1*c942fddfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2b285192aSMauro Carvalho Chehab /*
3b285192aSMauro Carvalho Chehab * cx18 Vertical Blank Interval support functions
4b285192aSMauro Carvalho Chehab *
5b285192aSMauro Carvalho Chehab * Derived from ivtv-vbi.c
6b285192aSMauro Carvalho Chehab *
7b285192aSMauro Carvalho Chehab * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
8b285192aSMauro Carvalho Chehab */
9b285192aSMauro Carvalho Chehab
10b285192aSMauro Carvalho Chehab #include "cx18-driver.h"
11b285192aSMauro Carvalho Chehab #include "cx18-vbi.h"
12b285192aSMauro Carvalho Chehab #include "cx18-ioctl.h"
13b285192aSMauro Carvalho Chehab #include "cx18-queue.h"
14b285192aSMauro Carvalho Chehab
15b285192aSMauro Carvalho Chehab /*
16b285192aSMauro Carvalho Chehab * Raster Reference/Protection (RP) bytes, used in Start/End Active
17b285192aSMauro Carvalho Chehab * Video codes emitted from the digitzer in VIP 1.x mode, that flag the start
1816790554SMauro Carvalho Chehab * of VBI sample or VBI ancillary data regions in the digital ratser line.
19b285192aSMauro Carvalho Chehab *
20b285192aSMauro Carvalho Chehab * Task FieldEven VerticalBlank HorizontalBlank 0 0 0 0
21b285192aSMauro Carvalho Chehab */
22b285192aSMauro Carvalho Chehab static const u8 raw_vbi_sav_rp[2] = { 0x20, 0x60 }; /* __V_, _FV_ */
23b285192aSMauro Carvalho Chehab static const u8 sliced_vbi_eav_rp[2] = { 0xb0, 0xf0 }; /* T_VH, TFVH */
24b285192aSMauro Carvalho Chehab
copy_vbi_data(struct cx18 * cx,int lines,u32 pts_stamp)25b285192aSMauro Carvalho Chehab static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp)
26b285192aSMauro Carvalho Chehab {
27b285192aSMauro Carvalho Chehab int line = 0;
28b285192aSMauro Carvalho Chehab int i;
29b285192aSMauro Carvalho Chehab u32 linemask[2] = { 0, 0 };
30b285192aSMauro Carvalho Chehab unsigned short size;
31b285192aSMauro Carvalho Chehab static const u8 mpeg_hdr_data[] = {
32b285192aSMauro Carvalho Chehab /* MPEG-2 Program Pack */
33b285192aSMauro Carvalho Chehab 0x00, 0x00, 0x01, 0xba, /* Prog Pack start code */
34b285192aSMauro Carvalho Chehab 0x44, 0x00, 0x0c, 0x66, 0x24, 0x01, /* SCR, SCR Ext, markers */
35b285192aSMauro Carvalho Chehab 0x01, 0xd1, 0xd3, /* Mux Rate, markers */
36b285192aSMauro Carvalho Chehab 0xfa, 0xff, 0xff, /* Res, Suff cnt, Stuff */
37b285192aSMauro Carvalho Chehab /* MPEG-2 Private Stream 1 PES Packet */
38b285192aSMauro Carvalho Chehab 0x00, 0x00, 0x01, 0xbd, /* Priv Stream 1 start */
39b285192aSMauro Carvalho Chehab 0x00, 0x1a, /* length */
40b285192aSMauro Carvalho Chehab 0x84, 0x80, 0x07, /* flags, hdr data len */
41b285192aSMauro Carvalho Chehab 0x21, 0x00, 0x5d, 0x63, 0xa7, /* PTS, markers */
42b285192aSMauro Carvalho Chehab 0xff, 0xff /* stuffing */
43b285192aSMauro Carvalho Chehab };
44b285192aSMauro Carvalho Chehab const int sd = sizeof(mpeg_hdr_data); /* start of vbi data */
45b285192aSMauro Carvalho Chehab int idx = cx->vbi.frame % CX18_VBI_FRAMES;
46b285192aSMauro Carvalho Chehab u8 *dst = &cx->vbi.sliced_mpeg_data[idx][0];
47b285192aSMauro Carvalho Chehab
48b285192aSMauro Carvalho Chehab for (i = 0; i < lines; i++) {
49b285192aSMauro Carvalho Chehab struct v4l2_sliced_vbi_data *sdata = cx->vbi.sliced_data + i;
