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添加sdp自动化解析机制

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This commit is contained in:
xiongziliang 2021-03-28 09:49:34 +08:00
parent 3dac9e1c51
commit f4746d161c
2 changed files with 416 additions and 27 deletions
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228
webrtc/Sdp.cpp
View File

@ -3,3 +3,231 @@
//
#include "Sdp.h"
using onCreateSdpItem = function<SdpItem::Ptr(const string &key, const string &value)>;
static unordered_map<string, onCreateSdpItem> sdpItemCreator;
template <typename Item>
void registerSdpItem(){
onCreateSdpItem func = [](const string &key, const string &value) {
auto ret = std::make_shared<Item>();
ret->parse(value);
return ret;
};
Item item;
InfoL << "register sdp item:" << item.getKey();
sdpItemCreator.emplace(item.getKey(), std::move(func));
}
static bool registerAllItem(){
registerSdpItem<SdpString<'v'> >();
registerSdpItem<SdpString<'s'> >();
registerSdpItem<SdpString<'i'> >();
registerSdpItem<SdpString<'u'> >();
registerSdpItem<SdpString<'e'> >();
registerSdpItem<SdpString<'p'> >();
registerSdpItem<SdpString<'z'> >();
registerSdpItem<SdpString<'k'> >();
registerSdpItem<SdpString<'r'> >();
registerSdpItem<SdpTime>();
registerSdpItem<SdpOrigin>();
registerSdpItem<SdpConnection>();
registerSdpItem<SdpBandwidth>();
registerSdpItem<SdpMedia>();
registerSdpItem<SdpAttr>();
registerSdpItem<SdpAttrGroup>();
registerSdpItem<SdpAttrMsidSemantic>();
registerSdpItem<SdpAttrRtcp>();
registerSdpItem<SdpAttrIceUfrag>();
registerSdpItem<SdpAttrIcePwd>();
registerSdpItem<SdpAttrFingerprint>();
registerSdpItem<SdpAttrSetup>();
registerSdpItem<SdpAttrMid>();
registerSdpItem<SdpAttrExtmap>();
registerSdpItem<SdpAttrRtpMap>();
registerSdpItem<SdpAttrRtcpFb>();
registerSdpItem<SdpAttrFmtp>();
registerSdpItem<SdpAttrSSRC>();
registerSdpItem<SdpAttrSctpMap>();
return true;
}
void RtcSdp::parse(const string &str) {
static auto flag = registerAllItem();
RtcMedia *media = nullptr;
auto lines = split(str, "\n");
for(auto &line : lines){
trim(line);
if(line.size() < 3 || line[1] != '='){
continue;
}
auto key = line.substr(0, 1);
auto value = line.substr(2);
if (key == "m") {
medias.emplace_back(RtcMedia());
media = &medias.back();
}
SdpItem::Ptr item;
auto it = sdpItemCreator.find(key);
if (it != sdpItemCreator.end()) {
item = it->second(key, value);
} else {
item = std::make_shared<SdpCommon>(key);
item->parse(value);
}
if (media) {
media->items.push_back(std::move(item));
} else {
items.push_back(std::move(item));
}
}
}
string RtcSdp::toString() const {
return std::string();
}
void SdpAttr::parse(const string &str) {
SdpItem::parse(str);
auto pos = str.find(':');
auto key = pos == string::npos ? str : str.substr(0, pos);
auto value = pos == string::npos ? string() : str.substr(pos + 1);
auto it = sdpItemCreator.find(key);
if (it != sdpItemCreator.end()) {
detail = it->second(key, value);
} else {
detail = std::make_shared<SdpCommon>(key);
detail->parse(value);
}
}
void test_sdp(){
char str1[] = "v=0\n"
"o=- 380154348540553537 2 IN IP4 127.0.0.1\n"
"s=-\n"
"t=0 0\n"
"a=group:BUNDLE video\n"
"a=msid-semantic: WMS\n"
"m=video 9 RTP/SAVPF 96\n"
"c=IN IP4 0.0.0.0\n"
"a=rtcp:9 IN IP4 0.0.0.0\n"
"a=ice-ufrag:1ZFN\n"
"a=ice-pwd:70P3H0jPlGz1fiJl5XZfXMZH\n"
"a=ice-options:trickle\n"
