| 1 | /* |
| 2 | * Copyright (c) 2012 Konstantin Shishkov |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | /** |
| 22 | * @file |
| 23 | * Common functions for Microsoft Screen 1 and 2 |
| 24 | */ |
| 25 | |
| 26 | #include <inttypes.h> |
| 27 | |
| 28 | #include "libavutil/intfloat.h" |
| 29 | #include "libavutil/intreadwrite.h" |
| 30 | #include "avcodec.h" |
| 31 | #include "mss12.h" |
| 32 | |
| 33 | enum SplitMode { |
| 34 | SPLIT_VERT = 0, |
| 35 | SPLIT_HOR, |
| 36 | SPLIT_NONE |
| 37 | }; |
| 38 | |
| 39 | static const int sec_order_sizes[4] = { 1, 7, 6, 1 }; |
| 40 | |
| 41 | enum ContextDirection { |
| 42 | TOP_LEFT = 0, |
| 43 | TOP, |
| 44 | TOP_RIGHT, |
| 45 | LEFT |
| 46 | }; |
| 47 | |
| 48 | static int model_calc_threshold(Model *m) |
| 49 | { |
| 50 | int thr; |
| 51 | |
| 52 | thr = 2 * m->weights[m->num_syms] - 1; |
| 53 | thr = ((thr >> 1) + 4 * m->cum_prob[0]) / thr; |
| 54 | |
| 55 | return FFMIN(thr, 0x3FFF); |
| 56 | } |
| 57 | |
| 58 | static void model_reset(Model *m) |
| 59 | { |
| 60 | int i; |
| 61 | |
| 62 | for (i = 0; i <= m->num_syms; i++) { |
| 63 | m->weights[i] = 1; |
| 64 | m->cum_prob[i] = m->num_syms - i; |
| 65 | } |
| 66 | m->weights[0] = 0; |
| 67 | for (i = 0; i < m->num_syms; i++) |
| 68 | m->idx2sym[i + 1] = i; |
| 69 | } |
| 70 | |
| 71 | static av_cold void model_init(Model *m, int num_syms, int thr_weight) |
| 72 | { |
| 73 | m->num_syms = num_syms; |
| 74 | m->thr_weight = thr_weight; |
| 75 | m->threshold = num_syms * thr_weight; |
| 76 | } |
| 77 | |
| 78 | static void model_rescale_weights(Model *m) |
| 79 | { |
| 80 | int i; |
| 81 | int cum_prob; |
| 82 | |
| 83 | if (m->thr_weight == THRESH_ADAPTIVE) |
| 84 | m->threshold = model_calc_threshold(m); |
| 85 | while (m->cum_prob[0] > m->threshold) { |
| 86 | cum_prob = 0; |
| 87 | for (i = m->num_syms; i >= 0; i--) { |
| 88 | m->cum_prob[i] = cum_prob; |
| 89 | m->weights[i] = (m->weights[i] + 1) >> 1; |
| 90 | cum_prob += m->weights[i]; |
| 91 | } |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | void ff_mss12_model_update(Model *m, int val) |
| 96 | { |
| 97 | int i; |
| 98 | |
| 99 | if (m->weights[val] == m->weights[val - 1]) { |
| 100 | for (i = val; m->weights[i - 1] == m->weights[val]; i--); |
| 101 | if (i != val) { |
| 102 | int sym1, sym2; |
| 103 | |
| 104 | sym1 = m->idx2sym[val]; |
| 105 | sym2 = m->idx2sym[i]; |
| 106 | |
| 107 | m->idx2sym[val] = sym2; |
| 108 | m->idx2sym[i] = sym1; |
| 109 | |
| 110 | val = i; |
| 111 | } |
| 112 | } |
| 113 | m->weights[val]++; |
| 114 | for (i = val - 1; i >= 0; i--) |
| 115 | m->cum_prob[i]++; |
| 116 | model_rescale_weights(m); |
| 117 | } |
| 118 | |
| 119 | static void pixctx_reset(PixContext *ctx) |
| 120 | { |
| 121 | int i, j; |
