1 /*
2 * cx18 Vertical Blank Interval support functions
3 *
4 * Derived from ivtv-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 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.
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., 59 Temple Place, Suite 330, Boston, MA
21 * 02111-1307 USA
22 */
23
24 #include "cx18-driver.h"
25 #include "cx18-vbi.h"
26 #include "cx18-ioctl.h"
27 #include "cx18-queue.h"
28
29 /*
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 ancillary data regions in the digitial ratser line.
33 *
34 * Task FieldEven VerticalBlank HorizontalBlank 0 0 0 0
35 */
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 */
38
copy_vbi_data(struct cx18 * cx,int lines,u32 pts_stamp)39 static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp)
40 {
41 int line = 0;
42 int i;
43 u32 linemask[2] = { 0, 0 };
44 unsigned short size;
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 */
57 };
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];
61
62 for (i = 0; i < lines; i++) {
63 struct v4l2_sliced_vbi_data *sdata = cx->vbi.sliced_data + i;
64 int f, l;
65
66 if (sdata->id == 0)
67 continue;
68
69 l = sdata->line - 6;
70 f = sdata->field;
71 if (f)
72 l += 18;
73 if (l < 32)
74 linemask[0] |= (1 << l);
75 else
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);
79 line++;
80 }
81 memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data));
82 if (line == 36) {
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);
89 } else {
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);
95 }
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;
104 }
105
106 /* Compress raw VBI format, removes leading SAV codes and surplus space
107 after the frame. Returns new compressed size. */
108 /* FIXME - this function ignores the input size. */
compress_raw_buf(struct cx18 * cx,u8 * buf,u32 size,u32 hdr_size)109 static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size, u32 hdr_size)
110 {
111 u32 line_size = vbi_active_samples;
112 u32 lines = cx->vbi.count * 2;
113 u8 *q = buf;
114 u8 *p;
115 int i;
116
117 /* Skip the header */
118 buf += hdr_size;
119
120 for (i = 0; i < lines; i++) {
121 p = buf + i * line_size;
122
123 /* Look for SAV code */
124 if (p[0] != 0xff || p[1] || p[2] ||
125 (p[3] != raw_vbi_sav_rp[0] &&
126 p[3] != raw_vbi_sav_rp[1]))
127 break;
128 if (i == lines - 1) {
129 /* last line is hdr_size bytes short - extrapolate it */
130 memcpy(q, p + 4, line_size - 4 - hdr_size);
131 q += line_size - 4 - hdr_size;
132 p += line_size - hdr_size - 1;
133 memset(q, (int) *p, hdr_size);
134 } else {
135 memcpy(q, p + 4, line_size - 4);
136 q += line_size - 4;
137 }
138 }
139 return lines * (line_size - 4);
140 }
141
compress_sliced_buf(struct cx18 * cx,u8 * buf,u32 size,const u32 hdr_size)142 static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size,
143 const u32 hdr_size)
144 {
145 struct v4l2_decode_vbi_line vbi;
146 int i;
147 u32 line = 0;
148 u32 line_size = cx->is_60hz ? vbi_hblank_samples_60Hz
149 : vbi_hblank_samples_50Hz;
150
151 /* find the first valid line */
152 for (i = hdr_size, buf += hdr_size; i < size; i++, buf++) {
153 if (buf[0] == 0xff && !buf[1] && !buf[2] &&
154 (buf[3] == sliced_vbi_eav_rp[0] ||
155 buf[3] == sliced_vbi_eav_rp[1]))
156 break;
157 }
158
159 /*
160 * The last line is short by hdr_size bytes, but for the remaining
