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Old 07-09-2004, 06:59 AM   #1
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Registered: Jul 2004
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audio problem in mic echo

i am working in Linux 9, and write a voip application

soundcard chip: C-Media CMI8738

my problem is

when i recording voice from mic, the signal will be hear from my earphone.

but i do not want hear the echo from the earphone, because my earphone

need to play the RTP packet data.

in C-Media CMI8738 device driver the mixer seem only support


what i need to do from the "ioctl" function(i need to write the problem,and

can not use the toolkit to change the mixer setting), that i will not hear the

echo vocie from my mic. Likely in WinXP turn the mic to mute.

thank for your help.


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