| 1 | /* |
| 2 | * DVD subtitle decoding |
| 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 | |
| 22 | #include "avcodec.h" |
| 23 | #include "get_bits.h" |
| 24 | #include "internal.h" |
| 25 | |
| 26 | #include "libavutil/attributes.h" |
| 27 | #include "libavutil/colorspace.h" |
| 28 | #include "libavutil/opt.h" |
| 29 | #include "libavutil/imgutils.h" |
| 30 | #include "libavutil/avstring.h" |
| 31 | |
| 32 | typedef struct DVDSubContext |
| 33 | { |
| 34 | AVClass *class; |
| 35 | uint32_t palette[16]; |
| 36 | char *palette_str; |
| 37 | int has_palette; |
| 38 | uint8_t colormap[4]; |
| 39 | uint8_t alpha[256]; |
| 40 | uint8_t *buf; |
| 41 | int buf_size; |
| 42 | #ifdef DEBUG |
| 43 | int sub_id; |
| 44 | #endif |
| 45 | } DVDSubContext; |
| 46 | |
| 47 | static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values) |
| 48 | { |
| 49 | const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP; |
| 50 | uint8_t r, g, b; |
| 51 | int i, y, cb, cr; |
| 52 | int r_add, g_add, b_add; |
| 53 | |
| 54 | for (i = num_values; i > 0; i--) { |
| 55 | y = *ycbcr++; |
| 56 | cr = *ycbcr++; |
| 57 | cb = *ycbcr++; |
| 58 | YUV_TO_RGB1_CCIR(cb, cr); |
| 59 | YUV_TO_RGB2_CCIR(r, g, b, y); |
| 60 | *rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | static int decode_run_2bit(GetBitContext *gb, int *color) |
| 65 | { |
| 66 | unsigned int v, t; |
| 67 | |
| 68 | v = 0; |
| 69 | for (t = 1; v < t && t <= 0x40; t <<= 2) |
| 70 | v = (v << 4) | get_bits(gb, 4); |
| 71 | *color = v & 3; |
| 72 | if (v < 4) { /* Code for fill rest of line */ |
| 73 | return INT_MAX; |
| 74 | } |
| 75 | return v >> 2; |
| 76 | } |
| 77 | |
| 78 | static int decode_run_8bit(GetBitContext *gb, int *color) |
| 79 | { |
| 80 | int len; |
| 81 | int has_run = get_bits1(gb); |
| 82 | if (get_bits1(gb)) |
| 83 | *color = get_bits(gb, 8); |
| 84 | else |
| 85 | *color = get_bits(gb, 2); |
| 86 | if (has_run) { |
| 87 | if (get_bits1(gb)) { |
| 88 | len = get_bits(gb, 7); |
| 89 | if (len == 0) |
| 90 | len = INT_MAX; |
| 91 | else |
| 92 | len += 9; |
| 93 | } else |
| 94 | len = get_bits(gb, 3) + 2; |
| 95 | } else |
| 96 | len = 1; |
| 97 | return len; |
| 98 | } |
| 99 | |
| 100 | static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, |
| 101 | const uint8_t *buf, int start, int buf_size, int is_8bit) |
| 102 | { |
| 103 | GetBitContext gb; |
| 104 | int bit_len; |
| 105 | int x, y, len, color; |
| 106 | uint8_t *d; |
| 107 | |
| 108 | bit_len = (buf_size - start) * 8; |
| 109 | init_get_bits(&gb, buf + start, bit_len); |
| 110 | |
| 111 | x = 0; |
| 112 | y = 0; |
| 113 | d = bitmap; |
| 114 | for(;;) { |
| 115 | if (get_bits_count(&gb) > bit_len) |
| 116 | return -1; |
| 117 | if (is_8bit) |
| 118 | len = decode_run_8bit(&gb, &color); |
| 119 | else |
| 120 | len = decode_run_2bit(&gb, &color); |
| 121 | len = FFMIN(len, w - x); |
| 122 | memset(d + x, color, len); |
| 123 | x += len; |
| 124 | if (x >= w) { |
| 125 | y++; |
| 126 | if (y >= h) |
