新增webrtc播放器datachannel消息广播机制和接口

webrtc/WebRtcPlayer.cpp

@@ -71,6 +71,21 @@ void WebRtcPlayer::onStartWebRTC() {
             }
             strong_self->onShutdown(SockException(Err_shutdown, "rtsp ring buffer detached"));
         });
+
+        _reader->setMessageCB([weak_self] (const toolkit::Any &data) {
+            auto strong_self = weak_self.lock();
+            if (!strong_self) {
+                return;
+            }
+            if (data.is<Buffer>()) {
+                auto &buffer = data.get<Buffer>();
+                // PPID 51: 文本string
+                // PPID 53: 二进制
+                strong_self->sendDatachannel(0, 51, buffer.data(), buffer.size());
+            } else {
+                WarnL << "Send unknown message type to webrtc player: " << data.type_name();
+            }
+        });
     }
 }
 void WebRtcPlayer::onDestory() {

webrtc/WebRtcTransport.cpp

@@ -229,6 +229,19 @@ void WebRtcTransport::OnSctpAssociationMessageReceived(
     _sctp->SendSctpMessage(params, ppid, msg, len);
 }
 #endif
+
+void WebRtcTransport::sendDatachannel(uint16_t streamId, uint32_t ppid, const char *msg, size_t len) {
+#ifdef ENABLE_SCTP
+    if (_sctp) {
+        RTC::SctpStreamParameters params;
+        params.streamId = streamId;
+        _sctp->SendSctpMessage(params, ppid, (uint8_t *)msg, len);
+    }
+#else
+    WarnL << "WebRTC datachannel disabled!";
+#endif
+}
+
 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 void WebRtcTransport::sendSockData(const char *buf, size_t len, RTC::TransportTuple *tuple) {

webrtc/WebRtcTransport.h

@@ -112,6 +112,7 @@ public:
      */
     void sendRtpPacket(const char *buf, int len, bool flush, void *ctx = nullptr);
     void sendRtcpPacket(const char *buf, int len, bool flush, void *ctx = nullptr);
+    void sendDatachannel(uint16_t streamId, uint32_t ppid, const char *msg, size_t len);
 
     const EventPoller::Ptr& getPoller() const;
     Session::Ptr getSession() const;