Refine: 精简复用MediaSink相关代码

src/Player/PlayerBase.h

@@ -238,16 +238,37 @@ protected:
     std::shared_ptr<Delegate> _delegate;
 };
 
+class MediaSinkDelegate : public MediaSink {
+public:
+    MediaSinkDelegate() = default;
+    ~MediaSinkDelegate() override = default;
+
+    /**
+     * 设置track监听器
+     */
+    void setTrackListener(TrackListener *listener);
+
+protected:
+    void resetTracks() override;
+    bool onTrackReady(const Track::Ptr & track) override;
+    void onAllTrackReady() override;
+
+private:
+    TrackListener *_listener = nullptr;
+};
+
 class Demuxer : protected TrackListener, public TrackSource {
 public:
     Demuxer() = default;
     ~Demuxer() override = default;
 
     void setTrackListener(TrackListener *listener, bool wait_track_ready = false);
+    vector<Track::Ptr> getTracks(bool trackReady = true) const override;
+
+protected:
     bool addTrack(const Track::Ptr &track) override;
     void addTrackCompleted() override;
     void resetTracks() override;
-    vector<Track::Ptr> getTracks(bool trackReady = true) const override;
 
 private:
     MediaSink::Ptr _sink;