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/*
* Header file for USB IBM C-It Video Camera driver.
*
* Supports IBM C-It Video Camera.
*
* This driver is based on earlier work of:
*
* (C) Copyright 1999 Johannes Erdfelt
* (C) Copyright 1999 Randy Dunlap
*/
#ifndef __LINUX_IBMCAM_H
#define __LINUX_IBMCAM_H
#include <linux/list.h>
#define USES_IBMCAM_PUTPIXEL 0 /* 0=Fast/oops 1=Slow/secure */
/* Video Size 384 x 288 x 3 bytes for RGB */
/* 384 because xawtv tries to grab 384 even though we tell it 352 is our max */
#define V4L_FRAME_WIDTH 384
#define V4L_FRAME_WIDTH_USED 352
#define V4L_FRAME_HEIGHT 288
#define V4L_BYTES_PER_PIXEL 3
#define MAX_FRAME_SIZE (V4L_FRAME_WIDTH * V4L_FRAME_HEIGHT * V4L_BYTES_PER_PIXEL)
/* Camera capabilities (maximum) */
#define CAMERA_IMAGE_WIDTH 352
#define CAMERA_IMAGE_HEIGHT 288
#define CAMERA_IMAGE_LINE_SZ ((CAMERA_IMAGE_WIDTH * 3) / 2) /* Bytes */
#define CAMERA_URB_FRAMES 32
#define CAMERA_MAX_ISO_PACKET 1023 /* 1022 actually sent by camera */
#define IBMCAM_NUMFRAMES 2
#define IBMCAM_NUMSBUF 2
#define FRAMES_PER_DESC (CAMERA_URB_FRAMES)
#define FRAME_SIZE_PER_DESC (CAMERA_MAX_ISO_PACKET)
/* This macro restricts an int variable to an inclusive range */
#define RESTRICT_TO_RANGE(v,mi,ma) { if ((v) < (mi)) (v) = (mi); else if ((v) > (ma)) (v) = (ma); }
/*
* This macro performs bounds checking - use it when working with
* new formats, or else you may get oopses all over the place.
* If pixel falls out of bounds then it gets shoved back (as close
* to place of offence as possible) and is painted bright red.
*/
#define IBMCAM_PUTPIXEL(fr, ix, iy, vr, vg, vb) { \
register unsigned char *pf; \
int limiter = 0, mx, my; \
mx = ix; \
my = iy; \
if (mx < 0) { \
mx=0; \
limiter++; \
} else if (mx >= 352) { \
mx=351; \
limiter++; \
} \
if (my < 0) { \
my = 0; \
limiter++; \
} else if (my >= V4L_FRAME_HEIGHT) { \
my = V4L_FRAME_HEIGHT - 1; \
limiter++; \
} \
pf = (fr)->data + V4L_BYTES_PER_PIXEL*((iy)*352 + (ix)); \
if (limiter) { \
*pf++ = 0; \
*pf++ = 0; \
*pf++ = 0xFF; \
} else { \
*pf++ = (vb); \
*pf++ = (vg); \
*pf++ = (vr); \
} \
}
/*
* We use macros to do YUV -> RGB conversion because this is
* very important for speed and totally unimportant for size.
*
* YUV -> RGB Conversion
* ---------------------
*
* B = 1.164*(Y-16) + 2.018*(V-128)
* G = 1.164*(Y-16) - 0.813*(U-128) - 0.391*(V-128)
* R = 1.164*(Y-16) + 1.596*(U-128)
*
* If you fancy integer arithmetics (as you should), hear this:
*
* 65536*B = 76284*(Y-16) + 132252*(V-128)
* 65536*G = 76284*(Y-16) - 53281*(U-128) - 25625*(V-128)
* 65536*R = 76284*(Y-16) + 104595*(U-128)
*
* Make sure the output values are within [0..255] range.
