libavcodec/truemotion2.c

   1 /*
   2  * Duck/ON2 TrueMotion 2 Decoder
   3  * Copyright (c) 2005 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/truemotion2.c
  24  * Duck TrueMotion2 decoder.
  25  */
  26
  27 #include "avcodec.h"
  28 #include "get_bits.h"
  29 #include "dsputil.h"
  30
  31 #define TM2_ESCAPE 0x80000000
  32 #define TM2_DELTAS 64
  33 /* Huffman-coded streams of different types of blocks */
  34 enum TM2_STREAMS{ TM2_C_HI = 0, TM2_C_LO, TM2_L_HI, TM2_L_LO,
  35      TM2_UPD, TM2_MOT, TM2_TYPE, TM2_NUM_STREAMS};
  36 /* Block types */
  37 enum TM2_BLOCKS{ TM2_HI_RES = 0, TM2_MED_RES, TM2_LOW_RES, TM2_NULL_RES,
  38                  TM2_UPDATE, TM2_STILL, TM2_MOTION};
  39
  40 typedef struct TM2Context{
  41     AVCodecContext *avctx;
  42     AVFrame pic;
  43
  44     GetBitContext gb;
  45     DSPContext dsp;
  46
  47     /* TM2 streams */
  48     int *tokens[TM2_NUM_STREAMS];
  49     int tok_lens[TM2_NUM_STREAMS];
  50     int tok_ptrs[TM2_NUM_STREAMS];
  51     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];
  52     /* for blocks decoding */
  53     int D[4];
  54     int CD[4];
  55     int *last;
  56     int *clast;
  57
  58     /* data for current and previous frame */
  59     int *Y1, *U1, *V1, *Y2, *U2, *V2;
  60     int cur;
  61 } TM2Context;
  62
  63 /**
  64 * Huffman codes for each of streams
  65 */
  66 typedef struct TM2Codes{
  67     VLC vlc; ///< table for FFmpeg bitstream reader
  68     int bits;
  69     int *recode; ///< table for converting from code indexes to values
  70     int length;
  71 } TM2Codes;
  72
  73 /**
  74 * structure for gathering Huffman codes information
  75 */
  76 typedef struct TM2Huff{
  77     int val_bits; ///< length of literal
  78     int max_bits; ///< maximum length of code
  79     int min_bits; ///< minimum length of code
  80     int nodes; ///< total number of nodes in tree
  81     int num; ///< current number filled
  82     int max_num; ///< total number of codes
  83     int *nums; ///< literals
  84     uint32_t *bits; ///< codes
  85     int *lens; ///< codelengths
  86 } TM2Huff;
  87
  88 static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)
  89 {
  90     if(length > huff->max_bits) {
  91         av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n", huff->max_bits);
  92         return -1;
  93     }
  94
  95     if(!get_bits1(&ctx->gb)) { /* literal */
  96         if (length == 0) {
  97             length = 1;
  98         }
  99         if(huff->num >= huff->max_num) {
 100             av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");
 101             return -1;
 102         }
 103         huff->nums[huff->num] = get_bits_long(&ctx->gb, huff->val_bits);
 104         huff->bits[huff->num] = prefix;
 105         huff->lens[huff->num] = length;
 106         huff->num++;
 107         return 0;
 108     } else { /* non-terminal node */
 109         if(tm2_read_tree(ctx, prefix << 1, length + 1, huff) == -1)
 110             return -1;
 111         if(tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff) == -1)
 112             return -1;
 113     }
 114     return 0;
 115 }
 116
 117 static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
 118 {
 119     TM2Huff huff;
 120     int res = 0;
 121
 122     huff.val_bits = get_bits(&ctx->gb, 5);
 123     huff.max_bits = get_bits(&ctx->gb, 5);
 124     huff.min_bits = get_bits(&ctx->gb, 5);
 125     huff.nodes = get_bits_long(&ctx->gb, 17);
 126     huff.num = 0;
 127
 128     /* check for correct codes parameters */
 129     if((huff.val_bits < 1) || (huff.val_bits > 32) ||
 130        (huff.max_bits < 0) || (huff.max_bits > 32)) {
 131         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal length: %i, max code length: %i\n",
 132                huff.val_bits, huff.max_bits);
 133         return -1;
 134     }
 135     if((huff.nodes < 0) || (huff.nodes > 0x10000)) {
 136         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree nodes: %i\n", huff.nodes);