| 127 | break; |
| 128 | d += linesize; |
| 129 | x = 0; |
| 130 | /* byte align */ |
| 131 | align_get_bits(&gb); |
| 132 | } |
| 133 | } |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | static void guess_palette(DVDSubContext* ctx, |
| 138 | uint32_t *rgba_palette, |
| 139 | uint32_t subtitle_color) |
| 140 | { |
| 141 | static const uint8_t level_map[4][4] = { |
| 142 | // this configuration (full range, lowest to highest) in tests |
| 143 | // seemed most common, so assume this |
| 144 | {0xff}, |
| 145 | {0x00, 0xff}, |
| 146 | {0x00, 0x80, 0xff}, |
| 147 | {0x00, 0x55, 0xaa, 0xff}, |
| 148 | }; |
| 149 | uint8_t color_used[16] = { 0 }; |
| 150 | int nb_opaque_colors, i, level, j, r, g, b; |
| 151 | uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha; |
| 152 | |
| 153 | if(ctx->has_palette) { |
| 154 | for(i = 0; i < 4; i++) |
| 155 | rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff) |
| 156 | | ((alpha[i] * 17U) << 24); |
| 157 | return; |
| 158 | } |
| 159 | |
| 160 | for(i = 0; i < 4; i++) |
| 161 | rgba_palette[i] = 0; |
| 162 | |
| 163 | nb_opaque_colors = 0; |
| 164 | for(i = 0; i < 4; i++) { |
| 165 | if (alpha[i] != 0 && !color_used[colormap[i]]) { |
| 166 | color_used[colormap[i]] = 1; |
| 167 | nb_opaque_colors++; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | if (nb_opaque_colors == 0) |
| 172 | return; |
| 173 | |
| 174 | j = 0; |
| 175 | memset(color_used, 0, 16); |
| 176 | for(i = 0; i < 4; i++) { |
| 177 | if (alpha[i] != 0) { |
| 178 | if (!color_used[colormap[i]]) { |
| 179 | level = level_map[nb_opaque_colors][j]; |
| 180 | r = (((subtitle_color >> 16) & 0xff) * level) >> 8; |
| 181 | g = (((subtitle_color >> 8) & 0xff) * level) >> 8; |
| 182 | b = (((subtitle_color >> 0) & 0xff) * level) >> 8; |
| 183 | rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17) << 24); |
| 184 | color_used[colormap[i]] = (i + 1); |
| 185 | j++; |
| 186 | } else { |
| 187 | rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) | |
| 188 | ((alpha[i] * 17) << 24); |
| 189 | } |
| 190 | } |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | static void reset_rects(AVSubtitle *sub_header) |
| 195 | { |
| 196 | int i; |
| 197 | |
| 198 | if (sub_header->rects) { |
| 199 | for (i = 0; i < sub_header->num_rects; i++) { |
| 200 | av_freep(&sub_header->rects[i]->pict.data[0]); |
| 201 | av_freep(&sub_header->rects[i]->pict.data[1]); |
| 202 | av_freep(&sub_header->rects[i]); |
| 203 | } |
| 204 | av_freep(&sub_header->rects); |
| 205 | sub_header->num_rects = 0; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a)) |
| 210 | |
| 211 | static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, |
| 212 | const uint8_t *buf, int buf_size) |
| 213 | { |
| 214 | int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos; |
| 215 | int big_offsets, offset_size, is_8bit = 0; |
| 216 | const uint8_t *yuv_palette = NULL; |
| 217 | uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha; |
