I mainly see two issues with doing a fixed-point port of codec2:
1) It's hard to find people who can write a *good* fixed-point and in
general it's much harder for someone other than the original creator of
the algorithm to do the fixed-point.
2) Writing the fixed-point before the float is complete can be cause
maintenance headaches. Using dual fixed/float macros like I used for
Speex/Opus can help there, but it means it has to be done by the
original author or otherwise with very close communication (to avoid
breaking the fixed-point during development).
Considering these, it doesn't seem to me like a good idea to go with a
fixed-point version of codec2 at this point unless there's overwhelming
demand for it.
Jean-Marc
On 13-03-02 03:22 PM, David Rowe wrote:
> Hello Samuel,
>
> Actually there are $3 32-bit microprocessors with floating point, and
> many embedded processors (e.g. those used in android phones) no have
> FPUs. So I think the need for fixed point is diminishing, its only a
> few thousand more transistors on a chip, Moores law etc.
>
> A year ago I worked up an estimate for the labour reqd for a fixed point
> port - it was about $80k.
>
> Cheers,
>
> David
>
> On Sat, 2013-03-02 at 09:01 +0000, Samuel Hunt wrote:
>> I can see turning Codec2 into Fixed point would have huge advantages for
>> opening up things like dsPIC devices, etc, and would be needed to take
>> Codec2 onto the next level.
>>
>> I have huge hopes for Codec2, but without it being possible to compile
>> it into a dsPIC or similar, it is somewhat limited to either having a
>> very expensive processor (relative to cheaper ones anyway!) or consigned
>> to somewhere where there is a PC.
>>
>>
>> What sort of money are we talking about, if the work is to be paid for?
>>
>> It would be interesting to list out all the areas which require
>> development. I notice a few listed on the website, generally relating to
>> quality, etc, but if money would help to accelerate these, it would be
>> nice to look at.
>>
>>
>>
>> Perhaps then we can find people to put the required money in to do
>> development in areas which most interest them?
>>
>>
>> Only a thought.
>>
>> Samuel Hunt
>>
>>
>> On 01/03/2013 21:30, freetel-codec2-requ...@lists.sourceforge.net wrote:
>>> Send Freetel-codec2 mailing list submissions to
>>> freetel-codec2@lists.sourceforge.net
>>>
>>> To subscribe or unsubscribe via the World Wide Web, visit
>>> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>>> or, via email, send a message with subject or body 'help' to
>>> freetel-codec2-requ...@lists.sourceforge.net
>>>
>>> You can reach the person managing the list at
>>> freetel-codec2-ow...@lists.sourceforge.net
>>>
>>> When replying, please edit your Subject line so it is more specific
>>> than "Re: Contents of Freetel-codec2 digest..."
>>>
>>>
>>> Today's Topics:
>>>
>>> 1. Re: Codec2 on asterisk is latest version? (David Rowe)
>>> 2. codec2 float to fixed ( ???? )
>>> 3. Re: codec2 float to fixed (Bruce Perens)
>>> 4. Re: codec2 float to fixed (Andreas Weller)
>>> 5. Changing the Sample Rate (Daniel Mundall)
>>> 6. Re: Changing the Sample Rate (Bruce Perens)
>>> 7. Re: Changing the Sample Rate (Daniel Mundall)
>>>
>>>
>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Wed, 27 Feb 2013 06:16:27 +1030
>>> From: David Rowe <da...@rowetel.com>
>>> Subject: Re: [Freetel-codec2] Codec2 on asterisk is latest version?
>>> To: freetel-codec2@lists.sourceforge.net
>>> Message-ID: <1361907987.3311.99.camel@bear>
>>> Content-Type: text/plain; charset="UTF-8"
>>>
>>> Hi Roberto,
>>>
>>> Nope, just the source code. I'd start by working towards getting two
>>> asterisk boxes to talk Codec 2. If you roll back your codec2-dev to the
>>> SVN version for which the Asterisk patches were generated it might work.
>>>
>>> - David
>>>
>>> On Tue, 2013-02-26 at 02:07 -0300, Roberto Carballa wrote:
>>>> Hi Bruce/David,
>>>>
>>>>
>>>> Thanks, for some reason I did not receive the digest.
>>>> Im not very used to do this, is there any guideline somewhere
>>>> on how to update the asterisk version?
>>>>
>>>>
>>>> Thanks,
>>>> Roberto
>>>> Bruce Perens Fri, 22 Feb 2013 16:35:36 -0800
>>>>
>>>>
>>>>
>>>> In codec2-dev, not codec2. That could confuse people.