 137         return -1;
 138     }
 139     /* one-node tree */
 140     if(huff.max_bits == 0)
 141         huff.max_bits = 1;
 142
 143     /* allocate space for codes - it is exactly ceil(nodes / 2) entries */
 144     huff.max_num = (huff.nodes + 1) >> 1;
 145     huff.nums = av_mallocz(huff.max_num * sizeof(int));
 146     huff.bits = av_mallocz(huff.max_num * sizeof(uint32_t));
 147     huff.lens = av_mallocz(huff.max_num * sizeof(int));
 148
 149     if(tm2_read_tree(ctx, 0, 0, &huff) == -1)
 150         res = -1;
 151
 152     if(huff.num != huff.max_num) {
 153         av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",
 154                huff.num, huff.max_num);
 155         res = -1;
 156     }
 157
 158     /* convert codes to vlc_table */
 159     if(res != -1) {
 160         int i;
 161
 162         res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,
 163                     huff.lens, sizeof(int), sizeof(int),
 164                     huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);
 165         if(res < 0) {
 166             av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
 167             res = -1;
 168         } else
 169             res = 0;
 170         if(res != -1) {
 171             code->bits = huff.max_bits;
 172             code->length = huff.max_num;
 173             code->recode = av_malloc(code->length * sizeof(int));
 174             for(i = 0; i < code->length; i++)
 175                 code->recode[i] = huff.nums[i];
 176         }
 177     }
 178     /* free allocated memory */
 179     av_free(huff.nums);
 180     av_free(huff.bits);
 181     av_free(huff.lens);
 182
 183     return res;
 184 }
 185
 186 static void tm2_free_codes(TM2Codes *code)
 187 {
 188     if(code->recode)
 189         av_free(code->recode);
 190     if(code->vlc.table)
 191         free_vlc(&code->vlc);
 192 }
 193
 194 static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
 195 {
 196     int val;
 197     val = get_vlc2(gb, code->vlc.table, code->bits, 1);
 198     return code->recode[val];
 199 }
 200
 201 static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
 202 {
 203     uint32_t magic;
 204     const uint8_t *obuf;
 205     int length;
 206
 207     obuf = buf;
 208
 209     magic = AV_RL32(buf);
 210     buf += 4;
 211
 212     if(magic == 0x00000100) { /* old header */
 213 /*      av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */
 214         return 40;
 215     } else if(magic == 0x00000101) { /* new header */
 216         int w, h, size, flags, xr, yr;
 217
 218         length = AV_RL32(buf);
 219         buf += 4;
 220
 221         init_get_bits(&ctx->gb, buf, 32 * 8);
 222         size = get_bits_long(&ctx->gb, 31);
 223         h = get_bits(&ctx->gb, 15);
 224         w = get_bits(&ctx->gb, 15);
 225         flags = get_bits_long(&ctx->gb, 31);
 226         yr = get_bits(&ctx->gb, 9);
 227         xr = get_bits(&ctx->gb, 9);
 228
 229         return 40;
 230     } else {
 231         av_log (ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);
 232         return -1;
 233     }
 234
 235     return buf - obuf;
 236 }
 237
 238 static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
 239     int d, mb;
 240     int i, v;
 241
 242     d = get_bits(&ctx->gb, 9);
 243     mb = get_bits(&ctx->gb, 5);
 244
 245     if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
 246         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
 247         return -1;
 248     }
 249
 250     for(i = 0; i < d; i++) {
 251         v = get_bits_long(&ctx->gb, mb);
 252         if(v & (1 << (mb - 1)))
 253             ctx->deltas[stream_id][i] = v - (1 << mb);
 254         else
 255             ctx->deltas[stream_id][i] = v;
 256     }
 257     for(; i < TM2_DELTAS; i++)
 258         ctx->deltas[stream_id][i] = 0;
 259
 260     return 0;
 261 }
 262
 263 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id) {
