summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/media/platform/vivid/vivid-kthread-cap.c
blob: 1727f5453f0bb33c77dc5b3fc7422466ced39408 (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
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
/*
 * vivid-kthread-cap.h - video/vbi capture thread support functions.
 *
 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/font.h>
#include <linux/mutex.h>
#include <linux/videodev2.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/random.h>
#include <linux/v4l2-dv-timings.h>
#include <asm/div64.h>
#include <media/videobuf2-vmalloc.h>
#include <media/v4l2-dv-timings.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>

#include "vivid-core.h"
#include "vivid-vid-common.h"
#include "vivid-vid-cap.h"
#include "vivid-vid-out.h"
#include "vivid-radio-common.h"
#include "vivid-radio-rx.h"
#include "vivid-radio-tx.h"
#include "vivid-sdr-cap.h"
#include "vivid-vbi-cap.h"
#include "vivid-vbi-out.h"
#include "vivid-osd.h"
#include "vivid-ctrls.h"
#include "vivid-kthread-cap.h"

static inline v4l2_std_id vivid_get_std_cap(const struct vivid_dev *dev)
{
	if (vivid_is_sdtv_cap(dev))
		return dev->std_cap;
	return 0;
}

static void copy_pix(struct vivid_dev *dev, int win_y, int win_x,
			u16 *cap, const u16 *osd)
{
	u16 out;
	int left = dev->overlay_out_left;
	int top = dev->overlay_out_top;
	int fb_x = win_x + left;
	int fb_y = win_y + top;
	int i;

	out = *cap;
	*cap = *osd;
	if (dev->bitmap_out) {
		const u8 *p = dev->bitmap_out;
		unsigned stride = (dev->compose_out.width + 7) / 8;

		win_x -= dev->compose_out.left;
		win_y -= dev->compose_out.top;
		if (!(p[stride * win_y + win_x / 8] & (1 << (win_x & 7))))
			return;
	}

	for (i = 0; i < dev->clipcount_out; i++) {
		struct v4l2_rect *r = &dev->clips_out[i].c;

		if (fb_y >= r->top && fb_y < r->top + r->height &&
		    fb_x >= r->left && fb_x < r->left + r->width)
			return;
	}
	if ((dev->fbuf_out_flags & V4L2_FBUF_FLAG_CHROMAKEY) &&
	    *osd != dev->chromakey_out)
		return;
	if ((dev->fbuf_out_flags & V4L2_FBUF_FLAG_SRC_CHROMAKEY) &&
	    out == dev->chromakey_out)
		return;
	if (dev->fmt_cap->alpha_mask) {
		if ((dev->fbuf_out_flags & V4L2_FBUF_FLAG_GLOBAL_ALPHA) &&
		    dev->global_alpha_out)
			return;
		if ((dev->fbuf_out_flags & V4L2_FBUF_FLAG_LOCAL_ALPHA) &&
		    *cap & dev->fmt_cap->alpha_mask)
			return;
		if ((dev->fbuf_out_flags & V4L2_FBUF_FLAG_LOCAL_INV_ALPHA) &&
		    !(*cap & dev->fmt_cap->alpha_mask))
			return;
	}
	*cap = out;
}

static void blend_line(struct vivid_dev *dev, unsigned y_offset, unsigned x_offset,
		u8 *vcapbuf, const u8 *vosdbuf,
		unsigned width, unsigned pixsize)
{
	unsigned x;

	for (x = 0; x < width; x++, vcapbuf += pixsize, vosdbuf += pixsize) {
		copy_pix(dev, y_offset, x_offset + x,
			 (u16 *)vcapbuf, (const u16 *)vosdbuf);
	}
}

static void scale_line(const u8 *src, u8 *dst, unsigned srcw, unsigned dstw, unsigned twopixsize)
{
	/* Coarse scaling with Bresenham */
	unsigned int_part;
	unsigned fract_part;
	unsigned src_x = 0;
	unsigned error = 0;
	unsigned x;

	/*
	 * We always combine two pixels to prevent color bleed in the packed
	 * yuv case.
	 */
	srcw /= 2;
	dstw /= 2;
	int_part = srcw / dstw;
	fract_part = srcw % dstw;
	for (x = 0; x < dstw; x++, dst += twopixsize) {
		memcpy(dst, src + src_x * twopixsize, twopixsize);
		src_x += int_part;
		error += fract_part;
		if (error >= dstw) {
			error -= dstw;
			src_x++;
		}
	}
}

