summaryrefslogtreecommitdiff
path: root/drivers/media/video/ivtv/ivtv-vbi.c
blob: c151bcf5519ae92be2fd189b8f3856f593c04e74 (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
/*
    Vertical Blank Interval support functions
    Copyright (C) 2004-2007  Hans Verkuil <hverkuil@xs4all.nl>

    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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "ivtv-driver.h"
#include "ivtv-i2c.h"
#include "ivtv-ioctl.h"
#include "ivtv-queue.h"
#include "ivtv-vbi.h"

static void ivtv_set_vps(struct ivtv *itv, int enabled)
{
	struct v4l2_sliced_vbi_data data;

	if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
		return;
	data.id = V4L2_SLICED_VPS;
	data.field = 0;
	data.line = enabled ? 16 : 0;
	data.data[2] = itv->vbi.vps_payload.data[0];
	data.data[8] = itv->vbi.vps_payload.data[1];
	data.data[9] = itv->vbi.vps_payload.data[2];
	data.data[10] = itv->vbi.vps_payload.data[3];
	data.data[11] = itv->vbi.vps_payload.data[4];
	ivtv_saa7127(itv, VIDIOC_INT_S_VBI_DATA, &data);
}

static void ivtv_set_cc(struct ivtv *itv, int mode, const struct vbi_cc *cc)
{
	struct v4l2_sliced_vbi_data data;

	if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
		return;
	data.id = V4L2_SLICED_CAPTION_525;
	data.field = 0;
	data.line = (mode & 1) ? 21 : 0;
	data.data[0] = cc->odd[0];
	data.data[1] = cc->odd[1];
	ivtv_saa7127(itv, VIDIOC_INT_S_VBI_DATA, &data);
	data.field = 1;
	data.line = (mode & 2) ? 21 : 0;
	data.data[0] = cc->even[0];
	data.data[1] = cc->even[1];
	ivtv_saa7127(itv, VIDIOC_INT_S_VBI_DATA, &data);
}

static void ivtv_set_wss(struct ivtv *itv, int enabled, int mode)
{
	struct v4l2_sliced_vbi_data data;

	if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
		return;
	/* When using a 50 Hz system, always turn on the
	   wide screen signal with 4x3 ratio as the default.
	   Turning this signal on and off can confuse certain
	   TVs. As far as I can tell there is no reason not to
	   transmit this signal. */
	if ((itv->std & V4L2_STD_625_50) && !enabled) {
		enabled = 1;
		mode = 0x08;  /* 4x3 full format */
	}
	data.id = V4L2_SLICED_WSS_625;
	data.field = 0;
	data.line = enabled ? 23 : 0;
	data.data[0] = mode & 0xff;
	data.data[1] = (mode >> 8) & 0xff;
	ivtv_saa7127(itv, VIDIOC_INT_S_VBI_DATA, &data);
}

static int odd_parity(u8 c)
{
	c ^= (c >> 4);
	c ^= (c >> 2);
	c ^= (c >> 1);

	return c & 1;
}

void ivtv_write_vbi(struct ivtv *itv, const struct v4l2_sliced_vbi_data *sliced, size_t cnt)
{
	struct vbi_info *vi = &itv->vbi;
	struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };
	int found_cc = 0;
	size_t i;

	for (i = 0; i < cnt; i++) {
		const struct v4l2_sliced_vbi_data *d = sliced + i;

		if (d->id == V4L2_SLICED_CAPTION_525 && d->line == 21) {
			if (d->field) {
				cc.even[0] = d->data[0];
				cc.even[1] = d->data[1];
			} else {
				cc.odd[0] = d->data[0];
				cc.odd[1] = d->data[1];
			}
			found_cc = 1;
		}
		else if (d->id == V4L2_SLICED_VPS && d->line == 16 && d->field == 0) {
			struct vbi_vps vps;

			vps.data[0] = d->data[2];
			vps.data[1] = d->data[8];
			vps.data[2] = d->data[9];
			vps.data[3] = d->data[10];
			vps.data[4] = d->data[11];
			if (memcmp(&vps, &vi->vps_payload, sizeof(vps))) {
				vi->vps_payload = vps;
				set_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags);
			}
		}
		else if (d->id == V4L2_SLICED_WSS_625 && d->line == 23 && d->field == 0) {
			int wss = d->data[0] | d->data[1] << 8;

