| /* Minimalistic SDP parse/compose implementation, focused on GSM audio codecs */ |
| /* |
| * (C) 2019 by sysmocom - s.f.m.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> |
| |
| bool sdp_audio_codec_is_set(const struct sdp_audio_codec *a) |
| { |
| return a && a->subtype_name[0]; |
| } |
| |
| /* Compare name, rate and fmtp, returning typical cmp result: 0 on match, and -1 / 1 on mismatch. |
| * If cmp_fmtp is false, do *not* compare the fmtp string; if true, compare fmtp 1:1 as strings. |
| * If cmp_payload_type is false, 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, |
| bool cmp_fmtp, bool cmp_payload_type) |
| { |
| int cmp; |
| if (a == b) |
| return 0; |
| if (!a) |
| return -1; |
| if (!b) |
| return 1; |
| cmp = strncmp(a->subtype_name, b->subtype_name, sizeof(a->subtype_name)); |
| if (cmp) |
| return cmp; |
| cmp = OSMO_CMP(a->rate, b->rate); |
| if (cmp) |
| return cmp; |
| if (cmp_fmtp) { |
| cmp = strncmp(a->fmtp, b->fmtp, sizeof(a->fmtp)); |
| if (cmp) |
| return cmp; |
| } |
| if (cmp_payload_type) { |
| cmp = OSMO_CMP(a->payload_type, b->payload_type); |
| if (cmp) |
| return cmp; |
| } |
| return 0; |
| } |
| |
| /* Compare two lists of audio codecs, returning typical cmp result: 0 on match, and -1 / 1 on mismatch. |
| * The ordering in the two lists may differ, except that the first codec in 'a' must also be the first codec in 'b'. |
| * This is because the first codec typically expresses the preferred codec to use. |
| * If cmp_fmtp is false, do *not* compare the fmtp strings; if true, compare fmtp 1:1 as strings. |
| * If cmp_payload_type is false, do *not* compare the payload_type numbers. |
| * 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_codecs_cmp(const struct sdp_audio_codecs *a, const struct sdp_audio_codecs *b, |
| bool cmp_fmtp, bool cmp_payload_type) |
| { |
| const struct sdp_audio_codec *codec_a; |
| const struct sdp_audio_codec *codec_b; |
| int cmp; |
| if (a == b) |
| return 0; |
| if (!a) |
| return -1; |
| if (!b) |
| return 1; |
| |
| cmp = OSMO_CMP(a->count, b->count); |
| if (cmp) |
| return cmp; |
| |
| if (!a->count) |
| return 0; |
| |
| /* The first codec is the "chosen" codec and should match. The others may appear in different order. */ |
| cmp = sdp_audio_codec_cmp(&a->codec[0], &b->codec[0], cmp_fmtp, cmp_payload_type); |
| if (cmp) |
| return cmp; |
| |
| /* See if each codec in a is also present in b */ |
| sdp_audio_codecs_foreach(codec_a, a) { |
| bool match_found = false; |
| sdp_audio_codecs_foreach(codec_b, b) { |
| if (!sdp_audio_codec_cmp(codec_a, codec_b, cmp_fmtp, cmp_payload_type)) { |
| match_found = true; |
| break; |
| } |
| } |
| if (!match_found) |
| return -1; |
| } |
| |
| 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_codecs_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_codecs_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_codecs_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); |
| codec->rate = rate; |
| return codec; |
| } |
| |
| struct sdp_audio_codec *sdp_audio_codecs_add_copy(struct sdp_audio_codecs *ac, const struct sdp_audio_codec *codec) |
| { |
| return sdp_audio_codecs_add(ac, codec->payload_type, codec->subtype_name, codec->rate, |
| codec->fmtp[0] ? codec->fmtp : NULL); |
| } |
| |
| /* Find or create an entry for the given payload_type number in the given list of codecs. |
| * If the given payload_type number is already present in ac, return the first matching entry. |
| * If no such payload_type number is present: a) return NULL if create == false; |
