add codec_sdp_cc_t9n.h,c

Related: SYS#5066
Change-Id: Iaa307be6a8487aa8d4ba7cd59d5c5ef04818a744
Neels Hofmeyr 11 months ago
parent 992da84cec
commit ede1cad106
  1. 1
      include/osmocom/msc/Makefile.am
  2. 68
      include/osmocom/msc/codec_sdp_cc_t9n.h
  3. 1
      src/libmsc/Makefile.am
  4. 446
      src/libmsc/codec_sdp_cc_t9n.c

@ -1,6 +1,7 @@
noinst_HEADERS = \
call_leg.h \
cell_id_list.h \
codec_sdp_cc_t9n.h \
db.h \
debug.h \
e_link.h \

@ -0,0 +1,68 @@
/* Routines for translation ("t9n") between SDP codec names and CC/BSSMAP codec constants */
#pragma once
#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <osmocom/gsm/protocol/gsm_08_08.h>
#include <osmocom/mgcp_client/mgcp_client.h>
#include <osmocom/msc/sdp_msg.h>
#include <osmocom/gsm/mncc.h>
#define NO_MGCP_CODEC 0xffffffff
extern const struct gsm_mncc_bearer_cap bearer_cap_empty;
enum codec_frhr {
CODEC_FRHR_NONE = 0,
CODEC_FRHR_FR,
CODEC_FRHR_HR,
};
struct codec_mapping {
/* The sdp.payload_type number in a mapping is not necessarily imperative, but may just reflect the usual
* payload type number for a given codec. */
struct sdp_audio_codec sdp;
/* The id that mgcp_client.h uses for this codec. Must be set in each mapping, because 0 means PCMU. */
enum mgcp_codecs mgcp;
/* Nr of used entries in speech_ver[] below. */
unsigned int speech_ver_count;
/* Entries to add to Speech Version lists when this codec is present, if any. */
enum gsm48_bcap_speech_ver speech_ver[8];
/* If applicable, one of GSM_TCHF_FRAME, GSM_TCHF_FRAME_EFR, GSM_TCHH_FRAME, GSM_TCH_FRAME_AMR; or zero. */
uint32_t mncc_payload_msg_type;
/* Set to true if gsm0808_speech_codec_type below reflects a meaningful value. */
bool has_gsm0808_speech_codec_type;
/* gsm0808_speech_codec_type corresponds to gsm0808_speech_codec[_list]->type */
enum gsm0808_speech_codec_type gsm0808_speech_codec_type;
/* If applicable, entries to add to Permitted Speech lists when this codec is present; or zero. */
enum gsm0808_permitted_speech perm_speech;
/* If applicable, indicator whether this codec can work on a GERAN half-rate lchan, or whether full-rate is
* required. Leave zero when this codec does not apply to GERAN. */
enum codec_frhr frhr;
};
extern const struct codec_mapping codec_map[];
#define foreach_codec_mapping(CODEC_MAPPING) \
for ((CODEC_MAPPING) = codec_map; (CODEC_MAPPING) < codec_map + ARRAY_SIZE(codec_map); (CODEC_MAPPING)++)
const struct codec_mapping *codec_mapping_by_speech_ver(enum gsm48_bcap_speech_ver speech_ver);
const struct codec_mapping *codec_mapping_by_gsm0808_speech_codec_type(enum gsm0808_speech_codec_type sct,
uint16_t cfg);
const struct codec_mapping *codec_mapping_by_perm_speech(enum gsm0808_permitted_speech perm_speech);
const struct codec_mapping *codec_mapping_by_subtype_name(const char *subtype_name);
const struct codec_mapping *codec_mapping_by_mgcp_codec(enum mgcp_codecs mgcp);
int bearer_cap_add_speech_ver(struct gsm_mncc_bearer_cap *bearer_cap, enum gsm48_bcap_speech_ver speech_ver);
int sdp_audio_codec_add_to_bearer_cap(struct gsm_mncc_bearer_cap *bearer_cap, const struct sdp_audio_codec *codec);
int sdp_audio_codecs_to_bearer_cap(struct gsm_mncc_bearer_cap *bearer_cap, const struct sdp_audio_codecs *ac);
