Payload type of wav files encoded with gms codec

Hello everybody,
I have an application which receives and plays alaw formated wav files using JMF(with the help of some additional libraries) . I want to use lower bandwidth for my application. A quick google search indicated that i can do this by using gsm format.
I have 2 questions:
1-) what are the differences between .gsm files and .wav files which are encoded with gsm codecs? Which one's quality is better? which one's compression ratio is better?
2-) which payload type should i use for wav files which are encoded with gsm codecs?
In [Rtp Payload list|http://www.iana.org/assignments/rtp-parameters] page, there is a gsm entry whose payload is 3. I suppose that is for files with gsm extension. I tried it but it didn't work with my wav sample (as u can guess it was encoded with gsm 6.10 codec)
Any suggestion is appreciated. If you have a comment about the main problem (which is using lower bandwidth for sending audio data) i would also like to hear it
Thanks in advance
btw i also tried this [gsm sample|http://www.nch.com.au/acm/sample.gsm] with payload 3.At first it worked but then strangely it played just static. In Sun's page it says gsm format is supported. I played both ulaw and alaw succesfully so i wonder what i am doing wrong. Do we need to tell the player that it is going to receive data in gsm format? I didnt do such a thing for u-law and a-law formats...
Edited by: Bugra.Hasbek on Nov 10, 2008 1:18 AM

Bugra.Hasbek wrote:
Hello everybody,
I have an application which receives and plays alaw formated wav files using JMF(with the help of some additional libraries) . I want to use lower bandwidth for my application. A quick google search indicated that i can do this by using gsm format.
I have 2 questions:
1-) what are the differences between .gsm files and .wav files which are encoded with gsm codecs? Which one's quality is better? which one's compression ratio is better?I would imagine they are the same...
2-) which payload type should i use for wav files which are encoded with gsm codecs?I would imagine 3...
In [Rtp Payload list|http://www.iana.org/assignments/rtp-parameters] page, there is a gsm entry whose payload is 3. I suppose that is for files with gsm extension. I tried it but it didn't work with my wav sample (as u can guess it was encoded with gsm 6.10 codec)
Any suggestion is appreciated. If you have a comment about the main problem (which is using lower bandwidth for sending audio data) i would also like to hear itMy suggestion would be not to worry about so much stuff. JMF does all of this for you automaticlly.
On the sender side, make your processor take in whatever kind of supported file you want. Set the processor to output your GSM mono, and then you can just use a Player to play it on the other side. It's really not very different than the examples...
[http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/AVTransmit.html]
When you're programming the tracks, and you're calling "setFormat" on them, just set their format to be gsm.
[http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/AVReceive.html] should be able to play this out of the box...

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