| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "codec_internal.h" | ||
| 24 | #include "decode.h" | ||
| 25 | #include "dvdsub.h" | ||
| 26 | #include "get_bits.h" | ||
| 27 | |||
| 28 | #include "libavutil/attributes.h" | ||
| 29 | #include "libavutil/colorspace.h" | ||
| 30 | #include "libavutil/file_open.h" | ||
| 31 | #include "libavutil/mem.h" | ||
| 32 | #include "libavutil/opt.h" | ||
| 33 | #include "libavutil/bswap.h" | ||
| 34 | |||
| 35 | typedef struct DVDSubContext | ||
| 36 | { | ||
| 37 | AVClass *class; | ||
| 38 | uint32_t palette[16]; | ||
| 39 | char *palette_str; | ||
| 40 | char *ifo_str; | ||
| 41 | int has_palette; | ||
| 42 | uint8_t colormap[4]; | ||
| 43 | uint8_t alpha[256]; | ||
| 44 | uint8_t buf[0x10000]; | ||
| 45 | int buf_size; | ||
| 46 | int forced_subs_only; | ||
| 47 | uint8_t used_color[256]; | ||
| 48 | } DVDSubContext; | ||
| 49 | |||
| 50 | ✗ | static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values) | |
| 51 | { | ||
| 52 | ✗ | const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP; | |
| 53 | uint8_t r, g, b; | ||
| 54 | int i, y, cb, cr; | ||
| 55 | int r_add, g_add, b_add; | ||
| 56 | |||
| 57 | ✗ | for (i = num_values; i > 0; i--) { | |
| 58 | ✗ | y = *ycbcr++; | |
| 59 | ✗ | cr = *ycbcr++; | |
| 60 | ✗ | cb = *ycbcr++; | |
| 61 | ✗ | YUV_TO_RGB1_CCIR(cb, cr); | |
| 62 | ✗ | YUV_TO_RGB2_CCIR(r, g, b, y); | |
| 63 | ✗ | *rgba++ = ((unsigned)*alpha++ << 24) | (r << 16) | (g << 8) | b; | |
| 64 | } | ||
| 65 | ✗ | } | |
| 66 | |||
| 67 | 296727 | static int decode_run_2bit(GetBitContext *gb, int *color) | |
| 68 | { | ||
| 69 | unsigned int v, t; | ||
| 70 | |||
| 71 | 296727 | v = 0; | |
| 72 |
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791461 | for (t = 1; v < t && t <= 0x40; t <<= 2) |
| 73 | 494734 | v = (v << 4) | get_bits(gb, 4); | |
| 74 | 296727 | *color = v & 3; | |
| 75 |
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296727 | if (v < 4) { /* Code for fill rest of line */ |
| 76 | 41582 | return INT_MAX; | |
| 77 | } | ||
| 78 | 255145 | return v >> 2; | |
| 79 | } | ||
| 80 | |||
| 81 | ✗ | static int decode_run_8bit(GetBitContext *gb, int *color) | |
| 82 | { | ||
| 83 | int len; | ||
| 84 | ✗ | int has_run = get_bits1(gb); | |
| 85 | ✗ | *color = get_bits(gb, 2 + 6*get_bits1(gb)); | |
| 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 | 174 | static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, uint8_t used_color[256], | |
| 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 |
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174 | if (start >= buf_size) |
| 109 | ✗ | return -1; | |
| 110 | |||
| 111 |
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174 | if (w <= 0 || h <= 0) |
| 112 | ✗ | return -1; | |
| 113 | |||
| 114 | 174 | bit_len = (buf_size - start) * 8; | |
| 115 | 174 | init_get_bits(&gb, buf + start, bit_len); | |
| 116 | |||
| 117 | 174 | x = 0; | |
| 118 | 174 | y = 0; | |
| 119 | 174 | d = bitmap; | |
| 120 | for(;;) { | ||
| 121 |
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296727 | if (get_bits_count(&gb) > bit_len) |
| 122 | ✗ | return -1; | |
| 123 |
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296727 | if (is_8bit) |
| 124 | ✗ | len = decode_run_8bit(&gb, &color); | |
| 125 | else | ||
| 126 | 296727 | len = decode_run_2bit(&gb, &color); | |
| 127 |
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296727 | if (len != INT_MAX && len > w - x) |
| 128 | ✗ | return AVERROR_INVALIDDATA; | |
| 129 | 296727 | len = FFMIN(len, w - x); | |
| 130 | 296727 | memset(d + x, color, len); | |
| 131 | 296727 | used_color[color] = 1; | |
| 132 | 296727 | x += len; | |
| 133 |
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296727 | if (x >= w) { |
