mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-22 19:00:01 +08:00
706 lines
21 KiB
C++
706 lines
21 KiB
C++
//
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// Created by xzl on 2021/3/27.
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//
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#ifndef ZLMEDIAKIT_SDP_H
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#define ZLMEDIAKIT_SDP_H
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#include <string>
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#include <vector>
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#include "assert.h"
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#include "Extension/Frame.h"
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using namespace std;
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using namespace mediakit;
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#define CHECK(exp) Assert_Throw(!(exp), #exp, __FUNCTION__, __FILE__, __LINE__);
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//https://datatracker.ietf.org/doc/rfc4566/?include_text=1
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//https://blog.csdn.net/aggresss/article/details/109850434
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//https://aggresss.blog.csdn.net/article/details/106436703
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//Session description
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// v= (protocol version)
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// o= (originator and session identifier)
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// s= (session name)
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// i=* (session information)
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// u=* (URI of description)
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// e=* (email address)
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// p=* (phone number)
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// c=* (connection information -- not required if included in
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// all media)
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// b=* (zero or more bandwidth information lines)
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// One or more time descriptions ("t=" and "r=" lines; see below)
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// z=* (time zone adjustments)
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// k=* (encryption key)
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// a=* (zero or more session attribute lines)
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// Zero or more media descriptions
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//
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// Time description
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// t= (time the session is active)
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// r=* (zero or more repeat times)
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//
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// Media description, if present
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// m= (media name and transport address)
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// i=* (media title)
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// c=* (connection information -- optional if included at
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// session level)
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// b=* (zero or more bandwidth information lines)
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// k=* (encryption key)
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// a=* (zero or more media attribute lines)
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enum class RtpDirection {
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invalid = -1,
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//只发送
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sendonly,
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//只接收
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recvonly,
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//同时发送接收
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sendrecv,
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//禁止发送数据
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inactive
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};
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enum class DtlsRole {
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invalid = -1,
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//客户端
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active,
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//服务端
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passive,
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//既可作做客户端也可以做服务端
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actpass,
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};
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enum class SdpType {
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invalid = -1,
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offer,
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answer
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};
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DtlsRole getDtlsRole(const string &str);
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const char* getDtlsRoleString(DtlsRole role);
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RtpDirection getRtpDirection(const string &str);
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const char* getRtpDirectionString(RtpDirection val);
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class SdpItem {
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public:
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using Ptr = std::shared_ptr<SdpItem>;
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virtual ~SdpItem() = default;
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virtual void parse(const string &str) {
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value = str;
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}
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virtual string toString() const {
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return value;
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}
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virtual const char* getKey() const = 0;
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protected:
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mutable string value;
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};
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template <char KEY>
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class SdpString : public SdpItem{
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public:
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SdpString() = default;
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SdpString(string val) {value = std::move(val);}
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// *=*
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const char* getKey() const override { static string key(1, KEY); return key.data();}
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};
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class SdpCommon : public SdpItem {
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public:
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string key;
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SdpCommon(string key) { this->key = std::move(key); }
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SdpCommon(string key, string val) {
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this->key = std::move(key);
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this->value = std::move(val);
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}
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const char* getKey() const override { return key.data();}
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};
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class SdpTime : public SdpItem{
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public:
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//5.9. Timing ("t=")
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// t=<start-time> <stop-time>
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uint64_t start {0};
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uint64_t stop {0};
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "t";}
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};
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class SdpOrigin : public SdpItem{
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public:
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// 5.2. Origin ("o=")
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// o=jdoe 2890844526 2890842807 IN IP4 10.47.16.5
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// o=<username> <sess-id> <sess-version> <nettype> <addrtype> <unicast-address>
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string username {"-"};
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string session_id;
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string session_version;
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string nettype {"IN"};
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string addrtype {"IP4"};
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string address {"0.0.0.0"};
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "o";}
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bool empty() const {
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return username.empty() || session_id.empty() || session_version.empty()
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|| nettype.empty() || addrtype.empty() || address.empty();
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}
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};
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class SdpConnection : public SdpItem {
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public:
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// 5.7. Connection Data ("c=")
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// c=IN IP4 224.2.17.12/127
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// c=<nettype> <addrtype> <connection-address>
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string nettype {"IN"};
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string addrtype {"IP4"};
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string address {"0.0.0.0"};
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "c";}
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bool empty() const {return address.empty();}
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};
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class SdpBandwidth : public SdpItem {
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public:
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//5.8. Bandwidth ("b=")
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//b=<bwtype>:<bandwidth>
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//AS、CT
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string bwtype {"AS"};
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uint32_t bandwidth {0};
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "b";}
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bool empty() const {return bandwidth == 0;}
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};
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class SdpMedia : public SdpItem {
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public:
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// 5.14. Media Descriptions ("m=")
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// m=<media> <port> <proto> <fmt> ...
