1/** 2 * @file 3 * VP6 compatible video decoder 4 * 5 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org> 6 * 7 * The VP6F decoder accepts an optional 1 byte extradata. It is composed of: 8 * - upper 4bits: difference between encoded width and visible width 9 * - lower 4bits: difference between encoded height and visible height 10 * 11 * This file is part of FFmpeg. 12 * 13 * FFmpeg is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU Lesser General Public 15 * License as published by the Free Software Foundation; either 16 * version 2.1 of the License, or (at your option) any later version. 17 * 18 * FFmpeg is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 * Lesser General Public License for more details. 22 * 23 * You should have received a copy of the GNU Lesser General Public 24 * License along with FFmpeg; if not, write to the Free Software 25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 26 */ 27 28#include <stdlib.h> 29 30#include "avcodec.h" 31#include "dsputil.h" 32#include "get_bits.h" 33#include "huffman.h" 34 35#include "vp56.h" 36#include "vp56data.h" 37#include "vp6data.h" 38 39 40static void vp6_parse_coeff(VP56Context *s); 41static void vp6_parse_coeff_huffman(VP56Context *s); 42 43static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size, 44 int *golden_frame) 45{ 46 VP56RangeCoder *c = &s->c; 47 int parse_filter_info = 0; 48 int coeff_offset = 0; 49 int vrt_shift = 0; 50 int sub_version; 51 int rows, cols; 52 int res = 1; 53 int separated_coeff = buf[0] & 1; 54 55 s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80); 56 vp56_init_dequant(s, (buf[0] >> 1) & 0x3F); 57 58 if (s->framep[VP56_FRAME_CURRENT]->key_frame) { 59 sub_version = buf[1] >> 3; 60 if (sub_version > 8) 61 return 0; 62 s->filter_header = buf[1] & 0x06; 63 if (buf[1] & 1) { 64 av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n"); 65 return 0; 66 } 67 if (separated_coeff || !s->filter_header) { 68 coeff_offset = AV_RB16(buf+2) - 2; 69 buf += 2; 70 buf_size -= 2; 71 } 72 73 rows = buf[2]; /* number of stored macroblock rows */ 74 cols = buf[3]; /* number of stored macroblock cols */ 75 /* buf[4] is number of displayed macroblock rows */ 76 /* buf[5] is number of displayed macroblock cols */ 77 78 if (!s->macroblocks || /* first frame */ 79 16*cols != s->avctx->coded_width || 80 16*rows != s->avctx->coded_height) { 81 avcodec_set_dimensions(s->avctx, 16*cols, 16*rows); 82 if (s->avctx->extradata_size == 1) { 83 s->avctx->width -= s->avctx->extradata[0] >> 4; 84 s->avctx->height -= s->avctx->extradata[0] & 0x0F; 85 } 86 res = 2; 87 } 88 89 vp56_init_range_decoder(c, buf+6, buf_size-6); 90 vp56_rac_gets(c, 2); 91 92 parse_filter_info = s->filter_header; 93 if (sub_version < 8) 94 vrt_shift = 5; 95 s->sub_version = sub_version; 96 } else { 97 if (!s->sub_version) 98 return 0; 99 100 if (separated_coeff || !s->filter_header) { 101 coeff_offset = AV_RB16(buf+1) - 2; 102 buf += 2; 103 buf_size -= 2; 104 } 105 vp56_init_range_decoder(c, buf+1, buf_size-1); 106 107 *golden_frame = vp56_rac_get(c); 108 if (s->filter_header) { 109 s->deblock_filtering = vp56_rac_get(c); 110 if (s->deblock_filtering) 111 vp56_rac_get(c); 112 if (s->sub_version > 7) 113 parse_filter_info = vp56_rac_get(c); 114 } 115 } 116 117 if (parse_filter_info) { 118 if (vp56_rac_get(c)) { 119 s->filter_mode = 2; 120 s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift; 121 s->max_vector_length = 2 << vp56_rac_gets(c, 3); 122 } else if (vp56_rac_get(c)) { 123 s->filter_mode = 1; 124 } else { 125 s->filter_mode = 0; 126 } 127 if (s->sub_version > 7) 128 s->filter_selection = vp56_rac_gets(c, 4); 129 else 