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99 lines
3.3 KiB
99 lines
3.3 KiB
/*
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* Copyright (C) 2010 Stefan Sayer
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*
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* This file is part of SEMS, a free SIP media server.
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*
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* SEMS is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* For a license to use the SEMS software under conditions
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* other than those described here, or to purchase support for this
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* software, please contact iptel.org by e-mail at the following addresses:
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* info@iptel.org
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*
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* SEMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "SDPFilter.h"
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#include <algorithm>
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#include "log.h"
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#include "AmUtils.h"
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#include "RTPParameters.h"
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int filterSDP(AmSdp& sdp, FilterType sdpfilter, const std::set<string>& sdpfilter_list) {
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if (sdpfilter == Transparent)
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return 0;
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for (std::vector<SdpMedia>::iterator m_it =
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sdp.media.begin(); m_it != sdp.media.end(); m_it++) {
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SdpMedia& media = *m_it;
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std::vector<SdpPayload> new_pl;
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for (std::vector<SdpPayload>::iterator p_it =
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media.payloads.begin(); p_it != media.payloads.end(); p_it++) {
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string c = p_it->encoding_name;
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std::transform(c.begin(), c.end(), c.begin(), ::tolower);
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bool is_filtered = (sdpfilter == Whitelist) ^
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(sdpfilter_list.find(c) != sdpfilter_list.end());
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// DBG("%s (%s) is_filtered: %s\n", p_it->encoding_name.c_str(), c.c_str(),
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// is_filtered?"true":"false");
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if (!is_filtered)
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new_pl.push_back(*p_it);
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}
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// todo: what if no payload supported any more?
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media.payloads = new_pl;
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}
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return 0;
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}
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void fix_missing_encodings(SdpMedia& m) {
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for (std::vector<SdpPayload>::iterator p_it=
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m.payloads.begin(); p_it!=m.payloads.end(); p_it++) {
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SdpPayload& p = *p_it;
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if (!p.encoding_name.empty())
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continue;
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if (p.payload_type > (IANA_RTP_PAYLOADS_SIZE-1) || p.payload_type < 0)
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continue; // todo: throw out this payload
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if (IANA_RTP_PAYLOADS[p.payload_type].payload_name[0]=='\0')
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continue; // todo: throw out this payload
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p.encoding_name = IANA_RTP_PAYLOADS[p.payload_type].payload_name;
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p.clock_rate = IANA_RTP_PAYLOADS[p.payload_type].clock_rate;
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if (IANA_RTP_PAYLOADS[p.payload_type].channels > 1)
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p.encoding_param = IANA_RTP_PAYLOADS[p.payload_type].channels;
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DBG("named SDP payload type %d with %s/%d%s\n",
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p.payload_type, IANA_RTP_PAYLOADS[p.payload_type].payload_name,
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IANA_RTP_PAYLOADS[p.payload_type].clock_rate,
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IANA_RTP_PAYLOADS[p.payload_type].channels > 1 ?
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("/"+int2str(IANA_RTP_PAYLOADS[p.payload_type].channels)).c_str() : "");
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}
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}
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int normalizeSDP(AmSdp& sdp) {
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for (std::vector<SdpMedia>::iterator m_it=
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sdp.media.begin(); m_it != sdp.media.end(); m_it++) {
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if (m_it->type != MT_AUDIO && m_it->type != MT_VIDEO)
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continue;
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// fill missing encoding names (a= lines)
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fix_missing_encodings(*m_it);
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}
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return 0;
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}
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