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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. 

  205.     obuf = buf;

  206. 

  207.     magic = AV_RL32(buf);

  208.     buf += 4;

  209. 

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

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

  212.         return 40;

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

  214.         return 40;

  215.     } else {

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

  217.         return -1;

  218.     }

  219. 

  220.     return buf - obuf;

  221. }

  222. 

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

  224.     int d, mb;

  225.     int i, v;

  226. 

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

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

  229. 

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

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

  232.         return -1;

  233.     }

  234. 

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

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

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

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

  239.         else

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

  241.     }

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

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

  244. 

  245.     return 0;

  246. }

  247. 

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

  249. {

  250.     int i;

  251.     int cur = 0;

  252.     int skip = 0;

  253.     int len, toks;

  254.     TM2Codes codes;

  255. 

  256.     /* get stream length in dwords */

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

  258.     skip = len * 4 + 4;

  259. 

  260.     if(len == 0)

  261.         return 4;

  262. 

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

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

  265.         return -1;

  266.     }

  267. 

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

  269.     if(toks & 1) {

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

  271.         if(len == TM2_ESCAPE) {

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

  273.         }

  274.         if(len > 0) {

  275.             if (skip <= cur)

  276.                 return -1;

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

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

  279.                 return -1;

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

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

  282.         }

  283.     }

  284.     /* skip unused fields */

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

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

  287.     }

  288.     buf += 4; cur += 4;

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

  290. 

  291.     if (skip <= cur)

  292.         return -1;

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

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

  295.         return -1;

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

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

  298. 

  299.     toks >>= 1;

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

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

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

  303.         tm2_free_codes(&codes);

  304.         return -1;

  305.     }

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

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

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

  309.     if(len > 0) {

  310.         if (skip <= cur)

  311.             return -1;

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

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

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

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

  316.                 return -1;

  317.             }

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

  319.         }

  320.     } else {

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

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

  323.     }

  324.     tm2_free_codes(&codes);

  325. 

  326.     return skip;

  327. }

  328. 

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

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

  331.         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]);

  332.         return 0;

  333.     }

  334.     if(type <= TM2_MOT)

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

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

  337. }

  338. 

  339. /* blocks decoding routines */

  340. 

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

  342. #define TM2_INIT_POINTERS() \

  343.     int *last, *clast; \

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

  345.     int Ystride, Ustride, Vstride;\

  346. \

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

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

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

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

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

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

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

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

  355. 

  356. #define TM2_INIT_POINTERS_2() \

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

  358.     int oYstride, oUstride, oVstride;\

  359. \

  360.     TM2_INIT_POINTERS();\

  361.     oYstride = Ystride;\

  362.     oVstride = Vstride;\

  363.     oUstride = Ustride;\

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

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

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

  367. 

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

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

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

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

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

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

  374. 

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

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

  377. {

  378.     int ct, d;

  379.     int i, j;

  380. 

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

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

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

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

  385.             ct += d;

  386.             last[i] += ct;

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

  388.         }

  389.         Y += stride;

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

  391.     }

  392. }

  393. 

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

  395. {

  396.     int i, j;

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

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

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

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

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

  402.         }

  403.         data += stride;

  404.     }

  405. }

  406. 

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

  408. {

  409.     int t;

  410.     int l;

  411.     int prev;

  412. 

  413.     if(bx > 0)

  414.         prev = clast[-3];

  415.     else

  416.         prev = 0;

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

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

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

  420.     CD[0] = t;

  421.     clast[0] = l;

  422. 

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

  424. }

  425. 

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

  427. {

  428.     int i;

  429.     int deltas[16];

  430.     TM2_INIT_POINTERS();

  431. 

  432.     /* hi-res chroma */

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

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

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

  436.     }

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

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

  439. 

  440.     /* hi-res luma */

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

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

  443. 

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

  445. }

  446. 

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

  448. {

  449.     int i;

  450.     int deltas[16];

  451.     TM2_INIT_POINTERS();

  452. 

  453.     /* low-res chroma */

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

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

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

  457. 

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

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

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

  461. 

  462.     /* hi-res luma */

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

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

  465. 

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

  467. }

  468. 

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

  470. {

  471.     int i;

  472.     int t1, t2;

  473.     int deltas[16];

  474.     TM2_INIT_POINTERS();

  475. 

  476.     /* low-res chroma */

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

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

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

  480. 

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

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

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

  484. 

  485.     /* low-res luma */

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

  487.         deltas[i] = 0;

  488. 

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

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

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

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

  493. 

  494.     if(bx > 0)

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

  496.     else

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

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

  499. 

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

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

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

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

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

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

  506. 

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

  508. }

  509. 

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

  511. {

  512.     int i;

  513.     int ct;

  514.     int left, right, diff;

  515.     int deltas[16];

  516.     TM2_INIT_POINTERS();

  517. 

  518.     /* null chroma */

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

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

  521. 

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

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

  524. 

  525.     /* null luma */

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

  527.         deltas[i] = 0;

  528. 

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

  530. 

  531.     if(bx > 0)

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

  533.     else

  534.         left = 0;

  535. 

  536.     right = last[3];

  537.     diff = right - left;

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

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

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

  541.     last[3] = right;

  542.     {

  543.         int tp = left;

  544. 

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

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

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

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

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

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

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

  552.     }

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

  554. }

  555. 

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

  557. {

  558.     int i, j;

  559.     TM2_INIT_POINTERS_2();

  560. 

  561.     /* update chroma */

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

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

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

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

  566.         }

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

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

  569.     }

  570.     U -= Ustride * 2;

  571.     V -= Vstride * 2;

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

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

  574. 

