| /* $Id$ */ |
| /* |
| * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #include <pjmedia/stream.h> |
| #include <pjmedia/stream_common.h> |
| #include <pj/ctype.h> |
| #include <pj/rand.h> |
| |
| static const pj_str_t ID_AUDIO = { "audio", 5}; |
| static const pj_str_t ID_IN = { "IN", 2 }; |
| static const pj_str_t ID_IP4 = { "IP4", 3}; |
| static const pj_str_t ID_IP6 = { "IP6", 3}; |
| static const pj_str_t ID_RTP_AVP = { "RTP/AVP", 7 }; |
| static const pj_str_t ID_RTP_SAVP = { "RTP/SAVP", 8 }; |
| //static const pj_str_t ID_SDP_NAME = { "pjmedia", 7 }; |
| static const pj_str_t ID_RTPMAP = { "rtpmap", 6 }; |
| static const pj_str_t ID_TELEPHONE_EVENT = { "telephone-event", 15 }; |
| |
| static const pj_str_t STR_INACTIVE = { "inactive", 8 }; |
| static const pj_str_t STR_SENDRECV = { "sendrecv", 8 }; |
| static const pj_str_t STR_SENDONLY = { "sendonly", 8 }; |
| static const pj_str_t STR_RECVONLY = { "recvonly", 8 }; |
| |
| |
| /* |
| * Internal function for collecting codec info and param from the SDP media. |
| */ |
| static pj_status_t get_audio_codec_info_param(pjmedia_stream_info *si, |
| pj_pool_t *pool, |
| pjmedia_codec_mgr *mgr, |
| const pjmedia_sdp_media *local_m, |
| const pjmedia_sdp_media *rem_m) |
| { |
| const pjmedia_sdp_attr *attr; |
| pjmedia_sdp_rtpmap *rtpmap; |
| unsigned i, fmti, pt = 0; |
| pj_status_t status; |
| |
| /* Find the first codec which is not telephone-event */ |
| for ( fmti = 0; fmti < local_m->desc.fmt_count; ++fmti ) { |
| pjmedia_sdp_rtpmap r; |
| |
| if ( !pj_isdigit(*local_m->desc.fmt[fmti].ptr) ) |
| return PJMEDIA_EINVALIDPT; |
| pt = pj_strtoul(&local_m->desc.fmt[fmti]); |
| |
| if (pt < 96) { |
| /* This is known static PT. Skip rtpmap checking because it is |
| * optional. */ |
| break; |
| } |
| |
| attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP, |
| &local_m->desc.fmt[fmti]); |
| if (attr == NULL) |
| continue; |
| |
| status = pjmedia_sdp_attr_get_rtpmap(attr, &r); |
| if (status != PJ_SUCCESS) |
| continue; |
| |
| if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) != 0) |
| break; |
| } |
| if ( fmti >= local_m->desc.fmt_count ) |
| return PJMEDIA_EINVALIDPT; |
| |
| /* Get payload type for receiving direction */ |
| si->rx_pt = pt; |
| |
| /* Get codec info. |
| * For static payload types, get the info from codec manager. |
| * For dynamic payload types, MUST get the rtpmap. |
| */ |
| if (pt < 96) { |
| pj_bool_t has_rtpmap; |
| |
| rtpmap = NULL; |
| has_rtpmap = PJ_TRUE; |
| |
| attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP, |
| &local_m->desc.fmt[fmti]); |
| if (attr == NULL) { |
| has_rtpmap = PJ_FALSE; |
| } |
| if (attr != NULL) { |
| status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap); |
| if (status != PJ_SUCCESS) |
| has_rtpmap = PJ_FALSE; |
| } |
| |
| /* Build codec format info: */ |
| if (has_rtpmap) { |
| si->fmt.type = si->type; |
| si->fmt.pt = pj_strtoul(&local_m->desc.fmt[fmti]); |
| pj_strdup(pool, &si->fmt.encoding_name, &rtpmap->enc_name); |
| si->fmt.clock_rate = rtpmap->clock_rate; |
| |
