typedef struct IVF IVF;
typedef struct IVFrame IVFrame;

struct IVF {
	uvlong ns₀;
	Biobuf *v;
	u32int tbdenum;
	u32int tbnum;
	u16int w;
	u16int h;
	char type[6];
};

struct IVFrame {
	uvlong ns;
	u8int *buf;
	int bufsz;
	int sz;
};

int ivfopen(Biobuf *v, IVF *ivf);
int ivfread(IVF *ivf, IVFrame *f);