add sdp_msg API: SDP parsing/composition

Rationale: in order to add full SDP to the MNCC protocol (upcoming patch
I8c3b2de53ffae4ec3a66b9dabf308c290a2c999f), we need to parse and compose SDP
messages. Obviously, libosmo-mgcp-client already contains similar code, but
that is unfortunately heavily glued to the actual MGCP implementation. The
simplest solution is to create this separate implementation, copy-pasting from
the existing libosmo-mgcp-client code as is convenient.

This API is added here to probe whether it works well. When it does, the
intention is to "move it up" to osmo-mgw and overhaul the SDP parsing in our
MGCP client and MGCP server APIs using this same API.

Change-Id: If3ce23cd5bab15e2ab4c52ef3e4c75979dffe931
changes/47/15947/4
Neels Hofmeyr 3 years ago
parent bde605dfc5
commit eef4578102
  1. 1
      configure.ac
  2. 1
      include/osmocom/msc/Makefile.am
  3. 68
      include/osmocom/msc/sdp_msg.h
  4. 1
      src/libmsc/Makefile.am
  5. 576
      src/libmsc/sdp_msg.c
  6. 1
      tests/Makefile.am
  7. 32
      tests/sdp_msg/Makefile.am
  8. 569
      tests/sdp_msg/sdp_msg_test.c
  9. 0
      tests/sdp_msg/sdp_msg_test.err
  10. 590
      tests/sdp_msg/sdp_msg_test.ok
  11. 7
      tests/testsuite.at

@ -254,6 +254,7 @@ AC_OUTPUT(
tests/db_sms/Makefile
tests/sms_queue/Makefile
tests/msc_vlr/Makefile
tests/sdp_msg/Makefile
doc/Makefile
doc/examples/Makefile
doc/manuals/Makefile

@ -39,6 +39,7 @@ noinst_HEADERS = \
rrlp.h \
rtp_stream.h \
sccp_ran.h \
sdp_msg.h \
sgs_iface.h \
sgs_server.h \
sgs_vty.h \

@ -0,0 +1,68 @@
/* Minimalistic SDP parse/compose API, focused on GSM audio codecs */
#pragma once
#include <osmocom/core/utils.h>
#include <osmocom/core/sockaddr_str.h>
extern const struct value_string sdp_msg_payload_type_names[];
static inline const char *sdp_msg_payload_type_name(unsigned int payload_type)
{ return get_value_string(sdp_msg_payload_type_names, payload_type); }
int sdp_subtype_name_to_payload_type(const char *subtype_name);
struct sdp_audio_codec {
unsigned int payload_type;
/* Like "GSM", "AMR", "EFR", ... */
char subtype_name[16];
unsigned int rate;
char fmtp[64];
};
struct sdp_audio_codecs {
unsigned int count;
struct sdp_audio_codec codec[16];
};
struct sdp_msg {
struct osmo_sockaddr_str rtp;
unsigned int ptime;
struct sdp_audio_codecs audio_codecs;
};
#define foreach_sdp_audio_codec(/* struct sdp_audio_codec* */ CODEC, \
/* struct sdp_audio_codecs* */ AC) \
for (CODEC = (AC)->codec; \
(CODEC - (AC)->codec) < OSMO_MIN((AC)->count, ARRAY_SIZE((AC)->codec)); \
CODEC++)
const char *sdp_msg_line_end(const char *src);
int sdp_audio_codec_cmp(const struct sdp_audio_codec *a, const struct sdp_audio_codec *b);
struct sdp_audio_codec *sdp_audio_codec_add(struct sdp_audio_codecs *ac, unsigned int payload_type,
const char *subtype_name, unsigned int rate, const char *fmtp);
struct sdp_audio_codec *sdp_audio_codec_add_copy(struct sdp_audio_codecs *ac,
const struct sdp_audio_codec *codec);
int sdp_audio_codec_remove(struct sdp_audio_codecs *ac, const struct sdp_audio_codec *codec);
struct sdp_audio_codec *sdp_audio_codec_by_payload_type(struct sdp_audio_codecs *ac,
unsigned int payload_type, bool create);
struct sdp_audio_codec *sdp_audio_codec_by_descr(struct sdp_audio_codecs *ac,
const struct sdp_audio_codec *codec);
void sdp_audio_codecs_intersection(struct sdp_audio_codecs *ac_dest, const struct sdp_audio_codecs *ac_other,
bool translate_payload_type_numbers);
void sdp_audio_codecs_select(struct sdp_audio_codecs *ac, struct sdp_audio_codec *codec);
int sdp_msg_to_str(char *dst, size_t dst_size, const struct sdp_msg *sdp);
int sdp_msg_from_str(struct sdp_msg *sdp, const char *src);
int sdp_audio_codec_name_buf(char *buf, size_t buflen, const struct sdp_audio_codec *codec);
char *sdp_audio_codec_name_c(void *ctx, const struct sdp_audio_codec *codec);
const char *sdp_audio_codec_name(const struct sdp_audio_codec *codec);
int sdp_audio_codecs_name_buf(char *buf, size_t buflen, const struct sdp_audio_codecs *ac);
char *sdp_audio_codecs_name_c(void *ctx, const struct sdp_audio_codecs *ac);
const char *sdp_audio_codecs_name(const struct sdp_audio_codecs *ac);
int sdp_msg_name_buf(char *buf, size_t buflen, const struct sdp_msg *sdp);
char *sdp_msg_name_c(void *ctx, const struct sdp_msg *sdp);
const char *sdp_msg_name(const struct sdp_msg *sdp);

@ -64,6 +64,7 @@ libmsc_a_SOURCES = \
ran_peer.c \
rrlp.c \
rtp_stream.c \
sdp_msg.c \
silent_call.c \
sms_queue.c \
transaction.c \

@ -0,0 +1,576 @@
/* Minimalistic SDP parse/compose implementation, focused on GSM audio codecs */
/*
* (C) 2019 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* SPDX-License-Identifier: AGPL-3.0+
*
* Author: Neels Hofmeyr
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <errno.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/logging.h>
#include <osmocom/msc/debug.h>
#include <osmocom/msc/sdp_msg.h>
/* Compare name, rate and fmtp, returning typical cmp result: 0 on match, and -1 / 1 on mismatch.
* Do *not* compare the payload_type number.
