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FFmpeg/libavcodec/truemotion2.c

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  1. /*

  2.  * Duck/ON2 TrueMotion 2 Decoder

  3.  * Copyright (c) 2005 Konstantin Shishkov

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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.  * 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 Libav 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.     av_free(code->recode);

  189.     if(code->vlc.table)

  190.         free_vlc(&code->vlc);

  191. }

  192. 

  193. static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)

  194. {

  195.     int val;

  196.     val = get_vlc2(gb, code->vlc.table, code->bits, 1);

  197.     return code->recode[val];

  198. }

  199. 

  200. static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)

  201. {

  202.     uint32_t magic;

  203.     const uint8_t *obuf;

  204.     int length;

  205. 

  206.     obuf = buf;

  207. 

  208.     magic = AV_RL32(buf);

  209.     buf += 4;

  210. 

  211.     if(magic == 0x00000100) { /* old header */

  212. /*      av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */

  213.         return 40;

  214.     } else if(magic == 0x00000101) { /* new header */

  215.         int w, h, size, flags, xr, yr;

  216. 

  217.         length = AV_RL32(buf);

  218.         buf += 4;

  219. 

  220.         init_get_bits(&ctx->gb, buf, 32 * 8);

  221.         size = get_bits_long(&ctx->gb, 31);

  222.         h = get_bits(&ctx->gb, 15);

  223.         w = get_bits(&ctx->gb, 15);

  224.         flags = get_bits_long(&ctx->gb, 31);

  225.         yr = get_bits(&ctx->gb, 9);

  226.         xr = get_bits(&ctx->gb, 9);

  227. 

  228.         return 40;

  229.     } else {

  230.         av_log (ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);

  231.         return -1;

  232.     }

  233. 

  234.     return buf - obuf;

  235. }

  236. 

  237. static int tm2_read_deltas(TM2Context *ctx, int stream_id) {

  238.     int d, mb;

  239.     int i, v;

  240. 

  241.     d = get_bits(&ctx->gb, 9);

  242.     mb = get_bits(&ctx->gb, 5);

  243. 

  244.     if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {

  245.         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);

  246.         return -1;

  247.     }

  248. 

  249.     for(i = 0; i < d; i++) {

  250.         v = get_bits_long(&ctx->gb, mb);

  251.         if(v & (1 << (mb - 1)))

  252.             ctx->deltas[stream_id][i] = v - (1 << mb);

  253.         else

  254.             ctx->deltas[stream_id][i] = v;

  255.     }

  256.     for(; i < TM2_DELTAS; i++)

  257.         ctx->deltas[stream_id][i] = 0;

  258. 

  259.     return 0;

  260. }

  261. 

  262. static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, int buf_size)

  263. {

  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.     if (len >= INT_MAX/4-1 || len < 0 || len > buf_size) {

  278.         av_log(ctx->avctx, AV_LOG_ERROR, "Error, invalid stream size.\n");

  279.         return -1;

  280.     }

  281. 

  282.     toks = AV_RB32(buf); buf += 4; cur += 4;

  283.     if(toks & 1) {

  284.         len = AV_RB32(buf); buf += 4; cur += 4;

  285.         if(len == TM2_ESCAPE) {

  286.             len = AV_RB32(buf); buf += 4; cur += 4;

  287.         }

  288.         if(len > 0) {

  289.             init_get_bits(&ctx->gb, buf, (skip - cur) * 8);

  290.             if(tm2_read_deltas(ctx, stream_id) == -1)

  291.                 return -1;

  292.             buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;

  293.             cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;

  294.         }

  295.     }

  296.     /* skip unused fields */

  297.     if(AV_RB32(buf) == TM2_ESCAPE) {

  298.         buf += 4; cur += 4; /* some unknown length - could be escaped too */

  299.     }

  300.     buf += 4; cur += 4;

  301.     buf += 4; cur += 4; /* unused by decoder */

  302. 

  303.     init_get_bits(&ctx->gb, buf, (skip - cur) * 8);

  304.     if(tm2_build_huff_table(ctx, &codes) == -1)

  305.         return -1;

  306.     buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;

  307.     cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;

  308. 

