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1541 lines
37 KiB
1541 lines
37 KiB
/*
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*parse or be parsed
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "AmConfig.h"
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#include "AmSdp.h"
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#include "AmUtils.h"
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#include "AmPlugIn.h"
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#include "AmSession.h"
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#include "amci/amci.h"
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#include "log.h"
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#include <stdexcept>
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#include <string>
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#include <map>
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using std::string;
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using std::map;
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#include <cctype>
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#include <algorithm>
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// Not on Solaris!
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#if !defined (__SVR4) && !defined (__sun)
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#include "strings.h"
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#endif
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#define CR '\r'
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#define LF '\n'
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#define CRLF "\r\n"
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static void parse_session_attr(AmSdp* sdp_msg, char* s, char** next);
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static bool parse_sdp_line_ex(AmSdp* sdp_msg, char*& s);
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static char* parse_sdp_connection(AmSdp* sdp_msg, char* s, char t);
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static void parse_sdp_media(AmSdp* sdp_msg, char* s);
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static char* parse_sdp_attr(AmSdp* sdp_msg, char* s);
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static void parse_sdp_origin(AmSdp* sdp_masg, char* s);
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inline char* get_next_line(char* s);
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inline char* skip_till_next_line(char* s, size_t& line_len);
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static char* is_eql_next(char* s);
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static char* parse_until(char* s, char end);
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static char* parse_until(char* s, char* end, char c);
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static bool contains(char* s, char* next_line, char c);
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static bool is_wsp(char s);
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static MediaType media_type(std::string media);
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static TransProt transport_type(std::string transport);
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static bool attr_check(std::string attr);
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enum parse_st {SDP_DESCR, SDP_MEDIA};
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enum sdp_connection_st {NET_TYPE, ADDR_TYPE, IP4, IP6};
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enum sdp_media_st {MEDIA, PORT, PROTO, FMT};
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enum sdp_attr_rtpmap_st {TYPE, ENC_NAME, CLK_RATE, ENC_PARAM};
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enum sdp_attr_fmtp_st {FORMAT, FORMAT_PARAM};
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enum sdp_origin_st {USER, ID, VERSION_ST, NETTYPE, ADDR, UNICAST_ADDR};
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// inline functions
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inline string net_t_2_str(int nt)
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{
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switch(nt){
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case NT_IN: return "IN";
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default: return "<unknown network type>";
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}
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}
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inline string addr_t_2_str(int at)
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{
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switch(at){
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case AT_V4: return "IP4";
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case AT_V6: return "IP6";
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default: return "<unknown address type>";
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}
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}
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inline string media_t_2_str(int mt)
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{
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switch(mt){
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case MT_AUDIO: return "audio";
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case MT_VIDEO: return "video";
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case MT_APPLICATION: return "application";
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case MT_TEXT: return "text";
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case MT_MESSAGE: return "message";
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case MT_IMAGE: return "image";
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default: return "<unknown media type>";
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}
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}
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inline string transport_p_2_str(int tp)
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{
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switch(tp){
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case TP_RTPAVP: return "RTP/AVP";
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case TP_RTPAVPF: return "RTP/AVPF";
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case TP_UDP: return "udp";
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case TP_RTPSAVP: return "RTP/SAVP";
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case TP_RTPSAVPF: return "RTP/SAVPF";
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case TP_UDPTLSRTPSAVP: return "UDP/TLS/RTP/SAVP";
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case TP_UDPTLSRTPSAVPF: return "UDP/TLS/RTP/SAVPF";
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case TP_UDPTL: return "udptl";
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default: return "<unknown media type>";
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}
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}
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bool SdpConnection::operator == (const SdpConnection& other) const
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{
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return network == other.network && addrType == other.addrType
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&& address == other.address;
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}
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bool SdpOrigin::operator == (const SdpOrigin& other) const
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{
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return user == other.user && sessId == other.sessId
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&& sessV == other.sessV && conn == other.conn;
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}
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bool SdpPayload::operator == (const SdpPayload& other) const
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{
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return payload_type == other.payload_type && encoding_name == other.encoding_name
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&& clock_rate == other.clock_rate && encoding_param == other.encoding_param;
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}
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string SdpConnection::debugPrint() const {
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return addr_t_2_str(addrType) + " " + address;
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}
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string SdpMedia::debugPrint() const {
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string payload_list;
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for(std::vector<SdpPayload>::const_iterator it=
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payloads.begin(); it!= payloads.end(); it++) {
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if (it != payloads.begin())
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payload_list+=" ";
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payload_list+=int2str(it->payload_type);
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}
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return "port "+int2str(port) + ", payloads: "+payload_list;
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}
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string SdpMedia::type2str(int type)
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{
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return media_t_2_str(type);
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}
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bool SdpPayload::operator == (int r)
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{
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DBG("pl == r: payload_type = %i; r = %i\n", payload_type, r);
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return payload_type == r;
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}
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string SdpAttribute::print() const
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{
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if (value.empty())
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return "a="+attribute+CRLF;
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else
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return "a="+attribute+":"+value+CRLF;
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}
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bool SdpAttribute::operator==(const SdpAttribute& other) const
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{
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return attribute==other.attribute && (value.empty() || (value==other.value));
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}
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bool SdpMedia::operator == (const SdpMedia& other) const
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{
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if (payloads.empty()) {
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if (!other.payloads.empty())
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return false;
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} else if (other.payloads.empty()) {
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return false;
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} else {
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std::pair<vector<SdpPayload>::const_iterator, vector<SdpPayload>::const_iterator> pl_mismatch
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= std::mismatch(payloads.begin(), payloads.end(), other.payloads.begin());
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if (pl_mismatch.first != payloads.end() || pl_mismatch.second != other.payloads.end())
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return false;
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}
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if (attributes.empty()) {
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if (!other.attributes.empty()) {
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return false;
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}
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} else {
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std::pair<vector<SdpAttribute>::const_iterator, vector<SdpAttribute>::const_iterator> a_mismatch
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= std::mismatch(attributes.begin(), attributes.end(), other.attributes.begin());
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if (a_mismatch.first != attributes.end() || a_mismatch.second != other.attributes.end())
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return false;