"a=fingerprint:sha-256 3E:10:35:6B:9A:9E:B0:55:AC:2A:88:F5:74:C1:70:32:B5:8D:88:1D:37:B0:9C:69:A6:DD:07:10:73:27:1A:16\n"
"a=setup:active\n"
"a=mid:video\n"
"a=recvonly\n"
"a=rtcp-mux\n"
"a=rtpmap:96 H264/90000\n"
"a=fmtp:96 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f";
char str2[] = "v=0\n"
"o=- 2584450093346841581 2 IN IP4 127.0.0.1\n"
"s=-\n"
"t=0 0\n"
"a=group:BUNDLE audio video data\n"
"a=msid-semantic: WMS 616cfbb1-33a3-4d8c-8275-a199d6005549\n"
"m=audio 9 UDP/TLS/RTP/SAVPF 111 103 104 9 0 8 106 105 13 110 112 113 126\n"
"c=IN IP4 0.0.0.0\n"
"a=rtcp:9 IN IP4 0.0.0.0\n"
"a=ice-ufrag:sXJ3\n"
"a=ice-pwd:yEclOTrLg1gEubBFefOqtmyV\n"
"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\n"
"a=setup:actpass\n"
"a=mid:audio\n"
"a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level\n"
"a=sendrecv\n"
"a=rtcp-mux\n"
"a=rtpmap:111 opus/48000/2\n"
"a=rtcp-fb:111 transport-cc\n"
"a=fmtp:111 minptime=10;useinbandfec=1\n"
"a=rtpmap:103 ISAC/16000\n"
"a=rtpmap:104 ISAC/32000\n"
"a=rtpmap:9 G722/8000\n"
"a=rtpmap:0 PCMU/8000\n"
"a=rtpmap:8 PCMA/8000\n"
"a=rtpmap:106 CN/32000\n"
"a=rtpmap:105 CN/16000\n"
"a=rtpmap:13 CN/8000\n"
"a=rtpmap:110 telephone-event/48000\n"
"a=rtpmap:112 telephone-event/32000\n"
"a=rtpmap:113 telephone-event/16000\n"
"a=rtpmap:126 telephone-event/8000\n"
"a=ssrc:120276603 cname:iSkJ2vn5cYYubTve\n"
"a=ssrc:120276603 msid:616cfbb1-33a3-4d8c-8275-a199d6005549 1da3d329-7399-4fe9-b20f-69606bebd363\n"
"a=ssrc:120276603 mslabel:616cfbb1-33a3-4d8c-8275-a199d6005549\n"
"a=ssrc:120276603 label:1da3d329-7399-4fe9-b20f-69606bebd363\n"
"m=video 9 UDP/TLS/RTP/SAVPF 96 98 100 102 127 97 99 101 125\n"
"c=IN IP4 0.0.0.0\n"
"a=rtcp:9 IN IP4 0.0.0.0\n"
"a=ice-ufrag:sXJ3\n"
"a=ice-pwd:yEclOTrLg1gEubBFefOqtmyV\n"
"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\n"
"a=setup:actpass\n"
"a=mid:video\n"
"a=extmap:2 urn:ietf:params:rtp-hdrext:toffset\n"
"a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\n"
"a=extmap:4 urn:3gpp:video-orientation\n"
"a=extmap:5 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01\n"
"a=extmap:6 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay\n"
"a=sendrecv\n"
"a=rtcp-mux\n"
"a=rtcp-rsize\n"
"a=rtpmap:96 VP8/90000\n"
"a=rtcp-fb:96 ccm fir\n"
"a=rtcp-fb:96 nack\n"
"a=rtcp-fb:96 nack pli\n"
"a=rtcp-fb:96 goog-remb\n"
"a=rtcp-fb:96 transport-cc\n"
"a=rtpmap:98 VP9/90000\n"
"a=rtcp-fb:98 ccm fir\n"
"a=rtcp-fb:98 nack\n"
"a=rtcp-fb:98 nack pli\n"
"a=rtcp-fb:98 goog-remb\n"
"a=rtcp-fb:98 transport-cc\n"
"a=rtpmap:100 H264/90000\n"
"a=rtcp-fb:100 ccm fir\n"
"a=rtcp-fb:100 nack\n"
"a=rtcp-fb:100 nack pli\n"
"a=rtcp-fb:100 goog-remb\n"
"a=rtcp-fb:100 transport-cc\n"
"a=fmtp:100 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f\n"
"a=rtpmap:102 red/90000\n"
"a=rtpmap:127 ulpfec/90000\n"
"a=rtpmap:97 rtx/90000\n"
"a=fmtp:97 apt=96\n"
"a=rtpmap:99 rtx/90000\n"
"a=fmtp:99 apt=98\n"
"a=rtpmap:101 rtx/90000\n"
"a=fmtp:101 apt=100\n"
"a=rtpmap:125 rtx/90000\n"
"a=fmtp:125 apt=102\n"
"a=ssrc-group:FID 2580761338 611523443\n"
"a=ssrc:2580761338 cname:iSkJ2vn5cYYubTve\n"
"a=ssrc:2580761338 msid:616cfbb1-33a3-4d8c-8275-a199d6005549 bf270496-a23e-47b5-b901-ef23096cd961\n"
"a=ssrc:2580761338 mslabel:616cfbb1-33a3-4d8c-8275-a199d6005549\n"
"a=ssrc:2580761338 label:bf270496-a23e-47b5-b901-ef23096cd961\n"