130 s->filter_selection = 16; 131 } 132 133 s->use_huffman = vp56_rac_get(c); 134 135 s->parse_coeff = vp6_parse_coeff; 136 if (coeff_offset) { 137 buf += coeff_offset; 138 buf_size -= coeff_offset; 139 if (buf_size < 0) 140 return 0; 141 if (s->use_huffman) { 142 s->parse_coeff = vp6_parse_coeff_huffman; 143 init_get_bits(&s->gb, buf, buf_size<<3); 144 } else { 145 vp56_init_range_decoder(&s->cc, buf, buf_size); 146 s->ccp = &s->cc; 147 } 148 } else { 149 s->ccp = &s->c; 150 } 151 152 return res; 153} 154 155static void vp6_coeff_order_table_init(VP56Context *s) 156{ 157 int i, pos, idx = 1; 158 159 s->modelp->coeff_index_to_pos[0] = 0; 160 for (i=0; i<16; i++) 161 for (pos=1; pos<64; pos++) 162 if (s->modelp->coeff_reorder[pos] == i) 163 s->modelp->coeff_index_to_pos[idx++] = pos; 164} 165 166static void vp6_default_models_init(VP56Context *s) 167{ 168 VP56Model *model = s->modelp; 169 170 model->vector_dct[0] = 0xA2; 171 model->vector_dct[1] = 0xA4; 172 model->vector_sig[0] = 0x80; 173 model->vector_sig[1] = 0x80; 174 175 memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats)); 176 memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv)); 177 memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv)); 178 memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv)); 179 memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder)); 180 181 vp6_coeff_order_table_init(s); 182} 183 184static void vp6_parse_vector_models(VP56Context *s) 185{ 186 VP56RangeCoder *c = &s->c; 187 VP56Model *model = s->modelp; 188 int comp, node; 189 190 for (comp=0; comp<2; comp++) { 191 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0])) 192 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7); 193 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1])) 194 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7); 195 } 196 197 for (comp=0; comp<2; comp++) 198 for (node=0; node<7; node++) 199 if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node])) 200 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7); 201 202 for (comp=0; comp<2; comp++) 203 for (node=0; node<8; node++) 204 if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node])) 205 model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7); 206} 207 208/* nodes must ascend by count, but with descending symbol order */ 209static int vp6_huff_cmp(const void *va, const void *vb) 210{ 211 const Node *a = va, *b = vb; 212 return (a->count - b->count)*16 + (b->sym - a->sym); 213} 214 215static void vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[], 216 const uint8_t *map, unsigned size, VLC *vlc) 217{ 218 Node nodes[2*size], *tmp = &nodes[size]; 219 int a, b, i; 220 221 /* first compute probabilities from model */ 222 tmp[0].count = 256; 223 for (i=0; i<size-1; i++) { 224 a = tmp[i].count * coeff_model[i] >> 8; 225 b = tmp[i].count * (255 - coeff_model[i]) >> 8; 226 nodes[map[2*i ]].count = a + !a; 227 nodes[map[2*i+1]].count = b + !b; 228 } 229 230 free_vlc(vlc); 231 /* then build the huffman tree accodring to probabilities */ 232 ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp, 233 FF_HUFFMAN_FLAG_HNODE_FIRST); 234} 235 236static void vp6_parse_coeff_models(VP56Context *s) 237{ 238 VP56RangeCoder *c = &s->c; 239 VP56Model *model = s->modelp; 240 int def_prob[11]; 241 int node, cg, ctx, pos; 242 int ct; /* code type */ 243 int pt; /* plane type (0 for Y, 1 for U or V) */ 244 245 memset(def_prob, 0x80, sizeof(def_prob)); 246 247 for (pt=0; pt<2; pt++) 248 for (node=0; node<11; node++) 249 if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) { 250 def_prob[node] = vp56_rac_gets_nn(c, 7); 251 