| 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 "libavutil/channel_layout.h" |
| 35 | #include "avcodec.h" |
| 36 | #include "internal.h" |
| 37 | #include "mathops.h" |
| 38 | |
| 39 | #define BITSTREAM_READER_LE |
| 40 | #include "get_bits.h" |
| 41 | #include "bytestream.h" |
| 42 | |
| 43 | #define SMKTREE_BITS 9 |
| 44 | #define SMK_NODE 0x80000000 |
| 45 | |
| 46 | /* |
| 47 | * Decoder context |
| 48 | */ |
| 49 | typedef struct SmackVContext { |
| 50 | AVCodecContext *avctx; |
| 51 | AVFrame *pic; |
| 52 | |
| 53 | int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl; |
| 54 | int mmap_last[3], mclr_last[3], full_last[3], type_last[3]; |
| 55 | } SmackVContext; |
| 56 | |
| 57 | /** |
| 58 | * Context used for code reconstructing |
| 59 | */ |
| 60 | typedef struct HuffContext { |
| 61 | int length; |
| 62 | int maxlength; |
| 63 | int current; |
| 64 | uint32_t *bits; |
| 65 | int *lengths; |
| 66 | int *values; |
| 67 | } HuffContext; |
| 68 | |
| 69 | /* common parameters used for decode_bigtree */ |
| 70 | typedef struct DBCtx { |
| 71 | VLC *v1, *v2; |
| 72 | int *recode1, *recode2; |
| 73 | int escapes[3]; |
| 74 | int *last; |
| 75 | int lcur; |
| 76 | } DBCtx; |
| 77 | |
| 78 | /* possible runs of blocks */ |
| 79 | static const int block_runs[64] = { |
| 80 | 1, 2, 3, 4, 5, 6, 7, 8, |
| 81 | 9, 10, 11, 12, 13, 14, 15, 16, |
| 82 | 17, 18, 19, 20, 21, 22, 23, 24, |
| 83 | 25, 26, 27, 28, 29, 30, 31, 32, |
| 84 | 33, 34, 35, 36, 37, 38, 39, 40, |
| 85 | 41, 42, 43, 44, 45, 46, 47, 48, |
| 86 | 49, 50, 51, 52, 53, 54, 55, 56, |
| 87 | 57, 58, 59, 128, 256, 512, 1024, 2048 }; |
| 88 | |
| 89 | enum SmkBlockTypes { |
| 90 | SMK_BLK_MONO = 0, |
| 91 | SMK_BLK_FULL = 1, |
| 92 | SMK_BLK_SKIP = 2, |
| 93 | SMK_BLK_FILL = 3 }; |
| 94 | |
| 95 | /** |
| 96 | * Decode local frame tree |
| 97 | */ |
| 98 | static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length) |
| 99 | { |
| 100 | if(length > 32 || length > 3*SMKTREE_BITS) { |
| 101 | av_log(NULL, AV_LOG_ERROR, "length too long\n"); |
| 102 | return AVERROR_INVALIDDATA; |
| 103 | } |
| 104 | if(!get_bits1(gb)){ //Leaf |
| 105 | if(hc->current >= hc->length){ |
| 106 | av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n"); |
| 107 | return AVERROR_INVALIDDATA; |
| 108 | } |
| 109 | if(length){ |
| 110 | hc->bits[hc->current] = prefix; |
| 111 | hc->lengths[hc->current] = length; |
| 112 | } else { |
| 113 | hc->bits[hc->current] = 0; |
| 114 | hc->lengths[hc->current] = 0; |
| 115 | } |
| 116 | hc->values[hc->current] = get_bits(gb, 8); |
| 117 | hc->current++; |
| 118 | if(hc->maxlength < length) |
| 119 | hc->maxlength = length; |
| 120 | return 0; |
| 121 | } else { //Node |
| 122 | int r; |
| 123 | length++; |
| 124 | r = smacker_decode_tree(gb, hc, prefix, length); |
| 125 | if(r) |
| 126 | return r; |
| 127 | return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length); |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Decode header tree |
| 133 | */ |
| 134 | static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx) |
| 135 | { |
| 136 | if (hc->current + 1 >= hc->length) { |
| 137 | av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n"); |
| 138 | return AVERROR_INVALIDDATA; |