"a=ssrc:611523443 cname:iSkJ2vn5cYYubTve\n"
"a=ssrc:611523443 msid:616cfbb1-33a3-4d8c-8275-a199d6005549 bf270496-a23e-47b5-b901-ef23096cd961\n"
"a=ssrc:611523443 mslabel:616cfbb1-33a3-4d8c-8275-a199d6005549\n"
"a=ssrc:611523443 label:bf270496-a23e-47b5-b901-ef23096cd961\n"
"a=candidate:1 1 udp %u %s %u typ host\n"
"m=application 9 DTLS/SCTP 5000\n"
"c=IN IP4 0.0.0.0\n"
"a=ice-ufrag:sXJ3\n"
"a=ice-pwd:yEclOTrLg1gEubBFefOqtmyV\n"
"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\n"
"a=setup:actpass\n"
"a=mid:data\n"
"a=sctpmap:5000 webrtc-datachannel 1024";
RtcSdp sdp1;
sdp1.parse(str1);
RtcSdp sdp2;
sdp2.parse(str2);
InfoL << sdp1.toString();
InfoL << sdp2.toString();
}

215
webrtc/Sdp.h
View File

@ -103,6 +103,7 @@ using namespace mediakit;
//a=ssrc:611523443 msid:616cfbb1-33a3-4d8c-8275-a199d6005549 bf270496-a23e-47b5-b901-ef23096cd961
//a=ssrc:611523443 mslabel:616cfbb1-33a3-4d8c-8275-a199d6005549
//a=ssrc:611523443 label:bf270496-a23e-47b5-b901-ef23096cd961
//a=candidate:1 1 udp %u %s %u typ host
//m=application 9 DTLS/SCTP 5000
//c=IN IP4 0.0.0.0
//a=ice-ufrag:sXJ3
@ -172,21 +173,40 @@ enum class SdpType {
class SdpItem {
public:
SdpItem() = default;
using Ptr = std::shared_ptr<SdpItem>;
string value;
virtual ~SdpItem() = default;
virtual void parse(const string &str) = 0;
virtual string toString() const = 0;
virtual void parse(const string &str) {
value = str;
}
virtual string toString() const {
return value;
}
virtual const char* getKey() = 0;
};
template <char KEY>
class SdpString : public SdpItem{
public:
// *=*
const char* getKey() override { static string key(1, KEY); return key.data();}
};
class SdpCommon : public SdpItem {
public:
string key;
SdpCommon(string key) { this->key = std::move(key); }
const char* getKey() override { return key.data();}
};
class SdpTime : public SdpItem{
public:
//5.9. Timing ("t=")
// t=<start-time> <stop-time>
uint64_t start;
uint64_t stop;
void parse(const string &str) override;
string toString() const override;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "t";}
};
@ -201,8 +221,8 @@ public:
string nettype;
string addrtype;
string address;
void parse(const string &str) override;
string toString() const override;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "o";}
};
@ -214,8 +234,8 @@ public:
string nettype;
string addrtype;
string address;
void parse(const string &str) override;
string toString() const override;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "c";}
};
@ -228,8 +248,8 @@ public:
string bwtype;
int bandwidth;
void parse(const string &str) override;
string toString() const override;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "b";}
};
@ -242,20 +262,20 @@ public:
vector<string> proto;
vector<uint8_t> fmt;
void parse(const string &str) override;
string toString() const override;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "m";}
};
class SdpAttr : public SdpItem{
public:
using Ptr = std::shared_ptr<SdpAttr>;
//5.13. Attributes ("a=")
//a=<attribute>
//a=<attribute>:<value>
string name;
string value;
SdpItem::Ptr detail;
void parse(const string &str) override;
string toString() const override;
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "a";}
};
@ -267,26 +287,168 @@ public:
// identifiers that are part of the same lip sync group.