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}
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return type == other.type && port == other.port && nports == other.nports
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&& transport == other.transport && conn == other.conn && dir == other.dir
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&& send == other.send && recv == other.recv;
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}
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//
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// class RtcpAddress: Methods
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//
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bool RtcpAddress::parse(const string &src)
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{
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port = 0;
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nettype.clear();
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addrtype.clear();
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address.clear();
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int len = src.size();
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if (len < 1) return false;
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enum { PORT, NET_TYPE, ADDR_TYPE, ADDR } s = PORT;
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// parsing (somehow) according to RFC 3605
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// rtcp-attribute = "a=rtcp:" port [nettype space addrtype space
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// connection-address] CRLF
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// nettype, addrtype is ignored
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for (int i = 0; i < len; ++i) {
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switch (s) {
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case (PORT):
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if (src[i] >= '0' && src[i] <= '9') port = port * 10 + (src[i] - '0');
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else if (src[i] == ' ') s = NET_TYPE;
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else return false; // error
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break;
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case NET_TYPE:
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if (src[i] == ' ') s = ADDR_TYPE;
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else nettype += src[i];
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break;
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case ADDR_TYPE:
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if (src[i] == ' ') s = ADDR;
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else addrtype += src[i];
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break;
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case ADDR:
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address += src[i];
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break;
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}
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}
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return s == PORT ||
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(s == ADDR && !address.empty());
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// FIXME: nettype, addrtype and addr should be verified
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}
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string RtcpAddress::print()
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{
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string s(int2str(port));
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if (!address.empty())
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s += " IN " + addrtype + " " + address;
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return s;
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}
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RtcpAddress::RtcpAddress(const string &attr_value): port(0)
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{
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if (!parse(attr_value))
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throw std::runtime_error("can't parse rtcp attribute value");
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}
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//
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// class AmSdp: Methods
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//
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AmSdp::AmSdp()
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: origin(),
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sessionName(),
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conn(),
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media(),
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version(0)
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{
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origin.user = "sems";
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origin.sessId = get_random();
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origin.sessV = get_random();
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}
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AmSdp::AmSdp(const AmSdp& p_sdp_msg)
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: version(p_sdp_msg.version),
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origin(p_sdp_msg.origin),
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sessionName(p_sdp_msg.sessionName),
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conn(p_sdp_msg.conn),
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media(p_sdp_msg.media),
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attributes(p_sdp_msg.attributes)
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{
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}
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int AmSdp::parse(const char* _sdp_msg)
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{
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char* s = (char*)_sdp_msg;
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clear();
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bool ret = parse_sdp_line_ex(this,s);
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if(!ret && conn.address.empty()){
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for(vector<SdpMedia>::iterator it = media.begin();
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!ret && (it != media.end()); ++it)
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ret = it->conn.address.empty();
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if(ret){
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ERROR("A connection field must be field must be present in every\n");
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ERROR("media description or at the session level.\n");
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}
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}
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return ret;
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}
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void AmSdp::print(string& body) const
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{
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string out_buf = "v="+int2str(version)+"\r\n"
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"o="+origin.user+" "+int2str(origin.sessId)+" "+
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int2str(origin.sessV)+" IN ";
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if (!origin.conn.address.empty())
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if (origin.conn.address.find(".") != std::string::npos)
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out_buf += "IP4 " + origin.conn.address + "\r\n";
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else
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out_buf += "IP6 " + origin.conn.address + "\r\n";
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else if (!conn.address.empty())
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if (conn.address.find(".") != std::string::npos)
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out_buf += "IP4 " + conn.address + "\r\n";
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else
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out_buf += "IP6 " + conn.address + "\r\n";
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else if (media.size() && !media[0].conn.address.empty())
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if (media[0].conn.address.find(".") != std::string::npos)
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out_buf += "IP4 " + media[0].conn.address + "\r\n";
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else
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out_buf += "IP6 " + media[0].conn.address + "\r\n";
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else
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out_buf += "IP4 0.0.0.0\r\n";
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out_buf +=
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"s="+sessionName+"\r\n";
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if (!conn.address.empty()) {
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if (conn.address.find(".") != std::string::npos)
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out_buf += "c=IN IP4 ";
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else
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out_buf += "c=IN IP6 ";
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out_buf += conn.address + "\r\n";
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}
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out_buf += "t=0 0\r\n";
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// add attributes (session level)
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for (std::vector<SdpAttribute>::const_iterator a_it=
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attributes.begin(); a_it != attributes.end(); a_it++) {
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out_buf += a_it->print();
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}
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for(std::vector<SdpMedia>::const_iterator media_it = media.begin();
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media_it != media.end(); media_it++) {
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out_buf += "m=" + media_t_2_str(media_it->type) + " " + int2str(media_it->port) + " " + transport_p_2_str(media_it->transport);
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string options;
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if (media_it->transport == TP_RTPAVP || media_it->transport == TP_RTPAVPF || media_it->transport == TP_RTPSAVP || media_it->transport == TP_RTPSAVPF || media_it->transport == TP_UDPTLSRTPSAVP || media_it->transport == TP_UDPTLSRTPSAVPF) {
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for(std::vector<SdpPayload>::const_iterator pl_it = media_it->payloads.begin();
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pl_it != media_it->payloads.end(); pl_it++) {
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out_buf += " " + int2str(pl_it->payload_type);
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// "a=rtpmap:" line
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if (!pl_it->encoding_name.empty()) {
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options += "a=rtpmap:" + int2str(pl_it->payload_type) + " "
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+ pl_it->encoding_name + "/" + int2str(pl_it->clock_rate);
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if(pl_it->encoding_param > 0){
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options += "/" + int2str(pl_it->encoding_param);
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}
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options += "\r\n";
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}
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// "a=fmtp:" line
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if(pl_it->sdp_format_parameters.size()){
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options += "a=fmtp:" + int2str(pl_it->payload_type) + " "
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+ pl_it->sdp_format_parameters + "\r\n";
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}
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}
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}
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else {
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// for other transports (UDP/UDPTL) just print out fmt
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out_buf += " " + media_it->fmt;
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// ... and continue with c=, attributes, ...
