1/* 2 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org> 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 * VP6 compatible video decoder 24 * 25 * The VP6F decoder accepts an optional 1 byte extradata. It is composed of: 26 * - upper 4 bits: difference between encoded width and visible width 27 * - lower 4 bits: difference between encoded height and visible height 28 */ 29 30#include <stdlib.h> 31 32#include "avcodec.h" 33#include "get_bits.h" 34#include "huffman.h" 35#include "internal.h" 36 37#include "vp56.h" 38#include "vp56data.h" 39#include "vp6data.h" 40 41#define VP6_MAX_HUFF_SIZE 12 42 43static void vp6_parse_coeff(VP56Context *s); 44static void vp6_parse_coeff_huffman(VP56Context *s); 45 46static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size) 47{ 48 VP56RangeCoder *c = &s->c; 49 int parse_filter_info = 0; 50 int coeff_offset = 0; 51 int vrt_shift = 0; 52 int sub_version; 53 int rows, cols; 54 int res = 0; 55 int separated_coeff = buf[0] & 1; 56 57 s->frames[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80); 58 ff_vp56_init_dequant(s, (buf[0] >> 1) & 0x3F); 59 60 if (s->frames[VP56_FRAME_CURRENT]->key_frame) { 61 sub_version = buf[1] >> 3; 62 if (sub_version > 8) 63 return AVERROR_INVALIDDATA; 64 s->filter_header = buf[1] & 0x06; 65 if (buf[1] & 1) { 66 avpriv_report_missing_feature(s->avctx, "Interlacing"); 67 return AVERROR_PATCHWELCOME; 68 } 69 if (separated_coeff || !s->filter_header) { 70 coeff_offset = AV_RB16(buf+2) - 2; 71 buf += 2; 72 buf_size -= 2; 73 } 74 75 rows = buf[2]; /* number of stored macroblock rows */ 76 cols = buf[3]; /* number of stored macroblock cols */ 77 /* buf[4] is number of displayed macroblock rows */ 78 /* buf[5] is number of displayed macroblock cols */ 79 if (!rows || !cols) { 80 av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", cols << 4, rows << 4); 81 return AVERROR_INVALIDDATA; 82 } 83 84 if (!s->macroblocks || /* first frame */ 85 16*cols != s->avctx->coded_width || 86 16*rows != s->avctx->coded_height) { 87 if (s->avctx->extradata_size == 0 && 88 FFALIGN(s->avctx->width, 16) == 16 * cols && 89 FFALIGN(s->avctx->height, 16) == 16 * rows) { 90 // We assume this is properly signalled container cropping, 91 // in an F4V file. Just set the coded_width/height, don't 92 // touch the cropped ones. 93 s->avctx->coded_width = 16 * cols; 94 s->avctx->coded_height = 16 * rows; 95 } else { 96 int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows); 97 if (ret < 0) 98 return ret; 99 100 if (s->avctx->extradata_size == 1) { 101 s->avctx->width -= s->avctx->extradata[0] >> 4; 102 s->avctx->height -= s->avctx->extradata[0] & 0x0F; 103 } 104 } 105 res = VP56_SIZE_CHANGE; 106 } 107 108 ff_vp56_init_range_decoder(c, buf+6, buf_size-6); 109 vp56_rac_gets(c, 2); 110 111 parse_filter_info = s->filter_header; 112 if (sub_version < 8) 113 vrt_shift = 5; 114 s->sub_version = sub_version; 115 s->golden_frame = 0; 116 } else { 117 if (!s->sub_version || !s->avctx->coded_width || !s->avctx->coded_height) 118 return AVERROR_INVALIDDATA; 119 120 if (separated_coeff || !s->filter_header) { 121 coeff_offset = AV_RB16(buf+1) - 2; 122 buf += 2; 123 buf_size -= 2; 124 } 125 ff_vp56_init_range_decoder(c, buf+1, buf_size-1); 126 127 s->golden_frame = vp56_rac_get(c); 128 if (s->filter_header) { 129 s->deblock_filtering = vp56_rac_get(c); 130 if (s->deblock_filtering) 131 vp56_rac_get(c); 132 if (s->sub_version > 7) 133 parse_filter_info = vp56_rac_get(c); 134 } 135 } 136 137 if (parse_filter_info) { 138 if (vp56_rac_get(c)) { 139 s->filter_mode = 2; 140 s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift; 141 s->max_vector_length = 2 << vp56_rac_gets(c, 3); 142 } else if (vp56_rac_get(c)) { 143 s->filter_mode = 1; 144 } else { 145 s->filter_mode = 0; 146 } 147 if (s->sub_version > 7) 148 s->filter_selection = vp56_rac_gets(c, 4); 149 else 150 s->filter_selection = 16; 151 } 152 153 s->use_huffman = vp56_rac_get(c); 154 155 s->parse_coeff = vp6_parse_coeff; 156 if (coeff_offset) { 157 buf += coeff_offset; 158 buf_size -= coeff_offset; 159 if (buf_size < 0) { 160 if (s->frames[VP56_FRAME_CURRENT]->key_frame) 161 ff_set_dimensions(s->avctx, 0, 0); 162 return AVERROR_INVALIDDATA; 163 } 164 if (s->use_huffman) { 165 s->parse_coeff = vp6_parse_coeff_huffman; 166 init_get_bits(&s->gb, buf, buf_size<<3); 167 } else { 168 ff_vp56_init_range_decoder(&s->cc, buf, buf_size); 169 s->ccp = &s->cc; 170 } 171 } else { 172 s->ccp = &s->c; 173 } 174 175 return res; 176} 177 178static void vp6_coeff_order_table_init(VP56Context *s) 179{ 180 int i, pos, idx = 1; 181 182 s->modelp->coeff_index_to_pos[0] = 0; 183 for (i=0; i<16; i++) 184 for (pos=1; pos<64; pos++) 185 if (s->modelp->coeff_reorder[pos] == i) 186 s->modelp->coeff_index_to_pos[idx++] = pos; 187} 188 189static void vp6_default_models_init(VP56Context *s) 190{ 191 VP56Model *model = s->modelp; 192 193 model->vector_dct[0] = 0xA2; 194 model->vector_dct[1] = 0xA4; 195 model->vector_sig[0] = 0x80; 196 model->vector_sig[1] = 0x80; 197 198 memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats)); 199 memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv)); 200 memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv)); 201 memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv)); 202 memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder)); 203 204 vp6_coeff_order_table_init(s); 205} 206 207static void vp6_parse_vector_models(VP56Context *s) 208{ 209 VP56RangeCoder *c = &s->c; 210 VP56Model *model = s->modelp; 211 int comp, node; 212 213 for (comp=0; comp<2; comp++) { 214 if (vp56_rac_get_prob_branchy(c, vp6_sig_dct_pct[comp][0])) 215 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7); 216 if (vp56_rac_get_prob_branchy(c, vp6_sig_dct_pct[comp][1])) 217 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7); 218 } 219 220 for (comp=0; comp<2; comp++) 221 for (node=0; node<7; node++) 222 if (vp56_rac_get_prob_branchy(c, vp6_pdv_pct[comp][node])) 223 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7); 224 225 for (comp=0; comp<2; comp++) 226 for (node=0; node<8; node++) 227 if (vp56_rac_get_prob_branchy(c, vp6_fdv_pct[comp][node])) 228 model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7); 229} 230 231/* nodes must ascend by count, but with descending symbol order */ 232static int vp6_huff_cmp(const void *va, const void *vb) 233{ 234 const Node *a = va, *b = vb; 235 return (a->count - b->count)*16 + (b->sym - a->sym); 236} 237 238static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[], 239 const uint8_t *map, unsigned size, VLC *vlc) 240{ 241 Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size]; 242 int a, b, i; 243 