aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/usbvideo/usbvideo.h
blob: 051775d4c72611c89a1a6aeda4ba8260d90e81c0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#ifndef usbvideo_h
#define	usbvideo_h

#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <linux/usb.h>
#include <linux/mutex.h>

/* Most helpful debugging aid */
#define assert(expr) ((void) ((expr) ? 0 : (err("assert failed at line %d",__LINE__))))

#define USBVIDEO_REPORT_STATS	1	/* Set to 0 to block statistics on close */

/* Bit flags (options) */
#define FLAGS_RETRY_VIDIOCSYNC		(1 << 0)
#define	FLAGS_MONOCHROME		(1 << 1)
#define FLAGS_DISPLAY_HINTS		(1 << 2)
#define FLAGS_OVERLAY_STATS		(1 << 3)
#define FLAGS_FORCE_TESTPATTERN		(1 << 4)
#define FLAGS_SEPARATE_FRAMES		(1 << 5)
#define FLAGS_CLEAN_FRAMES		(1 << 6)
#define	FLAGS_NO_DECODING		(1 << 7)

/* Bit flags for frames (apply to the frame where they are specified) */
#define USBVIDEO_FRAME_FLAG_SOFTWARE_CONTRAST	(1 << 0)

/* Camera capabilities (maximum) */
#define CAMERA_URB_FRAMES       32
#define CAMERA_MAX_ISO_PACKET   1023 /* 1022 actually sent by camera */
#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); }

#define V4L_BYTES_PER_PIXEL     3	/* Because we produce RGB24 */

/*
 * Use this macro to construct constants for different video sizes.
 * We have to deal with different video sizes that have to be
 * configured in the device or compared against when we receive
 * a data. Normally one would define a bunch of VIDEOSIZE_x_by_y
 * #defines and that's the end of story. However this solution
 * does not allow to convert between real pixel sizes and the
 * constant (integer) value that may be used to tag a frame or
 * whatever. The set of macros below constructs videosize constants
 * from the pixel size and allows to reconstruct the pixel size
 * from the combined value later.
 */
#define	VIDEOSIZE(x,y)	(((x) & 0xFFFFL) | (((y) & 0xFFFFL) << 16))
#define	VIDEOSIZE_X(vs)	((vs) & 0xFFFFL)
#define	VIDEOSIZE_Y(vs)	(((vs) >> 16) & 0xFFFFL)
typedef unsigned long videosize_t;

/*
 * This macro checks if the camera is still operational. The 'uvd'
 * pointer must be valid, uvd->dev must be valid, we are not
 * removing the device and the device has not erred on us.
 */
#define CAMERA_IS_OPERATIONAL(uvd) (\
	(uvd != NULL) && \
	((uvd)->dev != NULL) && \
	((uvd)->last_error == 0) && \
	(!(uvd)->remove_pending))

/*
 * 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); \
}

#define	RING_QUEUE_SIZE		(128*1024)	/* Must be a power of 2 */
#define	RING_QUEUE_ADVANCE_INDEX(rq,ind,n) (rq)->ind = ((rq)->ind + (n)) & ((rq)->length-1)
#define	RING_QUEUE_DEQUEUE_BYTES(rq,n) RING_QUEUE_ADVANCE_INDEX(rq,ri,n)
#define	RING_QUEUE_PEEK(rq,ofs) ((rq)->queue[((ofs) + (rq)->ri) & ((rq)->length-1)])

struct RingQueue {
	unsigned char *queue;	/* Data from the Isoc data pump */
	int length;		/* How many bytes allocated for the queue */
	int wi;			/* That's where we write */
	int ri;			/* Read from here until you hit write index */
	wait_queue_head_t wqh;	/* Processes waiting */
};

enum ScanState {
	ScanState_Scanning,	/* Scanning for header */
	ScanState_Lines		/* Parsing lines */
};

/* Completion states of the data parser */
enum ParseState {
	scan_Continue,		/* Just parse next item */
	scan_NextFrame,		/* Frame done, send it to V4L */
	scan_Out,		/* Not enough data for frame */
	scan_EndParse		/* End parsing */
};

enum FrameState {
	FrameState_Unused,	/* Unused (no MCAPTURE) */
	FrameState_Ready,	/* Ready to start grabbing */
	FrameState_Grabbing,	/* In the process of being grabbed into */
	FrameState_Done,	/* Finished grabbing, but not been synced yet */
	FrameState_Done_Hold,	/* Are syncing or reading */
	FrameState_Error,	/* Something bad happened while processing */
};

