| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * DVB subtitle encoding | ||
| 3 | * Copyright (c) 2005 Fabrice Bellard | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | #include "avcodec.h" | ||
| 22 | #include "bytestream.h" | ||
| 23 | #include "codec_internal.h" | ||
| 24 | #include "libavutil/colorspace.h" | ||
| 25 | #include "libavutil/opt.h" | ||
| 26 | |||
| 27 | typedef struct DVBSubtitleContext { | ||
| 28 | AVClass * class; | ||
| 29 | int object_version; | ||
| 30 | int min_bpp; | ||
| 31 | } DVBSubtitleContext; | ||
| 32 | |||
| 33 | #define PUTBITS2(val)\ | ||
| 34 | {\ | ||
| 35 | bitbuf |= (val) << bitcnt;\ | ||
| 36 | bitcnt -= 2;\ | ||
| 37 | if (bitcnt < 0) {\ | ||
| 38 | bitcnt = 6;\ | ||
| 39 | *q++ = bitbuf;\ | ||
| 40 | bitbuf = 0;\ | ||
| 41 | }\ | ||
| 42 | } | ||
| 43 | |||
| 44 | ✗ | static int dvb_encode_rle2(uint8_t **pq, int buf_size, | |
| 45 | const uint8_t *bitmap, int linesize, | ||
| 46 | int w, int h) | ||
| 47 | { | ||
| 48 | uint8_t *q, *line_begin; | ||
| 49 | unsigned int bitbuf; | ||
| 50 | int bitcnt; | ||
| 51 | int x, y, len, x1, v, color; | ||
| 52 | |||
| 53 | ✗ | q = *pq; | |
| 54 | |||
| 55 | ✗ | for(y = 0; y < h; y++) { | |
| 56 | // Worst case line is 3 bits per value + 4 bytes overhead | ||
| 57 | ✗ | if (buf_size * 8 < w * 3 + 32) | |
| 58 | ✗ | return AVERROR_BUFFER_TOO_SMALL; | |
| 59 | ✗ | line_begin = q; | |
| 60 | ✗ | *q++ = 0x10; | |
| 61 | ✗ | bitbuf = 0; | |
| 62 | ✗ | bitcnt = 6; | |
| 63 | |||
| 64 | ✗ | x = 0; | |
| 65 | ✗ | while (x < w) { | |
| 66 | ✗ | x1 = x; | |
| 67 | ✗ | color = bitmap[x1++]; | |
| 68 | ✗ | while (x1 < w && bitmap[x1] == color) | |
| 69 | ✗ | x1++; | |
| 70 | ✗ | len = x1 - x; | |
| 71 | ✗ | if (color == 0 && len == 2) { | |
| 72 | ✗ | PUTBITS2(0); | |
| 73 | ✗ | PUTBITS2(0); | |
| 74 | ✗ | PUTBITS2(1); | |
| 75 | ✗ | } else if (len >= 3 && len <= 10) { | |
| 76 | ✗ | v = len - 3; | |
| 77 | ✗ | PUTBITS2(0); | |
| 78 | ✗ | PUTBITS2((v >> 2) | 2); | |
| 79 | ✗ | PUTBITS2(v & 3); | |
| 80 | ✗ | PUTBITS2(color); | |
| 81 | ✗ | } else if (len >= 12 && len <= 27) { | |
| 82 | ✗ | v = len - 12; | |
| 83 | ✗ | PUTBITS2(0); | |
| 84 | ✗ | PUTBITS2(0); | |
| 85 | ✗ | PUTBITS2(2); | |
| 86 | ✗ | PUTBITS2(v >> 2); | |
| 87 | ✗ | PUTBITS2(v & 3); | |
| 88 | ✗ | PUTBITS2(color); | |
| 89 | ✗ | } else if (len >= 29) { | |
| 90 | /* length = 29 ... 284 */ | ||
| 91 | ✗ | if (len > 284) | |
| 92 | ✗ | len = 284; | |
| 93 | ✗ | v = len - 29; | |
| 94 | ✗ | PUTBITS2(0); | |
| 95 | ✗ | PUTBITS2(0); | |
| 96 | ✗ | PUTBITS2(3); | |
| 97 | ✗ | PUTBITS2((v >> 6)); | |
| 98 | ✗ | PUTBITS2((v >> 4) & 3); | |
| 99 | ✗ | PUTBITS2((v >> 2) & 3); | |
| 100 | ✗ | PUTBITS2(v & 3); | |
| 101 | ✗ | PUTBITS2(color); | |
| 102 | } else { | ||
| 103 | ✗ | PUTBITS2(color); | |
| 104 | ✗ | if (color == 0) { | |
| 105 | ✗ | PUTBITS2(1); | |
| 106 | } | ||
| 107 | ✗ | len = 1; | |
| 108 | } | ||
| 109 | ✗ | x += len; | |
| 110 | } | ||
| 111 | /* end of line */ | ||
| 112 | ✗ | PUTBITS2(0); | |
| 113 | ✗ | PUTBITS2(0); | |
| 114 | ✗ | PUTBITS2(0); | |
| 115 | ✗ | if (bitcnt != 6) { | |
| 116 | ✗ | *q++ = bitbuf; | |
| 117 | } | ||
| 118 | ✗ | *q++ = 0xf0; | |
| 119 | ✗ | bitmap += linesize; | |