| 134 | 41582 | y++; | |
| 135 |
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41582 | if (y >= h) |
| 136 | 174 | break; | |
| 137 | 41408 | d += linesize; | |
| 138 | 41408 | x = 0; | |
| 139 | /* byte align */ | ||
| 140 | 41408 | align_get_bits(&gb); | |
| 141 | } | ||
| 142 | } | ||
| 143 | 174 | return 0; | |
| 144 | } | ||
| 145 | |||
| 146 | 87 | static void guess_palette(DVDSubContext* ctx, | |
| 147 | uint32_t *rgba_palette, | ||
| 148 | uint32_t subtitle_color) | ||
| 149 | { | ||
| 150 | static const uint8_t level_map[4][4] = { | ||
| 151 | // this configuration (full range, lowest to highest) in tests | ||
| 152 | // seemed most common, so assume this | ||
| 153 | {0xff}, | ||
| 154 | {0x00, 0xff}, | ||
| 155 | {0x00, 0x80, 0xff}, | ||
| 156 | {0x00, 0x55, 0xaa, 0xff}, | ||
| 157 | }; | ||
| 158 | 87 | uint8_t color_used[16] = { 0 }; | |
| 159 | int nb_opaque_colors, i, level, j, r, g, b; | ||
| 160 | 87 | uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha; | |
| 161 | |||
| 162 |
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87 | if(ctx->has_palette) { |
| 163 |
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435 | for(i = 0; i < 4; i++) |
| 164 | 348 | rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff) | |
| 165 | 348 | | ((alpha[i] * 17U) << 24); | |
| 166 | 87 | return; | |
| 167 | } | ||
| 168 | |||
| 169 | ✗ | for(i = 0; i < 4; i++) | |
| 170 | ✗ | rgba_palette[i] = 0; | |
| 171 | |||
| 172 | ✗ | nb_opaque_colors = 0; | |
| 173 | ✗ | for(i = 0; i < 4; i++) { | |
| 174 | ✗ | if (alpha[i] != 0 && !color_used[colormap[i]]) { | |
| 175 | ✗ | color_used[colormap[i]] = 1; | |
| 176 | ✗ | nb_opaque_colors++; | |
| 177 | } | ||
| 178 | } | ||
| 179 | |||
| 180 | ✗ | if (nb_opaque_colors == 0) | |
| 181 | ✗ | return; | |
| 182 | |||
| 183 | ✗ | j = 0; | |
| 184 | ✗ | memset(color_used, 0, 16); | |
| 185 | ✗ | for(i = 0; i < 4; i++) { | |
| 186 | ✗ | if (alpha[i] != 0) { | |
| 187 | ✗ | if (!color_used[colormap[i]]) { | |
| 188 | ✗ | level = level_map[nb_opaque_colors - 1][j]; | |
| 189 | ✗ | r = (((subtitle_color >> 16) & 0xff) * level) >> 8; | |
| 190 | ✗ | g = (((subtitle_color >> 8) & 0xff) * level) >> 8; | |
| 191 | ✗ | b = (((subtitle_color >> 0) & 0xff) * level) >> 8; | |
| 192 | ✗ | rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17U) << 24); | |
| 193 | ✗ | color_used[colormap[i]] = (i + 1); | |
| 194 | ✗ | j++; | |
| 195 | } else { | ||
| 196 | ✗ | rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) | | |
| 197 | ✗ | ((alpha[i] * 17U) << 24); | |
| 198 | } | ||
| 199 | } | ||
| 200 | } | ||
| 201 | } | ||
| 202 | |||
| 203 | 87 | static void reset_rects(AVSubtitle *sub_header) | |
| 204 | { | ||
| 205 | int i; | ||
| 206 | |||
| 207 |
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87 | if (sub_header->rects) { |
| 208 | ✗ | for (i = 0; i < sub_header->num_rects; i++) { | |
| 209 | ✗ | av_freep(&sub_header->rects[i]->data[0]); | |
| 210 | ✗ | av_freep(&sub_header->rects[i]->data[1]); | |
| 211 | ✗ | av_freep(&sub_header->rects[i]); | |
| 212 | } | ||
| 213 | ✗ | av_freep(&sub_header->rects); | |
| 214 | ✗ | sub_header->num_rects = 0; | |
| 215 | } | ||
| 216 | 87 | } | |
| 217 | |||
| 218 | #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a)) | ||
| 219 | |||
| 220 | 93 | static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, | |
| 221 | const uint8_t *buf, int buf_size) | ||
| 222 | { | ||
| 223 | int cmd_pos, pos, cmd, x1, y1, x2, y2, next_cmd_pos; | ||
| 224 | 93 | int big_offsets, offset_size, is_8bit = 0; | |
| 225 | 93 | const uint8_t *yuv_palette = NULL; | |
| 226 | 93 | uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha; | |