int bearer_cap_set_radio(struct gsm_mncc_bearer_cap *bearer_cap);
struct sdp_audio_codec *sdp_audio_codecs_add_speech_ver(struct sdp_audio_codecs *ac,
enum gsm48_bcap_speech_ver speech_ver);
struct sdp_audio_codec *sdp_audio_codecs_add_mgcp_codec(struct sdp_audio_codecs *ac, enum mgcp_codecs mgcp_codec);
void sdp_audio_codecs_from_bearer_cap(struct sdp_audio_codecs *ac, const struct gsm_mncc_bearer_cap *bc);
void sdp_audio_codecs_from_speech_codec_list(struct sdp_audio_codecs *ac, const struct gsm0808_speech_codec_list *cl);
int sdp_audio_codecs_to_gsm0808_channel_type(struct gsm0808_channel_type *ct, const struct sdp_audio_codecs *ac);
enum mgcp_codecs sdp_audio_codec_to_mgcp_codec(const struct sdp_audio_codec *codec);

@ -27,6 +27,7 @@ noinst_LIBRARIES = \
libmsc_a_SOURCES = \
call_leg.c \
cell_id_list.c \
codec_sdp_cc_t9n.c \
sccp_ran.c \
msc_vty.c \
db.c \

@ -0,0 +1,446 @@
/* Translate codec discriminators between SDP and various GSM representations */
/*
* (C) 2019-2022 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* Author: Neels Hofmeyr
*
* SPDX-License-Identifier: GPL-2.0+
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <string.h>
#include <osmocom/gsm/mncc.h>
#include <osmocom/msc/sdp_msg.h>
#include <osmocom/msc/codec_sdp_cc_t9n.h>
#include <osmocom/msc/mncc.h>
const struct codec_mapping codec_map[] = {
/* FIXME: I'm not sure about OFR, OHR -- O means octet-aligned?? */
/* FIXME: sdp.fmtp handling is not done properly. I am not sure whether we should completely remove fmtp from
* this mapping, or more intelligently map actual fmtp contents (instead of strcmp). I hope that we will reach
* some clarity on this subject in the future. */
{
.sdp = {
.payload_type = 0,
.subtype_name = "PCMU",
.rate = 8000,
},
.mgcp = CODEC_PCMU_8000_1,
},
{
.sdp = {
.payload_type = 3,
.subtype_name = "GSM",
.rate = 8000,
},
.mgcp = CODEC_GSM_8000_1,
.speech_ver_count = 1,
.speech_ver = { GSM48_BCAP_SV_FR },
.mncc_payload_msg_type = GSM_TCHF_FRAME,
.has_gsm0808_speech_codec_type = true,
.gsm0808_speech_codec_type = GSM0808_SCT_FR1,
.perm_speech = GSM0808_PERM_FR1,
.frhr = CODEC_FRHR_FR,
},
{
.sdp = {
.payload_type = 8,
.subtype_name = "PCMA",
.rate = 8000,
},
.mgcp = CODEC_PCMA_8000_1,
},
{
.sdp = {
.payload_type = 18,
.subtype_name = "G729",
.rate = 8000,
},
.mgcp = CODEC_G729_8000_1,
},
{
.sdp = {
.payload_type = 110,
.subtype_name = "GSM-EFR",
.rate = 8000,
},
.mgcp = CODEC_GSMEFR_8000_1,
.speech_ver_count = 1,
.speech_ver = { GSM48_BCAP_SV_EFR },
.mncc_payload_msg_type = GSM_TCHF_FRAME_EFR,
.has_gsm0808_speech_codec_type = true,
.gsm0808_speech_codec_type = GSM0808_SCT_FR2,
.perm_speech = GSM0808_PERM_FR2,
.frhr = CODEC_FRHR_FR,
},
{
.sdp = {
.payload_type = 111,
.subtype_name = "GSM-HR-08",
.rate = 8000,
},
.mgcp = CODEC_GSMHR_8000_1,
.speech_ver_count = 1,
.speech_ver = { GSM48_BCAP_SV_HR },
.mncc_payload_msg_type = GSM_TCHH_FRAME,
.has_gsm0808_speech_codec_type = true,
.gsm0808_speech_codec_type = GSM0808_SCT_HR1,
.perm_speech = GSM0808_PERM_HR1,
.frhr = CODEC_FRHR_HR,
},
{
.sdp = {
.payload_type = 112,
.subtype_name = "AMR",
.rate = 8000,
/* It is empirically shown to be important to send this fmtp parameter to a SIP peer in SDP,
* otherwise the voice audio is broken noise.
