1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * cx18 Vertical Blank Interval support functions 4 * 5 * Derived from ivtv-vbi.c 6 * 7 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> 8 */ 9 10#include "cx18-driver.h" 11#include "cx18-vbi.h" 12#include "cx18-ioctl.h" 13#include "cx18-queue.h" 14 15/* 16 * Raster Reference/Protection (RP) bytes, used in Start/End Active 17 * Video codes emitted from the digitzer in VIP 1.x mode, that flag the start 18 * of VBI sample or VBI ancillary data regions in the digital ratser line. 19 * 20 * Task FieldEven VerticalBlank HorizontalBlank 0 0 0 0 21 */ 22static const u8 raw_vbi_sav_rp[2] = { 0x20, 0x60 }; /* __V_, _FV_ */ 23static const u8 sliced_vbi_eav_rp[2] = { 0xb0, 0xf0 }; /* T_VH, TFVH */ 24 25static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp) 26{ 27 int line = 0; 28 int i; 29 u32 linemask[2] = { 0, 0 }; 30 unsigned short size; 31 static const u8 mpeg_hdr_data[] = { 32 /* MPEG-2 Program Pack */ 33 0x00, 0x00, 0x01, 0xba, /* Prog Pack start code */ 34 0x44, 0x00, 0x0c, 0x66, 0x24, 0x01, /* SCR, SCR Ext, markers */ 35 0x01, 0xd1, 0xd3, /* Mux Rate, markers */ 36 0xfa, 0xff, 0xff, /* Res, Suff cnt, Stuff */ 37 /* MPEG-2 Private Stream 1 PES Packet */ 38 0x00, 0x00, 0x01, 0xbd, /* Priv Stream 1 start */ 39 0x00, 0x1a, /* length */ 40 0x84, 0x80, 0x07, /* flags, hdr data len */ 41 0x21, 0x00, 0x5d, 0x63, 0xa7, /* PTS, markers */ 42 0xff, 0xff /* stuffing */ 43 }; 44 const int sd = sizeof(mpeg_hdr_data); /* start of vbi data */ 45 int idx = cx->vbi.frame % CX18_VBI_FRAMES; 46 u8 *dst = &cx->vbi.sliced_mpeg_data[idx][0]; 47 48 for (i = 0; i < lines; i++) { 49 struct v4l2_sliced_vbi_data *sdata = cx->vbi.sliced_data + i; 50 int f, l; 51 52 if (sdata->id == 0) 53 continue; 54 55 l = sdata->line - 6; 56 f = sdata->field; 57 if (f) 58 l += 18; 59 if (l < 32) 60 linemask[0] |= (1 << l); 61 else 62 linemask[1] |= (1 << (l - 32)); 63 dst[sd + 12 + line * 43] = cx18_service2vbi(sdata->id); 64 memcpy(dst + sd + 12 + line * 43 + 1, sdata->data, 42); 65 line++; 66 } 67 memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data)); 68 if (line == 36) { 69 /* All lines are used, so there is no space for the linemask 70 (the max size of the VBI data is 36 * 43 + 4 bytes). 71 So in this case we use the magic number 'ITV0'. */ 72 memcpy(dst + sd, "ITV0", 4); 73 memmove(dst + sd + 4, dst + sd + 12, line * 43); 74 size = 4 + ((43 * line + 3) & ~3); 75 } else { 76 memcpy(dst + sd, "itv0", 4); 77 cpu_to_le32s(&linemask[0]); 78 cpu_to_le32s(&linemask[1]); 79 memcpy(dst + sd + 4, &linemask[0], 8); 80 size = 12 + ((43 * line + 3) & ~3); 81 } 82 dst[4+16] = (size + 10) >> 8; 83 dst[5+16] = (size + 10) & 0xff; 84 dst[9+16] = 0x21 | ((pts_stamp >> 29) & 0x6); 85 dst[10+16] = (pts_stamp >> 22) & 0xff; 86 dst[11+16] = 1 | ((pts_stamp >> 14) & 0xff); 87 dst[12+16] = (pts_stamp >> 7) & 0xff; 88 dst[13+16] = 1 | ((pts_stamp & 0x7f) << 1); 89 cx->vbi.sliced_mpeg_size[idx] = sd + size; 90} 91 92/* Compress raw VBI format, removes leading SAV codes and surplus space 93 after the frame. Returns new compressed size. */ 94/* FIXME - this function ignores the input size. */ 95static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size, u32 hdr_size) 96{ 97 u32 line_size = VBI_ACTIVE_SAMPLES; 98 u32 lines = cx->vbi.count * 2; 99 u8 *q = buf; 100 u8 *p; 101 int i; 102 103 /* Skip the header */ 104 buf += hdr_size; 105 106 for (i = 0; i < lines; i++) { 107 p = buf + i * line_size; 108 109 /* Look for SAV code */ 110 if (p[0] != 0xff || p[1] || p[2] || 111 (p[3] != raw_vbi_sav_rp[0] && 112 p[3] != raw_vbi_sav_rp[1])) 113 break; 114 if (i == lines - 1) { 115 /* last line is hdr_size bytes short - extrapolate it */ 116 memcpy(q, p + 4, line_size - 4 - hdr_size); 117 q += line_size - 4 - hdr_size; 118 p += line_size - hdr_size - 1; 119 memset(q, (int) *p, hdr_size); 120 } else { 121 memcpy(q, p + 4, line_size - 4); 122 q += line_size - 4; 123 } 124 } 125 return lines * (line_size - 4); 126} 127 128static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size, 129 const u32 hdr_size) 130{ 131 struct v4l2_decode_vbi_line vbi; 132 int i; 133 u32 line = 0; 134 u32 line_size = cx->is_60hz ? VBI_HBLANK_SAMPLES_60HZ 135 : VBI_HBLANK_SAMPLES_50HZ; 136 137 /* find the first valid line */ 138 for (i = hdr_size, buf += hdr_size; i < size; i++, buf++) { 139 if (buf[0] == 0xff && !buf[1] && !buf[2] && 140 (buf[3] == sliced_vbi_eav_rp[0] || 141 buf[3] == sliced_vbi_eav_rp[1])) 142 break; 143 } 144 145 /* 146 * The last line is short by hdr_size bytes, but for the remaining 147 * checks against size, we pretend that it is not, by counting the 148 * header bytes we knowingly skipped 149 */ 150 size -= (i - hdr_size); 151 if (size < line_size) 152 return line; 153 154 for (i = 0; i < size / line_size; i++) { 155 u8 *p = buf + i * line_size; 156 157 /* Look for EAV code */ 158 if (p[0] != 0xff || p[1] || p[2] || 159 (p[3] != sliced_vbi_eav_rp[0] && 160 p[3] != sliced_vbi_eav_rp[1])) 161 continue; 162 vbi.p = p + 4; 163 v4l2_subdev_call(cx->sd_av, vbi, decode_vbi_line, &vbi); 164 if (vbi.type) { 165 cx->vbi.sliced_data[line].id = vbi.type; 166 cx->vbi.sliced_data[line].field = vbi.is_second_field; 167 cx->vbi.sliced_data[line].line = vbi.line; 168 memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42); 169 line++; 170 } 171 } 172 return line; 173} 174 175static void _cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf) 176{ 177 /* 178 * The CX23418 provides a 12 byte header in its raw VBI buffers to us: 179 * 0x3fffffff [4 bytes of something] [4 byte presentation time stamp] 180 */ 181 struct vbi_data_hdr { 182 __be32 magic; 183 __be32 unknown; 184 __be32 pts; 185 } *hdr = (struct vbi_data_hdr *) buf->buf; 186 187 u8 *p = (u8 *) buf->buf; 188 u32 size = buf->bytesused; 189 u32 pts; 190 int lines; 191 192 /* 193 * The CX23418 sends us data that is 32 bit little-endian swapped, 194 * but we want the raw VBI bytes in the order they were in the raster 195 * line. This has a side effect of making the header big endian 196 */ 197 cx18_buf_swap(buf); 198 199 /* Raw VBI data */ 200 if (cx18_raw_vbi(cx)) { 201 202 size = buf->bytesused = 203 compress_raw_buf(cx, p, size, sizeof(struct vbi_data_hdr)); 204 205 /* 206 * Hack needed for compatibility with old VBI software. 207 * Write the frame # at the last 4 bytes of the frame 208 */ 209 p += size - 4; 210 memcpy(p, &cx->vbi.frame, 4); 211 cx->vbi.frame++; 212 return; 213 } 214 215 /* Sliced VBI data with data insertion */ 216 217 pts = (be32_to_cpu(hdr->magic) == 0x3fffffff) ? be32_to_cpu(hdr->pts) 218 : 0; 219 220 lines = compress_sliced_buf(cx, p, size, sizeof(struct vbi_data_hdr)); 221 222 /* always return at least one empty line */ 223 if (lines == 0) { 224 cx->vbi.sliced_data[0].id = 0; 225 cx->vbi.sliced_data[0].line = 0; 226 cx->vbi.sliced_data[0].field = 0; 227 lines = 1; 228 } 229 buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]); 230 memcpy(p, &cx->vbi.sliced_data[0], size); 231 232 if (cx->vbi.insert_mpeg) 233 copy_vbi_data(cx, lines, pts); 234 cx->vbi.frame++; 235} 236 237void cx18_process_vbi_data(struct cx18 *cx, struct cx18_mdl *mdl, 238 int streamtype) 239{ 240 struct cx18_buffer *buf; 241 u32 orig_used; 242 243 if (streamtype != CX18_ENC_STREAM_TYPE_VBI) 244 return; 245 246 /* 247 * Big assumption here: 248 * Every buffer hooked to the MDL's buf_list is a complete VBI frame 249 * that ends at the end of the buffer. 250 * 251 * To assume anything else would make the code in this file 252 * more complex, or require extra memcpy()'s to make the 253 * buffers satisfy the above assumption. It's just simpler to set 254 * up the encoder buffer transfers to make the assumption true. 255 */ 256 list_for_each_entry(buf, &mdl->buf_list, list) { 257 orig_used = buf->bytesused; 258 if (orig_used == 0) 259 break; 260 _cx18_process_vbi_data(cx, buf); 261 mdl->bytesused -= (orig_used - buf->bytesused); 262 } 263} 264