50b285192aSMauro Carvalho Chehab int f, l;
51b285192aSMauro Carvalho Chehab
52b285192aSMauro Carvalho Chehab if (sdata->id == 0)
53b285192aSMauro Carvalho Chehab continue;
54b285192aSMauro Carvalho Chehab
55b285192aSMauro Carvalho Chehab l = sdata->line - 6;
56b285192aSMauro Carvalho Chehab f = sdata->field;
57b285192aSMauro Carvalho Chehab if (f)
58b285192aSMauro Carvalho Chehab l += 18;
59b285192aSMauro Carvalho Chehab if (l < 32)
60b285192aSMauro Carvalho Chehab linemask[0] |= (1 << l);
61b285192aSMauro Carvalho Chehab else
62b285192aSMauro Carvalho Chehab linemask[1] |= (1 << (l - 32));
63b285192aSMauro Carvalho Chehab dst[sd + 12 + line * 43] = cx18_service2vbi(sdata->id);
64b285192aSMauro Carvalho Chehab memcpy(dst + sd + 12 + line * 43 + 1, sdata->data, 42);
65b285192aSMauro Carvalho Chehab line++;
66b285192aSMauro Carvalho Chehab }
67b285192aSMauro Carvalho Chehab memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data));
68b285192aSMauro Carvalho Chehab if (line == 36) {
69b285192aSMauro Carvalho Chehab /* All lines are used, so there is no space for the linemask
70b285192aSMauro Carvalho Chehab (the max size of the VBI data is 36 * 43 + 4 bytes).
71b285192aSMauro Carvalho Chehab So in this case we use the magic number 'ITV0'. */
72b285192aSMauro Carvalho Chehab memcpy(dst + sd, "ITV0", 4);
73bb71b14dSNickolai Zeldovich memmove(dst + sd + 4, dst + sd + 12, line * 43);
74b285192aSMauro Carvalho Chehab size = 4 + ((43 * line + 3) & ~3);
75b285192aSMauro Carvalho Chehab } else {
76b285192aSMauro Carvalho Chehab memcpy(dst + sd, "itv0", 4);
77b285192aSMauro Carvalho Chehab cpu_to_le32s(&linemask[0]);
78b285192aSMauro Carvalho Chehab cpu_to_le32s(&linemask[1]);
79b285192aSMauro Carvalho Chehab memcpy(dst + sd + 4, &linemask[0], 8);
80b285192aSMauro Carvalho Chehab size = 12 + ((43 * line + 3) & ~3);
81b285192aSMauro Carvalho Chehab }
82b285192aSMauro Carvalho Chehab dst[4+16] = (size + 10) >> 8;
83b285192aSMauro Carvalho Chehab dst[5+16] = (size + 10) & 0xff;
84b285192aSMauro Carvalho Chehab dst[9+16] = 0x21 | ((pts_stamp >> 29) & 0x6);
85b285192aSMauro Carvalho Chehab dst[10+16] = (pts_stamp >> 22) & 0xff;
86b285192aSMauro Carvalho Chehab dst[11+16] = 1 | ((pts_stamp >> 14) & 0xff);
87b285192aSMauro Carvalho Chehab dst[12+16] = (pts_stamp >> 7) & 0xff;
88b285192aSMauro Carvalho Chehab dst[13+16] = 1 | ((pts_stamp & 0x7f) << 1);
89b285192aSMauro Carvalho Chehab cx->vbi.sliced_mpeg_size[idx] = sd + size;
90b285192aSMauro Carvalho Chehab }
91b285192aSMauro Carvalho Chehab
92b285192aSMauro Carvalho Chehab /* Compress raw VBI format, removes leading SAV codes and surplus space
93b285192aSMauro Carvalho Chehab after the frame. Returns new compressed size. */
94b285192aSMauro Carvalho Chehab /* FIXME - this function ignores the input size. */
compress_raw_buf(struct cx18 * cx,u8 * buf,u32 size,u32 hdr_size)95b285192aSMauro Carvalho Chehab static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size, u32 hdr_size)
96b285192aSMauro Carvalho Chehab {
97318de791SMauro Carvalho Chehab u32 line_size = VBI_ACTIVE_SAMPLES;
98b285192aSMauro Carvalho Chehab u32 lines = cx->vbi.count * 2;
