[Linphone-developers] RE: Linphone-developers Digest, Vol 38, Issue 8

[Grover Vishal-E50370]

Thanks a lot for this tip. But using two different instances of the GSM
handle does  not fix the issue. 

Any other ideas?? 
 

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Today's Topics:

   1. Issue with snd card writes (Grover Vishal-E50370)
   2. Re: Issue with snd card writes (Kosta Welke)


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Message: 1
Date: Wed, 12 Apr 2006 18:05:22 -0400
From: "Grover Vishal-E50370" <address@hidden>
Subject: [Linphone-developers] Issue with snd card writes
To: <address@hidden>
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        <address@hidden>
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Hi,
I am integrating my own RTP/SIP engine(not linphone's RTP stack) with
only the codec libraries from mediastreamer and the snd card interface.

I am experiencing problems with snd card write. Here is what happens..

Take GSM codec for example
During read, I read 160*2 bytes from the snd card, convert it into 33
bytes of GSM data and send it. I can hear audio on the other party's
side as well, when I place the phone call.

During write, I get 33 bytes of GSM data which is decoded to 160*2 raw
sound data, but I am not hear any audio. 

I keep hearing hissing sounds, which seem to flucturate depending on the
audio. So it does seem it is getting audio, but  why does it not write
it correctly is still a mystery..

Any ideas or help is appreciated.


Thanks,
Vishal




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Message: 2
Date: Thu, 13 Apr 2006 17:38:35 +0200
From: Kosta Welke <address@hidden>
Subject: Re: [Linphone-developers] Issue with snd card writes
To: Grover Vishal-E50370 <address@hidden>
Cc: address@hidden
Message-ID: <address@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Grover Vishal-E50370 wrote:
> I keep hearing hissing sounds, which seem to flucturate depending on 
> the audio. So it does seem it is getting audio, but  why does it not 
> write it correctly is still a mystery..

This may have nothing to do with your problem, but do you use two
instances of the GSM codec, one for en- and one for de-coding? Using
just one will result in weird behavior.

Kosta




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