* The fmtp is only string-compared -- e.g. if AMR parameters appear in a different order, it amounts to a mismatch even
* though all parameters are the same. */
int sdp_audio_codec_cmp(const struct sdp_audio_codec *a, const struct sdp_audio_codec *b)
{
int rc;
if (a == b)
return 0;
if (!a)
return -1;
if (!b)
return 1;
rc = strncmp(a->subtype_name, b->subtype_name, sizeof(a->subtype_name));
if (rc)
return rc;
if (a->rate < b->rate)
return -1;
if (a->rate > b->rate)
return 1;
rc = strncmp(a->fmtp, b->fmtp, sizeof(a->fmtp));
if (rc)
return rc;
return 0;
}
/* Given a predefined fixed payload_type number, add an SDP audio codec entry, if not present yet.
* The payload_type must exist in sdp_msg_payload_type_names.
* Return the audio codec created or already existing for this payload type number.
*/
struct sdp_audio_codec *sdp_audio_codec_add(struct sdp_audio_codecs *ac, unsigned int payload_type,
const char *subtype_name, unsigned int rate, const char *fmtp)
{
struct sdp_audio_codec *codec;
/* Does an entry already exist? */
codec = sdp_audio_codec_by_payload_type(ac, payload_type, false);
if (codec) {
/* Already exists, sanity check */
if (!codec->subtype_name[0])
OSMO_STRLCPY_ARRAY(codec->subtype_name, subtype_name);
else if (strcmp(codec->subtype_name, subtype_name)) {
/* There already is an entry with this payload_type number but a mismatching subtype_name. That is
* weird, rather abort. */
return NULL;
}
if (codec->rate != rate
|| (fmtp && strcmp(fmtp, codec->fmtp))) {
/* Mismatching details. Rather abort */
return NULL;
}
return codec;
}
/* None exists, create codec entry for this payload type number */
codec = sdp_audio_codec_by_payload_type(ac, payload_type, true);
/* NULL means unable to add an entry */
if (!codec)
return NULL;
OSMO_STRLCPY_ARRAY(codec->subtype_name, subtype_name);
if (fmtp)
OSMO_STRLCPY_ARRAY(codec->fmtp, fmtp);
return codec;
}
struct sdp_audio_codec *sdp_audio_codec_add_copy(struct sdp_audio_codecs *ac, const struct sdp_audio_codec *codec)
{
return sdp_audio_codec_add(ac, codec->payload_type, codec->subtype_name, codec->rate,
codec->fmtp[0] ? codec->fmtp : NULL);
}
struct sdp_audio_codec *sdp_audio_codec_by_payload_type(struct sdp_audio_codecs *ac, unsigned int payload_type,
bool create)
{
struct sdp_audio_codec *codec;
foreach_sdp_audio_codec(codec, ac) {
if (codec->payload_type == payload_type)
return codec;
}
if (!create)
return NULL;
/* Not found; codec points after the last entry now. */
if ((codec - ac->codec) >= ARRAY_SIZE(ac->codec))
return NULL;
*codec = (struct sdp_audio_codec){
.payload_type = payload_type,
.rate = 8000,
};
ac->count = (codec - ac->codec) + 1;
return codec;
}
/* Return a given sdp_msg's codec entry that matches the subtype_name, rate and fmtp of the given codec, or NULL if no
* match is found. Comparison is made by sdp_audio_codec_cmp(). */
struct sdp_audio_codec *sdp_audio_codec_by_descr(struct sdp_audio_codecs *ac, const struct sdp_audio_codec *codec)
{
struct sdp_audio_codec *i;
foreach_sdp_audio_codec(i, ac) {
if (!sdp_audio_codec_cmp(i, codec))
return i;
}
return NULL;
}
/* Remove the codec entry pointed at by 'codec'. 'codec' must point at an entry of 'sdp' (to use an external codec
* instance, use sdp_audio_codec_by_descr()).
* Return 0 on success, -ENOENT if codec does not point at the sdp->codec array. */
int sdp_audio_codec_remove(struct sdp_audio_codecs *ac, const struct sdp_audio_codec *codec)
{
struct sdp_audio_codec *i;
if ((codec < ac->codec)
|| ((codec - ac->codec) >= OSMO_MIN(ac->count, ARRAY_SIZE(ac->codec))))
return -ENOENT;
/* Move all following entries one up */
ac->count--;
foreach_sdp_audio_codec(i, ac) {
if (i < codec)
continue;
*i = *(i+1);
}
return 0;
}
/* Convert struct sdp_msg to the actual SDP protocol representation */
int sdp_msg_to_str(char *dst, size_t dst_size, const struct sdp_msg *sdp)
{
const struct sdp_audio_codec *codec;
struct osmo_strbuf sb = { .buf = dst, .len = dst_size };
const char *ip = sdp->rtp.ip[0] ? sdp->rtp.ip : "0.0.0.0";
OSMO_STRBUF_PRINTF(sb,
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 %s\r\n"
"s=GSM Call\r\n"
"c=IN IP4 %s\r\n"
"t=0 0\r\n"
"m=audio %d RTP/AVP",
ip, ip,
sdp->rtp.port);
/* Append all payload type numbers to 'm=audio <port> RTP/AVP 3 4 112' line */
foreach_sdp_audio_codec(codec, &sdp->audio_codecs)
OSMO_STRBUF_PRINTF(sb, " %d", codec->payload_type);
OSMO_STRBUF_PRINTF(sb, "\r\n");
/* Add details for all codecs */
foreach_sdp_audio_codec(codec, &sdp->audio_codecs) {
if (codec->subtype_name[0]) {
OSMO_STRBUF_PRINTF(sb, "a=rtpmap:%d %s/%d\r\n", codec->payload_type, codec->subtype_name,
codec->rate > 0? codec->rate : 8000);
}
if (codec->fmtp[0])
OSMO_STRBUF_PRINTF(sb, "a=fmtp:%d %s\r\n", codec->payload_type, codec->fmtp);
}
OSMO_STRBUF_PRINTF(sb, "a=ptime:%d\r\n", sdp->ptime > 0? sdp->ptime : 20);
return sb.chars_needed;
}
/* Return the first line ending (or the end of the string) at or after the given string position. */
const char *sdp_msg_line_end(const char *src)
{
const char *line_end = strchr(src, '\r');
if (!line_end)
line_end = strchr(src, '\n');
if (!line_end)
line_end = src + strlen(src);
return line_end;
}
/* parse a line like 'a=rtpmap:0 PCMU/8000', 'a=fmtp:112 octet-align=1; mode-set=4', 'a=ptime:20'.