| 139 | } |
| 140 | if(!get_bits1(gb)){ //Leaf |
| 141 | int val, i1, i2; |
| 142 | i1 = ctx->v1->table ? get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3) : 0; |
| 143 | i2 = ctx->v2->table ? get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3) : 0; |
| 144 | if (i1 < 0 || i2 < 0) |
| 145 | return AVERROR_INVALIDDATA; |
| 146 | val = ctx->recode1[i1] | (ctx->recode2[i2] << 8); |
| 147 | if(val == ctx->escapes[0]) { |
| 148 | ctx->last[0] = hc->current; |
| 149 | val = 0; |
| 150 | } else if(val == ctx->escapes[1]) { |
| 151 | ctx->last[1] = hc->current; |
| 152 | val = 0; |
| 153 | } else if(val == ctx->escapes[2]) { |
| 154 | ctx->last[2] = hc->current; |
| 155 | val = 0; |
| 156 | } |
| 157 | |
| 158 | hc->values[hc->current++] = val; |
| 159 | return 1; |
| 160 | } else { //Node |
| 161 | int r = 0, r_new, t; |
| 162 | |
| 163 | t = hc->current++; |
| 164 | r = smacker_decode_bigtree(gb, hc, ctx); |
| 165 | if(r < 0) |
| 166 | return r; |
| 167 | hc->values[t] = SMK_NODE | r; |
| 168 | r++; |
| 169 | r_new = smacker_decode_bigtree(gb, hc, ctx); |
| 170 | if (r_new < 0) |
| 171 | return r_new; |
| 172 | return r + r_new; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Store large tree as FFmpeg's vlc codes |
| 178 | */ |
| 179 | static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size) |
| 180 | { |
| 181 | int res; |
| 182 | HuffContext huff; |
| 183 | HuffContext tmp1, tmp2; |
| 184 | VLC vlc[2] = { { 0 } }; |
| 185 | int escapes[3]; |
| 186 | DBCtx ctx; |
| 187 | int err = 0; |
| 188 | |
| 189 | if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow |
| 190 | av_log(smk->avctx, AV_LOG_ERROR, "size too large\n"); |
| 191 | return AVERROR_INVALIDDATA; |
| 192 | } |
| 193 | |
| 194 | tmp1.length = 256; |
| 195 | tmp1.maxlength = 0; |
| 196 | tmp1.current = 0; |
| 197 | tmp1.bits = av_mallocz(256 * 4); |
| 198 | tmp1.lengths = av_mallocz(256 * sizeof(int)); |
| 199 | tmp1.values = av_mallocz(256 * sizeof(int)); |
| 200 | |
| 201 | tmp2.length = 256; |
| 202 | tmp2.maxlength = 0; |
| 203 | tmp2.current = 0; |
| 204 | tmp2.bits = av_mallocz(256 * 4); |
| 205 | tmp2.lengths = av_mallocz(256 * sizeof(int)); |
| 206 | tmp2.values = av_mallocz(256 * sizeof(int)); |
| 207 | if (!tmp1.bits || !tmp1.lengths || !tmp1.values || |
| 208 | !tmp2.bits || !tmp2.lengths || !tmp2.values) { |
| 209 | err = AVERROR(ENOMEM); |
| 210 | goto error; |
| 211 | } |
| 212 | |
| 213 | if(get_bits1(gb)) { |
| 214 | res = smacker_decode_tree(gb, &tmp1, 0, 0); |
| 215 | if (res < 0) { |
| 216 | err = res; |
| 217 | goto error; |
| 218 | } |
| 219 | skip_bits1(gb); |
| 220 | if(tmp1.current > 1) { |
| 221 | res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length, |
| 222 | tmp1.lengths, sizeof(int), sizeof(int), |
| 223 | tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE); |
| 224 | if(res < 0) { |
| 225 | av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n"); |
| 226 | err = res; |
| 227 | goto error; |
| 228 | } |
| 229 | } |
| 230 | } |
| 231 | if (!vlc[0].table) { |
| 232 | av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n"); |
| 233 | } |
| 234 | if(get_bits1(gb)){ |
| 235 | res = smacker_decode_tree(gb, &tmp2, 0, 0); |
| 236 | if (res < 0) { |
