo/opus
>
>
> --
-- 

Brian Silverman

Ready Set STEM

bri at readysetstem.com

443-850-5351
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