diff options
Diffstat (limited to 'pjmedia/src/pjmedia/stream_info.c')
-rw-r--r-- | pjmedia/src/pjmedia/stream_info.c | 548 |
1 files changed, 548 insertions, 0 deletions
diff --git a/pjmedia/src/pjmedia/stream_info.c b/pjmedia/src/pjmedia/stream_info.c new file mode 100644 index 0000000..5d336e5 --- /dev/null +++ b/pjmedia/src/pjmedia/stream_info.c @@ -0,0 +1,548 @@ +/* $Id: stream_info.c 3982 2012-03-22 09:56:52Z bennylp $ */ +/* + * 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; +} + |