  309.     toks >>= 1;

  310.     /* check if we have sane number of tokens */

  311.     if((toks < 0) || (toks > 0xFFFFFF)){

  312.         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);

  313.         tm2_free_codes(&codes);

  314.         return -1;

  315.     }

  316.     ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));

  317.     ctx->tok_lens[stream_id] = toks;

  318.     len = AV_RB32(buf); buf += 4; cur += 4;

  319.     if(len > 0) {

  320.         init_get_bits(&ctx->gb, buf, (skip - cur) * 8);

  321.         for(i = 0; i < toks; i++) {

  322.             if (get_bits_left(&ctx->gb) <= 0) {

  323.                 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);

  324.                 return -1;

  325.             }

  326.             ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);

  327.         }

  328.     } else {

  329.         for(i = 0; i < toks; i++)

  330.             ctx->tokens[stream_id][i] = codes.recode[0];

  331.     }

  332.     tm2_free_codes(&codes);

  333. 

  334.     return skip;

  335. }

  336. 

  337. static inline int GET_TOK(TM2Context *ctx,int type) {

  338.     if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {

  339.         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]);

  340.         return 0;

  341.     }

  342.     if(type <= TM2_MOT)

  343.         return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];

  344.     return ctx->tokens[type][ctx->tok_ptrs[type]++];

  345. }

  346. 

  347. /* blocks decoding routines */

  348. 

  349. /* common Y, U, V pointers initialisation */

  350. #define TM2_INIT_POINTERS() \

  351.     int *last, *clast; \

  352.     int *Y, *U, *V;\

  353.     int Ystride, Ustride, Vstride;\

  354. \

  355.     Ystride = ctx->avctx->width;\

  356.     Vstride = (ctx->avctx->width + 1) >> 1;\

  357.     Ustride = (ctx->avctx->width + 1) >> 1;\

  358.     Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\

  359.     V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\

  360.     U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\

  361.     last = ctx->last + bx * 4;\

  362.     clast = ctx->clast + bx * 4;

  363. 

  364. #define TM2_INIT_POINTERS_2() \

  365.     int *Yo, *Uo, *Vo;\

  366.     int oYstride, oUstride, oVstride;\

  367. \

  368.     TM2_INIT_POINTERS();\

  369.     oYstride = Ystride;\

  370.     oVstride = Vstride;\

  371.     oUstride = Ustride;\

  372.     Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\

  373.     Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\

  374.     Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;

  375. 

  376. /* recalculate last and delta values for next blocks */

  377. #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\

  378.     CD[0] = CHR[1] - last[1];\

  379.     CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\

  380.     last[0] = (int)CHR[stride + 0];\

  381.     last[1] = (int)CHR[stride + 1];}

  382. 

  383. /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */

  384. static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)

  385. {

  386.     int ct, d;

  387.     int i, j;

  388. 

  389.     for(j = 0; j < 4; j++){

  390.         ct = ctx->D[j];

  391.         for(i = 0; i < 4; i++){

  392.             d = deltas[i + j * 4];

  393.             ct += d;

  394.             last[i] += ct;

  395.             Y[i] = av_clip_uint8(last[i]);

  396.         }

  397.         Y += stride;

  398.         ctx->D[j] = ct;

  399.     }

  400. }

  401. 

  402. static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)

  403. {

  404.     int i, j;

  405.     for(j = 0; j < 2; j++){

  406.         for(i = 0; i < 2; i++){

  407.             CD[j] += deltas[i + j * 2];

  408.             last[i] += CD[j];

  409.             data[i] = last[i];

  410.         }

  411.         data += stride;

  412.     }

  413. }

  414. 

  415. static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)

  416. {

  417.     int t;

  418.     int l;

  419.     int prev;

  420. 

  421.     if(bx > 0)

  422.         prev = clast[-3];

  423.     else

  424.         prev = 0;

  425.     t = (CD[0] + CD[1]) >> 1;

  426.     l = (prev - CD[0] - CD[1] + clast[1]) >> 1;

  427.     CD[1] = CD[0] + CD[1] - t;

  428.     CD[0] = t;

  429.     clast[0] = l;

  430. 