			if (vi->wss_payload != wss) {
				vi->wss_payload = wss;
				set_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags);
			}
		}
	}
	if (found_cc && vi->cc_payload_idx < sizeof(vi->cc_payload)) {
		vi->cc_payload[vi->cc_payload_idx++] = cc;
		set_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
	}
}

static void copy_vbi_data(struct ivtv *itv, int lines, u32 pts_stamp)
{
	int line = 0;
	int i;
	u32 linemask[2] = { 0, 0 };
	unsigned short size;
	static const u8 mpeg_hdr_data[] = {
		0x00, 0x00, 0x01, 0xba, 0x44, 0x00, 0x0c, 0x66,
		0x24, 0x01, 0x01, 0xd1, 0xd3, 0xfa, 0xff, 0xff,
		0x00, 0x00, 0x01, 0xbd, 0x00, 0x1a, 0x84, 0x80,
		0x07, 0x21, 0x00, 0x5d, 0x63, 0xa7, 0xff, 0xff
	};
	const int sd = sizeof(mpeg_hdr_data);	/* start of vbi data */
	int idx = itv->vbi.frame % IVTV_VBI_FRAMES;
	u8 *dst = &itv->vbi.sliced_mpeg_data[idx][0];

	for (i = 0; i < lines; i++) {
		int f, l;

		if (itv->vbi.sliced_data[i].id == 0)
			continue;

		l = itv->vbi.sliced_data[i].line - 6;
		f = itv->vbi.sliced_data[i].field;
		if (f)
			l += 18;
		if (l < 32)
			linemask[0] |= (1 << l);
		else
			linemask[1] |= (1 << (l - 32));
		dst[sd + 12 + line * 43] = service2vbi(itv->vbi.sliced_data[i].id);
		memcpy(dst + sd + 12 + line * 43 + 1, itv->vbi.sliced_data[i].data, 42);
		line++;
	}
	memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data));
	if (line == 36) {
		/* All lines are used, so there is no space for the linemask
		   (the max size of the VBI data is 36 * 43 + 4 bytes).
		   So in this case we use the magic number 'ITV0'. */
		memcpy(dst + sd, "ITV0", 4);
		memcpy(dst + sd + 4, dst + sd + 12, line * 43);
		size = 4 + ((43 * line + 3) & ~3);
	} else {
		memcpy(dst + sd, "itv0", 4);
		memcpy(dst + sd + 4, &linemask[0], 8);
		size = 12 + ((43 * line + 3) & ~3);
	}
	dst[4+16] = (size + 10) >> 8;
	dst[5+16] = (size + 10) & 0xff;
	dst[9+16] = 0x21 | ((pts_stamp >> 29) & 0x6);
	dst[10+16] = (pts_stamp >> 22) & 0xff;
	dst[11+16] = 1 | ((pts_stamp >> 14) & 0xff);
	dst[12+16] = (pts_stamp >> 7) & 0xff;
	dst[13+16] = 1 | ((pts_stamp & 0x7f) << 1);
	itv->vbi.sliced_mpeg_size[idx] = sd + size;
}

static int ivtv_convert_ivtv_vbi(struct ivtv *itv, u8 *p)
{
	u32 linemask[2];
	int i, l, id2;
	int line = 0;

	if (!memcmp(p, "itv0", 4)) {
		memcpy(linemask, p + 4, 8);
		p += 12;
	} else if (!memcmp(p, "ITV0", 4)) {
		linemask[0] = 0xffffffff;
		linemask[1] = 0xf;
		p += 4;
	} else {
		/* unknown VBI data, convert to empty VBI frame */
		linemask[0] = linemask[1] = 0;
	}
	for (i = 0; i < 36; i++) {
		int err = 0;

		if (i < 32 && !(linemask[0] & (1 << i)))
			continue;
		if (i >= 32 && !(linemask[1] & (1 << (i - 32))))
			continue;
		id2 = *p & 0xf;
		switch (id2) {
		case IVTV_SLICED_TYPE_TELETEXT_B:
			id2 = V4L2_SLICED_TELETEXT_B;
			break;
		case IVTV_SLICED_TYPE_CAPTION_525:
			id2 = V4L2_SLICED_CAPTION_525;
			err = !odd_parity(p[1]) || !odd_parity(p[2]);
			break;
		case IVTV_SLICED_TYPE_VPS:
			id2 = V4L2_SLICED_VPS;
			break;
		case IVTV_SLICED_TYPE_WSS_625:
			id2 = V4L2_SLICED_WSS_625;
			break;
		default:
			id2 = 0;
			break;
		}
		if (err == 0) {
			l = (i < 18) ? i + 6 : i - 18 + 6;
			itv->vbi.sliced_dec_data[line].line = l;
			itv->vbi.sliced_dec_data[line].field = i >= 18;
			itv->vbi.sliced_dec_data[line].id = id2;
			memcpy(itv->vbi.sliced_dec_data[line].data, p + 1, 42);
			line++;
		}
		p += 43;
	}
	while (line < 36) {
		itv->vbi.sliced_dec_data[line].id = 0;
		itv->vbi.sliced_dec_data[line].line = 0;
		itv->vbi.sliced_dec_data[line].field = 0;
		line++;
	}
	return line * sizeof(itv->vbi.sliced_dec_data[0]);
}

