1 /*
2 * cx18 ADEC VBI functions
3 *
4 * Derived from cx25840-vbi.c
5 *
6 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 * 02110-1301, USA.
22 */
23
24
25 #include "cx18-driver.h"
26
odd_parity(u8 c)27 static int odd_parity(u8 c)
28 {
29 c ^= (c >> 4);
30 c ^= (c >> 2);
31 c ^= (c >> 1);
32
33 return c & 1;
34 }
35
decode_vps(u8 * dst,u8 * p)36 static int decode_vps(u8 *dst, u8 *p)
37 {
38 static const u8 biphase_tbl[] = {
39 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
40 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
41 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
42 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
43 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
44 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
45 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
46 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
47 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
48 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
49 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
50 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
51 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
52 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
53 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
54 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
55 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
56 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
57 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
58 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
59 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
60 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
61 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
62 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
63 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
64 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
65 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
66 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
67 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
68 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
69 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
70 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
71 };
72
73 u8 c, err = 0;
74 int i;
75
76 for (i = 0; i < 2 * 13; i += 2) {
77 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
78 c = (biphase_tbl[p[i + 1]] & 0xf) |
79 ((biphase_tbl[p[i]] & 0xf) << 4);
80 dst[i / 2] = c;
81 }
82
83 return err & 0xf0;
84 }
85
cx18_av_vbi(struct cx18 * cx,unsigned int cmd,void * arg)86 int cx18_av_vbi(struct cx18 *cx, unsigned int cmd, void *arg)
87 {
88 struct cx18_av_state *state = &cx->av_state;
89 struct v4l2_format *fmt;
90 struct v4l2_sliced_vbi_format *svbi;
91
92 switch (cmd) {
93 case VIDIOC_G_FMT:
94 {
95 static u16 lcr2vbi[] = {
96 0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */
97 0, V4L2_SLICED_WSS_625, 0, /* 4 */
98 V4L2_SLICED_CAPTION_525, /* 6 */
99 0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */
100 0, 0, 0, 0
101 };
102 int is_pal = !(state->std & V4L2_STD_525_60);
103 int i;
104
105 fmt = arg;
106 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
107 return -EINVAL;
108 svbi = &fmt->fmt.sliced;
109 memset(svbi, 0, sizeof(*svbi));
110 /* we're done if raw VBI is active */
111 if ((cx18_av_read(cx, 0x404) & 0x10) == 0)
112 break;
113
114 if (is_pal) {
115 for (i = 7; i <= 23; i++) {
116 u8 v = cx18_av_read(cx, 0x424 + i - 7);
117
118 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
119 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
120 svbi->service_set |= svbi->service_lines[0][i] |
121 svbi->service_lines[1][i];
122 }
123 } else {
124 for (i = 10; i <= 21; i++) {
125 u8 v = cx18_av_read(cx, 0x424 + i - 10);
126
127 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
128 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
129 svbi->service_set |= svbi->service_lines[0][i] |
130 svbi->service_lines[1][i];
131 }
132 }
133 break;
134 }
135
136 case VIDIOC_S_FMT:
137 {
138 int is_pal = !(state->std & V4L2_STD_525_60);
139 int vbi_offset = is_pal ? 1 : 0;
140 int i, x;
141 u8 lcr[24];
142
143 fmt = arg;
144 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE &&
145 fmt->type != V4L2_BUF_TYPE_VBI_CAPTURE)
146 return -EINVAL;
147 svbi = &fmt->fmt.sliced;
148 if (fmt->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
149 /* raw VBI */
150 memset(svbi, 0, sizeof(*svbi));
151
152 /* Setup standard */
153 cx18_av_std_setup(cx);
154
155 /* VBI Offset */
156 cx18_av_write(cx, 0x47f, vbi_offset);
157 cx18_av_write(cx, 0x404, 0x2e);
158 break;
159 }
160
161 for (x = 0; x <= 23; x++)
162 lcr[x] = 0x00;
163
164 /* Setup standard */
165 cx18_av_std_setup(cx);
166
167 /* Sliced VBI */
168 cx18_av_write(cx, 0x404, 0x32); /* Ancillary data */
169 cx18_av_write(cx, 0x406, 0x13);
170 cx18_av_write(cx, 0x47f, vbi_offset);
171
172 if (is_pal) {
173 for (i = 0; i <= 6; i++)
174 svbi->service_lines[0][i] =
175 svbi->service_lines[1][i] = 0;
176 } else {
177 for (i = 0; i <= 9; i++)
178 svbi->service_lines[0][i] =
179 svbi->service_lines[1][i] = 0;
180
181 for (i = 22; i <= 23; i++)
182 svbi->service_lines[0][i] =
183 svbi->service_lines[1][i] = 0;
184 }
185
186 for (i = 7; i <= 23; i++) {
187 for (x = 0; x <= 1; x++) {
188 switch (svbi->service_lines[1-x][i]) {
189 case V4L2_SLICED_TELETEXT_B:
190 lcr[i] |= 1 << (4 * x);
191 break;
192 case V4L2_SLICED_WSS_625:
193 lcr[i] |= 4 << (4 * x);
194 break;
195 case V4L2_SLICED_CAPTION_525:
196 lcr[i] |= 6 << (4 * x);
197 break;
198 case V4L2_SLICED_VPS:
199 lcr[i] |= 9 << (4 * x);
200 break;
201 }
202 }
203 }
204
205 if (is_pal) {
206 for (x = 1, i = 0x424; i <= 0x434; i++, x++)
207 cx18_av_write(cx, i, lcr[6 + x]);
208 } else {
209 for (x = 1, i = 0x424; i <= 0x430; i++, x++)
210 cx18_av_write(cx, i, lcr[9 + x]);
211 for (i = 0x431; i <= 0x434; i++)
212 cx18_av_write(cx, i, 0);
213 }
214
215 cx18_av_write(cx, 0x43c, 0x16);
216 cx18_av_write(cx, 0x474, is_pal ? 0x2a : 0x22);
217 break;
218 }
219
220 case VIDIOC_INT_DECODE_VBI_LINE:
221 {
222 struct v4l2_decode_vbi_line *vbi = arg;
223 u8 *p = vbi->p;
224 int id1, id2, l, err = 0;
225
226 if (p[0] || p[1] != 0xff || p[2] != 0xff ||
227 (p[3] != 0x55 && p[3] != 0x91)) {
228 vbi->line = vbi->type = 0;
229 break;
230 }
231
232 p += 4;
233 id1 = p[-1];
234 id2 = p[0] & 0xf;
235 l = p[2] & 0x3f;
236 l += state->vbi_line_offset;
237 p += 4;
238
239 switch (id2) {
240 case 1:
241 id2 = V4L2_SLICED_TELETEXT_B;
242 break;
243 case 4:
244 id2 = V4L2_SLICED_WSS_625;
245 break;
246 case 6:
247 id2 = V4L2_SLICED_CAPTION_525;
248 err = !odd_parity(p[0]) || !odd_parity(p[1]);
249 break;
250 case 9:
251 id2 = V4L2_SLICED_VPS;
252 if (decode_vps(p, p) != 0)
253 err = 1;
254 break;
255 default:
256 id2 = 0;
257 err = 1;
258 break;
259 }
260
261 vbi->type = err ? 0 : id2;
262 vbi->line = err ? 0 : l;
263 vbi->is_second_field = err ? 0 : (id1 == 0x55);
264 vbi->p = p;
265 break;
266 }
267 }
268
269 return 0;
270 }
271