[Linphone-developers] Oss driver support

[safiudeen]

Hi,

Everyone say linphone works fine with oss sound driver but it does'nt 
work simply.
I am testing linphone with mips(DB1100 bord running emb linux-2.4.20).

I am using linphone between DB1100 board  and a  x86 PC ( running on 
redhat 9 with alsa sound driver)


I can here the audio in put of  PC at DB1100 ( it is very clear and no 
echo or delay),but I could not here the audio input of DB  at PC .

To solve this problem,I checked the osscard.c, "oss_card_can_read" 
function was always returning  FALSE that's why  application never go to 
read the input.

I have other the similar setup a labtop (running Redhat 9 with oss sound 
driver- via82xx) and a Desktop PC (running on RedHat 9 with alsa sound 
driver).Here also labtob site resul is same as the DB1100 board.

I modyfied that function so that it  returns TRUE for what ever 
condtions in this function.Then I was able to recive some noice.After I 
modyfied msossread.c (r-gran= 160 * 2; in "ms_oss_read_start") according 
to mailing list suggesstion, I was able recive audio from DB1100 with 
much echo,delay and noice.

 I realised the probles is trigering the sound card. Now I changed  
"oss_card_can_read" function backed to it is original code, and add a 
dummy read in "oss_open" in osscard.c, after all initiation, it read 
zero bytes from the card. It triger the sound card ,now the  
ss_card_can_read  function look like works.

It reduced condiderable noce and delay, but still the echo is there  
audio is not much clear.

1) Is it ok to use read function to triger, are there any other way to 
do this ?

2) What is the  impact on changing  r->gran=(512*r->freq)/8000 ; to 
r->gran= 160 * 2; ?
    are there any other value  for  "r->gran=" that can be better ?

If anyone made the linphone works with oss sound driver via82xx, please 
help me in this reagrds.

Regards
Safi