| 237 | err = res; |
| 238 | goto error; |
| 239 | } |
| 240 | skip_bits1(gb); |
| 241 | if(tmp2.current > 1) { |
| 242 | res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length, |
| 243 | tmp2.lengths, sizeof(int), sizeof(int), |
| 244 | tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE); |
| 245 | if(res < 0) { |
| 246 | av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n"); |
| 247 | err = res; |
| 248 | goto error; |
| 249 | } |
| 250 | } |
| 251 | } |
| 252 | if (!vlc[1].table) { |
| 253 | av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n"); |
| 254 | } |
| 255 | |
| 256 | escapes[0] = get_bits(gb, 16); |
| 257 | escapes[1] = get_bits(gb, 16); |
| 258 | escapes[2] = get_bits(gb, 16); |
| 259 | |
| 260 | last[0] = last[1] = last[2] = -1; |
| 261 | |
| 262 | ctx.escapes[0] = escapes[0]; |
| 263 | ctx.escapes[1] = escapes[1]; |
| 264 | ctx.escapes[2] = escapes[2]; |
| 265 | ctx.v1 = &vlc[0]; |
| 266 | ctx.v2 = &vlc[1]; |
| 267 | ctx.recode1 = tmp1.values; |
| 268 | ctx.recode2 = tmp2.values; |
| 269 | ctx.last = last; |
| 270 | |
| 271 | huff.length = ((size + 3) >> 2) + 4; |
| 272 | huff.maxlength = 0; |
| 273 | huff.current = 0; |
| 274 | huff.values = av_mallocz_array(huff.length, sizeof(int)); |
| 275 | if (!huff.values) { |
| 276 | err = AVERROR(ENOMEM); |
| 277 | goto error; |
| 278 | } |
| 279 | |
| 280 | if (smacker_decode_bigtree(gb, &huff, &ctx) < 0) |
| 281 | err = -1; |
| 282 | skip_bits1(gb); |
| 283 | if(ctx.last[0] == -1) ctx.last[0] = huff.current++; |
| 284 | if(ctx.last[1] == -1) ctx.last[1] = huff.current++; |
| 285 | if(ctx.last[2] == -1) ctx.last[2] = huff.current++; |
| 286 | if (ctx.last[0] >= huff.length || |
| 287 | ctx.last[1] >= huff.length || |
| 288 | ctx.last[2] >= huff.length) { |
| 289 | av_log(smk->avctx, AV_LOG_ERROR, "Huffman codes out of range\n"); |
| 290 | err = AVERROR_INVALIDDATA; |
| 291 | } |
| 292 | |
| 293 | *recodes = huff.values; |
| 294 | |
| 295 | error: |
| 296 | if(vlc[0].table) |
| 297 | ff_free_vlc(&vlc[0]); |
| 298 | if(vlc[1].table) |
| 299 | ff_free_vlc(&vlc[1]); |
| 300 | av_free(tmp1.bits); |
| 301 | av_free(tmp1.lengths); |
| 302 | av_free(tmp1.values); |
| 303 | av_free(tmp2.bits); |
| 304 | av_free(tmp2.lengths); |
| 305 | av_free(tmp2.values); |
| 306 | |
| 307 | return err; |
| 308 | } |
| 309 | |
| 310 | static int decode_header_trees(SmackVContext *smk) { |
| 311 | GetBitContext gb; |
| 312 | int mmap_size, mclr_size, full_size, type_size, ret; |
| 313 | |
| 314 | mmap_size = AV_RL32(smk->avctx->extradata); |
| 315 | mclr_size = AV_RL32(smk->avctx->extradata + 4); |
| 316 | full_size = AV_RL32(smk->avctx->extradata + 8); |
| 317 | type_size = AV_RL32(smk->avctx->extradata + 12); |
| 318 | |
| 319 | init_get_bits8(&gb, smk->avctx->extradata + 16, smk->avctx->extradata_size - 16); |
| 320 | |
| 321 | if(!get_bits1(&gb)) { |
| 322 | av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n"); |
| 323 | smk->mmap_tbl = av_malloc(sizeof(int) * 2); |
| 324 | if (!smk->mmap_tbl) |
| 325 | return AVERROR(ENOMEM); |
| 326 | smk->mmap_tbl[0] = 0; |
| 327 | smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1; |
| 328 | } else { |
| 329 | ret = smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size); |