| 218 | int date; |
| 219 | int i; |
| 220 | int is_menu = 0; |
| 221 | |
| 222 | if (buf_size < 10) |
| 223 | return -1; |
| 224 | |
| 225 | if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */ |
| 226 | big_offsets = 1; |
| 227 | offset_size = 4; |
| 228 | cmd_pos = 6; |
| 229 | } else { |
| 230 | big_offsets = 0; |
| 231 | offset_size = 2; |
| 232 | cmd_pos = 2; |
| 233 | } |
| 234 | |
| 235 | cmd_pos = READ_OFFSET(buf + cmd_pos); |
| 236 | |
| 237 | if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) |
| 238 | return AVERROR(EAGAIN); |
| 239 | |
| 240 | while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) { |
| 241 | date = AV_RB16(buf + cmd_pos); |
| 242 | next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2); |
| 243 | av_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n", |
| 244 | cmd_pos, next_cmd_pos, date); |
| 245 | pos = cmd_pos + 2 + offset_size; |
| 246 | offset1 = -1; |
| 247 | offset2 = -1; |
| 248 | x1 = y1 = x2 = y2 = 0; |
| 249 | while (pos < buf_size) { |
| 250 | cmd = buf[pos++]; |
| 251 | av_dlog(NULL, "cmd=%02x\n", cmd); |
| 252 | switch(cmd) { |
| 253 | case 0x00: |
| 254 | /* menu subpicture */ |
| 255 | is_menu = 1; |
| 256 | break; |
| 257 | case 0x01: |
| 258 | /* set start date */ |
| 259 | sub_header->start_display_time = (date << 10) / 90; |
| 260 | break; |
| 261 | case 0x02: |
| 262 | /* set end date */ |
| 263 | sub_header->end_display_time = (date << 10) / 90; |
| 264 | break; |
| 265 | case 0x03: |
| 266 | /* set colormap */ |
| 267 | if ((buf_size - pos) < 2) |
| 268 | goto fail; |
| 269 | colormap[3] = buf[pos] >> 4; |
| 270 | colormap[2] = buf[pos] & 0x0f; |
| 271 | colormap[1] = buf[pos + 1] >> 4; |
| 272 | colormap[0] = buf[pos + 1] & 0x0f; |
| 273 | pos += 2; |
| 274 | break; |
| 275 | case 0x04: |
| 276 | /* set alpha */ |
| 277 | if ((buf_size - pos) < 2) |
| 278 | goto fail; |
| 279 | alpha[3] = buf[pos] >> 4; |
| 280 | alpha[2] = buf[pos] & 0x0f; |
| 281 | alpha[1] = buf[pos + 1] >> 4; |
| 282 | alpha[0] = buf[pos + 1] & 0x0f; |
| 283 | pos += 2; |
| 284 | av_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]); |
| 285 | break; |
| 286 | case 0x05: |
| 287 | case 0x85: |
| 288 | if ((buf_size - pos) < 6) |
| 289 | goto fail; |
| 290 | x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4); |
| 291 | x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2]; |
| 292 | y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4); |
| 293 | y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5]; |
| 294 | if (cmd & 0x80) |
| 295 | is_8bit = 1; |
| 296 | av_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2); |
| 297 | pos += 6; |
| 298 | break; |
| 299 | case 0x06: |
| 300 | if ((buf_size - pos) < 4) |
| 301 | goto fail; |
| 302 | offset1 = AV_RB16(buf + pos); |
| 303 | offset2 = AV_RB16(buf + pos + 2); |
| 304 | av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2); |
| 305 | pos += 4; |
| 306 | break; |
| 307 | case 0x86: |
| 308 | if ((buf_size - pos) < 8) |
