save timelapse stream to file

src/mp4enc.h

@@ -1,7 +1,8 @@
 #pragma once
 #include "image.h"
+#include "serializer.h"
 
-class MP4Encoder
+class MP4Encoder : public Serializer::Type
 {
     struct Frame
     {
@@ -14,7 +15,7 @@ class MP4Encoder
         std::vector<uint8_t> SPS_data;
         std::vector<uint8_t> PPS_data;
         uint8_t avc_profile;
-        uint8_t avc_profile_compat;
+        uint8_t avc_compat;
         uint8_t avc_level;
     };
     class ISVCEncoder* m_encoder = nullptr;
@@ -26,8 +27,13 @@ class MP4Encoder
     std::vector<Frame> m_frames;
     std::vector<uint8_t> m_yuv_buffer;
 public:
+    ~MP4Encoder();
+    bool init() noexcept;
     bool init(int width, int height, int fps, int bitrate) noexcept;
     bool encode(const Image& rgba) noexcept;
     bool write_mp4(const std::string& filename) const noexcept;
     void destroy() noexcept;
+    int frames_count() const noexcept { return m_frames.size(); }
+    virtual bool read(BinaryStreamReader& r) override;
+    virtual void write(BinaryStreamWriter& w) const override;
 };