| 227 | int date; | ||
| 228 | int i; | ||
| 229 | 93 | int is_menu = 0; | |
| 230 | uint32_t size; | ||
| 231 | int64_t offset1, offset2; | ||
| 232 | |||
| 233 |
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93 | if (buf_size < 10) |
| 234 | ✗ | return -1; | |
| 235 | |||
| 236 |
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93 | if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */ |
| 237 | ✗ | big_offsets = 1; | |
| 238 | ✗ | offset_size = 4; | |
| 239 | ✗ | cmd_pos = 6; | |
| 240 | } else { | ||
| 241 | 93 | big_offsets = 0; | |
| 242 | 93 | offset_size = 2; | |
| 243 | 93 | cmd_pos = 2; | |
| 244 | } | ||
| 245 | |||
| 246 |
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93 | size = READ_OFFSET(buf + (big_offsets ? 2 : 0)); |
| 247 |
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93 | cmd_pos = READ_OFFSET(buf + cmd_pos); |
| 248 | |||
| 249 |
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93 | if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) { |
| 250 |
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6 | if (cmd_pos > size) { |
| 251 | ✗ | av_log(ctx, AV_LOG_ERROR, "Discarding invalid packet\n"); | |
| 252 | ✗ | return 0; | |
| 253 | } | ||
| 254 | 6 | return AVERROR(EAGAIN); | |
| 255 | } | ||
| 256 | |||
| 257 |
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173 | while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) { |
| 258 | 173 | date = AV_RB16(buf + cmd_pos); | |
| 259 |
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173 | next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2); |
| 260 | ff_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n", | ||
| 261 | cmd_pos, next_cmd_pos, date); | ||
| 262 | 173 | pos = cmd_pos + 2 + offset_size; | |
| 263 | 173 | offset1 = -1; | |
| 264 | 173 | offset2 = -1; | |
| 265 | 173 | x1 = y1 = x2 = y2 = 0; | |
| 266 |
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694 | while (pos < buf_size) { |
| 267 | 694 | cmd = buf[pos++]; | |
| 268 | ff_dlog(NULL, "cmd=%02x\n", cmd); | ||
| 269 |
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694 | switch(cmd) { |
| 270 | ✗ | case 0x00: | |
| 271 | /* menu subpicture */ | ||
| 272 | ✗ | is_menu = 1; | |
| 273 | ✗ | break; | |
| 274 | 87 | case 0x01: | |
| 275 | /* set start date */ | ||
| 276 | 87 | sub_header->start_display_time = (date << 10) / 90; | |
| 277 | 87 | break; | |
| 278 | 86 | case 0x02: | |
| 279 | /* set end date */ | ||
| 280 | 86 | sub_header->end_display_time = (date << 10) / 90; | |
| 281 | 86 | break; | |
| 282 | 87 | case 0x03: | |
| 283 | /* set colormap */ | ||
| 284 |
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87 | if ((buf_size - pos) < 2) |
| 285 | ✗ | goto fail; | |
| 286 | 87 | colormap[3] = buf[pos] >> 4; | |
| 287 | 87 | colormap[2] = buf[pos] & 0x0f; | |
| 288 | 87 | colormap[1] = buf[pos + 1] >> 4; | |
| 289 | 87 | colormap[0] = buf[pos + 1] & 0x0f; | |
| 290 | 87 | pos += 2; | |
| 291 | 87 | break; | |
| 292 | 87 | case 0x04: | |
| 293 | /* set alpha */ | ||
| 294 |
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87 | if ((buf_size - pos) < 2) |
| 295 | ✗ | goto fail; | |
| 296 | 87 | alpha[3] = buf[pos] >> 4; | |
| 297 | 87 | alpha[2] = buf[pos] & 0x0f; | |
| 298 | 87 | alpha[1] = buf[pos + 1] >> 4; | |
| 299 | 87 | alpha[0] = buf[pos + 1] & 0x0f; | |
| 300 | 87 | pos += 2; | |
| 301 | ff_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]); | ||
| 302 | 87 | break; | |
| 303 | 87 | case 0x05: | |
| 304 | case 0x85: | ||
| 305 |
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87 | if ((buf_size - pos) < 6) |
| 306 | ✗ | goto fail; | |
| 307 | 87 | x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4); | |
