[Iaxclient-devel] IAX and ARM RISC

[S <s...@ka...>]

Hi Steve,

thanks for your last mail. Before I comment your last mail I like to 
explain what I try to do.

I like to write a IAX Telephone Client for the Zaurus PDA. The Zaurus 
PDA run's Linux and use a Srong ARM RISC 1110 CPU with about 137 BogoMips.
As basis for this project I use the iaxclient lib and parts of 
simpleclient. Also I use portaudio with some little changes for my Zaurus.

So back to your last mail:

You wrote :
 > If you're using portaudio, then audio.input should be pa_input, which 
 > is a simple function, which just looks to see if the RingBuffer has
 > data in it.  Unless something is causing things to run very slowly for
 > you, then it should only have data occasionally.

This sounds the Zaurus ARM CPU is to slow. For this reason I have to 
find out where the time goes in iaxclib.
My Phone client is still a simple program with out any GUI.
I suspect there is something wrong in the send_encoded_audio || 
input_postprocess chain, because I never get silent back (I tried it on 
my power full PC never silent).
If you have some other idea where the problem is let me know.

So here is my IAX observation :

One of the main problem porting the IAX lib to the ARM CPU is, the IAX 
protocol is not word align.
Word align mean every integer, short or pointer need to be on a address 
which is divisible thru 4 (4*8bit = 32bit, and ARM CPU is a 32bit CPU).
For this reason I have made some changes in the libiax2 part.
I will send you the changes later because I like to get the phone client 
  running first.
In different mail I have seen notice from people who write they run 
iaxclib and asterisk on RISC machines without problems. I can't believe 
this. This code will crash an any RISC machine sone.

For more details I will send you the libiax2 changes later.

Regards

   Stephan