*/
#define LIMIT_RGB(x) (((x) < 0) ? 0 : (((x) > 255) ? 255 : (x)))
#define YUV_TO_RGB_BY_THE_BOOK(my,mu,mv,mr,mg,mb) { \
int mm_y, mm_yc, mm_u, mm_v, mm_r, mm_g, mm_b; \
mm_y = (my) - 16; \
mm_u = (mu) - 128; \
mm_v = (mv) - 128; \
mm_yc= mm_y * 76284; \
mm_b = (mm_yc + 132252*mm_v ) >> 16; \
mm_g = (mm_yc - 53281*mm_u - 25625*mm_v ) >> 16; \
mm_r = (mm_yc + 104595*mm_u ) >> 16; \
mb = LIMIT_RGB(mm_b); \
mg = LIMIT_RGB(mm_g); \
mr = LIMIT_RGB(mm_r); \
}
/* Debugging aid */
#define IBMCAM_SAY_AND_WAIT(what) { \
wait_queue_head_t wq; \
init_waitqueue_head(&wq); \
printk(KERN_INFO "Say: %s\n", what); \
interruptible_sleep_on_timeout (&wq, HZ*3); \
}
enum {
STATE_SCANNING, /* Scanning for header */
STATE_LINES, /* Parsing lines */
};
enum {
FRAME_UNUSED, /* Unused (no MCAPTURE) */
FRAME_READY, /* Ready to start grabbing */
FRAME_GRABBING, /* In the process of being grabbed into */
FRAME_DONE, /* Finished grabbing, but not been synced yet */
FRAME_ERROR, /* Something bad happened while processing */
};
struct usb_device;
struct ibmcam_sbuf {
char *data;
urb_t *urb;
};
struct ibmcam_frame {
char *data; /* Frame buffer */
int order_uv; /* True=UV False=VU */
unsigned char hdr_sig; /* "00 FF 00 ??" where 'hdr_sig' is '??' */
int width; /* Width application is expecting */
int height; /* Height */
int frmwidth; /* Width the frame actually is */
int frmheight; /* Height */
volatile int grabstate; /* State of grabbing */
int scanstate; /* State of scanning */
int curline; /* Line of frame we're working on */
long scanlength; /* uncompressed, raw data length of frame */
long bytes_read; /* amount of scanlength that has been read from *data */
wait_queue_head_t wq; /* Processes waiting */
};
struct usb_ibmcam {
struct video_device vdev;
/* Device structure */
struct usb_device *dev;
unsigned char iface;
struct semaphore lock;
int user; /* user count for exclusive use */
int initialized; /* Had we already sent init sequence? */
int streaming; /* Are we streaming Isochronous? */
int grabbing; /* Are we grabbing? */
int compress; /* Should the next frame be compressed? */
char *fbuf; /* Videodev buffer area */
int fbuf_size; /* Videodev buffer size */
int curframe;
struct ibmcam_frame frame[IBMCAM_NUMFRAMES]; /* Double buffering */
int cursbuf; /* Current receiving sbuf */
struct ibmcam_sbuf sbuf[IBMCAM_NUMSBUF]; /* Double buffering */
volatile int remove_pending; /* If set then about to exit */
wait_queue_head_t remove_ok; /* Wait here until removal is safe */
/*
* Scratch space from the Isochronous pipe.
* Scratch buffer should contain at least one pair of lines
* (CAMERA_IMAGE_LINE_SZ). We set it to two pairs here.
* This will be approximately 2 KB. HOWEVER in reality this
* buffer must be as large as hundred of KB because otherwise
* you'll get lots of overflows because V4L client may request
* frames not as uniformly as USB sources them.
*/
unsigned char *scratch;
int scratchlen;
struct video_picture vpic, vpic_old; /* Picture settings */
struct video_capability vcap; /* Video capabilities */
struct video_channel vchan; /* May be used for tuner support */
unsigned char video_endp; /* 0x82 for IBM camera */
int has_hdr;
int frame_num;
int iso_packet_len; /* Videomode-dependent, saves bus bandwidth */
/* Statistics that can be overlayed on screen */
unsigned long urb_count; /* How many URBs we received so far */
unsigned long urb_length; /* Length of last URB */
unsigned long data_count; /* How many bytes we received */
unsigned long header_count; /* How many frame headers we found */
unsigned long scratch_ovf_count;/* How many times we overflowed scratch */
unsigned long iso_skip_count; /* How many empty ISO packets received */
unsigned long iso_err_count; /* How many bad ISO packets received */
};
#endif /* __LINUX_IBMCAM_H */
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