* However, a SIP peer may offer AMR without this parameter set in its SDP, so fmtp must be
* ignored during codec matching: otherwise an incoming AMR codec without this parameter fails
* to match this entry, and it ends in an aborted call due to no codec match.
* If the peer offers plain "AMR/8000" and we reply with "AMR/8000 fmtp:octet-align=1",
* then everything works out happily, */
.fmtp = "octet-align=1",
},
.mgcp = CODEC_AMR_8000_1,
.speech_ver_count = 1,
.speech_ver = { GSM48_BCAP_SV_AMR_F },
.mncc_payload_msg_type = GSM_TCH_FRAME_AMR,
.has_gsm0808_speech_codec_type = true,
.gsm0808_speech_codec_type = GSM0808_SCT_FR3,
.perm_speech = GSM0808_PERM_FR3,
.frhr = CODEC_FRHR_FR,
},
{
.sdp = {
.payload_type = 112,
.subtype_name = "AMR",
.rate = 8000,
.fmtp = "octet-align=1;mode-set=0,1,2,3",
},
.mgcp = CODEC_AMR_8000_1,
.speech_ver_count = 2,
.speech_ver = { GSM48_BCAP_SV_AMR_H, GSM48_BCAP_SV_AMR_OH },
.mncc_payload_msg_type = GSM_TCH_FRAME_AMR,
.has_gsm0808_speech_codec_type = true,
.gsm0808_speech_codec_type = GSM0808_SCT_HR3,
.perm_speech = GSM0808_PERM_HR3,
.frhr = CODEC_FRHR_HR,
},
{
.sdp = {
.payload_type = 113,
.subtype_name = "AMR-WB",
.rate = 16000,
.fmtp = "octet-align=1",
},
.mgcp = CODEC_AMRWB_16000_1,
.speech_ver_count = 2,
.speech_ver = { GSM48_BCAP_SV_AMR_OFW, GSM48_BCAP_SV_AMR_FW },
.mncc_payload_msg_type = GSM_TCH_FRAME_AMR,
.has_gsm0808_speech_codec_type = true,
.gsm0808_speech_codec_type = GSM0808_SCT_FR5,
.perm_speech = GSM0808_PERM_FR5,
.frhr = CODEC_FRHR_FR,
},
{
.sdp = {
.payload_type = 113,
.subtype_name = "AMR-WB",
.rate = 16000,
.fmtp = "octet-align=1;mode-set=0,1,2,3", /* TODO: does this make sense?? */
},
.mgcp = CODEC_AMRWB_16000_1,
.speech_ver_count = 1,
.speech_ver = { GSM48_BCAP_SV_AMR_OHW },
.mncc_payload_msg_type = GSM_TCH_FRAME_AMR,
.has_gsm0808_speech_codec_type = true,
.gsm0808_speech_codec_type = GSM0808_SCT_HR4,
.perm_speech = GSM0808_PERM_HR4,
.frhr = CODEC_FRHR_HR,
},
};
const struct gsm_mncc_bearer_cap bearer_cap_empty = {
.speech_ver = { -1 },
};
const struct codec_mapping *codec_mapping_by_speech_ver(enum gsm48_bcap_speech_ver speech_ver)
{
const struct codec_mapping *m;
foreach_codec_mapping(m) {
int i;
for (i = 0; i < m->speech_ver_count; i++)
if (m->speech_ver[i] == speech_ver)
return m;
}
return NULL;
}
const struct codec_mapping *codec_mapping_by_gsm0808_speech_codec_type(enum gsm0808_speech_codec_type sct, uint16_t cfg)
{
const struct codec_mapping *m;
foreach_codec_mapping(m) {
if (!m->has_gsm0808_speech_codec_type)
continue;
if (m->gsm0808_speech_codec_type == sct)
return m;
/* TODO: evaluate cfg bits? */
}
return NULL;
}
const struct codec_mapping *codec_mapping_by_perm_speech(enum gsm0808_permitted_speech perm_speech)