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TrackType type;
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uint16_t port;
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//RTP/AVP：应用场景为视频/音频的 RTP 协议。参考 RFC 3551
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//RTP/SAVP：应用场景为视频/音频的 SRTP 协议。参考 RFC 3711
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//RTP/AVPF: 应用场景为视频/音频的 RTP 协议，支持 RTCP-based Feedback。参考 RFC 4585
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//RTP/SAVPF: 应用场景为视频/音频的 SRTP 协议，支持 RTCP-based Feedback。参考 RFC 5124
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string proto;
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vector<uint32_t> fmts;
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "m";}
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};
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class SdpAttr : public SdpItem{
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public:
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using Ptr = std::shared_ptr<SdpAttr>;
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//5.13. Attributes ("a=")
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//a=<attribute>
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//a=<attribute>:<value>
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SdpItem::Ptr detail;
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "a";}
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};
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class SdpAttrGroup : public SdpItem{
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public:
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//a=group:BUNDLE line with all the 'mid' identifiers part of the
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// BUNDLE group is included at the session-level.
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//a=group:LS session level attribute MUST be included wth the 'mid'
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// identifiers that are part of the same lip sync group.
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string type {"BUNDLE"};
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vector<string> mids;
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void parse(const string &str) override ;
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string toString() const override ;
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const char* getKey() const override { return "group";}
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};
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class SdpAttrMsidSemantic : public SdpItem {
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public:
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//https://tools.ietf.org/html/draft-alvestrand-rtcweb-msid-02#section-3
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//3. The Msid-Semantic Attribute
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//
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// In order to fully reproduce the semantics of the SDP and SSRC
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// grouping frameworks, a session-level attribute is defined for
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// signalling the semantics associated with an msid grouping.
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//
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// This OPTIONAL attribute gives the message ID and its group semantic.
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// a=msid-semantic: examplefoo LS
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//
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//
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// The ABNF of msid-semantic is:
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//
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// msid-semantic-attr = "msid-semantic:" " " msid token
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// token = <as defined in RFC 4566>
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//
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// The semantic field may hold values from the IANA registries
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// "Semantics for the "ssrc-group" SDP Attribute" and "Semantics for the
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// "group" SDP Attribute".