| 330 | if (ret < 0) |
| 331 | return ret; |
| 332 | } |
| 333 | if(!get_bits1(&gb)) { |
| 334 | av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n"); |
| 335 | smk->mclr_tbl = av_malloc(sizeof(int) * 2); |
| 336 | if (!smk->mclr_tbl) |
| 337 | return AVERROR(ENOMEM); |
| 338 | smk->mclr_tbl[0] = 0; |
| 339 | smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1; |
| 340 | } else { |
| 341 | ret = smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size); |
| 342 | if (ret < 0) |
| 343 | return ret; |
| 344 | } |
| 345 | if(!get_bits1(&gb)) { |
| 346 | av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n"); |
| 347 | smk->full_tbl = av_malloc(sizeof(int) * 2); |
| 348 | if (!smk->full_tbl) |
| 349 | return AVERROR(ENOMEM); |
| 350 | smk->full_tbl[0] = 0; |
| 351 | smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1; |
| 352 | } else { |
| 353 | ret = smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size); |
| 354 | if (ret < 0) |
| 355 | return ret; |
| 356 | } |
| 357 | if(!get_bits1(&gb)) { |
| 358 | av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n"); |
| 359 | smk->type_tbl = av_malloc(sizeof(int) * 2); |
| 360 | if (!smk->type_tbl) |
| 361 | return AVERROR(ENOMEM); |
| 362 | smk->type_tbl[0] = 0; |
| 363 | smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1; |
| 364 | } else { |
| 365 | ret = smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size); |
| 366 | if (ret < 0) |
| 367 | return ret; |
| 368 | } |
| 369 | |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | static av_always_inline void last_reset(int *recode, int *last) { |
| 374 | recode[last[0]] = recode[last[1]] = recode[last[2]] = 0; |
| 375 | } |
| 376 | |
| 377 | /* get code and update history */ |
| 378 | static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) { |
| 379 | register int *table = recode; |
| 380 | int v; |
| 381 | |
| 382 | while(*table & SMK_NODE) { |
| 383 | if(get_bits1(gb)) |
| 384 | table += (*table) & (~SMK_NODE); |
| 385 | table++; |
| 386 | } |
| 387 | v = *table; |
| 388 | |
| 389 | if(v != recode[last[0]]) { |
| 390 | recode[last[2]] = recode[last[1]]; |
| 391 | recode[last[1]] = recode[last[0]]; |
| 392 | recode[last[0]] = v; |
| 393 | } |
| 394 | return v; |
| 395 | } |
| 396 | |
| 397 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| 398 | AVPacket *avpkt) |
| 399 | { |
| 400 | SmackVContext * const smk = avctx->priv_data; |
| 401 | uint8_t *out; |
| 402 | uint32_t *pal; |
| 403 | GetByteContext gb2; |
| 404 | GetBitContext gb; |
| 405 | int blocks, blk, bw, bh; |
| 406 | int i, ret; |
| 407 | int stride; |
| 408 | int flags; |
| 409 | |
| 410 | if (avpkt->size <= 769) |
| 411 | return AVERROR_INVALIDDATA; |
| 412 | |
| 413 | if ((ret = ff_reget_buffer(avctx, smk->pic)) < 0) |
| 414 | return ret; |
| 415 | |
| 416 | /* make the palette available on the way out */ |
| 417 | pal = (uint32_t*)smk->pic->data[1]; |
| 418 | bytestream2_init(&gb2, avpkt->data, avpkt->size); |
| 419 | flags = bytestream2_get_byteu(&gb2); |
| 420 | smk->pic->palette_has_changed = flags & 1; |
| 421 | smk->pic->key_frame = !!(flags & 2); |
| 422 | if (smk->pic->key_frame) |
| 423 | smk->pic->pict_type = AV_PICTURE_TYPE_I; |
| 424 | else |