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}
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if (!media_it->conn.address.empty())
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out_buf += "\r\nc=IN " + addr_t_2_str(media_it->conn.addrType) +
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" " + media_it->conn.address;
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out_buf += "\r\n" + options;
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if(media_it->send){
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if(media_it->recv){
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out_buf += "a=sendrecv\r\n";
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}
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else {
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out_buf += "a=sendonly\r\n";
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}
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}
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else {
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if(media_it->recv){
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out_buf += "a=recvonly\r\n";
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}
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else {
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out_buf += "a=inactive\r\n";
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}
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}
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// add attributes (media level)
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for (std::vector<SdpAttribute>::const_iterator a_it=
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media_it->attributes.begin(); a_it != media_it->attributes.end(); a_it++) {
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out_buf += a_it->print();
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}
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switch (media_it->dir) {
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case SdpMedia::DirActive: out_buf += "a=direction:active\r\n"; break;
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case SdpMedia::DirPassive: out_buf += "a=direction:passive\r\n"; break;
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case SdpMedia::DirBoth: out_buf += "a=direction:both\r\n"; break;
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case SdpMedia::DirUndefined: break;
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}
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}
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body = out_buf;
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}
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const SdpPayload* AmSdp::telephoneEventPayload() const
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{
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return findPayload("telephone-event");
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}
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const SdpPayload *AmSdp::findPayload(const string& name) const
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{
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vector<SdpMedia>::const_iterator m_it;
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for (m_it = media.begin(); m_it != media.end(); ++m_it)
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{
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vector<SdpPayload>::const_iterator it = m_it->payloads.begin();
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for(; it != m_it->payloads.end(); ++it)
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{
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if (it->encoding_name == name)
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{
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return new SdpPayload(*it);
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}
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}
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}
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return NULL;
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}
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bool AmSdp::operator == (const AmSdp& other) const
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{
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if (attributes.empty()) {
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if (!other.attributes.empty())
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return false;
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} else if (other.attributes.empty()) {
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return false;
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} else {
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std::pair<vector<SdpAttribute>::const_iterator, vector<SdpAttribute>::const_iterator> a_mismatch
|
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= std::mismatch(attributes.begin(), attributes.end(), other.attributes.begin());
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if (a_mismatch.first != attributes.end() || a_mismatch.second != other.attributes.end())
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return false;
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}
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if (media.empty()) {
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if (!other.media.empty())
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return false;
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} else if (other.media.empty()) {
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return false;
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} else {
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std::pair<vector<SdpMedia>::const_iterator, vector<SdpMedia>::const_iterator> m_mismatch
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= std::mismatch(media.begin(), media.end(), other.media.begin());
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if (m_mismatch.first != media.end() || m_mismatch.second != other.media.end())
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return false;
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}
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return version == other.version && origin == other.origin
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&& sessionName == other.sessionName && uri == other.uri && conn == other.conn;
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}
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void AmSdp::clear()
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{
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version = 0;
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origin = SdpOrigin();
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sessionName.clear();
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uri.clear();
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conn = SdpConnection();
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attributes.clear();
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media.clear();
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l_origin = SdpOrigin();
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}
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void SdpMedia::calcAnswer(const AmPayloadProvider* payload_prov,
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SdpMedia& answer) const
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{
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if(!recv) answer.send = false;
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if(!send) answer.recv = false;
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|
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switch(dir){
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case SdpMedia::DirBoth:
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answer.dir = SdpMedia::DirBoth;
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break;
|
|
case SdpMedia::DirActive:
|
|
answer.dir = SdpMedia::DirPassive;
|
|
break;
|
|
case SdpMedia::DirPassive:
|
|
answer.dir = SdpMedia::DirActive;
|
|
break;
|
|
case SdpMedia::DirUndefined:
|
|
answer.dir = SdpMedia::DirUndefined;
|
|
break;
|
|
}
|
|
|
|
// Calculate the intersection with the offered set of payloads
|
|
vector<SdpPayload>::const_iterator it = payloads.begin();
|
|
for(; it!= payloads.end(); ++it) {
|
|
amci_payload_t* a_pl = NULL;
|
|
if(it->payload_type < DYNAMIC_PAYLOAD_TYPE_START) {
|
|
// try static payloads
|
|
a_pl = payload_prov->payload(it->payload_type);
|
|
}
|
|
|
|
if( a_pl) {
|
|
answer.payloads.push_back(SdpPayload(a_pl->payload_id,
|
|
a_pl->name,
|
|
a_pl->advertised_sample_rate,
|
|
0));
|
|
}
|
|
else {
|
|
// Try dynamic payloads
|
|
// and give a chance to broken
|
|
// implementation using a static payload number
|
|
// for dynamic ones.
|
|
|
|
int int_pt = payload_prov->
|
|
getDynPayload(it->encoding_name,
|
|
it->clock_rate,
|
|
it->encoding_param);
|
|
if(int_pt != -1){
|
|
answer.payloads.push_back(*it);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//parser
|
|
static bool parse_sdp_line_ex(AmSdp* sdp_msg, char*& s)
|
|
{
|
|
if (!s) return true; // SDP can't be empty, return error (true really used for failure?)