* The src should point at the character after 'a=', e.g. at the start of 'rtpmap', 'fmtp', 'ptime'
*/
int sdp_parse_attrib(struct sdp_msg *sdp, const char *src)
{
unsigned int payload_type;
struct sdp_audio_codec *codec;
#define A_RTPMAP "rtpmap:"
#define A_FMTP "fmtp:"
#define A_PTIME "ptime:"
#define A_RTCP "rtcp:"
#define A_SENDRECV "sendrecv"
#define A_SENDONLY "sendonly"
#define A_RECVONLY "recvonly"
if (osmo_str_startswith(src, A_RTPMAP)) {
char *audio_name;
unsigned int channels = 1;
if (sscanf(src, A_RTPMAP "%u", &payload_type) != 1)
return -EINVAL;
audio_name = strchr(src, ' ');
if (!audio_name || audio_name >= sdp_msg_line_end(src))
return -EINVAL;
codec = sdp_audio_codec_by_payload_type(&sdp->audio_codecs, payload_type, true);
if (!codec)
return -ENOSPC;
if (sscanf(audio_name, " %31[^/]/%u/%u", codec->subtype_name, &codec->rate, &channels) < 1)
return -EINVAL;
if (channels != 1)
return -ENOTSUP;
}
else if (osmo_str_startswith(src, A_FMTP)) {
char *fmtp_str;
const char *line_end = sdp_msg_line_end(src);
if (sscanf(src, A_FMTP "%u", &payload_type) != 1)
return -EINVAL;
fmtp_str = strchr(src, ' ');
if (!fmtp_str)
return -EINVAL;
fmtp_str++;
if (fmtp_str >= line_end)
return -EINVAL;
codec = sdp_audio_codec_by_payload_type(&sdp->audio_codecs, payload_type, true);
if (!codec)
return -ENOSPC;
/* (+1 because osmo_strlcpy() interprets it as size including the '\0') */
osmo_strlcpy(codec->fmtp, fmtp_str, line_end - fmtp_str + 1);
}
else if (osmo_str_startswith(src, A_PTIME)) {
if (sscanf(src, A_PTIME "%u", &sdp->ptime) != 1)
return -EINVAL;
}
else if (osmo_str_startswith(src, A_RTCP)) {
/* TODO? */
}
else if (osmo_str_startswith(src, A_SENDRECV)) {
/* TODO? */
}
else if (osmo_str_startswith(src, A_SENDONLY)) {
/* TODO? */
}
else if (osmo_str_startswith(src, A_RECVONLY)) {
/* TODO? */
}
return 0;
}
const struct value_string sdp_msg_payload_type_names[] = {
{ 0, "PCMU" },
{ 3, "GSM" },
{ 8, "PCMA" },
{ 18, "G729" },
{ 110, "GSM-EFR" },
{ 111, "GSM-HR-08" },
{ 112, "AMR" },
{ 113, "AMR-WB" },
{}
};
/* Return payload type number matching given string ("AMR", "GSM", ...) or negative if not found. */
int sdp_subtype_name_to_payload_type(const char *subtype_name)
{
return get_string_value(sdp_msg_payload_type_names, subtype_name);
}
/* Parse a line like 'm=audio 16398 RTP/AVP 0 3 8 96 112', starting after the '=' */
static int sdp_parse_media_description(struct sdp_msg *sdp, const char *src)
{
unsigned int port;
int i;
const char *payload_type_str;
const char *line_end = sdp_msg_line_end(src);
if (sscanf(src, "audio %u RTP/AVP", &port) < 1)
return -ENOTSUP;
if (port < 0 || port > 0xffff)
return -EINVAL;
sdp->rtp.port = port;
/* skip "audio 12345 RTP/AVP ", i.e. 3 spaces on */
payload_type_str = src;
for (i = 0; i < 3; i++) {
payload_type_str = strchr(payload_type_str, ' ');
if (!payload_type_str)
return -EINVAL;
while (*payload_type_str == ' ')
payload_type_str++;
if (payload_type_str >= line_end)
return -EINVAL;
}
/* Parse listing of payload type numbers after "RTP/AVP" */
while (payload_type_str < line_end) {
unsigned int payload_type;
struct sdp_audio_codec *codec;
const char *subtype_name;
if (sscanf(payload_type_str, "%u", &payload_type) < 1)
return -EINVAL;
codec = sdp_audio_codec_by_payload_type(&sdp->audio_codecs, payload_type, true);
if (!codec)
return -ENOSPC;
/* Fill in subtype name for fixed payload types */
subtype_name = get_value_string_or_null(sdp_msg_payload_type_names, codec->payload_type);
if (subtype_name)
OSMO_STRLCPY_ARRAY(codec->subtype_name, subtype_name);
payload_type_str = strchr(payload_type_str, ' ');
if (!payload_type_str)
payload_type_str = line_end;
while (*payload_type_str == ' ')
payload_type_str++;
}
return 0;
}
/* parse a line like 'c=IN IP4 192.168.11.151' starting after the '=' */
static int sdp_parse_connection_info(struct sdp_msg *sdp, const char *src)
{
char ipv[10];
char addr_str[INET6_ADDRSTRLEN];
if (sscanf(src, "IN %s %s", ipv, addr_str) < 2)
return -EINVAL;
/* supporting only IPv4 */
if (strcmp(ipv, "IP4"))
return -ENOTSUP;
osmo_sockaddr_str_from_str(&sdp->rtp, addr_str, sdp->rtp.port);
return 0;
}
/* Parse SDP string into struct sdp_msg. Return 0 on success, negative on error. */
int sdp_msg_from_str(struct sdp_msg *sdp, const char *src)
{
const char *pos;
*sdp = (struct sdp_msg){};
for (pos = src; pos && *pos; pos++) {
char attrib;
int rc = 0;
if (*pos == '\r' || *pos == '\n')
continue;
/* Expecting only lines starting with 'X='. Not being too strict about it is probably alright. */
if (pos[1] != '=')
goto next_line;
attrib = *pos;
pos += 2;
switch (attrib) {
/* a=... */
case 'a':
rc = sdp_parse_attrib(sdp, pos);
break;
case 'm':
rc = sdp_parse_media_description(sdp, pos);
break;
case 'c':
rc = sdp_parse_connection_info(sdp, pos);
break;
default:
/* ignore any other parameters */
break;
}
if (rc) {
size_t line_len;
const char *line_end = sdp_msg_line_end(pos);
pos -= 2;
line_len = line_end - pos;
switch (rc) {
case -EINVAL:
LOGP(DMNCC, LOGL_ERROR,
"Failed to parse SDP: invalid line: %s\n", osmo_quote_str(pos, line_len));
break;
case -ENOSPC:
LOGP(DMNCC, LOGL_ERROR,
"Failed to parse SDP: no more space for: %s\n", osmo_quote_str(pos, line_len));
break;
case -ENOTSUP:
LOGP(DMNCC, LOGL_ERROR,
"Failed to parse SDP: not supported: %s\n", osmo_quote_str(pos, line_len));
break;
default:
LOGP(DMNCC, LOGL_ERROR,
"Failed to parse SDP: %s\n", osmo_quote_str(pos, line_len));
break;
}
return rc;
}
next_line:
pos = strstr(pos, "\r\n");
if (!pos)
break;
}
return 0;
}
/* Leave only those codecs in 'ac_dest' that are also present in 'ac_other'.