| 425 | smk->pic->pict_type = AV_PICTURE_TYPE_P; |
| 426 | |
| 427 | for(i = 0; i < 256; i++) |
| 428 | *pal++ = 0xFFU << 24 | bytestream2_get_be24u(&gb2); |
| 429 | |
| 430 | last_reset(smk->mmap_tbl, smk->mmap_last); |
| 431 | last_reset(smk->mclr_tbl, smk->mclr_last); |
| 432 | last_reset(smk->full_tbl, smk->full_last); |
| 433 | last_reset(smk->type_tbl, smk->type_last); |
| 434 | if ((ret = init_get_bits8(&gb, avpkt->data + 769, avpkt->size - 769)) < 0) |
| 435 | return ret; |
| 436 | |
| 437 | blk = 0; |
| 438 | bw = avctx->width >> 2; |
| 439 | bh = avctx->height >> 2; |
| 440 | blocks = bw * bh; |
| 441 | stride = smk->pic->linesize[0]; |
| 442 | while(blk < blocks) { |
| 443 | int type, run, mode; |
| 444 | uint16_t pix; |
| 445 | |
| 446 | type = smk_get_code(&gb, smk->type_tbl, smk->type_last); |
| 447 | run = block_runs[(type >> 2) & 0x3F]; |
| 448 | switch(type & 3){ |
| 449 | case SMK_BLK_MONO: |
| 450 | while(run-- && blk < blocks){ |
| 451 | int clr, map; |
| 452 | int hi, lo; |
| 453 | clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last); |
| 454 | map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last); |
| 455 | out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; |
| 456 | hi = clr >> 8; |
| 457 | lo = clr & 0xFF; |
| 458 | for(i = 0; i < 4; i++) { |
| 459 | if(map & 1) out[0] = hi; else out[0] = lo; |
| 460 | if(map & 2) out[1] = hi; else out[1] = lo; |
| 461 | if(map & 4) out[2] = hi; else out[2] = lo; |
| 462 | if(map & 8) out[3] = hi; else out[3] = lo; |
| 463 | map >>= 4; |
| 464 | out += stride; |
| 465 | } |
| 466 | blk++; |
| 467 | } |
| 468 | break; |
| 469 | case SMK_BLK_FULL: |
| 470 | mode = 0; |
| 471 | if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes |
| 472 | if(get_bits1(&gb)) mode = 1; |
| 473 | else if(get_bits1(&gb)) mode = 2; |
| 474 | } |
| 475 | while(run-- && blk < blocks){ |
| 476 | out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; |
| 477 | switch(mode){ |
| 478 | case 0: |
| 479 | for(i = 0; i < 4; i++) { |
| 480 | pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); |
| 481 | AV_WL16(out+2,pix); |
| 482 | pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); |
| 483 | AV_WL16(out,pix); |
| 484 | out += stride; |
| 485 | } |
| 486 | break; |
| 487 | case 1: |
| 488 | pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); |
| 489 | out[0] = out[1] = pix & 0xFF; |
| 490 | out[2] = out[3] = pix >> 8; |
| 491 | out += stride; |
| 492 | out[0] = out[1] = pix & 0xFF; |
| 493 | out[2] = out[3] = pix >> 8; |
| 494 | out += stride; |
| 495 | pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); |
| 496 | out[0] = out[1] = pix & 0xFF; |
| 497 | out[2] = out[3] = pix >> 8; |
| 498 | out += stride; |
| 499 | out[0] = out[1] = pix & 0xFF; |
| 500 | out[2] = out[3] = pix >> 8; |
| 501 | break; |
| 502 | case 2: |
| 503 | for(i = 0; i < 2; i++) { |
| 504 | uint16_t pix1, pix2; |
| 505 | pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last); |
| 506 | pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last); |
| 507 | AV_WL16(out,pix1); |
| 508 | AV_WL16(out+2,pix2); |
| 509 | out += stride; |
| 510 | AV_WL16(out,pix1); |
| 511 | AV_WL16(out+2,pix2); |
| 512 | out += stride; |
| 513 | } |