/*
 * Some frames may contain only even or odd lines. This type
 * specifies what type of deinterlacing is required.
 */
enum Deinterlace {
	Deinterlace_None=0,
	Deinterlace_FillOddLines,
	Deinterlace_FillEvenLines
};

#define USBVIDEO_NUMFRAMES	2	/* How many frames we work with */
#define USBVIDEO_NUMSBUF	2	/* How many URBs linked in a ring */

/* This structure represents one Isoc request - URB and buffer */
struct usbvideo_sbuf {
	char *data;
	struct urb *urb;
};

struct usbvideo_frame {
	char *data;		/* Frame buffer */
	unsigned long header;	/* Significant bits from the header */

	videosize_t canvas;	/* The canvas (max. image) allocated */
	videosize_t request;	/* That's what the application asked for */
	unsigned short palette;	/* The desired format */

	enum FrameState frameState;/* State of grabbing */
	enum ScanState scanstate;	/* State of scanning */
	enum Deinterlace deinterlace;
	int flags;		/* USBVIDEO_FRAME_FLAG_xxx bit flags */

	int curline;		/* Line of frame we're working on */

	long seqRead_Length;	/* Raw data length of frame */
	long seqRead_Index;	/* Amount of data that has been already read */

	void *user;		/* Additional data that user may need */
};

/* Statistics that can be overlaid on screen */
struct usbvideo_statistics {
	unsigned long frame_num;	/* Sequential number of the frame */
	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 iso_skip_count;	/* How many empty ISO packets received */
	unsigned long iso_err_count;	/* How many bad ISO packets received */
};

struct usbvideo;

struct uvd {
	struct video_device vdev;	/* Must be the first field! */
	struct usb_device *dev;
	struct usbvideo *handle;	/* Points back to the struct usbvideo */
	void *user_data;		/* Camera-dependent data */
	int user_size;			/* Size of that camera-dependent data */
	int debug;			/* Debug level for usbvideo */
	unsigned char iface;		/* Video interface number */
	unsigned char video_endp;
	unsigned char ifaceAltActive;
	unsigned char ifaceAltInactive; /* Alt settings */
	unsigned long flags;		/* FLAGS_USBVIDEO_xxx */
	unsigned long paletteBits;	/* Which palettes we accept? */
	unsigned short defaultPalette;	/* What palette to use for read() */
	struct mutex lock;
	int user;		/* user count for exclusive use */

	videosize_t videosize;	/* Current setting */
	videosize_t canvas;	/* This is the width,height of the V4L canvas */
	int max_frame_size;	/* Bytes in one video frame */

	int uvd_used;        	/* Is this structure in use? */
	int streaming;		/* Are we streaming Isochronous? */
	int grabbing;		/* Are we grabbing? */
	int settingsAdjusted;	/* Have we adjusted contrast etc.? */
	int last_error;		/* What calamity struck us? */

	char *fbuf;		/* Videodev buffer area */
	int fbuf_size;		/* Videodev buffer size */

	int curframe;
	int iso_packet_len;	/* Videomode-dependent, saves bus bandwidth */

	struct RingQueue dp;	/* Isoc data pump */
	struct usbvideo_frame frame[USBVIDEO_NUMFRAMES];
	struct usbvideo_sbuf sbuf[USBVIDEO_NUMSBUF];

	volatile int remove_pending;	/* If set then about to exit */

	struct video_picture vpic, vpic_old;	/* Picture settings */
	struct video_capability vcap;		/* Video capabilities */
	struct video_channel vchan;	/* May be used for tuner support */
	struct usbvideo_statistics stats;
	char videoName[32];		/* Holds name like "video7" */
};

/*
 * usbvideo callbacks (virtual methods). They are set when usbvideo
 * services are registered. All of these default to NULL, except those
 * that default to usbvideo-provided methods.
 */
struct usbvideo_cb {
	int (*probe)(struct usb_interface *, const struct usb_device_id *);
	void (*userFree)(struct uvd *);
	void (*disconnect)(struct usb_interface *);
	int (*setupOnOpen)(struct uvd *);
	void (*videoStart)(struct uvd *);
	void (*videoStop)(struct uvd *);
	void (*processData)(struct uvd *, struct usbvideo_frame *);
	void (*postProcess)(struct uvd *, struct usbvideo_frame *);
	void (*adjustPicture)(struct uvd *);
	int (*getFPS)(struct uvd *);
	int (*overlayHook)(struct uvd *, struct usbvideo_frame *);
	int (*getFrame)(struct uvd *, int);
	int (*startDataPump)(struct uvd *uvd);
	void (*stopDataPump)(struct uvd *uvd);
	int (*setVideoMode)(struct uvd *uvd, struct video_window *vw);
};

struct usbvideo {
	int num_cameras;		/* As allocated */
	struct usb_driver usbdrv;	/* Interface to the USB stack */
	char drvName[80];		/* Driver name */
	struct mutex lock;		/* Mutex protecting camera structures */
	struct usbvideo_cb cb;		/* Table of callbacks (virtual methods) */
	struct video_device vdt;	/* Video device template */
	struct uvd *cam;			/* Array of camera structures */
	struct module *md_module;	/* Minidriver module */
};