99b285192aSMauro Carvalho Chehab u8 *q = buf;
100b285192aSMauro Carvalho Chehab u8 *p;
101b285192aSMauro Carvalho Chehab int i;
102b285192aSMauro Carvalho Chehab
103b285192aSMauro Carvalho Chehab /* Skip the header */
104b285192aSMauro Carvalho Chehab buf += hdr_size;
105b285192aSMauro Carvalho Chehab
106b285192aSMauro Carvalho Chehab for (i = 0; i < lines; i++) {
107b285192aSMauro Carvalho Chehab p = buf + i * line_size;
108b285192aSMauro Carvalho Chehab
109b285192aSMauro Carvalho Chehab /* Look for SAV code */
110b285192aSMauro Carvalho Chehab if (p[0] != 0xff || p[1] || p[2] ||
111b285192aSMauro Carvalho Chehab (p[3] != raw_vbi_sav_rp[0] &&
112b285192aSMauro Carvalho Chehab p[3] != raw_vbi_sav_rp[1]))
113b285192aSMauro Carvalho Chehab break;
114b285192aSMauro Carvalho Chehab if (i == lines - 1) {
115b285192aSMauro Carvalho Chehab /* last line is hdr_size bytes short - extrapolate it */
116b285192aSMauro Carvalho Chehab memcpy(q, p + 4, line_size - 4 - hdr_size);
117b285192aSMauro Carvalho Chehab q += line_size - 4 - hdr_size;
118b285192aSMauro Carvalho Chehab p += line_size - hdr_size - 1;
119b285192aSMauro Carvalho Chehab memset(q, (int) *p, hdr_size);
120b285192aSMauro Carvalho Chehab } else {
121b285192aSMauro Carvalho Chehab memcpy(q, p + 4, line_size - 4);
122b285192aSMauro Carvalho Chehab q += line_size - 4;
123b285192aSMauro Carvalho Chehab }
124b285192aSMauro Carvalho Chehab }
125b285192aSMauro Carvalho Chehab return lines * (line_size - 4);
126b285192aSMauro Carvalho Chehab }
127b285192aSMauro Carvalho Chehab
compress_sliced_buf(struct cx18 * cx,u8 * buf,u32 size,const u32 hdr_size)128b285192aSMauro Carvalho Chehab static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size,
129b285192aSMauro Carvalho Chehab const u32 hdr_size)
130b285192aSMauro Carvalho Chehab {
131b285192aSMauro Carvalho Chehab struct v4l2_decode_vbi_line vbi;
132b285192aSMauro Carvalho Chehab int i;
133b285192aSMauro Carvalho Chehab u32 line = 0;
134318de791SMauro Carvalho Chehab u32 line_size = cx->is_60hz ? VBI_HBLANK_SAMPLES_60HZ
135318de791SMauro Carvalho Chehab : VBI_HBLANK_SAMPLES_50HZ;
136b285192aSMauro Carvalho Chehab
137b285192aSMauro Carvalho Chehab /* find the first valid line */
138b285192aSMauro Carvalho Chehab for (i = hdr_size, buf += hdr_size; i < size; i++, buf++) {
139b285192aSMauro Carvalho Chehab if (buf[0] == 0xff && !buf[1] && !buf[2] &&
140b285192aSMauro Carvalho Chehab (buf[3] == sliced_vbi_eav_rp[0] ||
141b285192aSMauro Carvalho Chehab buf[3] == sliced_vbi_eav_rp[1]))
142b285192aSMauro Carvalho Chehab break;
143b285192aSMauro Carvalho Chehab }
144b285192aSMauro Carvalho Chehab
145b285192aSMauro Carvalho Chehab /*
146b285192aSMauro Carvalho Chehab * The last line is short by hdr_size bytes, but for the remaining
147b285192aSMauro Carvalho Chehab * checks against size, we pretend that it is not, by counting the
148b285192aSMauro Carvalho Chehab * header bytes we knowingly skipped
149b285192aSMauro Carvalho Chehab */
150b285192aSMauro Carvalho Chehab size -= (i - hdr_size);
151b285192aSMauro Carvalho Chehab if (size < line_size)
152b285192aSMauro Carvalho Chehab return line;
153b285192aSMauro Carvalho Chehab
