1/* 2 * Smacker decoder 3 * Copyright (c) 2006 Konstantin Shishkov 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/** 23 * @file libavcodec/smacker.c 24 * Smacker decoder 25 */ 26 27/* 28 * Based on http://wiki.multimedia.cx/index.php?title=Smacker 29 */ 30 31#include <stdio.h> 32#include <stdlib.h> 33 34#include "avcodec.h" 35 36#define ALT_BITSTREAM_READER_LE 37#include "bitstream.h" 38#include "bytestream.h" 39 40#define SMKTREE_BITS 9 41#define SMK_NODE 0x80000000 42 43/* 44 * Decoder context 45 */ 46typedef struct SmackVContext { 47 AVCodecContext *avctx; 48 AVFrame pic; 49 50 int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl; 51 int mmap_last[3], mclr_last[3], full_last[3], type_last[3]; 52} SmackVContext; 53 54/** 55 * Context used for code reconstructing 56 */ 57typedef struct HuffContext { 58 int length; 59 int maxlength; 60 int current; 61 uint32_t *bits; 62 int *lengths; 63 int *values; 64} HuffContext; 65 66/* common parameters used for decode_bigtree */ 67typedef struct DBCtx { 68 VLC *v1, *v2; 69 int *recode1, *recode2; 70 int escapes[3]; 71 int *last; 72 int lcur; 73} DBCtx; 74 75/* possible runs of blocks */ 76static const int block_runs[64] = { 77 1, 2, 3, 4, 5, 6, 7, 8, 78 9, 10, 11, 12, 13, 14, 15, 16, 79 17, 18, 19, 20, 21, 22, 23, 24, 80 25, 26, 27, 28, 29, 30, 31, 32, 81 33, 34, 35, 36, 37, 38, 39, 40, 82 41, 42, 43, 44, 45, 46, 47, 48, 83 49, 50, 51, 52, 53, 54, 55, 56, 84 57, 58, 59, 128, 256, 512, 1024, 2048 }; 85 86enum SmkBlockTypes { 87 SMK_BLK_MONO = 0, 88 SMK_BLK_FULL = 1, 89 SMK_BLK_SKIP = 2, 90 SMK_BLK_FILL = 3 }; 91 92/** 93 * Decode local frame tree 94 */ 95static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length) 96{ 97 if(!get_bits1(gb)){ //Leaf 98 if(hc->current >= 256){ 99 av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n"); 100 return -1; 101 } 102 if(length){ 103 hc->bits[hc->current] = prefix; 104 hc->lengths[hc->current] = length; 105 } else { 106 hc->bits[hc->current] = 0; 107 hc->lengths[hc->current] = 0; 108 } 109 hc->values[hc->current] = get_bits(gb, 8); 110 hc->current++; 111 if(hc->maxlength < length) 112 hc->maxlength = length; 113 return 0; 114 } else { //Node 115 int r; 116 length++; 117 r = smacker_decode_tree(gb, hc, prefix, length); 118 if(r) 119 return r; 120 return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length); 121 } 122} 123 124/** 125 * Decode header tree 126 */ 127static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx) 128{ 129 if(!get_bits1(gb)){ //Leaf 130 int val, i1, i2, b1, b2; 131 if(hc->current >= hc->length){ 132 av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n"); 133 return -1; 134 } 135 b1 = get_bits_count(gb); 136 i1 = get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3); 137 b1 = get_bits_count(gb) - b1; 138 b2 = get_bits_count(gb); 139 i2 = get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3); 140 b2 = get_bits_count(gb) - b2; 141 val = ctx->recode1[i1] | (ctx->recode2[i2] << 8); 142 if(val == ctx->escapes[0]) { 143 ctx->last[0] = hc->current; 144 val = 0; 145 } else if(val == ctx->escapes[1]) { 146 ctx->last[1] = hc->current; 147 val = 0; 148 } else if(val == ctx->escapes[2]) { 149 ctx->last[2] = hc->current; 150 val = 0; 151 } 152 153 hc->values[hc->current++] = val; 154 return 1; 155 } else { //Node 156 int r = 0, t; 157 158 t = hc->current++; 159 r = smacker_decode_bigtree(gb, hc, ctx); 160 if(r < 0) 161 return r; 162 hc->values[t] = SMK_NODE | r; 163 r++; 164 r += smacker_decode_bigtree(gb, hc, ctx); 165 return r; 166 } 167} 168 169/** 170 * Store large tree as FFmpeg's vlc codes 171 */ 172static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size) 173{ 174 int res; 175 HuffContext huff; 176 HuffContext tmp1, tmp2; 177 VLC vlc[2]; 178 int escapes[3]; 179 DBCtx ctx; 180 181 if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow 182 av_log(smk->avctx, AV_LOG_ERROR, "size too large\n"); 183 return -1; 184 } 185 186 tmp1.length = 256; 187 tmp1.maxlength = 0; 188 tmp1.current = 0; 189 tmp1.bits = av_mallocz(256 * 4); 190 tmp1.lengths = av_mallocz(256 * sizeof(int)); 191 tmp1.values = av_mallocz(256 * sizeof(int)); 192 193 tmp2.length = 256; 194 tmp2.maxlength = 0; 195 tmp2.current = 0; 196 tmp2.bits = av_mallocz(256 * 4); 197 tmp2.lengths = av_mallocz(256 * sizeof(int)); 198 tmp2.values = av_mallocz(256 * sizeof(int)); 199 200 memset(&vlc[0], 0, sizeof(VLC)); 201 memset(&vlc[1], 0, sizeof(VLC)); 202 203 if(get_bits1(gb)) { 204 smacker_decode_tree(gb, &tmp1, 0, 0); 205 skip_bits1(gb); 206 res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length, 207 tmp1.lengths, sizeof(int), sizeof(int), 208 tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE); 209 if(res < 0) { 210 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n"); 211 return -1; 212 } 213 } else { 214 av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n"); 215 } 216 if(get_bits1(gb)){ 217 smacker_decode_tree(gb, &tmp2, 0, 0); 218 skip_bits1(gb); 219 res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length, 220 tmp2.lengths, sizeof(int), sizeof(int), 221 tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE); 222 if(res < 0) { 223 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n"); 224 return -1; 225 } 226 } else { 227 av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n"); 228 } 229 230 escapes[0] = get_bits(gb, 8); 231 escapes[0] |= get_bits(gb, 8) << 8; 232 escapes[1] = get_bits(gb, 8); 233 escapes[1] |= get_bits(gb, 8) << 8; 234 escapes[2] = get_bits(gb, 8); 235 escapes[2] |= get_bits(gb, 8) << 8; 236 237 last[0] = last[1] = last[2] = -1; 238 239 ctx.escapes[0] = escapes[0]; 240 ctx.escapes[1] = escapes[1]; 241 ctx.escapes[2] = escapes[2]; 242 ctx.v1 = &vlc[0]; 243 ctx.v2 = &vlc[1]; 244 ctx.recode1 = tmp1.values; 245 ctx.recode2 = tmp2.values; 246 ctx.last = last; 247 248 huff.length = ((size + 3) >> 2) + 3; 249 huff.maxlength = 0; 250 huff.current = 0; 251 huff.values = av_mallocz(huff.length * sizeof(int)); 252 253 smacker_decode_bigtree(gb, &huff, &ctx); 254 skip_bits1(gb); 255 if(ctx.last[0] == -1) ctx.last[0] = huff.current++; 256 if(ctx.last[1] == -1) ctx.last[1] = huff.current++; 257 if(ctx.last[2] == -1) ctx.last[2] = huff.current++; 258 259 *recodes = huff.values; 260 261 if(vlc[0].table) 262 free_vlc(&vlc[0]); 263 if(vlc[1].table) 264 free_vlc(&vlc[1]); 265 av_free(tmp1.bits); 266 av_free(tmp1.lengths); 267 av_free(tmp1.values); 268 av_free(tmp2.bits); 269 av_free(tmp2.lengths); 270 av_free(tmp2.values); 271 272 return 0; 273} 274 275static int decode_header_trees(SmackVContext *smk) { 276 GetBitContext gb; 277 int mmap_size, mclr_size, full_size, type_size; 278 279 mmap_size = AV_RL32(smk->avctx->extradata); 280 mclr_size = AV_RL32(smk->avctx->extradata + 4); 281 full_size = AV_RL32(smk->avctx->extradata + 8); 282 type_size = AV_RL32(smk->avctx->extradata + 12); 283 284 init_get_bits(&gb, smk->avctx->extradata + 16, (smk->avctx->extradata_size - 16) * 8); 285 286 if(!get_bits1(&gb)) { 287 av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n"); 288 smk->mmap_tbl = av_malloc(sizeof(int) * 2); 289 smk->mmap_tbl[0] = 0; 290 smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1; 291 } else { 292 smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size); 293 } 294 if(!get_bits1(&gb)) { 295 av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n"); 296 smk->mclr_tbl = av_malloc(sizeof(int) * 2); 297 smk->mclr_tbl[0] = 0; 298 smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1; 299 } else { 300 smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size); 301 } 302 if(!get_bits1(&gb)) { 303 av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n"); 304 smk->full_tbl = av_malloc(sizeof(int) * 2); 305 smk->full_tbl[0] = 0; 306 smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1; 307 } else { 308 smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size); 309 } 310 if(!get_bits1(&gb)) { 311 av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n"); 312 smk->type_tbl = av_malloc(sizeof(int) * 2); 313 smk->type_tbl[0] = 0; 314 smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1; 315 } else { 316 smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size); 317 } 318 319 return 0; 320} 321 322static av_always_inline void last_reset(int *recode, int *last) { 323 recode[last[0]] = recode[last[1]] = recode[last[2]] = 0; 324} 325 326/* get code and update history */ 327static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) { 328 register int *table = recode; 329 int v, b; 330 331 b = get_bits_count(gb); 332 while(*table & SMK_NODE) { 333 if(get_bits1(gb)) 334 table += (*table) & (~SMK_NODE); 335 table++; 336 } 337 v = *table; 338 b = get_bits_count(gb) - b; 339 340 if(v != recode[last[0]]) { 341 recode[last[2]] = recode[last[1]]; 342 recode[last[1]] = recode[last[0]]; 343 recode[last[0]] = v; 344 } 345 return v; 346} 347 348static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size) 349{ 350 SmackVContext * const smk = avctx->priv_data; 351 uint8_t *out; 352 uint32_t *pal; 353 GetBitContext gb; 354 int blocks, blk, bw, bh; 355 int i; 356 int stride; 357 358 if(buf_size <= 769) 359 return 0; 360 if(smk->pic.data[0]) 361 avctx->release_buffer(avctx, &smk->pic); 362 363 smk->pic.reference = 1; 364 smk->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; 365 if(avctx->reget_buffer(avctx, &smk->pic) < 0){ 366 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 367 return -1; 368 } 369 370 /* make the palette available on the way out */ 371 pal = (uint32_t*)smk->pic.data[1]; 372 smk->pic.palette_has_changed = buf[0] & 1; 373 smk->pic.key_frame = !!(buf[0] & 2); 374 if(smk->pic.key_frame) 375 smk->pic.pict_type = FF_I_TYPE; 376 else 377 smk->pic.pict_type = FF_P_TYPE; 378 379 buf++; 380 for(i = 0; i < 256; i++) 381 *pal++ = bytestream_get_be24(&buf); 382 buf_size -= 769; 383 384 last_reset(smk->mmap_tbl, smk->mmap_last); 385 last_reset(smk->mclr_tbl, smk->mclr_last); 386 last_reset(smk->full_tbl, smk->full_last); 387 last_reset(smk->type_tbl, smk->type_last); 388 init_get_bits(&gb, buf, buf_size * 8); 389 390 blk = 0; 391 bw = avctx->width >> 2; 392 bh = avctx->height >> 2; 393 blocks = bw * bh; 394 out = smk->pic.data[0]; 395 stride = smk->pic.linesize[0]; 396 while(blk < blocks) { 397 int type, run, mode; 398 uint16_t pix; 399 400 type = smk_get_code(&gb, smk->type_tbl, smk->type_last); 401 run = block_runs[(type >> 2) & 0x3F]; 402 switch(type & 3){ 403 case SMK_BLK_MONO: 404 while(run-- && blk < blocks){ 405 int clr, map; 406 int hi, lo; 407 clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last); 408 map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last); 409 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; 410 hi = clr >> 8; 411 lo = clr & 0xFF; 412 for(i = 0; i < 4; i++) { 413 if(map & 1) out[0] = hi; else out[0] = lo; 414 if(map & 2) out[1] = hi; else out[1] = lo; 415 if(map & 4) out[2] = hi; else out[2] = lo; 416 if(map & 8) out[3] = hi; else out[3] = lo; 417 map >>= 4; 418 out += stride; 419 } 420 blk++; 421 } 422 break; 423 case SMK_BLK_FULL: 424 mode = 0; 425 if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes 426 if(get_bits1(&gb)) mode = 1; 427 else if(get_bits1(&gb)) mode = 2; 428 } 429 while(run-- && blk < blocks){ 430 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; 431 switch(mode){ 432 case 0: 433 for(i = 0; i < 4; i++) { 434 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); 435 AV_WL16(out+2,pix); 436 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); 437 AV_WL16(out,pix); 438 out += stride; 439 } 440 break; 441 case 1: 442 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); 443 out[0] = out[1] = pix & 0xFF; 444 out[2] = out[3] = pix >> 8; 445 out += stride; 446 out[0] = out[1] = pix & 0xFF; 447 out[2] = out[3] = pix >> 8; 448 out += stride; 449 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); 450 out[0] = out[1] = pix & 0xFF; 451 out[2] = out[3] = pix >> 8; 452 out += stride; 453 out[0] = out[1] = pix & 0xFF; 454 out[2] = out[3] = pix >> 8; 455 out += stride; 456 break; 457 case 2: 458 for(i = 0; i < 2; i++) { 459 uint16_t pix1, pix2; 460 pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last); 461 pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last); 462 AV_WL16(out,pix1); 463 AV_WL16(out+2,pix2); 464 out += stride; 465 AV_WL16(out,pix1); 466 AV_WL16(out+2,pix2); 467 out += stride; 468 } 469 break; 470 } 471 blk++; 472 } 473 break; 474 case SMK_BLK_SKIP: 475 while(run-- && blk < blocks) 476 blk++; 477 break; 478 case SMK_BLK_FILL: 479 mode = type >> 8; 480 while(run-- && blk < blocks){ 481 uint32_t col; 482 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; 483 col = mode * 0x01010101; 484 for(i = 0; i < 4; i++) { 485 *((uint32_t*)out) = col; 486 out += stride; 487 } 488 blk++; 489 } 490 break; 491 } 492 493 } 494 495 *data_size = sizeof(AVFrame); 496 *(AVFrame*)data = smk->pic; 497 498 /* always report that the buffer was completely consumed */ 499 return buf_size; 500} 501 502 503 504/* 505 * 506 * Init smacker decoder 507 * 508 */ 509static av_cold int decode_init(AVCodecContext *avctx) 510{ 511 SmackVContext * const c = avctx->priv_data; 512 513 c->avctx = avctx; 514 515 c->pic.data[0] = NULL; 516 517 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) { 518 return 1; 519 } 520 521 avctx->pix_fmt = PIX_FMT_PAL8; 522 523 524 /* decode huffman trees from extradata */ 525 if(avctx->extradata_size < 16){ 526 av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n"); 527 return -1; 528 } 529 530 decode_header_trees(c); 531 532 533 return 0; 534} 535 536 537 538/* 539 * 540 * Uninit smacker decoder 541 * 542 */ 543static av_cold int decode_end(AVCodecContext *avctx) 544{ 545 SmackVContext * const smk = avctx->priv_data; 546 547 av_freep(&smk->mmap_tbl); 548 av_freep(&smk->mclr_tbl); 549 av_freep(&smk->full_tbl); 550 av_freep(&smk->type_tbl); 551 552 if (smk->pic.data[0]) 553 avctx->release_buffer(avctx, &smk->pic); 554 555 return 0; 556} 557 558 559static av_cold int smka_decode_init(AVCodecContext *avctx) 560{ 561 avctx->sample_fmt = SAMPLE_FMT_S16; 562 avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO; 563 return 0; 564} 565 566/** 567 * Decode Smacker audio data 568 */ 569static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size) 570{ 571 GetBitContext gb; 572 HuffContext h[4]; 573 VLC vlc[4]; 574 int16_t *samples = data; 575 