| 122 | |
| 123 | if (!ctx->special_initial_cache) |
| 124 | for (i = 0; i < ctx->cache_size; i++) |
| 125 | ctx->cache[i] = i; |
| 126 | else { |
| 127 | ctx->cache[0] = 1; |
| 128 | ctx->cache[1] = 2; |
| 129 | ctx->cache[2] = 4; |
| 130 | } |
| 131 | |
| 132 | model_reset(&ctx->cache_model); |
| 133 | model_reset(&ctx->full_model); |
| 134 | |
| 135 | for (i = 0; i < 15; i++) |
| 136 | for (j = 0; j < 4; j++) |
| 137 | model_reset(&ctx->sec_models[i][j]); |
| 138 | } |
| 139 | |
| 140 | static av_cold void pixctx_init(PixContext *ctx, int cache_size, |
| 141 | int full_model_syms, int special_initial_cache) |
| 142 | { |
| 143 | int i, j, k, idx; |
| 144 | |
| 145 | ctx->cache_size = cache_size + 4; |
| 146 | ctx->num_syms = cache_size; |
| 147 | ctx->special_initial_cache = special_initial_cache; |
| 148 | |
| 149 | model_init(&ctx->cache_model, ctx->num_syms + 1, THRESH_LOW); |
| 150 | model_init(&ctx->full_model, full_model_syms, THRESH_HIGH); |
| 151 | |
| 152 | for (i = 0, idx = 0; i < 4; i++) |
| 153 | for (j = 0; j < sec_order_sizes[i]; j++, idx++) |
| 154 | for (k = 0; k < 4; k++) |
| 155 | model_init(&ctx->sec_models[idx][k], 2 + i, |
| 156 | i ? THRESH_LOW : THRESH_ADAPTIVE); |
| 157 | } |
| 158 | |
| 159 | static av_always_inline int decode_pixel(ArithCoder *acoder, PixContext *pctx, |
| 160 | uint8_t *ngb, int num_ngb, int any_ngb) |
| 161 | { |
| 162 | int i, val, pix; |
| 163 | |
| 164 | val = acoder->get_model_sym(acoder, &pctx->cache_model); |
| 165 | if (val < pctx->num_syms) { |
| 166 | if (any_ngb) { |
| 167 | int idx, j; |
| 168 | |
| 169 | idx = 0; |
| 170 | for (i = 0; i < pctx->cache_size; i++) { |
| 171 | for (j = 0; j < num_ngb; j++) |
| 172 | if (pctx->cache[i] == ngb[j]) |
| 173 | break; |
| 174 | if (j == num_ngb) { |
| 175 | if (idx == val) |
| 176 | break; |
| 177 | idx++; |
| 178 | } |
| 179 | } |
| 180 | val = FFMIN(i, pctx->cache_size - 1); |
| 181 | } |
| 182 | pix = pctx->cache[val]; |
| 183 | } else { |
| 184 | pix = acoder->get_model_sym(acoder, &pctx->full_model); |
| 185 | for (i = 0; i < pctx->cache_size - 1; i++) |
| 186 | if (pctx->cache[i] == pix) |
| 187 | break; |
| 188 | val = i; |
| 189 | } |
| 190 | if (val) { |
| 191 | for (i = val; i > 0; i--) |
| 192 | pctx->cache[i] = pctx->cache[i - 1]; |
| 193 | pctx->cache[0] = pix; |
| 194 | } |
| 195 | |
| 196 | return pix; |
| 197 | } |
| 198 | |
| 199 | static int decode_pixel_in_context(ArithCoder *acoder, PixContext *pctx, |
| 200 | uint8_t *src, int stride, int x, int y, |
| 201 | int has_right) |
| 202 | { |
| 203 | uint8_t neighbours[4]; |
| 204 | uint8_t ref_pix[4]; |
| 205 | int nlen; |
| 206 | int layer = 0, sub; |
| 207 | int pix; |
| 208 | int i, j; |
| 209 | |
| 210 | if (!y) { |
| 211 | memset(neighbours, src[-1], 4); |
