Generate ima adpcm wav and gsm wav files

[Felipe Ferreira]

It's possible with gstreamer make Wave IMA ADPCM and Wave GSM files?

With Sox (a gpl tool) i can convert files to wav adpcm or wav gsm with:
sox input.wav -t wav -e ima-adpcm output.wav
sox input.wav -t wav -e gsm-full-rate output.wav

I need generate this files with gstreamer, but the wavenc plugin has sync
caps audio/x-raw and x-alaw only. adpcmenc has src caps audio/x-adpcm and
gsmenc has caps audio/x-gsm

Thanks =)
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