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app/src/frames.h

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+#ifndef FRAMES_H
+#define FRAMES_H
+
+#include <SDL2/SDL.h>
+
+// forward declarations
+typedef struct AVFrame AVFrame;
+typedef struct SDL_mutex SDL_mutex;
+typedef struct SDL_cond SDL_cond;
+
+struct frames {
+    AVFrame *decoding_frame;
+    AVFrame *rendering_frame;
+    SDL_mutex *mutex;
+    SDL_cond *rendering_frame_consumed_cond;
+    SDL_bool rendering_frame_consumed;
+};
+
+int frames_init(struct frames *frames);
+void frames_destroy(struct frames *frames);
+
+void frames_swap(struct frames *frames);
+
+#endif