Ethereal-dev: Re: [Ethereal-dev] G.729

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From: Alejandro Vaquero <alejandrovaquero@xxxxxxxxx>
Date: Tue, 24 May 2005 07:04:20 -0600


Rami AlHasan wrote:

Thanks, do you have any links on how to convert the RTP g.729 into the format that the decoder expects? I would highly appreciate your help.
I don't know the link. But basically you take each bit of the payload, and convert to a 16-bit word, that is the input of the decoder. It worked fine for me.

And I would be grateful if you can give the mail address of the ITU
Don't know. Never tried to contact them.

Regards,
Rami
-----Original Message-----
From: ethereal-dev-bounces@xxxxxxxxxxxx [mailto:ethereal-dev-bounces@xxxxxxxxxxxx] On Behalf Of Alejandro Vaquero
Sent: Sunday, May 22, 2005 11:25 PM
To: Ethereal development
Subject: Re: [Ethereal-dev] G.729

If you are trying to use the G729 payload from an RTP to feed the decoder that will not work. The decoder is expecting a bit stream, each bit encoded as a 16-bit word: 0x0071=zero-bit and 0x0081=one-bit

PS: this looks like a question for the ITU mailing list :-)

Regards
Alejandro

Rami AlHasan wrote:

I wonder if any have any idea about the ITU G.729 sample implementation sample code. when we use their decoder application, then generated PCM 16-bit file is almost the same size as the input bitstream g.729 file, and we know that this is a compressed format, is there a problem, or those samples are assuming something special?

Please help, Thanks Rami


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