| 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 | |
| 43 | static void vp6_parse_coeff(VP56Context *s); |
| 44 | static void vp6_parse_coeff_huffman(VP56Context *s); |
| 45 | |
| 46 | static 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 | |
| 178 | static 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 | |
| 189 | static 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 | |
| 207 | static 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 */ |
| 232 | static 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 | |
| 238 | static 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 | |
| 260 | static 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 | |
| 329 | static 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 | */ |
| 371 | static 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 | |
| 383 | static 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 | |
| 442 | static 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 | |
| 517 | static 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 | |
| 532 | static 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 | |
| 549 | static 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 | |
| 557 | static 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 | |
| 607 | static av_cold void vp6_decode_init_context(VP56Context *s); |
| 608 | |
| 609 | static 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 | |
| 630 | static 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 | |
| 642 | static av_cold void vp6_decode_free_context(VP56Context *s); |
| 643 | |
| 644 | static 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_freep(&s->alpha_context); |
| 655 | } |
| 656 | |
| 657 | return 0; |
| 658 | } |
| 659 | |
| 660 | static 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 | |
| 673 | AVCodec 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 */ |
| 686 | AVCodec 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 */ |
| 699 | AVCodec 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 | }; |