修复调用mk_media_stop_send_rtp函数导致崩溃的bug

api/source/mk_media.cpp

@@ -193,7 +193,7 @@ API_EXPORT void API_CALL mk_media_start_send_rtp(mk_media ctx, const char *dst_u
     assert(ctx && dst_url && ssrc);
     MediaHelper::Ptr* obj = (MediaHelper::Ptr*) ctx;
     //sender参数无用
-    (*obj)->getChannel()->startSendRtp(*(MediaSource *) 1, dst_url, dst_port, ssrc, is_udp, 0, [cb, user_data](uint16_t local_port, const SockException &ex){
+    (*obj)->getChannel()->startSendRtp(*MediaSource::NullMediaSource, dst_url, dst_port, ssrc, is_udp, 0, [cb, user_data](uint16_t local_port, const SockException &ex){
         if (cb) {
             cb(user_data, local_port, ex.getErrCode(), ex.what());
         }
@@ -204,5 +204,5 @@ API_EXPORT int API_CALL mk_media_stop_send_rtp(mk_media ctx){
     assert(ctx);
     MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
     //sender参数无用
-    return (*obj)->getChannel()->stopSendRtp(*(MediaSource *) 1, "");
+    return (*obj)->getChannel()->stopSendRtp(*MediaSource::NullMediaSource, "");
 }
\ No newline at end of file

src/Common/MediaSource.h

@@ -191,11 +191,12 @@ private:
  */
 class MediaSource: public TrackSource, public enable_shared_from_this<MediaSource> {
 public:
-    typedef std::shared_ptr<MediaSource> Ptr;
-    typedef unordered_map<string, weak_ptr<MediaSource> > StreamMap;
-    typedef unordered_map<string, StreamMap > AppStreamMap;
-    typedef unordered_map<string, AppStreamMap > VhostAppStreamMap;
-    typedef unordered_map<string, VhostAppStreamMap > SchemaVhostAppStreamMap;
+    static constexpr MediaSource *NullMediaSource = nullptr;
+    using Ptr = std::shared_ptr<MediaSource>;
+    using StreamMap = unordered_map<string, weak_ptr<MediaSource> >;
+    using AppStreamMap = unordered_map<string, StreamMap>;
+    using VhostAppStreamMap = unordered_map<string, AppStreamMap>;
+    using SchemaVhostAppStreamMap = unordered_map<string, VhostAppStreamMap>;
 
     MediaSource(const string &schema, const string &vhost, const string &app, const string &stream_id) ;
     virtual ~MediaSource() ;

src/Common/MultiMediaSourceMuxer.cpp

@@ -338,7 +338,7 @@ bool MultiMediaSourceMuxer::isRecording(MediaSource &sender, Recorder::type type
     return _muxer->isRecording(sender,type);
 }
 
-void MultiMediaSourceMuxer::startSendRtp(MediaSource &sender, const string &dst_url, uint16_t dst_port, const string &ssrc, bool is_udp, uint16_t src_port, const function<void(uint16_t local_port, const SockException &ex)> &cb){
+void MultiMediaSourceMuxer::startSendRtp(MediaSource &, const string &dst_url, uint16_t dst_port, const string &ssrc, bool is_udp, uint16_t src_port, const function<void(uint16_t local_port, const SockException &ex)> &cb){
 #if defined(ENABLE_RTPPROXY)
     RtpSender::Ptr rtp_sender = std::make_shared<RtpSender>(atoi(ssrc.data()));
     weak_ptr<MultiMediaSourceMuxer> weak_self = shared_from_this();
@@ -360,12 +360,14 @@ void MultiMediaSourceMuxer::startSendRtp(MediaSource &sender, const string &dst_
 #endif//ENABLE_RTPPROXY
 }
 
-bool MultiMediaSourceMuxer::stopSendRtp(MediaSource &sender, const string& ssrc){
+bool MultiMediaSourceMuxer::stopSendRtp(MediaSource &sender, const string &ssrc) {
 #if defined(ENABLE_RTPPROXY)
-    onceToken token(nullptr, [&]() {
-        //关闭rtp推流，可能触发无人观看事件
-        MediaSourceEventInterceptor::onReaderChanged(sender, totalReaderCount());
-    });
+    if (&sender != MediaSource::NullMediaSource) {
+        onceToken token(nullptr, [&]() {
+            //关闭rtp推流，可能触发无人观看事件
+            MediaSourceEventInterceptor::onReaderChanged(sender, totalReaderCount());
+        });
+    }
     if (ssrc.empty()) {
         //关闭全部
         lock_guard<mutex> lck(_rtp_sender_mtx);