|
|
|
|
char* next=0; size_t line_len = 0;
|
|
register parse_st state;
|
|
//default state
|
|
state=SDP_DESCR;
|
|
DBG("parsing SDP message...\n");
|
|
|
|
while(*s != '\0'){
|
|
switch(state){
|
|
case SDP_DESCR:
|
|
switch(*s){
|
|
case 'v':
|
|
{
|
|
s = is_eql_next(s);
|
|
next = skip_till_next_line(s, line_len);
|
|
if (line_len) {
|
|
string version(s, line_len);
|
|
str2i(version, sdp_msg->version);
|
|
// DBG("parse_sdp_line_ex: found version '%s'\n", version.c_str());
|
|
} else {
|
|
sdp_msg->version = 0;
|
|
}
|
|
s = next;
|
|
state = SDP_DESCR;
|
|
break;
|
|
|
|
}
|
|
case 'o':
|
|
//DBG("parse_sdp_line_ex: found origin\n");
|
|
s = is_eql_next(s);
|
|
parse_sdp_origin(sdp_msg, s);
|
|
s = get_next_line(s);
|
|
state = SDP_DESCR;
|
|
break;
|
|
case 's':
|
|
{
|
|
s = is_eql_next(s);
|
|
next = skip_till_next_line(s, line_len);
|
|
if (line_len) {
|
|
sdp_msg->sessionName = string(s, line_len);
|
|
} else {
|
|
sdp_msg->sessionName.clear();
|
|
}
|
|
s = next;
|
|
break;
|
|
}
|
|
|
|
case 'u': {
|
|
s = is_eql_next(s);
|
|
next = skip_till_next_line(s, line_len);
|
|
if (line_len) {
|
|
sdp_msg->uri = string(s, line_len);
|
|
} else {
|
|
sdp_msg->uri.clear();
|
|
}
|
|
s = next;
|
|
} break;
|
|
|
|
case 'i':
|
|
case 'e':
|
|
case 'p':
|
|
case 'b':
|
|
case 't':
|
|
case 'k':
|
|
s = is_eql_next(s);
|
|
s = skip_till_next_line(s, line_len);
|
|
state = SDP_DESCR;
|
|
break;
|
|
case 'a':
|
|
s = is_eql_next(s);
|
|
parse_session_attr(sdp_msg, s, &next);
|
|
// next = get_next_line(s);
|
|
// parse_sdp_attr(sdp_msg, s);
|
|
s = next;
|
|
state = SDP_DESCR;
|
|
break;
|
|
case 'c':
|
|
s = is_eql_next(s);
|
|
s = parse_sdp_connection(sdp_msg, s, 'd');
|
|
state = SDP_DESCR;
|
|
break;
|
|
case 'm':
|
|
//DBG("parse_sdp_line_ex: found media\n");
|
|
state = SDP_MEDIA;
|
|
break;
|
|
|
|
default:
|
|
{
|
|
next = skip_till_next_line(s, line_len);
|
|
if (line_len) {
|
|
sdp_msg->uri = string(s, line_len);
|
|
} else {
|
|
sdp_msg->uri.clear();
|
|
}
|
|
|
|
next = skip_till_next_line(s, line_len);
|
|
if (line_len) {
|
|
DBG("parse_sdp_line: skipping unknown Session description %s=\n",
|
|
string(s, line_len).c_str());
|
|
}
|
|
s = next;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case SDP_MEDIA:
|
|
switch(*s){
|
|
case 'm':
|
|
s = is_eql_next(s);
|
|
parse_sdp_media(sdp_msg, s);
|
|
s = skip_till_next_line(s, line_len);
|
|
state = SDP_MEDIA;
|
|
break;
|
|
case 'i':
|
|
s = is_eql_next(s);
|
|
s = skip_till_next_line(s, line_len);
|
|
state = SDP_MEDIA;
|
|
break;
|
|
case 'c':
|
|
s = is_eql_next(s);
|
|
//DBG("parse_sdp_line: found media connection\n");
|
|
s = parse_sdp_connection(sdp_msg, s, 'm');
|
|
state = SDP_MEDIA;
|
|
break;
|
|
case 'b':
|
|
s = is_eql_next(s);
|
|
s = skip_till_next_line(s, line_len);
|
|
state = SDP_MEDIA;
|
|
break;
|
|
case 'k':
|
|
s = is_eql_next(s);
|
|
s = skip_till_next_line(s, line_len);
|
|
state = SDP_MEDIA;
|
|
break;
|
|
case 'a':
|
|
s = is_eql_next(s);
|
|
s = parse_sdp_attr(sdp_msg, s);
|
|
state = SDP_MEDIA;
|
|
break;
|
|
|
|
default :
|
|
{
|
|
next = skip_till_next_line(s, line_len);
|
|
if (line_len) {
|
|
DBG("parse_sdp_line: skipping unknown Media description '%.*s'\n",
|
|
(int)line_len, s);
|
|
}
|
|
s = next;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
static char* parse_sdp_connection(AmSdp* sdp_msg, char* s, char t)
|
|
{
|
|
|
|
char* connection_line=s;
|
|
char* next=0;
|
|
char* next_line=0;
|
|
size_t line_len = 0;
|
|
int parsing=1;
|
|
|
|
SdpConnection c;
|
|
|
|
next_line = skip_till_next_line(s, line_len);
|
|
if (line_len <= 7) { // should be at least c=IN IP4 ...
|
|
DBG("short connection line '%.*s'\n", (int)line_len, s);
|
|
return next_line;
|
|
}
|
|
|
|
register sdp_connection_st state;
|
|
state = NET_TYPE;
|
|
|
|
//DBG("parse_sdp_line_ex: parse_sdp_connection: parsing sdp connection\n");
|
|
|
|
while(parsing){
|
|
switch(state){
|
|
case NET_TYPE:
|
|
//Ignore NET_TYPE since it is always IN, fixme
|
|
c.network = NT_IN; // fixme
|
|
connection_line +=3; // fixme
|
|
state = ADDR_TYPE;
|
|
break;
|
|
case ADDR_TYPE:
|
|
{
|
|
string addr_type(connection_line,3);
|
|
|
|
string addr_type_uc = addr_type;
|
|
std::transform(addr_type_uc.begin(), addr_type_uc.end(), addr_type_uc.begin(), toupper);
|
|
connection_line +=4;
|
|
if(addr_type_uc == "IP4"){
|
|
c.addrType = AT_V4;
|
|
state = IP4;
|
|
}else if(addr_type_uc == "IP6"){
|
|
c.addrType = AT_V6;
|
|
state = IP6;
|
|
}else{
|
|
DBG("parse_sdp_connection: Unknown addr_type in c-line: '%s'\n", addr_type.c_str());
|
|
c.addrType = AT_NONE;
|
|
parsing = 0; // ???
