添加twcc相关api

webrtc/Sdp.cpp

@@ -921,7 +921,7 @@ void RtcSession::loadFrom(const string &str, bool check) {
             }
             for (auto rtpfb_it = rtcpfb_map.find(pt);
                  rtpfb_it != rtcpfb_map.end() && rtpfb_it->second.pt == pt; ++rtpfb_it) {
-                plan.rtcp_fb.emplace_back(rtpfb_it->second.rtcp_type);
+                plan.rtcp_fb.emplace(rtpfb_it->second.rtcp_type);
             }
         }
     }
@@ -1241,6 +1241,20 @@ const RtcMedia *RtcSession::getMedia(TrackType type) const{
     return nullptr;
 }
 
+static string const kTWCCRtcpFb = "transport-cc";
+static string const kTWCCExtMap = "http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01";
+
+
+void RtcConfigure::RtcTrackConfigure::enableTWCC(bool enable){
+    if (!enable) {
+        rtcp_fb.erase(kTWCCRtcpFb);
+        extmap.erase(kTWCCExtMap);
+    } else {
+        rtcp_fb.emplace(kTWCCRtcpFb);
+        extmap.emplace(kTWCCExtMap);
+    }
+}
+
 void RtcConfigure::RtcTrackConfigure::setDefaultSetting(TrackType type){
     enable = true;
     rtcp_mux = true;
@@ -1256,30 +1270,34 @@ void RtcConfigure::RtcTrackConfigure::setDefaultSetting(TrackType type){
         case TrackAudio: {
             //此处调整偏好的编码格式优先级
             preferred_codec = {CodecAAC, CodecG711U, CodecG711A, CodecOpus};
-            rtcp_fb = {"transport-cc"};
+            rtcp_fb = {kTWCCRtcpFb};
-            extmap = {"1 urn:ietf:params:rtp-hdrext:ssrc-audio-level",
+            extmap = {
-                      "2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time",
+                    kTWCCExtMap,
-                      "3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01",
+                    "urn:ietf:params:rtp-hdrext:ssrc-audio-level",
-                      "4 urn:ietf:params:rtp-hdrext:sdes:mid",
+                    "http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time",
-                      "5 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id",
+                    "urn:ietf:params:rtp-hdrext:sdes:mid",
-                      "6 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id"};
+                    "urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id",
+                    "urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id"
+            };
             break;
         }
         case TrackVideo: {
             //此处调整偏好的编码格式优先级
             preferred_codec = {CodecH264, CodecH265};
-            rtcp_fb = {"nack", "ccm fir", "nack pli", "goog-remb", "transport-cc"};
+            rtcp_fb = {kTWCCRtcpFb, "nack", "ccm fir", "nack pli", "goog-remb"};
-            extmap = {"14 urn:ietf:params:rtp-hdrext:toffset",
+            extmap = {
-                      "2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time",
+                    kTWCCExtMap,
-                      "13 urn:3gpp:video-orientation",
+                    "urn:ietf:params:rtp-hdrext:toffset",
-                      "3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01",
+                    "http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time",
-                      "12 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay",
+                    "urn:3gpp:video-orientation",
-                      "11 http://www.webrtc.org/experiments/rtp-hdrext/video-content-type",
+                    "http://www.webrtc.org/experiments/rtp-hdrext/playout-delay",
-                      "7 http://www.webrtc.org/experiments/rtp-hdrext/video-timing",
+                    "http://www.webrtc.org/experiments/rtp-hdrext/video-content-type",
-                      "8 http://www.webrtc.org/experiments/rtp-hdrext/color-space",
+                    "http://www.webrtc.org/experiments/rtp-hdrext/video-timing",
-                      "4 urn:ietf:params:rtp-hdrext:sdes:mid",
+                    "http://www.webrtc.org/experiments/rtp-hdrext/color-space",
-                      "5 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id",
+                    "urn:ietf:params:rtp-hdrext:sdes:mid",
-                      "6 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id"};
+                    "urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id",
+                    "urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id"
+            };
             break;
         }
         case TrackApplication: {
@@ -1333,6 +1351,29 @@ void RtcConfigure::addCandidate(const SdpAttrCandidate &candidate, TrackType typ
     }
 }
 