  431.     tm2_high_chroma(data, stride, clast, CD, deltas);

  432. }

  433. 

  434. static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

  435. {

  436.     int i;

  437.     int deltas[16];

  438.     TM2_INIT_POINTERS();

  439. 

  440.     /* hi-res chroma */

  441.     for(i = 0; i < 4; i++) {

  442.         deltas[i] = GET_TOK(ctx, TM2_C_HI);

  443.         deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);

  444.     }

  445.     tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);

  446.     tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);

  447. 

  448.     /* hi-res luma */

  449.     for(i = 0; i < 16; i++)

  450.         deltas[i] = GET_TOK(ctx, TM2_L_HI);

  451. 

  452.     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);

  453. }

  454. 

  455. static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

  456. {

  457.     int i;

  458.     int deltas[16];

  459.     TM2_INIT_POINTERS();

  460. 

  461.     /* low-res chroma */

  462.     deltas[0] = GET_TOK(ctx, TM2_C_LO);

  463.     deltas[1] = deltas[2] = deltas[3] = 0;

  464.     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);

  465. 

  466.     deltas[0] = GET_TOK(ctx, TM2_C_LO);

  467.     deltas[1] = deltas[2] = deltas[3] = 0;

  468.     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);

  469. 

  470.     /* hi-res luma */

  471.     for(i = 0; i < 16; i++)

  472.         deltas[i] = GET_TOK(ctx, TM2_L_HI);

  473. 

  474.     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);

  475. }

  476. 

  477. static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

  478. {

  479.     int i;

  480.     int t1, t2;

  481.     int deltas[16];

  482.     TM2_INIT_POINTERS();

  483. 

  484.     /* low-res chroma */

  485.     deltas[0] = GET_TOK(ctx, TM2_C_LO);

  486.     deltas[1] = deltas[2] = deltas[3] = 0;

  487.     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);

  488. 

  489.     deltas[0] = GET_TOK(ctx, TM2_C_LO);

  490.     deltas[1] = deltas[2] = deltas[3] = 0;

  491.     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);

  492. 

  493.     /* low-res luma */

  494.     for(i = 0; i < 16; i++)

  495.         deltas[i] = 0;

  496. 

  497.     deltas[ 0] = GET_TOK(ctx, TM2_L_LO);

  498.     deltas[ 2] = GET_TOK(ctx, TM2_L_LO);

  499.     deltas[ 8] = GET_TOK(ctx, TM2_L_LO);

  500.     deltas[10] = GET_TOK(ctx, TM2_L_LO);

  501. 

  502.     if(bx > 0)

  503.         last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;

  504.     else

  505.         last[0] = (last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;

  506.     last[2] = (last[1] + last[3]) >> 1;

  507. 

  508.     t1 = ctx->D[0] + ctx->D[1];

  509.     ctx->D[0] = t1 >> 1;

  510.     ctx->D[1] = t1 - (t1 >> 1);

  511.     t2 = ctx->D[2] + ctx->D[3];

  512.     ctx->D[2] = t2 >> 1;

  513.     ctx->D[3] = t2 - (t2 >> 1);

  514. 

  515.     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);

  516. }

  517. 

  518. static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

  519. {

  520.     int i;

  521.     int ct;

  522.     int left, right, diff;

  523.     int deltas[16];

  524.     TM2_INIT_POINTERS();

  525. 

  526.     /* null chroma */

  527.     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;

  528.     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);

  529. 

  530.     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;

  531.     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);

  532. 

  533.     /* null luma */

  534.     for(i = 0; i < 16; i++)

  535.         deltas[i] = 0;

  536. 

  537.     ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];

  538. 

  539.     if(bx > 0)

  540.         left = last[-1] - ct;

  541.     else

  542.         left = 0;

  543. 