| 120 | ✗ | buf_size -= q - line_begin; | |
| 121 | } | ||
| 122 | ✗ | len = q - *pq; | |
| 123 | ✗ | *pq = q; | |
| 124 | ✗ | return len; | |
| 125 | } | ||
| 126 | |||
| 127 | #define PUTBITS4(val)\ | ||
| 128 | {\ | ||
| 129 | bitbuf |= (val) << bitcnt;\ | ||
| 130 | bitcnt -= 4;\ | ||
| 131 | if (bitcnt < 0) {\ | ||
| 132 | bitcnt = 4;\ | ||
| 133 | *q++ = bitbuf;\ | ||
| 134 | bitbuf = 0;\ | ||
| 135 | }\ | ||
| 136 | } | ||
| 137 | |||
| 138 | /* some DVB decoders only implement 4 bits/pixel */ | ||
| 139 | 132 | static int dvb_encode_rle4(uint8_t **pq, int buf_size, | |
| 140 | const uint8_t *bitmap, int linesize, | ||
| 141 | int w, int h) | ||
| 142 | { | ||
| 143 | uint8_t *q, *line_begin; | ||
| 144 | unsigned int bitbuf; | ||
| 145 | int bitcnt; | ||
| 146 | int x, y, len, x1, v, color; | ||
| 147 | |||
| 148 | 132 | q = *pq; | |
| 149 | |||
| 150 |
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2508 | for(y = 0; y < h; y++) { |
| 151 | // Worst case line is 6 bits per value, + 4 bytes overhead | ||
| 152 |
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2376 | if (buf_size * 8 < w * 6 + 32) |
| 153 | ✗ | return AVERROR_BUFFER_TOO_SMALL; | |
| 154 | 2376 | line_begin = q; | |
| 155 | 2376 | *q++ = 0x11; | |
| 156 | 2376 | bitbuf = 0; | |
| 157 | 2376 | bitcnt = 4; | |
| 158 | |||
| 159 | 2376 | x = 0; | |
| 160 |
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256530 | while (x < w) { |
| 161 | 254154 | x1 = x; | |
| 162 | 254154 | color = bitmap[x1++]; | |
| 163 |
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1992511 | while (x1 < w && bitmap[x1] == color) |
| 164 | 1738357 | x1++; | |
| 165 | 254154 | len = x1 - x; | |
| 166 |
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254154 | if (color == 0 && len == 2) { |
| 167 | ✗ | PUTBITS4(0); | |
| 168 | ✗ | PUTBITS4(0xd); | |
| 169 |
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254154 | } else if (color == 0 && (len >= 3 && len <= 9)) { |
| 170 |
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36 | PUTBITS4(0); |
| 171 |
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36 | PUTBITS4(len - 2); |
| 172 |
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254118 | } else if (len >= 4 && len <= 7) { |
| 173 |
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18199 | PUTBITS4(0); |
| 174 |
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18199 | PUTBITS4(8 + len - 4); |
| 175 |
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18199 | PUTBITS4(color); |
| 176 |
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235919 | } else if (len >= 9 && len <= 24) { |
| 177 |
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7926 | PUTBITS4(0); |
| 178 |
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7926 | PUTBITS4(0xe); |
| 179 |
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7926 | PUTBITS4(len - 9); |
| 180 |
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7926 | PUTBITS4(color); |
| 181 |
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227993 | } else if (len >= 25) { |
| 182 |
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9232 | if (len > 280) |
| 183 | 1469 | len = 280; | |