| #if defined(PJMEDIA_HANDLE_G722_MPEG_BUG) && (PJMEDIA_HANDLE_G722_MPEG_BUG != 0) |
| /* The session info should have the actual clock rate, because |
| * this info is used for calculationg buffer size, etc in stream |
| */ |
| if (si->fmt.pt == PJMEDIA_RTP_PT_G722) |
| si->fmt.clock_rate = 16000; |
| #endif |
| |
| /* For audio codecs, rtpmap parameters denotes the number of |
| * channels. |
| */ |
| if (si->type == PJMEDIA_TYPE_AUDIO && rtpmap->param.slen) { |
| si->fmt.channel_cnt = (unsigned) pj_strtoul(&rtpmap->param); |
| } else { |
| si->fmt.channel_cnt = 1; |
| } |
| |
| } else { |
| const pjmedia_codec_info *p_info; |
| |
| status = pjmedia_codec_mgr_get_codec_info( mgr, pt, &p_info); |
| if (status != PJ_SUCCESS) |
| return status; |
| |
| pj_memcpy(&si->fmt, p_info, sizeof(pjmedia_codec_info)); |
| } |
| |
| /* For static payload type, pt's are symetric */ |
| si->tx_pt = pt; |
| |
| } else { |
| pjmedia_codec_id codec_id; |
| pj_str_t codec_id_st; |
| const pjmedia_codec_info *p_info; |
| |
| attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP, |
| &local_m->desc.fmt[fmti]); |
| if (attr == NULL) |
| return PJMEDIA_EMISSINGRTPMAP; |
| |
| status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap); |
| if (status != PJ_SUCCESS) |
| return status; |
| |
| /* Build codec format info: */ |
| |
| si->fmt.type = si->type; |
| si->fmt.pt = pj_strtoul(&local_m->desc.fmt[fmti]); |
| si->fmt.encoding_name = rtpmap->enc_name; |
| si->fmt.clock_rate = rtpmap->clock_rate; |
| |
| /* For audio codecs, rtpmap parameters denotes the number of |
| * channels. |
| */ |
| if (si->type == PJMEDIA_TYPE_AUDIO && rtpmap->param.slen) { |
| si->fmt.channel_cnt = (unsigned) pj_strtoul(&rtpmap->param); |
| } else { |
| si->fmt.channel_cnt = 1; |
| } |
| |
| /* Normalize the codec info from codec manager. Note that the |
| * payload type will be resetted to its default (it might have |
| * been rewritten by the SDP negotiator to match to the remote |
| * offer), this is intentional as currently some components may |
| * prefer (or even require) the default PT in codec info. |
| */ |
| pjmedia_codec_info_to_id(&si->fmt, codec_id, sizeof(codec_id)); |
| |
| i = 1; |
| codec_id_st = pj_str(codec_id); |
| status = pjmedia_codec_mgr_find_codecs_by_id(mgr, &codec_id_st, |
| &i, &p_info, NULL); |
| if (status != PJ_SUCCESS) |
| return status; |
| |
| pj_memcpy(&si->fmt, p_info, sizeof(pjmedia_codec_info)); |
| |
| /* Determine payload type for outgoing channel, by finding |
| * dynamic payload type in remote SDP that matches the answer. |
| */ |
| si->tx_pt = 0xFFFF; |
| for (i=0; i<rem_m->desc.fmt_count; ++i) { |
| unsigned rpt; |
| pjmedia_sdp_attr *r_attr; |
| pjmedia_sdp_rtpmap r_rtpmap; |
| |
| rpt = pj_strtoul(&rem_m->desc.fmt[i]); |
| if (rpt < 96) |
| continue; |
| |
| r_attr = pjmedia_sdp_media_find_attr(rem_m, &ID_RTPMAP, |
| &rem_m->desc.fmt[i]); |
| if (!r_attr) |
| continue; |
| |
| if (pjmedia_sdp_attr_get_rtpmap(r_attr, &r_rtpmap) != PJ_SUCCESS) |
| continue; |
| |
| if (!pj_stricmp(&rtpmap->enc_name, &r_rtpmap.enc_name) && |
| rtpmap->clock_rate == r_rtpmap.clock_rate) |
| { |
