[Asterisk-Users] iLBC/PCM16 Huge Cost

[Benjamin on Asterisk Mailing Lists]

On Sat, 23 Oct 2004 02:16:44 -0700, Trevor Peirce <tpeirce at digitalcon.ca> wrote:
>         G723   GSM  ULAW  ALAW  G726 ADPCM SLINR LPC10 G729A SPEEX  ILBC
>   G723     -     -     -     -     -     -     -     -     -     -     -
>    GSM     -     -     2     2     4     2     1  1238     -     - 529695
>   ULAW     -     5     -     1     4     2     1  1238     -     - 529695
>   ALAW     -     5     1     -     4     2     1  1238     -     - 529695
>   G726     -     7     4     4     -     4     3  1240     -     - 529697
>  ADPCM     -     5     2     2     4     -     1  1238     -     - 529695
>  SLINR     -     4     1     1     3     1     -  1237     -     - 529694
>  LPC10     -   196   193   193   195   193   192     -     -     - 529886
>  G729A     -     -     -     -     -     -     -     -     -     -     -
>  SPEEX     -     -     -     -     -     -     -     -     -     -     -
>   ILBC     -   219   216   216   218   216   215  1452     -     -     -
> 

Whoa. There must be something very wrong with your codec translation.
I am getting the following on a PIII 533MHz IBM with Intel mobo, two
Zaptel cards, no shared interrupts ...

tyo-switch*CLI> show translation
         Translation times between formats (in milliseconds)
          Source Format (Rows) Destination Format(Columns)

         G723   GSM  ULAW  ALAW  G726 ADPCM SLINR LPC10 G729A SPEEX  ILBC
   G723     -     -     -     -     -     -     -     -     -     -     -
    GSM     -     -     4     4    10     4     3     -     -     -    66
   ULAW     -     9     -     1     8     2     1     -     -     -    64
   ALAW     -     9     1     -     8     2     1     -     -     -    64
   G726     -    15     8     8     -     8     7     -     -     -    70
  ADPCM     -     9     2     2     8     -     1     -     -     -    64
  SLINR     -     8     1     1     7     1     -     -     -     -    63
  LPC10     -     -     -     -     -     -     -     -     -     -     -
  G729A     -     -     -     -     -     -     -     -     -     -     -
  SPEEX     -     -     -     -     -     -     -     -     -     -     -
   ILBC     -    18    11    11    17    11    10     -     -     -     -

Can you set up a test call where Asterisk will transcode from ulaw to
ILBC and see what it does to your CPU load?

rgds
benjk

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