新增媒体流flush机制：#1996

src/Rtsp/RtspMediaSource.h

@@ -56,7 +56,7 @@ public:
                     int ring_size = RTP_GOP_SIZE) :
             MediaSource(RTSP_SCHEMA, vhost, app, stream_id), _ring_size(ring_size) {}
 
-    ~RtspMediaSource() override{}
+    ~RtspMediaSource() override { flush(); }
 
     /**
      * 获取媒体源的环形缓冲

src/Rtsp/RtspMediaSourceImp.h

@@ -17,9 +17,9 @@
 #include "Common/MultiMediaSourceMuxer.h"
 
 namespace mediakit {
-class RtspMediaSourceImp : public RtspMediaSource, private TrackListener, public MultiMediaSourceMuxer::Listener  {
+class RtspMediaSourceImp final : public RtspMediaSource, private TrackListener, public MultiMediaSourceMuxer::Listener  {
 public:
-    typedef std::shared_ptr<RtspMediaSourceImp> Ptr;
+    using Ptr = std::shared_ptr<RtspMediaSourceImp>;
 
     /**
      * 构造函数
@@ -33,7 +33,7 @@ public:
         _demuxer->setTrackListener(this);
     }
 
-    ~RtspMediaSourceImp() = default;
+    ~RtspMediaSourceImp() override = default;
 
     /**
      * 设置sdp

src/Rtsp/RtspMediaSourceMuxer.h

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

src/Rtsp/RtspMuxer.cpp

@@ -86,6 +86,14 @@ bool RtspMuxer::inputFrame(const Frame::Ptr &frame) {
     return encoder ? encoder->inputFrame(frame) : false;
 }
 
+void RtspMuxer::flush() {
+    for (auto &encoder : _encoder) {
+        if (encoder) {
+            encoder->flush();
+        }
+    }
+}
+
 string RtspMuxer::getSdp() {
     return _sdp;
 }

src/Rtsp/RtspMuxer.h

@@ -73,6 +73,11 @@ 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
      */