model->coeff_dccv[pt][node] = def_prob[node]; 252 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) { 253 model->coeff_dccv[pt][node] = def_prob[node]; 254 } 255 256 if (vp56_rac_get(c)) { 257 for (pos=1; pos<64; pos++) 258 if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos])) 259 model->coeff_reorder[pos] = vp56_rac_gets(c, 4); 260 vp6_coeff_order_table_init(s); 261 } 262 263 for (cg=0; cg<2; cg++) 264 for (node=0; node<14; node++) 265 if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node])) 266 model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7); 267 268 for (ct=0; ct<3; ct++) 269 for (pt=0; pt<2; pt++) 270 for (cg=0; cg<6; cg++) 271 for (node=0; node<11; node++) 272 if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) { 273 def_prob[node] = vp56_rac_gets_nn(c, 7); 274 model->coeff_ract[pt][ct][cg][node] = def_prob[node]; 275 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) { 276 model->coeff_ract[pt][ct][cg][node] = def_prob[node]; 277 } 278 279 if (s->use_huffman) { 280 for (pt=0; pt<2; pt++) { 281 vp6_build_huff_tree(s, model->coeff_dccv[pt], 282 vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]); 283 vp6_build_huff_tree(s, model->coeff_runv[pt], 284 vp6_huff_run_map, 9, &s->runv_vlc[pt]); 285 for (ct=0; ct<3; ct++) 286 for (cg = 0; cg < 6; cg++) 287 vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg], 288 vp6_huff_coeff_map, 12, 289 &s->ract_vlc[pt][ct][cg]); 290 } 291 memset(s->nb_null, 0, sizeof(s->nb_null)); 292 } else { 293 /* coeff_dcct is a linear combination of coeff_dccv */ 294 for (pt=0; pt<2; pt++) 295 for (ctx=0; ctx<3; ctx++) 296 for (node=0; node<5; node++) 297 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); 298 } 299} 300 301static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect) 302{ 303 VP56RangeCoder *c = &s->c; 304 VP56Model *model = s->modelp; 305 int comp; 306 307 *vect = (VP56mv) {0,0}; 308 if (s->vector_candidate_pos < 2) 309 *vect = s->vector_candidate[0]; 310 311 for (comp=0; comp<2; comp++) { 312 int i, delta = 0; 313 314 if (vp56_rac_get_prob(c, model->vector_dct[comp])) { 315 static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4}; 316 for (i=0; i<sizeof(prob_order); i++) { 317 int j = prob_order[i]; 318 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j; 319 } 320 if (delta & 0xF0) 321 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3; 322 else 323 delta |= 8; 324 } else { 325 delta = vp56_rac_get_tree(c, vp56_pva_tree, 326 model->vector_pdv[comp]); 327 } 328 329 if (delta && vp56_rac_get_prob(c, model->vector_sig[comp])) 330 delta = -delta; 331 332 if (!comp) 333 vect->x += delta; 334 else 335 vect->y += delta; 336 } 337} 338 339/** 340 * Read number of consecutive blocks with null DC or AC. 341 * This value is < 74. 342 */ 343static unsigned vp6_get_nb_null(VP56Context *s) 344{ 345 unsigned val = get_bits(&s->gb, 2); 346 if (val == 2) 347 val += get_bits(&s->gb, 2); 348 else if (val == 3) { 349 val = get_bits1(&s->gb) << 2; 350 val = 6+val + get_bits(&s->gb, 2+val); 351 } 352 return val; 353} 354 355static void vp6_parse_coeff_huffman(VP56Context *s) 356{ 357 VP56Model *model = s->modelp; 358 uint8_t *permute = s->scantable.permutated; 359 VLC *vlc_coeff; 360 int coeff, sign, coeff_idx; 361 int b, cg, idx; 362 int pt = 0; /* plane type (0 for Y, 1 for U or V) */ 363 364 for (b=0; b<6; b++) { 365 int ct = 0; /* code type */ 366 if (b > 3) pt = 1; 367 vlc_coeff = &s->dccv_vlc[pt]; 368 369 for (coeff_idx=0; coeff_idx<64; ) { 370 int run = 1; 371 if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) { 372 s->nb_null[coeff_idx][pt]--; 373 if (coeff_idx) 374 break; 375 } else { 376 if (get_bits_count(&s->gb) >= s->gb.size_in_bits) 377 return; 378 coeff = get_vlc2(&s->gb, vlc_coeff->table, 9, 3); 379 if (coeff == 0) { 380 if (coeff_idx) { 381 int pt = (coeff_idx >= 6); 382 run += get_vlc2(&s->gb, s->runv_vlc[pt].table, 9, 3); 383 if (run >= 9) 384 run += get_bits(&s->gb, 6); 385 } else 386 s->nb_null[0][pt] = vp6_get_nb_null(s); 387 ct = 0; 388 } else if (coeff == 11) { /* end of block */ 389 if (coeff_idx == 1) /* first AC coeff ? */ 390 s->nb_null[1][pt] = vp6_get_nb_null(s); 391 break; 392 } else { 393 int coeff2 = vp56_coeff_bias[coeff]; 394 if (coeff > 4) 395 coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11); 396 ct = 1 + (coeff2 > 1); 397 sign = get_bits1(&s->gb); 398 coeff2 = (coeff2 ^ -sign) + sign; 399 if (coeff_idx) 400 coeff2 *= s->dequant_ac; 401 idx = model->coeff_index_to_pos[coeff_idx]; 402 s->block_coeff[b][permute[idx]] = coeff2; 403 } 404 } 405 coeff_idx+=run; 406 cg = FFMIN(vp6_coeff_groups[coeff_idx], 3); 407 vlc_coeff = &s->ract_vlc[pt][ct][cg]; 408 } 409 } 410} 411 412static void vp6_parse_coeff(VP56Context *s) 413{ 414 VP56RangeCoder *c = s->ccp; 415 VP56Model *model = s->modelp; 416 uint8_t *permute = s->scantable.permutated; 417 uint8_t *model1, *model2, *model3; 418 int coeff, sign, coeff_idx; 419 int b, i, cg, idx, ctx; 420 int pt = 0; /* plane type (0 for Y, 1 for U or V) */ 421 422 for (b=0; b<6; b++) { 423 int ct = 1; /* code type */ 424 int run = 1; 425 426 if (b > 3) pt = 1; 427 428 ctx = s->left_block[vp56_b6to4[b]].not_null_dc 429 + s->above_blocks[s->above_block_idx[b]].not_null_dc; 430 model1 = model->coeff_dccv[pt]; 431 model2 = model->coeff_dcct[pt][ctx]; 432 433 for (coeff_idx=0; coeff_idx<64; ) { 434 if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) { 435 /* parse a coeff */ 436 if (vp56_rac_get_prob(c, model2[2])) { 437 if (vp56_rac_get_prob(c, model2[3])) { 438 idx = vp56_rac_get_tree(c, vp56_pc_tree, model1); 439 coeff = vp56_coeff_bias[idx+5]; 440 for (i=vp56_coeff_bit_length[idx]; i>=0; i--) 441 coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i; 442 } else { 443 if (vp56_rac_get_prob(c, model2[4])) 444 coeff = 3 + vp56_rac_get_prob(c, model1[5]); 445 else 446 coeff = 2; 447 } 448 ct = 2; 449 } else { 450 ct = 1; 451 coeff = 1; 452 } 453 sign = vp56_rac_get(c); 454 coeff = (coeff ^ -sign) + sign; 455 if (coeff_idx) 456 coeff *= s->dequant_ac; 457 idx = model->coeff_index_to_pos[coeff_idx]; 458 s->block_coeff[b][permute[idx]] = coeff; 459 run = 1; 460 } else { 461 /* parse a run */ 462 ct = 0; 463 if (coeff_idx > 0) { 464 if (!vp56_rac_get_prob(c, model2[1])) 465 break; 466 467 model3 = model->coeff_runv[coeff_idx >= 6]; 468 run = vp56_rac_get_tree(c, vp6_pcr_tree, model3); 469 if (!run) 470 for (run=9, i=0; i<6; i++) 471 run += vp56_rac_get_prob(c, model3[i+8]) << i; 472 } 473 } 474 475 cg = vp6_coeff_groups[coeff_idx+=run]; 476 model1 = model2 = model->coeff_ract[pt][ct][cg]; 477 } 478 479 s->left_block[vp56_b6to4[b]].not_null_dc = 480 s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0]; 481 } 482} 483 484static int vp6_block_variance(uint8_t *src, int stride) 485{ 486 int sum = 0, square_sum = 0; 487 int y, x; 488 489 for (y=0; y<8; y+=2) { 490 for (x=0; x<8; x+=2) { 491 sum += src[x]; 492 square_sum += src[x]*src[x]; 493 } 494 src += 2*stride; 495 } 496 return (16*square_sum - sum*sum) >> 8; 497} 498 499static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride, 500 int delta, const int16_t *weights) 501{ 502 int x, y; 503 504 for (y=0; y<8; y++) { 505 for (x=0; x<8; x++) { 506 dst[x] = av_clip_uint8(( src[x-delta ] * weights[0] 507 + src[x ] * weights[1] 508 + src[x+delta ] * weights[2] 509 + src[x+2*delta] * weights[3] + 64) >> 7); 510 } 511 src += stride; 512 dst += stride; 513 } 514} 515 516static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src, 517 int stride, int h_weight, int v_weight) 518{ 519 uint8_t *tmp = s->edge_emu_buffer+16; 520 s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0); 521 s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight); 522} 523 524static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src, 525 int offset1, int offset2, int stride, 526 VP56mv mv, int mask, int select, int luma) 527{ 528 int filter4 = 0; 529 int x8 = mv.x & mask; 530 int y8 = mv.y & mask; 531 532 if (luma) { 533 x8 *= 2; 534 y8 *= 2; 535 filter4 = s->filter_mode; 536 if (filter4 == 2) { 537 if (s->max_vector_length && 538 (FFABS(mv.x) > s->max_vector_length || 539 FFABS(mv.y) > s->max_vector_length)) { 540 filter4 = 0; 541 } else if (s->sample_variance_threshold 542 && (vp6_block_variance(src+offset1, stride) 543 < s->sample_variance_threshold)) { 544 filter4 = 0; 545 } 546 } 547 } 548 549 if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) { 550 offset1 = offset2; 551 } 552 553 if (filter4) { 554 if (!y8) { /* left or right combine */ 555 vp6_filter_hv4(dst, src+offset1, stride, 1, 556 vp6_block_copy_filter[select][x8]); 557 } else if (!x8) { /* above or below combine */ 558 vp6_filter_hv4(dst, src+offset1, stride, stride, 559 vp6_block_copy_filter[select][y8]); 560 } else { 561 s->dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride, 562 vp6_block_copy_filter[select][x8], 563 vp6_block_copy_filter[select][y8]); 564 } 565 } else { 566 if (!x8 || !y8) { 567 s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8); 568 } else { 569 vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8); 570 } 571 } 572} 573 574static av_cold int vp6_decode_init(AVCodecContext *avctx) 575{ 576 VP56Context *s = avctx->priv_data; 577 578 vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6, 579 avctx->codec->id == CODEC_ID_VP6A); 580 s->vp56_coord_div = vp6_coord_div; 581 s->parse_vector_adjustment = vp6_parse_vector_adjustment; 582 s->filter = vp6_filter; 583 s->default_models_init = vp6_default_models_init; 584 s->parse_vector_models = vp6_parse_vector_models; 585 s->parse_coeff_models = vp6_parse_coeff_models; 586 s->parse_header = vp6_parse_header; 587 588 return 0; 589} 590 591static av_cold int vp6_decode_free(AVCodecContext *avctx) 592{ 593 VP56Context *s = avctx->priv_data; 594 int pt, ct, cg; 595 596 vp56_free(avctx); 597 598 for (pt=0; pt<2; pt++) { 599 free_vlc(&s->dccv_vlc[pt]); 600 free_vlc(&s->runv_vlc[pt]); 601 for (ct=0; ct<3; ct++) 602 for (cg=0; cg<6; cg++) 603 free_vlc(&s->ract_vlc[pt][ct][cg]); 604 } 605 return 0; 606} 607 608AVCodec vp6_decoder = { 609 "vp6", 610 AVMEDIA_TYPE_VIDEO, 611 CODEC_ID_VP6, 612 sizeof(VP56Context), 613 vp6_decode_init, 614 NULL, 615 vp6_decode_free, 616 vp56_decode_frame, 617 CODEC_CAP_DR1, 618 .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"), 619}; 620 621/* flash version, not flipped upside-down */ 622AVCodec vp6f_decoder = { 623 "vp6f", 624 AVMEDIA_TYPE_VIDEO, 625 CODEC_ID_VP6F, 626 sizeof(VP56Context), 627 vp6_decode_init, 628 NULL, 629 vp6_decode_free, 630 vp56_decode_frame, 631 CODEC_CAP_DR1, 632 .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"), 633}; 634 635/* flash version, not flipped upside-down, with alpha channel */ 636AVCodec vp6a_decoder = { 637 "vp6a", 638 AVMEDIA_TYPE_VIDEO, 639 CODEC_ID_VP6A, 640 sizeof(VP56Context), 641 vp6_decode_init, 642 NULL, 643 vp6_decode_free, 644 vp56_decode_frame, 645 CODEC_CAP_DR1, 646 .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"), 647}; 648