2 * cx18 Vertical Blank Interval support functions
4 * Derived from ivtv-vbi.c
6 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
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.
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., 59 Temple Place, Suite 330, Boston, MA
24 #include "cx18-driver.h"
26 #include "cx18-ioctl.h"
27 #include "cx18-queue.h"
28 #include "cx18-av-core.h"
31 * Raster Reference/Protection (RP) bytes, used in Start/End Active
32 * Video codes emitted from the digitzer in VIP 1.x mode, that flag the start
33 * of VBI sample or VBI ancilliary data regions in the digitial ratser line.
35 * Task FieldEven VerticalBlank HorizontalBlank 0 0 0 0
37 static const u8 raw_vbi_sav_rp[2] = { 0x20, 0x60 }; /* __V_, _FV_ */
38 static const u8 sliced_vbi_eav_rp[2] = { 0xb0, 0xf0 }; /* T_VH, TFVH */
40 static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp)
44 u32 linemask[2] = { 0, 0 };
46 static const u8 mpeg_hdr_data[] = {
47 /* MPEG-2 Program Pack */
48 0x00, 0x00, 0x01, 0xba, /* Prog Pack start code */
49 0x44, 0x00, 0x0c, 0x66, 0x24, 0x01, /* SCR, SCR Ext, markers */
50 0x01, 0xd1, 0xd3, /* Mux Rate, markers */
51 0xfa, 0xff, 0xff, /* Res, Suff cnt, Stuff */
52 /* MPEG-2 Private Stream 1 PES Packet */
53 0x00, 0x00, 0x01, 0xbd, /* Priv Stream 1 start */
54 0x00, 0x1a, /* length */
55 0x84, 0x80, 0x07, /* flags, hdr data len */
56 0x21, 0x00, 0x5d, 0x63, 0xa7, /* PTS, markers */
57 0xff, 0xff /* stuffing */
59 const int sd = sizeof(mpeg_hdr_data); /* start of vbi data */
60 int idx = cx->vbi.frame % CX18_VBI_FRAMES;
61 u8 *dst = &cx->vbi.sliced_mpeg_data[idx][0];
63 for (i = 0; i < lines; i++) {
64 struct v4l2_sliced_vbi_data *sdata = cx->vbi.sliced_data + i;
75 linemask[0] |= (1 << l);
77 linemask[1] |= (1 << (l - 32));
78 dst[sd + 12 + line * 43] = cx18_service2vbi(sdata->id);
79 memcpy(dst + sd + 12 + line * 43 + 1, sdata->data, 42);
82 memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data));
84 /* All lines are used, so there is no space for the linemask
85 (the max size of the VBI data is 36 * 43 + 4 bytes).
86 So in this case we use the magic number 'ITV0'. */
87 memcpy(dst + sd, "ITV0", 4);
88 memcpy(dst + sd + 4, dst + sd + 12, line * 43);
89 size = 4 + ((43 * line + 3) & ~3);
91 memcpy(dst + sd, "itv0", 4);
92 memcpy(dst + sd + 4, &linemask[0], 8);
93 size = 12 + ((43 * line + 3) & ~3);
95 dst[4+16] = (size + 10) >> 8;
96 dst[5+16] = (size + 10) & 0xff;
97 dst[9+16] = 0x21 | ((pts_stamp >> 29) & 0x6);
98 dst[10+16] = (pts_stamp >> 22) & 0xff;
99 dst[11+16] = 1 | ((pts_stamp >> 14) & 0xff);
100 dst[12+16] = (pts_stamp >> 7) & 0xff;
101 dst[13+16] = 1 | ((pts_stamp & 0x7f) << 1);
102 cx->vbi.sliced_mpeg_size[idx] = sd + size;
105 /* Compress raw VBI format, removes leading SAV codes and surplus space
107 Returns new compressed size. */
108 static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size)
110 u32 line_size = vbi_active_samples;
111 u32 lines = cx->vbi.count;
112 u8 sav1 = raw_vbi_sav_rp[0];
113 u8 sav2 = raw_vbi_sav_rp[1];
118 for (i = 0; i < lines; i++) {
119 p = buf + i * line_size;
121 /* Look for SAV code */
122 if (p[0] != 0xff || p[1] || p[2] ||
123 (p[3] != sav1 && p[3] != sav2))
125 memcpy(q, p + 4, line_size - 4);
128 return lines * (line_size - 4);
132 /* Compressed VBI format, all found sliced blocks put next to one another
133 Returns new compressed size */
134 static u32 compress_sliced_buf(struct cx18 *cx, u32 line, u8 *buf,
137 struct v4l2_decode_vbi_line vbi;
139 u32 line_size = cx->is_60hz ? vbi_hblank_samples_60Hz
140 : vbi_hblank_samples_50Hz;
142 /* find the first valid line */
143 for (i = 0; i < size; i++, buf++) {
144 if (buf[0] == 0xff && !buf[1] && !buf[2] && buf[3] == eav)
149 if (size < line_size)
151 for (i = 0; i < size / line_size; i++) {
152 u8 *p = buf + i * line_size;
154 /* Look for EAV code */
155 if (p[0] != 0xff || p[1] || p[2] || p[3] != eav)
158 cx18_av_cmd(cx, VIDIOC_INT_DECODE_VBI_LINE, &vbi);
160 cx->vbi.sliced_data[line].id = vbi.type;
161 cx->vbi.sliced_data[line].field = vbi.is_second_field;
162 cx->vbi.sliced_data[line].line = vbi.line;
163 memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42);
170 void cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf,
173 u8 *p = (u8 *) buf->buf;
174 u32 *q = (u32 *) buf->buf;
175 u32 size = buf->bytesused;
179 if (streamtype != CX18_ENC_STREAM_TYPE_VBI)
185 * The CX23418 provides a 12 byte header in it's raw VBI buffers to us:
186 * 0x3fffffff [4 bytes of something] [4 byte presentation time stamp?]
190 if (cx18_raw_vbi(cx)) {
193 /* Skip 12 bytes of header that gets stuffed in */
195 memcpy(p, &buf->buf[12], size);
198 size = buf->bytesused = compress_raw_buf(cx, p, size);
200 /* second field of the frame? */
201 if (type == raw_vbi_sav_rp[1]) {
202 /* Dirty hack needed for backwards
203 compatibility of old VBI software. */
205 memcpy(p, &cx->vbi.frame, 4);
211 /* Sliced VBI data with data insertion */
213 pts = (q[0] == 0x3fffffff) ? q[2] : 0;
216 /* compress_sliced_buf() will skip the 12 bytes of header */
217 lines = compress_sliced_buf(cx, 0, p, size / 2, sliced_vbi_eav_rp[0]);
219 /* experimentation shows that the second half does not always
220 begin at the exact address. So start a bit earlier
222 lines = compress_sliced_buf(cx, lines, p + size / 2 - 32,
223 size / 2 + 32, sliced_vbi_eav_rp[1]);
224 /* always return at least one empty line */
226 cx->vbi.sliced_data[0].id = 0;
227 cx->vbi.sliced_data[0].line = 0;
228 cx->vbi.sliced_data[0].field = 0;
231 buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]);
232 memcpy(p, &cx->vbi.sliced_data[0], size);
234 if (cx->vbi.insert_mpeg)
235 copy_vbi_data(cx, lines, pts);