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 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 "get_bits.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, AVPacket *avpkt) 349{ 350 const uint8_t *buf = avpkt->data; 351 int buf_size = avpkt->size; 352 SmackVContext * const smk = avctx->priv_data; 353 uint8_t *out; 354 uint32_t *pal; 355 GetBitContext gb; 356 int blocks, blk, bw, bh; 357 int i; 358 int stride; 359 360 if(buf_size <= 769) 361 return 0; 362 if(smk->pic.data[0]) 363 avctx->release_buffer(avctx, &smk->pic); 364 365 smk->pic.reference = 1; 366 smk->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; 367 if(avctx->reget_buffer(avctx, &smk->pic) < 0){ 368 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 369 return -1; 370 } 371 372 /* make the palette available on the way out */ 373 pal = (uint32_t*)smk->pic.data[1]; 374 smk->pic.palette_has_changed = buf[0] & 1; 375 smk->pic.key_frame = !!(buf[0] & 2); 376 if(smk->pic.key_frame) 377 smk->pic.pict_type = FF_I_TYPE; 378 else 379 smk->pic.pict_type = FF_P_TYPE; 380 381 buf++; 382 for(i = 0; i < 256; i++) 383 *pal++ = bytestream_get_be24(&buf); 384 buf_size -= 769; 385 386 last_reset(smk->mmap_tbl, smk->mmap_last); 387 last_reset(smk->mclr_tbl, smk->mclr_last); 388 last_reset(smk->full_tbl, smk->full_last); 389 last_reset(smk->type_tbl, smk->type_last); 390 init_get_bits(&gb, buf, buf_size * 8); 391 392 blk = 0; 393 bw = avctx->width >> 2; 394 bh = avctx->height >> 2; 395 blocks = bw * bh; 396 out = smk->pic.data[0]; 397 stride = smk->pic.linesize[0]; 398 while(blk < blocks) { 399 int type, run, mode; 400 uint16_t pix; 401 402 type = smk_get_code(&gb, smk->type_tbl, smk->type_last); 403 run = block_runs[(type >> 2) & 0x3F]; 404 switch(type & 3){ 405 case SMK_BLK_MONO: 406 while(run-- && blk < blocks){ 407 int clr, map; 408 int hi, lo; 409 clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last); 410 map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last); 411 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; 412 hi = clr >> 8; 413 lo = clr & 0xFF; 414 for(i = 0; i < 4; i++) { 415 if(map & 1) out[0] = hi; else out[0] = lo; 416 if(map & 2) out[1] = hi; else out[1] = lo; 417 if(map & 4) out[2] = hi; else out[2] = lo; 418 if(map & 8) out[3] = hi; else out[3] = lo; 419 map >>= 4; 420 out += stride; 421 } 422 blk++; 423 } 424 break; 425 case SMK_BLK_FULL: 426 mode = 0; 427 if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes 428 if(get_bits1(&gb)) mode = 1; 429 else if(get_bits1(&gb)) mode = 2; 430 } 431 while(run-- && blk < blocks){ 432 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; 433 switch(mode){ 434 case 0: 435 for(i = 0; i < 4; i++) { 436 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); 437 AV_WL16(out+2,pix); 438 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); 439 AV_WL16(out,pix); 440 out += stride; 441 } 442 break; 443 case 1: 444 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); 445 out[0] = out[1] = pix & 0xFF; 446 out[2] = out[3] = pix >> 8; 447 out += stride; 448 out[0] = out[1] = pix & 0xFF; 449 out[2] = out[3] = pix >> 8; 450 out += stride; 451 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); 452 out[0] = out[1] = pix & 0xFF; 453 out[2] = out[3] = pix >> 8; 454 out += stride; 455 out[0] = out[1] = pix & 0xFF; 456 out[2] = out[3] = pix >> 8; 457 out += stride; 458 break; 459 case 2: 460 for(i = 0; i < 2; i++) { 461 uint16_t pix1, pix2; 462 pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last); 463 pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last); 464 AV_WL16(out,pix1); 465 AV_WL16(out+2,pix2); 466 out += stride; 467 AV_WL16(out,pix1); 468 AV_WL16(out+2,pix2); 469 out += stride; 470 } 471 break; 472 } 473 blk++; 474 } 475 break; 476 case SMK_BLK_SKIP: 477 while(run-- && blk < blocks) 478 blk++; 479 break; 480 case SMK_BLK_FILL: 481 mode = type >> 8; 482 while(run-- && blk < blocks){ 483 uint32_t col; 484 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; 485 col = mode * 0x01010101; 486 for(i = 0; i < 4; i++) { 487 *((uint32_t*)out) = col; 488 out += stride; 489 } 490 blk++; 491 } 492 break; 493 } 494 495 } 496 497 *data_size = sizeof(AVFrame); 498 *(AVFrame*)data = smk->pic; 499 500 /* always report that the buffer was completely consumed */ 501 return buf_size; 502} 503 504 505 506/* 507 * 508 * Init smacker decoder 509 * 510 */ 511static av_cold int decode_init(AVCodecContext *avctx) 512{ 513 SmackVContext * const c = avctx->priv_data; 514 515 c->avctx = avctx; 516 517 avctx->pix_fmt = PIX_FMT_PAL8; 518 519 520 /* decode huffman trees from extradata */ 521 if(avctx->extradata_size < 16){ 522 