| 309 | goto fail; |
| 310 | offset1 = AV_RB32(buf + pos); |
| 311 | offset2 = AV_RB32(buf + pos + 4); |
| 312 | av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2); |
| 313 | pos += 8; |
| 314 | break; |
| 315 | |
| 316 | case 0x83: |
| 317 | /* HD set palette */ |
| 318 | if ((buf_size - pos) < 768) |
| 319 | goto fail; |
| 320 | yuv_palette = buf + pos; |
| 321 | pos += 768; |
| 322 | break; |
| 323 | case 0x84: |
| 324 | /* HD set contrast (alpha) */ |
| 325 | if ((buf_size - pos) < 256) |
| 326 | goto fail; |
| 327 | for (i = 0; i < 256; i++) |
| 328 | alpha[i] = 0xFF - buf[pos+i]; |
| 329 | pos += 256; |
| 330 | break; |
| 331 | |
| 332 | case 0xff: |
| 333 | goto the_end; |
| 334 | default: |
| 335 | av_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd); |
| 336 | goto the_end; |
| 337 | } |
| 338 | } |
| 339 | the_end: |
| 340 | if (offset1 >= 0) { |
| 341 | int w, h; |
| 342 | uint8_t *bitmap; |
| 343 | |
| 344 | /* decode the bitmap */ |
| 345 | w = x2 - x1 + 1; |
| 346 | if (w < 0) |
| 347 | w = 0; |
| 348 | h = y2 - y1 + 1; |
| 349 | if (h < 0) |
| 350 | h = 0; |
| 351 | if (w > 0 && h > 0) { |
| 352 | reset_rects(sub_header); |
| 353 | |
| 354 | bitmap = av_malloc(w * h); |
| 355 | sub_header->rects = av_mallocz(sizeof(*sub_header->rects)); |
| 356 | sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect)); |
| 357 | sub_header->num_rects = 1; |
| 358 | sub_header->rects[0]->pict.data[0] = bitmap; |
| 359 | decode_rle(bitmap, w * 2, w, (h + 1) / 2, |
| 360 | buf, offset1, buf_size, is_8bit); |
| 361 | decode_rle(bitmap + w, w * 2, w, h / 2, |
| 362 | buf, offset2, buf_size, is_8bit); |
| 363 | sub_header->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE); |
| 364 | if (is_8bit) { |
| 365 | if (!yuv_palette) |
| 366 | goto fail; |
| 367 | sub_header->rects[0]->nb_colors = 256; |
| 368 | yuv_a_to_rgba(yuv_palette, alpha, (uint32_t*)sub_header->rects[0]->pict.data[1], 256); |
| 369 | } else { |
| 370 | sub_header->rects[0]->nb_colors = 4; |
| 371 | guess_palette(ctx, (uint32_t*)sub_header->rects[0]->pict.data[1], |
| 372 | 0xffff00); |
| 373 | } |
| 374 | sub_header->rects[0]->x = x1; |
| 375 | sub_header->rects[0]->y = y1; |
| 376 | sub_header->rects[0]->w = w; |
| 377 | sub_header->rects[0]->h = h; |
| 378 | sub_header->rects[0]->type = SUBTITLE_BITMAP; |
| 379 | sub_header->rects[0]->pict.linesize[0] = w; |
| 380 | sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0; |
| 381 | } |
| 382 | } |
| 383 | if (next_cmd_pos < cmd_pos) { |
| 384 | av_log(NULL, AV_LOG_ERROR, "Invalid command offset\n"); |
| 385 | break; |
| 386 | } |
| 387 | if (next_cmd_pos == cmd_pos) |
| 388 | break; |
| 389 | cmd_pos = next_cmd_pos; |
| 390 | } |
| 391 | if (sub_header->num_rects > 0) |
| 392 | return is_menu; |
| 393 | fail: |
| 394 | reset_rects(sub_header); |
| 395 | return -1; |
| 396 | } |
| 397 | |
| 398 | static int is_transp(const uint8_t *buf, int pitch, int n, |
| 399 | const uint8_t *transp_color) |
