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 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. */ 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 } 141 142 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 } 188 189 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 } 250 251 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