244 /* first compute probabilities from model */ 245 tmp[0].count = 256; 246 for (i=0; i<size-1; i++) { 247 a = tmp[i].count * coeff_model[i] >> 8; 248 b = tmp[i].count * (255 - coeff_model[i]) >> 8; 249 nodes[map[2*i ]].count = a + !a; 250 nodes[map[2*i+1]].count = b + !b; 251 } 252 253 ff_free_vlc(vlc); 254 /* then build the huffman tree according to probabilities */ 255 return ff_huff_build_tree(s->avctx, vlc, size, FF_HUFFMAN_BITS, 256 nodes, vp6_huff_cmp, 257 FF_HUFFMAN_FLAG_HNODE_FIRST); 258} 259 260static int vp6_parse_coeff_models(VP56Context *s) 261{ 262 VP56RangeCoder *c = &s->c; 263 VP56Model *model = s->modelp; 264 int def_prob[11]; 265 int node, cg, ctx, pos; 266 int ct; /* code type */ 267 int pt; /* plane type (0 for Y, 1 for U or V) */ 268 269 memset(def_prob, 0x80, sizeof(def_prob)); 270 271 for (pt=0; pt<2; pt++) 272 for (node=0; node<11; node++) 273 if (vp56_rac_get_prob_branchy(c, vp6_dccv_pct[pt][node])) { 274 def_prob[node] = vp56_rac_gets_nn(c, 7); 275 model->coeff_dccv[pt][node] = def_prob[node]; 276 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { 277 model->coeff_dccv[pt][node] = def_prob[node]; 278 } 279 280 if (vp56_rac_get(c)) { 281 for (pos=1; pos<64; pos++) 282 if (vp56_rac_get_prob_branchy(c, vp6_coeff_reorder_pct[pos])) 283 model->coeff_reorder[pos] = vp56_rac_gets(c, 4); 284 vp6_coeff_order_table_init(s); 285 } 286 287 for (cg=0; cg<2; cg++) 288 for (node=0; node<14; node++) 289 if (vp56_rac_get_prob_branchy(c, vp6_runv_pct[cg][node])) 290 model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7); 291 292 for (ct=0; ct<3; ct++) 293 for (pt=0; pt<2; pt++) 294 for (cg=0; cg<6; cg++) 295 for (node=0; node<11; node++) 296 if (vp56_rac_get_prob_branchy(c, vp6_ract_pct[ct][pt][cg][node])) { 297 def_prob[node] = vp56_rac_gets_nn(c, 7); 298 model->coeff_ract[pt][ct][cg][node] = def_prob[node]; 299 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { 300 model->coeff_ract[pt][ct][cg][node] = def_prob[node]; 301 } 302 303 if (s->use_huffman) { 304 for (pt=0; pt<2; pt++) { 305 if (vp6_build_huff_tree(s, model->coeff_dccv[pt], 306 vp6_huff_coeff_map, 12, &s->dccv_vlc[pt])) 307 return -1; 308 if (vp6_build_huff_tree(s, model->coeff_runv[pt], 309 vp6_huff_run_map, 9, &s->runv_vlc[pt])) 310 return -1; 311 for (ct=0; ct<3; ct++) 312 for (cg = 0; cg < 6; cg++) 313 if (vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg], 314 vp6_huff_coeff_map, 12, 315 &s->ract_vlc[pt][ct][cg])) 316 return -1; 317 } 318 memset(s->nb_null, 0, sizeof(s->nb_null)); 319 } else { 320 /* coeff_dcct is a linear combination of coeff_dccv */ 321 for (pt=0; pt<2; pt++) 322 for (ctx=0; ctx<3; ctx++) 323 for (node=0; node<5; node++) 324 model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255); 325 } 326 return 0; 327} 328 329static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect) 330{ 331 VP56RangeCoder *c = &s->c; 332 VP56Model *model = s->modelp; 333 int comp; 334 335 *vect = (VP56mv) {0,0}; 336 if (s->vector_candidate_pos < 2) 337 *vect = s->vector_candidate[0]; 338 339 for (comp=0; comp<2; comp++) { 340 int i, delta = 0; 341 342 if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) { 343 static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4}; 344 for (i=0; i<sizeof(prob_order); i++) { 345 int j = prob_order[i]; 346 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j; 