154b285192aSMauro Carvalho Chehab for (i = 0; i < size / line_size; i++) {
155b285192aSMauro Carvalho Chehab u8 *p = buf + i * line_size;
156b285192aSMauro Carvalho Chehab
157b285192aSMauro Carvalho Chehab /* Look for EAV code */
158b285192aSMauro Carvalho Chehab if (p[0] != 0xff || p[1] || p[2] ||
159b285192aSMauro Carvalho Chehab (p[3] != sliced_vbi_eav_rp[0] &&
160b285192aSMauro Carvalho Chehab p[3] != sliced_vbi_eav_rp[1]))
161b285192aSMauro Carvalho Chehab continue;
162b285192aSMauro Carvalho Chehab vbi.p = p + 4;
163b285192aSMauro Carvalho Chehab v4l2_subdev_call(cx->sd_av, vbi, decode_vbi_line, &vbi);
164b285192aSMauro Carvalho Chehab if (vbi.type) {
165b285192aSMauro Carvalho Chehab cx->vbi.sliced_data[line].id = vbi.type;
166b285192aSMauro Carvalho Chehab cx->vbi.sliced_data[line].field = vbi.is_second_field;
167b285192aSMauro Carvalho Chehab cx->vbi.sliced_data[line].line = vbi.line;
168b285192aSMauro Carvalho Chehab memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42);
169b285192aSMauro Carvalho Chehab line++;
170b285192aSMauro Carvalho Chehab }
171b285192aSMauro Carvalho Chehab }
172b285192aSMauro Carvalho Chehab return line;
173b285192aSMauro Carvalho Chehab }
174b285192aSMauro Carvalho Chehab
_cx18_process_vbi_data(struct cx18 * cx,struct cx18_buffer * buf)175b285192aSMauro Carvalho Chehab static void _cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf)
176b285192aSMauro Carvalho Chehab {
177b285192aSMauro Carvalho Chehab /*
178b285192aSMauro Carvalho Chehab * The CX23418 provides a 12 byte header in its raw VBI buffers to us:
179b285192aSMauro Carvalho Chehab * 0x3fffffff [4 bytes of something] [4 byte presentation time stamp]
180b285192aSMauro Carvalho Chehab */
181b285192aSMauro Carvalho Chehab struct vbi_data_hdr {
182b285192aSMauro Carvalho Chehab __be32 magic;
183b285192aSMauro Carvalho Chehab __be32 unknown;
184b285192aSMauro Carvalho Chehab __be32 pts;
185b285192aSMauro Carvalho Chehab } *hdr = (struct vbi_data_hdr *) buf->buf;
186b285192aSMauro Carvalho Chehab
187b285192aSMauro Carvalho Chehab u8 *p = (u8 *) buf->buf;
188b285192aSMauro Carvalho Chehab u32 size = buf->bytesused;
189b285192aSMauro Carvalho Chehab u32 pts;
190b285192aSMauro Carvalho Chehab int lines;
191b285192aSMauro Carvalho Chehab
192b285192aSMauro Carvalho Chehab /*
193b285192aSMauro Carvalho Chehab * The CX23418 sends us data that is 32 bit little-endian swapped,
194b285192aSMauro Carvalho Chehab * but we want the raw VBI bytes in the order they were in the raster
195b285192aSMauro Carvalho Chehab * line. This has a side effect of making the header big endian
196b285192aSMauro Carvalho Chehab */
197b285192aSMauro Carvalho Chehab cx18_buf_swap(buf);
198b285192aSMauro Carvalho Chehab
199b285192aSMauro Carvalho Chehab /* Raw VBI data */
200b285192aSMauro Carvalho Chehab if (cx18_raw_vbi(cx)) {
201b285192aSMauro Carvalho Chehab
202b285192aSMauro Carvalho Chehab size = buf->bytesused =
203b285192aSMauro Carvalho Chehab compress_raw_buf(cx, p, size, sizeof(struct vbi_data_hdr));
204b285192aSMauro Carvalho Chehab
205b285192aSMauro Carvalho Chehab /*
206b285192aSMauro Carvalho Chehab * Hack needed for compatibility with old VBI software.