* The matching is made by sdp_audio_codec_cmp(), i.e. payload_type numbers are not compared and fmtp parameters are
* compared 1:1 as plain strings.
* If translate_payload_type_numbers has an effect if ac_dest and ac_other have mismatching payload_type numbers for the
* same SDP codec descriptions. If translate_payload_type_numbers is true, take the payload_type numbers from ac_other.
* If false, keep payload_type numbers in ac_dest unchanged. */
void sdp_audio_codecs_intersection(struct sdp_audio_codecs *ac_dest, const struct sdp_audio_codecs *ac_other,
bool translate_payload_type_numbers)
{
int i;
for (i = 0; i < ac_dest->count; i++) {
struct sdp_audio_codec *codec = &ac_dest->codec[i];
struct sdp_audio_codec *other;
OSMO_ASSERT(i < ARRAY_SIZE(ac_dest->codec));
other = sdp_audio_codec_by_descr((struct sdp_audio_codecs*)ac_other, codec);
if (!other) {
OSMO_ASSERT(sdp_audio_codec_remove(ac_dest, codec) == 0);
i--;
continue;
}
/* Doing payload_type number translation of part of the intersection because it makes the algorithm
* simpler: we already know ac_dest is a subset of ac_other, and there is no need to resolve payload
* type number conflicts. */
if (translate_payload_type_numbers)
codec->payload_type = other->payload_type;
}
}
/* Make sure the given codec is listed as the first codec. 'codec' must be an actual codec entry of the given audio
* codecs list. */
void sdp_audio_codecs_select(struct sdp_audio_codecs *ac, struct sdp_audio_codec *codec)
{
struct sdp_audio_codec tmp;
struct sdp_audio_codec *pos;
OSMO_ASSERT((codec >= ac->codec)
&& ((codec - ac->codec) < OSMO_MIN(ac->count, ARRAY_SIZE(ac->codec))));
/* Already the first? */
if (codec == ac->codec)
return;
tmp = *codec;
for (pos = codec - 1; pos >= ac->codec; pos--)
pos[1] = pos[0];
ac->codec[0] = tmp;
return;
}
/* Short single-line representation of an SDP audio codec, convenient for logging.
* Like "AMR/8000:octet-align=1#122" */
int sdp_audio_codec_name_buf(char *buf, size_t buflen, const struct sdp_audio_codec *codec)
{
struct osmo_strbuf sb = { .buf = buf, .len = buflen };
OSMO_STRBUF_PRINTF(sb, "%s", codec->subtype_name);
if (codec->fmtp[0])
OSMO_STRBUF_PRINTF(sb, ":%s", codec->fmtp);
return sb.chars_needed;
}
char *sdp_audio_codec_name_c(void *ctx, const struct sdp_audio_codec *codec)
{
OSMO_NAME_C_IMPL(ctx, 32, "sdp_audio_codec_name_c-ERROR", sdp_audio_codec_name_buf, codec)
}
const char *sdp_audio_codec_name(const struct sdp_audio_codec *codec)
{
return sdp_audio_codec_name_c(OTC_SELECT, codec);
}
/* Short single-line representation of a list of SDP audio codecs, convenient for logging */
int sdp_audio_codecs_name_buf(char *buf, size_t buflen, const struct sdp_audio_codecs *ac)
{
struct osmo_strbuf sb = { .buf = buf, .len = buflen };
const struct sdp_audio_codec *codec;
if (!ac->count)
OSMO_STRBUF_PRINTF(sb, "(no-codecs)");
foreach_sdp_audio_codec(codec, ac) {
bool first = (codec == ac->codec);
if (!first)
OSMO_STRBUF_PRINTF(sb, ",");
OSMO_STRBUF_APPEND(sb, sdp_audio_codec_name_buf, codec);
}
return sb.chars_needed;
}
char *sdp_audio_codecs_name_c(void *ctx, const struct sdp_audio_codecs *ac)
{
OSMO_NAME_C_IMPL(ctx, 128, "sdp_audio_codecs_name_c-ERROR", sdp_audio_codecs_name_buf, ac)
}
const char *sdp_audio_codecs_name(const struct sdp_audio_codecs *ac)
{
return sdp_audio_codecs_name_c(OTC_SELECT, ac);
}
/* Short single-line representation of an SDP message, convenient for logging */
int sdp_msg_name_buf(char *buf, size_t buflen, const struct sdp_msg *sdp)
{
struct osmo_strbuf sb = { .buf = buf, .len = buflen };
if (!sdp) {
OSMO_STRBUF_PRINTF(sb, "NULL");
return sb.chars_needed;
}
OSMO_STRBUF_PRINTF(sb, OSMO_SOCKADDR_STR_FMT, OSMO_SOCKADDR_STR_FMT_ARGS(&sdp->rtp));
OSMO_STRBUF_PRINTF(sb, "{");
OSMO_STRBUF_APPEND(sb, sdp_audio_codecs_name_buf, &sdp->audio_codecs);
OSMO_STRBUF_PRINTF(sb, "}");
return sb.chars_needed;
}
char *sdp_msg_name_c(void *ctx, const struct sdp_msg *sdp)
{
OSMO_NAME_C_IMPL(ctx, 128, "sdp_msg_name_c-ERROR", sdp_msg_name_buf, sdp)
}
const char *sdp_msg_name(const struct sdp_msg *sdp)
{