/*
 * Precalculate the rectangles needed to perform video looping:
 *
 * The nominal pipeline is that the video output buffer is cropped by
 * crop_out, scaled to compose_out, overlaid with the output overlay,
 * cropped on the capture side by crop_cap and scaled again to the video
 * capture buffer using compose_cap.
 *
 * To keep things efficient we calculate the intersection of compose_out
 * and crop_cap (since that's the only part of the video that will
 * actually end up in the capture buffer), determine which part of the
 * video output buffer that is and which part of the video capture buffer
 * so we can scale the video straight from the output buffer to the capture
 * buffer without any intermediate steps.
 *
 * If we need to deal with an output overlay, then there is no choice and
 * that intermediate step still has to be taken. For the output overlay
 * support we calculate the intersection of the framebuffer and the overlay
 * window (which may be partially or wholly outside of the framebuffer
 * itself) and the intersection of that with loop_vid_copy (i.e. the part of
 * the actual looped video that will be overlaid). The result is calculated
 * both in framebuffer coordinates (loop_fb_copy) and compose_out coordinates
 * (loop_vid_overlay). Finally calculate the part of the capture buffer that
 * will receive that overlaid video.
 */
static void vivid_precalc_copy_rects(struct vivid_dev *dev)
{
	/* Framebuffer rectangle */
	struct v4l2_rect r_fb = {
		0, 0, dev->display_width, dev->display_height
	};
	/* Overlay window rectangle in framebuffer coordinates */
	struct v4l2_rect r_overlay = {
		dev->overlay_out_left, dev->overlay_out_top,
		dev->compose_out.width, dev->compose_out.height
	};

	dev->loop_vid_copy = rect_intersect(&dev->crop_cap, &dev->compose_out);

	dev->loop_vid_out = dev->loop_vid_copy;
	rect_scale(&dev->loop_vid_out, &dev->compose_out, &dev->crop_out);
	dev->loop_vid_out.left += dev->crop_out.left;
	dev->loop_vid_out.top += dev->crop_out.top;

	dev->loop_vid_cap = dev->loop_vid_copy;
	rect_scale(&dev->loop_vid_cap, &dev->crop_cap, &dev->compose_cap);

	dprintk(dev, 1,
		"loop_vid_copy: %dx%d@%dx%d loop_vid_out: %dx%d@%dx%d loop_vid_cap: %dx%d@%dx%d\n",
		dev->loop_vid_copy.width, dev->loop_vid_copy.height,
		dev->loop_vid_copy.left, dev->loop_vid_copy.top,
		dev->loop_vid_out.width, dev->loop_vid_out.height,
		dev->loop_vid_out.left, dev->loop_vid_out.top,
		dev->loop_vid_cap.width, dev->loop_vid_cap.height,
		dev->loop_vid_cap.left, dev->loop_vid_cap.top);

	r_overlay = rect_intersect(&r_fb, &r_overlay);

	/* shift r_overlay to the same origin as compose_out */
	r_overlay.left += dev->compose_out.left - dev->overlay_out_left;
	r_overlay.top += dev->compose_out.top - dev->overlay_out_top;

	dev->loop_vid_overlay = rect_intersect(&r_overlay, &dev->loop_vid_copy);
	dev->loop_fb_copy = dev->loop_vid_overlay;

	/* shift dev->loop_fb_copy back again to the fb origin */
	dev->loop_fb_copy.left -= dev->compose_out.left - dev->overlay_out_left;
	dev->loop_fb_copy.top -= dev->compose_out.top - dev->overlay_out_top;

	dev->loop_vid_overlay_cap = dev->loop_vid_overlay;
	rect_scale(&dev->loop_vid_overlay_cap, &dev->crop_cap, &dev->compose_cap);

	dprintk(dev, 1,
		"loop_fb_copy: %dx%d@%dx%d loop_vid_overlay: %dx%d@%dx%d loop_vid_overlay_cap: %dx%d@%dx%d\n",
		dev->loop_fb_copy.width, dev->loop_fb_copy.height,
		dev->loop_fb_copy.left, dev->loop_fb_copy.top,
		dev->loop_vid_overlay.width, dev->loop_vid_overlay.height,
		dev->loop_vid_overlay.left, dev->loop_vid_overlay.top,
		dev->loop_vid_overlay_cap.width, dev->loop_vid_overlay_cap.height,
		dev->loop_vid_overlay_cap.left, dev->loop_vid_overlay_cap.top);
}

static void *plane_vaddr(struct tpg_data *tpg, struct vivid_buffer *buf,
			 unsigned p, unsigned bpl[TPG_MAX_PLANES], unsigned h)
{
	unsigned i;
	void *vbuf;

	if (p == 0 || tpg_g_buffers(tpg) > 1)
		return vb2_plane_vaddr(&buf->vb, p);
	vbuf = vb2_plane_vaddr(&buf->vb, 0);
	for (i = 0; i < p; i++)
		vbuf += bpl[i] * h / tpg->vdownsampling[i];
	return vbuf;
}

