ibmcam.h
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上传日期:2013-02-24
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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: %sn", what);
- interruptible_sleep_on_timeout (&wq, HZ*3);
- }
- /*
- * This macro checks if ibmcam is still operational. The 'ibmcam'
- * pointer must be valid, ibmcam->dev must be valid, we are not
- * removing the device and the device has not erred on us.
- */
- #define IBMCAM_IS_OPERATIONAL(ibm_cam) (
- (ibm_cam != NULL) &&
- ((ibm_cam)->dev != NULL) &&
- ((ibm_cam)->last_error == 0) &&
- (!(ibm_cam)->remove_pending))
- 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 */
- int order_yc; /* True=Yc False=cY ('c'=either U or V) */
- 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 */
- };
- #define IBMCAM_MODEL_1 1 /* XVP-501, 3 interfaces, rev. 0.02 */
- #define IBMCAM_MODEL_2 2 /* KSX-X9903, 2 interfaces, rev. 3.0a */
- struct usb_ibmcam {
- struct video_device vdev;
- /* Device structure */
- struct usb_device *dev;
- unsigned char iface; /* Video interface number */
- unsigned char ifaceAltActive, ifaceAltInactive; /* Alt settings */
- struct semaphore lock;
- int user; /* user count for exclusive use */
- int ibmcam_used; /* Is this structure in use? */
- int initialized; /* Had we already sent init sequence? */
- int camera_model; /* What type of IBM camera we got? */
- int streaming; /* Are we streaming Isochronous? */
- int grabbing; /* Are we grabbing? */
- int last_error; /* What calamity struck us? */
- 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 */
- /*
- * 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 */