| * b) If create == true, add a mostly empty codec entry to the end of ac with the given payload_type number, and return |
| * the created entry. |
| * If create == true, a NULL return value means that there was no unused entry left in ac to add this payload_type. |
| */ |
| struct sdp_audio_codec *sdp_audio_codecs_by_payload_type(struct sdp_audio_codecs *ac, unsigned int payload_type, |
| bool create) |
| { |
| struct sdp_audio_codec *codec; |
| sdp_audio_codecs_foreach(codec, ac) { |
| if (codec->payload_type == payload_type) |
| return codec; |
| } |
| if (!create) |
| return NULL; |
| |
| if (ac->count >= ARRAY_SIZE(ac->codec)) |
| return NULL; |
| |
| codec = &ac->codec[ac->count]; |
| *codec = (struct sdp_audio_codec){ |
| .payload_type = payload_type, |
| .rate = 8000, |
| }; |
| ac->count++; |
| return codec; |
| } |
| |
| /* Return a given sdp_msg's codec entry that matches the subtype_name and rate of the given codec, or NULL if no |
| * match is found. Comparison is made by sdp_audio_codec_cmp(cmp_payload_type=false). */ |
| struct sdp_audio_codec *sdp_audio_codecs_by_descr(struct sdp_audio_codecs *ac, const struct sdp_audio_codec *codec) |
| { |
| struct sdp_audio_codec *i; |
| sdp_audio_codecs_foreach(i, ac) { |
| if (!sdp_audio_codec_cmp(i, codec, false, false)) |
| return i; |
| } |
| return NULL; |
| } |
| |
| /* Remove the codec entry pointed at by 'codec'. 'codec' must point at an entry of 'ac'. |
| * To use any external codec instance, use sdp_audio_codecs_remove(ac, sdp_audio_codecs_by_descr(ac, codec)). |
| * Return 0 on success, -ENOENT if codec does not point at the sdp->codec array. */ |
| int sdp_audio_codecs_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--; |
| sdp_audio_codecs_foreach(i, ac) { |
| if (i < codec) |
| continue; |
| *i = *(i+1); |
| } |
| return 0; |
| } |
| |
| static const char * const sdp_mode_str[] = { |
| [SDP_MODE_UNSET] = "-", |
| [SDP_MODE_SENDONLY] = "sendonly", |
| [SDP_MODE_RECVONLY] = "recvonly", |
| [SDP_MODE_SENDRECV] = "sendrecv", |
| [SDP_MODE_INACTIVE] = "inactive", |
| }; |
| |
| /* Convert struct sdp_msg to the actual SDP protocol representation */ |
| int sdp_msg_to_sdp_str_buf(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; |
| char ipv; |
| |
| if (!sdp) { |
| OSMO_STRBUF_PRINTF(sb, "%s", ""); |
| return sb.chars_needed; |
| } |
| |
| ip = sdp->rtp.ip[0] ? sdp->rtp.ip : "0.0.0.0"; |
| ipv = (osmo_ip_str_type(ip) == AF_INET6) ? '6' : '4'; |
| |
| OSMO_STRBUF_PRINTF(sb, |
| "v=0\r\n" |
| "o=OsmoMSC 0 0 IN IP%c %s\r\n" |
| "s=GSM Call\r\n" |
| "c=IN IP%c %s\r\n" |
| "t=0 0\r\n" |
| "m=audio %d RTP/AVP", |
| ipv, ip, ipv, ip, |
| sdp->rtp.port); |
| |
| /* Append all payload type numbers to 'm=audio <port> RTP/AVP 3 4 112' line */ |
| sdp_audio_codecs_foreach(codec, &sdp->audio_codecs) |
| OSMO_STRBUF_PRINTF(sb, " %d", codec->payload_type); |
| OSMO_STRBUF_PRINTF(sb, "\r\n"); |
| |
| /* Add details for all codecs */ |
| sdp_audio_codecs_foreach(codec, &sdp->audio_codecs) { |
| if (!sdp_audio_codec_is_set(codec)) |
| continue; |
| 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); |
| |
| if (sdp->mode != SDP_MODE_UNSET && sdp->mode < ARRAY_SIZE(sdp_mode_str)) |
| OSMO_STRBUF_PRINTF(sb, "a=%s\r\n", sdp_mode_str[sdp->mode]); |
| |
| 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:" |
| |
| if (osmo_str_startswith(src, A_RTPMAP)) { |
| /* "a=rtpmap:3 GSM/8000" */ |
| 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_codecs_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)) { |
| /* "a=fmtp:112 octet-align=1;mode-set=0,1,2,3" */ |