  544.     right = last[3];

  545.     diff = right - left;

  546.     last[0] = left + (diff >> 2);

  547.     last[1] = left + (diff >> 1);

  548.     last[2] = right - (diff >> 2);

  549.     last[3] = right;

  550.     {

  551.         int tp = left;

  552. 

  553.         ctx->D[0] = (tp + (ct >> 2)) - left;

  554.         left += ctx->D[0];

  555.         ctx->D[1] = (tp + (ct >> 1)) - left;

  556.         left += ctx->D[1];

  557.         ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;

  558.         left += ctx->D[2];

  559.         ctx->D[3] = (tp + ct) - left;

  560.     }

  561.     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);

  562. }

  563. 

  564. static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

  565. {

  566.     int i, j;

  567.     TM2_INIT_POINTERS_2();

  568. 

  569.     /* update chroma */

  570.     for(j = 0; j < 2; j++){

  571.         for(i = 0; i < 2; i++){

  572.             U[i] = Uo[i];

  573.             V[i] = Vo[i];

  574.         }

  575.         U += Ustride; V += Vstride;

  576.         Uo += oUstride; Vo += oVstride;

  577.     }

  578.     U -= Ustride * 2;

  579.     V -= Vstride * 2;

  580.     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);

  581.     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));

  582. 

  583.     /* update deltas */

  584.     ctx->D[0] = Yo[3] - last[3];

  585.     ctx->D[1] = Yo[3 + oYstride] - Yo[3];

  586.     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];

  587.     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];

  588. 

  589.     for(j = 0; j < 4; j++){

  590.         for(i = 0; i < 4; i++){

  591.             Y[i] = Yo[i];

  592.             last[i] = Yo[i];

  593.         }

  594.         Y += Ystride;

  595.         Yo += oYstride;

  596.     }

  597. }

  598. 

  599. static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

  600. {

  601.     int i, j;

  602.     int d;

  603.     TM2_INIT_POINTERS_2();

  604. 

  605.     /* update chroma */

  606.     for(j = 0; j < 2; j++){

  607.         for(i = 0; i < 2; i++){

  608.             U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);

  609.             V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);

  610.         }

  611.         U += Ustride; V += Vstride;

  612.         Uo += oUstride; Vo += oVstride;

  613.     }

  614.     U -= Ustride * 2;

  615.     V -= Vstride * 2;

  616.     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);

  617.     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));

  618. 

  619.     /* update deltas */

  620.     ctx->D[0] = Yo[3] - last[3];

  621.     ctx->D[1] = Yo[3 + oYstride] - Yo[3];

  622.     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];

  623.     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];

  624. 

  625.     for(j = 0; j < 4; j++){

  626.         d = last[3];

  627.         for(i = 0; i < 4; i++){

  628.             Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);

  629.             last[i] = Y[i];

  630.         }

  631.         ctx->D[j] = last[3] - d;

  632.         Y += Ystride;

  633.         Yo += oYstride;

  634.     }

  635. }

  636. 

  637. static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

  638. {

  639.     int i, j;

  640.     int mx, my;

  641.     TM2_INIT_POINTERS_2();

  642. 

  643.     mx = GET_TOK(ctx, TM2_MOT);

  644.     my = GET_TOK(ctx, TM2_MOT);

  645. 

  646.     Yo += my * oYstride + mx;

  647.     Uo += (my >> 1) * oUstride + (mx >> 1);

  648.     Vo += (my >> 1) * oVstride + (mx >> 1);

  649. 

  650.     /* copy chroma */

  651.     for(j = 0; j < 2; j++){

  652.         for(i = 0; i < 2; i++){

  653.             U[i] = Uo[i];

  654.             V[i] = Vo[i];

  655.         }

  656.         U += Ustride; V += Vstride;

  657.         Uo += oUstride; Vo += oVstride;

  658.     }

  659.     U -= Ustride * 2;

  660.     V -= Vstride * 2;

  661.     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);

  662.     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));

  663. 

