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

[Amit Ashara]

Hello Jean-Marc,

I ran the OPUS compile in my project which uses both encoder and decoder
instances with the SMALL_FOOTPRINT define. The resulting image had a
reduction of ~6.2KB

Regards
Amit

On Fri, Aug 26, 2016 at 11:40 AM, Daniele Barzotti <
daniele.barzotti at eurocomtel.com> wrote:

> Hi all,
>
> thanks a lot for your replies!
>
> Sorry for my typo, the flash size is 8MB (Byte) :-)
> Unfortunately I cannot use another flash because I'm working on a
> proprietary board.
>
> Jean-Marc, thanks for your suggestions.
> I thought to use fixed point for convenience, but I can work on floating
> point too, so I will take in account the codec2 (I didn't know it).
>
> Moreover, if you all have other suggestions to give me I appreciate! ;-)
>
> Cheers,
> Daniele.
>
>
>
> Il 2016-08-26 18:12 Amit Ashara ha scritto:
>
>> 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
>>>
>>> _______________________________________________
>>> opus mailing list
>>> opus at xiph.org
>>> http://lists.xiph.org/mailman/listinfo/opus [1]
>>>
>>
>>
>>
>> Links:
>> ------
>> [1] http://lists.xiph.org/mailman/listinfo/opus
>>
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