em8300_fifo.h

linux TV 源码

#ifndef EM8300_FIFO_H
#define EM8300_FIFO_H

#define FIFOTYPE_AUDIO 1
#define FIFOTYPE_VIDEO 2

struct video_fifoslot_s {
	unsigned flags;
	unsigned physaddress_hi;
	unsigned physaddress_lo;
	unsigned slotsize;
};

struct audio_fifoslot_s {
	unsigned physaddress_hi;
	unsigned physaddress_lo;
	unsigned slotsize;
};

struct pts_fifoslot_s {
	unsigned streamoffset_hi;
	unsigned streamoffset_lo;
	unsigned pts_hi;
	unsigned pts_lo;
};

struct em8300_s;
typedef void (*preprocess_cb_t)(struct em8300_s *, unsigned char *,
				const unsigned char *, int);

struct fifo_s {
	struct em8300_s *em;
    
	int valid;

	int type;
	int nslots;
	union {
		struct video_fifoslot_s *v;
		struct audio_fifoslot_s *a;
		struct pts_fifoslot_s *pts;
	} slots;
	int slotptrsize;
	int slotsize;
	
	int start;
	int *writeptr;
	int *readptr;
	int localreadptr;
	int threshold;

	int bytes;

	char *fifobuffer;
	
	preprocess_cb_t preprocess_cb;
	int preprocess_ratio,preprocess_maxbufsize;
	
#if LINUX_VERSION_CODE < 0x020314    
	struct wait_queue *wait;
#else
	wait_queue_head_t wait;
#endif	
	int waiting;
};

struct em8300_s;

/*
  Prototypes
*/
int em8300_fifo_init(struct em8300_s *em, struct fifo_s *f,
		     int start, int wrptr, int rdptr,
		     int pcisize, int slotsize, int fifotype);

struct fifo_s * em8300_fifo_alloc(void);
void em8300_fifo_free(struct fifo_s *f);

int em8300_fifo_write(struct fifo_s *fifo, int n, const char *userbuffer,
		      int flags);
int em8300_fifo_writeblocking(struct fifo_s *fifo, int n,
			      const char *userbuffer, int flags);
int em8300_fifo_check(struct fifo_s *fifo);
int em8300_fifo_sync(struct fifo_s *fifo);
int em8300_fifo_freeslots(struct fifo_s *fifo);
void em8300_fifo_statusmsg(struct fifo_s *fifo, char *str);
int em8300_fifo_calcbuffered(struct fifo_s *fifo);
int em8300_fifo_isempty(struct fifo_s *fifo);

#endif /* EM8300_FIFO_H */