[opus] Using opus on ATMEL 32-bit RISC microcontroller

[Amit Ashara]

Hello Daniele

It would be worthwhile to attach an external serial flash or USB thumb
drive, if the intent is store data. This allows for far more flexibility in
storage

Regards
Amit

On Fri, Aug 26, 2016 at 11:02 AM, Jean-Marc Valin <jmvalin at jmvalin.ca>
wrote:

> On 26/08/16 11:40 AM, Daniele Barzotti wrote:
> > You're right! I forgot to say that I need only the encoder side (and
> > only for voice).
>
> Then you can remove all of the decoder. As for the encoder, it depends
> on the bitrate and sampling rate you want (more below).
>
> > My application have to acquire a 16bit 8KHz PCM stream and save a
> > compressed audio into a flash.
>
> Sounds like a job for SILK-only mode. In which case you can strip away
> all of CELT.
>
> > (And here I have another little question...
> > My flash size is 8Mb only and I have to be able to store in it 8 hours
> > of voice, do you think opus shrink the stream enoguht?)
>
> This is going to be a problem. Assuming you mean 8 mega*byte* (and not 8
> megabit), that's still only 2 kilobit/second. Opus pretty much requires
> 8 kb/s, so 4 times what you have. The only codec I know that can do 2
> kb/s with reasonable quality is codec2, and the implementation is
> floating point.
>
> > Since I'm using FIXED_POINT, I have to pass also --disable-float-api?
>
> Yes. The normal API has calls with both int and float, so if you compile
> with FIXED_POINT, the float calls do a conversion to int before using
> int internally. If you disable the float API, these functions are not
> compiled at all, saving a few bytes.
>
> Cheers,
>
>         Jean-Marc
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