|
|
}
|
|
break;
|
|
}
|
|
case IP4:
|
|
{
|
|
if(contains(connection_line, next_line, '/')){
|
|
next = parse_until(s, '/');
|
|
c.address = string(connection_line,int(next-connection_line)-2);
|
|
}else{
|
|
c.address = string(connection_line, line_len-7);
|
|
}
|
|
parsing = 0;
|
|
break;
|
|
}
|
|
|
|
case IP6:
|
|
{
|
|
if(contains(connection_line, next_line, '/')){
|
|
next = parse_until(s, '/');
|
|
c.address = string(connection_line, int(next-connection_line)-2);
|
|
}else{
|
|
c.address = string(connection_line, line_len-7);
|
|
}
|
|
parsing = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if(t == 'd') {
|
|
sdp_msg->conn = c;
|
|
DBG("SDP: got session level connection: %s\n", c.debugPrint().c_str());
|
|
} else if(t == 'm'){
|
|
SdpMedia& media = sdp_msg->media.back();
|
|
media.conn = c;
|
|
DBG("SDP: got media level connection: %s\n", c.debugPrint().c_str());
|
|
}
|
|
|
|
//DBG("parse_sdp_line_ex: parse_sdp_connection: done parsing sdp connection\n");
|
|
return next_line;
|
|
}
|
|
|
|
|
|
static void parse_sdp_media(AmSdp* sdp_msg, char* s)
|
|
{
|
|
SdpMedia m;
|
|
|
|
register sdp_media_st state;
|
|
state = MEDIA;
|
|
int parsing = 1;
|
|
char* media_line=s;
|
|
char* next=0;
|
|
char* line_end=0;
|
|
line_end = get_next_line(media_line);
|
|
SdpPayload payload;
|
|
unsigned int payload_type;
|
|
|
|
//DBG("parse_sdp_line_ex: parse_sdp_media: parsing media description...\n");
|
|
m.dir = SdpMedia::DirBoth;
|
|
|
|
while(parsing){
|
|
switch(state){
|
|
case MEDIA:
|
|
{
|
|
next = parse_until(media_line, ' ');
|
|
string media;
|
|
if (next > media_line)
|
|
media = string(media_line, int(next-media_line)-1);
|
|
m.type = media_type(media);
|
|
if(m.type == MT_NONE) {
|
|
ERROR("parse_sdp_media: Unknown media type\n");
|
|
}
|
|
media_line = next;
|
|
state = PORT;
|
|
break;
|
|
}
|
|
case PORT:
|
|
{
|
|
next = parse_until(media_line, ' ');
|
|
//check for multiple ports
|
|
if(contains(media_line, next, '/')){
|
|
//port number
|
|
next = parse_until(media_line, '/');
|
|
string port;
|
|
if (next > media_line)
|
|
port = string(media_line, int(next-media_line)-1);
|
|
str2i(port, m.port);
|
|
//number of ports
|
|
media_line = next;
|
|
next = parse_until(media_line, ' ');
|
|
string nports;
|
|
if (next > media_line)
|
|
nports = string(media_line, int(next-media_line)-1);
|
|
str2i(nports, m.nports);
|
|
}else{
|
|
//port number
|
|
next = parse_until(media_line, ' ');
|
|
string port;
|
|
if (next > media_line)
|
|
port = string(media_line, int(next-media_line)-1);
|
|
str2i(port, m.port);
|
|
media_line = next;
|
|
}
|
|
state = PROTO;
|
|
break;
|
|
}
|
|
case PROTO:
|
|
{
|
|
next = parse_until(media_line, ' ');
|
|
string proto;
|
|
if (next > media_line)
|
|
proto = string(media_line, int(next-media_line)-1);
|
|
// if(transport_type(proto) < 0){
|
|
// ERROR("parse_sdp_media: Unknown transport protocol\n");
|
|
// state = FMT;
|
|
// break;
|
|
// }
|
|
m.transport = transport_type(proto);
|
|
if(m.transport == TP_NONE){
|
|
DBG("Unknown transport protocol: %s\n",proto.c_str());
|
|
}
|
|
media_line = next;
|
|
state = FMT;
|
|
break;
|
|
}
|
|
case FMT:
|
|
{
|
|
if (m.transport == TP_RTPAVP || m.transport == TP_RTPAVPF || m.transport == TP_RTPSAVP || m.transport == TP_RTPSAVPF || m.transport == TP_UDPTLSRTPSAVP || m.transport == TP_UDPTLSRTPSAVPF) {
|
|
if (contains(media_line, line_end, ' ')) {
|
|
next = parse_until(media_line, ' ');
|
|
string value;
|
|
if (next > media_line)
|
|
value = string(media_line, int(next-media_line)-1);
|
|
|
|
if (!value.empty()) {
|
|
payload.type = m.type;
|
|
str2i(value, payload_type);
|
|
payload.payload_type = payload_type;
|
|
m.payloads.push_back(payload);
|
|
}
|
|
media_line = next;
|
|
} else {
|
|
string last_value;
|
|
if (line_end>media_line) {
|
|
if (*line_end == '\0') {
|
|
// last line in message
|
|
last_value = string(media_line, int(line_end-media_line));
|
|
} else {
|
|
last_value = string(media_line, int(line_end-media_line)-1);
|
|
}
|
|
}
|
|
if (!last_value.empty()) {
|
|
payload.type = m.type;
|
|
str2i(last_value, payload_type);
|
|
payload.payload_type = payload_type;
|
|
m.payloads.push_back(payload);
|
|
}
|
|
parsing = 0;
|
|
}
|
|
} else {
|
|
line_end--;
|
|
while (line_end > media_line &&
|
|
(*line_end == '\r' || *line_end == '\n'))
|
|
line_end--;
|
|
if (line_end>media_line)
|
|
m.fmt = string(media_line, line_end-media_line+1);
|
|
DBG("set media fmt to '%s'\n", m.fmt.c_str());
|
|
parsing = 0;
|
|
}
|
|
} break;
|
|
}
|
|
}
|
|
sdp_msg->media.push_back(m);
|
|
|
|
DBG("SDP: got media: %s\n", m.debugPrint().c_str());
|
|
//DBG("parse_sdp_line_ex: parse_sdp_media: done parsing media description \n");
|
|
return;
|
|
}
|
|
|
|
// session level attribute
|
|
static void parse_session_attr(AmSdp* sdp_msg, char* s, char** next) {
|
|
