How to use MS GSM support in JMF?

Hello,
Anyone has idea how to use the MS GSM encoding and decoding support in JMF.
As Microsoft GSM is different from the standard GSM 6.10, however, JMF can both read and write MS-GSM coded file (in .wav wrapper). Here I would like to know whether it is possible to have real-time encoding and decoding in MS GSM format?
This is very important for me as I need to use PocketPC for live audio streaming and it only support microsoft GSM coding.
Thanks in advance
/h.b.

Hello,
Did you (hotbee) eventually solved your problem ?
I'm writing an application which listens to a GSM 06.10 audio stream from a multicast socket.
The application that sends the audio is written in C++ and I don't manage to find the correct parameters for JMF to be able to decode it...
Here is the C++ code that encodes the audio :
m_WaveFormatEx.wfx.wFormatTag = WAVE_FORMAT_GSM610;
m_WaveFormatEx.wfx.nChannels = 1;
m_WaveFormatEx.wfx.nSamplesPerSec = 9920;
m_WaveFormatEx.wfx.nBlockAlign = 65;
m_WaveFormatEx.wfx.wBitsPerSample = 0;
m_WaveFormatEx.wfx.cbSize = 2;
m_WaveFormatEx.wSamplesPerBlock = 320;
m_WaveFormatEx.wfx.nAvgBytesPerSec = (m_WaveFormatEx.wfx.nSamplesPerSec / 320) * 65; Is JMF (Windows performance pack) able to decode this ?
If so, what is the AudioFormat I should return from my custom SourceStream ?
I tried quite a lot of parameters (GSM, GSM_MS with various combination of parameters), but couldn't get an audible sound... :(
Thanks for any help !
Julien

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Attachments:
GSM error.JPG ‏34 KB
manual.JPG ‏91 KB

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