新增webrtc播放器datachannel消息广播机制和接口

src/Common/MediaSource.h

@@ -353,6 +353,8 @@ public:
         cb(std::list<toolkit::Any>());
     }
 
+    virtual bool broadcastMessage(const toolkit::Any &data) { return false; }
+
     // 获取媒体源类型
     MediaOriginType getOriginType() const;
     // 获取媒体源url或者文件路径

src/Rtsp/RtspMediaSource.h

@@ -55,9 +55,16 @@ public:
 
     void getPlayerList(const std::function<void(const std::list<toolkit::Any> &info_list)> &cb,
                        const std::function<toolkit::Any(toolkit::Any &&info)> &on_change) override {
+        assert(_ring);
         _ring->getInfoList(cb, on_change);
     }
 
+    bool broadcastMessage(const toolkit::Any &data) override {
+        assert(_ring);
+        _ring->sendMessage(data);
+        return true;
+    }
+
     /**
      * 获取播放器个数
      */