| 514 | break; |
| 515 | } |
| 516 | blk++; |
| 517 | } |
| 518 | break; |
| 519 | case SMK_BLK_SKIP: |
| 520 | while(run-- && blk < blocks) |
| 521 | blk++; |
| 522 | break; |
| 523 | case SMK_BLK_FILL: |
| 524 | mode = type >> 8; |
| 525 | while(run-- && blk < blocks){ |
| 526 | uint32_t col; |
| 527 | out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; |
| 528 | col = mode * 0x01010101; |
| 529 | for(i = 0; i < 4; i++) { |
| 530 | *((uint32_t*)out) = col; |
| 531 | out += stride; |
| 532 | } |
| 533 | blk++; |
| 534 | } |
| 535 | break; |
| 536 | } |
| 537 | |
| 538 | } |
| 539 | |
| 540 | if ((ret = av_frame_ref(data, smk->pic)) < 0) |
| 541 | return ret; |
| 542 | |
| 543 | *got_frame = 1; |
| 544 | |
| 545 | /* always report that the buffer was completely consumed */ |
| 546 | return avpkt->size; |
| 547 | } |
| 548 | |
| 549 | |
| 550 | |
| 551 | /* |
| 552 | * |
| 553 | * Uninit smacker decoder |
| 554 | * |
| 555 | */ |
| 556 | static av_cold int decode_end(AVCodecContext *avctx) |
| 557 | { |
| 558 | SmackVContext * const smk = avctx->priv_data; |
| 559 | |
| 560 | av_freep(&smk->mmap_tbl); |
| 561 | av_freep(&smk->mclr_tbl); |
| 562 | av_freep(&smk->full_tbl); |
| 563 | av_freep(&smk->type_tbl); |
| 564 | |
| 565 | av_frame_free(&smk->pic); |
| 566 | |
| 567 | return 0; |
| 568 | } |
| 569 | |
| 570 | |
| 571 | /* |
| 572 | * |
| 573 | * Init smacker decoder |
| 574 | * |
| 575 | */ |
| 576 | static av_cold int decode_init(AVCodecContext *avctx) |
| 577 | { |
| 578 | SmackVContext * const c = avctx->priv_data; |
| 579 | int ret; |
| 580 | |
| 581 | c->avctx = avctx; |
| 582 | |
| 583 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| 584 | |
| 585 | c->pic = av_frame_alloc(); |
| 586 | if (!c->pic) |
| 587 | return AVERROR(ENOMEM); |
| 588 | |
| 589 | /* decode huffman trees from extradata */ |
| 590 | if(avctx->extradata_size < 16){ |
| 591 | av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n"); |
| 592 | return AVERROR(EINVAL); |
| 593 | } |
| 594 | |
| 595 | ret = decode_header_trees(c); |
| 596 | if (ret < 0) { |
| 597 | decode_end(avctx); |
| 598 | return ret; |
| 599 | } |
| 600 | |
| 601 | return 0; |
| 602 | } |
| 603 | |
| 604 | |
| 605 | static av_cold int smka_decode_init(AVCodecContext *avctx) |
| 606 | { |
| 607 | if (avctx->channels < 1 || avctx->channels > 2) { |
| 608 | av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n"); |
| 609 | return AVERROR(EINVAL); |
| 610 | } |
| 611 | avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; |
| 612 | avctx->sample_fmt = avctx->bits_per_coded_sample == 8 ? AV_SAMPLE_FMT_U8 : AV_SAMPLE_FMT_S16; |
| 613 | |
| 614 | return 0; |
| 615 | } |
| 616 | |
| 617 | /** |
| 618 | * Decode Smacker audio data |
| 619 | */ |
| 620 | static int smka_decode_frame(AVCodecContext *avctx, void *data, |
| 621 | int *got_frame_ptr, AVPacket *avpkt) |
| 622 | { |
| 623 | AVFrame *frame = data; |
| 624 | const uint8_t *buf = avpkt->data; |
| 625 | int buf_size = avpkt->size; |
| 626 | GetBitContext gb; |
| 627 | HuffContext h[4] = { { 0 } }; |
| 628 | VLC vlc[4] = { { 0 } }; |
| 629 | int16_t *samples; |
| 630 | uint8_t *samples8; |
| 631 | int val; |
| 632 | int i, res, ret; |
| 633 | int unp_size; |