| /* Found matched codec. */ |
| si->tx_pt = rpt; |
| |
| break; |
| } |
| } |
| |
| if (si->tx_pt == 0xFFFF) |
| return PJMEDIA_EMISSINGRTPMAP; |
| } |
| |
| |
| /* Now that we have codec info, get the codec param. */ |
| si->param = PJ_POOL_ALLOC_T(pool, pjmedia_codec_param); |
| status = pjmedia_codec_mgr_get_default_param(mgr, &si->fmt, |
| si->param); |
| |
| /* Get remote fmtp for our encoder. */ |
| pjmedia_stream_info_parse_fmtp(pool, rem_m, si->tx_pt, |
| &si->param->setting.enc_fmtp); |
| |
| /* Get local fmtp for our decoder. */ |
| pjmedia_stream_info_parse_fmtp(pool, local_m, si->rx_pt, |
| &si->param->setting.dec_fmtp); |
| |
| /* Get the remote ptime for our encoder. */ |
| attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr, |
| "ptime", NULL); |
| if (attr) { |
| pj_str_t tmp_val = attr->value; |
| unsigned frm_per_pkt; |
| |
| pj_strltrim(&tmp_val); |
| |
| /* Round up ptime when the specified is not multiple of frm_ptime */ |
| frm_per_pkt = (pj_strtoul(&tmp_val) + |
| si->param->info.frm_ptime/2) / |
| si->param->info.frm_ptime; |
| if (frm_per_pkt != 0) { |
| si->param->setting.frm_per_pkt = (pj_uint8_t)frm_per_pkt; |
| } |
| } |
| |
| /* Get remote maxptime for our encoder. */ |
| attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr, |
| "maxptime", NULL); |
| if (attr) { |
| pj_str_t tmp_val = attr->value; |
| |
| pj_strltrim(&tmp_val); |
| si->tx_maxptime = pj_strtoul(&tmp_val); |
| } |
| |
| /* When direction is NONE (it means SDP negotiation has failed) we don't |
| * need to return a failure here, as returning failure will cause |
| * the whole SDP to be rejected. See ticket #: |
| * http:// |
| * |
| * Thanks Alain Totouom |
| */ |
| if (status != PJ_SUCCESS && si->dir != PJMEDIA_DIR_NONE) |
| return status; |
| |
| |
| /* Get incomming payload type for telephone-events */ |
| si->rx_event_pt = -1; |
| for (i=0; i<local_m->attr_count; ++i) { |
| pjmedia_sdp_rtpmap r; |
| |
| attr = local_m->attr[i]; |
| if (pj_strcmp(&attr->name, &ID_RTPMAP) != 0) |
| continue; |
| if (pjmedia_sdp_attr_get_rtpmap(attr, &r) != PJ_SUCCESS) |
| continue; |
| if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) == 0) { |
| si->rx_event_pt = pj_strtoul(&r.pt); |
| break; |
| } |
| } |
| |
| /* Get outgoing payload type for telephone-events */ |
| si->tx_event_pt = -1; |
| for (i=0; i<rem_m->attr_count; ++i) { |
| pjmedia_sdp_rtpmap r; |
| |
| attr = rem_m->attr[i]; |
| if (pj_strcmp(&attr->name, &ID_RTPMAP) != 0) |
| continue; |
| if (pjmedia_sdp_attr_get_rtpmap(attr, &r) != PJ_SUCCESS) |
| continue; |
| if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) == 0) { |
| si->tx_event_pt = pj_strtoul(&r.pt); |
| break; |
| } |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| |
| /* |
| * Create stream info from SDP media line. |
| */ |
| PJ_DEF(pj_status_t) pjmedia_stream_info_from_sdp( |
| pjmedia_stream_info *si, |
| pj_pool_t *pool, |
| pjmedia_endpt *endpt, |
| const pjmedia_sdp_session *local, |
| const pjmedia_sdp_session *remote, |
| unsigned stream_idx) |
| { |
| pjmedia_codec_mgr *mgr; |
| const pjmedia_sdp_attr *attr; |