161 * checks against size, we pretend that it is not, by counting the
162 * header bytes we knowingly skipped
163 */
164 size -= (i - hdr_size);
165 if (size < line_size)
166 return line;
167
168 for (i = 0; i < size / line_size; i++) {
169 u8 *p = buf + i * line_size;
170
171 /* Look for EAV code */
172 if (p[0] != 0xff || p[1] || p[2] ||
173 (p[3] != sliced_vbi_eav_rp[0] &&
174 p[3] != sliced_vbi_eav_rp[1]))
175 continue;
176 vbi.p = p + 4;
177 v4l2_subdev_call(cx->sd_av, vbi, decode_vbi_line, &vbi);
178 if (vbi.type) {
179 cx->vbi.sliced_data[line].id = vbi.type;
180 cx->vbi.sliced_data[line].field = vbi.is_second_field;
181 cx->vbi.sliced_data[line].line = vbi.line;
182 memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42);
183 line++;
184 }
185 }
186 return line;
187 }
188
_cx18_process_vbi_data(struct cx18 * cx,struct cx18_buffer * buf)189 static void _cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf)
190 {
191 /*
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]
194 */
195 struct vbi_data_hdr {
196 __be32 magic;
197 __be32 unknown;
198 __be32 pts;
199 } *hdr = (struct vbi_data_hdr *) buf->buf;
200
201 u8 *p = (u8 *) buf->buf;
202 u32 size = buf->bytesused;
203 u32 pts;
204 int lines;
205
206 /*
207 * The CX23418 sends us data that is 32 bit little-endian swapped,
208 * but we want the raw VBI bytes in the order they were in the raster
209 * line. This has a side effect of making the header big endian
210 */
211 cx18_buf_swap(buf);
212
213 /* Raw VBI data */
214 if (cx18_raw_vbi(cx)) {
215
216 size = buf->bytesused =
217 compress_raw_buf(cx, p, size, sizeof(struct vbi_data_hdr));
218
219 /*
220 * Hack needed for compatibility with old VBI software.
221 * Write the frame # at the last 4 bytes of the frame
222 */
223 p += size - 4;
224 memcpy(p, &cx->vbi.frame, 4);
225 cx->vbi.frame++;
226 return;
227 }
228
229 /* Sliced VBI data with data insertion */
230
231 pts = (be32_to_cpu(hdr->magic) == 0x3fffffff) ? be32_to_cpu(hdr->pts)
232 : 0;
233
234 lines = compress_sliced_buf(cx, p, size, sizeof(struct vbi_data_hdr));
235
236 /* always return at least one empty line */
237 if (lines == 0) {
238 cx->vbi.sliced_data[0].id = 0;
239 cx->vbi.sliced_data[0].line = 0;
240 cx->vbi.sliced_data[0].field = 0;
241 lines = 1;
242 }
243 buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]);
244 memcpy(p, &cx->vbi.sliced_data[0], size);
245
246 if (cx->vbi.insert_mpeg)
247 copy_vbi_data(cx, lines, pts);
248 cx->vbi.frame++;
249 }
250
cx18_process_vbi_data(struct cx18 * cx,struct cx18_mdl * mdl,int streamtype)251 void cx18_process_vbi_data(struct cx18 *cx, struct cx18_mdl *mdl,
252 int streamtype)
253 {
254 struct cx18_buffer *buf;
255 u32 orig_used;
256
257 if (streamtype != CX18_ENC_STREAM_TYPE_VBI)
258 return;
259
260 /*
261 * Big assumption here:
262 * Every buffer hooked to the MDL's buf_list is a complete VBI frame
263 * that ends at the end of the buffer.
264 *
265 * To assume anything else would make the code in this file
266 * more complex, or require extra memcpy()'s to make the
267 * buffers satisfy the above assumption. It's just simpler to set
268 * up the encoder buffer transfers to make the assumption true.
269 */
270 list_for_each_entry(buf, &mdl->buf_list, list) {
271 orig_used = buf->bytesused;
272 if (orig_used == 0)
273 break;
274 _cx18_process_vbi_data(cx, buf);
275 mdl->bytesused -= (orig_used - buf->bytesused);
276 }
277 }
278