| 212 | } else { |
| 213 | neighbours[TOP] = src[-stride]; |
| 214 | if (!x) { |
| 215 | neighbours[TOP_LEFT] = neighbours[LEFT] = neighbours[TOP]; |
| 216 | } else { |
| 217 | neighbours[TOP_LEFT] = src[-stride - 1]; |
| 218 | neighbours[ LEFT] = src[-1]; |
| 219 | } |
| 220 | if (has_right) |
| 221 | neighbours[TOP_RIGHT] = src[-stride + 1]; |
| 222 | else |
| 223 | neighbours[TOP_RIGHT] = neighbours[TOP]; |
| 224 | } |
| 225 | |
| 226 | sub = 0; |
| 227 | if (x >= 2 && src[-2] == neighbours[LEFT]) |
| 228 | sub = 1; |
| 229 | if (y >= 2 && src[-2 * stride] == neighbours[TOP]) |
| 230 | sub |= 2; |
| 231 | |
| 232 | nlen = 1; |
| 233 | ref_pix[0] = neighbours[0]; |
| 234 | for (i = 1; i < 4; i++) { |
| 235 | for (j = 0; j < nlen; j++) |
| 236 | if (ref_pix[j] == neighbours[i]) |
| 237 | break; |
| 238 | if (j == nlen) |
| 239 | ref_pix[nlen++] = neighbours[i]; |
| 240 | } |
| 241 | |
| 242 | switch (nlen) { |
| 243 | case 1: |
| 244 | layer = 0; |
| 245 | break; |
| 246 | case 2: |
| 247 | if (neighbours[TOP] == neighbours[TOP_LEFT]) { |
| 248 | if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT]) |
| 249 | layer = 1; |
| 250 | else if (neighbours[LEFT] == neighbours[TOP_LEFT]) |
| 251 | layer = 2; |
| 252 | else |
| 253 | layer = 3; |
| 254 | } else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT]) { |
| 255 | if (neighbours[LEFT] == neighbours[TOP_LEFT]) |
| 256 | layer = 4; |
| 257 | else |
| 258 | layer = 5; |
| 259 | } else if (neighbours[LEFT] == neighbours[TOP_LEFT]) { |
| 260 | layer = 6; |
| 261 | } else { |
| 262 | layer = 7; |
| 263 | } |
| 264 | break; |
| 265 | case 3: |
| 266 | if (neighbours[TOP] == neighbours[TOP_LEFT]) |
| 267 | layer = 8; |
| 268 | else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT]) |
| 269 | layer = 9; |
| 270 | else if (neighbours[LEFT] == neighbours[TOP_LEFT]) |
| 271 | layer = 10; |
| 272 | else if (neighbours[TOP_RIGHT] == neighbours[TOP]) |
| 273 | layer = 11; |
| 274 | else if (neighbours[TOP] == neighbours[LEFT]) |
| 275 | layer = 12; |
| 276 | else |
| 277 | layer = 13; |
| 278 | break; |
| 279 | case 4: |
| 280 | layer = 14; |
| 281 | break; |
| 282 | } |
| 283 | |
| 284 | pix = acoder->get_model_sym(acoder, |
| 285 | &pctx->sec_models[layer][sub]); |
| 286 | if (pix < nlen) |
| 287 | return ref_pix[pix]; |
| 288 | else |
| 289 | return decode_pixel(acoder, pctx, ref_pix, nlen, 1); |
| 290 | } |
| 291 | |
| 292 | static int decode_region(ArithCoder *acoder, uint8_t *dst, uint8_t *rgb_pic, |
| 293 | int x, int y, int width, int height, int stride, |
| 294 | int rgb_stride, PixContext *pctx, const uint32_t *pal) |
| 295 | { |
| 296 | int i, j, p; |
| 297 | uint8_t *rgb_dst = rgb_pic + x * 3 + y * rgb_stride; |
| 298 | |