+void RtcConfigure::enableTWCC(bool enable, TrackType type){
+    switch (type) {
+        case TrackAudio: {
+            audio.enableTWCC(enable);
+            break;
+        }
+        case TrackVideo: {
+            video.enableTWCC(enable);
+            break;
+        }
+        case TrackApplication: {
+            application.enableTWCC(enable);
+            break;
+        }
+        default: {
+            audio.enableTWCC(enable);
+            video.enableTWCC(enable);
+            application.enableTWCC(enable);
+            break;
+        }
+    }
+}
+
 shared_ptr<RtcSession> RtcConfigure::createAnswer(const RtcSession &offer){
     shared_ptr<RtcSession> ret = std::make_shared<RtcSession>();
     ret->version = offer.version;
@@ -1479,35 +1520,22 @@ RETRY:
                 }
             }
 
-            //这是我们支持的扩展
+            //对方和我方都支持的扩展，那么我们才支持
-            unordered_set<string> extmap_set;
-            for (auto &ext : configure.extmap) {
-                SdpAttrExtmap ext_cfg;
-                ext_cfg.parse(ext);
-                extmap_set.emplace(ext_cfg.ext);
-            }
-
-            //对方和我方都支持的扩展，那么我们都支持
             for (auto &ext : offer_media.extmap) {
-                if (extmap_set.find(ext.ext) != extmap_set.end()) {
+                if (configure.extmap.find(ext.ext) != configure.extmap.end()) {
                     answer_media.extmap.emplace_back(ext);
                 }
             }
-            //我们支持的rtcp类型
+
-            unordered_set<string> rtcp_fb_set;
+            auto &rtcp_fb_ref = answer_media.plan[0].rtcp_fb;
-            for (auto &fp : configure.rtcp_fb) {
+            rtcp_fb_ref.clear();
-                rtcp_fb_set.emplace(fp);
+            //对方和我方都支持的rtcpfb，那么我们才支持
-            }
-            vector<string> offer_rtcp_fb;
             for (auto &fp : offer_plan_ptr->rtcp_fb) {
-                if (rtcp_fb_set.find(fp) != rtcp_fb_set.end()) {
+                if (configure.rtcp_fb.find(fp) != configure.rtcp_fb.end()) {
                     //对方该rtcp被我们支持
-                    offer_rtcp_fb.emplace_back(fp);
+                    rtcp_fb_ref.emplace(fp);
                 }
             }
-
-            //修改为我们支持的rtcp-fb类型
-            answer_media.plan[0].rtcp_fb.swap(offer_rtcp_fb);
             ret->media.emplace_back(answer_media);
             return;
         }

webrtc/Sdp.h

@@ -591,7 +591,7 @@ public:
     //音频时有效
     uint32_t channel = 0;
     //rtcp反馈
-    vector<string> rtcp_fb;
+    set<string> rtcp_fb;
     map<string/*key*/, string/*value*/, StrCaseCompare> fmtp;
 
     string getFmtp(const char *key) const;
@@ -693,12 +693,13 @@ public:
         RtpDirection direction{RtpDirection::invalid};
         SdpAttrFingerprint fingerprint;
 
-        vector<string> rtcp_fb;
+        set<string> rtcp_fb;
+        set<string> extmap;
         vector<CodecId> preferred_codec;
-        vector<string> extmap;
         vector<SdpAttrCandidate> candidate;
 
         void setDefaultSetting(TrackType type);
+        void enableTWCC(bool enable = true);
     };
 
     RtcTrackConfigure video;
@@ -715,6 +716,8 @@ public:
 
     void setPlayRtspInfo(const string &sdp);
 
+    void enableTWCC(bool enable = true, TrackType type = TrackInvalid);
+
 private:
     void matchMedia(shared_ptr<RtcSession> &ret, TrackType type, const vector<RtcMedia> &medias, const RtcTrackConfigure &configure);
     bool onCheckCodecProfile(const RtcCodecPlan &plan, CodecId codec);