| 400 | { |
| 401 | int i; |
| 402 | for(i = 0; i < n; i++) { |
| 403 | if (!transp_color[*buf]) |
| 404 | return 0; |
| 405 | buf += pitch; |
| 406 | } |
| 407 | return 1; |
| 408 | } |
| 409 | |
| 410 | /* return 0 if empty rectangle, 1 if non empty */ |
| 411 | static int find_smallest_bounding_rectangle(AVSubtitle *s) |
| 412 | { |
| 413 | uint8_t transp_color[256] = { 0 }; |
| 414 | int y1, y2, x1, x2, y, w, h, i; |
| 415 | uint8_t *bitmap; |
| 416 | |
| 417 | if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0) |
| 418 | return 0; |
| 419 | |
| 420 | for(i = 0; i < s->rects[0]->nb_colors; i++) { |
| 421 | if ((((uint32_t*)s->rects[0]->pict.data[1])[i] >> 24) == 0) |
| 422 | transp_color[i] = 1; |
| 423 | } |
| 424 | y1 = 0; |
| 425 | while (y1 < s->rects[0]->h && is_transp(s->rects[0]->pict.data[0] + y1 * s->rects[0]->pict.linesize[0], |
| 426 | 1, s->rects[0]->w, transp_color)) |
| 427 | y1++; |
| 428 | if (y1 == s->rects[0]->h) { |
| 429 | av_freep(&s->rects[0]->pict.data[0]); |
| 430 | s->rects[0]->w = s->rects[0]->h = 0; |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | y2 = s->rects[0]->h - 1; |
| 435 | while (y2 > 0 && is_transp(s->rects[0]->pict.data[0] + y2 * s->rects[0]->pict.linesize[0], 1, |
| 436 | s->rects[0]->w, transp_color)) |
| 437 | y2--; |
| 438 | x1 = 0; |
| 439 | while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->pict.data[0] + x1, s->rects[0]->pict.linesize[0], |
| 440 | s->rects[0]->h, transp_color)) |
| 441 | x1++; |
| 442 | x2 = s->rects[0]->w - 1; |
| 443 | while (x2 > 0 && is_transp(s->rects[0]->pict.data[0] + x2, s->rects[0]->pict.linesize[0], s->rects[0]->h, |
| 444 | transp_color)) |
| 445 | x2--; |
| 446 | w = x2 - x1 + 1; |
| 447 | h = y2 - y1 + 1; |
| 448 | bitmap = av_malloc(w * h); |
| 449 | if (!bitmap) |
| 450 | return 1; |
| 451 | for(y = 0; y < h; y++) { |
| 452 | memcpy(bitmap + w * y, s->rects[0]->pict.data[0] + x1 + (y1 + y) * s->rects[0]->pict.linesize[0], w); |
| 453 | } |
| 454 | av_freep(&s->rects[0]->pict.data[0]); |
| 455 | s->rects[0]->pict.data[0] = bitmap; |
| 456 | s->rects[0]->pict.linesize[0] = w; |
| 457 | s->rects[0]->w = w; |
| 458 | s->rects[0]->h = h; |
| 459 | s->rects[0]->x += x1; |
| 460 | s->rects[0]->y += y1; |
| 461 | return 1; |
| 462 | } |
| 463 | |
| 464 | #ifdef DEBUG |
| 465 | #define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255) |
| 466 | static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h, |
| 467 | uint32_t *rgba_palette) |
| 468 | { |
| 469 | int x, y, alpha; |
| 470 | uint32_t v; |
| 471 | int back[3] = {0, 255, 0}; /* green background */ |
| 472 | FILE *f; |
| 473 | |
| 474 | f = fopen(filename, "w"); |
| 475 | if (!f) { |
| 476 | perror(filename); |
| 477 | return; |
| 478 | } |
| 479 | fprintf(f, "P6\n" |
| 480 | "%d %d\n" |
| 481 | "%d\n", |
| 482 | w, h, 255); |
| 483 | for(y = 0; y < h; y++) { |
| 484 | for(x = 0; x < w; x++) { |
| 485 | v = rgba_palette[bitmap[y * w + x]]; |
| 486 | alpha = v >> 24; |
