!17 【功能请求】 /index/api/getMediaList接口 增加LOSS字段用于统计每个轨道丢包率反馈

* update webrtc/WebRtcPusher.h.
* update webrtc/WebRtcPusher.cpp.
* update webrtc/WebRtcTransport.h.
* update webrtc/WebRtcTransport.cpp.
* update src/Common/MediaSource.h.
* update src/Common/MediaSource.cpp.
* update server/WebApi.cpp.

src/Common/MediaSource.cpp

@@ -1,4 +1,4 @@
-/*
+/*
  * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
  *
  * This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
@@ -213,6 +213,14 @@ bool MediaSource::close(bool force) {
     return listener->close(*this,force);
 }
 
+int MediaSource::getLossRate(mediakit::TrackType type) {
+    auto listener = _listener.lock();
+    if (!listener) {
+        return -1;
+    }
+    return listener->getLossRate(*this, type);
+}
+
 void MediaSource::onReaderChanged(int size) {
     auto listener = _listener.lock();
     if (listener) {
@@ -690,6 +698,14 @@ void MediaSourceEventInterceptor::onRegist(MediaSource &sender, bool regist) {
     }
 }
 
+int MediaSourceEventInterceptor::getLossRate(MediaSource &sender, TrackType type){
+    auto listener = _listener.lock();
+    if (listener) {
+        return listener->getLossRate(sender, type);
+    }
+    return -1; //异常返回-1
+}
+
 bool MediaSourceEventInterceptor::setupRecord(MediaSource &sender, Recorder::type type, bool start, const string &custom_path, size_t max_second) {
     auto listener = _listener.lock();
     if (!listener) {