  575.     /* update deltas */

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

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

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

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

  580. 

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

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

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

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

  585.         }

  586.         Y += Ystride;

  587.         Yo += oYstride;

  588.     }

  589. }

  590. 

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

  592. {

  593.     int i, j;

  594.     int d;

  595.     TM2_INIT_POINTERS_2();

  596. 

  597.     /* update chroma */

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

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

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

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

  602.         }

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

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

  605.     }

  606.     U -= Ustride * 2;

  607.     V -= Vstride * 2;

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

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

  610. 

  611.     /* update deltas */

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

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

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

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

  616. 

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

  618.         d = last[3];

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

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

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

  622.         }

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

  624.         Y += Ystride;

  625.         Yo += oYstride;

  626.     }

  627. }

  628. 

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

  630. {

  631.     int i, j;

  632.     int mx, my;

  633.     TM2_INIT_POINTERS_2();

  634. 

  635.     mx = GET_TOK(ctx, TM2_MOT);

  636.     my = GET_TOK(ctx, TM2_MOT);

  637. 

  638.     Yo += my * oYstride + mx;

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

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

  641. 

  642.     /* copy chroma */

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

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

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

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

  647.         }

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

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

  650.     }

  651.     U -= Ustride * 2;

  652.     V -= Vstride * 2;

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

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

  655. 

  656.     /* copy luma */

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

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

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

  660.         }

  661.         Y += Ystride;

  662.         Yo += oYstride;

  663.     }

  664.     /* calculate deltas */

  665.     Y -= Ystride * 4;

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

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

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

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

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

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

  672. }

  673. 

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

  675. {

  676.     int i, j;

  677.     int bw, bh;

  678.     int type;

  679.     int keyframe = 1;

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

  681.     uint8_t *dst;

  682. 

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

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

  685. 

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

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

  688. 

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

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

  691.         return -1;

  692.     }

  693. 

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

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

  696. 

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

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

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

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

  701.             type = GET_TOK(ctx, TM2_TYPE);

  702.             switch(type) {

  703.             case TM2_HI_RES:

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

  705.                 break;

  706.             case TM2_MED_RES:

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

  708.                 break;

  709.             case TM2_LOW_RES:

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

  711.                 break;

  712.             case TM2_NULL_RES:

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

  714.                 break;

  715.             case TM2_UPDATE:

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

  717.                 keyframe = 0;

  718.                 break;

  719.             case TM2_STILL:

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

  721.                 keyframe = 0;

  722.                 break;

  723.             case TM2_MOTION:

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

  725.                 keyframe = 0;

  726.                 break;

  727.             default:

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

  729.             }

  730.         }

  731.     }

  732. 

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

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

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

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

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

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

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

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

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

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

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

  744.         }

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

  746.         if (j & 1) {

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

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

  749.         }

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

  751.     }

  752. 

  753.     return keyframe;

  754. }

  755. 

  756. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  758. };

  759. 

  760. static int decode_frame(AVCodecContext *avctx,

  761.                         void *data, int *data_size,

  762.                         AVPacket *avpkt)

  763. {

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

  765.     int buf_size = avpkt->size;

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

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

  768.     int i, skip, t;

  769.     uint8_t *swbuf;

  770. 

  771.     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  772.     if(!swbuf){

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

  774.         return -1;

  775.     }

  776.     p->reference = 1;

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

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

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

  780.         av_free(swbuf);

  781.         return -1;

  782.     }

  783. 

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

  785.     skip = tm2_read_header(l, swbuf);

  786. 

  787.     if(skip == -1){

  788.         av_free(swbuf);

  789.         return -1;

  790.     }

  791. 

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

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

  794.         if(t == -1){

  795.             av_free(swbuf);

  796.             return -1;

  797.         }

  798.         skip += t;

  799.     }

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

  801.     if(p->key_frame)

  802.         p->pict_type = AV_PICTURE_TYPE_I;

  803.     else

  804.         p->pict_type = AV_PICTURE_TYPE_P;

  805. 

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

  807.     *data_size = sizeof(AVFrame);

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

  809.     av_free(swbuf);

  810. 

  811.     return buf_size;

  812. }

  813. 

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

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

  816.     int i;

  817. 

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

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

  820.         return -1;

  821.     }

  822. 

  823.     l->avctx = avctx;

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

  825.     avctx->pix_fmt = PIX_FMT_BGR24;

  826. 

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

  828. 

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

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

  831. 

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

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

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

  835.     }

  836. 

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

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

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

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

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

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

  843.     l->cur = 0;

  844. 

  845.     return 0;

  846. }

  847. 

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

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

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

  851.     int i;

  852. 

  853.     av_free(l->last);

  854.     av_free(l->clast);

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

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

  857.     if(l->Y1){

  858.         av_free(l->Y1);

  859.         av_free(l->U1);

  860.         av_free(l->V1);

  861.         av_free(l->Y2);

  862.         av_free(l->U2);

  863.         av_free(l->V2);

  864.     }

  865. 

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

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

  868. 

  869.     return 0;

  870. }

  871. 

  872. AVCodec ff_truemotion2_decoder = {

  873.     .name           = "truemotion2",

  874.     .type           = AVMEDIA_TYPE_VIDEO,

  875.     .id             = CODEC_ID_TRUEMOTION2,

  876.     .priv_data_size = sizeof(TM2Context),

  877.     .init           = decode_init,

  878.     .close          = decode_end,

  879.     .decode         = decode_frame,

  880.     .capabilities   = CODEC_CAP_DR1,

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

  882. };