av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n"); 523 return -1; 524 } 525 526 decode_header_trees(c); 527 528 529 return 0; 530} 531 532 533 534/* 535 * 536 * Uninit smacker decoder 537 * 538 */ 539static av_cold int decode_end(AVCodecContext *avctx) 540{ 541 SmackVContext * const smk = avctx->priv_data; 542 543 av_freep(&smk->mmap_tbl); 544 av_freep(&smk->mclr_tbl); 545 av_freep(&smk->full_tbl); 546 av_freep(&smk->type_tbl); 547 548 if (smk->pic.data[0]) 549 avctx->release_buffer(avctx, &smk->pic); 550 551 return 0; 552} 553 554 555static av_cold int smka_decode_init(AVCodecContext *avctx) 556{ 557 avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO; 558 avctx->sample_fmt = avctx->bits_per_coded_sample == 8 ? SAMPLE_FMT_U8 : SAMPLE_FMT_S16; 559 return 0; 560} 561 562/** 563 * Decode Smacker audio data 564 */ 565static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) 566{ 567 const uint8_t *buf = avpkt->data; 568 int buf_size = avpkt->size; 569 GetBitContext gb; 570 HuffContext h[4]; 571 VLC vlc[4]; 572 int16_t *samples = data; 573 int8_t *samples8 = data; 574 int val; 575 int i, res; 576 int unp_size; 577 int bits, stereo; 578 int pred[2] = {0, 0}; 579 580 unp_size = AV_RL32(buf); 581 582 init_get_bits(&gb, buf + 4, (buf_size - 4) * 8); 583 584 if(!get_bits1(&gb)){ 585 av_log(avctx, AV_LOG_INFO, "Sound: no data\n"); 586 *data_size = 0; 587 return 1; 588 } 589 stereo = get_bits1(&gb); 590 bits = get_bits1(&gb); 591 if (unp_size & 0xC0000000 || unp_size > *data_size) { 592 av_log(avctx, AV_LOG_ERROR, "Frame is too large to fit in buffer\n"); 593 return -1; 594 } 595 596 memset(vlc, 0, sizeof(VLC) * 4); 597 memset(h, 0, sizeof(HuffContext) * 4); 598 // Initialize 599 for(i = 0; i < (1 << (bits + stereo)); i++) { 600 h[i].length = 256; 601 h[i].maxlength = 0; 602 h[i].current = 0; 603 h[i].bits = av_mallocz(256 * 4); 604 h[i].lengths = av_mallocz(256 * sizeof(int)); 605 h[i].values = av_mallocz(256 * sizeof(int)); 606 skip_bits1(&gb); 607 smacker_decode_tree(&gb, &h[i], 0, 0); 608 skip_bits1(&gb); 609 if(h[i].current > 1) { 610 res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length, 611 h[i].lengths, sizeof(int), sizeof(int), 612 h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE); 613 if(res < 0) { 614 av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n"); 615 return -1; 616 } 617 } 618 } 619 if(bits) { //decode 16-bit data 620 for(i = stereo; i >= 0; i--) 621 pred[i] = bswap_16(get_bits(&gb, 16)); 622 for(i = 0; i < stereo; i++) 623 *samples++ = pred[i]; 624 for(i = 0; i < unp_size / 2; i++) { 625 if(i & stereo) { 626 if(vlc[2].table) 627 res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3); 628 else 629 res = 0; 630 val = h[2].values[res]; 631 if(vlc[3].table) 632 res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3); 633 else 634 res = 0; 635 val |= h[3].values[res] << 8; 636 pred[1] += (int16_t)val; 637 *samples++ = pred[1]; 638 } else { 639 if(vlc[0].table) 640 res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); 641 else 642 res = 0; 643 val = h[0].values[res]; 644 if(vlc[1].table) 645 res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); 646 else 647 res = 0; 648 val |= h[1].values[res] << 8; 649 pred[0] += val; 650 *samples++ = pred[0]; 651 } 652 } 653 } else { //8-bit data 654 for(i = stereo; i >= 0; i--) 655 pred[i] = get_bits(&gb, 8); 656 for(i = 0; i < stereo; i++) 657 *samples8++ = pred[i]; 658 for(i = 0; i < unp_size; i++) { 659 if(i & stereo){ 660 if(vlc[1].table) 661 res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); 662 else 663 res = 0; 664 pred[1] += (int8_t)h[1].values[res]; 665 *samples8++ = pred[1]; 666 } else { 667 if(vlc[0].table) 668 res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); 669 else 670 res = 0; 671 pred[0] += (int8_t)h[0].values[res]; 672 *samples8++ = pred[0]; 673 } 674 } 675 } 676 677 for(i = 0; i < 4; i++) { 678 if(vlc[i].table) 679 free_vlc(&vlc[i]); 680 if(h[i].bits) 681 av_free(h[i].bits); 682 if(h[i].lengths) 683 av_free(h[i].lengths); 684 if(h[i].values) 685 av_free(h[i].values); 686 } 687 688 *data_size = unp_size; 689 return buf_size; 690} 691 692AVCodec smacker_decoder = { 693 "smackvid", 694 AVMEDIA_TYPE_VIDEO, 695 CODEC_ID_SMACKVIDEO, 696 sizeof(SmackVContext), 697 decode_init, 698 NULL, 699 decode_end, 700 decode_frame, 701 CODEC_CAP_DR1, 702 .long_name = NULL_IF_CONFIG_SMALL("Smacker video"), 703}; 704 705AVCodec smackaud_decoder = { 706 "smackaud", 707 AVMEDIA_TYPE_AUDIO, 708 CODEC_ID_SMACKAUDIO, 709 0, 710 smka_decode_init, 711 NULL, 712 NULL, 713 smka_decode_frame, 714 .long_name = NULL_IF_CONFIG_SMALL("Smacker audio"), 715}; 716 717