| 308 | 87 | x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2]; | |
| 309 | 87 | y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4); | |
| 310 | 87 | y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5]; | |
| 311 |
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87 | if (cmd & 0x80) |
| 312 | ✗ | is_8bit = 1; | |
| 313 | ff_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2); | ||
| 314 | 87 | pos += 6; | |
| 315 | 87 | break; | |
| 316 | 87 | case 0x06: | |
| 317 |
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87 | if ((buf_size - pos) < 4) |
| 318 | ✗ | goto fail; | |
| 319 | 87 | offset1 = AV_RB16(buf + pos); | |
| 320 | 87 | offset2 = AV_RB16(buf + pos + 2); | |
| 321 | ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2); | ||
| 322 | 87 | pos += 4; | |
| 323 | 87 | break; | |
| 324 | ✗ | case 0x86: | |
| 325 | ✗ | if ((buf_size - pos) < 8) | |
| 326 | ✗ | goto fail; | |
| 327 | ✗ | offset1 = AV_RB32(buf + pos); | |
| 328 | ✗ | offset2 = AV_RB32(buf + pos + 4); | |
| 329 | ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2); | ||
| 330 | ✗ | pos += 8; | |
| 331 | ✗ | break; | |
| 332 | |||
| 333 | ✗ | case 0x83: | |
| 334 | /* HD set palette */ | ||
| 335 | ✗ | if ((buf_size - pos) < 768) | |
| 336 | ✗ | goto fail; | |
| 337 | ✗ | yuv_palette = buf + pos; | |
| 338 | ✗ | pos += 768; | |
| 339 | ✗ | break; | |
| 340 | ✗ | case 0x84: | |
| 341 | /* HD set contrast (alpha) */ | ||
| 342 | ✗ | if ((buf_size - pos) < 256) | |
| 343 | ✗ | goto fail; | |
| 344 | ✗ | for (i = 0; i < 256; i++) | |
| 345 | ✗ | alpha[i] = 0xFF - buf[pos+i]; | |
| 346 | ✗ | pos += 256; | |
| 347 | ✗ | break; | |
| 348 | |||
| 349 | 173 | case 0xff: | |
| 350 | 173 | goto the_end; | |
| 351 | ✗ | default: | |
| 352 | ff_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd); | ||
| 353 | ✗ | goto the_end; | |
| 354 | } | ||
| 355 | } | ||
| 356 | ✗ | the_end: | |
| 357 |
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173 | if (offset1 >= buf_size || offset2 >= buf_size) |
| 358 | ✗ | goto fail; | |
| 359 | |||
| 360 |
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173 | if (offset1 >= 0 && offset2 >= 0) { |
| 361 | int w, h; | ||
| 362 | uint8_t *bitmap; | ||
| 363 | |||
| 364 | /* decode the bitmap */ | ||
| 365 | 87 | w = x2 - x1 + 1; | |
| 366 |
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87 | if (w < 0) |
| 367 | ✗ | w = 0; | |
| 368 | 87 | h = y2 - y1 + 1; | |
| 369 |
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87 | if (h < 0) |
| 370 | ✗ | h = 0; | |
| 371 |
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87 | if (w > 0 && h > 1) { |
| 372 | 87 | reset_rects(sub_header); | |
| 373 | 87 | memset(ctx->used_color, 0, sizeof(ctx->used_color)); | |
| 374 | 87 | sub_header->rects = av_mallocz(sizeof(*sub_header->rects)); | |
| 375 |
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87 | if (!sub_header->rects) |
| 376 | ✗ | goto fail; | |
| 377 | 87 | sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect)); | |
| 378 |
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87 | if (!sub_header->rects[0]) |
| 379 | ✗ | goto fail; | |
| 380 | 87 | sub_header->num_rects = 1; | |
| 381 | 87 | bitmap = sub_header->rects[0]->data[0] = av_malloc(w * h); | |
| 382 |
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87 | if (!bitmap) |
| 383 | ✗ | goto fail; | |
| 384 |
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87 | if (decode_rle(bitmap, w * 2, w, (h + 1) / 2, ctx->used_color, |
| 385 | buf, offset1, buf_size, is_8bit) < 0) | ||
| 386 | ✗ | goto fail; | |
| 387 |
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87 | if (decode_rle(bitmap + w, w * 2, w, h / 2, ctx->used_color, |
| 388 | buf, offset2, buf_size, is_8bit) < 0) | ||