/*
 * This macro retrieves callback address from the struct uvd object.
 * No validity checks are done here, so be sure to check the
 * callback beforehand with VALID_CALLBACK.
 */
#define	GET_CALLBACK(uvd,cbName) ((uvd)->handle->cb.cbName)

/*
 * This macro returns either callback pointer or NULL. This is safe
 * macro, meaning that most of components of data structures involved
 * may be NULL - this only results in NULL being returned. You may
 * wish to use this macro to make sure that the callback is callable.
 * However keep in mind that those checks take time.
 */
#define	VALID_CALLBACK(uvd,cbName) ((((uvd) != NULL) && \
		((uvd)->handle != NULL)) ? GET_CALLBACK(uvd,cbName) : NULL)

int  RingQueue_Dequeue(struct RingQueue *rq, unsigned char *dst, int len);
int  RingQueue_Enqueue(struct RingQueue *rq, const unsigned char *cdata, int n);
void RingQueue_WakeUpInterruptible(struct RingQueue *rq);
void RingQueue_Flush(struct RingQueue *rq);

static inline int RingQueue_GetLength(const struct RingQueue *rq)
{
	return (rq->wi - rq->ri + rq->length) & (rq->length-1);
}

static inline int RingQueue_GetFreeSpace(const struct RingQueue *rq)
{
	return rq->length - RingQueue_GetLength(rq);
}

void usbvideo_DrawLine(
	struct usbvideo_frame *frame,
	int x1, int y1,
	int x2, int y2,
	unsigned char cr, unsigned char cg, unsigned char cb);
void usbvideo_HexDump(const unsigned char *data, int len);
void usbvideo_SayAndWait(const char *what);
void usbvideo_TestPattern(struct uvd *uvd, int fullframe, int pmode);

/* Memory allocation routines */
unsigned long usbvideo_kvirt_to_pa(unsigned long adr);

int usbvideo_register(
	struct usbvideo **pCams,
	const int num_cams,
	const int num_extra,
	const char *driverName,
	const struct usbvideo_cb *cbTable,
	struct module *md,
	const struct usb_device_id *id_table);
struct uvd *usbvideo_AllocateDevice(struct usbvideo *cams);
int usbvideo_RegisterVideoDevice(struct uvd *uvd);
void usbvideo_Deregister(struct usbvideo **uvt);

int usbvideo_v4l_initialize(struct video_device *dev);

void usbvideo_DeinterlaceFrame(struct uvd *uvd, struct usbvideo_frame *frame);

/*
 * This code 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.
 *
 * There are two important concepts: frame width, height and
 * V4L canvas width, height. The former is the area requested by
 * the application -for this very frame-. The latter is the largest
 * possible frame that we can serve (we advertise that via V4L ioctl).
 * The frame data is expected to be formatted as lines of length
 * VIDEOSIZE_X(fr->request), total VIDEOSIZE_Y(frame->request) lines.
 */
static inline void RGB24_PUTPIXEL(
	struct usbvideo_frame *fr,
	int ix, int iy,
	unsigned char vr,
	unsigned char vg,
	unsigned char vb)
{
	register unsigned char *pf;
	int limiter = 0, mx, my;
	mx = ix;
	my = iy;
	if (mx < 0) {
		mx=0;
		limiter++;
	} else if (mx >= VIDEOSIZE_X((fr)->request)) {
		mx= VIDEOSIZE_X((fr)->request) - 1;
		limiter++;
	}
	if (my < 0) {
		my = 0;
		limiter++;
	} else if (my >= VIDEOSIZE_Y((fr)->request)) {
		my = VIDEOSIZE_Y((fr)->request) - 1;
		limiter++;
	}
	pf = (fr)->data + V4L_BYTES_PER_PIXEL*((iy)*VIDEOSIZE_X((fr)->request) + (ix));
	if (limiter) {
		*pf++ = 0;
		*pf++ = 0;
		*pf++ = 0xFF;
	} else {
		*pf++ = (vb);
		*pf++ = (vg);
		*pf++ = (vr);
	}
}

#endif /* usbvideo_h */