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 19 #include "cx18-driver.h" 20 #include "cx18-vbi.h" 21 #include "cx18-ioctl.h" 22 #include "cx18-queue.h" 23 24 /* 25 * Raster Reference/Protection (RP) bytes, used in Start/End Active 26 * Video codes emitted from the digitzer in VIP 1.x mode, that flag the start 27 * of VBI sample or VBI ancillary data regions in the digitial ratser line. 28 * 29 * Task FieldEven VerticalBlank HorizontalBlank 0 0 0 0 30 */ 31 static const u8 raw_vbi_sav_rp[2] = { 0x20, 0x60 }; /* __V_, _FV_ */ 32 static const u8 sliced_vbi_eav_rp[2] = { 0xb0, 0xf0 }; /* T_VH, TFVH */ 33 34 static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp) 35 { 36 int line = 0; 37 int i; 38 u32 linemask[2] = { 0, 0 }; 39 unsigned short size; 40 static const u8 mpeg_hdr_data[] = { 41 /* MPEG-2 Program Pack */ 42 0x00, 0x00, 0x01, 0xba, /* Prog Pack start code */ 43 0x44, 0x00, 0x0c, 0x66, 0x24, 0x01, /* SCR, SCR Ext, markers */ 44 0x01, 0xd1, 0xd3, /* Mux Rate, markers */ 45 0xfa, 0xff, 0xff, /* Res, Suff cnt, Stuff */ 46 /* MPEG-2 Private Stream 1 PES Packet */ 47 0x00, 0x00, 0x01, 0xbd, /* Priv Stream 1 start */ 48 0x00, 0x1a, /* length */ 49 0x84, 0x80, 0x07, /* flags, hdr data len */ 50 0x21, 0x00, 0x5d, 0x63, 0xa7, /* PTS, markers */ 51 0xff, 0xff /* stuffing */ 52 }; 53 const int sd = sizeof(mpeg_hdr_data); /* start of vbi data */ 54 int idx = cx->vbi.frame % CX18_VBI_FRAMES; 55 u8 *dst = &cx->vbi.sliced_mpeg_data[idx][0]; 56 57 for (i = 0; i < lines; i++) { 58 struct v4l2_sliced_vbi_data *sdata = cx->vbi.sliced_data + i; 59 int f, l; 60 61 if (sdata->id == 0) 62 continue; 63 64 l = sdata->line - 6; 65 f = sdata->field; 66 if (f) 67 l += 18; 68 if (l < 32) 69 linemask[0] |= (1 << l); 70 else 71 linemask[1] |= (1 << (l - 32)); 72 dst[sd + 12 + line * 43] = cx18_service2vbi(sdata->id); 73 memcpy(dst + sd + 12 + line * 43 + 1, sdata->data, 42); 74 line++; 75 } 76 memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data)); 77 if (line == 36) { 78 /* All lines are used, so there is no space for the linemask 79 (the max size of the VBI data is 36 * 43 + 4 bytes). 80 So in this case we use the magic number 'ITV0'. */ 81 memcpy(dst + sd, "ITV0", 4); 82 memmove(dst + sd + 4, dst + sd + 12, line * 43); 83 size = 4 + ((43 * line + 3) & ~3); 84 } else { 85 memcpy(dst + sd, "itv0", 4); 86 cpu_to_le32s(&linemask[0]); 87 cpu_to_le32s(&linemask[1]); 88 memcpy(dst + sd + 4, &linemask[0], 8); 89 size = 12 + ((43 * line + 3) & ~3); 90 } 91 dst[4+16] = (size + 10) >> 8; 92 dst[5+16] = (size + 10) & 0xff; 93 dst[9+16] = 0x21 | ((pts_stamp >> 29) & 0x6); 94 dst[10+16] = (pts_stamp >> 22) & 0xff; 95 dst[11+16] = 1 | ((pts_stamp >> 14) & 0xff); 96 dst[12+16] = (pts_stamp >> 7) & 0xff; 97 dst[13+16] = 1 | ((pts_stamp & 0x7f) << 1); 98 cx->vbi.sliced_mpeg_size[idx] = sd + size; 99 } 100 101 /* Compress raw VBI format, removes leading SAV codes and surplus space 102 after the frame. Returns new compressed size. */ 103 /* FIXME - this function ignores the input size. */ 104 static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size, u32 hdr_size) 105 { 106 u32 line_size = VBI_ACTIVE_SAMPLES; 107 u32 lines = cx->vbi.count * 2; 108 u8 *q = buf; 109 u8 *p; 110 int i; 111 112 /* Skip the header */ 113 buf += hdr_size; 114 115 for (i = 0; i < lines; i++) { 116 p = buf + i * line_size; 117 118 /* Look for SAV code */ 119 if (p[0] != 0xff || p[1] || p[2] || 120 (p[3] != raw_vbi_sav_rp[0] && 121 p[3] != raw_vbi_sav_rp[1])) 122 break; 123 if (i == lines - 1) { 124 /* last line is hdr_size bytes short - extrapolate it */ 125 memcpy(q, p + 4, line_size - 4 - hdr_size); 126 q += line_size - 4 - hdr_size; 127 p += line_size - hdr_size - 1; 128 memset(q, (int) *p, hdr_size); 129 } else { 130 memcpy(q, p + 4, line_size - 4); 131 q += line_size - 4; 132 } 133 } 134 return lines * (line_size - 4); 135 } 136 137 static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size, 