| 389 | ✗ | goto fail; | |
| 390 | 87 | sub_header->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE); | |
| 391 |
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87 | if (!sub_header->rects[0]->data[1]) |
| 392 | ✗ | goto fail; | |
| 393 |
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87 | if (is_8bit) { |
| 394 | ✗ | if (!yuv_palette) | |
| 395 | ✗ | goto fail; | |
| 396 | ✗ | sub_header->rects[0]->nb_colors = 256; | |
| 397 | ✗ | yuv_a_to_rgba(yuv_palette, alpha, | |
| 398 | ✗ | (uint32_t *)sub_header->rects[0]->data[1], | |
| 399 | 256); | ||
| 400 | } else { | ||
| 401 | 87 | sub_header->rects[0]->nb_colors = 4; | |
| 402 | 87 | guess_palette(ctx, (uint32_t*)sub_header->rects[0]->data[1], | |
| 403 | 0xffffff); | ||
| 404 | } | ||
| 405 | 87 | sub_header->rects[0]->x = x1; | |
| 406 | 87 | sub_header->rects[0]->y = y1; | |
| 407 | 87 | sub_header->rects[0]->w = w; | |
| 408 | 87 | sub_header->rects[0]->h = h; | |
| 409 | 87 | sub_header->rects[0]->type = SUBTITLE_BITMAP; | |
| 410 | 87 | sub_header->rects[0]->linesize[0] = w; | |
| 411 | 87 | sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0; | |
| 412 | } | ||
| 413 | } | ||
| 414 |
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173 | if (next_cmd_pos < cmd_pos) { |
| 415 | ✗ | av_log(ctx, AV_LOG_ERROR, "Invalid command offset\n"); | |
| 416 | ✗ | break; | |
| 417 | } | ||
| 418 |
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173 | if (next_cmd_pos == cmd_pos) |
| 419 | 87 | break; | |
| 420 | 86 | cmd_pos = next_cmd_pos; | |
| 421 | } | ||
| 422 |
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87 | if (sub_header->num_rects > 0) |
| 423 | 87 | return is_menu; | |
| 424 | ✗ | fail: | |
| 425 | ✗ | reset_rects(sub_header); | |
| 426 | ✗ | return -1; | |
| 427 | } | ||
| 428 | |||
| 429 | 76353 | static int is_transp(const uint8_t *buf, int pitch, int n, | |
| 430 | const uint8_t *transp_color) | ||
| 431 | { | ||
| 432 | int i; | ||
| 433 |
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45815197 | for(i = 0; i < n; i++) { |
| 434 |
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45739192 | if (!transp_color[*buf]) |
| 435 | 348 | return 0; | |
| 436 | 45738844 | buf += pitch; | |
| 437 | } | ||
| 438 | 76005 | return 1; | |
| 439 | } | ||
| 440 | |||
| 441 | /* return 0 if empty rectangle, 1 if non empty */ | ||
| 442 | 87 | static int find_smallest_bounding_rectangle(DVDSubContext *ctx, AVSubtitle *s) | |
| 443 | { | ||
| 444 | 87 | uint8_t transp_color[256] = { 0 }; | |
| 445 | int y1, y2, x1, x2, y, w, h, i; | ||
| 446 | uint8_t *bitmap; | ||
| 447 | 87 | int transparent = 1; | |
| 448 | |||
| 449 |
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|
87 | if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0) |
| 450 | ✗ | return 0; | |
| 451 | |||
| 452 |
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435 | for(i = 0; i < s->rects[0]->nb_colors; i++) { |
| 453 |
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348 | if ((((uint32_t *)s->rects[0]->data[1])[i] >> 24) == 0) { |
| 454 | 174 | transp_color[i] = 1; | |
| 455 |
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174 | } else if (ctx->used_color[i]) |
| 456 | 174 | transparent = 0; | |
| 457 | } | ||
| 458 |
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87 | if (transparent) |
| 459 | ✗ | return 0; | |
| 460 | 87 | y1 = 0; | |
| 461 |
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63326 | while (y1 < s->rects[0]->h && is_transp(s->rects[0]->data[0] + y1 * s->rects[0]->linesize[0], |
| 462 | 31663 | 1, s->rects[0]->w, transp_color)) | |
| 463 | 31576 | y1++; | |
| 464 |
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87 | if (y1 == s->rects[0]->h) { |
