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 memcpy(dst + sd + 4, &linemask[0], 8);
92 size = 12 + ((43 * line + 3) & ~3);
94 dst[4+16] = (size + 10) >> 8;
95 dst[5+16] = (size + 10) & 0xff;
96 dst[9+16] = 0x21 | ((pts_stamp >> 29) & 0x6);
97 dst[10+16] = (pts_stamp >> 22) & 0xff;
98 dst[11+16] = 1 | ((pts_stamp >> 14) & 0xff);
99 dst[12+16] = (pts_stamp >> 7) & 0xff;
100 dst[13+16] = 1 | ((pts_stamp & 0x7f) << 1);
101 cx->vbi.sliced_mpeg_size[idx] = sd + size;
104 /* Compress raw VBI format, removes leading SAV codes and surplus space
105 after the frame. Returns new compressed size. */
106 static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size)
108 u32 line_size = vbi_active_samples;
109 u32 lines = cx->vbi.count * 2;
110 u8 sav1 = raw_vbi_sav_rp[0];
111 u8 sav2 = raw_vbi_sav_rp[1];
116 for (i = 0; i < lines; i++) {
117 p = buf + i * line_size;
119 /* Look for SAV code */
120 if (p[0] != 0xff || p[1] || p[2] ||
121 (p[3] != sav1 && p[3] != sav2))
123 memcpy(q, p + 4, line_size - 4);
126 return lines * (line_size - 4);
130 /* Compressed VBI format, all found sliced blocks put next to one another
131 Returns new compressed size */
132 static u32 compress_sliced_buf(struct cx18 *cx, u32 line, u8 *buf,
135 struct v4l2_decode_vbi_line vbi;
137 u32 line_size = cx->is_60hz ? vbi_hblank_samples_60Hz
138 : vbi_hblank_samples_50Hz;
140 /* find the first valid line */
141 for (i = 0; i < size; i++, buf++) {
142 if (buf[0] == 0xff && !buf[1] && !buf[2] && buf[3] == eav)
147 if (size < line_size)
149 for (i = 0; i < size / line_size; i++) {
150 u8 *p = buf + i * line_size;
152 /* Look for EAV code */
153 if (p[0] != 0xff || p[1] || p[2] || p[3] != eav)
156 v4l2_subdev_call(cx->sd_av, video, decode_vbi_line, &vbi);
158 cx->vbi.sliced_data[line].id = vbi.type;
159 cx->vbi.sliced_data[line].field = vbi.is_second_field;
160 cx->vbi.sliced_data[line].line = vbi.line;
161 memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42);
168 void cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf,
171 u8 *p = (u8 *) buf->buf;
172 u32 *q = (u32 *) buf->buf;
173 u32 size = buf->bytesused;
177 if (streamtype != CX18_ENC_STREAM_TYPE_VBI)
181 * The CX23418 sends us data that is 32 bit LE swapped, but we want
182 * the raw VBI bytes in the order they were in the raster line
187 * The CX23418 provides a 12 byte header in it's raw VBI buffers to us:
188 * 0x3fffffff [4 bytes of something] [4 byte presentation time stamp?]
192 if (cx18_raw_vbi(cx)) {
196 * We've set up to get a frame's worth of VBI data at a time.
197 * Skip 12 bytes of header prefixing the first field.
200 memcpy(p, &buf->buf[12], size);
203 /* Extrapolate the last 12 bytes of the frame's last line */
204 memset(&p[size], (int) p[size - 1], 12);
207 size = buf->bytesused = compress_raw_buf(cx, p, size);
210 * Hack needed for compatibility with old VBI software.
211 * Write the frame # at the last 4 bytes of the frame
214 memcpy(p, &cx->vbi.frame, 4);
219 /* Sliced VBI data with data insertion */
221 pts = (be32_to_cpu(q[0] == 0x3fffffff)) ? be32_to_cpu(q[2]) : 0;
224 * For calls to compress_sliced_buf(), ensure there are an integral
225 * number of lines by shifting the real data up over the 12 bytes header
226 * that got stuffed in.
227 * FIXME - there's a smarter way to do this with pointers, but for some
228 * reason I can't get it to work correctly right now.
230 memcpy(p, &buf->buf[12], size-12);
233 lines = compress_sliced_buf(cx, 0, p, size / 2, sliced_vbi_eav_rp[0]);
236 * In case the second half does not always begin at the exact address,
237 * start a bit earlier (hence 32).
239 lines = compress_sliced_buf(cx, lines, p + size / 2 - 32,
240 size / 2 + 32, sliced_vbi_eav_rp[1]);
241 /* always return at least one empty line */
243 cx->vbi.sliced_data[0].id = 0;
244 cx->vbi.sliced_data[0].line = 0;
245 cx->vbi.sliced_data[0].field = 0;
248 buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]);
249 memcpy(p, &cx->vbi.sliced_data[0], size);
251 if (cx->vbi.insert_mpeg)
252 copy_vbi_data(cx, lines, pts);