| 299 | dst += x + y * stride; |
| 300 | |
| 301 | for (j = 0; j < height; j++) { |
| 302 | for (i = 0; i < width; i++) { |
| 303 | if (!i && !j) |
| 304 | p = decode_pixel(acoder, pctx, NULL, 0, 0); |
| 305 | else |
| 306 | p = decode_pixel_in_context(acoder, pctx, dst + i, stride, |
| 307 | i, j, width - i - 1); |
| 308 | dst[i] = p; |
| 309 | |
| 310 | if (rgb_pic) |
| 311 | AV_WB24(rgb_dst + i * 3, pal[p]); |
| 312 | } |
| 313 | dst += stride; |
| 314 | rgb_dst += rgb_stride; |
| 315 | } |
| 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | static void copy_rectangles(MSS12Context const *c, |
| 321 | int x, int y, int width, int height) |
| 322 | { |
| 323 | int j; |
| 324 | |
| 325 | if (c->last_rgb_pic) |
| 326 | for (j = y; j < y + height; j++) { |
| 327 | memcpy(c->rgb_pic + j * c->rgb_stride + x * 3, |
| 328 | c->last_rgb_pic + j * c->rgb_stride + x * 3, |
| 329 | width * 3); |
| 330 | memcpy(c->pal_pic + j * c->pal_stride + x, |
| 331 | c->last_pal_pic + j * c->pal_stride + x, |
| 332 | width); |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | static int motion_compensation(MSS12Context const *c, |
| 337 | int x, int y, int width, int height) |
| 338 | { |
| 339 | if (x + c->mvX < 0 || x + c->mvX + width > c->avctx->width || |
| 340 | y + c->mvY < 0 || y + c->mvY + height > c->avctx->height || |
| 341 | !c->rgb_pic) |
| 342 | return -1; |
| 343 | else { |
| 344 | uint8_t *dst = c->pal_pic + x + y * c->pal_stride; |
| 345 | uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride; |
| 346 | uint8_t *src; |
| 347 | uint8_t *rgb_src; |
| 348 | int j; |
| 349 | x += c->mvX; |
| 350 | y += c->mvY; |
| 351 | if (c->last_rgb_pic) { |
| 352 | src = c->last_pal_pic + x + y * c->pal_stride; |
| 353 | rgb_src = c->last_rgb_pic + x * 3 + y * c->rgb_stride; |
| 354 | } else { |
| 355 | src = c->pal_pic + x + y * c->pal_stride; |
| 356 | rgb_src = c->rgb_pic + x * 3 + y * c->rgb_stride; |
| 357 | } |
| 358 | for (j = 0; j < height; j++) { |
| 359 | memmove(dst, src, width); |
| 360 | memmove(rgb_dst, rgb_src, width * 3); |
| 361 | dst += c->pal_stride; |
| 362 | src += c->pal_stride; |
| 363 | rgb_dst += c->rgb_stride; |
| 364 | rgb_src += c->rgb_stride; |
| 365 | } |
| 366 | } |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | static int decode_region_masked(MSS12Context const *c, ArithCoder *acoder, |
| 371 | uint8_t *dst, int stride, uint8_t *mask, |
| 372 | int mask_stride, int x, int y, |
| 373 | int width, int height, |
| 374 | PixContext *pctx) |
| 375 | { |
| 376 | int i, j, p; |
| 377 | uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride; |
| 378 | |
| 379 | dst += x + y * stride; |
| 380 | mask += x + y * mask_stride; |
| 381 | |
| 382 | for (j = 0; j < height; j++) { |