  664.     /* copy luma */

  665.     for(j = 0; j < 4; j++){

  666.         for(i = 0; i < 4; i++){

  667.             Y[i] = Yo[i];

  668.         }

  669.         Y += Ystride;

  670.         Yo += oYstride;

  671.     }

  672.     /* calculate deltas */

  673.     Y -= Ystride * 4;

  674.     ctx->D[0] = Y[3] - last[3];

  675.     ctx->D[1] = Y[3 + Ystride] - Y[3];

  676.     ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];

  677.     ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];

  678.     for(i = 0; i < 4; i++)

  679.         last[i] = Y[i + Ystride * 3];

  680. }

  681. 

  682. static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)

  683. {

  684.     int i, j;

  685.     int bw, bh;

  686.     int type;

  687.     int keyframe = 1;

  688.     int *Y, *U, *V;

  689.     uint8_t *dst;

  690. 

  691.     bw = ctx->avctx->width >> 2;

  692.     bh = ctx->avctx->height >> 2;

  693. 

  694.     for(i = 0; i < TM2_NUM_STREAMS; i++)

  695.         ctx->tok_ptrs[i] = 0;

  696. 

  697.     if (ctx->tok_lens[TM2_TYPE]<bw*bh){

  698.         av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);

  699.         return -1;

  700.     }

  701. 

  702.     memset(ctx->last, 0, 4 * bw * sizeof(int));

  703.     memset(ctx->clast, 0, 4 * bw * sizeof(int));

  704. 

  705.     for(j = 0; j < bh; j++) {

  706.         memset(ctx->D, 0, 4 * sizeof(int));

  707.         memset(ctx->CD, 0, 4 * sizeof(int));

  708.         for(i = 0; i < bw; i++) {

  709.             type = GET_TOK(ctx, TM2_TYPE);

  710.             switch(type) {

  711.             case TM2_HI_RES:

  712.                 tm2_hi_res_block(ctx, p, i, j);

  713.                 break;

  714.             case TM2_MED_RES:

  715.                 tm2_med_res_block(ctx, p, i, j);

  716.                 break;

  717.             case TM2_LOW_RES:

  718.                 tm2_low_res_block(ctx, p, i, j);

  719.                 break;

  720.             case TM2_NULL_RES:

  721.                 tm2_null_res_block(ctx, p, i, j);

  722.                 break;

  723.             case TM2_UPDATE:

  724.                 tm2_update_block(ctx, p, i, j);

  725.                 keyframe = 0;

  726.                 break;

  727.             case TM2_STILL:

  728.                 tm2_still_block(ctx, p, i, j);

  729.                 keyframe = 0;

  730.                 break;

  731.             case TM2_MOTION:

  732.                 tm2_motion_block(ctx, p, i, j);

  733.                 keyframe = 0;

  734.                 break;

  735.             default:

  736.                 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);

  737.             }

  738.         }

  739.     }

  740. 

  741.     /* copy data from our buffer to AVFrame */

  742.     Y = (ctx->cur?ctx->Y2:ctx->Y1);

  743.     U = (ctx->cur?ctx->U2:ctx->U1);

  744.     V = (ctx->cur?ctx->V2:ctx->V1);

  745.     dst = p->data[0];

  746.     for(j = 0; j < ctx->avctx->height; j++){

  747.         for(i = 0; i < ctx->avctx->width; i++){

  748.             int y = Y[i], u = U[i >> 1], v = V[i >> 1];

  749.             dst[3*i+0] = av_clip_uint8(y + v);

  750.             dst[3*i+1] = av_clip_uint8(y);

  751.             dst[3*i+2] = av_clip_uint8(y + u);

  752.         }

  753.         Y += ctx->avctx->width;

  754.         if (j & 1) {

  755.             U += ctx->avctx->width >> 1;

  756.             V += ctx->avctx->width >> 1;

  757.         }

  758.         dst += p->linesize[0];

  759.     }

  760. 

  761.     return keyframe;

  762. }

  763. 

  764. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

  765.     TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE

  766. };

  767. 

