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"
30 * Raster Reference/Protection (RP) bytes, used in Start/End Active
31 * Video codes emitted from the digitzer in VIP 1.x mode, that flag the start
32 * of VBI sample or VBI ancilliary data regions in the digitial ratser line.
34 * Task FieldEven VerticalBlank HorizontalBlank 0 0 0 0
36 static const u8 raw_vbi_sav_rp[2] = { 0x20, 0x60 }; /* __V_, _FV_ */
37 static const u8 sliced_vbi_eav_rp[2] = { 0xb0, 0xf0 }; /* T_VH, TFVH */
39 static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp)
43 u32 linemask[2] = { 0, 0 };
45 static const u8 mpeg_hdr_data[] = {
46 /* MPEG-2 Program Pack */
47 0x00, 0x00, 0x01, 0xba, /* Prog Pack start code */
48 0x44, 0x00, 0x0c, 0x66, 0x24, 0x01, /* SCR, SCR Ext, markers */
49 0x01, 0xd1, 0xd3, /* Mux Rate, markers */
50 0xfa, 0xff, 0xff, /* Res, Suff cnt, Stuff */
51 /* MPEG-2 Private Stream 1 PES Packet */
52 0x00, 0x00, 0x01, 0xbd, /* Priv Stream 1 start */
53 0x00, 0x1a, /* length */
54 0x84, 0x80, 0x07, /* flags, hdr data len */
55 0x21, 0x00, 0x5d, 0x63, 0xa7, /* PTS, markers */
56 0xff, 0xff /* stuffing */
58 const int sd = sizeof(mpeg_hdr_data); /* start of vbi data */
59 int idx = cx->vbi.frame % CX18_VBI_FRAMES;
60 u8 *dst = &cx->vbi.sliced_mpeg_data[idx][0];
62 for (i = 0; i < lines; i++) {
63 struct v4l2_sliced_vbi_data *sdata = cx->vbi.sliced_data + i;
74 linemask[0] |= (1 << l);
76 linemask[1] |= (1 << (l - 32));
77 dst[sd + 12 + line * 43] = cx18_service2vbi(sdata->id);
78 memcpy(dst + sd + 12 + line * 43 + 1, sdata->data, 42);
81 memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data));
83 /* All lines are used, so there is no space for the linemask
84 (the max size of the VBI data is 36 * 43 + 4 bytes).
85 So in this case we use the magic number 'ITV0'. */
86 memcpy(dst + sd, "ITV0", 4);
87 memcpy(dst + sd + 4, dst + sd + 12, line * 43);
88 size = 4 + ((43 * line + 3) & ~3);
90 memcpy(dst + sd, "itv0", 4);
91 cpu_to_le32s(&linemask[0]);
92 cpu_to_le32s(&linemask[1]);
93 memcpy(dst + sd + 4, &linemask[0], 8);
94 size = 12 + ((43 * line + 3) & ~3);
96 dst[4+16] = (size + 10) >> 8;
97 dst[5+16] = (size + 10) & 0xff;
98 dst[9+16] = 0x21 | ((pts_stamp >> 29) & 0x6);
99 dst[10+16] = (pts_stamp >> 22) & 0xff;
100 dst[11+16] = 1 | ((pts_stamp >> 14) & 0xff);
101 dst[12+16] = (pts_stamp >> 7) & 0xff;
102 dst[13+16] = 1 | ((pts_stamp & 0x7f) << 1);
103 cx->vbi.sliced_mpeg_size[idx] = sd + size;
106 /* Compress raw VBI format, removes leading SAV codes and surplus space
107 after the frame. Returns new compressed size. */
108 static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size, u32 hdr_size)
110 u32 line_size = vbi_active_samples;
111 u32 lines = cx->vbi.count * 2;
116 /* Skip the header */
119 for (i = 0; i < lines; i++) {
120 p = buf + i * line_size;
122 /* Look for SAV code */
123 if (p[0] != 0xff || p[1] || p[2] ||
124 (p[3] != raw_vbi_sav_rp[0] &&
125 p[3] != raw_vbi_sav_rp[1]))
127 if (i == lines - 1) {
128 /* last line is hdr_size bytes short - extrapolate it */
129 memcpy(q, p + 4, line_size - 4 - hdr_size);
130 q += line_size - 4 - hdr_size;
131 p += line_size - hdr_size - 1;
132 memset(q, (int) *p, hdr_size);
134 memcpy(q, p + 4, line_size - 4);
138 return lines * (line_size - 4);
141 static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size,
144 struct v4l2_decode_vbi_line vbi;
147 u32 line_size = cx->is_60hz ? vbi_hblank_samples_60Hz
148 : vbi_hblank_samples_50Hz;
150 /* find the first valid line */
151 for (i = hdr_size, buf += hdr_size; i < size; i++, buf++) {
152 if (buf[0] == 0xff && !buf[1] && !buf[2] &&
153 (buf[3] == sliced_vbi_eav_rp[0] ||
154 buf[3] == sliced_vbi_eav_rp[1]))
159 * The last line is short by hdr_size bytes, but for the remaining
160 * checks against size, we pretend that it is not, by counting the
161 * header bytes we knowingly skipped
163 size -= (i - hdr_size);
164 if (size < line_size)
167 for (i = 0; i < size / line_size; i++) {
168 u8 *p = buf + i * line_size;
170 /* Look for EAV code */
171 if (p[0] != 0xff || p[1] || p[2] ||
172 (p[3] != sliced_vbi_eav_rp[0] &&
173 p[3] != sliced_vbi_eav_rp[1]))
176 v4l2_subdev_call(cx->sd_av, video, decode_vbi_line, &vbi);
178 cx->vbi.sliced_data[line].id = vbi.type;
179 cx->vbi.sliced_data[line].field = vbi.is_second_field;
180 cx->vbi.sliced_data[line].line = vbi.line;
181 memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42);
188 void cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf,
192 * The CX23418 provides a 12 byte header in its raw VBI buffers to us:
193 * 0x3fffffff [4 bytes of something] [4 byte presentation time stamp]
195 struct vbi_data_hdr {
199 } *hdr = (struct vbi_data_hdr *) buf->buf;
201 u8 *p = (u8 *) buf->buf;
202 u32 size = buf->bytesused;
206 if (streamtype != CX18_ENC_STREAM_TYPE_VBI)
210 * The CX23418 sends us data that is 32 bit little-endian swapped,
211 * but we want the raw VBI bytes in the order they were in the raster
212 * line. This has a side effect of making the header big endian
217 if (cx18_raw_vbi(cx)) {
219 size = buf->bytesused =
220 compress_raw_buf(cx, p, size, sizeof(struct vbi_data_hdr));
223 * Hack needed for compatibility with old VBI software.
224 * Write the frame # at the last 4 bytes of the frame
227 memcpy(p, &cx->vbi.frame, 4);
232 /* Sliced VBI data with data insertion */
234 pts = (be32_to_cpu(hdr->magic) == 0x3fffffff) ? be32_to_cpu(hdr->pts)
237 lines = compress_sliced_buf(cx, p, size, sizeof(struct vbi_data_hdr));
239 /* always return at least one empty line */
241 cx->vbi.sliced_data[0].id = 0;
242 cx->vbi.sliced_data[0].line = 0;
243 cx->vbi.sliced_data[0].field = 0;
246 buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]);
247 memcpy(p, &cx->vbi.sliced_data[0], size);
249 if (cx->vbi.insert_mpeg)
250 copy_vbi_data(cx, lines, pts);