| 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_codecs_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)) { |
| /* "a=ptime:20" */ |
| 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, sdp_mode_str[SDP_MODE_SENDRECV])) { |
| /* "a=sendrecv" */ |
| sdp->mode = SDP_MODE_SENDRECV; |
| } |
| |
| else if (osmo_str_startswith(src, sdp_mode_str[SDP_MODE_SENDONLY])) { |
| /* "a=sendonly" */ |
| sdp->mode = SDP_MODE_SENDONLY; |
| } |
| |
| else if (osmo_str_startswith(src, sdp_mode_str[SDP_MODE_RECVONLY])) { |
| /* "a=recvonly" */ |
| sdp->mode = SDP_MODE_RECVONLY; |
| } |
| |
| else if (osmo_str_startswith(src, sdp_mode_str[SDP_MODE_INACTIVE])) { |
| /* "a=inactive" */ |
| sdp->mode = SDP_MODE_INACTIVE; |
| } |
| |
| 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 > 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_codecs_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_sdp_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(cmp_payload_type=false), 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_codecs_by_descr((struct sdp_audio_codecs *)ac_other, codec); |
| |
| if (!other) { |
| OSMO_ASSERT(sdp_audio_codecs_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_to_str_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->rate != 8000) |
| OSMO_STRBUF_PRINTF(sb, "/%u", codec->rate); |
| if (codec->fmtp[0]) |
| OSMO_STRBUF_PRINTF(sb, ":%s", codec->fmtp); |
| OSMO_STRBUF_PRINTF(sb, "#%d", codec->payload_type); |
| return sb.chars_needed; |
| } |
| |
| char *sdp_audio_codec_to_str_c(void *ctx, const struct sdp_audio_codec *codec) |
| { |
| OSMO_NAME_C_IMPL(ctx, 32, "sdp_audio_codec_to_str_c-ERROR", sdp_audio_codec_to_str_buf, codec) |
| } |
| |
| const char *sdp_audio_codec_to_str(const struct sdp_audio_codec *codec) |
| { |
| return sdp_audio_codec_to_str_c(OTC_SELECT, codec); |
| } |
| |
| /* Short single-line representation of a list of SDP audio codecs, convenient for logging */ |
| int sdp_audio_codecs_to_str_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)"); |
| sdp_audio_codecs_foreach(codec, ac) { |
| bool first = (codec == ac->codec); |
| if (!first) |
| OSMO_STRBUF_PRINTF(sb, ","); |
| OSMO_STRBUF_APPEND(sb, sdp_audio_codec_to_str_buf, codec); |
| } |
| return sb.chars_needed; |
| } |
| |
| char *sdp_audio_codecs_to_str_c(void *ctx, const struct sdp_audio_codecs *ac) |
| { |
| OSMO_NAME_C_IMPL(ctx, 128, "sdp_audio_codecs_to_str_c-ERROR", sdp_audio_codecs_to_str_buf, ac) |
| } |
| |
| const char *sdp_audio_codecs_to_str(const struct sdp_audio_codecs *ac) |
| { |
| return sdp_audio_codecs_to_str_c(OTC_SELECT, ac); |
| } |
| |
| /* Short single-line representation of an SDP message, convenient for logging */ |
| int sdp_msg_to_str_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_to_str_buf, &sdp->audio_codecs); |
| if (sdp->bearer_services.count) { |
| OSMO_STRBUF_PRINTF(sb, ","); |
| OSMO_STRBUF_APPEND(sb, csd_bs_list_to_str_buf, &sdp->bearer_services); |
| } |
| OSMO_STRBUF_PRINTF(sb, "}"); |
| return sb.chars_needed; |
| } |
| |
| char *sdp_msg_to_str_c(void *ctx, const struct sdp_msg *sdp) |
| { |
| OSMO_NAME_C_IMPL(ctx, 128, "sdp_msg_to_str_c-ERROR", sdp_msg_to_str_buf, sdp) |
| } |
| |
| const char *sdp_msg_to_str(const struct sdp_msg *sdp) |
| { |
| return sdp_msg_to_str_c(OTC_SELECT, sdp); |
| } |
| |
| void sdp_audio_codecs_set_csd(struct sdp_audio_codecs *ac) |
| { |
| *ac = (struct sdp_audio_codecs){ |
| .count = 1, |
| .codec = {{ |
| .payload_type = 120, |
| .subtype_name = "CLEARMODE", |
| .rate = 8000, |
| }}, |
| }; |
| } |