  768. static int decode_frame(AVCodecContext *avctx,

  769.                         void *data, int *data_size,

  770.                         AVPacket *avpkt)

  771. {

  772.     const uint8_t *buf = avpkt->data;

  773.     int buf_size = avpkt->size;

  774.     TM2Context * const l = avctx->priv_data;

  775.     AVFrame * const p= (AVFrame*)&l->pic;

  776.     int i, skip, t;

  777.     uint8_t *swbuf;

  778. 

  779.     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  780.     if(!swbuf){

  781.         av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");

  782.         return -1;

  783.     }

  784.     p->reference = 1;

  785.     p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;

  786.     if(avctx->reget_buffer(avctx, p) < 0){

  787.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  788.         av_free(swbuf);

  789.         return -1;

  790.     }

  791. 

  792.     l->dsp.bswap_buf((uint32_t*)swbuf, (const uint32_t*)buf, buf_size >> 2);

  793.     skip = tm2_read_header(l, swbuf);

  794. 

  795.     if(skip == -1){

  796.         av_free(swbuf);

  797.         return -1;

  798.     }

  799. 

  800.     for(i = 0; i < TM2_NUM_STREAMS; i++){

  801.         t = tm2_read_stream(l, swbuf + skip, tm2_stream_order[i], buf_size);

  802.         if(t == -1){

  803.             av_free(swbuf);

  804.             return -1;

  805.         }

  806.         skip += t;

  807.     }

  808.     p->key_frame = tm2_decode_blocks(l, p);

  809.     if(p->key_frame)

  810.         p->pict_type = AV_PICTURE_TYPE_I;

  811.     else

  812.         p->pict_type = AV_PICTURE_TYPE_P;

  813. 

  814.     l->cur = !l->cur;

  815.     *data_size = sizeof(AVFrame);

  816.     *(AVFrame*)data = l->pic;

  817.     av_free(swbuf);

  818. 

  819.     return buf_size;

  820. }

  821. 

  822. static av_cold int decode_init(AVCodecContext *avctx){

  823.     TM2Context * const l = avctx->priv_data;

  824.     int i;

  825. 

  826.     if((avctx->width & 3) || (avctx->height & 3)){

  827.         av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");

  828.         return -1;

  829.     }

  830. 

  831.     l->avctx = avctx;

  832.     l->pic.data[0]=NULL;

  833.     avctx->pix_fmt = PIX_FMT_BGR24;

  834. 

  835.     dsputil_init(&l->dsp, avctx);

  836. 

  837.     l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));

  838.     l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));

  839. 

  840.     for(i = 0; i < TM2_NUM_STREAMS; i++) {

  841.         l->tokens[i] = NULL;

  842.         l->tok_lens[i] = 0;

  843.     }

  844. 

  845.     l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);

  846.     l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));

  847.     l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));

  848.     l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);

  849.     l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));

  850.     l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));

  851.     l->cur = 0;

  852. 

  853.     return 0;

  854. }

  855. 

  856. static av_cold int decode_end(AVCodecContext *avctx){

  857.     TM2Context * const l = avctx->priv_data;

  858.     AVFrame *pic = &l->pic;

  859.     int i;

  860. 

  861.     av_free(l->last);

  862.     av_free(l->clast);

  863.     for(i = 0; i < TM2_NUM_STREAMS; i++)

  864.         av_free(l->tokens[i]);

  865.     if(l->Y1){

  866.         av_free(l->Y1);

  867.         av_free(l->U1);

  868.         av_free(l->V1);

  869.         av_free(l->Y2);

  870.         av_free(l->U2);

  871.         av_free(l->V2);

  872.     }

  873. 

  874.     if (pic->data[0])

  875.         avctx->release_buffer(avctx, pic);

  876. 

  877.     return 0;

  878. }

  879. 

  880. AVCodec ff_truemotion2_decoder = {

  881.     "truemotion2",

  882.     AVMEDIA_TYPE_VIDEO,

  883.     CODEC_ID_TRUEMOTION2,

  884.     sizeof(TM2Context),

  885.     decode_init,

  886.     NULL,

  887.     decode_end,

  888.     decode_frame,

  889.     CODEC_CAP_DR1,

  890.     .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),

  891. };