static int vivid_copy_buffer(struct vivid_dev *dev, unsigned p, u8 *vcapbuf,
		struct vivid_buffer *vid_cap_buf)
{
	bool blank = dev->must_blank[vid_cap_buf->vb.v4l2_buf.index];
	struct tpg_data *tpg = &dev->tpg;
	struct vivid_buffer *vid_out_buf = NULL;
	unsigned vdiv = dev->fmt_out->vdownsampling[p];
	unsigned twopixsize = tpg_g_twopixelsize(tpg, p);
	unsigned img_width = tpg_hdiv(tpg, p, dev->compose_cap.width);
	unsigned img_height = dev->compose_cap.height;
	unsigned stride_cap = tpg->bytesperline[p];
	unsigned stride_out = dev->bytesperline_out[p];
	unsigned stride_osd = dev->display_byte_stride;
	unsigned hmax = (img_height * tpg->perc_fill) / 100;
	u8 *voutbuf;
	u8 *vosdbuf = NULL;
	unsigned y;
	bool blend = dev->bitmap_out || dev->clipcount_out || dev->fbuf_out_flags;
	/* Coarse scaling with Bresenham */
	unsigned vid_out_int_part;
	unsigned vid_out_fract_part;
	unsigned vid_out_y = 0;
	unsigned vid_out_error = 0;
	unsigned vid_overlay_int_part = 0;
	unsigned vid_overlay_fract_part = 0;
	unsigned vid_overlay_y = 0;
	unsigned vid_overlay_error = 0;
	unsigned vid_cap_left = tpg_hdiv(tpg, p, dev->loop_vid_cap.left);
	unsigned vid_cap_right;
	bool quick;

	vid_out_int_part = dev->loop_vid_out.height / dev->loop_vid_cap.height;
	vid_out_fract_part = dev->loop_vid_out.height % dev->loop_vid_cap.height;

	if (!list_empty(&dev->vid_out_active))
		vid_out_buf = list_entry(dev->vid_out_active.next,
					 struct vivid_buffer, list);
	if (vid_out_buf == NULL)
		return -ENODATA;

	vid_cap_buf->vb.v4l2_buf.field = vid_out_buf->vb.v4l2_buf.field;

	voutbuf = plane_vaddr(tpg, vid_out_buf, p,
			      dev->bytesperline_out, dev->fmt_out_rect.height);
	if (p < dev->fmt_out->buffers)
		voutbuf += vid_out_buf->vb.v4l2_planes[p].data_offset;
	voutbuf += tpg_hdiv(tpg, p, dev->loop_vid_out.left) +
		(dev->loop_vid_out.top / vdiv) * stride_out;
	vcapbuf += tpg_hdiv(tpg, p, dev->compose_cap.left) +
		(dev->compose_cap.top / vdiv) * stride_cap;

	if (dev->loop_vid_copy.width == 0 || dev->loop_vid_copy.height == 0) {
		/*
		 * If there is nothing to copy, then just fill the capture window
		 * with black.
		 */
		for (y = 0; y < hmax / vdiv; y++, vcapbuf += stride_cap)
			memcpy(vcapbuf, tpg->black_line[p], img_width);
		return 0;
	}

	if (dev->overlay_out_enabled &&
	    dev->loop_vid_overlay.width && dev->loop_vid_overlay.height) {
		vosdbuf = dev->video_vbase;
		vosdbuf += (dev->loop_fb_copy.left * twopixsize) / 2 +
			   dev->loop_fb_copy.top * stride_osd;
		vid_overlay_int_part = dev->loop_vid_overlay.height /
				       dev->loop_vid_overlay_cap.height;
		vid_overlay_fract_part = dev->loop_vid_overlay.height %
					 dev->loop_vid_overlay_cap.height;
	}

	vid_cap_right = tpg_hdiv(tpg, p, dev->loop_vid_cap.left + dev->loop_vid_cap.width);
	/* quick is true if no video scaling is needed */
	quick = dev->loop_vid_out.width == dev->loop_vid_cap.width;

	dev->cur_scaled_line = dev->loop_vid_out.height;
	for (y = 0; y < hmax; y += vdiv, vcapbuf += stride_cap) {
		/* osdline is true if this line requires overlay blending */
		bool osdline = vosdbuf && y >= dev->loop_vid_overlay_cap.top &&
			  y < dev->loop_vid_overlay_cap.top + dev->loop_vid_overlay_cap.height;

		/*
		 * If this line of the capture buffer doesn't get any video, then
		 * just fill with black.
		 */
		if (y < dev->loop_vid_cap.top ||
		    y >= dev->loop_vid_cap.top + dev->loop_vid_cap.height) {
			memcpy(vcapbuf, tpg->black_line[p], img_width);
			continue;
		}