| 184 | 9232 | v = len - 25; | |
| 185 |
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9232 | PUTBITS4(0); |
| 186 |
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9232 | PUTBITS4(0xf); |
| 187 |
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9232 | PUTBITS4(v >> 4); |
| 188 |
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9232 | PUTBITS4(v & 0xf); |
| 189 |
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9232 | PUTBITS4(color); |
| 190 | } else { | ||
| 191 |
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218761 | PUTBITS4(color); |
| 192 |
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218761 | if (color == 0) { |
| 193 | ✗ | PUTBITS4(0xc); | |
| 194 | } | ||
| 195 | 218761 | len = 1; | |
| 196 | } | ||
| 197 | 254154 | x += len; | |
| 198 | } | ||
| 199 | /* end of line */ | ||
| 200 |
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2376 | PUTBITS4(0); |
| 201 |
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2376 | PUTBITS4(0); |
| 202 |
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2376 | if (bitcnt != 4) { |
| 203 | 1024 | *q++ = bitbuf; | |
| 204 | } | ||
| 205 | 2376 | *q++ = 0xf0; | |
| 206 | 2376 | bitmap += linesize; | |
| 207 | 2376 | buf_size -= q - line_begin; | |
| 208 | } | ||
| 209 | 132 | len = q - *pq; | |
| 210 | 132 | *pq = q; | |
| 211 | 132 | return len; | |
| 212 | } | ||
| 213 | |||
| 214 | ✗ | static int dvb_encode_rle8(uint8_t **pq, int buf_size, | |
| 215 | const uint8_t *bitmap, int linesize, | ||
| 216 | int w, int h) | ||
| 217 | { | ||
| 218 | uint8_t *q, *line_begin; | ||
| 219 | int x, y, len, x1, color; | ||
| 220 | |||
| 221 | ✗ | q = *pq; | |
| 222 | |||
| 223 | ✗ | for (y = 0; y < h; y++) { | |
| 224 | // Worst case line is 12 bits per value, + 3 bytes overhead | ||
| 225 | ✗ | if (buf_size * 8 < w * 12 + 24) | |
| 226 | ✗ | return AVERROR_BUFFER_TOO_SMALL; | |
| 227 | ✗ | line_begin = q; | |
| 228 | ✗ | *q++ = 0x12; | |
| 229 | |||
| 230 | ✗ | x = 0; | |
| 231 | ✗ | while (x < w) { | |
| 232 | ✗ | x1 = x; | |
| 233 | ✗ | color = bitmap[x1++]; | |
| 234 | ✗ | while (x1 < w && bitmap[x1] == color) | |
| 235 | ✗ | x1++; | |
| 236 | ✗ | len = x1 - x; | |
| 237 | ✗ | if (len == 1 && color) { | |
| 238 | // 00000001 to 11111111 1 pixel in colour x | ||
| 239 | ✗ | *q++ = color; | |
| 240 | } else { | ||
| 241 | ✗ | if (color == 0x00) { | |
| 242 | // 00000000 0LLLLLLL L pixels (1-127) in colour 0 (L > 0) | ||
| 243 | ✗ | len = FFMIN(len, 127); | |
| 244 | ✗ | *q++ = 0x00; | |
| 245 | ✗ | *q++ = len; | |
| 246 | ✗ | } else if (len > 2) { | |
| 247 | // 00000000 1LLLLLLL CCCCCCCC L pixels (3-127) in colour C (L > 2) | ||
| 248 | ✗ | len = FFMIN(len, 127); | |
| 249 | ✗ | *q++ = 0x00; | |
| 250 | ✗ | *q++ = 0x80+len; | |
| 251 | ✗ | *q++ = color; | |
| 252 | } | ||
| 253 | ✗ | else if (len == 2) { | |
| 254 | ✗ | *q++ = color; | |
| 255 | ✗ | *q++ = color; | |
| 256 | } else { | ||
| 257 | ✗ | *q++ = color; | |
| 258 | ✗ | len = 1; | |
| 259 | } | ||
| 260 | } | ||
| 261 | ✗ | x += len; | |
| 262 | } | ||
| 263 | /* end of line */ | ||
| 264 | // 00000000 00000000 end of 8-bit/pixel_code_string | ||
| 265 | ✗ | *q++ = 0x00; | |
| 266 | ✗ | *q++ = 0x00; | |