size_t line_len = 0;
|
|
*next = skip_till_next_line(s, line_len);
|
|
if (*next == s) {
|
|
WARN("premature end of SDP in session attr\n");
|
|
while (**next != '\0') (*next)++;
|
|
return;
|
|
}
|
|
char* attr_end = *next-1;
|
|
while (attr_end >= s &&
|
|
((*attr_end == LF) || (*attr_end == CR)))
|
|
attr_end--;
|
|
|
|
if (*attr_end == ':') {
|
|
WARN("incorrect SDP: value attrib without value: '%s'\n",
|
|
string(s, attr_end-s+1).c_str());
|
|
return;
|
|
}
|
|
|
|
char* col = parse_until(s, attr_end, ':');
|
|
|
|
if (col == attr_end) {
|
|
// property attribute
|
|
sdp_msg->attributes.push_back(SdpAttribute(string(s, attr_end-s+1)));
|
|
// DBG("got session attribute '%.*s\n", (int)(attr_end-s+1), s);
|
|
} else {
|
|
// value attribute
|
|
sdp_msg->attributes.push_back(SdpAttribute(string(s, col-s-1),
|
|
string(col, attr_end-col+1)));
|
|
// DBG("got session attribute '%.*s:%.*s'\n", (int)(col-s-1), s, (int)(attr_end-col+1), col);
|
|
}
|
|
}
|
|
|
|
// media level attribute
|
|
static char* parse_sdp_attr(AmSdp* sdp_msg, char* s)
|
|
{
|
|
if(sdp_msg->media.empty()){
|
|
ERROR("While parsing media options: no actual media !\n");
|
|
return s;
|
|
}
|
|
|
|
SdpMedia& media = sdp_msg->media.back();
|
|
|
|
SdpPayload payload;
|
|
|
|
register sdp_attr_rtpmap_st rtpmap_st;
|
|
register sdp_attr_fmtp_st fmtp_st;
|
|
rtpmap_st = TYPE;
|
|
fmtp_st = FORMAT;
|
|
char* attr_line=s;
|
|
char* next=0;
|
|
char* line_end=0;
|
|
size_t line_len = 0;
|
|
int parsing = 1;
|
|
line_end = skip_till_next_line(attr_line, line_len);
|
|
|
|
unsigned int payload_type, clock_rate, encoding_param = 0;
|
|
string encoding_name, params;
|
|
|
|
string attr;
|
|
if (!contains(attr_line, line_end, ':')) {
|
|
attr = string(attr_line, line_len);
|
|
attr_check(attr);
|
|
parsing = 0;
|
|
} else {
|
|
next = parse_until(attr_line, ':');
|
|
attr = string(attr_line, int(next-attr_line)-1);
|
|
attr_line = next;
|
|
}
|
|
|
|
if(attr == "rtpmap"){
|
|
while(parsing){
|
|
switch(rtpmap_st){
|
|
case TYPE:
|
|
{
|
|
next = parse_until(attr_line, ' ');
|
|
string type(attr_line, int(next-attr_line)-1);
|
|
str2i(type,payload_type);
|
|
attr_line = next;
|
|
rtpmap_st = ENC_NAME;
|
|
break;
|
|
}
|
|
case ENC_NAME:
|
|
{
|
|
if(contains(s, line_end, '/')){
|
|
next = parse_until(attr_line, '/');
|
|
string enc_name(attr_line, int(next-attr_line)-1);
|
|
encoding_name = enc_name;
|
|
attr_line = next;
|
|
rtpmap_st = CLK_RATE;
|
|
break;
|
|
} else {
|
|
rtpmap_st = ENC_PARAM;
|
|
break;
|
|
}
|
|
}
|
|
case CLK_RATE:
|
|
{
|
|
// check for posible encoding parameters after clock rate
|
|
if(contains(attr_line, line_end, '/')){
|
|
next = parse_until(attr_line, '/');
|
|
string clk_rate(attr_line, int(next-attr_line)-1);
|
|
str2i(clk_rate, clock_rate);
|
|
attr_line = next;
|
|
rtpmap_st = ENC_PARAM;
|
|
//last line check
|
|
}else if (*line_end == '\0') {
|
|
string clk_rate(attr_line, int(line_end-attr_line));
|
|
str2i(clk_rate, clock_rate);
|
|
parsing = 0;
|
|
//more lines to come
|
|
}else{
|
|
string clk_rate(attr_line, int(line_end-attr_line)-1);
|
|
str2i(clk_rate, clock_rate);
|
|
parsing=0;
|
|
}
|
|
|
|
break;
|
|
}
|
|
case ENC_PARAM:
|
|
{
|
|
next = parse_until(attr_line, ' ');
|
|
if(next < line_end){
|
|
string value(attr_line, int(next-attr_line)-1);
|
|
str2i(value, encoding_param);
|
|
attr_line = next;
|
|
rtpmap_st = ENC_PARAM;
|
|
}else{
|
|
string last_value(attr_line, int(line_end-attr_line)-1);
|
|
str2i(last_value, encoding_param);
|
|
parsing = 0;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
//DBG("found media attr 'rtpmap' type '%d'\n", payload_type);
|
|
|
|
vector<SdpPayload>::iterator pl_it;
|
|
|
|
for( pl_it=media.payloads.begin();
|
|
(pl_it != media.payloads.end())
|
|
&& (pl_it->payload_type != int(payload_type));
|
|
++pl_it);
|
|
|
|
if(pl_it != media.payloads.end()){
|
|
*pl_it = SdpPayload( int(payload_type),
|
|
encoding_name,
|
|
int(clock_rate),
|
|
int(encoding_param));
|
|
}
|
|
|
|
} else if(attr == "fmtp"){
|
|
while(parsing){
|
|
switch(fmtp_st){ // fixme
|
|
case FORMAT:
|
|
{
|
|
next = parse_until(attr_line, line_end, ' ');
|
|
string fmtp_format(attr_line, int(next-attr_line)-1);
|
|
str2i(fmtp_format, payload_type);
|
|
attr_line = next;
|
|
fmtp_st = FORMAT_PARAM;
|
|
break;
|
|
}
|
|
case FORMAT_PARAM:
|
|
{
|
|
char* param_end = line_end-1;
|
|
while (is_wsp(*param_end))
|
|
param_end--;
|
|
|
|
params = string(attr_line, param_end-attr_line+1);
|
|
parsing = 0;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
//DBG("found media attr 'fmtp' for payload '%d': '%s'\n",
|
|
// payload_type, params.c_str());
|
|
|
|
vector<SdpPayload>::iterator pl_it;
|
|
|
|
for(pl_it=media.payloads.begin();
|
|
(pl_it != media.payloads.end())
|
|
&& (pl_it->payload_type != int(payload_type));
|
|
pl_it++);
|
|
|
|