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//a=msid-semantic: WMS 616cfbb1-33a3-4d8c-8275-a199d6005549
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string msid{"WMS"};
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string token;
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "msid-semantic";}
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bool empty() const {
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return msid.empty();
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}
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};
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class SdpAttrRtcp : public SdpItem {
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public:
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// a=rtcp:9 IN IP4 0.0.0.0
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uint16_t port{0};
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string nettype {"IN"};
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string addrtype {"IP4"};
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string address {"0.0.0.0"};
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void parse(const string &str) override;;
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string toString() const override;
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const char* getKey() const override { return "rtcp";}
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bool empty() const {
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return address.empty() || !port;
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}
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};
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class SdpAttrIceUfrag : public SdpItem {
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public:
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SdpAttrIceUfrag() = default;
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SdpAttrIceUfrag(string str) {value = std::move(str);}
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//a=ice-ufrag:sXJ3
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const char* getKey() const override { return "ice-ufrag";}
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};
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class SdpAttrIcePwd : public SdpItem {
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public:
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SdpAttrIcePwd() = default;
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SdpAttrIcePwd(string str) {value = std::move(str);}
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//a=ice-pwd:yEclOTrLg1gEubBFefOqtmyV
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const char* getKey() const override { return "ice-pwd";}
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};
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class SdpAttrIceOption : public SdpItem {
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public:
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//a=ice-options:trickle
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bool trickle{false};
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bool renomination{false};
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "ice-options";}
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};
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class SdpAttrFingerprint : public SdpItem {
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public:
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//a=fingerprint:sha-256 22:14:B5:AF:66:12:C7:C7:8D:EF:4B:DE:40:25:ED:5D:8F:17:54:DD:88:33:C0:13:2E:FD:1A:FA:7E:7A:1B:79
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string algorithm;
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string hash;
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "fingerprint";}
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};
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class SdpAttrSetup : public SdpItem {
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public:
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//a=setup:actpass
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SdpAttrSetup() = default;
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SdpAttrSetup(DtlsRole r) { role = r; }
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DtlsRole role{DtlsRole::actpass};
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "setup";}
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};
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class SdpAttrMid : public SdpItem {
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public:
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SdpAttrMid() = default;
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SdpAttrMid(string val) { value = std::move(val); }
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//a=mid:audio
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const char* getKey() const override { return "mid";}
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};
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class SdpAttrExtmap : public SdpItem {
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public:
