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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 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. /**

  24.  * @file truemotion2.c

  25.  * Duck TrueMotion2 decoder.

  26.  */

  27. 

  28. #include "avcodec.h"

  29. #include "bitstream.h"

  30. #include "dsputil.h"

  31. 

  32. #define TM2_ESCAPE 0x80000000

  33. #define TM2_DELTAS 64

  34. /* Huffman-coded streams of different types of blocks */

  35. enum TM2_STREAMS{ TM2_C_HI = 0, TM2_C_LO, TM2_L_HI, TM2_L_LO,

  36.      TM2_UPD, TM2_MOT, TM2_TYPE, TM2_NUM_STREAMS};

  37. /* Block types */

  38. enum TM2_BLOCKS{ TM2_HI_RES = 0, TM2_MED_RES, TM2_LOW_RES, TM2_NULL_RES,

  39.                  TM2_UPDATE, TM2_STILL, TM2_MOTION};

  40. 

  41. typedef struct TM2Context{

  42.     AVCodecContext *avctx;

  43.     AVFrame pic;

  44. 

  45.     GetBitContext gb;

  46.     DSPContext dsp;

  47. 

  48.     /* TM2 streams */

  49.     int *tokens[TM2_NUM_STREAMS];

  50.     int tok_lens[TM2_NUM_STREAMS];

  51.     int tok_ptrs[TM2_NUM_STREAMS];

  52.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  53.     /* for blocks decoding */

  54.     int D[4];

  55.     int CD[4];

  56.     int *last;

  57.     int *clast;

  58. 

  59.     /* data for current and previous frame */

  60.     int *Y1, *U1, *V1, *Y2, *U2, *V2;

  61.     int cur;

  62. } TM2Context;

  63. 

  64. /**

  65. * Huffman codes for each of streams

  66. */

  67. typedef struct TM2Codes{

  68.     VLC vlc; ///< table for FFmpeg bitstream reader

  69.     int bits;

  70.     int *recode; ///< table for converting from code indexes to values

  71.     int length;

  72. } TM2Codes;

  73. 

  74. /**

  75. * structure for gathering Huffman codes information

  76. */

  77. typedef struct TM2Huff{

  78.     int val_bits; ///< length of literal

  79.     int max_bits; ///< maximum length of code

  80.     int min_bits; ///< minimum length of code

  81.     int nodes; ///< total number of nodes in tree

  82.     int num; ///< current number filled

  83.     int max_num; ///< total number of codes

  84.     int *nums; ///< literals

  85.     uint32_t *bits; ///< codes

  86.     int *lens; ///< codelengths

  87. } TM2Huff;

  88. 

  89. static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)

  90. {

  91.     if(length > huff->max_bits) {

  92.         av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n", huff->max_bits);

  93.         return -1;

  94.     }

  95. 

  96.     if(!get_bits1(&ctx->gb)) { /* literal */

  97.         if (length == 0) {

  98.             length = 1;

  99.         }

  100.         if(huff->num >= huff->max_num) {

  101.             av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");

  102.             return -1;

  103.         }

  104.         huff->nums[huff->num] = get_bits_long(&ctx->gb, huff->val_bits);

  105.         huff->bits[huff->num] = prefix;

  106.         huff->lens[huff->num] = length;

  107.         huff->num++;

  108.         return 0;

  109.     } else { /* non-terminal node */

  110.         if(tm2_read_tree(ctx, prefix << 1, length + 1, huff) == -1)

  111.             return -1;

  112.         if(tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff) == -1)

  113.             return -1;

  114.     }

  115.     return 0;

  116. }

  117. 

  118. static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)

  119. {

  120.     TM2Huff huff;

  121.     int res = 0;

  122. 

  123.     huff.val_bits = get_bits(&ctx->gb, 5);

  124.     huff.max_bits = get_bits(&ctx->gb, 5);

  125.     huff.min_bits = get_bits(&ctx->gb, 5);

  126.     huff.nodes = get_bits_long(&ctx->gb, 17);

  127.     huff.num = 0;

  128. 