| 465 | ✗ | av_freep(&s->rects[0]->data[0]); | |
| 466 | ✗ | s->rects[0]->w = s->rects[0]->h = 0; | |
| 467 | ✗ | return 0; | |
| 468 | } | ||
| 469 | |||
| 470 | 87 | y2 = s->rects[0]->h - 1; | |
| 471 |
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13864 | while (y2 > 0 && is_transp(s->rects[0]->data[0] + y2 * s->rects[0]->linesize[0], 1, |
| 472 | 6932 | s->rects[0]->w, transp_color)) | |
| 473 | 6845 | y2--; | |
| 474 | 87 | x1 = 0; | |
| 475 |
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37626 | while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->data[0] + x1, s->rects[0]->linesize[0], |
| 476 | 18813 | s->rects[0]->h, transp_color)) | |
| 477 | 18726 | x1++; | |
| 478 | 87 | x2 = s->rects[0]->w - 1; | |
| 479 |
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18945 | while (x2 > 0 && is_transp(s->rects[0]->data[0] + x2, s->rects[0]->linesize[0], s->rects[0]->h, |
| 480 | transp_color)) | ||
| 481 | 18858 | x2--; | |
| 482 | 87 | w = x2 - x1 + 1; | |
| 483 | 87 | h = y2 - y1 + 1; | |
| 484 | 87 | bitmap = av_malloc(w * h); | |
| 485 |
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87 | if (!bitmap) |
| 486 | ✗ | return 1; | |
| 487 |
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3248 | for(y = 0; y < h; y++) { |
| 488 | 3161 | memcpy(bitmap + w * y, s->rects[0]->data[0] + x1 + (y1 + y) * s->rects[0]->linesize[0], w); | |
| 489 | } | ||
| 490 | 87 | av_freep(&s->rects[0]->data[0]); | |
| 491 | 87 | s->rects[0]->data[0] = bitmap; | |
| 492 | 87 | s->rects[0]->linesize[0] = w; | |
| 493 | 87 | s->rects[0]->w = w; | |
| 494 | 87 | s->rects[0]->h = h; | |
| 495 | 87 | s->rects[0]->x += x1; | |
| 496 | 87 | s->rects[0]->y += y1; | |
| 497 | |||
| 498 | 87 | return 1; | |
| 499 | } | ||
| 500 | |||
| 501 | 12 | static int append_to_cached_buf(AVCodecContext *avctx, | |
| 502 | const uint8_t *buf, int buf_size) | ||
| 503 | { | ||
| 504 | 12 | DVDSubContext *ctx = avctx->priv_data; | |
| 505 | |||
| 506 |
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12 | av_assert0(buf_size >= 0 && ctx->buf_size <= sizeof(ctx->buf)); |
| 507 |
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12 | if (buf_size >= sizeof(ctx->buf) - ctx->buf_size) { |
| 508 | ✗ | av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct " | |
| 509 | "too large SPU packets aborted.\n"); | ||
| 510 | ✗ | ctx->buf_size = 0; | |
| 511 | ✗ | return AVERROR_INVALIDDATA; | |
| 512 | } | ||
| 513 | 12 | memcpy(ctx->buf + ctx->buf_size, buf, buf_size); | |
| 514 | 12 | ctx->buf_size += buf_size; | |
| 515 | 12 | return 0; | |
| 516 | } | ||
| 517 | |||
| 518 | 93 | static int dvdsub_decode(AVCodecContext *avctx, AVSubtitle *sub, | |
| 519 | int *data_size, const AVPacket *avpkt) | ||
| 520 | { | ||
| 521 | 93 | DVDSubContext *ctx = avctx->priv_data; | |
| 522 | 93 | const uint8_t *buf = avpkt->data; | |
| 523 | 93 | int buf_size = avpkt->size; | |
| 524 | 93 | int appended = 0; | |
| 525 | int is_menu; | ||
| 526 | |||
| 527 |
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93 | if (ctx->buf_size) { |
| 528 | 6 | int ret = append_to_cached_buf(avctx, buf, buf_size); | |
| 529 |
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6 | if (ret < 0) { |
| 530 | ✗ | *data_size = 0; | |
| 531 | ✗ | return ret; | |
| 532 | } | ||
| 533 | 6 | buf = ctx->buf; | |
| 534 | 6 | buf_size = ctx->buf_size; | |
| 535 | 6 | appended = 1; | |
| 536 | } | ||
| 537 | |||
| 538 | 93 | is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size); | |
| 539 |
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93 | if (is_menu == AVERROR(EAGAIN)) { |
| 540 | 6 | *data_size = 0; | |
| 541 |
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6 | return appended ? 0 : append_to_cached_buf(avctx, buf, buf_size); |