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//https://aggresss.blog.csdn.net/article/details/106436703
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//a=extmap:1[/sendonly] urn:ietf:params:rtp-hdrext:ssrc-audio-level
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uint32_t index;
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RtpDirection direction{RtpDirection::invalid};
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string ext;
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "extmap";}
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};
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class SdpAttrRtpMap : public SdpItem {
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public:
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//a=rtpmap:111 opus/48000/2
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uint8_t pt;
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string codec;
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uint32_t sample_rate;
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uint32_t channel {0};
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "rtpmap";}
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};
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class SdpAttrRtcpFb : public SdpItem {
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public:
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//a=rtcp-fb:98 nack pli
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//a=rtcp-fb:120 nack 支持 nack 重传，nack (Negative-Acknowledgment) 。
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//a=rtcp-fb:120 nack pli 支持 nack 关键帧重传，PLI (Picture Loss Indication) 。
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//a=rtcp-fb:120 ccm fir 支持编码层关键帧请求，CCM (Codec Control Message)，FIR (Full Intra Request )，通常与 nack pli 有同样的效果，但是 nack pli 是用于重传时的关键帧请求。
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//a=rtcp-fb:120 goog-remb 支持 REMB (Receiver Estimated Maximum Bitrate) 。
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//a=rtcp-fb:120 transport-cc 支持 TCC (Transport Congest Control) 。
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uint8_t pt;
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string rtcp_type;
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "rtcp-fb";}
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};
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class SdpAttrFmtp : public SdpItem {
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public:
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//fmtp:96 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f
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uint8_t pt;
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vector<std::pair<string, string> > arr;
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "fmtp";}
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};
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class SdpAttrSSRC : public SdpItem {
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public:
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//a=ssrc:3245185839 cname:Cx4i/VTR51etgjT7
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//a=ssrc:3245185839 msid:cb373bff-0fea-4edb-bc39-e49bb8e8e3b9 0cf7e597-36a2-4480-9796-69bf0955eef5
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//a=ssrc:3245185839 mslabel:cb373bff-0fea-4edb-bc39-e49bb8e8e3b9
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//a=ssrc:3245185839 label:0cf7e597-36a2-4480-9796-69bf0955eef5
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//a=ssrc:<ssrc-id> <attribute>
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//a=ssrc:<ssrc-id> <attribute>:<value>
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//cname 是必须的，msid/mslabel/label 这三个属性都是 WebRTC 自创的，或者说 Google 自创的，可以参考 https://tools.ietf.org/html/draft-ietf-mmusic-msid-17，
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// 理解它们三者的关系需要先了解三个概念：RTP stream / MediaStreamTrack / MediaStream ：
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//一个 a=ssrc 代表一个 RTP stream ；
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//一个 MediaStreamTrack 通常包含一个或多个 RTP stream，例如一个视频 MediaStreamTrack 中通常包含两个 RTP stream，一个用于常规传输，一个用于 nack 重传；
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//一个 MediaStream 通常包含一个或多个 MediaStreamTrack ，例如 simulcast 场景下，一个 MediaStream 通常会包含三个不同编码质量的 MediaStreamTrack ；
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//这种标记方式并不被 Firefox 认可，在 Firefox 生成的 SDP 中一个 a=ssrc 通常只有一行，例如：
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//a=ssrc:3245185839 cname:Cx4i/VTR51etgjT7
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uint32_t ssrc;
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string attribute;
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string attribute_value;
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "ssrc";}
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};
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class SdpAttrSSRCGroup : public SdpItem {
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public:
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//a=ssrc-group 定义参考 RFC 5576(https://tools.ietf.org/html/rfc5576) ，用于描述多个 ssrc 之间的关联，常见的有两种：