int val; 576 int i, res; 577 int unp_size; 578 int bits, stereo; 579 int pred[2] = {0, 0}; 580 581 unp_size = AV_RL32(buf); 582 583 init_get_bits(&gb, buf + 4, (buf_size - 4) * 8); 584 585 if(!get_bits1(&gb)){ 586 av_log(avctx, AV_LOG_INFO, "Sound: no data\n"); 587 *data_size = 0; 588 return 1; 589 } 590 stereo = get_bits1(&gb); 591 bits = get_bits1(&gb); 592 if (unp_size & 0xC0000000 || (unp_size << !bits) > *data_size) { 593 av_log(avctx, AV_LOG_ERROR, "Frame is too large to fit in buffer\n"); 594 return -1; 595 } 596 597 memset(vlc, 0, sizeof(VLC) * 4); 598 memset(h, 0, sizeof(HuffContext) * 4); 599 // Initialize 600 for(i = 0; i < (1 << (bits + stereo)); i++) { 601 h[i].length = 256; 602 h[i].maxlength = 0; 603 h[i].current = 0; 604 h[i].bits = av_mallocz(256 * 4); 605 h[i].lengths = av_mallocz(256 * sizeof(int)); 606 h[i].values = av_mallocz(256 * sizeof(int)); 607 skip_bits1(&gb); 608 smacker_decode_tree(&gb, &h[i], 0, 0); 609 skip_bits1(&gb); 610 if(h[i].current > 1) { 611 res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length, 612 h[i].lengths, sizeof(int), sizeof(int), 613 h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE); 614 if(res < 0) { 615 av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n"); 616 return -1; 617 } 618 } 619 } 620 if(bits) { //decode 16-bit data 621 for(i = stereo; i >= 0; i--) 622 pred[i] = bswap_16(get_bits(&gb, 16)); 623 for(i = 0; i < stereo; i++) 624 *samples++ = pred[i]; 625 for(i = 0; i < unp_size / 2; i++) { 626 if(i & stereo) { 627 if(vlc[2].table) 628 res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3); 629 else 630 res = 0; 631 val = h[2].values[res]; 632 if(vlc[3].table) 633 res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3); 634 else 635 res = 0; 636 val |= h[3].values[res] << 8; 637 pred[1] += (int16_t)val; 638 *samples++ = pred[1]; 639 } else { 640 if(vlc[0].table) 641 res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); 642 else 643 res = 0; 644 val = h[0].values[res]; 645 if(vlc[1].table) 646 res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); 647 else 648 res = 0; 649 val |= h[1].values[res] << 8; 650 pred[0] += val; 651 *samples++ = pred[0]; 652 } 653 } 654 } else { //8-bit data 655 for(i = stereo; i >= 0; i--) 656 pred[i] = get_bits(&gb, 8); 657 for(i = 0; i < stereo; i++) 658 *samples++ = (pred[i] - 0x80) << 8; 659 for(i = 0; i < unp_size; i++) { 660 if(i & stereo){ 661 if(vlc[1].table) 662 res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); 663 else 664 res = 0; 665 pred[1] += (int8_t)h[1].values[res]; 666 *samples++ = (pred[1] - 0x80) << 8; 667 } else { 668 if(vlc[0].table) 669 res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); 670 else 671 res = 0; 672 pred[0] += (int8_t)h[0].values[res]; 673 *samples++ = (pred[0] - 0x80) << 8; 674 } 675 } 676 unp_size *= 2; 677 } 678 679 for(i = 0; i < 4; i++) { 680 if(vlc[i].table) 681 free_vlc(&vlc[i]); 682 if(h[i].bits) 683 av_free(h[i].bits); 684 if(h[i].lengths) 685 av_free(h[i].lengths); 686 if(h[i].values) 687 av_free(h[i].values); 688 } 689 690 *data_size = unp_size; 691 return buf_size; 692} 693 694AVCodec smacker_decoder = { 695 "smackvid", 696 CODEC_TYPE_VIDEO, 697 CODEC_ID_SMACKVIDEO, 698 sizeof(SmackVContext), 699 decode_init, 700 NULL, 701 decode_end, 702 decode_frame, 703 .long_name = NULL_IF_CONFIG_SMALL("Smacker video"), 704}; 705 706AVCodec smackaud_decoder = { 707 "smackaud", 708 CODEC_TYPE_AUDIO, 709 CODEC_ID_SMACKAUDIO, 710 0, 711 smka_decode_init, 712 NULL, 713 NULL, 714 smka_decode_frame, 715 .long_name = NULL_IF_CONFIG_SMALL("Smacker audio"), 716}; 717 718