These changes will allow dynamically negotiating AMR rates between 2G
and 3G, and between full-rate and half-rate, spanning from 2G and 3G RAN
all the way across to SDP over MNCC / SIP and back.
To ran_msg_assignment, add a full codecs list (sdp_audio_codecs).
So far, there was only the gsm0808_channel_type with a list of
permitted-speech entries, which is not a complete representation.
This patch only adds the list, the two users of this are added in
separate patches:
[2/3] In ran_msg_a.c for 2G:
Before this, we pass a gsm0808_channel_type to ran_msg_assignment, and
from *that* we derive a gsm0808_speech_codec_list -- this loses the AMR
rate config bits. So far, we always transmitted the default cfg bits
defined in gsm0808_speech_codec_defaults, enabling all supported S0-S15
AMR rate combinations. Instead, we'll directly derive the available AMR
rates from the list of SDP codecs resulting from the codecs filter.
[3/3] In ran_msg_iu.c for 3G:
Before this, we compose a fixed set of RAB SDU subflows, i.e. for
exactly and only AMR 12k2. Now, we'll ask for RAB subflows corresponding
to the AMR codec's mode-set fmtp present in the codec list.
Change-Id: Ia9f4ad7f3646556aadc632bc5ffa477941626c5f
Neels Hofmeyr
03d015e786