  129.     /* check for correct codes parameters */

  130.     if((huff.val_bits < 1) || (huff.val_bits > 32) ||

  131.        (huff.max_bits < 0) || (huff.max_bits > 32)) {

  132.         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal length: %i, max code length: %i\n",

  133.                huff.val_bits, huff.max_bits);

  134.         return -1;

  135.     }

  136.     if((huff.nodes < 0) || (huff.nodes > 0x10000)) {

  137.         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree nodes: %i\n", huff.nodes);

  138.         return -1;

  139.     }

  140.     /* one-node tree */

  141.     if(huff.max_bits == 0)

  142.         huff.max_bits = 1;

  143. 

  144.     /* allocate space for codes - it is exactly ceil(nodes / 2) entries */

  145.     huff.max_num = (huff.nodes + 1) >> 1;

  146.     huff.nums = av_mallocz(huff.max_num * sizeof(int));

  147.     huff.bits = av_mallocz(huff.max_num * sizeof(uint32_t));

  148.     huff.lens = av_mallocz(huff.max_num * sizeof(int));

  149. 

  150.     if(tm2_read_tree(ctx, 0, 0, &huff) == -1)

  151.         res = -1;

  152. 

  153.     if(huff.num != huff.max_num) {

  154.         av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",

  155.                huff.num, huff.max_num);

  156.         res = -1;

  157.     }

  158. 

  159.     /* convert codes to vlc_table */

  160.     if(res != -1) {

  161.         int i;

  162. 

  163.         res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,

  164.                     huff.lens, sizeof(int), sizeof(int),

  165.                     huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);

  166.         if(res < 0) {

  167.             av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");

  168.             res = -1;

  169.         } else

  170.             res = 0;

  171.         if(res != -1) {

  172.             code->bits = huff.max_bits;

  173.             code->length = huff.max_num;

  174.             code->recode = av_malloc(code->length * sizeof(int));

  175.             for(i = 0; i < code->length; i++)

  176.                 code->recode[i] = huff.nums[i];

  177.         }

  178.     }

  179.     /* free allocated memory */

  180.     av_free(huff.nums);

  181.     av_free(huff.bits);

  182.     av_free(huff.lens);

  183. 

  184.     return res;

  185. }

  186. 

  187. static void tm2_free_codes(TM2Codes *code)

  188. {

  189.     if(code->recode)

  190.         av_free(code->recode);

  191.     if(code->vlc.table)

  192.         free_vlc(&code->vlc);

  193. }

  194. 

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

  196. {

  197.     int val;

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

  199.     return code->recode[val];

  200. }

  201. 

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

  203. {

  204.     uint32_t magic;

  205.     uint8_t *obuf;

  206.     int length;

  207. 

  208.     obuf = buf;

  209. 

  210.     magic = AV_RL32(buf);

  211.     buf += 4;

  212. 

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

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

  215.         return 40;

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

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

  218. 

  219.         length = AV_RL32(buf);

  220.         buf += 4;

  221. 

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

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

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

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

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

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

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

  229. 

  230.         return 40;

  231.     } else {

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

  233.         return -1;

  234.     }

  235. 

  236.     return (buf - obuf);

  237. }

  238. 

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

  240.     int d, mb;

  241.     int i, v;

  242. 

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

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

  245. 

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

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

  248.         return -1;

  249.     }

  250. 

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

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

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

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

  255.         else

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

  257.     }

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

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

  260. 

  261.     return 0;

  262. }

  263. 

  264. static int tm2_read_stream(TM2Context *ctx, uint8_t *buf, int stream_id) {

  265.     int i;

  266.     int cur = 0;

  267.     int skip = 0;

  268.     int len, toks;

  269.     TM2Codes codes;

  270. 

  271.     /* get stream length in dwords */

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

  273.     skip = len * 4 + 4;

  274. 

  275.     if(len == 0)

  276.         return 4;

  277. 