| 267 | ✗ | *q++ = 0xf0; | |
| 268 | ✗ | bitmap += linesize; | |
| 269 | ✗ | buf_size -= q - line_begin; | |
| 270 | } | ||
| 271 | ✗ | len = q - *pq; | |
| 272 | ✗ | *pq = q; | |
| 273 | ✗ | return len; | |
| 274 | } | ||
| 275 | |||
| 276 | 72 | static int dvbsub_encode(AVCodecContext *avctx, uint8_t *outbuf, int buf_size, | |
| 277 | const AVSubtitle *h) | ||
| 278 | { | ||
| 279 | 72 | DVBSubtitleContext *s = avctx->priv_data; | |
| 280 | uint8_t *q, *pseg_len; | ||
| 281 | int page_id, region_id, clut_id, object_id, i, bpp_index, page_state, min_colors; | ||
| 282 | |||
| 283 | |||
| 284 | 72 | q = outbuf; | |
| 285 | |||
| 286 | 72 | page_id = 1; | |
| 287 | |||
| 288 |
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72 | switch(s->min_bpp) { |
| 289 | 72 | case 2: | |
| 290 | case 4: | ||
| 291 | case 8: | ||
| 292 | 72 | min_colors = 1 << s->min_bpp; | |
| 293 | 72 | break; | |
| 294 | ✗ | default: | |
| 295 | ✗ | av_log(avctx, AV_LOG_ERROR, "Invalid min_bpp value %d.\n", s->min_bpp); | |
| 296 | ✗ | return AVERROR(EINVAL); | |
| 297 | } | ||
| 298 | |||
| 299 |
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72 | if (h->num_rects && !h->rects) |
| 300 | ✗ | return AVERROR(EINVAL); | |
| 301 | |||
| 302 |
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72 | if (h->num_rects >= 256) |
| 303 | ✗ | return AVERROR(EINVAL); | |
| 304 | |||
| 305 |
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72 | if (avctx->width > 0 && avctx->height > 0) { |
| 306 | ✗ | if (buf_size < 11) | |
| 307 | ✗ | return AVERROR_BUFFER_TOO_SMALL; | |
| 308 | /* display definition segment */ | ||
| 309 | ✗ | *q++ = 0x0f; /* sync_byte */ | |
| 310 | ✗ | *q++ = 0x14; /* segment_type */ | |
| 311 | ✗ | bytestream_put_be16(&q, page_id); | |
| 312 | ✗ | pseg_len = q; | |
| 313 | ✗ | q += 2; /* segment length */ | |
| 314 | ✗ | *q++ = 0x00; /* dds version number & display window flag */ | |
| 315 | ✗ | bytestream_put_be16(&q, avctx->width - 1); /* display width */ | |
| 316 | ✗ | bytestream_put_be16(&q, avctx->height - 1); /* display height */ | |
| 317 | ✗ | bytestream_put_be16(&pseg_len, q - pseg_len - 2); | |
| 318 | ✗ | buf_size -= 11; | |
| 319 | } | ||
| 320 | |||
| 321 | /* page composition segment */ | ||
| 322 | |||
| 323 |
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72 | if (buf_size < 8 + h->num_rects * 6) |
| 324 | ✗ | return AVERROR_BUFFER_TOO_SMALL; | |
| 325 | 72 | *q++ = 0x0f; /* sync_byte */ | |
| 326 | 72 | *q++ = 0x10; /* segment_type */ | |
| 327 | 72 | bytestream_put_be16(&q, page_id); | |
| 328 | 72 | pseg_len = q; | |
| 329 | 72 | q += 2; /* segment length */ | |
| 330 | 72 | *q++ = 30; /* page_timeout (seconds) */ | |
| 331 | 72 | page_state = 2; /* mode change */ | |
| 332 | /* page_version = 0 + page_state */ | ||
| 333 | 72 | *q++ = (s->object_version << 4) | (page_state << 2) | 3; | |
| 334 | |||
| 335 |
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138 | for (region_id = 0; region_id < h->num_rects; region_id++) { |
| 336 | 66 | *q++ = region_id; | |
| 337 | 66 | *q++ = 0xff; /* reserved */ | |
| 338 | 66 | bytestream_put_be16(&q, h->rects[region_id]->x); /* left pos */ | |