 264     int i;
 265     int cur = 0;
 266     int skip = 0;
 267     int len, toks;
 268     TM2Codes codes;
 269
 270     /* get stream length in dwords */
 271     len = AV_RB32(buf); buf += 4; cur += 4;
 272     skip = len * 4 + 4;
 273
 274     if(len == 0)
 275         return 4;
 276
 277     toks = AV_RB32(buf); buf += 4; cur += 4;
 278     if(toks & 1) {
 279         len = AV_RB32(buf); buf += 4; cur += 4;
 280         if(len == TM2_ESCAPE) {
 281             len = AV_RB32(buf); buf += 4; cur += 4;
 282         }
 283         if(len > 0) {
 284             init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
 285             if(tm2_read_deltas(ctx, stream_id) == -1)
 286                 return -1;
 287             buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
 288             cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
 289         }
 290     }
 291     /* skip unused fields */
 292     if(AV_RB32(buf) == TM2_ESCAPE) {
 293         buf += 4; cur += 4; /* some unknown length - could be escaped too */
 294     }
 295     buf += 4; cur += 4;
 296     buf += 4; cur += 4; /* unused by decoder */
 297
 298     init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
 299     if(tm2_build_huff_table(ctx, &codes) == -1)
 300         return -1;
 301     buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
 302     cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
 303
 304     toks >>= 1;
 305     /* check if we have sane number of tokens */
 306     if((toks < 0) || (toks > 0xFFFFFF)){
 307         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
 308         tm2_free_codes(&codes);
 309         return -1;
 310     }
 311     ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
 312     ctx->tok_lens[stream_id] = toks;
 313     len = AV_RB32(buf); buf += 4; cur += 4;
 314     if(len > 0) {
 315         init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
 316         for(i = 0; i < toks; i++)
 317             ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
 318     } else {
 319         for(i = 0; i < toks; i++)
 320             ctx->tokens[stream_id][i] = codes.recode[0];
 321     }
 322     tm2_free_codes(&codes);
 323
 324     return skip;
 325 }
 326
 327 static inline int GET_TOK(TM2Context *ctx,int type) {
 328     if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
 329         av_log(ctx->avctx, AV_LOG_ERROR, "Read token from stream %i out of bounds (%i>=%i)\n", type, ctx->tok_ptrs[type], ctx->tok_lens[type]);
 330         return 0;
 331     }
 332     if(type <= TM2_MOT)
 333         return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
 334     return ctx->tokens[type][ctx->tok_ptrs[type]++];
 335 }
 336
 337 /* blocks decoding routines */
 338
 339 /* common Y, U, V pointers initialisation */
 340 #define TM2_INIT_POINTERS() \
 341     int *last, *clast; \
 342     int *Y, *U, *V;\
 343     int Ystride, Ustride, Vstride;\
 344 \
 345     Ystride = ctx->avctx->width;\
 346     Vstride = (ctx->avctx->width + 1) >> 1;\
 347     Ustride = (ctx->avctx->width + 1) >> 1;\
 348     Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
 349     V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
 350     U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
 351     last = ctx->last + bx * 4;\
 352     clast = ctx->clast + bx * 4;
 353
 354 #define TM2_INIT_POINTERS_2() \
 355     int *Yo, *Uo, *Vo;\
 356     int oYstride, oUstride, oVstride;\
 357 \
 358     TM2_INIT_POINTERS();\
 359     oYstride = Ystride;\
 360     oVstride = Vstride;\
 361     oUstride = Ustride;\
 362     Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
 363     Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
 364     Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
 365
 366 /* recalculate last and delta values for next blocks */
 367 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
 368     CD[0] = CHR[1] - last[1];\
 369     CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
