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/*
* (C) 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
* All rights reserved.
*
* Author: Pau Espin Pedrol <pespin@sysmocom.de>
*
* Released under the terms of GNU General Public License, Version 2 or
* (at your option) any later version.
*/
module OSMUX_Types {
import from General_Types all;
import from Misc_Helpers all;
import from AMR_Types all;
external function enc_OSMUX_PDU ( in OSMUX_PDU msg ) return octetstring
with { extension "prototype(convert) encode(RAW)" };
external function dec_OSMUX_PDU ( in octetstring msg ) return OSMUX_PDU
with { extension "prototype(convert) decode(RAW)" };
type INT1 OsmuxCID (0 .. 255);
type enumerated OsmuxFT {
OSMUX_FT_LAPD,
OSMUX_FT_AMR,
OSMUX_FT_DUMMY
};
type record Osmux_AMR_header {
BIT1 marker,
INT2b ft,
INT3b ctr,
BIT1 amr_f,
BIT1 amr_q,
INT1 seq,
OsmuxCID cid,
INT4b amr_ft,
INT4b amr_cmr
} with {
variant "FIELDORDER(msb)"
}
type record PDU_Osmux_AMR {
Osmux_AMR_header header,
octetstring data
} with {
variant "FIELDORDER(msb)"
};
type record PDU_Osmux_DUMMY {
Osmux_AMR_header header,
octetstring data
} with {
variant "FIELDORDER(msb)"
};
type record Osmux_session_par {
integer id optional,
charstring local_address optional,
integer local_port optional,
charstring dest_address optional,
integer dest_port optional
}
type record ASP_Osmux_Open_session {
Osmux_session_par session_id
}
type record ASP_Osmux_Open_session_result {
Osmux_session_par session_id
}
type record ASP_Osmux_Close_session {
Osmux_session_par session_id
}
type union OSMUX_PDU {
PDU_Osmux_AMR osmux_amr,
PDU_Osmux_DUMMY osmux_dummy
} with {
variant "TAG (
osmux_amr, header.ft = 1;
osmux_dummy, header.ft = 2;
)"
};
template (present) OSMUX_PDU tr_PDU_Osmux_AMR(template (present) BIT1 marker := ?,
template (present) INT3b ctr := ?,
template (present) BIT1 amr_f := ?,
template (present) BIT1 amr_q := ?,
template (present) INT1 seq := ?,
template (present) OsmuxCID cid := ?,
template (present) INT4b amr_ft := ?,
template (present) INT4b amr_cmr := ?,
template (present) octetstring payload := ?) := {
osmux_amr := {
header := {
marker := marker,
ft := 1,
ctr := ctr,
amr_f := amr_f,
amr_q := amr_q,
seq := seq,
cid := cid,
amr_ft := amr_ft,
amr_cmr := amr_cmr
},
data := payload
}
}
/* Get Nth AMR payload of osmux AMR frame (starting from 0) */
function f_osmux_amr_get_nth_amr_payload(PDU_Osmux_AMR osmux_amr, integer nth) return octetstring
{
var integer amr_pl_len := f_amrft_payload_len(osmux_amr.header.amr_ft);
if (nth > osmux_amr.header.ctr) {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "nth > ctr");
return ''O;
}
if (amr_pl_len * (nth+1) > lengthof(osmux_amr.data)) {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "osmux payload too short");
}
var octetstring pl := substr(osmux_amr.data, amr_pl_len * nth, amr_pl_len);
return pl;
}
} with { encode "RAW"}
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