		/* fill the left border with black */
		if (dev->loop_vid_cap.left)
			memcpy(vcapbuf, tpg->black_line[p], vid_cap_left);

		/* fill the right border with black */
		if (vid_cap_right < img_width)
			memcpy(vcapbuf + vid_cap_right, tpg->black_line[p],
				img_width - vid_cap_right);

		if (quick && !osdline) {
			memcpy(vcapbuf + vid_cap_left,
			       voutbuf + vid_out_y * stride_out,
			       tpg_hdiv(tpg, p, dev->loop_vid_cap.width));
			goto update_vid_out_y;
		}
		if (dev->cur_scaled_line == vid_out_y) {
			memcpy(vcapbuf + vid_cap_left, dev->scaled_line,
			       tpg_hdiv(tpg, p, dev->loop_vid_cap.width));
			goto update_vid_out_y;
		}
		if (!osdline) {
			scale_line(voutbuf + vid_out_y * stride_out, dev->scaled_line,
				tpg_hdiv(tpg, p, dev->loop_vid_out.width),
				tpg_hdiv(tpg, p, dev->loop_vid_cap.width),
				tpg_g_twopixelsize(tpg, p));
		} else {
			/*
			 * Offset in bytes within loop_vid_copy to the start of the
			 * loop_vid_overlay rectangle.
			 */
			unsigned offset =
				((dev->loop_vid_overlay.left - dev->loop_vid_copy.left) *
				 twopixsize) / 2;
			u8 *osd = vosdbuf + vid_overlay_y * stride_osd;

			scale_line(voutbuf + vid_out_y * stride_out, dev->blended_line,
				dev->loop_vid_out.width, dev->loop_vid_copy.width,
				tpg_g_twopixelsize(tpg, p));
			if (blend)
				blend_line(dev, vid_overlay_y + dev->loop_vid_overlay.top,
					   dev->loop_vid_overlay.left,
					   dev->blended_line + offset, osd,
					   dev->loop_vid_overlay.width, twopixsize / 2);
			else
				memcpy(dev->blended_line + offset,
				       osd, (dev->loop_vid_overlay.width * twopixsize) / 2);
			scale_line(dev->blended_line, dev->scaled_line,
					dev->loop_vid_copy.width, dev->loop_vid_cap.width,
					tpg_g_twopixelsize(tpg, p));
		}
		dev->cur_scaled_line = vid_out_y;
		memcpy(vcapbuf + vid_cap_left, dev->scaled_line,
		       tpg_hdiv(tpg, p, dev->loop_vid_cap.width));

update_vid_out_y:
		if (osdline) {
			vid_overlay_y += vid_overlay_int_part;
			vid_overlay_error += vid_overlay_fract_part;
			if (vid_overlay_error >= dev->loop_vid_overlay_cap.height) {
				vid_overlay_error -= dev->loop_vid_overlay_cap.height;
				vid_overlay_y++;
			}
		}
		vid_out_y += vid_out_int_part;
		vid_out_error += vid_out_fract_part;
		if (vid_out_error >= dev->loop_vid_cap.height / vdiv) {
			vid_out_error -= dev->loop_vid_cap.height / vdiv;
			vid_out_y++;
		}
	}

	if (!blank)
		return 0;
	for (; y < img_height; y += vdiv, vcapbuf += stride_cap)
		memcpy(vcapbuf, tpg->contrast_line[p], img_width);
	return 0;
}

static void vivid_fillbuff(struct vivid_dev *dev, struct vivid_buffer *buf)
{
	struct tpg_data *tpg = &dev->tpg;
	unsigned factor = V4L2_FIELD_HAS_T_OR_B(dev->field_cap) ? 2 : 1;
	unsigned line_height = 16 / factor;
	bool is_tv = vivid_is_sdtv_cap(dev);
	bool is_60hz = is_tv && (dev->std_cap & V4L2_STD_525_60);
	unsigned p;
	int line = 1;
	u8 *basep[TPG_MAX_PLANES][2];
	unsigned ms;
	char str[100];
	s32 gain;
	bool is_loop = false;

	if (dev->loop_video && dev->can_loop_video &&
	    ((vivid_is_svid_cap(dev) && !VIVID_INVALID_SIGNAL(dev->std_signal_mode)) ||
	     (vivid_is_hdmi_cap(dev) && !VIVID_INVALID_SIGNAL(dev->dv_timings_signal_mode))))
		is_loop = true;