| 487 | putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f); |
| 488 | putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f); |
| 489 | putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f); |
| 490 | } |
| 491 | } |
| 492 | fclose(f); |
| 493 | } |
| 494 | #endif |
| 495 | |
| 496 | static int append_to_cached_buf(AVCodecContext *avctx, |
| 497 | const uint8_t *buf, int buf_size) |
| 498 | { |
| 499 | DVDSubContext *ctx = avctx->priv_data; |
| 500 | |
| 501 | if (ctx->buf_size > 0xffff - buf_size) { |
| 502 | av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct " |
| 503 | "too large SPU packets aborted.\n"); |
| 504 | av_freep(&ctx->buf); |
| 505 | return AVERROR_INVALIDDATA; |
| 506 | } |
| 507 | ctx->buf = av_realloc(ctx->buf, ctx->buf_size + buf_size); |
| 508 | if (!ctx->buf) |
| 509 | return AVERROR(ENOMEM); |
| 510 | memcpy(ctx->buf + ctx->buf_size, buf, buf_size); |
| 511 | ctx->buf_size += buf_size; |
| 512 | return 0; |
| 513 | } |
| 514 | |
| 515 | static int dvdsub_decode(AVCodecContext *avctx, |
| 516 | void *data, int *data_size, |
| 517 | AVPacket *avpkt) |
| 518 | { |
| 519 | DVDSubContext *ctx = avctx->priv_data; |
| 520 | const uint8_t *buf = avpkt->data; |
| 521 | int buf_size = avpkt->size; |
| 522 | AVSubtitle *sub = data; |
| 523 | int is_menu; |
| 524 | |
| 525 | if (ctx->buf) { |
| 526 | int ret = append_to_cached_buf(avctx, buf, buf_size); |
| 527 | if (ret < 0) { |
| 528 | *data_size = 0; |
| 529 | return ret; |
| 530 | } |
| 531 | buf = ctx->buf; |
| 532 | buf_size = ctx->buf_size; |
| 533 | } |
| 534 | |
| 535 | is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size); |
| 536 | if (is_menu == AVERROR(EAGAIN)) { |
| 537 | *data_size = 0; |
| 538 | return append_to_cached_buf(avctx, buf, buf_size); |
| 539 | } |
| 540 | |
| 541 | if (is_menu < 0) { |
| 542 | no_subtitle: |
| 543 | reset_rects(sub); |
| 544 | *data_size = 0; |
| 545 | |
| 546 | return buf_size; |
| 547 | } |
| 548 | if (!is_menu && find_smallest_bounding_rectangle(sub) == 0) |
| 549 | goto no_subtitle; |
| 550 | |
| 551 | #if defined(DEBUG) |
| 552 | { |
| 553 | char ppm_name[32]; |
| 554 | |
| 555 | snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++); |
| 556 | av_dlog(NULL, "start=%d ms end =%d ms\n", |
| 557 | sub->start_display_time, |
| 558 | sub->end_display_time); |
| 559 | ppm_save(ppm_name, sub->rects[0]->pict.data[0], |
| 560 | sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->pict.data[1]); |
| 561 | } |
| 562 | #endif |
| 563 | |
| 564 | av_freep(&ctx->buf); |
| 565 | ctx->buf_size = 0; |
| 566 | *data_size = 1; |
| 567 | return buf_size; |
| 568 | } |
| 569 | |
| 570 | static void parse_palette(DVDSubContext *ctx, char *p) |
| 571 | { |
| 572 | int i; |
| 573 | |
| 574 | ctx->has_palette = 1; |
| 575 | for(i=0;i<16;i++) { |
| 576 | ctx->palette[i] = strtoul(p, &p, 16); |
| 577 | while(*p == ',' || av_isspace(*p)) |
| 578 | p++; |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | static int dvdsub_parse_extradata(AVCodecContext *avctx) |