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

  279.     if(toks & 1) {

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

  281.         if(len == TM2_ESCAPE) {

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

  283.         }

  284.         if(len > 0) {

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

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

  287.                 return -1;

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

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

  290.         }

  291.     }

  292.     /* skip unused fields */

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

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

  295.     }

  296.     buf += 4; cur += 4;

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

  298. 

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

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

  301.         return -1;

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

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

  304. 

  305.     toks >>= 1;

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

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

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

  309.         tm2_free_codes(&codes);

  310.         return -1;

  311.     }

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

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

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

  315.     if(len > 0) {

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

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

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

  319.     } else {

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

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

  322.     }

  323.     tm2_free_codes(&codes);

  324. 

  325.     return skip;

  326. }

  327. 

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

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

  330.         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]);

  331.         return 0;

  332.     }

  333.     if(type <= TM2_MOT)

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

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

  336. }

  337. 

  338. /* blocks decoding routines */

  339. 

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

  341. #define TM2_INIT_POINTERS() \

  342.     int *last, *clast; \

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

  344.     int Ystride, Ustride, Vstride;\

  345. \

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

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

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

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

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

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

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

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

  354. 

  355. #define TM2_INIT_POINTERS_2() \

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

  357.     int oYstride, oUstride, oVstride;\

  358. \

  359.     TM2_INIT_POINTERS();\

  360.     oYstride = Ystride;\

  361.     oVstride = Vstride;\

  362.     oUstride = Ustride;\

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

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

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

  366. 

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

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

  369.     CD[0] = (CHR[1] - 128) - last[1];\

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

  371.     last[0] = (int)CHR[stride + 0] - 128;\

  372.     last[1] = (int)CHR[stride + 1] - 128;}

  373. 

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

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

  376. {

  377.     int ct, d;

  378.     int i, j;

  379. 

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

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

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

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

  384.             ct += d;

  385.             last[i] += ct;

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

  387.         }

  388.         Y += stride;

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

  390.     }

  391. }

  392. 

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

  394. {

  395.     int i, j;

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

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

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

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

  400.             data[i] = last[i] + 128;

  401.         }

  402.         data += stride;

  403.     }

  404. }

  405. 

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

  407. {

  408.     int t;

  409.     int l;

  410.     int prev;

  411. 

  412.     if(bx > 0)

  413.         prev = clast[-3];

  414.     else

  415.         prev = 0;

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

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

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

  419.     CD[0] = t;

  420.     clast[0] = l;

  421. 

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

  423. }

  424. 

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

  426. {

  427.     int i;

  428.     int deltas[16];

  429.     TM2_INIT_POINTERS();

  430. 

  431.     /* hi-res chroma */

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

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

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

  435.     }

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

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

  438. 

  439.     /* hi-res luma */

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

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

  442. 

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

  444. }

  445. 

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

  447. {

  448.     int i;

  449.     int deltas[16];

  450.     TM2_INIT_POINTERS();

  451. 

  452.     /* low-res chroma */

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

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

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

  456. 

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

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

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

  460. 

  461.     /* hi-res luma */

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

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

  464. 

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

  466. }

  467. 

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

  469. {

  470.     int i;

  471.     int t1, t2;

  472.     int deltas[16];

  473.     TM2_INIT_POINTERS();

  474. 

  475.     /* low-res chroma */

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

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

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

  479. 

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

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

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

  483. 

  484.     /* low-res luma */

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

  486.         deltas[i] = 0;

  487. 

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

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

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

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

  492. 

  493.     if(bx > 0)

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

  495.     else

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

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

  498. 

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

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

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

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

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

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

  505. 

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

  507. }

  508. 

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

  510. {

  511.     int i;

  512.     int ct;

  513.     int left, right, diff;

  514.     int deltas[16];

  515.     TM2_INIT_POINTERS();

  516. 

  517.     /* null chroma */

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

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

  520. 

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

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

  523. 