| 383 | for (i = 0; i < width; i++) { |
| 384 | if (c->avctx->err_recognition & AV_EF_EXPLODE && |
| 385 | ( c->rgb_pic && mask[i] != 0x01 && mask[i] != 0x02 && mask[i] != 0x04 || |
| 386 | !c->rgb_pic && mask[i] != 0x80 && mask[i] != 0xFF)) |
| 387 | return -1; |
| 388 | |
| 389 | if (mask[i] == 0x02) { |
| 390 | copy_rectangles(c, x + i, y + j, 1, 1); |
| 391 | } else if (mask[i] == 0x04) { |
| 392 | if (motion_compensation(c, x + i, y + j, 1, 1)) |
| 393 | return -1; |
| 394 | } else if (mask[i] != 0x80) { |
| 395 | if (!i && !j) |
| 396 | p = decode_pixel(acoder, pctx, NULL, 0, 0); |
| 397 | else |
| 398 | p = decode_pixel_in_context(acoder, pctx, dst + i, stride, |
| 399 | i, j, width - i - 1); |
| 400 | dst[i] = p; |
| 401 | if (c->rgb_pic) |
| 402 | AV_WB24(rgb_dst + i * 3, c->pal[p]); |
| 403 | } |
| 404 | } |
| 405 | dst += stride; |
| 406 | mask += mask_stride; |
| 407 | rgb_dst += c->rgb_stride; |
| 408 | } |
| 409 | |
| 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | static av_cold void slicecontext_init(SliceContext *sc, |
| 414 | int version, int full_model_syms) |
| 415 | { |
| 416 | model_init(&sc->intra_region, 2, THRESH_ADAPTIVE); |
| 417 | model_init(&sc->inter_region, 2, THRESH_ADAPTIVE); |
| 418 | model_init(&sc->split_mode, 3, THRESH_HIGH); |
| 419 | model_init(&sc->edge_mode, 2, THRESH_HIGH); |
| 420 | model_init(&sc->pivot, 3, THRESH_LOW); |
| 421 | |
| 422 | pixctx_init(&sc->intra_pix_ctx, 8, full_model_syms, 0); |
| 423 | |
| 424 | pixctx_init(&sc->inter_pix_ctx, version ? 3 : 2, |
| 425 | full_model_syms, version ? 1 : 0); |
| 426 | } |
| 427 | |
| 428 | void ff_mss12_slicecontext_reset(SliceContext *sc) |
| 429 | { |
| 430 | model_reset(&sc->intra_region); |
| 431 | model_reset(&sc->inter_region); |
| 432 | model_reset(&sc->split_mode); |
| 433 | model_reset(&sc->edge_mode); |
| 434 | model_reset(&sc->pivot); |
| 435 | pixctx_reset(&sc->intra_pix_ctx); |
| 436 | pixctx_reset(&sc->inter_pix_ctx); |
| 437 | } |
| 438 | |
| 439 | static int decode_pivot(SliceContext *sc, ArithCoder *acoder, int base) |
| 440 | { |
| 441 | int val, inv; |
| 442 | |
| 443 | inv = acoder->get_model_sym(acoder, &sc->edge_mode); |
| 444 | val = acoder->get_model_sym(acoder, &sc->pivot) + 1; |
| 445 | |
| 446 | if (val > 2) { |
| 447 | if ((base + 1) / 2 - 2 <= 0) |
| 448 | return -1; |
| 449 | |
| 450 | val = acoder->get_number(acoder, (base + 1) / 2 - 2) + 3; |
| 451 | } |
| 452 | |
| 453 | if ((unsigned)val >= base) |
| 454 | return -1; |
| 455 | |
| 456 | return inv ? base - val : val; |
| 457 | } |
| 458 | |
| 459 | static int decode_region_intra(SliceContext *sc, ArithCoder *acoder, |
| 460 | int x, int y, int width, int height) |
| 461 | { |
| 462 | MSS12Context const *c = sc->c; |
