Decoding RTP packets G.729

Question

I have a byte array with RTP packets in it.

I am not using a SIP client, I just have the array.

Is there an option to decode the packets in g.729 and then record the voice and save it into a WAV file?

score 0 · Accepted Answer · answered Sep 11 '12 at 06:50

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You can find some help here:

http://www.koders.com/csharp/fid5FF057FB1D01EBB06AE9B0DFF096CA01A572D167.aspx

answered Sep 11 '12 at 06:50

ragklaat

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Where can i find the dll for this code? I have a error that says that it cant find the g729 dll.. – Ofek Agmon Sep 23 '12 at 07:35

score 0 · Answer 2 · answered Sep 11 '12 at 06:51

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you need a g.729 decoder for decoding the payload from the rtp packets. as far as i know audacity is capable of doing this job. extract the raw data from the rtp stream with wireshark and then decode the audio data ... this should work.

answered Sep 11 '12 at 06:51

user1661910

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Thnaks, But the thing is I need to do it Programmatically (in C#).. Any Suggestions? – Ofek Agmon Sep 12 '12 at 10:48

score 0 · Answer 3 · answered Jan 09 '13 at 15:28

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Write rtp byte array to a raw file. Then you can convert that file to mp3 by using ffmpeg.exe with g729 decode command.

ffmpeg.exe -f alaw -ar 8000  -i " + rawFile + ".raw " + rawFile + ".mp3

Above is the command to convert to mp3.

All the best.

answered Jan 09 '13 at 15:28

Mask

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Decoding RTP packets G.729

3 Answers3