| /* $Id$ */ |
| /* |
| * Copyright (C) 2011 Teluu Inc. (http://www.teluu.com) |
| * |
| * 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/vid_stream.h> |
| #include <pjmedia/sdp_neg.h> |
| #include <pjmedia/stream_common.h> |
| #include <pj/ctype.h> |
| #include <pj/rand.h> |
| |
| #if defined(PJMEDIA_HAS_VIDEO) && (PJMEDIA_HAS_VIDEO != 0) |
| |
| static const pj_str_t ID_VIDEO = { "video", 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 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_video_codec_info_param(pjmedia_vid_stream_info *si, |
| pj_pool_t *pool, |
| pjmedia_vid_codec_mgr *mgr, |
| const pjmedia_sdp_media *local_m, |
| const pjmedia_sdp_media *rem_m) |
| { |
| unsigned pt = 0; |
| const pjmedia_vid_codec_info *p_info; |
| pj_status_t status; |
| |
| pt = pj_strtoul(&local_m->desc.fmt[0]); |
| |
| /* Get payload type for receiving direction */ |
| si->rx_pt = pt; |
| |
| /* Get codec info and payload type for transmitting direction. */ |
| if (pt < 96) { |
| /* For static payload types, get the codec info from codec manager. */ |
| status = pjmedia_vid_codec_mgr_get_codec_info(mgr, pt, &p_info); |
| if (status != PJ_SUCCESS) |
| return status; |
| |
| si->codec_info = *p_info; |
| |
| /* Get payload type for transmitting direction. |
| * For static payload type, pt's are symetric. |
| */ |
| si->tx_pt = pt; |
| } else { |
| const pjmedia_sdp_attr *attr; |
| pjmedia_sdp_rtpmap *rtpmap; |
| pjmedia_codec_id codec_id; |
| pj_str_t codec_id_st; |
| unsigned i; |
| |
| /* 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) { |
| if (pjmedia_sdp_neg_fmt_match(NULL, |
| (pjmedia_sdp_media*)local_m, 0, |
| (pjmedia_sdp_media*)rem_m, i, 0) == |
| PJ_SUCCESS) |
| { |
| /* Found matched codec. */ |
| si->tx_pt = pj_strtoul(&rem_m->desc.fmt[i]); |
| break; |
| } |
| } |
| |
| if (si->tx_pt == 0xFFFF) |
| return PJMEDIA_EMISSINGRTPMAP; |
| |
| /* For dynamic payload types, get codec name from the rtpmap */ |
| attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP, |
| &local_m->desc.fmt[0]); |
| if (attr == NULL) |
| return PJMEDIA_EMISSINGRTPMAP; |
| |
| status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap); |
| if (status != PJ_SUCCESS) |
| return status; |
| |
| /* Then get the codec info from the codec manager */ |
| pj_ansi_snprintf(codec_id, sizeof(codec_id), "%.*s/", |
| (int)rtpmap->enc_name.slen, rtpmap->enc_name.ptr); |
| codec_id_st = pj_str(codec_id); |
| i = 1; |
| status = pjmedia_vid_codec_mgr_find_codecs_by_id(mgr, &codec_id_st, |
| &i, &p_info, NULL); |
| if (status != PJ_SUCCESS) |
| return status; |
| |
| si->codec_info = *p_info; |
| } |
| |
| |
| /* Request for codec with the correct packing for streaming */ |
| si->codec_info.packings = PJMEDIA_VID_PACKING_PACKETS; |
| |
| /* Now that we have codec info, get the codec param. */ |
| si->codec_param = PJ_POOL_ALLOC_T(pool, pjmedia_vid_codec_param); |
| status = pjmedia_vid_codec_mgr_get_default_param(mgr, |
| &si->codec_info, |
| si->codec_param); |
| |
| /* Adjust encoding bitrate, if higher than remote preference. The remote |
| * bitrate preference is read from SDP "b=TIAS" line in media level. |
| */ |
| if ((si->dir & PJMEDIA_DIR_ENCODING) && rem_m->bandw_count) { |
| unsigned i, bandw = 0; |
| |
| for (i = 0; i < rem_m->bandw_count; ++i) { |
| const pj_str_t STR_BANDW_MODIFIER_TIAS = { "TIAS", 4 }; |
| if (!pj_stricmp(&rem_m->bandw[i]->modifier, |
| &STR_BANDW_MODIFIER_TIAS)) |
| { |
| bandw = rem_m->bandw[i]->value; |
| break; |
| } |
| } |
| |
| if (bandw) { |
| pjmedia_video_format_detail *enc_vfd; |
| enc_vfd = pjmedia_format_get_video_format_detail( |
| &si->codec_param->enc_fmt, PJ_TRUE); |
| if (!enc_vfd->avg_bps || enc_vfd->avg_bps > bandw) |
| enc_vfd->avg_bps = bandw * 3 / 4; |
| if (!enc_vfd->max_bps || enc_vfd->max_bps > bandw) |
| enc_vfd->max_bps = bandw; |
| } |
| } |
| |
| /* Get remote fmtp for our encoder. */ |
| pjmedia_stream_info_parse_fmtp(pool, rem_m, si->tx_pt, |
| &si->codec_param->enc_fmtp); |
| |
| /* Get local fmtp for our decoder. */ |
| pjmedia_stream_info_parse_fmtp(pool, local_m, si->rx_pt, |
| &si->codec_param->dec_fmtp); |
| |
| /* 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; |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| |
| /* |
| * Create stream info from SDP media line. |
| */ |
| PJ_DEF(pj_status_t) pjmedia_vid_stream_info_from_sdp( |
| pjmedia_vid_stream_info *si, |
| pj_pool_t *pool, |
| pjmedia_endpt *endpt, |
| const pjmedia_sdp_session *local, |
| const pjmedia_sdp_session *remote, |
| unsigned stream_idx) |
| { |
| 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; |
| |
| PJ_UNUSED_ARG(endpt); |
| |
| /* 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 video */ |
| if (pj_stricmp(&local_m->desc.media, &ID_VIDEO) != 0) |
| return PJMEDIA_EINVALIMEDIATYPE; |
| |
| |
| /* Reset: */ |
| |
| pj_bzero(si, sizeof(*si)); |
| |
| /* Media type: */ |
| si->type = PJMEDIA_TYPE_VIDEO; |
| |
| /* 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 codec info and param */ |
| status = get_video_codec_info_param(si, pool, NULL, 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; |
| } |
| |
| #endif /* PJMEDIA_HAS_VIDEO */ |