	buf->vb.v4l2_buf.sequence = dev->vid_cap_seq_count;
	/*
	 * Take the timestamp now if the timestamp source is set to
	 * "Start of Exposure".
	 */
	if (dev->tstamp_src_is_soe)
		v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
	if (dev->field_cap == V4L2_FIELD_ALTERNATE) {
		/*
		 * 60 Hz standards start with the bottom field, 50 Hz standards
		 * with the top field. So if the 0-based seq_count is even,
		 * then the field is TOP for 50 Hz and BOTTOM for 60 Hz
		 * standards.
		 */
		buf->vb.v4l2_buf.field = ((dev->vid_cap_seq_count & 1) ^ is_60hz) ?
			V4L2_FIELD_BOTTOM : V4L2_FIELD_TOP;
		/*
		 * The sequence counter counts frames, not fields. So divide
		 * by two.
		 */
		buf->vb.v4l2_buf.sequence /= 2;
	} else {
		buf->vb.v4l2_buf.field = dev->field_cap;
	}
	tpg_s_field(tpg, buf->vb.v4l2_buf.field,
		    dev->field_cap == V4L2_FIELD_ALTERNATE);
	tpg_s_perc_fill_blank(tpg, dev->must_blank[buf->vb.v4l2_buf.index]);

	vivid_precalc_copy_rects(dev);

	for (p = 0; p < tpg_g_planes(tpg); p++) {
		void *vbuf = plane_vaddr(tpg, buf, p,
					 tpg->bytesperline, tpg->buf_height);

		/*
		 * The first plane of a multiplanar format has a non-zero
		 * data_offset. This helps testing whether the application
		 * correctly supports non-zero data offsets.
		 */
		if (p < tpg_g_buffers(tpg) && dev->fmt_cap->data_offset[p]) {
			memset(vbuf, dev->fmt_cap->data_offset[p] & 0xff,
			       dev->fmt_cap->data_offset[p]);
			vbuf += dev->fmt_cap->data_offset[p];
		}
		tpg_calc_text_basep(tpg, basep, p, vbuf);
		if (!is_loop || vivid_copy_buffer(dev, p, vbuf, buf))
			tpg_fill_plane_buffer(tpg, vivid_get_std_cap(dev), p, vbuf);
	}
	dev->must_blank[buf->vb.v4l2_buf.index] = false;

	/* Updates stream time, only update at the start of a new frame. */
	if (dev->field_cap != V4L2_FIELD_ALTERNATE || (buf->vb.v4l2_buf.sequence & 1) == 0)
		dev->ms_vid_cap = jiffies_to_msecs(jiffies - dev->jiffies_vid_cap);

	ms = dev->ms_vid_cap;
	if (dev->osd_mode <= 1) {
		snprintf(str, sizeof(str), " %02d:%02d:%02d:%03d %u%s",
				(ms / (60 * 60 * 1000)) % 24,
				(ms / (60 * 1000)) % 60,
				(ms / 1000) % 60,
				ms % 1000,
				buf->vb.v4l2_buf.sequence,
				(dev->field_cap == V4L2_FIELD_ALTERNATE) ?
					(buf->vb.v4l2_buf.field == V4L2_FIELD_TOP ?
					 " top" : " bottom") : "");
		tpg_gen_text(tpg, basep, line++ * line_height, 16, str);
	}
	if (dev->osd_mode == 0) {
		snprintf(str, sizeof(str), " %dx%d, input %d ",
				dev->src_rect.width, dev->src_rect.height, dev->input);
		tpg_gen_text(tpg, basep, line++ * line_height, 16, str);

		gain = v4l2_ctrl_g_ctrl(dev->gain);
		mutex_lock(dev->ctrl_hdl_user_vid.lock);
		snprintf(str, sizeof(str),
			" brightness %3d, contrast %3d, saturation %3d, hue %d ",
			dev->brightness->cur.val,
			dev->contrast->cur.val,
			dev->saturation->cur.val,
			dev->hue->cur.val);
		tpg_gen_text(tpg, basep, line++ * line_height, 16, str);
		snprintf(str, sizeof(str),
			" autogain %d, gain %3d, alpha 0x%02x ",
			dev->autogain->cur.val, gain, dev->alpha->cur.val);
		mutex_unlock(dev->ctrl_hdl_user_vid.lock);
		tpg_gen_text(tpg, basep, line++ * line_height, 16, str);
		mutex_lock(dev->ctrl_hdl_user_aud.lock);
		snprintf(str, sizeof(str),
			" volume %3d, mute %d ",
			dev->volume->cur.val, dev->mute->cur.val);
		mutex_unlock(dev->ctrl_hdl_user_aud.lock);
		tpg_gen_text(tpg, basep, line++ * line_height, 16, str);
		mutex_lock(dev->ctrl_hdl_user_gen.lock);
		snprintf(str, sizeof(str), " int32 %d, int64 %lld, bitmask %08x ",
			dev->int32->cur.val,
			*dev->int64->p_cur.p_s64,
			dev->bitmask->cur.val);
		tpg_gen_text(tpg, basep, line++ * line_height, 16, str);
		snprintf(str, sizeof(str), " boolean %d, menu %s, string \"%s\" ",
			dev->boolean->cur.val,
			dev->menu->qmenu[dev->menu->cur.val],
			dev->string->p_cur.p_char);
		tpg_gen_text(tpg, basep, line++ * line_height, 16, str);
		snprintf(str, sizeof(str), " integer_menu %lld, value %d ",
			dev->int_menu->qmenu_int[dev->int_menu->cur.val],
			dev->int_menu->cur.val);
		mutex_unlock(dev->ctrl_hdl_user_gen.lock);
		tpg_gen_text(tpg, basep, line++ * line_height, 16, str);
		if (dev->button_pressed) {
			dev->button_pressed--;
			snprintf(str, sizeof(str), " button pressed!");
			tpg_gen_text(tpg, basep, line++ * line_height, 16, str);
		}
	}