 370     last[0] = (int)CHR[stride + 0];\
 371     last[1] = (int)CHR[stride + 1];}
 372
 373 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
 374 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
 375 {
 376     int ct, d;
 377     int i, j;
 378
 379     for(j = 0; j < 4; j++){
 380         ct = ctx->D[j];
 381         for(i = 0; i < 4; i++){
 382             d = deltas[i + j * 4];
 383             ct += d;
 384             last[i] += ct;
 385             Y[i] = av_clip_uint8(last[i]);
 386         }
 387         Y += stride;
 388         ctx->D[j] = ct;
 389     }
 390 }
 391
 392 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
 393 {
 394     int i, j;
 395     for(j = 0; j < 2; j++){
 396         for(i = 0; i < 2; i++){
 397             CD[j] += deltas[i + j * 2];
 398             last[i] += CD[j];
 399             data[i] = last[i];
 400         }
 401         data += stride;
 402     }
 403 }
 404
 405 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
 406 {
 407     int t;
 408     int l;
 409     int prev;
 410
 411     if(bx > 0)
 412         prev = clast[-3];
 413     else
 414         prev = 0;
 415     t = (CD[0] + CD[1]) >> 1;
 416     l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
 417     CD[1] = CD[0] + CD[1] - t;
 418     CD[0] = t;
 419     clast[0] = l;
 420
 421     tm2_high_chroma(data, stride, clast, CD, deltas);
 422 }
 423
 424 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
 425 {
 426     int i;
 427     int deltas[16];
 428     TM2_INIT_POINTERS();
 429
 430     /* hi-res chroma */
 431     for(i = 0; i < 4; i++) {
 432         deltas[i] = GET_TOK(ctx, TM2_C_HI);
 433         deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
 434     }
 435     tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
 436     tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
 437
 438     /* hi-res luma */
 439     for(i = 0; i < 16; i++)
 440         deltas[i] = GET_TOK(ctx, TM2_L_HI);
 441
 442     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
 443 }
 444
 445 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
 446 {
 447     int i;
 448     int deltas[16];
 449     TM2_INIT_POINTERS();
 450
 451     /* low-res chroma */
 452     deltas[0] = GET_TOK(ctx, TM2_C_LO);
 453     deltas[1] = deltas[2] = deltas[3] = 0;
 454     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
 455
 456     deltas[0] = GET_TOK(ctx, TM2_C_LO);
 457     deltas[1] = deltas[2] = deltas[3] = 0;
 458     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
 459
 460     /* hi-res luma */
 461     for(i = 0; i < 16; i++)
 462         deltas[i] = GET_TOK(ctx, TM2_L_HI);
 463
 464     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
 465 }
 466
 467 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
 468 {
 469     int i;
 470     int t1, t2;
 471     int deltas[16];
 472     TM2_INIT_POINTERS();
 473
 474     /* low-res chroma */
 475     deltas[0] = GET_TOK(ctx, TM2_C_LO);
 476     deltas[1] = deltas[2] = deltas[3] = 0;
 477     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
 478
 479     deltas[0] = GET_TOK(ctx, TM2_C_LO);
 480     deltas[1] = deltas[2] = deltas[3] = 0;
 481     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
 482
 483     /* low-res luma */
 484     for(i = 0; i < 16; i++)
 485         deltas[i] = 0;
 486
 487     deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
 488     deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
 489     deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
 490     deltas[10] = GET_TOK(ctx, TM2_L_LO);
 491
 492     if(bx > 0)
 493         last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
 494     else
 495         last[0] = (last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
 496     last[2] = (last[1] + last[3]) >> 1;
 497
 498     t1 = ctx->D[0] + ctx->D[1];
 499     ctx->D[0] = t1 >> 1;
 500     ctx->D[1] = t1 - (t1 >> 1);
 501     t2 = ctx->D[2] + ctx->D[3];