138 const u32 hdr_size) 139 { 140 struct v4l2_decode_vbi_line vbi; 141 int i; 142 u32 line = 0; 143 u32 line_size = cx->is_60hz ? VBI_HBLANK_SAMPLES_60HZ 144 : VBI_HBLANK_SAMPLES_50HZ; 145 146 /* find the first valid line */ 147 for (i = hdr_size, buf += hdr_size; i < size; i++, buf++) { 148 if (buf[0] == 0xff && !buf[1] && !buf[2] && 149 (buf[3] == sliced_vbi_eav_rp[0] || 150 buf[3] == sliced_vbi_eav_rp[1])) 151 break; 152 } 153 154 /* 155 * The last line is short by hdr_size bytes, but for the remaining 156 * checks against size, we pretend that it is not, by counting the 157 * header bytes we knowingly skipped 158 */ 159 size -= (i - hdr_size); 160 if (size < line_size) 161 return line; 162 163 for (i = 0; i < size / line_size; i++) { 164 u8 *p = buf + i * line_size; 165 166 /* Look for EAV code */ 167 if (p[0] != 0xff || p[1] || p[2] || 168 (p[3] != sliced_vbi_eav_rp[0] && 169 p[3] != sliced_vbi_eav_rp[1])) 170 continue; 171 vbi.p = p + 4; 172 v4l2_subdev_call(cx->sd_av, vbi, decode_vbi_line, &vbi); 173 if (vbi.type) { 174 cx->vbi.sliced_data[line].id = vbi.type; 175 cx->vbi.sliced_data[line].field = vbi.is_second_field; 176 cx->vbi.sliced_data[line].line = vbi.line; 177 memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42); 178 line++; 179 } 180 } 181 return line; 182 } 183 184 static void _cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf) 185 { 186 /* 187 * The CX23418 provides a 12 byte header in its raw VBI buffers to us: 188 * 0x3fffffff [4 bytes of something] [4 byte presentation time stamp] 189 */ 190 struct vbi_data_hdr { 191 __be32 magic; 192 __be32 unknown; 193 __be32 pts; 194 } *hdr = (struct vbi_data_hdr *) buf->buf; 195 196 u8 *p = (u8 *) buf->buf; 197 u32 size = buf->bytesused; 198 u32 pts; 199 int lines; 200 201 /* 202 * The CX23418 sends us data that is 32 bit little-endian swapped, 203 * but we want the raw VBI bytes in the order they were in the raster 204 * line. This has a side effect of making the header big endian 205 */ 206 cx18_buf_swap(buf); 207 208 /* Raw VBI data */ 209 if (cx18_raw_vbi(cx)) { 210 211 size = buf->bytesused = 212 compress_raw_buf(cx, p, size, sizeof(struct vbi_data_hdr)); 213 214 /* 215 * Hack needed for compatibility with old VBI software. 216 * Write the frame # at the last 4 bytes of the frame 217 */ 218 p += size - 4; 219 memcpy(p, &cx->vbi.frame, 4); 220 cx->vbi.frame++; 221 return; 222 } 223 224 /* Sliced VBI data with data insertion */ 225 226 pts = (be32_to_cpu(hdr->magic) == 0x3fffffff) ? be32_to_cpu(hdr->pts) 227 : 0; 228 229 lines = compress_sliced_buf(cx, p, size, sizeof(struct vbi_data_hdr)); 230 231 /* always return at least one empty line */ 232 if (lines == 0) { 233 cx->vbi.sliced_data[0].id = 0; 234 cx->vbi.sliced_data[0].line = 0; 235 cx->vbi.sliced_data[0].field = 0; 236 lines = 1; 237 } 238 buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]); 239 memcpy(p, &cx->vbi.sliced_data[0], size); 240 241 if (cx->vbi.insert_mpeg) 242 copy_vbi_data(cx, lines, pts); 243 cx->vbi.frame++; 244 } 245 246 void cx18_process_vbi_data(struct cx18 *cx, struct cx18_mdl *mdl, 247 int streamtype) 248 { 249 struct cx18_buffer *buf; 250 u32 orig_used; 251 252 if (streamtype != CX18_ENC_STREAM_TYPE_VBI) 253 return; 254 255 /* 256 * Big assumption here: 257 * Every buffer hooked to the MDL's buf_list is a complete VBI frame 258 * that ends at the end of the buffer. 259 * 260 * To assume anything else would make the code in this file 261 * more complex, or require extra memcpy()'s to make the 262 * buffers satisfy the above assumption. It's just simpler to set 263 * up the encoder buffer transfers to make the assumption true. 264 */ 265 list_for_each_entry(buf, &mdl->buf_list, list) { 266 orig_used = buf->bytesused; 267 if (orig_used == 0) 268 break; 269 _cx18_process_vbi_data(cx, buf); 270 mdl->bytesused -= (orig_used - buf->bytesused); 271 } 272 } 273