if(pl_it != media.payloads.end())
|
|
pl_it->sdp_format_parameters = params;
|
|
|
|
} else if (attr == "direction") {
|
|
if (parsing) {
|
|
size_t dir_len = 0;
|
|
next = skip_till_next_line(attr_line, dir_len);
|
|
string value(attr_line, dir_len);
|
|
if (value == "active") {
|
|
media.dir=SdpMedia::DirActive;
|
|
// DBG("found media attr 'direction' value '%s'\n", (char*)value.c_str());
|
|
} else if (value == "passive") {
|
|
media.dir=SdpMedia::DirPassive;
|
|
//DBG("found media attr 'direction' value '%s'\n", (char*)value.c_str());
|
|
} else if (attr == "both") {
|
|
media.dir=SdpMedia::DirBoth;
|
|
//DBG("found media attr 'direction' value '%s'\n", (char*)value.c_str());
|
|
} else {
|
|
DBG("found unknown value for media attribute 'direction'\n");
|
|
}
|
|
} else {
|
|
DBG("ignoring direction attribute without value\n");
|
|
}
|
|
} else if (attr == "sendrecv") {
|
|
media.send = true;
|
|
media.recv = true;
|
|
} else if (attr == "sendonly") {
|
|
media.send = true;
|
|
media.recv = false;
|
|
} else if (attr == "recvonly") {
|
|
media.send = false;
|
|
media.recv = true;
|
|
} else if (attr == "inactive") {
|
|
media.send = false;
|
|
media.recv = false;
|
|
} else {
|
|
attr_check(attr);
|
|
string value;
|
|
if (parsing) {
|
|
size_t attr_len = 0;
|
|
next = skip_till_next_line(attr_line, attr_len);
|
|
value = string (attr_line, attr_len);
|
|
}
|
|
|
|
// if (value.empty()) {
|
|
// DBG("got media attribute '%s'\n", attr.c_str());
|
|
// } else {
|
|
// DBG("got media attribute '%s':'%s'\n", attr.c_str(), value.c_str());
|
|
// }
|
|
media.attributes.push_back(SdpAttribute(attr, value));
|
|
}
|
|
return line_end;
|
|
}
|
|
|
|
static void parse_sdp_origin(AmSdp* sdp_msg, char* s)
|
|
{
|
|
char* origin_line = s;
|
|
char* next=0;
|
|
char* line_end=0;
|
|
size_t line_len=0;
|
|
line_end = skip_till_next_line(s, line_len);
|
|
|
|
register sdp_origin_st origin_st;
|
|
origin_st = USER;
|
|
int parsing = 1;
|
|
|
|
SdpOrigin origin;
|
|
|
|
//DBG("parse_sdp_line_ex: parse_sdp_origin: parsing sdp origin\n");
|
|
|
|
while(parsing){
|
|
switch(origin_st)
|
|
{
|
|
case USER:
|
|
{
|
|
next = parse_until(origin_line, ' ');
|
|
if(next > line_end){
|
|
DBG("parse_sdp_origin: ST_USER: Incorrect number of value in o=\n");
|
|
origin_st = UNICAST_ADDR;
|
|
break;
|
|
}
|
|
string user(origin_line, int(next-origin_line)-1);
|
|
origin.user = user;
|
|
origin_line = next;
|
|
origin_st = ID;
|
|
break;
|
|
}
|
|
case ID:
|
|
{
|
|
next = parse_until(origin_line, ' ');
|
|
if(next > line_end){
|
|
DBG("parse_sdp_origin: ST_ID: Incorrect number of value in o=\n");
|
|
origin_st = UNICAST_ADDR;
|
|
break;
|
|
}
|
|
string id(origin_line, int(next-origin_line)-1);
|
|
str2i(id, origin.sessId);
|
|
origin_line = next;
|
|
origin_st = VERSION_ST;
|
|
break;
|
|
}
|
|
case VERSION_ST:
|
|
{
|
|
next = parse_until(origin_line, ' ');
|
|
if(next > line_end){
|
|
DBG("parse_sdp_origin: ST_VERSION: Incorrect number of value in o=\n");
|
|
origin_st = UNICAST_ADDR;
|
|
break;
|
|
}
|
|
string version(origin_line, int(next-origin_line)-1);
|
|
str2i(version, origin.sessV);
|
|
origin_line = next;
|
|
origin_st = NETTYPE;
|
|
break;
|
|
}
|
|
case NETTYPE:
|
|
{
|
|
next = parse_until(origin_line, ' ');
|
|
if(next > line_end){
|
|
DBG("parse_sdp_origin: ST_NETTYPE: Incorrect number of value in o=\n");
|
|
origin_st = UNICAST_ADDR;
|
|
break;
|
|
}
|
|
string net_type(origin_line, int(next-origin_line)-1);
|
|
origin.conn.network = NT_IN; // fixme
|
|
origin_line = next;
|
|
origin_st = ADDR;
|
|
break;
|
|
}
|
|
case ADDR:
|
|
{
|
|
next = parse_until(origin_line, ' ');
|
|
if(next > line_end){
|
|
DBG("parse_sdp_origin: ST_ADDR: Incorrect number of value in o=\n");
|
|
origin_st = UNICAST_ADDR;
|
|
break;
|
|
}
|
|
|
|
string addr_type(origin_line, int(next-origin_line)-1);
|
|
if(addr_type == "IP4"){
|
|
origin.conn.addrType = AT_V4;
|
|
}else if(addr_type == "IP6"){
|
|
origin.conn.addrType = AT_V6;
|
|
}else{
|
|
DBG("parse_sdp_connection: Unknown addr_type in o line: '%s'\n", addr_type.c_str());
|
|
origin.conn.addrType = AT_NONE;
|
|
}
|
|
|
|
origin_line = next;
|
|
origin_st = UNICAST_ADDR;
|
|
break;
|
|
}
|
|
case UNICAST_ADDR:
|
|
{
|
|
next = parse_until(origin_line, ' ');
|
|
if (next != origin_line) {
|
|
//check if line contains more values than allowed
|
|
if(next > line_end){
|
|
size_t addr_len = 0;
|
|
skip_till_next_line(origin_line, addr_len);
|
|
origin.conn.address = string(origin_line, addr_len);
|
|
}else{
|
|
DBG("parse_sdp_origin: 'o=' contains more values than allowed; these values will be ignored\n");
|
|
origin.conn.address = string(origin_line, int(next-origin_line)-1);
|
|
}
|
|
} else {
|
|
origin.conn.address = "";
|
|
}
|
|
parsing = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
sdp_msg->origin = origin;
|
|
|
|
