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Support codec G726 for Airoha

George Yang requested to merge genexis-iowrt/asterisk-chan-voicemngr:dev-gyang into devel

asterisk-chan-voicemngr uses old G726-32 RTP playload type '2' which is different from the type '80' used by Airoha DSP.

RFC3551 has re-defined RTP payload type of G726-32 to "dynamic", and payload type '2' as "reserved".

  1. Refactory the codec related functions as table-driven.

  2. Retrieve the RTP payload type from Airoha endpoint (provided by libvoice-airoha) via ubus call endpt codecs (attribute "rtp_payload").

    Received RTP payload type is applied, otherwise old one.

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