ref: a59ebb695f6e50298e8361fd3d40fd6cf0996ba8
dir: /frame.h/
typedef struct Frame Frame; struct Frame { uvlong dt; int w, h; struct { int left, top, right, bottom; }crop; u8int *yuv[3]; int ystride; int uvstride; u8int data[1]; }; Frame *newframe(int w, int h, u8int *yuv[3], int ystride, int vstride);