{
const struct codec_mapping *m;
foreach_codec_mapping(m) {
if (m->perm_speech == perm_speech)
return m;
}
return NULL;
}
const struct codec_mapping *codec_mapping_by_subtype_name(const char *subtype_name)
{
const struct codec_mapping *m;
foreach_codec_mapping(m) {
if (!strcmp(m->sdp.subtype_name, subtype_name))
return m;
}
return NULL;
}
const struct codec_mapping *codec_mapping_by_mgcp_codec(enum mgcp_codecs mgcp)
{
const struct codec_mapping *m;
foreach_codec_mapping(m) {
if (m->mgcp == mgcp)
return m;
}
return NULL;
}
/* Append given Speech Version to the end of the Bearer Capabilities Speech Version array. Return 1 if added, zero
* otherwise (as in, return the number of items added). */
int bearer_cap_add_speech_ver(struct gsm_mncc_bearer_cap *bearer_cap, enum gsm48_bcap_speech_ver speech_ver)
{
int i;
for (i = 0; i < ARRAY_SIZE(bearer_cap->speech_ver) - 1; i++) {
if (bearer_cap->speech_ver[i] == speech_ver)
return 0;
if (bearer_cap->speech_ver[i] == -1) {
bearer_cap->speech_ver[i] = speech_ver;
bearer_cap->speech_ver[i+1] = -1;
return 1;
}
}
return 0;
}
/* From the current speech_ver list present in the bearer_cap, set the bearer_cap.radio.
* If a HR speech_ver is present, set to GSM48_BCAP_RRQ_DUAL_FR, otherwise set to GSM48_BCAP_RRQ_FR_ONLY. */
int bearer_cap_set_radio(struct gsm_mncc_bearer_cap *bearer_cap)
{
bool hr_present;
int i;
for (i = 0; i < ARRAY_SIZE(bearer_cap->speech_ver) - 1; i++) {
const struct codec_mapping *m = codec_mapping_by_speech_ver(bearer_cap->speech_ver[i]);
if (!m)
continue;
if (m->frhr == CODEC_FRHR_HR)
hr_present = true;
}
if (hr_present)
bearer_cap->radio = GSM48_BCAP_RRQ_DUAL_FR;
else
bearer_cap->radio = GSM48_BCAP_RRQ_FR_ONLY;
return 0;
}
/* Try to convert the SDP audio codec name to Speech Versions to append to Bearer Capabilities.
* Return the number of Speech Version entries added (some may add more than one, others may be unknown/unapplicable and
* return 0). */
int sdp_audio_codec_add_to_bearer_cap(struct gsm_mncc_bearer_cap *bearer_cap, const struct sdp_audio_codec *codec)
{
const struct codec_mapping *m;
int added = 0;
foreach_codec_mapping(m) {
int i;
if (strcmp(m->sdp.subtype_name, codec->subtype_name))
continue;
/* TODO also match rate and fmtp? */
for (i = 0; i < m->speech_ver_count; i++) {
added += bearer_cap_add_speech_ver(bearer_cap, m->speech_ver[i]);
}
}
return added;
}
/* Append all audio codecs found in given sdp_msg to Bearer Capability, by traversing all codec entries with
* sdp_audio_codec_add_to_bearer_cap(). Return the number of Speech Version entries added.
* Note that Speech Version entries are only appended, no previous entries are removed.