/* Compress raw VBI format, removes leading SAV codes and surplus space after the
   field.
   Returns new compressed size. */
static u32 compress_raw_buf(struct ivtv *itv, u8 *buf, u32 size)
{
	u32 line_size = itv->vbi.raw_decoder_line_size;
	u32 lines = itv->vbi.count;
	u8 sav1 = itv->vbi.raw_decoder_sav_odd_field;
	u8 sav2 = itv->vbi.raw_decoder_sav_even_field;
	u8 *q = buf;
	u8 *p;
	int i;

	for (i = 0; i < lines; i++) {
		p = buf + i * line_size;

		/* Look for SAV code */
		if (p[0] != 0xff || p[1] || p[2] || (p[3] != sav1 && p[3] != sav2)) {
			break;
		}
		memcpy(q, p + 4, line_size - 4);
		q += line_size - 4;
	}
	return lines * (line_size - 4);
}


/* Compressed VBI format, all found sliced blocks put next to one another
   Returns new compressed size */
static u32 compress_sliced_buf(struct ivtv *itv, u32 line, u8 *buf, u32 size, u8 sav)
{
	u32 line_size = itv->vbi.sliced_decoder_line_size;
	struct v4l2_decode_vbi_line vbi;
	int i;

	/* find the first valid line */
	for (i = 0; i < size; i++, buf++) {
		if (buf[0] == 0xff && !buf[1] && !buf[2] && buf[3] == sav)
			break;
	}

	size -= i;
	if (size < line_size) {
		return line;
	}
	for (i = 0; i < size / line_size; i++) {
		u8 *p = buf + i * line_size;

		/* Look for SAV code  */
		if (p[0] != 0xff || p[1] || p[2] || p[3] != sav) {
			continue;
		}
		vbi.p = p + 4;
		itv->video_dec_func(itv, VIDIOC_INT_DECODE_VBI_LINE, &vbi);
		if (vbi.type) {
			itv->vbi.sliced_data[line].id = vbi.type;
			itv->vbi.sliced_data[line].field = vbi.is_second_field;
			itv->vbi.sliced_data[line].line = vbi.line;
			memcpy(itv->vbi.sliced_data[line].data, vbi.p, 42);
			line++;
		}
	}
	return line;
}

void ivtv_process_vbi_data(struct ivtv *itv, struct ivtv_buffer *buf,
			   u64 pts_stamp, int streamtype)
{
	u8 *p = (u8 *) buf->buf;
	u32 size = buf->bytesused;
	int y;

	/* Raw VBI data */
	if (streamtype == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set == 0) {
		u8 type;

		ivtv_buf_swap(buf);

		type = p[3];

		size = buf->bytesused = compress_raw_buf(itv, p, size);

		/* second field of the frame? */
		if (type == itv->vbi.raw_decoder_sav_even_field) {
			/* Dirty hack needed for backwards
			   compatibility of old VBI software. */
			p += size - 4;
			memcpy(p, &itv->vbi.frame, 4);
			itv->vbi.frame++;
		}
		return;
	}

	/* Sliced VBI data with data insertion */
	if (streamtype == IVTV_ENC_STREAM_TYPE_VBI) {
		int lines;

		ivtv_buf_swap(buf);

		/* first field */
		lines = compress_sliced_buf(itv, 0, p, size / 2,
			itv->vbi.sliced_decoder_sav_odd_field);
		/* second field */
		/* experimentation shows that the second half does not always begin
		   at the exact address. So start a bit earlier (hence 32). */
		lines = compress_sliced_buf(itv, lines, p + size / 2 - 32, size / 2 + 32,
			itv->vbi.sliced_decoder_sav_even_field);
		/* always return at least one empty line */
		if (lines == 0) {
			itv->vbi.sliced_data[0].id = 0;
			itv->vbi.sliced_data[0].line = 0;
			itv->vbi.sliced_data[0].field = 0;
			lines = 1;
		}
		buf->bytesused = size = lines * sizeof(itv->vbi.sliced_data[0]);
		memcpy(p, &itv->vbi.sliced_data[0], size);

		if (itv->vbi.insert_mpeg) {
			copy_vbi_data(itv, lines, pts_stamp);
		}
		itv->vbi.frame++;
		return;
	}