| 634 | int bits, stereo; |
| 635 | int pred[2] = {0, 0}; |
| 636 | |
| 637 | if (buf_size <= 4) { |
| 638 | av_log(avctx, AV_LOG_ERROR, "packet is too small\n"); |
| 639 | return AVERROR(EINVAL); |
| 640 | } |
| 641 | |
| 642 | unp_size = AV_RL32(buf); |
| 643 | |
| 644 | if (unp_size > (1U<<24)) { |
| 645 | av_log(avctx, AV_LOG_ERROR, "packet is too big\n"); |
| 646 | return AVERROR_INVALIDDATA; |
| 647 | } |
| 648 | |
| 649 | if ((ret = init_get_bits8(&gb, buf + 4, buf_size - 4)) < 0) |
| 650 | return ret; |
| 651 | |
| 652 | if(!get_bits1(&gb)){ |
| 653 | av_log(avctx, AV_LOG_INFO, "Sound: no data\n"); |
| 654 | *got_frame_ptr = 0; |
| 655 | return 1; |
| 656 | } |
| 657 | stereo = get_bits1(&gb); |
| 658 | bits = get_bits1(&gb); |
| 659 | if (stereo ^ (avctx->channels != 1)) { |
| 660 | av_log(avctx, AV_LOG_ERROR, "channels mismatch\n"); |
| 661 | return AVERROR(EINVAL); |
| 662 | } |
| 663 | if (bits == (avctx->sample_fmt == AV_SAMPLE_FMT_U8)) { |
| 664 | av_log(avctx, AV_LOG_ERROR, "sample format mismatch\n"); |
| 665 | return AVERROR(EINVAL); |
| 666 | } |
| 667 | |
| 668 | /* get output buffer */ |
| 669 | frame->nb_samples = unp_size / (avctx->channels * (bits + 1)); |
| 670 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 671 | return ret; |
| 672 | samples = (int16_t *)frame->data[0]; |
| 673 | samples8 = frame->data[0]; |
| 674 | |
| 675 | // Initialize |
| 676 | for(i = 0; i < (1 << (bits + stereo)); i++) { |
| 677 | h[i].length = 256; |
| 678 | h[i].maxlength = 0; |
| 679 | h[i].current = 0; |
| 680 | h[i].bits = av_mallocz(256 * 4); |
| 681 | h[i].lengths = av_mallocz(256 * sizeof(int)); |
| 682 | h[i].values = av_mallocz(256 * sizeof(int)); |
| 683 | if (!h[i].bits || !h[i].lengths || !h[i].values) { |
| 684 | ret = AVERROR(ENOMEM); |
| 685 | goto error; |
| 686 | } |
| 687 | skip_bits1(&gb); |
| 688 | if (smacker_decode_tree(&gb, &h[i], 0, 0) < 0) { |
| 689 | ret = AVERROR_INVALIDDATA; |
| 690 | goto error; |
| 691 | } |
| 692 | skip_bits1(&gb); |
| 693 | if(h[i].current > 1) { |
| 694 | res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length, |
| 695 | h[i].lengths, sizeof(int), sizeof(int), |
| 696 | h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE); |
| 697 | if(res < 0) { |
| 698 | av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n"); |
| 699 | ret = AVERROR_INVALIDDATA; |
| 700 | goto error; |
| 701 | } |
| 702 | } |
| 703 | } |
| 704 | /* this codec relies on wraparound instead of clipping audio */ |
| 705 | if(bits) { //decode 16-bit data |
| 706 | for(i = stereo; i >= 0; i--) |
| 707 | pred[i] = sign_extend(av_bswap16(get_bits(&gb, 16)), 16); |
| 708 | for(i = 0; i <= stereo; i++) |
| 709 | *samples++ = pred[i]; |
| 710 | for(; i < unp_size / 2; i++) { |
| 711 | if(get_bits_left(&gb)<0) |
| 712 | return AVERROR_INVALIDDATA; |
| 713 | if(i & stereo) { |
| 714 | if(vlc[2].table) |
| 715 | res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3); |
| 716 | else |
| 717 | res = 0; |
| 718 | if (res < 0) { |
| 719 | av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
| 720 | return AVERROR_INVALIDDATA; |
| 721 | } |
| 722 | val = h[2].values[res]; |
| 723 | if(vlc[3].table) |
| 724 | res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3); |