| 463 | int mode; |
| 464 | |
| 465 | mode = acoder->get_model_sym(acoder, &sc->intra_region); |
| 466 | |
| 467 | if (!mode) { |
| 468 | int i, j, pix, rgb_pix; |
| 469 | int stride = c->pal_stride; |
| 470 | int rgb_stride = c->rgb_stride; |
| 471 | uint8_t *dst = c->pal_pic + x + y * stride; |
| 472 | uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * rgb_stride; |
| 473 | |
| 474 | pix = decode_pixel(acoder, &sc->intra_pix_ctx, NULL, 0, 0); |
| 475 | rgb_pix = c->pal[pix]; |
| 476 | for (i = 0; i < height; i++, dst += stride, rgb_dst += rgb_stride) { |
| 477 | memset(dst, pix, width); |
| 478 | if (c->rgb_pic) |
| 479 | for (j = 0; j < width * 3; j += 3) |
| 480 | AV_WB24(rgb_dst + j, rgb_pix); |
| 481 | } |
| 482 | } else { |
| 483 | return decode_region(acoder, c->pal_pic, c->rgb_pic, |
| 484 | x, y, width, height, c->pal_stride, c->rgb_stride, |
| 485 | &sc->intra_pix_ctx, &c->pal[0]); |
| 486 | } |
| 487 | |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | static int decode_region_inter(SliceContext *sc, ArithCoder *acoder, |
| 492 | int x, int y, int width, int height) |
| 493 | { |
| 494 | MSS12Context const *c = sc->c; |
| 495 | int mode; |
| 496 | |
| 497 | mode = acoder->get_model_sym(acoder, &sc->inter_region); |
| 498 | |
| 499 | if (!mode) { |
| 500 | mode = decode_pixel(acoder, &sc->inter_pix_ctx, NULL, 0, 0); |
| 501 | |
| 502 | if (c->avctx->err_recognition & AV_EF_EXPLODE && |
| 503 | ( c->rgb_pic && mode != 0x01 && mode != 0x02 && mode != 0x04 || |
| 504 | !c->rgb_pic && mode != 0x80 && mode != 0xFF)) |
| 505 | return -1; |
| 506 | |
| 507 | if (mode == 0x02) |
| 508 | copy_rectangles(c, x, y, width, height); |
| 509 | else if (mode == 0x04) |
| 510 | return motion_compensation(c, x, y, width, height); |
| 511 | else if (mode != 0x80) |
| 512 | return decode_region_intra(sc, acoder, x, y, width, height); |
| 513 | } else { |
| 514 | if (decode_region(acoder, c->mask, NULL, |
| 515 | x, y, width, height, c->mask_stride, 0, |
| 516 | &sc->inter_pix_ctx, &c->pal[0]) < 0) |
| 517 | return -1; |
| 518 | return decode_region_masked(c, acoder, c->pal_pic, |
| 519 | c->pal_stride, c->mask, |
| 520 | c->mask_stride, |
| 521 | x, y, width, height, |
| 522 | &sc->intra_pix_ctx); |
| 523 | } |
| 524 | |
| 525 | return 0; |
| 526 | } |
| 527 | |
| 528 | int ff_mss12_decode_rect(SliceContext *sc, ArithCoder *acoder, |
| 529 | int x, int y, int width, int height) |
| 530 | { |
| 531 | int mode, pivot; |
| 532 | |
| 533 | mode = acoder->get_model_sym(acoder, &sc->split_mode); |
| 534 | |
| 535 | switch (mode) { |
| 536 | case SPLIT_VERT: |
| 537 | if ((pivot = decode_pivot(sc, acoder, height)) < 1) |
| 538 | return -1; |
| 539 | if (ff_mss12_decode_rect(sc, acoder, x, y, width, pivot)) |