| 339 | 66 | bytestream_put_be16(&q, h->rects[region_id]->y); /* top pos */ | |
| 340 | } | ||
| 341 | |||
| 342 | 72 | bytestream_put_be16(&pseg_len, q - pseg_len - 2); | |
| 343 | 72 | buf_size -= 8 + h->num_rects * 6; | |
| 344 | |||
| 345 |
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72 | if (h->num_rects) { |
| 346 |
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102 | for (clut_id = 0; clut_id < h->num_rects; clut_id++) { |
| 347 | /* CLUT segment */ | ||
| 348 | 66 | int nb_colors = FFMAX(min_colors, h->rects[clut_id]->nb_colors); | |
| 349 | |||
| 350 |
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66 | if (nb_colors <= 4U) { |
| 351 | /* 2 bpp, some decoders do not support it correctly */ | ||
| 352 | ✗ | bpp_index = 0; | |
| 353 |
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66 | } else if (nb_colors <= 16U) { |
| 354 | /* 4 bpp, standard encoding */ | ||
| 355 | 66 | bpp_index = 1; | |
| 356 | ✗ | } else if (nb_colors <= 256U) { | |
| 357 | /* 8 bpp, standard encoding */ | ||
| 358 | ✗ | bpp_index = 2; | |
| 359 | } else { | ||
| 360 | ✗ | return AVERROR(EINVAL); | |
| 361 | } | ||
| 362 | |||
| 363 |
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66 | if (buf_size < 6 + h->rects[clut_id]->nb_colors * 6) |
| 364 | ✗ | return AVERROR_BUFFER_TOO_SMALL; | |
| 365 | |||
| 366 | /* CLUT segment */ | ||
| 367 | 66 | *q++ = 0x0f; /* sync byte */ | |
| 368 | 66 | *q++ = 0x12; /* CLUT definition segment */ | |
| 369 | 66 | bytestream_put_be16(&q, page_id); | |
| 370 | 66 | pseg_len = q; | |
| 371 | 66 | q += 2; /* segment length */ | |
| 372 | 66 | *q++ = clut_id; | |
| 373 | 66 | *q++ = (0 << 4) | 0xf; /* version = 0 */ | |
| 374 | |||
| 375 |
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1122 | for(i = 0; i < h->rects[clut_id]->nb_colors; i++) { |
| 376 | 1056 | *q++ = i; /* clut_entry_id */ | |
| 377 | 1056 | *q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */ | |
| 378 | { | ||
| 379 | int a, r, g, b; | ||
| 380 | 1056 | uint32_t x= ((uint32_t*)h->rects[clut_id]->data[1])[i]; | |
| 381 | 1056 | a = (x >> 24) & 0xff; | |
| 382 | 1056 | r = (x >> 16) & 0xff; | |
| 383 | 1056 | g = (x >> 8) & 0xff; | |
| 384 | 1056 | b = (x >> 0) & 0xff; | |
| 385 | |||
| 386 | 1056 | *q++ = RGB_TO_Y_CCIR(r, g, b); | |
| 387 | 1056 | *q++ = RGB_TO_V_CCIR(r, g, b, 0); | |
| 388 | 1056 | *q++ = RGB_TO_U_CCIR(r, g, b, 0); | |
| 389 | 1056 | *q++ = 255 - a; | |
| 390 | } | ||
| 391 | } | ||
| 392 | |||
| 393 | 66 | bytestream_put_be16(&pseg_len, q - pseg_len - 2); | |
| 394 | 66 | buf_size -= 6 + h->rects[clut_id]->nb_colors * 6; | |
| 395 | } | ||
| 396 | |||
| 397 |
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36 | if (buf_size < h->num_rects * 22) |
| 398 | ✗ | return AVERROR_BUFFER_TOO_SMALL; | |
| 399 |
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102 | for (region_id = 0; region_id < h->num_rects; region_id++) { |
| 400 | |||
| 401 | /* region composition segment */ | ||
| 402 | 66 | int nb_colors = FFMAX(min_colors, h->rects[region_id]->nb_colors); | |
| 403 | |||
| 404 |
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66 | if (nb_colors <= 4) { |
| 405 | /* 2 bpp, some decoders do not support it correctly */ | ||