| 725 | else |
| 726 | res = 0; |
| 727 | if (res < 0) { |
| 728 | av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
| 729 | return AVERROR_INVALIDDATA; |
| 730 | } |
| 731 | val |= h[3].values[res] << 8; |
| 732 | pred[1] += sign_extend(val, 16); |
| 733 | *samples++ = pred[1]; |
| 734 | } else { |
| 735 | if(vlc[0].table) |
| 736 | res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); |
| 737 | else |
| 738 | res = 0; |
| 739 | if (res < 0) { |
| 740 | av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
| 741 | return AVERROR_INVALIDDATA; |
| 742 | } |
| 743 | val = h[0].values[res]; |
| 744 | if(vlc[1].table) |
| 745 | res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); |
| 746 | else |
| 747 | res = 0; |
| 748 | if (res < 0) { |
| 749 | av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
| 750 | return AVERROR_INVALIDDATA; |
| 751 | } |
| 752 | val |= h[1].values[res] << 8; |
| 753 | pred[0] += sign_extend(val, 16); |
| 754 | *samples++ = pred[0]; |
| 755 | } |
| 756 | } |
| 757 | } else { //8-bit data |
| 758 | for(i = stereo; i >= 0; i--) |
| 759 | pred[i] = get_bits(&gb, 8); |
| 760 | for(i = 0; i <= stereo; i++) |
| 761 | *samples8++ = pred[i]; |
| 762 | for(; i < unp_size; i++) { |
| 763 | if(get_bits_left(&gb)<0) |
| 764 | return AVERROR_INVALIDDATA; |
| 765 | if(i & stereo){ |
| 766 | if(vlc[1].table) |
| 767 | res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); |
| 768 | else |
| 769 | res = 0; |
| 770 | if (res < 0) { |
| 771 | av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
| 772 | return AVERROR_INVALIDDATA; |
| 773 | } |
| 774 | pred[1] += sign_extend(h[1].values[res], 8); |
| 775 | *samples8++ = pred[1]; |
| 776 | } else { |
| 777 | if(vlc[0].table) |
| 778 | res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); |
| 779 | else |
| 780 | res = 0; |
| 781 | if (res < 0) { |
| 782 | av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
| 783 | return AVERROR_INVALIDDATA; |
| 784 | } |
| 785 | pred[0] += sign_extend(h[0].values[res], 8); |
| 786 | *samples8++ = pred[0]; |
| 787 | } |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | *got_frame_ptr = 1; |
| 792 | ret = buf_size; |
| 793 | |
| 794 | error: |
| 795 | for(i = 0; i < 4; i++) { |
| 796 | if(vlc[i].table) |
| 797 | ff_free_vlc(&vlc[i]); |
| 798 | av_free(h[i].bits); |
| 799 | av_free(h[i].lengths); |
| 800 | av_free(h[i].values); |
| 801 | } |
| 802 | |
| 803 | return ret; |
| 804 | } |
| 805 | |
| 806 | AVCodec ff_smacker_decoder = { |
| 807 | .name = "smackvid", |
| 808 | .long_name = NULL_IF_CONFIG_SMALL("Smacker video"), |
| 809 | .type = AVMEDIA_TYPE_VIDEO, |
| 810 | .id = AV_CODEC_ID_SMACKVIDEO, |
| 811 | .priv_data_size = sizeof(SmackVContext), |
| 812 | .init = decode_init, |
| 813 | .close = decode_end, |
| 814 | .decode = decode_frame, |
| 815 | .capabilities = CODEC_CAP_DR1, |
| 816 | }; |
| 817 | |
| 818 | AVCodec ff_smackaud_decoder = { |
| 819 | .name = "smackaud", |
| 820 | .long_name = NULL_IF_CONFIG_SMALL("Smacker audio"), |
| 821 | .type = AVMEDIA_TYPE_AUDIO, |
| 822 | .id = AV_CODEC_ID_SMACKAUDIO, |
| 823 | .init = smka_decode_init, |
| 824 | .decode = smka_decode_frame, |
| 825 | .capabilities = CODEC_CAP_DR1, |
| 826 | }; |