| const pjmedia_sdp_media *local_m; |
| const pjmedia_sdp_media *rem_m; |
| const pjmedia_sdp_conn *local_conn; |
| const pjmedia_sdp_conn *rem_conn; |
| int rem_af, local_af; |
| pj_sockaddr local_addr; |
| pj_status_t status; |
| |
| |
| /* Validate arguments: */ |
| PJ_ASSERT_RETURN(pool && si && local && remote, PJ_EINVAL); |
| PJ_ASSERT_RETURN(stream_idx < local->media_count, PJ_EINVAL); |
| PJ_ASSERT_RETURN(stream_idx < remote->media_count, PJ_EINVAL); |
| |
| /* Keep SDP shortcuts */ |
| local_m = local->media[stream_idx]; |
| rem_m = remote->media[stream_idx]; |
| |
| local_conn = local_m->conn ? local_m->conn : local->conn; |
| if (local_conn == NULL) |
| return PJMEDIA_SDP_EMISSINGCONN; |
| |
| rem_conn = rem_m->conn ? rem_m->conn : remote->conn; |
| if (rem_conn == NULL) |
| return PJMEDIA_SDP_EMISSINGCONN; |
| |
| /* Media type must be audio */ |
| if (pj_stricmp(&local_m->desc.media, &ID_AUDIO) != 0) |
| return PJMEDIA_EINVALIMEDIATYPE; |
| |
| /* Get codec manager. */ |
| mgr = pjmedia_endpt_get_codec_mgr(endpt); |
| |
| /* Reset: */ |
| |
| pj_bzero(si, sizeof(*si)); |
| |
| #if PJMEDIA_HAS_RTCP_XR && PJMEDIA_STREAM_ENABLE_XR |
| /* Set default RTCP XR enabled/disabled */ |
| si->rtcp_xr_enabled = PJ_TRUE; |
| #endif |
| |
| /* Media type: */ |
| si->type = PJMEDIA_TYPE_AUDIO; |
| |
| /* Transport protocol */ |
| |
| /* At this point, transport type must be compatible, |
| * the transport instance will do more validation later. |
| */ |
| status = pjmedia_sdp_transport_cmp(&rem_m->desc.transport, |
| &local_m->desc.transport); |
| if (status != PJ_SUCCESS) |
| return PJMEDIA_SDPNEG_EINVANSTP; |
| |
| if (pj_stricmp(&local_m->desc.transport, &ID_RTP_AVP) == 0) { |
| |
| si->proto = PJMEDIA_TP_PROTO_RTP_AVP; |
| |
| } else if (pj_stricmp(&local_m->desc.transport, &ID_RTP_SAVP) == 0) { |
| |
| si->proto = PJMEDIA_TP_PROTO_RTP_SAVP; |
| |
| } else { |
| |
| si->proto = PJMEDIA_TP_PROTO_UNKNOWN; |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* Check address family in remote SDP */ |
| rem_af = pj_AF_UNSPEC(); |
| if (pj_stricmp(&rem_conn->net_type, &ID_IN)==0) { |
| if (pj_stricmp(&rem_conn->addr_type, &ID_IP4)==0) { |
| rem_af = pj_AF_INET(); |
| } else if (pj_stricmp(&rem_conn->addr_type, &ID_IP6)==0) { |
| rem_af = pj_AF_INET6(); |
| } |
| } |
| |
| if (rem_af==pj_AF_UNSPEC()) { |
| /* Unsupported address family */ |
| return PJ_EAFNOTSUP; |
| } |
| |
| /* Set remote address: */ |
| status = pj_sockaddr_init(rem_af, &si->rem_addr, &rem_conn->addr, |
| rem_m->desc.port); |
| if (status != PJ_SUCCESS) { |
| /* Invalid IP address. */ |
| return PJMEDIA_EINVALIDIP; |
| } |
| |
| /* Check address family of local info */ |
| local_af = pj_AF_UNSPEC(); |
| if (pj_stricmp(&local_conn->net_type, &ID_IN)==0) { |
| if (pj_stricmp(&local_conn->addr_type, &ID_IP4)==0) { |
| local_af = pj_AF_INET(); |
| } else if (pj_stricmp(&local_conn->addr_type, &ID_IP6)==0) { |
| local_af = pj_AF_INET6(); |
| } |
| } |
| |
| if (local_af==pj_AF_UNSPEC()) { |
| /* Unsupported address family */ |
| return PJ_SUCCESS; |
| } |
| |
| /* Set remote address: */ |