 502     ctx->D[2] = t2 >> 1;
 503     ctx->D[3] = t2 - (t2 >> 1);
 504
 505     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
 506 }
 507
 508 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
 509 {
 510     int i;
 511     int ct;
 512     int left, right, diff;
 513     int deltas[16];
 514     TM2_INIT_POINTERS();
 515
 516     /* null chroma */
 517     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
 518     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
 519
 520     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
 521     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
 522
 523     /* null luma */
 524     for(i = 0; i < 16; i++)
 525         deltas[i] = 0;
 526
 527     ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
 528
 529     if(bx > 0)
 530         left = last[-1] - ct;
 531     else
 532         left = 0;
 533
 534     right = last[3];
 535     diff = right - left;
 536     last[0] = left + (diff >> 2);
 537     last[1] = left + (diff >> 1);
 538     last[2] = right - (diff >> 2);
 539     last[3] = right;
 540     {
 541         int tp = left;
 542
 543         ctx->D[0] = (tp + (ct >> 2)) - left;
 544         left += ctx->D[0];
 545         ctx->D[1] = (tp + (ct >> 1)) - left;
 546         left += ctx->D[1];
 547         ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
 548         left += ctx->D[2];
 549         ctx->D[3] = (tp + ct) - left;
 550     }
 551     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
 552 }
 553
 554 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
 555 {
 556     int i, j;
 557     TM2_INIT_POINTERS_2();
 558
 559     /* update chroma */
 560     for(j = 0; j < 2; j++){
 561         for(i = 0; i < 2; i++){
 562             U[i] = Uo[i];
 563             V[i] = Vo[i];
 564         }
 565         U += Ustride; V += Vstride;
 566         Uo += oUstride; Vo += oVstride;
 567     }
 568     U -= Ustride * 2;
 569     V -= Vstride * 2;
 570     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
 571     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
 572
 573     /* update deltas */
 574     ctx->D[0] = Yo[3] - last[3];
 575     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
 576     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
 577     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
 578
 579     for(j = 0; j < 4; j++){
 580         for(i = 0; i < 4; i++){
 581             Y[i] = Yo[i];
 582             last[i] = Yo[i];
 583         }
 584         Y += Ystride;
 585         Yo += oYstride;
 586     }
 587 }
 588
 589 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
 590 {
 591     int i, j;
 592     int d;
 593     TM2_INIT_POINTERS_2();
 594
 595     /* update chroma */
 596     for(j = 0; j < 2; j++){
 597         for(i = 0; i < 2; i++){
 598             U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
 599             V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
 600         }
 601         U += Ustride; V += Vstride;
 602         Uo += oUstride; Vo += oVstride;
 603     }
 604     U -= Ustride * 2;
 605     V -= Vstride * 2;
 606     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
 607     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
 608
 609     /* update deltas */
 610     ctx->D[0] = Yo[3] - last[3];
 611     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
 612     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
 613     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
 614
 615     for(j = 0; j < 4; j++){
 616         d = last[3];
 617         for(i = 0; i < 4; i++){
 618             Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
 619             last[i] = Y[i];
 620         }
 621         ctx->D[j] = last[3] - d;
 622         Y += Ystride;
 623         Yo += oYstride;
 624     }
 625 }
 626
 627 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
 628 {
 629     int i, j;
 630     int mx, my;
 631     TM2_INIT_POINTERS_2();