	/*
	 * If "End of Frame" is specified at the timestamp source, then take
	 * the timestamp now.
	 */
	if (!dev->tstamp_src_is_soe)
		v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
	buf->vb.v4l2_buf.timestamp.tv_sec += dev->time_wrap_offset;
}

/*
 * Return true if this pixel coordinate is a valid video pixel.
 */
static bool valid_pix(struct vivid_dev *dev, int win_y, int win_x, int fb_y, int fb_x)
{
	int i;

	if (dev->bitmap_cap) {
		/*
		 * Only if the corresponding bit in the bitmap is set can
		 * the video pixel be shown. Coordinates are relative to
		 * the overlay window set by VIDIOC_S_FMT.
		 */
		const u8 *p = dev->bitmap_cap;
		unsigned stride = (dev->compose_cap.width + 7) / 8;

		if (!(p[stride * win_y + win_x / 8] & (1 << (win_x & 7))))
			return false;
	}

	for (i = 0; i < dev->clipcount_cap; i++) {
		/*
		 * Only if the framebuffer coordinate is not in any of the
		 * clip rectangles will be video pixel be shown.
		 */
		struct v4l2_rect *r = &dev->clips_cap[i].c;

		if (fb_y >= r->top && fb_y < r->top + r->height &&
		    fb_x >= r->left && fb_x < r->left + r->width)
			return false;
	}
	return true;
}

/*
 * Draw the image into the overlay buffer.
 * Note that the combination of overlay and multiplanar is not supported.
 */
static void vivid_overlay(struct vivid_dev *dev, struct vivid_buffer *buf)
{
	struct tpg_data *tpg = &dev->tpg;
	unsigned pixsize = tpg_g_twopixelsize(tpg, 0) / 2;
	void *vbase = dev->fb_vbase_cap;
	void *vbuf = vb2_plane_vaddr(&buf->vb, 0);
	unsigned img_width = dev->compose_cap.width;
	unsigned img_height = dev->compose_cap.height;
	unsigned stride = tpg->bytesperline[0];
	/* if quick is true, then valid_pix() doesn't have to be called */
	bool quick = dev->bitmap_cap == NULL && dev->clipcount_cap == 0;
	int x, y, w, out_x = 0;

	/*
	 * Overlay support is only supported for formats that have a twopixelsize
	 * that's >= 2. Warn and bail out if that's not the case.
	 */
	if (WARN_ON(pixsize == 0))
		return;
	if ((dev->overlay_cap_field == V4L2_FIELD_TOP ||
	     dev->overlay_cap_field == V4L2_FIELD_BOTTOM) &&
	    dev->overlay_cap_field != buf->vb.v4l2_buf.field)
		return;

	vbuf += dev->compose_cap.left * pixsize + dev->compose_cap.top * stride;
	x = dev->overlay_cap_left;
	w = img_width;
	if (x < 0) {
		out_x = -x;
		w = w - out_x;
		x = 0;
	} else {
		w = dev->fb_cap.fmt.width - x;
		if (w > img_width)
			w = img_width;
	}
	if (w <= 0)
		return;
	if (dev->overlay_cap_top >= 0)
		vbase += dev->overlay_cap_top * dev->fb_cap.fmt.bytesperline;
	for (y = dev->overlay_cap_top;
	     y < dev->overlay_cap_top + (int)img_height;
	     y++, vbuf += stride) {
		int px;

		if (y < 0 || y > dev->fb_cap.fmt.height)
			continue;
		if (quick) {
			memcpy(vbase + x * pixsize,
			       vbuf + out_x * pixsize, w * pixsize);
			vbase += dev->fb_cap.fmt.bytesperline;
			continue;
		}
		for (px = 0; px < w; px++) {
			if (!valid_pix(dev, y - dev->overlay_cap_top,
				       px + out_x, y, px + x))
				continue;
			memcpy(vbase + (px + x) * pixsize,
			       vbuf + (px + out_x) * pixsize,
			       pixsize);
		}
		vbase += dev->fb_cap.fmt.bytesperline;
	}
}

static void vivid_thread_vid_cap_tick(struct vivid_dev *dev, int dropped_bufs)
{
	struct vivid_buffer *vid_cap_buf = NULL;
	struct vivid_buffer *vbi_cap_buf = NULL;

	dprintk(dev, 1, "Video Capture Thread Tick\n");

	while (dropped_bufs-- > 1)
		tpg_update_mv_count(&dev->tpg,
				dev->field_cap == V4L2_FIELD_NONE ||
				dev->field_cap == V4L2_FIELD_ALTERNATE);