  524.     /* null luma */

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

  526.         deltas[i] = 0;

  527. 

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

  529. 

  530.     if(bx > 0)

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

  532.     else

  533.         left = 0;

  534. 

  535.     right = last[3];

  536.     diff = right - left;

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

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

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

  540.     last[3] = right;

  541.     {

  542.         int tp = left;

  543. 

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

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

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

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

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

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

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

  551.     }

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

  553. }

  554. 

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

  556. {

  557.     int i, j;

  558.     TM2_INIT_POINTERS_2();

  559. 

  560.     /* update chroma */

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

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

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

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

  565.         }

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

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

  568.     }

  569.     U -= Ustride * 2;

  570.     V -= Vstride * 2;

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

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

  573. 

  574.     /* update deltas */

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

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

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

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

  579. 

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

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

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

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

  584.         }

  585.         Y += Ystride;

  586.         Yo += oYstride;

  587.     }

  588. }

  589. 

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

  591. {

  592.     int i, j;

  593.     int d;

  594.     TM2_INIT_POINTERS_2();

  595. 

  596.     /* update chroma */

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

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

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

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

  601.         }

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

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

  604.     }

  605.     U -= Ustride * 2;

  606.     V -= Vstride * 2;

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

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

  609. 

  610.     /* update deltas */

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

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

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

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

  615. 

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

  617.         d = last[3];

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

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

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

  621.         }

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

  623.         Y += Ystride;

  624.         Yo += oYstride;

  625.     }

  626. }

  627. 

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

  629. {

  630.     int i, j;

  631.     int mx, my;

  632.     TM2_INIT_POINTERS_2();

  633. 

  634.     mx = GET_TOK(ctx, TM2_MOT);

  635.     my = GET_TOK(ctx, TM2_MOT);

  636. 

  637.     Yo += my * oYstride + mx;

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

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

  640. 

  641.     /* copy chroma */

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

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

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

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

  646.         }

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

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

  649.     }

  650.     U -= Ustride * 2;

  651.     V -= Vstride * 2;

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

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

  654. 

  655.     /* copy luma */

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

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

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

  659.         }

  660.         Y += Ystride;

  661.         Yo += oYstride;

  662.     }

  663.     /* calculate deltas */

  664.     Y -= Ystride * 4;

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

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

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

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

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

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

  671. }

  672. 

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

  674. {

  675.     int i, j;

  676.     int bw, bh;

  677.     int type;

  678.     int keyframe = 1;

  679.     uint8_t *Y, *U, *V;

  680.     int *src;

  681. 

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

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

  684. 

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

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

  687. 

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

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

  690.         return -1;

  691.     }

  692. 

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

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

  695. 

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

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

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

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

  700.             type = GET_TOK(ctx, TM2_TYPE);

  701.             switch(type) {

  702.             case TM2_HI_RES:

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

  704.                 break;

  705.             case TM2_MED_RES:

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

  707.                 break;

  708.             case TM2_LOW_RES:

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

  710.                 break;

  711.             case TM2_NULL_RES:

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

  713.                 break;

  714.             case TM2_UPDATE:

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

  716.                 keyframe = 0;

  717.                 break;

  718.             case TM2_STILL:

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

  720.                 keyframe = 0;

  721.                 break;

  722.             case TM2_MOTION:

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

  724.                 keyframe = 0;

  725.                 break;

  726.             default:

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

  728.             }

  729.         }

  730.     }

  731. 

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

  733.     Y = p->data[0];

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

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

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

  737.             Y[i] = av_clip_uint8(*src++);

  738.         }

  739.         Y += p->linesize[0];

  740.     }

  741.     U = p->data[2];

  742.     src = (ctx->cur?ctx->U2:ctx->U1);

  743.     for(j = 0; j < (ctx->avctx->height + 1) >> 1; j++){

  744.         for(i = 0; i < (ctx->avctx->width + 1) >> 1; i++){

  745.             U[i] = av_clip_uint8(*src++);

  746.         }

  747.         U += p->linesize[2];

  748.     }

  749.     V = p->data[1];

  750.     src = (ctx->cur?ctx->V2:ctx->V1);

  751.     for(j = 0; j < (ctx->avctx->height + 1) >> 1; j++){

  752.         for(i = 0; i < (ctx->avctx->width + 1) >> 1; i++){

  753.             V[i] = av_clip_uint8(*src++);

  754.         }

  755.         V += p->linesize[1];

  756.     }

  757. 