	/* Sliced VBI re-inserted from an MPEG stream */
	if (streamtype == IVTV_DEC_STREAM_TYPE_VBI) {
		/* If the size is not 4-byte aligned, then the starting address
		   for the swapping is also shifted. After swapping the data the
		   real start address of the VBI data is exactly 4 bytes after the
		   original start. It's a bit fiddly but it works like a charm.
		   Non-4-byte alignment happens when an lseek is done on the input
		   mpeg file to a non-4-byte aligned position. So on arrival here
		   the VBI data is also non-4-byte aligned. */
		int offset = size & 3;
		int cnt;

		if (offset) {
			p += 4 - offset;
		}
		/* Swap Buffer */
		for (y = 0; y < size; y += 4) {
		       swab32s((u32 *)(p + y));
		}

		cnt = ivtv_convert_ivtv_vbi(itv, p + offset);
		memcpy(buf->buf, itv->vbi.sliced_dec_data, cnt);
		buf->bytesused = cnt;

		ivtv_write_vbi(itv, itv->vbi.sliced_dec_data,
			       cnt / sizeof(itv->vbi.sliced_dec_data[0]));
		return;
	}
}

void ivtv_disable_cc(struct ivtv *itv)
{
	struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };

	clear_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
	ivtv_set_cc(itv, 0, &cc);
	itv->vbi.cc_payload_idx = 0;
}


void ivtv_vbi_work_handler(struct ivtv *itv)
{
	struct vbi_info *vi = &itv->vbi;
	struct v4l2_sliced_vbi_data data;
	struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };

	/* Lock */
	if (itv->output_mode == OUT_PASSTHROUGH) {
		if (itv->is_50hz) {
			data.id = V4L2_SLICED_WSS_625;
			data.field = 0;

			if (itv->video_dec_func(itv, VIDIOC_INT_G_VBI_DATA, &data) == 0) {
				ivtv_set_wss(itv, 1, data.data[0] & 0xf);
				vi->wss_missing_cnt = 0;
			} else if (vi->wss_missing_cnt == 4) {
				ivtv_set_wss(itv, 1, 0x8);  /* 4x3 full format */
			} else {
				vi->wss_missing_cnt++;
			}
		}
		else {
			int mode = 0;

			data.id = V4L2_SLICED_CAPTION_525;
			data.field = 0;
			if (itv->video_dec_func(itv, VIDIOC_INT_G_VBI_DATA, &data) == 0) {
				mode |= 1;
				cc.odd[0] = data.data[0];
				cc.odd[1] = data.data[1];
			}
			data.field = 1;
			if (itv->video_dec_func(itv, VIDIOC_INT_G_VBI_DATA, &data) == 0) {
				mode |= 2;
				cc.even[0] = data.data[0];
				cc.even[1] = data.data[1];
			}
			if (mode) {
				vi->cc_missing_cnt = 0;
				ivtv_set_cc(itv, mode, &cc);
			} else if (vi->cc_missing_cnt == 4) {
				ivtv_set_cc(itv, 0, &cc);
			} else {
				vi->cc_missing_cnt++;
			}
		}
		return;
	}

	if (test_and_clear_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags)) {
		ivtv_set_wss(itv, 1, vi->wss_payload & 0xf);
	}

	if (test_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags)) {
		if (vi->cc_payload_idx == 0) {
			clear_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
			ivtv_set_cc(itv, 3, &cc);
		}
		while (vi->cc_payload_idx) {
			cc = vi->cc_payload[0];

			memcpy(vi->cc_payload, vi->cc_payload + 1,
					sizeof(vi->cc_payload) - sizeof(vi->cc_payload[0]));
			vi->cc_payload_idx--;
			if (vi->cc_payload_idx && cc.odd[0] == 0x80 && cc.odd[1] == 0x80)
				continue;

			ivtv_set_cc(itv, 3, &cc);
			break;
		}
	}

	if (test_and_clear_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags)) {
		ivtv_set_vps(itv, 1);
	}
}