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//a=ssrc-group:FID 2430709021 3715850271
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// FID (Flow Identification) 最初用在 FEC 的关联中，WebRTC 中通常用于关联一组常规 RTP stream 和 重传 RTP stream 。
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//a=ssrc-group:SIM 360918977 360918978 360918980
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// 在 Chrome 独有的 SDP munging 风格的 simulcast 中使用，将三组编码质量由低到高的 MediaStreamTrack 关联在一起。
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string type{"FID"};
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union {
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struct {
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uint32_t rtp_ssrc;
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uint32_t rtx_ssrc;
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} fid;
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struct {
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uint32_t rtp_ssrc_low;
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uint32_t rtp_ssrc_mid;
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uint32_t rtp_ssrc_high;
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} sim;
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} u;
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bool isFID() const { return type == "FID"; }
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bool isSIM() const { return type == "SIM"; }
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "ssrc-group";}
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};
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class SdpAttrSctpMap : public SdpItem {
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public:
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//https://tools.ietf.org/html/draft-ietf-mmusic-sctp-sdp-05
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//a=sctpmap:5000 webrtc-datachannel 1024
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//a=sctpmap: sctpmap-number media-subtypes [streams]
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uint16_t port;
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string subtypes;
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uint32_t streams;
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void parse(const string &str) override;
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string toString() const override;
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const char* getKey() const override { return "sctpmap";}
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};
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class SdpAttrCandidate : public SdpItem {
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public:
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using Ptr = std::shared_ptr<SdpAttrCandidate>;
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//https://tools.ietf.org/html/rfc5245
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//15.1. "candidate" Attribute
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//a=candidate:4 1 udp 2 192.168.1.7 58107 typ host
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//a=candidate:<foundation> <component-id> <transport> <priority> <address> <port> typ <cand-type>
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string foundation;
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//传输媒体的类型,1代表RTP;2代表 RTCP。
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uint32_t component;
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string transport {"udp"};
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uint32_t priority;
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string address;
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uint16_t port;
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string type;
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vector<std::pair<string, string> > arr;
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|
||
void parse(const string &str) override;
|
||
string toString() const override;
|
||
const char* getKey() const override { return "candidate";}
|
||
};
|
||
|
||
class SdpAttrMsid : public SdpItem{
|
||
public:
|
||
const char* getKey() const override { return "msid";}
|
||
};
|
||
|
||
class SdpAttrExtmapAllowMixed : public SdpItem{
|
||
public:
|
||
const char* getKey() const override { return "extmap-allow-mixed";}
|
||
};
|
||
|
||
class SdpAttrSimulcast : public SdpItem{
|
||
public:
|
||
//todo
|
||
const char* getKey() const override { return "simulcast";}
|
||
};
|
||
|
||
class SdpAttrRid : public SdpItem{
|
||
public:
|
||
//todo
|
||
const char* getKey() const override { return "rid";}
|
||
};
|
||
|
||
class RtcSdpBase {
|
||
public:
|
||
vector<SdpItem::Ptr> items;
|
||
|
||
public:
|
||
virtual ~RtcSdpBase() = default;
|
||
virtual string toString() const;
|
||
|
||
int getVersion() const;
|
||
SdpOrigin getOrigin() const;
|
||
string getSessionName() const;
|
||
string getSessionInfo() const;
|
||
SdpTime getSessionTime() const;
|
||
SdpConnection getConnection() const;
|
||
SdpBandwidth getBandwidth() const;
|
||
|
||
string getUri() const;
|
||
string getEmail() const;
|
||
string getPhone() const;
|
||
string getTimeZone() const;
|
||
string getEncryptKey() const;