| 542 | } | ||
| 543 | |||
| 544 |
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87 | if (is_menu < 0) { |
| 545 | ✗ | ctx->buf_size = 0; | |
| 546 | ✗ | no_subtitle: | |
| 547 | ✗ | reset_rects(sub); | |
| 548 | ✗ | *data_size = 0; | |
| 549 | |||
| 550 | ✗ | return buf_size; | |
| 551 | } | ||
| 552 |
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87 | if (!is_menu && find_smallest_bounding_rectangle(ctx, sub) == 0) |
| 553 | ✗ | goto no_subtitle; | |
| 554 | |||
| 555 |
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87 | if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED)) |
| 556 | ✗ | goto no_subtitle; | |
| 557 | |||
| 558 | 87 | ctx->buf_size = 0; | |
| 559 | 87 | *data_size = 1; | |
| 560 | 87 | return buf_size; | |
| 561 | } | ||
| 562 | |||
| 563 | ✗ | static int parse_ifo_palette(DVDSubContext *ctx, char *p) | |
| 564 | { | ||
| 565 | FILE *ifo; | ||
| 566 | char ifostr[12]; | ||
| 567 | uint32_t sp_pgci, pgci, off_pgc, pgc; | ||
| 568 | uint8_t r, g, b, yuv[65], *buf; | ||
| 569 | int i, y, cb, cr, r_add, g_add, b_add; | ||
| 570 | ✗ | int ret = 0; | |
| 571 | ✗ | const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP; | |
| 572 | |||
| 573 | ✗ | ctx->has_palette = 0; | |
| 574 | ✗ | if ((ifo = avpriv_fopen_utf8(p, "r")) == NULL) { | |
| 575 | ✗ | av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno))); | |
| 576 | ✗ | return AVERROR_EOF; | |
| 577 | } | ||
| 578 | ✗ | if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) { | |
| 579 | ✗ | av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p); | |
| 580 | ✗ | ret = AVERROR_INVALIDDATA; | |
| 581 | ✗ | goto end; | |
| 582 | } | ||
| 583 | ✗ | if (fseek(ifo, 0xCC, SEEK_SET) == -1) { | |
| 584 | ✗ | ret = AVERROR(errno); | |
| 585 | ✗ | goto end; | |
| 586 | } | ||
| 587 | ✗ | if (fread(&sp_pgci, 4, 1, ifo) == 1) { | |
| 588 | ✗ | pgci = av_be2ne32(sp_pgci) * 2048; | |
| 589 | ✗ | if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) { | |
| 590 | ✗ | ret = AVERROR(errno); | |
| 591 | ✗ | goto end; | |
| 592 | } | ||
| 593 | ✗ | if (fread(&off_pgc, 4, 1, ifo) == 1) { | |
| 594 | ✗ | pgc = pgci + av_be2ne32(off_pgc); | |
| 595 | ✗ | if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) { | |
| 596 | ✗ | ret = AVERROR(errno); | |
| 597 | ✗ | goto end; | |
| 598 | } | ||
| 599 | ✗ | if (fread(yuv, 64, 1, ifo) == 1) { | |
| 600 | ✗ | buf = yuv; | |
| 601 | ✗ | for(i=0; i<16; i++) { | |
| 602 | ✗ | y = *++buf; | |
| 603 | ✗ | cr = *++buf; | |
| 604 | ✗ | cb = *++buf; | |
| 605 | ✗ | YUV_TO_RGB1_CCIR(cb, cr); | |
| 606 | ✗ | YUV_TO_RGB2_CCIR(r, g, b, y); | |
| 607 | ✗ | ctx->palette[i] = (r << 16) + (g << 8) + b; | |
| 608 | ✗ | buf++; | |
| 609 | } | ||
| 610 | ✗ | ctx->has_palette = 1; | |
| 611 | } | ||
| 612 | } | ||
| 613 | } | ||
| 614 | ✗ | if (ctx->has_palette == 0) { | |
| 615 | ✗ | av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p); | |
| 616 | ✗ | ret = AVERROR_INVALIDDATA; | |
| 617 | } | ||
| 618 | ✗ | end: | |
| 619 | ✗ | fclose(ifo); | |
| 620 | ✗ | return ret; | |
| 621 | } | ||
| 622 | |||
| 623 | 13 | static int dvdsub_parse_extradata(AVCodecContext *avctx) | |
| 624 | { | ||
| 625 | 13 | DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data; | |
| 626 | char *dataorig, *data; | ||
| 627 | 13 | int ret = 1; | |
| 628 | |||
| 629 |
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13 | if (!avctx->extradata || !avctx->extradata_size) |
| 630 | 2 | return 1; | |
| 631 | |||
| 632 | 11 | dataorig = data = av_malloc(avctx->extradata_size+1); | |
| 633 |
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11 | if (!data) |
| 634 | ✗ | return AVERROR(ENOMEM); | |
