typedef struct BITMAPINFO BITMAPINFO;typedef struct WAVEFORMATEX WAVEFORMATEX;typedef struct AVIMainHeader AVIMainHeader;typedef struct AVIStreamHeader AVIStreamHeader;typedef struct AVIIndex AVIIndex;typedef struct AVI AVI; struct BITMAPINFO {	u32int size;	int width;	int height;	u16int planes;	u16int bitcount;	u32int compression;	u32int sizeimage;	int xppm;	int yppm;	u32int clrused;	u32int clrimportant;}; struct WAVEFORMATEX {	u16int tag;	u16int channels;	u32int samplespersec;	u32int avgbytespersec;	u16int blockalign;	u16int bitspersample;	u16int extrasize;}; struct AVIMainHeader {	u32int microsperframe;	u32int maxbytespersec;	u32int reserved1;	u32int flags;	u32int totalframes;	u32int initialframes;	u32int streams;	u32int suggestedbuffersize;	u32int width;	u32int height;	u32int reserved2;}; struct AVIStreamHeader {	char type[4];	char handler[4];	u32int flags;	u32int priority;	u32int initialframes;	u32int scale;	u32int rate;	u32int start;	u32int length;	u32int suggestedbuffersize;	u32int quality;	u32int samplesize; 	// RECT madness	int minx, miny, maxx, maxy;}; struct AVIIndex {	char id[4];	u32int flags;	u32int offset;	u32int length;}; struct AVI {	char path[256];	Biobuf *bio; 	AVIMainHeader header; 	// [0] is vids, [1] is auds	AVIStreamHeader stream[2]; 	BITMAPINFO bitmap;	WAVEFORMATEX waveformat; 	// offset of 'movi' chunk in bio	long movi; 	AVIIndex *index;	long nindex;}; void avidump(AVI*);AVI *aviopen(char*);