[asterisk-embedded] Realistic transcoding expectations on Blackfin platform

[Noël Bouchard]

Hello Stephen

You can have a good idea with the asterisk command :
show translation

Please post  the output of  it ..

Here is the output for a WRTSL54GS router with Broadcom CPU @ 266

 Translation times between formats (in milliseconds) for one second of data
          Source Format (Rows) Destination Format (Columns)

          g723 gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc g726 g722
     g723    -   -    -    -        -     -    -     -    -     -    -    -    -
      gsm    -   -   18   19        -     -   17     -    -     -    -    -    -
     ulaw    - 123    -    1        -     -    1     -    -     -    -    -    -
     alaw    - 124    1    -        -     -    2     -    -     -    -    -    -
 g726aal2    -   -    -    -        -     -    -     -    -     -    -    -    -
    adpcm    -   -    -    -        -     -    -     -    -     -    -    -    -
     slin    - 122    1    2        -     -    -     -    -     -    -    -    -

Here: Ulaw to GSM takes 123 msec to translate 1 sec of  audio (so a max 
of maybe 8 streams
and probably less to alloe for other CPU tasks)

and GSM to ulaw takes  18 msecs for 1 second.

+----------+

Isn't i possible to avoid translation ? If your FXO can be set to ude 
this codec
no translation  would be needed ... (?)

Noel

Stephen Davies wrote:

> Hi,
>
> What's a reasonable expectation on how many concurrent calls I can 
> expect a Blackfin appliance (eg AA50, Xorcom etc) to handle when 
> transcoding alaw/ulaw to and from GSM.
>
> I'm out of steam at about 5 or 6 calls and that's a bit disappointing 
> for me.
>
> Calls are coming in on FXO port and going out of IAX using GSM.
>
> Regards,
> Steve
>
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