| 635 | 11 | memcpy(data, avctx->extradata, avctx->extradata_size); | |
| 636 | 11 | data[avctx->extradata_size] = '\0'; | |
| 637 | |||
| 638 | 73 | for(;;) { | |
| 639 | 84 | int pos = strcspn(data, "\n\r"); | |
| 640 |
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84 | if (pos==0 && *data==0) |
| 641 | 11 | break; | |
| 642 | |||
| 643 |
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73 | if (strncmp("palette:", data, 8) == 0) { |
| 644 | 11 | ctx->has_palette = 1; | |
| 645 | 11 | ff_dvdsub_parse_palette(ctx->palette, data + 8); | |
| 646 |
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62 | } else if (strncmp("size:", data, 5) == 0) { |
| 647 | int w, h; | ||
| 648 |
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11 | if (sscanf(data + 5, "%dx%d", &w, &h) == 2) { |
| 649 | 11 | ret = ff_set_dimensions(avctx, w, h); | |
| 650 |
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11 | if (ret < 0) |
| 651 | ✗ | goto fail; | |
| 652 | } | ||
| 653 | } | ||
| 654 | |||
| 655 | 73 | data += pos; | |
| 656 | 73 | data += strspn(data, "\n\r"); | |
| 657 | } | ||
| 658 | |||
| 659 | 11 | fail: | |
| 660 | 11 | av_free(dataorig); | |
| 661 | 11 | return ret; | |
| 662 | } | ||
| 663 | |||
| 664 | 13 | static av_cold int dvdsub_init(AVCodecContext *avctx) | |
| 665 | { | ||
| 666 | 13 | DVDSubContext *ctx = avctx->priv_data; | |
| 667 | int ret; | ||
| 668 | |||
| 669 |
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13 | if ((ret = dvdsub_parse_extradata(avctx)) < 0) |
| 670 | ✗ | return ret; | |
| 671 | |||
| 672 |
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13 | if (ctx->ifo_str) |
| 673 | ✗ | parse_ifo_palette(ctx, ctx->ifo_str); | |
| 674 |
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13 | if (ctx->palette_str) { |
| 675 | ✗ | ctx->has_palette = 1; | |
| 676 | ✗ | ff_dvdsub_parse_palette(ctx->palette, ctx->palette_str); | |
| 677 | } | ||
| 678 |
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13 | if (ctx->has_palette) { |
| 679 | int i; | ||
| 680 | 11 | av_log(avctx, AV_LOG_DEBUG, "palette:"); | |
| 681 |
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187 | for(i=0;i<16;i++) |
| 682 | 176 | av_log(avctx, AV_LOG_DEBUG, " 0x%06"PRIx32, ctx->palette[i]); | |
| 683 | 11 | av_log(avctx, AV_LOG_DEBUG, "\n"); | |
| 684 | } | ||
| 685 | |||
| 686 | 13 | return 1; | |
| 687 | } | ||
| 688 | |||
| 689 | ✗ | static void dvdsub_flush(AVCodecContext *avctx) | |
| 690 | { | ||
| 691 | ✗ | DVDSubContext *ctx = avctx->priv_data; | |
| 692 | ✗ | ctx->buf_size = 0; | |
| 693 | ✗ | } | |
| 694 | |||
| 695 | #define OFFSET(field) offsetof(DVDSubContext, field) | ||
| 696 | #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM | ||
| 697 | static const AVOption options[] = { | ||
| 698 | { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD }, | ||
| 699 | { "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD }, | ||
| 700 | { "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD}, | ||
| 701 | { NULL } | ||
| 702 | }; | ||
| 703 | static const AVClass dvdsub_class = { | ||
| 704 | .class_name = "dvdsubdec", | ||
| 705 | .item_name = av_default_item_name, | ||
| 706 | .option = options, | ||
| 707 | .version = LIBAVUTIL_VERSION_INT, | ||
| 708 | }; | ||
| 709 | |||
| 710 | const FFCodec ff_dvdsub_decoder = { | ||
| 711 | .p.name = "dvdsub", | ||
| 712 | CODEC_LONG_NAME("DVD subtitles"), | ||
| 713 | .p.type = AVMEDIA_TYPE_SUBTITLE, | ||
| 714 | .p.id = AV_CODEC_ID_DVD_SUBTITLE, | ||
| 715 | .priv_data_size = sizeof(DVDSubContext), | ||
| 716 | .init = dvdsub_init, | ||
| 717 | FF_CODEC_DECODE_SUB_CB(dvdsub_decode), | ||
| 718 | .flush = dvdsub_flush, | ||
| 719 | .p.priv_class = &dvdsub_class, | ||
| 720 | }; | ||
| 721 |