| 540 | return -1; |
| 541 | if (ff_mss12_decode_rect(sc, acoder, x, y + pivot, width, height - pivot)) |
| 542 | return -1; |
| 543 | break; |
| 544 | case SPLIT_HOR: |
| 545 | if ((pivot = decode_pivot(sc, acoder, width)) < 1) |
| 546 | return -1; |
| 547 | if (ff_mss12_decode_rect(sc, acoder, x, y, pivot, height)) |
| 548 | return -1; |
| 549 | if (ff_mss12_decode_rect(sc, acoder, x + pivot, y, width - pivot, height)) |
| 550 | return -1; |
| 551 | break; |
| 552 | case SPLIT_NONE: |
| 553 | if (sc->c->keyframe) |
| 554 | return decode_region_intra(sc, acoder, x, y, width, height); |
| 555 | else |
| 556 | return decode_region_inter(sc, acoder, x, y, width, height); |
| 557 | default: |
| 558 | return -1; |
| 559 | } |
| 560 | |
| 561 | return 0; |
| 562 | } |
| 563 | |
| 564 | av_cold int ff_mss12_decode_init(MSS12Context *c, int version, |
| 565 | SliceContext* sc1, SliceContext *sc2) |
| 566 | { |
| 567 | AVCodecContext *avctx = c->avctx; |
| 568 | int i; |
| 569 | |
| 570 | if (avctx->extradata_size < 52 + 256 * 3) { |
| 571 | av_log(avctx, AV_LOG_ERROR, "Insufficient extradata size %d\n", |
| 572 | avctx->extradata_size); |
| 573 | return AVERROR_INVALIDDATA; |
| 574 | } |
| 575 | |
| 576 | if (AV_RB32(avctx->extradata) < avctx->extradata_size) { |
| 577 | av_log(avctx, AV_LOG_ERROR, |
| 578 | "Insufficient extradata size: expected %"PRIu32" got %d\n", |
| 579 | AV_RB32(avctx->extradata), |
| 580 | avctx->extradata_size); |
| 581 | return AVERROR_INVALIDDATA; |
| 582 | } |
| 583 | |
| 584 | avctx->coded_width = AV_RB32(avctx->extradata + 20); |
| 585 | avctx->coded_height = AV_RB32(avctx->extradata + 24); |
| 586 | if (avctx->coded_width > 4096 || avctx->coded_height > 4096) { |
| 587 | av_log(avctx, AV_LOG_ERROR, "Frame dimensions %dx%d too large", |
| 588 | avctx->coded_width, avctx->coded_height); |
| 589 | return AVERROR_INVALIDDATA; |
| 590 | } |
| 591 | if (avctx->coded_width < 1 || avctx->coded_height < 1) { |
| 592 | av_log(avctx, AV_LOG_ERROR, "Frame dimensions %dx%d too small", |
| 593 | avctx->coded_width, avctx->coded_height); |
| 594 | return AVERROR_INVALIDDATA; |
| 595 | } |
| 596 | |
| 597 | av_log(avctx, AV_LOG_DEBUG, "Encoder version %"PRIu32".%"PRIu32"\n", |
| 598 | AV_RB32(avctx->extradata + 4), AV_RB32(avctx->extradata + 8)); |
| 599 | if (version != AV_RB32(avctx->extradata + 4) > 1) { |
| 600 | av_log(avctx, AV_LOG_ERROR, |
| 601 | "Header version doesn't match codec tag\n"); |
| 602 | return -1; |
| 603 | } |
| 604 | |
| 605 | c->free_colours = AV_RB32(avctx->extradata + 48); |
| 606 | if ((unsigned)c->free_colours > 256) { |
| 607 | av_log(avctx, AV_LOG_ERROR, |
| 608 | "Incorrect number of changeable palette entries: %d\n", |
| 609 | c->free_colours); |
| 610 | return AVERROR_INVALIDDATA; |