* Note that only the Speech Version entries are modified; to make a valid Bearer Capabiliy, at least bearer_cap->radio
* must also be set (before or after this function); see also bearer_cap_set_radio(). */
int sdp_audio_codecs_to_bearer_cap(struct gsm_mncc_bearer_cap *bearer_cap, const struct sdp_audio_codecs *ac)
{
const struct sdp_audio_codec *codec;
int added = 0;
foreach_sdp_audio_codec(codec, ac) {
added += sdp_audio_codec_add_to_bearer_cap(bearer_cap, codec);
}
return added;
}
/* Convert Speech Version to SDP audio codec and append to SDP message struct. */
struct sdp_audio_codec *sdp_audio_codecs_add_speech_ver(struct sdp_audio_codecs *ac,
enum gsm48_bcap_speech_ver speech_ver)
{
const struct codec_mapping *m;
struct sdp_audio_codec *ret = NULL;
foreach_codec_mapping(m) {
int i;
for (i = 0; i < m->speech_ver_count; i++) {
if (m->speech_ver[i] == speech_ver) {
ret = sdp_audio_codecs_add_copy(ac, &m->sdp);
break;
}
}
}
return ret;
}
struct sdp_audio_codec *sdp_audio_codecs_add_mgcp_codec(struct sdp_audio_codecs *ac, enum mgcp_codecs mgcp_codec)
{
const struct codec_mapping *m = codec_mapping_by_mgcp_codec(mgcp_codec);
if (!m)
return NULL;
return sdp_audio_codecs_add_copy(ac, &m->sdp);
}
void sdp_audio_codecs_from_bearer_cap(struct sdp_audio_codecs *ac, const struct gsm_mncc_bearer_cap *bc)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(bc->speech_ver); i++) {
if (bc->speech_ver[i] == -1)
break;
sdp_audio_codecs_add_speech_ver(ac, bc->speech_ver[i]);
}
}
void sdp_audio_codecs_from_speech_codec_list(struct sdp_audio_codecs *ac, const struct gsm0808_speech_codec_list *cl)
{
int i;
for (i = 0; i < cl->len; i++) {
const struct gsm0808_speech_codec *sc = &cl->codec[i];
const struct codec_mapping *m = codec_mapping_by_gsm0808_speech_codec_type(sc->type, sc->cfg);
if (!m)
continue;
sdp_audio_codecs_add_copy(ac, &m->sdp);
}
}
int sdp_audio_codecs_to_gsm0808_channel_type(struct gsm0808_channel_type *ct, const struct sdp_audio_codecs *ac)
{
const struct sdp_audio_codec *codec;
bool fr_present = false;
int first_fr_idx = -1;
bool hr_present = false;
int first_hr_idx = -1;
int idx = -1;
*ct = (struct gsm0808_channel_type){
.ch_indctr = GSM0808_CHAN_SPEECH,
};
foreach_sdp_audio_codec(codec, ac) {
const struct codec_mapping *m;
int i;
bool dup;
idx++;
foreach_codec_mapping(m) {
if (strcmp(m->sdp.subtype_name, codec->subtype_name))
continue;
switch (m->perm_speech) {
default:
continue;
case GSM0808_PERM_FR1:
case GSM0808_PERM_FR2:
case GSM0808_PERM_FR3:
case GSM0808_PERM_FR4:
case GSM0808_PERM_FR5:
fr_present = true;
if (first_fr_idx < 0)
first_fr_idx = idx;
break;
case GSM0808_PERM_HR1:
case GSM0808_PERM_HR2:
case GSM0808_PERM_HR3:
case GSM0808_PERM_HR4:
case GSM0808_PERM_HR6:
hr_present = true;
if (first_hr_idx < 0)
first_hr_idx = idx;
break;
}
/* Avoid duplicates */
dup = false;
for (i = 0; i < ct->perm_spch_len; i++) {
if (ct->perm_spch[i] == m->perm_speech) {
dup = true;
break;
}
}
if (dup)
continue;
ct->perm_spch[ct->perm_spch_len] = m->perm_speech;
ct->perm_spch_len++;
}
}
if (fr_present && hr_present) {
if (first_fr_idx <= first_hr_idx)
ct->ch_rate_type = GSM0808_SPEECH_FULL_PREF;
else
ct->ch_rate_type = GSM0808_SPEECH_HALF_PREF;
} else if (fr_present && !hr_present)
ct->ch_rate_type = GSM0808_SPEECH_FULL_BM;
else if (!fr_present && hr_present)
ct->ch_rate_type = GSM0808_SPEECH_HALF_LM;
else
return -EINVAL;
return 0;
}
enum mgcp_codecs sdp_audio_codec_to_mgcp_codec(const struct sdp_audio_codec *codec)
{
const struct codec_mapping *m;
foreach_codec_mapping(m) {
if (!sdp_audio_codec_cmp(&m->sdp, codec, false, false))
return m->mgcp;
}
return NO_MGCP_CODEC;
}
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