Initial commit. Version 0.1

src/struct/video_buffer.h

@@ -0,0 +1,42 @@
+#ifndef SRC_VIDEO_BUFFER
+#define SRC_VIDEO_BUFFER
+
+extern "C"
+{
+#include <libavutil/frame.h> // For AVFrame
+}
+
+#include <atomic>
+
+#include "helper/error.h"
+
+#define BUFFER_VIDEO_FRAMES 3
+
+class VideoBuffer
+{
+public:
+    VideoBuffer();
+    ~VideoBuffer();
+    
+    Error allocate(uint16_t width, uint16_t height);
+    uint16_t width() const { return _width; };
+    uint16_t height() const { return _height; };
+    void reset();
+    bool getLatest(AVFrame **frame, uint32_t *id);
+    void consumeLatest();
+    const AVFrame *writeFrame(uint32_t id);
+    void commitFrame();
+
+private:
+    void deallocate();
+
+    uint16_t _width;
+    uint16_t _height;
+    std::atomic<int8_t> _latest;
+    std::atomic<int8_t> _reading;
+    std::atomic<int8_t> _writing;
+    AVFrame *_frames[BUFFER_VIDEO_FRAMES] = {nullptr, nullptr, nullptr};
+    uint32_t _ids[BUFFER_VIDEO_FRAMES];
+};
+
+#endif /* SRC_VIDEO_BUFFER */