| status = pj_sockaddr_init(local_af, &local_addr, &local_conn->addr, |
| local_m->desc.port); |
| if (status != PJ_SUCCESS) { |
| /* Invalid IP address. */ |
| return PJMEDIA_EINVALIDIP; |
| } |
| |
| /* Local and remote address family must match */ |
| if (local_af != rem_af) |
| return PJ_EAFNOTSUP; |
| |
| /* Media direction: */ |
| |
| if (local_m->desc.port == 0 || |
| pj_sockaddr_has_addr(&local_addr)==PJ_FALSE || |
| pj_sockaddr_has_addr(&si->rem_addr)==PJ_FALSE || |
| pjmedia_sdp_media_find_attr(local_m, &STR_INACTIVE, NULL)!=NULL) |
| { |
| /* Inactive stream. */ |
| |
| si->dir = PJMEDIA_DIR_NONE; |
| |
| } else if (pjmedia_sdp_media_find_attr(local_m, &STR_SENDONLY, NULL)!=NULL) { |
| |
| /* Send only stream. */ |
| |
| si->dir = PJMEDIA_DIR_ENCODING; |
| |
| } else if (pjmedia_sdp_media_find_attr(local_m, &STR_RECVONLY, NULL)!=NULL) { |
| |
| /* Recv only stream. */ |
| |
| si->dir = PJMEDIA_DIR_DECODING; |
| |
| } else { |
| |
| /* Send and receive stream. */ |
| |
| si->dir = PJMEDIA_DIR_ENCODING_DECODING; |
| |
| } |
| |
| /* No need to do anything else if stream is rejected */ |
| if (local_m->desc.port == 0) { |
| return PJ_SUCCESS; |
| } |
| |
| /* If "rtcp" attribute is present in the SDP, set the RTCP address |
| * from that attribute. Otherwise, calculate from RTP address. |
| */ |
| attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr, |
| "rtcp", NULL); |
| if (attr) { |
| pjmedia_sdp_rtcp_attr rtcp; |
| status = pjmedia_sdp_attr_get_rtcp(attr, &rtcp); |
| if (status == PJ_SUCCESS) { |
| if (rtcp.addr.slen) { |
| status = pj_sockaddr_init(rem_af, &si->rem_rtcp, &rtcp.addr, |
| (pj_uint16_t)rtcp.port); |
| } else { |
| pj_sockaddr_init(rem_af, &si->rem_rtcp, NULL, |
| (pj_uint16_t)rtcp.port); |
| pj_memcpy(pj_sockaddr_get_addr(&si->rem_rtcp), |
| pj_sockaddr_get_addr(&si->rem_addr), |
| pj_sockaddr_get_addr_len(&si->rem_addr)); |
| } |
| } |
| } |
| |
| if (!pj_sockaddr_has_addr(&si->rem_rtcp)) { |
| int rtcp_port; |
| |
| pj_memcpy(&si->rem_rtcp, &si->rem_addr, sizeof(pj_sockaddr)); |
| rtcp_port = pj_sockaddr_get_port(&si->rem_addr) + 1; |
| pj_sockaddr_set_port(&si->rem_rtcp, (pj_uint16_t)rtcp_port); |
| } |
| |
| |
| /* Get the payload number for receive channel. */ |
| /* |
| Previously we used to rely on fmt[0] being the selected codec, |
| but some UA sends telephone-event as fmt[0] and this would |
| cause assert failure below. |
| |
| Thanks Chris Hamilton <chamilton .at. cs.dal.ca> for this patch. |
| |
| // And codec must be numeric! |
| if (!pj_isdigit(*local_m->desc.fmt[0].ptr) || |
| !pj_isdigit(*rem_m->desc.fmt[0].ptr)) |
| { |
| return PJMEDIA_EINVALIDPT; |
| } |
| |
| pt = pj_strtoul(&local_m->desc.fmt[0]); |
| pj_assert(PJMEDIA_RTP_PT_TELEPHONE_EVENTS==0 || |
| pt != PJMEDIA_RTP_PT_TELEPHONE_EVENTS); |
| */ |
| |
| /* Get codec info and param */ |
| status = get_audio_codec_info_param(si, pool, mgr, local_m, rem_m); |
| |
| /* Leave SSRC to random. */ |
| si->ssrc = pj_rand(); |
| |
| /* Set default jitter buffer parameter. */ |
| si->jb_init = si->jb_max = si->jb_min_pre = si->jb_max_pre = -1; |
| |
| return status; |
| } |
| |