diff options
Diffstat (limited to 'src/libmgcp/mgcp_sdp.c')
-rw-r--r-- | src/libmgcp/mgcp_sdp.c | 305 |
1 files changed, 0 insertions, 305 deletions
diff --git a/src/libmgcp/mgcp_sdp.c b/src/libmgcp/mgcp_sdp.c deleted file mode 100644 index b64894496..000000000 --- a/src/libmgcp/mgcp_sdp.c +++ /dev/null @@ -1,305 +0,0 @@ -/* - * Some SDP file parsing... - * - * (C) 2009-2015 by Holger Hans Peter Freyther <zecke@selfish.org> - * (C) 2009-2014 by On-Waves - * All Rights Reserved - * - * 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 <openbsc/mgcp.h> -#include <openbsc/mgcp_internal.h> - -#include <errno.h> - -struct sdp_rtp_map { - /* the type */ - int payload_type; - /* null, static or later dynamic codec name */ - char *codec_name; - /* A pointer to the original line for later parsing */ - char *map_line; - - int rate; - int channels; -}; - -int mgcp_set_audio_info(void *ctx, struct mgcp_rtp_codec *codec, - int payload_type, const char *audio_name) -{ - int rate = codec->rate; - int channels = codec->channels; - char audio_codec[64]; - - talloc_free(codec->subtype_name); - codec->subtype_name = NULL; - talloc_free(codec->audio_name); - codec->audio_name = NULL; - - if (payload_type != PTYPE_UNDEFINED) - codec->payload_type = payload_type; - - if (!audio_name) { - switch (payload_type) { - case 0: audio_name = "PCMU/8000/1"; break; - case 3: audio_name = "GSM/8000/1"; break; - case 8: audio_name = "PCMA/8000/1"; break; - case 18: audio_name = "G729/8000/1"; break; - default: - /* Payload type is unknown, don't change rate and - * channels. */ - /* TODO: return value? */ - return 0; - } - } - - if (sscanf(audio_name, "%63[^/]/%d/%d", - audio_codec, &rate, &channels) < 1) - return -EINVAL; - - codec->rate = rate; - codec->channels = channels; - codec->subtype_name = talloc_strdup(ctx, audio_codec); - codec->audio_name = talloc_strdup(ctx, audio_name); - - if (!strcmp(audio_codec, "G729")) { - codec->frame_duration_num = 10; - codec->frame_duration_den = 1000; - } else { - codec->frame_duration_num = DEFAULT_RTP_AUDIO_FRAME_DUR_NUM; - codec->frame_duration_den = DEFAULT_RTP_AUDIO_FRAME_DUR_DEN; - } - - if (payload_type < 0) { - payload_type = 96; - if (rate == 8000 && channels == 1) { - if (!strcmp(audio_codec, "GSM")) - payload_type = 3; - else if (!strcmp(audio_codec, "PCMA")) - payload_type = 8; - else if (!strcmp(audio_codec, "PCMU")) - payload_type = 0; - else if (!strcmp(audio_codec, "G729")) - payload_type = 18; - } - - codec->payload_type = payload_type; - } - - if (channels != 1) - LOGP(DMGCP, LOGL_NOTICE, - "Channels != 1 in SDP: '%s'\n", audio_name); - - return 0; -} - -void codecs_initialize(void *ctx, struct sdp_rtp_map *codecs, int used) -{ - int i; - - for (i = 0; i < used; ++i) { - switch (codecs[i].payload_type) { - case 0: - codecs[i].codec_name = "PCMU"; - codecs[i].rate = 8000; - codecs[i].channels = 1; - break; - case 3: - codecs[i].codec_name = "GSM"; - codecs[i].rate = 8000; - codecs[i].channels = 1; - break; - case 8: - codecs[i].codec_name = "PCMA"; - codecs[i].rate = 8000; - codecs[i].channels = 1; - break; - case 18: - codecs[i].codec_name = "G729"; - codecs[i].rate = 8000; - codecs[i].channels = 1; - break; - } - } -} - -void codecs_update(void *ctx, struct sdp_rtp_map *codecs, int used, int payload, char *audio_name) -{ - int i; - - for (i = 0; i < used; ++i) { - char audio_codec[64]; - int rate = -1; - int channels = -1; - if (codecs[i].payload_type != payload) - continue; - if (sscanf(audio_name, "%63[^/]/%d/%d", - audio_codec, &rate, &channels) < 1) { - LOGP(DMGCP, LOGL_ERROR, "Failed to parse '%s'\n", audio_name); - continue; - } - - codecs[i].map_line = talloc_strdup(ctx, audio_name); - codecs[i].codec_name = talloc_strdup(ctx, audio_codec); - codecs[i].rate = rate; - codecs[i].channels = channels; - return; - } - - LOGP(DMGCP, LOGL_ERROR, "Unconfigured PT(%d) with %s\n", payload, audio_name); -} - -int is_codec_compatible(struct mgcp_endpoint *endp, struct sdp_rtp_map *codec) -{ - char *bts_codec; - char audio_codec[64]; - - if (!codec->codec_name) - return 0; - - /* - * GSM, GSM/8000 and GSM/8000/1 should all be compatible.. let's go - * by name first. - */ - bts_codec = endp->tcfg->audio_name; - if (sscanf(bts_codec, "%63[^/]/%*d/%*d", audio_codec) < 1) - return 0; - - return strcasecmp(audio_codec, codec->codec_name) == 0; -} - -int mgcp_parse_sdp_data(struct mgcp_endpoint *endp, struct mgcp_rtp_end *rtp, struct mgcp_parse_data *p) -{ - struct sdp_rtp_map codecs[10]; - int codecs_used = 0; - char *line; - int maxptime = -1; - int i; - int codecs_assigned = 0; - void *tmp_ctx = talloc_new(NULL); - - memset(&codecs, 0, sizeof(codecs)); - - for_each_line(line, p->save) { - switch (line[0]) { - case 'o': - case 's': - case 't': - case 'v': - /* skip these SDP attributes */ - break; - case 'a': { - int payload; - int ptime, ptime2 = 0; - char audio_name[64]; - - - if (sscanf(line, "a=rtpmap:%d %63s", - &payload, audio_name) == 2) { - codecs_update(tmp_ctx, codecs, codecs_used, payload, audio_name); - } else if (sscanf(line, "a=ptime:%d-%d", - &ptime, &ptime2) >= 1) { - if (ptime2 > 0 && ptime2 != ptime) - rtp->packet_duration_ms = 0; - else - rtp->packet_duration_ms = ptime; - } else if (sscanf(line, "a=maxptime:%d", &ptime2) == 1) { - maxptime = ptime2; - } - break; - } - case 'm': { - int port, rc; - - rc = sscanf(line, "m=audio %d RTP/AVP %d %d %d %d %d %d %d %d %d %d", - &port, - &codecs[0].payload_type, - &codecs[1].payload_type, - &codecs[2].payload_type, - &codecs[3].payload_type, - &codecs[4].payload_type, - &codecs[5].payload_type, - &codecs[6].payload_type, - &codecs[7].payload_type, - &codecs[8].payload_type, - &codecs[9].payload_type); - if (rc >= 2) { - rtp->rtp_port = htons(port); - rtp->rtcp_port = htons(port + 1); - codecs_used = rc - 1; - codecs_initialize(tmp_ctx, codecs, codecs_used); - } - break; - } - case 'c': { - char ipv4[16]; - - if (sscanf(line, "c=IN IP4 %15s", ipv4) == 1) { - inet_aton(ipv4, &rtp->addr); - } - break; - } - default: - if (p->endp) - LOGP(DMGCP, LOGL_NOTICE, - "Unhandled SDP option: '%c'/%d on 0x%x\n", - line[0], line[0], ENDPOINT_NUMBER(p->endp)); - else - LOGP(DMGCP, LOGL_NOTICE, - "Unhandled SDP option: '%c'/%d\n", - line[0], line[0]); - break; - } - } - - /* Now select the primary and alt_codec */ - for (i = 0; i < codecs_used && codecs_assigned < 2; ++i) { - struct mgcp_rtp_codec *codec = codecs_assigned == 0 ? - &rtp->codec : &rtp->alt_codec; - - if (endp->tcfg->no_audio_transcoding && - !is_codec_compatible(endp, &codecs[i])) { - LOGP(DMGCP, LOGL_NOTICE, "Skipping codec %s\n", - codecs[i].codec_name); - continue; - } - - mgcp_set_audio_info(p->cfg, codec, - codecs[i].payload_type, - codecs[i].map_line); - codecs_assigned += 1; - } - - if (codecs_assigned > 0) { - /* TODO/XXX: Store this per codec and derive it on use */ - if (maxptime >= 0 && maxptime * rtp->codec.frame_duration_den > - rtp->codec.frame_duration_num * 1500) { - /* more than 1 frame */ - rtp->packet_duration_ms = 0; - } - - LOGP(DMGCP, LOGL_NOTICE, - "Got media info via SDP: port %d, payload %d (%s), " - "duration %d, addr %s\n", - ntohs(rtp->rtp_port), rtp->codec.payload_type, - rtp->codec.subtype_name ? rtp->codec.subtype_name : "unknown", - rtp->packet_duration_ms, inet_ntoa(rtp->addr)); - } - - talloc_free(tmp_ctx); - return codecs_assigned > 0; -} - |