return sdp_msg_name_c(OTC_SELECT, sdp);
}

@ -2,6 +2,7 @@ SUBDIRS = \
sms_queue \
msc_vlr \
db_sms \
sdp_msg \
$(NULL)
if BUILD_SMPP

@ -0,0 +1,32 @@
AM_CPPFLAGS = \
$(all_includes) \
-I$(top_srcdir)/include \
$(NULL)
AM_CFLAGS = \
-Wall \
-ggdb3 \
$(LIBOSMOCORE_CFLAGS) \
$(NULL)
LDADD = \
$(top_builddir)/src/libmsc/libmsc.a \
$(LIBOSMOCORE_LIBS) \
$(NULL)
EXTRA_DIST = \
sdp_msg_test.ok \
sdp_msg_test.err \
$(NULL)
noinst_PROGRAMS = \
sdp_msg_test \
$(NULL)
sdp_msg_test_SOURCES = \
sdp_msg_test.c \
$(NULL)
.PHONY: update_exp
update_exp:
$(builddir)/sdp_msg_test >$(srcdir)/sdp_msg_test.ok 2>$(srcdir)/sdp_msg_test.err

@ -0,0 +1,569 @@
#include <stdio.h>
#include <string.h>
#include <osmocom/core/utils.h>
#include <osmocom/msc/sdp_msg.h>
struct sdp_test_data {
const char *sdp_input;
const char *expect_sdp_str;
};
static void dump_sdp(const char *str, const char *prefix)
{
while (str && *str) {
const char *line_end = sdp_msg_line_end(str);
while (*line_end == '\r' || *line_end == '\n')
line_end++;
printf("%s%s\n", prefix, osmo_escape_str(str, line_end - str));
str = line_end;
}
}
struct sdp_test_data sdp_tests[] = {
{
"v=0\r\n"
"o=- 5628250 5628250 IN IP4 192.168.11.121\r\n"
"s=-\r\n"
"c=IN IP4 192.168.11.121\r\n"
"t=0 0\r\n"
"m=audio 10020 RTP/AVP 18 0 2 4 8 96 97 98 100 101\r\n"
"a=rtpmap:18 G729/8000\r\n"
"a=rtpmap:0 PCMU/8000\r\n"
"a=rtpmap:2 G726-32/8000\r\n"
"a=rtpmap:4 G723/8000\r\n"
"a=rtpmap:8 PCMA/8000\r\n"
"a=rtpmap:96 G726-40/8000\r\n"
"a=rtpmap:97 G726-24/8000\r\n"
"a=rtpmap:98 G726-16/8000\r\n"
"a=rtpmap:100 NSE/8000\r\n"
"a=fmtp:100 192-193\r\n"
"a=rtpmap:101 telephone-event/8000\r\n"
"a=fmtp:101 0-15\r\n"
"a=ptime:20\r\n"
"a=sendrecv\r\n"
,
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 192.168.11.121\r\n"
"s=GSM Call\r\n"
"c=IN IP4 192.168.11.121\r\n"
"t=0 0\r\n"
"m=audio 10020 RTP/AVP 18 0 2 4 8 96 97 98 100 101\r\n"
"a=rtpmap:18 G729/8000\r\n"
"a=rtpmap:0 PCMU/8000\r\n"
"a=rtpmap:2 G726-32/8000\r\n"
"a=rtpmap:4 G723/8000\r\n"
"a=rtpmap:8 PCMA/8000\r\n"
"a=rtpmap:96 G726-40/8000\r\n"
"a=rtpmap:97 G726-24/8000\r\n"
"a=rtpmap:98 G726-16/8000\r\n"
"a=rtpmap:100 NSE/8000\r\n"
"a=fmtp:100 192-193\r\n"
"a=rtpmap:101 telephone-event/8000\r\n"
"a=fmtp:101 0-15\r\n"
"a=ptime:20\r\n"
,
},
{
"v=0\r\n"
"o=FooBar 1565090289 1565090290 IN IP4 192.168.11.151\r\n"
"s=FooBar\r\n"
"c=IN IP4 192.168.11.151\r\n"
"t=0 0\r\n"
"m=audio 16398 RTP/AVP 98\r\n"
"a=rtpmap:98 AMR/8000\r\n"
"a=fmtp:98 octet-align=1; mode-set=4\r\n"
"a=ptime:20\r\n"
"a=rtcp:16399 IN IP4 192.168.11.151\r\n"
,
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 192.168.11.151\r\n"
"s=GSM Call\r\n"
"c=IN IP4 192.168.11.151\r\n"
"t=0 0\r\n"
"m=audio 16398 RTP/AVP 98\r\n"
"a=rtpmap:98 AMR/8000\r\n"
"a=fmtp:98 octet-align=1; mode-set=4\r\n"
"a=ptime:20\r\n"
,
},
{
"v=0\r\n"
"o=FooBar 1565090289 1565090290 IN IP4 192.168.11.151\r\n"
"s=FooBar\r\n"
"c=IN IP4 192.168.11.140\r\n"
"t=0 0\r\n"
"m=audio 30436 RTP/AVP 18 0 4 8 101\r\n"
"a=rtpmap:18 G729/8000\r\n"
"a=rtpmap:0 PCMU/8000\r\n"
"a=rtpmap:4 G723/8000\r\n"
"a=rtpmap:8 PCMA/8000\r\n"
"a=rtpmap:101 telephone-event/8000\r\n"
"a=fmtp:101 0-15\r\n"
"a=sendrecv\r\n"
"a=rtcp:30437\r\n"
"a=ptime:20\r\n"
,
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 192.168.11.140\r\n" /* <- NOTE: loses the 'o=' address, uses only 'c=' */
"s=GSM Call\r\n"
"c=IN IP4 192.168.11.140\r\n"
"t=0 0\r\n"
"m=audio 30436 RTP/AVP 18 0 4 8 101\r\n"
"a=rtpmap:18 G729/8000\r\n"
"a=rtpmap:0 PCMU/8000\r\n"
"a=rtpmap:4 G723/8000\r\n"
"a=rtpmap:8 PCMA/8000\r\n"
"a=rtpmap:101 telephone-event/8000\r\n"
"a=fmtp:101 0-15\r\n"
"a=ptime:20\r\n"
,
},
};
void test_parse_and_compose()
{
int i;
bool ok = true;
printf("\n\n%s\n", __func__);
for (i = 0; i < ARRAY_SIZE(sdp_tests); i++) {
struct sdp_test_data *t = &sdp_tests[i];
struct sdp_msg sdp = {};
char str[1024];
printf("\n[%d]\n", i);
dump_sdp(t->sdp_input, "sdp input: ");
sdp_msg_from_str(&sdp, t->sdp_input);
sdp_msg_to_str(str, sizeof(str), &sdp);
dump_sdp(str, "sdp_msg_to_str: ");
if (strcmp(str, t->expect_sdp_str)) {
int j;
ok = false;
printf("ERROR:\n");