| 406 | ✗ | bpp_index = 0; | |
| 407 |
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66 | } else if (nb_colors <= 16) { |
| 408 | /* 4 bpp, standard encoding */ | ||
| 409 | 66 | bpp_index = 1; | |
| 410 | ✗ | } else if (nb_colors <= 256) { | |
| 411 | /* 8 bpp, standard encoding */ | ||
| 412 | ✗ | bpp_index = 2; | |
| 413 | } else { | ||
| 414 | ✗ | return AVERROR(EINVAL); | |
| 415 | } | ||
| 416 | |||
| 417 | 66 | *q++ = 0x0f; /* sync_byte */ | |
| 418 | 66 | *q++ = 0x11; /* segment_type */ | |
| 419 | 66 | bytestream_put_be16(&q, page_id); | |
| 420 | 66 | pseg_len = q; | |
| 421 | 66 | q += 2; /* segment length */ | |
| 422 | 66 | *q++ = region_id; | |
| 423 | 66 | *q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */ | |
| 424 | 66 | bytestream_put_be16(&q, h->rects[region_id]->w); /* region width */ | |
| 425 | 66 | bytestream_put_be16(&q, h->rects[region_id]->h); /* region height */ | |
| 426 | 66 | *q++ = ((1 + bpp_index) << 5) | ((1 + bpp_index) << 2) | 0x03; | |
| 427 | 66 | *q++ = region_id; /* clut_id == region_id */ | |
| 428 | 66 | *q++ = 0; /* 8 bit fill colors */ | |
| 429 | 66 | *q++ = 0x03; /* 4 bit and 2 bit fill colors */ | |
| 430 | |||
| 431 | 66 | bytestream_put_be16(&q, region_id); /* object_id == region_id */ | |
| 432 | 66 | *q++ = (0 << 6) | (0 << 4); | |
| 433 | 66 | *q++ = 0; | |
| 434 | 66 | *q++ = 0xf0; | |
| 435 | 66 | *q++ = 0; | |
| 436 | |||
| 437 | 66 | bytestream_put_be16(&pseg_len, q - pseg_len - 2); | |
| 438 | } | ||
| 439 | 36 | buf_size -= h->num_rects * 22; | |
| 440 | |||
| 441 |
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102 | for (object_id = 0; object_id < h->num_rects; object_id++) { |
| 442 | int (*dvb_encode_rle)(uint8_t **pq, int buf_size, | ||
| 443 | const uint8_t *bitmap, int linesize, | ||
| 444 | int w, int h); | ||
| 445 | |||
| 446 | 66 | int nb_colors = FFMAX(min_colors, h->rects[object_id]->nb_colors); | |
| 447 | |||
| 448 |
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66 | if (buf_size < 13) |
| 449 | ✗ | return AVERROR_BUFFER_TOO_SMALL; | |
| 450 | |||
| 451 | /* bpp_index maths */ | ||
| 452 |
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66 | if (nb_colors <= 4) { |
| 453 | /* 2 bpp, some decoders do not support it correctly */ | ||
| 454 | ✗ | dvb_encode_rle = dvb_encode_rle2; | |
| 455 |
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66 | } else if (nb_colors <= 16) { |
| 456 | /* 4 bpp, standard encoding */ | ||
| 457 | 66 | dvb_encode_rle = dvb_encode_rle4; | |
| 458 | ✗ | } else if (nb_colors <= 256) { | |
| 459 | /* 8 bpp, standard encoding */ | ||
| 460 | ✗ | dvb_encode_rle = dvb_encode_rle8; | |
| 461 | } else { | ||
| 462 | ✗ | return AVERROR(EINVAL); | |
| 463 | } | ||
| 464 | |||
| 465 | /* Object Data segment */ | ||
| 466 | 66 | *q++ = 0x0f; /* sync byte */ | |
| 467 | 66 | *q++ = 0x13; | |
| 468 | 66 | bytestream_put_be16(&q, page_id); | |
| 469 | 66 | pseg_len = q; | |
| 470 | 66 | q += 2; /* segment length */ | |
| 471 | |||
| 472 | 66 | bytestream_put_be16(&q, object_id); | |
| 473 | 66 | *q++ = (s->object_version << 4) | (0 << 2) | (0 << 1) | 1; /* version = 0, | |
| 474 | object_coding_method, | ||
