Unified code style (#2137)

src/Record/MP4Demuxer.h

@@ -18,7 +18,7 @@ namespace mediakit {
 
 class MP4Demuxer : public TrackSource {
 public:
-    typedef std::shared_ptr<MP4Demuxer> Ptr;
+    using Ptr = std::shared_ptr<MP4Demuxer>;
 
     /**
      * 创建mp4解复用器

src/Record/MP4Muxer.h

@@ -84,7 +84,7 @@ private:
 
 class MP4Muxer : public MP4MuxerInterface{
 public:
-    typedef std::shared_ptr<MP4Muxer> Ptr;
+    using Ptr = std::shared_ptr<MP4Muxer>;
 
     MP4Muxer() = default;
     ~MP4Muxer() override;

src/Record/MP4Recorder.h

@@ -15,6 +15,7 @@
 #include <memory>
 #include "Common/MediaSink.h"
 #include "Record/Recorder.h"
+#include "MP4Muxer.h"
 
 namespace mediakit {
 
@@ -60,7 +61,7 @@ private:
     std::string _full_path;
     std::string _full_path_tmp;
     RecordInfo _info;
-    std::shared_ptr<MP4Muxer> _muxer;
+    MP4Muxer::Ptr _muxer;
     std::list<Track::Ptr> _tracks;
     uint64_t _last_dts = 0;
 };