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
|
/*
* cx18 Vertical Blank Interval support functions
*
* Derived from ivtv-vbi.c
*
* Copyright (C) 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 "cx18-driver.h"
#include "cx18-vbi.h"
#include "cx18-ioctl.h"
#include "cx18-queue.h"
#include "cx18-av-core.h"
/*
* Raster Reference/Protection (RP) bytes, used in Start/End Active
* Video codes emitted from the digitzer in VIP 1.x mode, that flag the start
* of VBI sample or VBI ancilliary data regions in the digitial ratser line.
*
* Task FieldEven VerticalBlank HorizontalBlank 0 0 0 0
*/
static const u8 raw_vbi_sav_rp[2] = { 0x20, 0x60 }; /* __V_, _FV_ */
static const u8 sliced_vbi_eav_rp[2] = { 0xb0, 0xf0 }; /* T_VH, TFVH */
static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp)
{
int line = 0;
int i;
u32 linemask[2] = { 0, 0 };
unsigned short size;
static const u8 mpeg_hdr_data[] = {
/* MPEG-2 Program Pack */
0x00, 0x00, 0x01, 0xba, /* Prog Pack start code */
0x44, 0x00, 0x0c, 0x66, 0x24, 0x01, /* SCR, SCR Ext, markers */
0x01, 0xd1, 0xd3, /* Mux Rate, markers */
0xfa, 0xff, 0xff, /* Res, Suff cnt, Stuff */
/* MPEG-2 Private Stream 1 PES Packet */
0x00, 0x00, 0x01, 0xbd, /* Priv Stream 1 start */
0x00, 0x1a, /* length */
0x84, 0x80, 0x07, /* flags, hdr data len */
0x21, 0x00, 0x5d, 0x63, 0xa7, /* PTS, markers */
0xff, 0xff /* stuffing */
};
const int sd = sizeof(mpeg_hdr_data); /* start of vbi data */
int idx = cx->vbi.frame % CX18_VBI_FRAMES;
u8 *dst = &cx->vbi.sliced_mpeg_data[idx][0];
for (i = 0; i < lines; i++) {
struct v4l2_sliced_vbi_data *sdata = cx->vbi.sliced_data + i;
int f, l;
if (sdata->id == 0)
continue;
l = sdata->line - 6;
f = sdata->field;
if (f)
l += 18;
if (l < 32)
linemask[0] |= (1 << l);
else
linemask[1] |= (1 << (l - 32));
dst[sd + 12 + line * 43] = cx18_service2vbi(sdata->id);
memcpy(dst + sd + 12 + line * 43 + 1, sdata->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);
cx->vbi.sliced_mpeg_size[idx] = sd + size;
}
/* Compress raw VBI format, removes leading SAV codes and surplus space
after the field.
Returns new compressed size. */
static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size)
{
u32 line_size = vbi_active_samples;
u32 lines = cx->vbi.count;
u8 sav1 = raw_vbi_sav_rp[0];
u8 sav2 = raw_vbi_sav_rp[1];
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 cx18 *cx, u32 line, u8 *buf,
u32 size, u8 eav)
{
struct v4l2_decode_vbi_line vbi;
int i;
u32 line_size = cx->is_60hz ? vbi_hblank_samples_60Hz
: vbi_hblank_samples_50Hz;
/* find the first valid line */
for (i = 0; i < size; i++, buf++) {
if (buf[0] == 0xff && !buf[1] && !buf[2] && buf[3] == eav)
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 EAV code */
if (p[0] != 0xff || p[1] || p[2] || p[3] != eav)
continue;
vbi.p = p + 4;
cx18_av_cmd(cx, VIDIOC_INT_DECODE_VBI_LINE, &vbi);
if (vbi.type) {
cx->vbi.sliced_data[line].id = vbi.type;
cx->vbi.sliced_data[line].field = vbi.is_second_field;
cx->vbi.sliced_data[line].line = vbi.line;
memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42);
line++;
}
}
return line;
}
void cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf,
int streamtype)
{
u8 *p = (u8 *) buf->buf;
u32 *q = (u32 *) buf->buf;
u32 size = buf->bytesused;
u32 pts;
int lines;
if (streamtype != CX18_ENC_STREAM_TYPE_VBI)
return;
cx18_buf_swap(buf);
/*
* The CX23418 provides a 12 byte header in it's raw VBI buffers to us:
* 0x3fffffff [4 bytes of something] [4 byte presentation time stamp?]
*/
/* Raw VBI data */
if (cx18_raw_vbi(cx)) {
u8 type;
/* Skip 12 bytes of header that gets stuffed in */
size -= 12;
memcpy(p, &buf->buf[12], size);
type = p[3];
size = buf->bytesused = compress_raw_buf(cx, p, size);
/* second field of the frame? */
if (type == raw_vbi_sav_rp[1]) {
/* Dirty hack needed for backwards
compatibility of old VBI software. */
p += size - 4;
memcpy(p, &cx->vbi.frame, 4);
cx->vbi.frame++;
}
return;
}
/* Sliced VBI data with data insertion */
pts = (q[0] == 0x3fffffff) ? q[2] : 0;
/* first field */
/* compress_sliced_buf() will skip the 12 bytes of header */
lines = compress_sliced_buf(cx, 0, p, size / 2, sliced_vbi_eav_rp[0]);
/* 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(cx, lines, p + size / 2 - 32,
size / 2 + 32, sliced_vbi_eav_rp[1]);
/* always return at least one empty line */
if (lines == 0) {
cx->vbi.sliced_data[0].id = 0;
cx->vbi.sliced_data[0].line = 0;
cx->vbi.sliced_data[0].field = 0;
lines = 1;
}
buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]);
memcpy(p, &cx->vbi.sliced_data[0], size);
if (cx->vbi.insert_mpeg)
copy_vbi_data(cx, lines, pts);
cx->vbi.frame++;
}
|