dump_sdp(t->expect_sdp_str, "expect_sdp_str: ");
for (j = 0; t->expect_sdp_str[j]; j++) {
if (t->expect_sdp_str[j] != str[j]) {
printf("ERROR at position %d, at:\n", j);
dump_sdp(str + j, " mismatch: ");
break;
}
}
} else
printf("[%d] ok\n", i);
}
OSMO_ASSERT(ok);
}
struct sdp_intersect_test_data {
const char *descr;
const char *sdp_a;
const char *sdp_b;
const char *expect_intersection;
};
#define SDP_1 \
"v=0\r\n" \
"o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n" \
"s=GSM Call\r\n" \
"c=IN IP4 23.42.23.42\r\n" \
"t=0 0\r\n" \
"m=audio 30436 RTP/AVP 112 3 111 110\r\n" \
"a=rtpmap:112 AMR/8000\r\n" \
"a=fmtp:112 octet-align=1\r\n" \
"a=rtpmap:3 GSM/8000\r\n" \
"a=rtpmap:111 GSM-HR-08/8000\r\n" \
"a=rtpmap:110 GSM-EFR/8000\r\n" \
"a=ptime:20\r\n"
#define SDP_2 \
"v=0\r\n" \
"o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n" \
"s=GSM Call\r\n" \
"c=IN IP4 23.42.23.42\r\n" \
"t=0 0\r\n" \
"m=audio 30436 RTP/AVP 112 110\r\n" \
"a=rtpmap:112 AMR/8000\r\n" \
"a=fmtp:112 octet-align=1\r\n" \
"a=rtpmap:110 GSM-EFR/8000\r\n" \
"a=ptime:20\r\n"
#define SDP_3 \
"v=0\r\n" \
"o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n" \
"s=GSM Call\r\n" \
"c=IN IP4 23.42.23.42\r\n" \
"t=0 0\r\n" \
"m=audio 30436 RTP/AVP 3 111\r\n" \
"a=rtpmap:3 GSM/8000\r\n" \
"a=rtpmap:111 GSM-HR-08/8000\r\n" \
"a=ptime:20\r\n"
struct sdp_intersect_test_data sdp_intersect_tests[] = {
{
"identical codecs lead to no change"
,
SDP_1
,
"c=IN IP4 5.6.7.8\r\n" \
"m=audio 12345 RTP/AVP 112 3 111 110\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
,
SDP_1
},
{
"identical codecs in different order also lead to no change"
,
SDP_1
,
"c=IN IP4 5.6.7.8\r\n" \
"m=audio 12345 RTP/AVP 3 110 111 112\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1\r\n"
,
SDP_1
},
{
"identical codecs with mismatching payload type numbers also lead to no change"
,
SDP_1
,
"c=IN IP4 5.6.7.8\r\n" \
"m=audio 12345 RTP/AVP 96 97 98 99\r\n"
"a=rtpmap:96 GSM/8000\r\n"
"a=rtpmap:97 GSM-EFR/8000\r\n"
"a=rtpmap:98 GSM-HR-08/8000\r\n"
"a=rtpmap:99 AMR/8000\r\n"
"a=fmtp:99 octet-align=1\r\n"
,
SDP_1
},
{
"identical codecs plus some extra codecs also lead to no change"
,
SDP_1
,
"c=IN IP4 5.6.7.8\r\n" \
"m=audio 12345 RTP/AVP 8 0 96 97 98 99\r\n"
"a=rtpmap:8 PCMA/8000\r\n"
"a=rtpmap:0 PCMU/8000\r\n"
"a=rtpmap:96 GSM/8000\r\n"
"a=rtpmap:97 GSM-EFR/8000\r\n"
"a=rtpmap:98 GSM-HR-08/8000\r\n"
"a=rtpmap:99 AMR/8000\r\n"
"a=fmtp:99 octet-align=1\r\n"
,
SDP_1
},
{
"some codecs removed",
SDP_1,
SDP_2,
SDP_2,
},
{
"other codecs removed",
SDP_1,
SDP_3,
SDP_3,
},
{
"all codecs removed",
SDP_1
,
"s=empty"
,
"v=0\r\n" \
"o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n" \
"s=GSM Call\r\n" \
"c=IN IP4 23.42.23.42\r\n" \
"t=0 0\r\n" \
"m=audio 30436 RTP/AVP\r\n" \
"a=ptime:20\r\n"
},
{
"some real world test case"
,
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 0.0.0.0\r\n"
"s=GSM Call\r\n"
"c=IN IP4 0.0.0.0\r\n"
"t=0 0\r\n"
"m=audio 0 RTP/AVP 112 113 110 3 111\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1;mode-set=0,1,2,3\r\n"
"a=rtpmap:113 AMR-WB/8000\r\n"
"a=fmtp:113 octet-align=1\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=ptime:20\r\n"
,
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 0.0.0.0\r\n"
"s=GSM Call\r\n"
"c=IN IP4 0.0.0.0\r\n"
"t=0 0\r\n"
"m=audio 0 RTP/AVP 112 113 110 3 111\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1;mode-set=0,1,2,3\r\n"
"a=rtpmap:113 AMR-WB/8000\r\n"
"a=fmtp:113 octet-align=1\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=ptime:20\r\n"
,
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 0.0.0.0\r\n"
"s=GSM Call\r\n"
"c=IN IP4 0.0.0.0\r\n"
"t=0 0\r\n"
"m=audio 0 RTP/AVP 112 113 110 3 111\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1;mode-set=0,1,2,3\r\n"
"a=rtpmap:113 AMR-WB/8000\r\n"
"a=fmtp:113 octet-align=1\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=ptime:20\r\n"
}
};
const char *sdp_msg_logstr(const struct sdp_msg *sdp)
{
static char buf[1024];
sdp_msg_to_str(buf, sizeof(buf), sdp);
return buf;
}
static void test_intersect()
{
int i;
bool ok = true;
int rc;