>>>>
>>>> Thanks
>>>> Bruce
>>>>
>>>> On 02/22/2013 04:33 PM, David Rowe wrote:
>>>>> Hello Robert,
>>>>>
>>>>> The latest version is what's in Codec 2 SVN.
>>>>
>>>> ------------------------------------------------------------------------------
>>>> Everyone hates slow websites. So do we.
>>>> Make your web apps faster with AppDynamics
>>>> Download AppDynamics Lite for free today:
>>>> http://p.sf.net/sfu/appdyn_d2d_feb
>>>> _______________________________________________ Freetel-codec2 mailing
>>>> list Freetel-codec2@lists.sourceforge.net
>>>> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>>>
>>>
>>>
>>>
>>> ------------------------------
>>>
>>> Message: 2
>>> Date: Thu, 28 Feb 2013 14:05:06 +0800
>>> From: " ???? " <496623...@qq.com>
>>> Subject: [Freetel-codec2] codec2 float to fixed
>>> To: " freetel-codec2 " <freetel-codec2@lists.sourceforge.net>
>>> Message-ID: <tencent_17b48fe44eaaef7632c86...@qq.com>
>>> Content-Type: text/plain; charset="gb18030"
>>>
>>> i recently compiled codec2 for a S3C2440 board,which has no fpu,the
>>> encode/decode speed is very slow.
>>>
>>>
>>> and i also planted speex on my board,
>>> when compiled without --enable-fixed-point,the encode/decode speed is very
>>> slow;
>>> but compiled with option --enable-fixed-point,the encode/decode speed is ok;
>>>
>>>
>>> so i wonder if codec2 has an --enable-fixed-point option when compile ;
>>> if codec2 doesn't has this option,what can i do ? go deep in the source
>>> code and convert the float to fixed?? that's difficult
>>> -------------- next part --------------
>>> An HTML attachment was scrubbed...
>>>
>>> ------------------------------
>>>
>>> Message: 3
>>> Date: Wed, 27 Feb 2013 22:15:32 -0800
>>> From: Bruce Perens <br...@perens.com>
>>> Subject: Re: [Freetel-codec2] codec2 float to fixed
>>> To: freetel-codec2@lists.sourceforge.net
>>> Message-ID: <9551d1c4-0538-4cc7-a0e9-c88d8abaf...@email.android.com>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> Jean-Marc Valin created a set of macros that use float or fixed-point in
>>> Speex. We have not adapted Codec2 to use any form of fixed-point arithmetic
>>> yet. I think David would like to find someone to pay for the work.
>>>
>>> "????" <496623...@qq.com> wrote:
>>>
>>>> i recently compiled codec2 for a S3C2440 board,which has no fpu,the
>>>> encode/decode speed is very slow.
>>>>
>>>>
>>>> and i also planted speex on my board,
>>>> when compiled without --enable-fixed-point,the encode/decode speed is
>>>> very slow;
>>>> but compiled with option --enable-fixed-point,the encode/decode speed
>>>> is ok;
>>>>
>>>>
>>>> so i wonder if codec2 has an --enable-fixed-point option when compile ;
>>>> if codec2 doesn't has this option,what can i do ? go deep in the
>>>> source code and convert the float to fixed?? that's difficult
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>> ------------------------------------------------------------------------------
>>>> Everyone hates slow websites. So do we.
>>>> Make your web apps faster with AppDynamics
>>>> Download AppDynamics Lite for free today:
>>>> http://p.sf.net/sfu/appdyn_d2d_feb
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>> _______________________________________________
>>>> Freetel-codec2 mailing list
>>>> Freetel-codec2@lists.sourceforge.net
>>>> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Everyone hates slow websites. So do we.
>> Make your web apps faster with AppDynamics
>> Download AppDynamics Lite for free today:
>> http://p.sf.net/sfu/appdyn_d2d_feb
>> _______________________________________________
>> Freetel-codec2 mailing list
>> Freetel-codec2@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>
>
>
> ------------------------------------------------------------------------------
> Everyone hates slow websites. So do we.
> Make your web apps faster with AppDynamics
> Download AppDynamics Lite for free today:
> http://p.sf.net/sfu/appdyn_d2d_feb
> _______________________________________________
> Freetel-codec2 mailing list
> Freetel-codec2@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>
------------------------------------------------------------------------------
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://p.sf.net/sfu/appdyn_d2d_feb
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