|
||
string getRepeatTimes() const;
|
||
RtpDirection getDirection() const;
|
||
|
||
template<typename cls>
|
||
cls getItemClass(char key, const char *attr_key = nullptr) const{
|
||
auto item = dynamic_pointer_cast<cls>(getItem(key, attr_key));
|
||
if (!item) {
|
||
return cls();
|
||
}
|
||
return *item;
|
||
}
|
||
|
||
string getStringItem(char key, const char *attr_key = nullptr) const{
|
||
auto item = getItem(key, attr_key);
|
||
if (!item) {
|
||
return "";
|
||
}
|
||
return item->toString();
|
||
}
|
||
|
||
SdpItem::Ptr getItem(char key, const char *attr_key = nullptr) const;
|
||
|
||
template<typename cls>
|
||
vector<cls> getAllItem(char key_c, const char *attr_key = nullptr) const {
|
||
vector<cls> ret;
|
||
for (auto item : items) {
|
||
string key(1, key_c);
|
||
if (strcasecmp(item->getKey(), key.data()) == 0) {
|
||
if (!attr_key) {
|
||
auto c = dynamic_pointer_cast<cls>(item);
|
||
if (c) {
|
||
ret.emplace_back(*c);
|
||
}
|
||
} else {
|
||
auto attr = dynamic_pointer_cast<SdpAttr>(item);
|
||
if (attr && !strcasecmp(attr->detail->getKey(), attr_key)) {
|
||
auto c = dynamic_pointer_cast<cls>(attr->detail);
|
||
if (c) {
|
||
ret.emplace_back(*c);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
return ret;
|
||
}
|
||
};
|
||
|
||
class RtcSessionSdp : public RtcSdpBase{
|
||
public:
|
||
vector<RtcSdpBase> medias;
|
||
void parse(const string &str);
|
||
string toString() const override;
|
||
};
|
||
|
||
//////////////////////////////////////////////////////////////////
|
||
|
||
//ssrc相关信息
|
||
class RtcSSRC{
|
||
public:
|
||
uint32_t ssrc {0};
|
||
string cname;
|
||
string msid;
|
||
string mslabel;
|
||
string label;
|
||
|
||
bool empty() const {return ssrc == 0 && cname.empty();}
|
||
};
|
||
|
||
//rtc传输编码方案
|
||
class RtcCodecPlan{
|
||
public:
|
||
uint8_t pt;
|
||
string codec;
|
||
uint32_t sample_rate;
|
||
//音频时有效
|
||
uint32_t channel = 0;
|
||
//rtcp反馈
|
||
vector<string> rtcp_fb;
|
||
vector<std::pair<string/*key*/, string/*value*/> > fmtp;
|
||
|
||
string getFmtp(const char *key) const;
|
||
};
|
||
|
||
//rtc 媒体描述
|
||
class RtcMedia{
|
||
public:
|
||
TrackType type{TrackType::TrackInvalid};
|
||
string mid;
|
||
uint16_t port{0};
|
||
SdpConnection addr;
|
||
string proto;
|
||
RtpDirection direction{RtpDirection::invalid};
|
||
vector<RtcCodecPlan> plan;
|
||
|
||
//////// rtp ////////
|
||
RtcSSRC rtp_ssrc;
|
||
RtcSSRC rtx_ssrc;
|
||
|
||
//////// simulcast ////////
|
||
RtcSSRC rtp_ssrc_low;
|
||
RtcSSRC rtp_ssrc_mid;
|
||
RtcSSRC rtp_ssrc_high;
|
||
|
||
//////// rtcp ////////
|
||
bool rtcp_mux{false};
|
||
bool rtcp_rsize{false};
|
||
SdpAttrRtcp rtcp_addr;
|
||
|
||
//////// ice ////////
|
||
bool ice_trickle{false};
|
||
bool ice_lite{false};
|
||
bool ice_renomination{false};
|
||
string ice_ufrag;
|
||
string ice_pwd;
|
||
std::vector<SdpAttrCandidate> candidate;
|
||
|
||
//////// dtls ////////
|
||
DtlsRole role{DtlsRole::invalid};
|
||
SdpAttrFingerprint fingerprint;
|
||
|
||
//////// extmap ////////
|
||
vector<SdpAttrExtmap> extmap;
|
||
|
||
//////// sctp ////////////
|
||
SdpAttrSctpMap sctpmap;
|
||
uint32_t sctp_port{0};
|
||
|
||
void checkValid() const;
|
||
const RtcCodecPlan *getPlan(uint8_t pt) const;
|
||
const RtcCodecPlan *getPlan(const char *codec) const;
|
||
const RtcCodecPlan *getRelatedRtxPlan(uint8_t pt) const;
|
||
};
|
||
|
||
class RtcSession{
|
||
public:
|
||
using Ptr = std::shared_ptr<RtcSession>;
|
||
|
||
uint32_t version;
|
||
SdpOrigin origin;
|
||
string session_name;
|
||
string session_info;
|
||
SdpTime time;
|
||
SdpConnection connection;
|
||
SdpBandwidth bandwidth;
|
||
SdpAttrMsidSemantic msid_semantic;
|
||
vector<RtcMedia> media;
|
||
SdpAttrGroup group;
|
||
|
||
void loadFrom(const string &sdp, bool check = true);
|
||
void checkValid() const;
|
||
string toString() const;
|
||
RtcMedia *getMedia(TrackType type);
|
||
};
|
||
|
||
class RtcConfigure {
|
||
public:
|
||
using Ptr = std::shared_ptr<RtcConfigure>;
|
||
class RtcTrackConfigure {
|
||
public:
|
||
bool enable;
|
||
bool rtcp_mux;
|
||
bool rtcp_rsize;
|
||
bool group_bundle;
|
||
bool support_rtx;
|
||
bool support_red;
|
||
bool support_ulpfec;
|
||
bool ice_lite;
|
||
bool ice_trickle;
|
||
bool ice_renomination;
|
||
string ice_ufrag;
|
||
string ice_pwd;
|
||
|
||
RtpDirection direction{RtpDirection::invalid};
|
||
SdpAttrFingerprint fingerprint;
|
||
|
||
vector<string> rtcp_fb;
|
||
vector<CodecId> preferred_codec;
|
||
vector<string> extmap;
|
||
vector<SdpAttrCandidate> candidate;
|
||
|
||
void setDefaultSetting(TrackType type);
|
||
};
|
||
|
||
RtcTrackConfigure video;
|
||
RtcTrackConfigure audio;
|
||
RtcTrackConfigure application;
|
||
|
||
void setDefaultSetting(string ice_ufrag,
|
||
string ice_pwd,
|
||
RtpDirection direction,
|
||
const SdpAttrFingerprint &fingerprint);
|
||
void addCandidate(const SdpAttrCandidate &candidate, TrackType type = TrackInvalid);
|
||
|
||
shared_ptr<RtcSession> createAnswer(const RtcSession &offer);
|
||
|
||
private:
|
||
void matchMedia(shared_ptr<RtcSession> &ret, TrackType type, const vector<RtcMedia> &medias, const RtcTrackConfigure &configure);
|
||
bool onMatchCodecPlan(const RtcCodecPlan &plan, CodecId codec) { return true; }
|
||
};
|
||
|
||
|
||
#endif //ZLMEDIAKIT_SDP_H
|