printf("\n\n%s\n", __func__);
for (i = 0; i < ARRAY_SIZE(sdp_intersect_tests); i++) {
struct sdp_intersect_test_data *t = &sdp_intersect_tests[i];
struct sdp_msg sdp_a = {};
struct sdp_msg sdp_b = {};
char str[1024];
printf("\n[%d] %s\n", i, t->descr);
dump_sdp(t->sdp_a, "SDP A: ");
dump_sdp(t->sdp_b, " SDP B: ");
rc = sdp_msg_from_str(&sdp_a, t->sdp_a);
if (rc) {
printf("ERROR parsing SDP A: %d\n", rc);
break;
}
dump_sdp(sdp_msg_logstr(&sdp_a), "parsed SDP A: ");
rc = sdp_msg_from_str(&sdp_b, t->sdp_b);
if (rc) {
printf("ERROR parsing SDP A: %d\n", rc);
break;
}
dump_sdp(sdp_msg_logstr(&sdp_b), "parsed SDP B: ");
sdp_audio_codecs_intersection(&sdp_a.audio_codecs, &sdp_b.audio_codecs, false);
sdp_msg_to_str(str, sizeof(str), &sdp_a);
dump_sdp(str, "sdp_msg_intersection(a,b): ");
if (strcmp(str, t->expect_intersection)) {
int j;
ok = false;
printf("ERROR:\n");
dump_sdp(t->expect_intersection, "expect_intersection: ");
for (j = 0; t->expect_intersection[j]; j++) {
if (t->expect_intersection[j] != str[j]) {
printf("ERROR at position %d, at:\n", j);
dump_sdp(str + j, " mismatch: ");
break;
}
}
} else
printf("[%d] ok\n", i);
}
OSMO_ASSERT(ok);
}
struct sdp_select_test_data {
const char *sdp;
unsigned int select_payload_type;
const char *expect_sdp;
};
struct sdp_select_test_data sdp_select_tests[] = {
{
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n"
"s=GSM Call\r\n"
"c=IN IP4 23.42.23.42\r\n"
"t=0 0\r\n"
"m=audio 30436 RTP/AVP 112 3 111 110\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
"a=ptime:20\r\n"
,
112,
NULL
},
{
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n"
"s=GSM Call\r\n"
"c=IN IP4 23.42.23.42\r\n"
"t=0 0\r\n"
"m=audio 30436 RTP/AVP 112 3 111 110\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
"a=ptime:20\r\n"
,
3,
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n"
"s=GSM Call\r\n"
"c=IN IP4 23.42.23.42\r\n"
"t=0 0\r\n"
"m=audio 30436 RTP/AVP 3 112 111 110\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
"a=ptime:20\r\n"
},
{
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n"
"s=GSM Call\r\n"
"c=IN IP4 23.42.23.42\r\n"
"t=0 0\r\n"
"m=audio 30436 RTP/AVP 112 3 111 110\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
"a=ptime:20\r\n"
,
111,
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n"
"s=GSM Call\r\n"
"c=IN IP4 23.42.23.42\r\n"
"t=0 0\r\n"
"m=audio 30436 RTP/AVP 111 112 3 110\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
"a=ptime:20\r\n"
},
{
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n"
"s=GSM Call\r\n"
"c=IN IP4 23.42.23.42\r\n"
"t=0 0\r\n"
"m=audio 30436 RTP/AVP 112 3 111 110\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
"a=ptime:20\r\n"
,
110,
"v=0\r\n"
"o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n"
"s=GSM Call\r\n"
"c=IN IP4 23.42.23.42\r\n"
"t=0 0\r\n"
"m=audio 30436 RTP/AVP 110 112 3 111\r\n"
"a=rtpmap:110 GSM-EFR/8000\r\n"
"a=rtpmap:112 AMR/8000\r\n"
"a=fmtp:112 octet-align=1\r\n"
"a=rtpmap:3 GSM/8000\r\n"
"a=rtpmap:111 GSM-HR-08/8000\r\n"
"a=ptime:20\r\n"
},
};
static void test_select()
{
int i;
bool ok = true;
int rc;
printf("\n\n%s\n", __func__);
for (i = 0; i < ARRAY_SIZE(sdp_select_tests); i++) {
struct sdp_select_test_data *t = &sdp_select_tests[i];
struct sdp_msg sdp = {};
struct sdp_audio_codec *codec;
char buf[1024];
printf("\n[%d]\n", i);
rc = sdp_msg_from_str(&sdp, t->sdp);
if (rc) {
printf("ERROR parsing SDP: %d\n", rc);
break;
}
printf("SDP: %s\n", sdp_audio_codecs_name(&sdp.audio_codecs));
codec = sdp_audio_codec_by_payload_type(&sdp.audio_codecs, t->select_payload_type, false);
OSMO_ASSERT(codec);
printf("Select: %s\n", sdp_audio_codec_name(codec));
sdp_audio_codecs_select(&sdp.audio_codecs, codec);
printf("SDP: %s\n", sdp_audio_codecs_name(&sdp.audio_codecs));
sdp_msg_to_str(buf, sizeof(buf), &sdp);
if (strcmp(buf, t->expect_sdp ? : t->sdp)) {
int j;
ok = false;
printf("ERROR:\n");
dump_sdp(buf, "selection result: ");
dump_sdp(t->expect_sdp, "expect result: ");
for (j = 0; t->expect_sdp[j]; j++) {
if (t->expect_sdp[j] != buf[j]) {
printf("ERROR at position %d, at:\n", j);