//DBG("parse_sdp_line_ex: parse_sdp_origin: done parsing sdp origin\n");
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
*HELPER FUNCTIONS
|
|
*/
|
|
|
|
static bool contains(char* s, char* next_line, char c)
|
|
{
|
|
char* line=s;
|
|
while((line != next_line-1) && (*line)){
|
|
if(*line == c)
|
|
return true;
|
|
line++;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool is_wsp(char s) {
|
|
return s==' ' || s == '\r' || s == '\n' || s == '\t';
|
|
}
|
|
|
|
static char* parse_until(char* s, char end)
|
|
{
|
|
char* line=s;
|
|
while(*line && *line != end ){
|
|
line++;
|
|
}
|
|
line++;
|
|
return line;
|
|
}
|
|
|
|
static char* parse_until(char* s, char* end, char c)
|
|
{
|
|
char* line=s;
|
|
while(line<end && *line && *line != c ){
|
|
line++;
|
|
}
|
|
if (line<end)
|
|
line++;
|
|
return line;
|
|
}
|
|
|
|
static size_t len_till_eol(char* s, char* end)
|
|
{
|
|
size_t res=0;
|
|
char* line=s;
|
|
while(line<end && *line && *line != '\r' && *line != '\n'){
|
|
line++;
|
|
res++;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static size_t len_till_char_or_eol(char* s, char* end, char c)
|
|
{
|
|
size_t res=0;
|
|
char* line=s;
|
|
while(line<end && *line && *line != c && *line != '\r' && *line != '\n'){
|
|
line++;
|
|
res++;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static char* is_eql_next(char* s)
|
|
{
|
|
char* current_line=s;
|
|
if(*(++current_line) != '='){
|
|
DBG("parse_sdp_line: expected '=' but found <%c> \n", *current_line);
|
|
}
|
|
current_line +=1;
|
|
return current_line;
|
|
}
|
|
|
|
inline char* get_next_line(char* s)
|
|
{
|
|
char* next_line=s;
|
|
//search for next line
|
|
while( *next_line != '\0') {
|
|
if(*next_line == CR){
|
|
next_line++;
|
|
if (*next_line == LF) {
|
|
next_line++;
|
|
break;
|
|
} else {
|
|
continue;
|
|
}
|
|
} else if (*next_line == LF){
|
|
next_line++;
|
|
break;
|
|
}
|
|
next_line++;
|
|
}
|
|
|
|
return next_line;
|
|
}
|
|
|
|
/* skip to 0, CRLF or LF;
|
|
@return line_len length of current line
|
|
@return start of next line
|
|
*/
|
|
inline char* skip_till_next_line(char* s, size_t& line_len)
|
|
{
|
|
char* next_line=s;
|
|
line_len = 0;
|
|
|
|
//search for next line
|
|
while( *next_line != '\0') {
|
|
if (*next_line == CR) {
|
|
next_line++;
|
|
if (*next_line == LF) {
|
|
next_line++;
|
|
break;
|
|
} else {
|
|
continue;
|
|
}
|
|
} else if (*next_line == LF){
|
|
next_line++;
|
|
break;
|
|
}
|
|
line_len++;
|
|
next_line++;
|
|
}
|
|
|
|
return next_line;
|
|
}
|
|
|
|
/*
|
|
*Check if known media type is used
|
|
*/
|
|
static MediaType media_type(std::string media)
|
|
{
|
|
if(media == "audio")
|
|
return MT_AUDIO;
|
|
else if(media == "video")
|
|
return MT_VIDEO;
|
|
else if(media == "application")
|
|
return MT_APPLICATION;
|
|
else if(media == "text")
|
|
return MT_TEXT;
|
|
else if(media == "message")
|
|
return MT_MESSAGE;
|
|
else if(media == "image")
|
|
return MT_IMAGE;
|
|
else
|
|
return MT_NONE;
|
|
}
|
|
|
|
static TransProt transport_type(string transport)
|
|
{
|
|
string transport_uc = transport;
|
|
std::transform(transport_uc.begin(), transport_uc.end(), transport_uc.begin(), toupper);
|
|
|
|
if(transport_uc == "RTP/AVP")
|
|
return TP_RTPAVP;
|
|
else if(transport_uc == "RTP/AVPF")
|
|
return TP_RTPAVPF;
|
|
else if(transport_uc == "UDP")
|
|
return TP_UDP;
|
|
else if(transport_uc == "RTP/SAVP")
|
|
return TP_RTPSAVP;
|
|
else if(transport_uc == "RTP/SAVPF")
|
|
return TP_RTPSAVPF;
|
|
else if(transport_uc == "UDP/TLS/RTP/SAVP")
|
|
return TP_UDPTLSRTPSAVP;
|
|
else if(transport_uc == "UDP/TLS/RTP/SAVPF")
|
|
return TP_UDPTLSRTPSAVPF;
|
|
else if(transport_uc == "UDPTL")
|
|
return TP_UDPTL;
|
|
else
|
|
return TP_NONE;
|
|
}
|
|
|
|
/*
|
|
*Check if known attribute name is used
|
|
*/
|
|
static bool attr_check(std::string attr)
|
|
{
|
|
if(attr == "cat")
|
|
return true;
|
|
else if(attr == "keywds")
|
|
return true;
|
|
else if(attr == "tool")
|
|
return true;
|
|
else if(attr == "ptime")
|
|
return true;
|
|
else if(attr == "maxptime")
|
|
return true;
|
|
else if(attr == "recvonly")
|
|
return true;
|
|
else if(attr == "sendrecv")
|
|
return true;
|
|
else if(attr == "sendonly")
|
|
return true;
|
|
else if(attr == "inactive")
|
|
return true;
|
|
else if(attr == "orient")
|
|
return true;
|
|
else if(attr == "type")
|
|
return true;
|
|
else if(attr == "charset")
|
|
return true;
|
|
else if(attr == "sdplang")
|
|
return true;
|
|
else if(attr == "lang")
|
|
return true;
|
|
else if(attr == "framerate")
|
|
return true;
|
|
else if(attr == "quality")
|
|
return true;
|
|
else if(attr == "both")
|
|
return true;
|
|
else if(attr == "active")
|
|
return true;
|
|
else if(attr == "passive")
|
|
return true;
|
|
else {
|
|
DBG("unknown attribute: %s\n", (char*)attr.c_str());
|
|
return false;
|
|
}
|
|
}
|
|
|