  758.     return keyframe;

  759. }

  760. 

  761. static int decode_frame(AVCodecContext *avctx,

  762.                         void *data, int *data_size,

  763.                         uint8_t *buf, int buf_size)

  764. {

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

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

  767.     int skip, t;

  768. 

  769.     p->reference = 1;

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

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

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

  773.         return -1;

  774.     }

  775. 

  776.     l->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, buf_size >> 2);

  777.     skip = tm2_read_header(l, buf);

  778. 

  779.     if(skip == -1)

  780.         return -1;

  781. 

  782.     t = tm2_read_stream(l, buf + skip, TM2_C_HI);

  783.     if(t == -1)

  784.         return -1;

  785.     skip += t;

  786.     t = tm2_read_stream(l, buf + skip, TM2_C_LO);

  787.     if(t == -1)

  788.         return -1;

  789.     skip += t;

  790.     t = tm2_read_stream(l, buf + skip, TM2_L_HI);

  791.     if(t == -1)

  792.         return -1;

  793.     skip += t;

  794.     t = tm2_read_stream(l, buf + skip, TM2_L_LO);

  795.     if(t == -1)

  796.         return -1;

  797.     skip += t;

  798.     t = tm2_read_stream(l, buf + skip, TM2_UPD);

  799.     if(t == -1)

  800.         return -1;

  801.     skip += t;

  802.     t = tm2_read_stream(l, buf + skip, TM2_MOT);

  803.     if(t == -1)

  804.         return -1;

  805.     skip += t;

  806.     t = tm2_read_stream(l, buf + skip, TM2_TYPE);

  807.     if(t == -1)

  808.         return -1;

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

  810.     if(p->key_frame)

  811.         p->pict_type = FF_I_TYPE;

  812.     else

  813.         p->pict_type = FF_P_TYPE;

  814. 

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

  816.     *data_size = sizeof(AVFrame);

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

  818. 

  819.     return buf_size;

  820. }

  821. 

  822. static int decode_init(AVCodecContext *avctx){

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

  824.     int i;

  825. 

  826.     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {

  827.         return -1;

  828.     }

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

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

  831.         return -1;

  832.     }

  833. 

  834.     l->avctx = avctx;

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

  836.     avctx->pix_fmt = PIX_FMT_YUV420P;

  837. 

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

  839. 

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

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

  842. 

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

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

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

  846.     }

  847. 

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

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

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

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

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

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

  854.     l->cur = 0;

  855. 

  856.     return 0;

  857. }

  858. 

  859. static int decode_end(AVCodecContext *avctx){

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

  861.     int i;

  862. 

  863.     if(l->last)

  864.         av_free(l->last);

  865.     if(l->clast)

  866.         av_free(l->clast);

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

  868.         if(l->tokens[i])

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

  870.     if(l->Y1){

  871.         av_free(l->Y1);

  872.         av_free(l->U1);

  873.         av_free(l->V1);

  874.         av_free(l->Y2);

  875.         av_free(l->U2);

  876.         av_free(l->V2);

  877.     }

  878.     return 0;

  879. }

  880. 

  881. AVCodec truemotion2_decoder = {

  882.     "truemotion2",

  883.     CODEC_TYPE_VIDEO,

  884.     CODEC_ID_TRUEMOTION2,

  885.     sizeof(TM2Context),

  886.     decode_init,

  887.     NULL,

  888.     decode_end,

  889.     decode_frame,

  890.     CODEC_CAP_DR1,

  891. };