207b285192aSMauro Carvalho Chehab * Write the frame # at the last 4 bytes of the frame
208b285192aSMauro Carvalho Chehab */
209b285192aSMauro Carvalho Chehab p += size - 4;
210b285192aSMauro Carvalho Chehab memcpy(p, &cx->vbi.frame, 4);
211b285192aSMauro Carvalho Chehab cx->vbi.frame++;
212b285192aSMauro Carvalho Chehab return;
213b285192aSMauro Carvalho Chehab }
214b285192aSMauro Carvalho Chehab
215b285192aSMauro Carvalho Chehab /* Sliced VBI data with data insertion */
216b285192aSMauro Carvalho Chehab
217b285192aSMauro Carvalho Chehab pts = (be32_to_cpu(hdr->magic) == 0x3fffffff) ? be32_to_cpu(hdr->pts)
218b285192aSMauro Carvalho Chehab : 0;
219b285192aSMauro Carvalho Chehab
220b285192aSMauro Carvalho Chehab lines = compress_sliced_buf(cx, p, size, sizeof(struct vbi_data_hdr));
221b285192aSMauro Carvalho Chehab
222b285192aSMauro Carvalho Chehab /* always return at least one empty line */
223b285192aSMauro Carvalho Chehab if (lines == 0) {
224b285192aSMauro Carvalho Chehab cx->vbi.sliced_data[0].id = 0;
225b285192aSMauro Carvalho Chehab cx->vbi.sliced_data[0].line = 0;
226b285192aSMauro Carvalho Chehab cx->vbi.sliced_data[0].field = 0;
227b285192aSMauro Carvalho Chehab lines = 1;
228b285192aSMauro Carvalho Chehab }
229b285192aSMauro Carvalho Chehab buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]);
230b285192aSMauro Carvalho Chehab memcpy(p, &cx->vbi.sliced_data[0], size);
231b285192aSMauro Carvalho Chehab
232b285192aSMauro Carvalho Chehab if (cx->vbi.insert_mpeg)
233b285192aSMauro Carvalho Chehab copy_vbi_data(cx, lines, pts);
234b285192aSMauro Carvalho Chehab cx->vbi.frame++;
235b285192aSMauro Carvalho Chehab }
236b285192aSMauro Carvalho Chehab
cx18_process_vbi_data(struct cx18 * cx,struct cx18_mdl * mdl,int streamtype)237b285192aSMauro Carvalho Chehab void cx18_process_vbi_data(struct cx18 *cx, struct cx18_mdl *mdl,
238b285192aSMauro Carvalho Chehab int streamtype)
239b285192aSMauro Carvalho Chehab {
240b285192aSMauro Carvalho Chehab struct cx18_buffer *buf;
241b285192aSMauro Carvalho Chehab u32 orig_used;
242b285192aSMauro Carvalho Chehab
243b285192aSMauro Carvalho Chehab if (streamtype != CX18_ENC_STREAM_TYPE_VBI)
244b285192aSMauro Carvalho Chehab return;
245b285192aSMauro Carvalho Chehab
246b285192aSMauro Carvalho Chehab /*
247b285192aSMauro Carvalho Chehab * Big assumption here:
248b285192aSMauro Carvalho Chehab * Every buffer hooked to the MDL's buf_list is a complete VBI frame
249b285192aSMauro Carvalho Chehab * that ends at the end of the buffer.
250b285192aSMauro Carvalho Chehab *
251b285192aSMauro Carvalho Chehab * To assume anything else would make the code in this file
252b285192aSMauro Carvalho Chehab * more complex, or require extra memcpy()'s to make the
253b285192aSMauro Carvalho Chehab * buffers satisfy the above assumption. It's just simpler to set
254b285192aSMauro Carvalho Chehab * up the encoder buffer transfers to make the assumption true.
255b285192aSMauro Carvalho Chehab */
256b285192aSMauro Carvalho Chehab list_for_each_entry(buf, &mdl->buf_list, list) {
257b285192aSMauro Carvalho Chehab orig_used = buf->bytesused;
258b285192aSMauro Carvalho Chehab if (orig_used == 0)
259b285192aSMauro Carvalho Chehab break;
260b285192aSMauro Carvalho Chehab _cx18_process_vbi_data(cx, buf);
261b285192aSMauro Carvalho Chehab mdl->bytesused -= (orig_used - buf->bytesused);
262b285192aSMauro Carvalho Chehab }
263b285192aSMauro Carvalho Chehab }
264