	/* Drop a certain percentage of buffers. */
	if (dev->perc_dropped_buffers &&
	    prandom_u32_max(100) < dev->perc_dropped_buffers)
		goto update_mv;

	spin_lock(&dev->slock);
	if (!list_empty(&dev->vid_cap_active)) {
		vid_cap_buf = list_entry(dev->vid_cap_active.next, struct vivid_buffer, list);
		list_del(&vid_cap_buf->list);
	}
	if (!list_empty(&dev->vbi_cap_active)) {
		if (dev->field_cap != V4L2_FIELD_ALTERNATE ||
		    (dev->vbi_cap_seq_count & 1)) {
			vbi_cap_buf = list_entry(dev->vbi_cap_active.next,
						 struct vivid_buffer, list);
			list_del(&vbi_cap_buf->list);
		}
	}
	spin_unlock(&dev->slock);

	if (!vid_cap_buf && !vbi_cap_buf)
		goto update_mv;

	if (vid_cap_buf) {
		/* Fill buffer */
		vivid_fillbuff(dev, vid_cap_buf);
		dprintk(dev, 1, "filled buffer %d\n",
			vid_cap_buf->vb.v4l2_buf.index);

		/* Handle overlay */
		if (dev->overlay_cap_owner && dev->fb_cap.base &&
				dev->fb_cap.fmt.pixelformat == dev->fmt_cap->fourcc)
			vivid_overlay(dev, vid_cap_buf);

		vb2_buffer_done(&vid_cap_buf->vb, dev->dqbuf_error ?
				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
		dprintk(dev, 2, "vid_cap buffer %d done\n",
				vid_cap_buf->vb.v4l2_buf.index);
	}

	if (vbi_cap_buf) {
		if (dev->stream_sliced_vbi_cap)
			vivid_sliced_vbi_cap_process(dev, vbi_cap_buf);
		else
			vivid_raw_vbi_cap_process(dev, vbi_cap_buf);
		vb2_buffer_done(&vbi_cap_buf->vb, dev->dqbuf_error ?
				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
		dprintk(dev, 2, "vbi_cap %d done\n",
				vbi_cap_buf->vb.v4l2_buf.index);
	}
	dev->dqbuf_error = false;

update_mv:
	/* Update the test pattern movement counters */
	tpg_update_mv_count(&dev->tpg, dev->field_cap == V4L2_FIELD_NONE ||
				       dev->field_cap == V4L2_FIELD_ALTERNATE);
}

static int vivid_thread_vid_cap(void *data)
{
	struct vivid_dev *dev = data;
	u64 numerators_since_start;
	u64 buffers_since_start;
	u64 next_jiffies_since_start;
	unsigned long jiffies_since_start;
	unsigned long cur_jiffies;
	unsigned wait_jiffies;
	unsigned numerator;
	unsigned denominator;
	int dropped_bufs;

	dprintk(dev, 1, "Video Capture Thread Start\n");

	set_freezable();

	/* Resets frame counters */
	dev->cap_seq_offset = 0;
	dev->cap_seq_count = 0;
	dev->cap_seq_resync = false;
	dev->jiffies_vid_cap = jiffies;

	for (;;) {
		try_to_freeze();
		if (kthread_should_stop())
			break;

		mutex_lock(&dev->mutex);
		cur_jiffies = jiffies;
		if (dev->cap_seq_resync) {
			dev->jiffies_vid_cap = cur_jiffies;
			dev->cap_seq_offset = dev->cap_seq_count + 1;
			dev->cap_seq_count = 0;
			dev->cap_seq_resync = false;
		}
		numerator = dev->timeperframe_vid_cap.numerator;
		denominator = dev->timeperframe_vid_cap.denominator;

		if (dev->field_cap == V4L2_FIELD_ALTERNATE)
			denominator *= 2;

		/* Calculate the number of jiffies since we started streaming */
		jiffies_since_start = cur_jiffies - dev->jiffies_vid_cap;
		/* Get the number of buffers streamed since the start */
		buffers_since_start = (u64)jiffies_since_start * denominator +
				      (HZ * numerator) / 2;
		do_div(buffers_since_start, HZ * numerator);