347 } 348 if (delta & 0xF0) 349 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3; 350 else 351 delta |= 8; 352 } else { 353 delta = vp56_rac_get_tree(c, ff_vp56_pva_tree, 354 model->vector_pdv[comp]); 355 } 356 357 if (delta && vp56_rac_get_prob_branchy(c, model->vector_sig[comp])) 358 delta = -delta; 359 360 if (!comp) 361 vect->x += delta; 362 else 363 vect->y += delta; 364 } 365} 366 367/** 368 * Read number of consecutive blocks with null DC or AC. 369 * This value is < 74. 370 */ 371static unsigned vp6_get_nb_null(VP56Context *s) 372{ 373 unsigned val = get_bits(&s->gb, 2); 374 if (val == 2) 375 val += get_bits(&s->gb, 2); 376 else if (val == 3) { 377 val = get_bits1(&s->gb) << 2; 378 val = 6+val + get_bits(&s->gb, 2+val); 379 } 380 return val; 381} 382 383static void vp6_parse_coeff_huffman(VP56Context *s) 384{ 385 VP56Model *model = s->modelp; 386 uint8_t *permute = s->idct_scantable; 387 VLC *vlc_coeff; 388 int coeff, sign, coeff_idx; 389 int b, cg, idx; 390 int pt = 0; /* plane type (0 for Y, 1 for U or V) */ 391 392 for (b=0; b<6; b++) { 393 int ct = 0; /* code type */ 394 if (b > 3) pt = 1; 395 vlc_coeff = &s->dccv_vlc[pt]; 396 397 for (coeff_idx = 0;;) { 398 int run = 1; 399 if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) { 400 s->nb_null[coeff_idx][pt]--; 401 if (coeff_idx) 402 break; 403 } else { 404 if (get_bits_left(&s->gb) <= 0) 405 return; 406 coeff = get_vlc2(&s->gb, vlc_coeff->table, FF_HUFFMAN_BITS, 3); 407 if (coeff == 0) { 408 if (coeff_idx) { 409 int pt = (coeff_idx >= 6); 410 run += get_vlc2(&s->gb, s->runv_vlc[pt].table, FF_HUFFMAN_BITS, 3); 411 if (run >= 9) 412 run += get_bits(&s->gb, 6); 413 } else 414 s->nb_null[0][pt] = vp6_get_nb_null(s); 415 ct = 0; 416 } else if (coeff == 11) { /* end of block */ 417 if (coeff_idx == 1) /* first AC coeff ? */ 418 s->nb_null[1][pt] = vp6_get_nb_null(s); 419 break; 420 } else { 421 int coeff2 = ff_vp56_coeff_bias[coeff]; 422 if (coeff > 4) 423 coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11); 424 ct = 1 + (coeff2 > 1); 425 sign = get_bits1(&s->gb); 426 coeff2 = (coeff2 ^ -sign) + sign; 427 if (coeff_idx) 428 coeff2 *= s->dequant_ac; 429 idx = model->coeff_index_to_pos[coeff_idx]; 430 s->block_coeff[b][permute[idx]] = coeff2; 431 } 432 } 433 coeff_idx+=run; 434 if (coeff_idx >= 64) 435 break; 436 cg = FFMIN(vp6_coeff_groups[coeff_idx], 3); 437 vlc_coeff = &s->ract_vlc[pt][ct][cg]; 438 } 439 } 440} 441 442static void vp6_parse_coeff(VP56Context *s) 443{ 444 VP56RangeCoder *c = s->ccp; 445 VP56Model *model = s->modelp; 446 uint8_t *permute = s->idct_scantable; 447 uint8_t *model1, *model2, *model3; 448 int coeff, sign, coeff_idx; 449 int b, i, cg, idx, ctx; 450 int pt = 0; /* plane type (0 for Y, 1 for U or V) */ 451 452 for (b=0; b<6; b++) { 453 int ct = 1; /* code type */ 454 int run = 1; 455 456 if (b > 3) pt = 1; 457 458 ctx = s->left_block[ff_vp56_b6to4[b]].not_null_dc 459 + s->above_blocks[s->above_block_idx[b]].not_null_dc; 460 model1 = model->coeff_dccv[pt]; 461 model2 = model->coeff_dcct[pt][ctx]; 462 463 coeff_idx = 0; 464 for (;;) { 465 if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob_branchy(c, model2[0])) { 466 /* parse a coeff */ 467 if (vp56_rac_get_prob_branchy(c, model2[2])) { 468 if (vp56_rac_get_prob_branchy(c, model2[3])) { 469 idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1); 470 coeff = ff_vp56_coeff_bias[idx+5]; 471 for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--) 472 coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i; 473 } else { 474 if (vp56_rac_get_prob_branchy(c, model2[4])) 475 coeff = 3 + vp56_rac_get_prob(c, model1[5]); 476 else 477 coeff = 2; 478 } 479 ct = 2; 480 } else { 481 ct = 1; 482 coeff = 1; 483 } 484 sign = vp56_rac_get(c); 485 coeff = (coeff ^ -sign) + sign; 486 if (coeff_idx) 487 coeff *= s->dequant_ac; 488 idx = model->coeff_index_to_pos[coeff_idx]; 489 s->block_coeff[b][permute[idx]] = coeff; 490 run = 1; 491 } else { 492 /* parse a run */ 493 ct = 0; 494 if (coeff_idx > 0) { 495 if (!vp56_rac_get_prob_branchy(c, model2[1])) 496 break; 497 498 model3 = model->coeff_runv[coeff_idx >= 6]; 499 run = vp56_rac_get_tree(c, vp6_pcr_tree, model3); 500 if (!run) 501 for (run=9, i=0; i<6; i++) 502 run += vp56_rac_get_prob(c, model3[i+8]) << i; 503 } 504 } 505 coeff_idx += run; 506 if (coeff_idx >= 64) 507 break; 508 cg = vp6_coeff_groups[coeff_idx]; 509 model1 = model2 = model->coeff_ract[pt][ct][cg]; 510 } 511 512 s->left_block[ff_vp56_b6to4[b]].not_null_dc = 513 s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0]; 514 } 515} 516 517static int vp6_block_variance(uint8_t *src, int stride) 518{ 519 int sum = 0, square_sum = 0; 520 int y, x; 521 522 for (y=0; y<8; y+=2) { 523 for (x=0; x<8; x+=2) { 524 sum += src[x]; 525 square_sum += src[x]*src[x]; 526 } 527 src += 2*stride; 528 } 529 return (16*square_sum - sum*sum) >> 8; 530} 531 532static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride, 533 int delta, const int16_t *weights) 534{ 535 int x, y; 536 537 for (y=0; y<8; y++) { 538 for (x=0; x<8; x++) { 539 dst[x] = av_clip_uint8(( src[x-delta ] * weights[0] 540 + src[x ] * weights[1] 541 + src[x+delta ] * weights[2] 542 + src[x+2*delta] * weights[3] + 64) >> 7); 543 } 544 src += stride; 545 dst += stride; 546 } 547} 548 549static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src, 550 int stride, int h_weight, int v_weight) 551{ 552 uint8_t *tmp = s->edge_emu_buffer+16; 553 s->h264chroma.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0); 554 s->h264chroma.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight); 555} 556 557static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src, 558 int offset1, int offset2, int stride, 559 VP56mv mv, int mask, int select, int luma) 560{ 561 int filter4 = 0; 562 int x8 = mv.x & mask; 563 int y8 = mv.y & mask; 564 565 if (luma) { 566 x8 *= 2; 567 y8 *= 2; 568 filter4 = s->filter_mode; 569 if (filter4 == 2) { 570 if (s->max_vector_length && 571 (FFABS(mv.x) > s->max_vector_length || 572 FFABS(mv.y) > s->max_vector_length)) { 573 filter4 = 0; 574 } else if (s->sample_variance_threshold 575 && (vp6_block_variance(src+offset1, stride) 576 < s->sample_variance_threshold)) { 577 filter4 = 0; 578 } 579 } 580 } 581 582 if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) { 583 offset1 = offset2; 584 } 585 586 if (filter4) { 587 if (!y8) { /* left or right combine */ 588 vp6_filter_hv4(dst, src+offset1, stride, 1, 589 vp6_block_copy_filter[select][x8]); 590 } else if (!x8) { /* above or below combine */ 591 vp6_filter_hv4(dst, src+offset1, stride, stride, 592 vp6_block_copy_filter[select][y8]); 593 } else { 594 