 632
 633     mx = GET_TOK(ctx, TM2_MOT);
 634     my = GET_TOK(ctx, TM2_MOT);
 635
 636     Yo += my * oYstride + mx;
 637     Uo += (my >> 1) * oUstride + (mx >> 1);
 638     Vo += (my >> 1) * oVstride + (mx >> 1);
 639
 640     /* copy chroma */
 641     for(j = 0; j < 2; j++){
 642         for(i = 0; i < 2; i++){
 643             U[i] = Uo[i];
 644             V[i] = Vo[i];
 645         }
 646         U += Ustride; V += Vstride;
 647         Uo += oUstride; Vo += oVstride;
 648     }
 649     U -= Ustride * 2;
 650     V -= Vstride * 2;
 651     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
 652     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
 653
 654     /* copy luma */
 655     for(j = 0; j < 4; j++){
 656         for(i = 0; i < 4; i++){
 657             Y[i] = Yo[i];
 658         }
 659         Y += Ystride;
 660         Yo += oYstride;
 661     }
 662     /* calculate deltas */
 663     Y -= Ystride * 4;
 664     ctx->D[0] = Y[3] - last[3];
 665     ctx->D[1] = Y[3 + Ystride] - Y[3];
 666     ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
 667     ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
 668     for(i = 0; i < 4; i++)
 669         last[i] = Y[i + Ystride * 3];
 670 }
 671
 672 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
 673 {
 674     int i, j;
 675     int bw, bh;
 676     int type;
 677     int keyframe = 1;
 678     int *Y, *U, *V;
 679     uint8_t *dst;
 680
 681     bw = ctx->avctx->width >> 2;
 682     bh = ctx->avctx->height >> 2;
 683
 684     for(i = 0; i < TM2_NUM_STREAMS; i++)
 685         ctx->tok_ptrs[i] = 0;
 686
 687     if (ctx->tok_lens[TM2_TYPE]<bw*bh){
 688         av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
 689         return -1;
 690     }
 691
 692     memset(ctx->last, 0, 4 * bw * sizeof(int));
 693     memset(ctx->clast, 0, 4 * bw * sizeof(int));
 694
 695     for(j = 0; j < bh; j++) {
 696         memset(ctx->D, 0, 4 * sizeof(int));
 697         memset(ctx->CD, 0, 4 * sizeof(int));
 698         for(i = 0; i < bw; i++) {
 699             type = GET_TOK(ctx, TM2_TYPE);
 700             switch(type) {
 701             case TM2_HI_RES:
 702                 tm2_hi_res_block(ctx, p, i, j);
 703                 break;
 704             case TM2_MED_RES:
 705                 tm2_med_res_block(ctx, p, i, j);
 706                 break;
 707             case TM2_LOW_RES:
 708                 tm2_low_res_block(ctx, p, i, j);
 709                 break;
 710             case TM2_NULL_RES:
 711                 tm2_null_res_block(ctx, p, i, j);
 712                 break;
 713             case TM2_UPDATE:
 714                 tm2_update_block(ctx, p, i, j);
 715                 keyframe = 0;
 716                 break;
 717             case TM2_STILL:
 718                 tm2_still_block(ctx, p, i, j);
 719                 keyframe = 0;
 720                 break;
 721             case TM2_MOTION:
 722                 tm2_motion_block(ctx, p, i, j);
 723                 keyframe = 0;
 724                 break;
 725             default:
 726                 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
 727             }
 728         }
 729     }
 730
 731     /* copy data from our buffer to AVFrame */
 732     Y = (ctx->cur?ctx->Y2:ctx->Y1);
 733     U = (ctx->cur?ctx->U2:ctx->U1);
 734     V = (ctx->cur?ctx->V2:ctx->V1);
 735     dst = p->data[0];
 736     for(j = 0; j < ctx->avctx->height; j++){
 737         for(i = 0; i < ctx->avctx->width; i++){
 738             int y = Y[i], u = U[i >> 1], v = V[i >> 1];
 739             dst[3*i+0] = av_clip_uint8(y + v);
 740             dst[3*i+1] = av_clip_uint8(y);
 741             dst[3*i+2] = av_clip_uint8(y + u);
 742         }
 743         Y += ctx->avctx->width;
 744         if (j & 1) {
 745             U += ctx->avctx->width >> 1;
 746             V += ctx->avctx->width >> 1;
 747         }
 748         dst += p->linesize[0];
 749     }
 750
 751     return keyframe;
