mmvideo_h.txt

Linux Kernel Programming by Examples(1)[Xeroo]

/** mmvideo.h
 *
 * author marco corvi <[e-mail]>
 * date   may 2003
 *
 * credits: after the stv680 driver (thanks)
 *
 */

#include <linux/timer.h>

#ifndef MM_VIDEO_H
#define MM_VIDEO_H

#define MMVIDEO_NUMFRAMES    2     // double buffer
#define MMVIDEO_TIMEOUT   1000

#define MMVIDEO_WIDTH      384
#define MMVIDEO_HEIGHT     288
#define MMVIDEO_DEPTH        3     // RGB
#define MMVIDEO_FRAMESIZE  331776  // 3 * 384 * 288
#define MMVIDEO_PALETTE    VIDEO_PALETTE_RGB24


enum {
  MMVIDEO_SQUARE,
  MMVIDEO_CROSS,
  MMVIDEO_CIRCLE,
  MMVIDEO_DIAMOND
};

#define MMVIDEO_FRAME_READY    0x01
#define MMVIDEO_FRAME_MMAP     0x10
#define MMVIDEO_FRAME_MMAPUSED 0x20

// mmvideo frames 
// data are stored as RGB triplets
struct mmvideo_frame {
  unsigned char * data;
};

struct mmvideo_device {
  struct video_device  vdev;
  struct video_picture vpict;

  int cwidth;     // camera width-height
  int cheight;
  int vwidth;     // video width-height
  int vheight;

  int user;       // number of users (max 1)

  int total_cnt;  // statistics
  int mmap_cnt;
  int error_cnt;
  int frame_cnt;
  int drop_cnt;

  unsigned char * fbuf;   // videodev buffer area
  unsigned char * hw_fbuf;   // videodev buffer area
  struct mmvideo_frame hw_frame[ 2 ];
  struct mmvideo_frame frame[ MMVIDEO_NUMFRAMES ];
  unsigned char frame_flag[ MMVIDEO_NUMFRAMES ];
  int frame_nr;           // index of the last captured frame
  int hw_frame_nr;           // index of the last captured frame
  int frame_to_read;

  struct proc_dir_entry * proc_entry;

  struct semaphore  lock;    // video_device has already a semaphore ...
  wait_queue_head_t wq;      // waiting processes
  struct timer_list timer;
  // struct file * file;     // open file
};


#endif // MM_VIDEO_H