dump_sdp(buf + j, " mismatch: ");
break;
}
}
} else
printf("[%d] ok\n", i);
}
OSMO_ASSERT(ok);
}
int main(void)
{
test_parse_and_compose();
test_intersect();
test_select();
return 0;
}

@ -0,0 +1,590 @@
test_parse_and_compose
[0]
sdp input: v=0\r\n
sdp input: o=- 5628250 5628250 IN IP4 192.168.11.121\r\n
sdp input: s=-\r\n
sdp input: c=IN IP4 192.168.11.121\r\n
sdp input: t=0 0\r\n
sdp input: m=audio 10020 RTP/AVP 18 0 2 4 8 96 97 98 100 101\r\n
sdp input: a=rtpmap:18 G729/8000\r\n
sdp input: a=rtpmap:0 PCMU/8000\r\n
sdp input: a=rtpmap:2 G726-32/8000\r\n
sdp input: a=rtpmap:4 G723/8000\r\n
sdp input: a=rtpmap:8 PCMA/8000\r\n
sdp input: a=rtpmap:96 G726-40/8000\r\n
sdp input: a=rtpmap:97 G726-24/8000\r\n
sdp input: a=rtpmap:98 G726-16/8000\r\n
sdp input: a=rtpmap:100 NSE/8000\r\n
sdp input: a=fmtp:100 192-193\r\n
sdp input: a=rtpmap:101 telephone-event/8000\r\n
sdp input: a=fmtp:101 0-15\r\n
sdp input: a=ptime:20\r\n
sdp input: a=sendrecv\r\n
sdp_msg_to_str: v=0\r\n
sdp_msg_to_str: o=OsmoMSC 0 0 IN IP4 192.168.11.121\r\n
sdp_msg_to_str: s=GSM Call\r\n
sdp_msg_to_str: c=IN IP4 192.168.11.121\r\n
sdp_msg_to_str: t=0 0\r\n
sdp_msg_to_str: m=audio 10020 RTP/AVP 18 0 2 4 8 96 97 98 100 101\r\n
sdp_msg_to_str: a=rtpmap:18 G729/8000\r\n
sdp_msg_to_str: a=rtpmap:0 PCMU/8000\r\n
sdp_msg_to_str: a=rtpmap:2 G726-32/8000\r\n
sdp_msg_to_str: a=rtpmap:4 G723/8000\r\n
sdp_msg_to_str: a=rtpmap:8 PCMA/8000\r\n
sdp_msg_to_str: a=rtpmap:96 G726-40/8000\r\n
sdp_msg_to_str: a=rtpmap:97 G726-24/8000\r\n
sdp_msg_to_str: a=rtpmap:98 G726-16/8000\r\n
sdp_msg_to_str: a=rtpmap:100 NSE/8000\r\n
sdp_msg_to_str: a=fmtp:100 192-193\r\n
sdp_msg_to_str: a=rtpmap:101 telephone-event/8000\r\n
sdp_msg_to_str: a=fmtp:101 0-15\r\n
sdp_msg_to_str: a=ptime:20\r\n
[0] ok
[1]
sdp input: v=0\r\n
sdp input: o=FooBar 1565090289 1565090290 IN IP4 192.168.11.151\r\n
sdp input: s=FooBar\r\n
sdp input: c=IN IP4 192.168.11.151\r\n
sdp input: t=0 0\r\n
sdp input: m=audio 16398 RTP/AVP 98\r\n
sdp input: a=rtpmap:98 AMR/8000\r\n
sdp input: a=fmtp:98 octet-align=1; mode-set=4\r\n
sdp input: a=ptime:20\r\n
sdp input: a=rtcp:16399 IN IP4 192.168.11.151\r\n
sdp_msg_to_str: v=0\r\n
sdp_msg_to_str: o=OsmoMSC 0 0 IN IP4 192.168.11.151\r\n
sdp_msg_to_str: s=GSM Call\r\n
sdp_msg_to_str: c=IN IP4 192.168.11.151\r\n
sdp_msg_to_str: t=0 0\r\n
sdp_msg_to_str: m=audio 16398 RTP/AVP 98\r\n
sdp_msg_to_str: a=rtpmap:98 AMR/8000\r\n
sdp_msg_to_str: a=fmtp:98 octet-align=1; mode-set=4\r\n
sdp_msg_to_str: a=ptime:20\r\n
[1] ok
[2]
sdp input: v=0\r\n
sdp input: o=FooBar 1565090289 1565090290 IN IP4 192.168.11.151\r\n
sdp input: s=FooBar\r\n
sdp input: c=IN IP4 192.168.11.140\r\n
sdp input: t=0 0\r\n
sdp input: m=audio 30436 RTP/AVP 18 0 4 8 101\r\n
sdp input: a=rtpmap:18 G729/8000\r\n
sdp input: a=rtpmap:0 PCMU/8000\r\n
sdp input: a=rtpmap:4 G723/8000\r\n
sdp input: a=rtpmap:8 PCMA/8000\r\n
sdp input: a=rtpmap:101 telephone-event/8000\r\n
sdp input: a=fmtp:101 0-15\r\n
sdp input: a=sendrecv\r\n
sdp input: a=rtcp:30437\r\n
sdp input: a=ptime:20\r\n
sdp_msg_to_str: v=0\r\n
sdp_msg_to_str: o=OsmoMSC 0 0 IN IP4 192.168.11.140\r\n
sdp_msg_to_str: s=GSM Call\r\n
sdp_msg_to_str: c=IN IP4 192.168.11.140\r\n
sdp_msg_to_str: t=0 0\r\n
sdp_msg_to_str: m=audio 30436 RTP/AVP 18 0 4 8 101\r\n
sdp_msg_to_str: a=rtpmap:18 G729/8000\r\n
sdp_msg_to_str: a=rtpmap:0 PCMU/8000\r\n
sdp_msg_to_str: a=rtpmap:4 G723/8000\r\n
sdp_msg_to_str: a=rtpmap:8 PCMA/8000\r\n
sdp_msg_to_str: a=rtpmap:101 telephone-event/8000\r\n
sdp_msg_to_str: a=fmtp:101 0-15\r\n
sdp_msg_to_str: a=ptime:20\r\n
[2] ok
test_intersect
[0] identical codecs lead to no change
SDP A: v=0\r\n
SDP A: o=OsmoMSC 0 0 IN IP4 23.42.23.42\r\n
SDP A: s=GSM Call\r\n
SDP A: c=IN IP4 23.42.23.42\r\n
SDP A: t=0 0\r\n
SDP A: m=audio 30436 RTP/AVP 112 3 111 110\r\n
SDP A: a=rtpmap:112 AMR/8000\r\n
SDP A: a=fmtp:112 octet-align=1\r\n
SDP A: a=rtpmap:3 GSM/8000\r\n
SDP A: a=rtpmap:111 GSM-HR-08/8000\r\n
SDP A: a=rtpmap:110 GSM-EFR/8000\r\n
SDP A: a=ptime:20\r\n
SDP B: c=IN IP4 5.6.7.8\r\n
SDP B: m=audio 12345 RTP/AVP 112 3 111 110\r\n