		/*
		 * After more than 0xf0000000 (rounded down to a multiple of
		 * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
		 * jiffies have passed since we started streaming reset the
		 * counters and keep track of the sequence offset.
		 */
		if (jiffies_since_start > JIFFIES_RESYNC) {
			dev->jiffies_vid_cap = cur_jiffies;
			dev->cap_seq_offset = buffers_since_start;
			buffers_since_start = 0;
		}
		dropped_bufs = buffers_since_start + dev->cap_seq_offset - dev->cap_seq_count;
		dev->cap_seq_count = buffers_since_start + dev->cap_seq_offset;
		dev->vid_cap_seq_count = dev->cap_seq_count - dev->vid_cap_seq_start;
		dev->vbi_cap_seq_count = dev->cap_seq_count - dev->vbi_cap_seq_start;

		vivid_thread_vid_cap_tick(dev, dropped_bufs);

		/*
		 * Calculate the number of 'numerators' streamed since we started,
		 * including the current buffer.
		 */
		numerators_since_start = ++buffers_since_start * numerator;

		/* And the number of jiffies since we started */
		jiffies_since_start = jiffies - dev->jiffies_vid_cap;

		mutex_unlock(&dev->mutex);

		/*
		 * Calculate when that next buffer is supposed to start
		 * in jiffies since we started streaming.
		 */
		next_jiffies_since_start = numerators_since_start * HZ +
					   denominator / 2;
		do_div(next_jiffies_since_start, denominator);
		/* If it is in the past, then just schedule asap */
		if (next_jiffies_since_start < jiffies_since_start)
			next_jiffies_since_start = jiffies_since_start;

		wait_jiffies = next_jiffies_since_start - jiffies_since_start;
		schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
	}
	dprintk(dev, 1, "Video Capture Thread End\n");
	return 0;
}

static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
{
	v4l2_ctrl_grab(dev->ctrl_has_crop_cap, grab);
	v4l2_ctrl_grab(dev->ctrl_has_compose_cap, grab);
	v4l2_ctrl_grab(dev->ctrl_has_scaler_cap, grab);
}

int vivid_start_generating_vid_cap(struct vivid_dev *dev, bool *pstreaming)
{
	dprintk(dev, 1, "%s\n", __func__);

	if (dev->kthread_vid_cap) {
		u32 seq_count = dev->cap_seq_count + dev->seq_wrap * 128;

		if (pstreaming == &dev->vid_cap_streaming)
			dev->vid_cap_seq_start = seq_count;
		else
			dev->vbi_cap_seq_start = seq_count;
		*pstreaming = true;
		return 0;
	}

	/* Resets frame counters */
	tpg_init_mv_count(&dev->tpg);

	dev->vid_cap_seq_start = dev->seq_wrap * 128;
	dev->vbi_cap_seq_start = dev->seq_wrap * 128;

	dev->kthread_vid_cap = kthread_run(vivid_thread_vid_cap, dev,
			"%s-vid-cap", dev->v4l2_dev.name);

	if (IS_ERR(dev->kthread_vid_cap)) {
		v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
		return PTR_ERR(dev->kthread_vid_cap);
	}
	*pstreaming = true;
	vivid_grab_controls(dev, true);

	dprintk(dev, 1, "returning from %s\n", __func__);
	return 0;
}

void vivid_stop_generating_vid_cap(struct vivid_dev *dev, bool *pstreaming)
{
	dprintk(dev, 1, "%s\n", __func__);

	if (dev->kthread_vid_cap == NULL)
		return;

	*pstreaming = false;
	if (pstreaming == &dev->vid_cap_streaming) {
		/* Release all active buffers */
		while (!list_empty(&dev->vid_cap_active)) {
			struct vivid_buffer *buf;

			buf = list_entry(dev->vid_cap_active.next,
					 struct vivid_buffer, list);
			list_del(&buf->list);
			vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
			dprintk(dev, 2, "vid_cap buffer %d done\n",
				buf->vb.v4l2_buf.index);
		}
	}

	if (pstreaming == &dev->vbi_cap_streaming) {
		while (!list_empty(&dev->vbi_cap_active)) {
			struct vivid_buffer *buf;

			buf = list_entry(dev->vbi_cap_active.next,
					 struct vivid_buffer, list);
			list_del(&buf->list);
			vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
			dprintk(dev, 2, "vbi_cap buffer %d done\n",
				buf->vb.v4l2_buf.index);
		}
	}

	if (dev->vid_cap_streaming || dev->vbi_cap_streaming)
		return;

	/* shutdown control thread */
	vivid_grab_controls(dev, false);
	mutex_unlock(&dev->mutex);
	kthread_stop(dev->kthread_vid_cap);
	dev->kthread_vid_cap = NULL;
	mutex_lock(&dev->mutex);
}