| 583 | { |
| 584 | DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data; |
| 585 | char *dataorig, *data; |
| 586 | |
| 587 | if (!avctx->extradata || !avctx->extradata_size) |
| 588 | return 1; |
| 589 | |
| 590 | dataorig = data = av_malloc(avctx->extradata_size+1); |
| 591 | if (!data) |
| 592 | return AVERROR(ENOMEM); |
| 593 | memcpy(data, avctx->extradata, avctx->extradata_size); |
| 594 | data[avctx->extradata_size] = '\0'; |
| 595 | |
| 596 | for(;;) { |
| 597 | int pos = strcspn(data, "\n\r"); |
| 598 | if (pos==0 && *data==0) |
| 599 | break; |
| 600 | |
| 601 | if (strncmp("palette:", data, 8) == 0) { |
| 602 | parse_palette(ctx, data + 8); |
| 603 | } else if (strncmp("size:", data, 5) == 0) { |
| 604 | int w, h; |
| 605 | if (sscanf(data + 5, "%dx%d", &w, &h) == 2) { |
| 606 | int ret = ff_set_dimensions(avctx, w, h); |
| 607 | if (ret < 0) { |
| 608 | av_free(dataorig); |
| 609 | return ret; |
| 610 | } |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | data += pos; |
| 615 | data += strspn(data, "\n\r"); |
| 616 | } |
| 617 | |
| 618 | av_free(dataorig); |
| 619 | return 1; |
| 620 | } |
| 621 | |
| 622 | static av_cold int dvdsub_init(AVCodecContext *avctx) |
| 623 | { |
| 624 | DVDSubContext *ctx = avctx->priv_data; |
| 625 | int ret; |
| 626 | |
| 627 | if ((ret = dvdsub_parse_extradata(avctx)) < 0) |
| 628 | return ret; |
| 629 | |
| 630 | if (ctx->palette_str) |
| 631 | parse_palette(ctx, ctx->palette_str); |
| 632 | if (ctx->has_palette) { |
| 633 | int i; |
| 634 | av_log(avctx, AV_LOG_DEBUG, "palette:"); |
| 635 | for(i=0;i<16;i++) |
| 636 | av_log(avctx, AV_LOG_DEBUG, " 0x%06x", ctx->palette[i]); |
| 637 | av_log(avctx, AV_LOG_DEBUG, "\n"); |
| 638 | } |
| 639 | |
| 640 | return 1; |
| 641 | } |
| 642 | |
| 643 | static av_cold int dvdsub_close(AVCodecContext *avctx) |
| 644 | { |
| 645 | DVDSubContext *ctx = avctx->priv_data; |
| 646 | av_freep(&ctx->buf); |
| 647 | ctx->buf_size = 0; |
| 648 | return 0; |
| 649 | } |
| 650 | |
| 651 | #define OFFSET(field) offsetof(DVDSubContext, field) |
| 652 | #define VD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM |
| 653 | static const AVOption options[] = { |
| 654 | { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, VD }, |
| 655 | { NULL } |
| 656 | }; |
| 657 | static const AVClass dvdsub_class = { |
| 658 | .class_name = "dvdsubdec", |
| 659 | .item_name = av_default_item_name, |
| 660 | .option = options, |
| 661 | .version = LIBAVUTIL_VERSION_INT, |
| 662 | }; |
| 663 | |
| 664 | AVCodec ff_dvdsub_decoder = { |
| 665 | .name = "dvdsub", |
| 666 | .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"), |
| 667 | .type = AVMEDIA_TYPE_SUBTITLE, |
| 668 | .id = AV_CODEC_ID_DVD_SUBTITLE, |
| 669 | .priv_data_size = sizeof(DVDSubContext), |
| 670 | .init = dvdsub_init, |
| 671 | .decode = dvdsub_decode, |
| 672 | .close = dvdsub_close, |
| 673 | .priv_class = &dvdsub_class, |
| 674 | }; |