RTP, AMR and ALSA playback support in Osmcoom gapk

Added by laforge 27 days ago

In the last few days, the Osmocom gapk (GSM Audio Pocket Knife) has been extended with the following feature set:
  • support of audio play-back via ALSA (standard Linux sound card drivers)
  • support for Adaptive Multi-Rate (AMR)
  • support for RTP payload formats for AMR, EFR HR-ETSI and HR-IETF

If all those new features are combined, you can use gapk as a RTP playback sink for any of the codecs used in (not only) Osmocom GSM networks. This is very useful for debugging, particularly if combined with a recent patch to OsmoBSC/OsmoNITB enabling the administrator to re-direct any BTS-originated RTP stream of an active call by issuing an IPA RSL MDCX command.


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