| 611 | } |
| 612 | av_log(avctx, AV_LOG_DEBUG, "%d free colour(s)\n", c->free_colours); |
| 613 | |
| 614 | av_log(avctx, AV_LOG_DEBUG, "Display dimensions %"PRIu32"x%"PRIu32"\n", |
| 615 | AV_RB32(avctx->extradata + 12), AV_RB32(avctx->extradata + 16)); |
| 616 | av_log(avctx, AV_LOG_DEBUG, "Coded dimensions %dx%d\n", |
| 617 | avctx->coded_width, avctx->coded_height); |
| 618 | av_log(avctx, AV_LOG_DEBUG, "%g frames per second\n", |
| 619 | av_int2float(AV_RB32(avctx->extradata + 28))); |
| 620 | av_log(avctx, AV_LOG_DEBUG, "Bitrate %"PRIu32" bps\n", |
| 621 | AV_RB32(avctx->extradata + 32)); |
| 622 | av_log(avctx, AV_LOG_DEBUG, "Max. lead time %g ms\n", |
| 623 | av_int2float(AV_RB32(avctx->extradata + 36))); |
| 624 | av_log(avctx, AV_LOG_DEBUG, "Max. lag time %g ms\n", |
| 625 | av_int2float(AV_RB32(avctx->extradata + 40))); |
| 626 | av_log(avctx, AV_LOG_DEBUG, "Max. seek time %g ms\n", |
| 627 | av_int2float(AV_RB32(avctx->extradata + 44))); |
| 628 | |
| 629 | if (version) { |
| 630 | if (avctx->extradata_size < 60 + 256 * 3) { |
| 631 | av_log(avctx, AV_LOG_ERROR, |
| 632 | "Insufficient extradata size %d for v2\n", |
| 633 | avctx->extradata_size); |
| 634 | return AVERROR_INVALIDDATA; |
| 635 | } |
| 636 | |
| 637 | c->slice_split = AV_RB32(avctx->extradata + 52); |
| 638 | av_log(avctx, AV_LOG_DEBUG, "Slice split %d\n", c->slice_split); |
| 639 | |
| 640 | c->full_model_syms = AV_RB32(avctx->extradata + 56); |
| 641 | if (c->full_model_syms < 2 || c->full_model_syms > 256) { |
| 642 | av_log(avctx, AV_LOG_ERROR, |
| 643 | "Incorrect number of used colours %d\n", |
| 644 | c->full_model_syms); |
| 645 | return AVERROR_INVALIDDATA; |
| 646 | } |
| 647 | av_log(avctx, AV_LOG_DEBUG, "Used colours %d\n", |
| 648 | c->full_model_syms); |
| 649 | } else { |
| 650 | c->slice_split = 0; |
| 651 | c->full_model_syms = 256; |
| 652 | } |
| 653 | |
| 654 | for (i = 0; i < 256; i++) |
| 655 | c->pal[i] = 0xFFU << 24 | AV_RB24(avctx->extradata + 52 + |
| 656 | (version ? 8 : 0) + i * 3); |
| 657 | |
| 658 | c->mask_stride = FFALIGN(avctx->width, 16); |
| 659 | c->mask = av_malloc(c->mask_stride * avctx->height); |
| 660 | if (!c->mask) { |
| 661 | av_log(avctx, AV_LOG_ERROR, "Cannot allocate mask plane\n"); |
| 662 | return AVERROR(ENOMEM); |
| 663 | } |
| 664 | |
| 665 | sc1->c = c; |
| 666 | slicecontext_init(sc1, version, c->full_model_syms); |
| 667 | if (c->slice_split) { |
| 668 | sc2->c = c; |
| 669 | slicecontext_init(sc2, version, c->full_model_syms); |
| 670 | } |
| 671 | c->corrupted = 1; |
| 672 | |
| 673 | return 0; |
| 674 | } |
| 675 | |
| 676 | av_cold int ff_mss12_decode_end(MSS12Context *c) |
| 677 | { |
| 678 | av_freep(&c->mask); |
| 679 | |
| 680 | return 0; |
| 681 | } |