string type;
vector<string> mid;
void parse(const string &str) override;
string toString() const override;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "group";}
};
class SdpAttrMsidSemantic : public SdpItem {
public:
string name{"WMS"};
string mid;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "msid-semantic";}
};
class SdpAttrRtcp : public SdpItem {
public:
// c=IN IP4 224.2.17.12/127
// c=<nettype> <addrtype> <connection-address>
uint16_t port;
string nettype;
string addrtype;
string address;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "rtcp";}
};
class SdpAttrIceUfrag : public SdpItem {
public:
//a=ice-ufrag:sXJ3
string value;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "ice-ufrag";}
};
class SdpAttrIcePwd : public SdpItem {
public:
//a=ice-pwd:yEclOTrLg1gEubBFefOqtmyV
string value;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "ice-pwd";}
};
class SdpAttrFingerprint : public SdpItem {
public:
//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
string algorithm;
string value;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "fingerprint";}
};
class SdpAttrSetup : public SdpItem {
public:
//a=setup:actpass
DtlsRole role{DtlsRole::invalid};
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "setup";}
};
class SdpAttrMid : public SdpItem {
public:
//a=mid:audio
string mid;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "mid";}
};
class SdpAttrExtmap : public SdpItem {
public:
//a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
int index;
string value;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "extmap";}
};
class SdpAttrRtpMap : public SdpItem {
public:
//a=rtpmap:111 opus/48000/2
uint8_t pt;
string codec;
int sample_rate;
int channel;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "rtpmap";}
};
class SdpAttrRtcpFb : public SdpItem {
public:
//a=rtcp-fb:111 transport-cc
uint8_t pt;
string value;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "rtcp-fb";}
};
class SdpAttrFmtp : public SdpItem {
public:
//a=rtcp-fb:111 transport-cc
uint8_t pt;
map<string, string> values;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "fmtp";}
};
class SdpAttrSSRC : public SdpItem {
public:
//a=ssrc:120276603 cname:iSkJ2vn5cYYubTve
uint32_t ssrc;
string key;
string value;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "ssrc";}
};
class SdpAttrSctpMap : public SdpItem {
public:
//a=ssrc:120276603 cname:iSkJ2vn5cYYubTve
uint16_t port;
string name;
int mtu;
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "sctpmap";}
};
class SdpAttrCandidate : public SdpItem {
public:
//a=candidate:%s 1 udp %u %s %u typ %s
void parse(const string &str) override {SdpItem::parse(str); };
string toString() const override { return SdpItem::toString(); };
const char* getKey() override { return "candidate";}
};
class RtcMedia {
public:
//m=<media> <port> <proto> <fmt> ...
SdpMedia media;
//c=<nettype> <addrtype> <connection-address>
SdpConnection connection;
//a=<attribute>:<value>
vector<SdpAttr> attributes;
vector<SdpItem::Ptr> items;
bool haveAttr(const char *attr) const;
string getAttrValue(const char *attr) const;
};
class RtcSdp {
public:
vector<SdpItem::Ptr> items;
vector<RtcMedia> medias;
void parse(const string &str);
string toString() const;
#if 0
/////Session description（会话级别描述）////
//v= (protocol version)
int version;
@ -319,8 +481,7 @@ public:
//r=* (zero or more repeat times)
//r=<repeat interval> <active duration> <offsets from start-time>
string repeat;
//a=* (zero or more media attribute lines)
vector<SdpAttr> attributes;
#endif
};