| 475 | non_modifying_color_flag */ | ||
| 476 | { | ||
| 477 | uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr; | ||
| 478 | int ret; | ||
| 479 | |||
| 480 | 66 | ptop_field_len = q; | |
| 481 | 66 | q += 2; | |
| 482 | 66 | pbottom_field_len = q; | |
| 483 | 66 | q += 2; | |
| 484 | 66 | buf_size -= 13; | |
| 485 | |||
| 486 | 66 | top_ptr = q; | |
| 487 | 66 | ret = dvb_encode_rle(&q, buf_size, | |
| 488 | 66 | h->rects[object_id]->data[0], | |
| 489 | 66 | h->rects[object_id]->w * 2, | |
| 490 | 66 | h->rects[object_id]->w, | |
| 491 | 66 | h->rects[object_id]->h >> 1); | |
| 492 |
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66 | if (ret < 0) |
| 493 | ✗ | return ret; | |
| 494 | 66 | buf_size -= ret; | |
| 495 | 66 | bottom_ptr = q; | |
| 496 | 66 | ret = dvb_encode_rle(&q, buf_size, | |
| 497 | 66 | h->rects[object_id]->data[0] + h->rects[object_id]->w, | |
| 498 | 66 | h->rects[object_id]->w * 2, | |
| 499 | 66 | h->rects[object_id]->w, | |
| 500 | 66 | h->rects[object_id]->h >> 1); | |
| 501 |
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66 | if (ret < 0) |
| 502 | ✗ | return ret; | |
| 503 | 66 | buf_size -= ret; | |
| 504 | |||
| 505 | 66 | bytestream_put_be16(&ptop_field_len, bottom_ptr - top_ptr); | |
| 506 | 66 | bytestream_put_be16(&pbottom_field_len, q - bottom_ptr); | |
| 507 | } | ||
| 508 | |||
| 509 | 66 | bytestream_put_be16(&pseg_len, q - pseg_len - 2); | |
| 510 | } | ||
| 511 | } | ||
| 512 | |||
| 513 | /* end of display set segment */ | ||
| 514 | |||
| 515 |
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72 | if (buf_size < 6) |
| 516 | ✗ | return AVERROR_BUFFER_TOO_SMALL; | |
| 517 | 72 | *q++ = 0x0f; /* sync_byte */ | |
| 518 | 72 | *q++ = 0x80; /* segment_type */ | |
| 519 | 72 | bytestream_put_be16(&q, page_id); | |
| 520 | 72 | pseg_len = q; | |
| 521 | 72 | q += 2; /* segment length */ | |
| 522 | |||
| 523 | 72 | bytestream_put_be16(&pseg_len, q - pseg_len - 2); | |
| 524 | 72 | buf_size -= 6; | |
| 525 | |||
| 526 | 72 | s->object_version = (s->object_version + 1) & 0xf; | |
| 527 | 72 | return q - outbuf; | |
| 528 | } | ||
| 529 | |||
| 530 | #define OFFSET(x) offsetof(DVBSubtitleContext, x) | ||
| 531 | #define SE AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_ENCODING_PARAM | ||
| 532 | static const AVOption options[] = { | ||
| 533 | {"min_bpp", "minimum bits-per-pixel for subtitle colors (2, 4 or 8)", OFFSET(min_bpp), AV_OPT_TYPE_INT, {.i64 = 4}, 2, 8, SE}, | ||
| 534 | { NULL }, | ||
| 535 | }; | ||
| 536 | |||
| 537 | static const AVClass dvbsubenc_class = { | ||
| 538 | .class_name = "DVBSUB subtitle encoder", | ||
| 539 | .item_name = av_default_item_name, | ||
| 540 | .option = options, | ||
| 541 | .version = LIBAVUTIL_VERSION_INT, | ||
| 542 | }; | ||
| 543 | |||
| 544 | const FFCodec ff_dvbsub_encoder = { | ||
| 545 | .p.name = "dvbsub", | ||
| 546 | CODEC_LONG_NAME("DVB subtitles"), | ||
| 547 | .p.type = AVMEDIA_TYPE_SUBTITLE, | ||
| 548 | .p.id = AV_CODEC_ID_DVB_SUBTITLE, | ||
| 549 | .priv_data_size = sizeof(DVBSubtitleContext), | ||
| 550 | FF_CODEC_ENCODE_SUB_CB(dvbsub_encode), | ||
| 551 | .p.priv_class = &dvbsubenc_class, | ||
| 552 | }; | ||
| 553 |