新增媒体流flush机制：#1996

src/Rtmp/RtmpMediaSource.h

@@ -60,7 +60,7 @@ public:
             MediaSource(RTMP_SCHEMA, vhost, app, stream_id), _ring_size(ring_size) {
     }
 
-    ~RtmpMediaSource() override{}
+    ~RtmpMediaSource() override { flush(); }
 
     /**
      * 	获取媒体源的环形缓冲

src/Rtmp/RtmpMediaSourceImp.h

@@ -26,9 +26,9 @@
 
 namespace mediakit {
 
-class RtmpMediaSourceImp: public RtmpMediaSource, private TrackListener, public MultiMediaSourceMuxer::Listener {
+class RtmpMediaSourceImp final : public RtmpMediaSource, private TrackListener, public MultiMediaSourceMuxer::Listener {
 public:
-    typedef std::shared_ptr<RtmpMediaSourceImp> Ptr;
+    using Ptr = std::shared_ptr<RtmpMediaSourceImp>;
 
     /**
      * 构造函数
@@ -42,7 +42,7 @@ public:
         _demuxer->setTrackListener(this);
     }
 
-    ~RtmpMediaSourceImp() = default;
+    ~RtmpMediaSourceImp() override = default;
 
     /**
      * 设置metadata

src/Rtmp/RtmpMediaSourceMuxer.h

@@ -16,8 +16,8 @@
 
 namespace mediakit {
 
-class RtmpMediaSourceMuxer : public RtmpMuxer, public MediaSourceEventInterceptor,
-                             public std::enable_shared_from_this<RtmpMediaSourceMuxer> {
+class RtmpMediaSourceMuxer final : public RtmpMuxer, public MediaSourceEventInterceptor,
+                                   public std::enable_shared_from_this<RtmpMediaSourceMuxer> {
 public:
     typedef std::shared_ptr<RtmpMediaSourceMuxer> Ptr;
 
@@ -29,7 +29,7 @@ public:
         getRtmpRing()->setDelegate(_media_src);
     }
 
-    ~RtmpMediaSourceMuxer() override{}
+    ~RtmpMediaSourceMuxer() override { RtmpMuxer::flush(); }
 
     void setListener(const std::weak_ptr<MediaSourceEvent> &listener){
         setDelegate(listener);

src/Rtmp/RtmpMuxer.cpp

@@ -43,6 +43,14 @@ bool RtmpMuxer::inputFrame(const Frame::Ptr &frame) {
     return encoder ? encoder->inputFrame(frame) : false;
 }
 
+void RtmpMuxer::flush() {
+    for (auto &encoder : _encoder) {
+        if (encoder) {
+            encoder->flush();
+        }
+    }
+}
+
 void RtmpMuxer::makeConfigPacket(){
     for(auto &encoder : _encoder){
         if(encoder){

src/Rtmp/RtmpMuxer.h

@@ -51,6 +51,11 @@ public:
      */
     bool inputFrame(const Frame::Ptr &frame) override;
 
+    /**
+     * 刷新输出所有frame缓存
+     */
+    void flush() override;
+
     /**
      * 重置所有track
      */