 752 }
 753
 754 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
 755     TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
 756 };
 757
 758 static int decode_frame(AVCodecContext *avctx,
 759                         void *data, int *data_size,
 760                         AVPacket *avpkt)
 761 {
 762     const uint8_t *buf = avpkt->data;
 763     int buf_size = avpkt->size;
 764     TM2Context * const l = avctx->priv_data;
 765     AVFrame * const p= (AVFrame*)&l->pic;
 766     int i, skip, t;
 767     uint8_t *swbuf;
 768
 769     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
 770     if(!swbuf){
 771         av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
 772         return -1;
 773     }
 774     p->reference = 1;
 775     p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 776     if(avctx->reget_buffer(avctx, p) < 0){
 777         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 778         av_free(swbuf);
 779         return -1;
 780     }
 781
 782     l->dsp.bswap_buf((uint32_t*)swbuf, (const uint32_t*)buf, buf_size >> 2);
 783     skip = tm2_read_header(l, swbuf);
 784
 785     if(skip == -1){
 786         av_free(swbuf);
 787         return -1;
 788     }
 789
 790     for(i = 0; i < TM2_NUM_STREAMS; i++){
 791         t = tm2_read_stream(l, swbuf + skip, tm2_stream_order[i]);
 792         if(t == -1){
 793             av_free(swbuf);
 794             return -1;
 795         }
 796         skip += t;
 797     }
 798     p->key_frame = tm2_decode_blocks(l, p);
 799     if(p->key_frame)
 800         p->pict_type = FF_I_TYPE;
 801     else
 802         p->pict_type = FF_P_TYPE;
 803
 804     l->cur = !l->cur;
 805     *data_size = sizeof(AVFrame);
 806     *(AVFrame*)data = l->pic;
 807     av_free(swbuf);
 808
 809     return buf_size;
 810 }
 811
 812 static av_cold int decode_init(AVCodecContext *avctx){
 813     TM2Context * const l = avctx->priv_data;
 814     int i;
 815
 816     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
 817         return -1;
 818     }
 819     if((avctx->width & 3) || (avctx->height & 3)){
 820         av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
 821         return -1;
 822     }
 823
 824     l->avctx = avctx;
 825     l->pic.data[0]=NULL;
 826     avctx->pix_fmt = PIX_FMT_BGR24;
 827
 828     dsputil_init(&l->dsp, avctx);
 829
 830     l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
 831     l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
 832
 833     for(i = 0; i < TM2_NUM_STREAMS; i++) {
 834         l->tokens[i] = NULL;
 835         l->tok_lens[i] = 0;
 836     }
 837
 838     l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);
 839     l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
 840     l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
 841     l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);
 842     l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
 843     l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
 844     l->cur = 0;
 845
 846     return 0;
 847 }
 848
 849 static av_cold int decode_end(AVCodecContext *avctx){
 850     TM2Context * const l = avctx->priv_data;
 851     int i;
 852
 853     if(l->last)
 854         av_free(l->last);
 855     if(l->clast)
 856         av_free(l->clast);
 857     for(i = 0; i < TM2_NUM_STREAMS; i++)
 858         if(l->tokens[i])
 859             av_free(l->tokens[i]);
 860     if(l->Y1){
 861         av_free(l->Y1);
 862         av_free(l->U1);
 863         av_free(l->V1);
 864         av_free(l->Y2);
 865         av_free(l->U2);
 866         av_free(l->V2);
 867     }
 868     return 0;
 869 }
 870
 871 AVCodec truemotion2_decoder = {
 872     "truemotion2",
 873     CODEC_TYPE_VIDEO,
 874     CODEC_ID_TRUEMOTION2,
 875     sizeof(TM2Context),
 876     decode_init,
 877     NULL,
 878     decode_end,
 879     decode_frame,
 880     CODEC_CAP_DR1,
 881     .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
 882 };