s->vp56dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride, 595 vp6_block_copy_filter[select][x8], 596 vp6_block_copy_filter[select][y8]); 597 } 598 } else { 599 if (!x8 || !y8) { 600 s->h264chroma.put_h264_chroma_pixels_tab[0](dst, src + offset1, stride, 8, x8, y8); 601 } else { 602 vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8); 603 } 604 } 605} 606 607static av_cold void vp6_decode_init_context(VP56Context *s); 608 609static av_cold int vp6_decode_init(AVCodecContext *avctx) 610{ 611 VP56Context *s = avctx->priv_data; 612 int ret; 613 614 if ((ret = ff_vp56_init(avctx, avctx->codec->id == AV_CODEC_ID_VP6, 615 avctx->codec->id == AV_CODEC_ID_VP6A)) < 0) 616 return ret; 617 618 vp6_decode_init_context(s); 619 620 if (s->has_alpha) { 621 s->alpha_context = av_mallocz(sizeof(VP56Context)); 622 ff_vp56_init_context(avctx, s->alpha_context, 623 s->flip == -1, s->has_alpha); 624 vp6_decode_init_context(s->alpha_context); 625 } 626 627 return 0; 628} 629 630static av_cold void vp6_decode_init_context(VP56Context *s) 631{ 632 s->deblock_filtering = 0; 633 s->vp56_coord_div = vp6_coord_div; 634 s->parse_vector_adjustment = vp6_parse_vector_adjustment; 635 s->filter = vp6_filter; 636 s->default_models_init = vp6_default_models_init; 637 s->parse_vector_models = vp6_parse_vector_models; 638 s->parse_coeff_models = vp6_parse_coeff_models; 639 s->parse_header = vp6_parse_header; 640} 641 642static av_cold void vp6_decode_free_context(VP56Context *s); 643 644static av_cold int vp6_decode_free(AVCodecContext *avctx) 645{ 646 VP56Context *s = avctx->priv_data; 647 648 ff_vp56_free(avctx); 649 vp6_decode_free_context(s); 650 651 if (s->alpha_context) { 652 ff_vp56_free_context(s->alpha_context); 653 vp6_decode_free_context(s->alpha_context); 654 av_free(s->alpha_context); 655 } 656 657 return 0; 658} 659 660static av_cold void vp6_decode_free_context(VP56Context *s) 661{ 662 int pt, ct, cg; 663 664 for (pt=0; pt<2; pt++) { 665 ff_free_vlc(&s->dccv_vlc[pt]); 666 ff_free_vlc(&s->runv_vlc[pt]); 667 for (ct=0; ct<3; ct++) 668 for (cg=0; cg<6; cg++) 669 ff_free_vlc(&s->ract_vlc[pt][ct][cg]); 670 } 671} 672 673AVCodec ff_vp6_decoder = { 674 .name = "vp6", 675 .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"), 676 .type = AVMEDIA_TYPE_VIDEO, 677 .id = AV_CODEC_ID_VP6, 678 .priv_data_size = sizeof(VP56Context), 679 .init = vp6_decode_init, 680 .close = vp6_decode_free, 681 .decode = ff_vp56_decode_frame, 682 .capabilities = CODEC_CAP_DR1, 683}; 684 685/* flash version, not flipped upside-down */ 686AVCodec ff_vp6f_decoder = { 687 .name = "vp6f", 688 .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"), 689 .type = AVMEDIA_TYPE_VIDEO, 690 .id = AV_CODEC_ID_VP6F, 691 .priv_data_size = sizeof(VP56Context), 692 .init = vp6_decode_init, 693 .close = vp6_decode_free, 694 .decode = ff_vp56_decode_frame, 695 .capabilities = CODEC_CAP_DR1, 696}; 697 698/* flash version, not flipped upside-down, with alpha channel */ 699AVCodec ff_vp6a_decoder = { 700 .name = "vp6a", 701 .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"), 702 .type = AVMEDIA_TYPE_VIDEO, 703 .id = AV_CODEC_ID_VP6A, 704 .priv_data_size = sizeof(VP56Context), 705 .init = vp6_decode_init, 706 .close = vp6_decode_free, 707 .decode = ff_vp56_decode_frame, 708 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS, 709}; 710