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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 "bytestream.h"

  29. #include "get_bits.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_base, *U1_base, *V1_base, *Y2_base, *U2_base, *V2_base;

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

  62.     int y_stride, uv_stride;

  63.     int cur;

  64. } TM2Context;

  65. 

  66. /**

  67. * Huffman codes for each of streams

  68. */

  69. typedef struct TM2Codes{

  70.     VLC vlc; ///< table for Libav bitstream reader

  71.     int bits;

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

  73.     int length;

  74. } TM2Codes;

  75. 

  76. /**

  77. * structure for gathering Huffman codes information

  78. */

  79. typedef struct TM2Huff{

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

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

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

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

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

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

  86.     int *nums; ///< literals

  87.     uint32_t *bits; ///< codes

  88.     int *lens; ///< codelengths

  89. } TM2Huff;

  90. 

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

  92. {

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

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

  95.         return -1;

  96.     }

  97. 

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

  99.         if (length == 0) {

  100.             length = 1;

  101.         }

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

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

  104.             return -1;

  105.         }

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

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

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

  109.         huff->num++;

  110.         return 0;

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

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

  113.             return -1;

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

  115.             return -1;

  116.     }

  117.     return 0;

  118. }

  119. 

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

  121. {

  122.     TM2Huff huff;

  123.     int res = 0;

  124. 

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

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

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

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

  129.     huff.num = 0;

  130. 

  131.     /* check for correct codes parameters */

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

  133.        (huff.max_bits < 0) || (huff.max_bits > 25)) {

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

  135.                huff.val_bits, huff.max_bits);

  136.         return -1;

  137.     }

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

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

  140.         return -1;

  141.     }

  142.     /* one-node tree */

  143.     if(huff.max_bits == 0)

  144.         huff.max_bits = 1;

  145. 

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

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

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

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

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

  151. 

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

  153.         res = -1;

  154. 

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

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

  157.                huff.num, huff.max_num);

  158.         res = -1;

  159.     }

  160. 

  161.     /* convert codes to vlc_table */

  162.     if(res != -1) {

  163.         int i;

  164. 

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

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

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

  168.         if(res < 0) {

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

  170.             res = -1;

  171.         } else

  172.             res = 0;

  173.         if(res != -1) {

  174.             code->bits = huff.max_bits;

  175.             code->length = huff.max_num;

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

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

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

  179.         }

  180.     }

  181.     /* free allocated memory */

  182.     av_free(huff.nums);

  183.     av_free(huff.bits);

  184.     av_free(huff.lens);

  185. 

  186.     return res;

  187. }

  188. 

  189. static void tm2_free_codes(TM2Codes *code)

  190. {

  191.     av_free(code->recode);

  192.     if(code->vlc.table)

  193.         ff_free_vlc(&code->vlc);

  194. }

  195. 

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

  197. {

  198.     int val;

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

  200.     return code->recode[val];

  201. }

  202. 

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

  204. {

  205.     uint32_t magic;

  206.     const uint8_t *obuf;

  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.         return 40;

  218.     } else {

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

  220.         return -1;

  221.     }

  222. 

  223.     return buf - obuf;

  224. }

  225. 

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

  227.     int d, mb;

  228.     int i, v;

  229. 

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

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

  232. 

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

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

  235.         return -1;

  236.     }

  237. 

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

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

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

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

  242.         else

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

  244.     }

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

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

  247. 

  248.     return 0;

  249. }

  250. 

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

  252. {

  253.     int i;

  254.     int skip = 0;

  255.     int len, toks, pos;

  256.     TM2Codes codes;

  257.     GetByteContext gb;

  258. 

  259.     /* get stream length in dwords */

  260.     bytestream2_init(&gb, buf, buf_size);

  261.     len  = bytestream2_get_be32(&gb);

  262.     skip = len * 4 + 4;

  263. 

  264.     if(len == 0)

  265.         return 4;

  266. 

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

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

  269.         return -1;

  270.     }

  271. 

  272.     toks = bytestream2_get_be32(&gb);

  273.     if(toks & 1) {

  274.         len = bytestream2_get_be32(&gb);

  275.         if(len == TM2_ESCAPE) {

  276.             len = bytestream2_get_be32(&gb);

  277.         }

  278.         if(len > 0) {

  279.             pos = bytestream2_tell(&gb);

  280.             if (skip <= pos)

  281.                 return -1;

  282.             init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);

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

  284.                 return -1;

  285.             bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);

  286.         }

  287.     }

  288.     /* skip unused fields */

  289.     len = bytestream2_get_be32(&gb);

  290.     if(len == TM2_ESCAPE) { /* some unknown length - could be escaped too */

  291.         bytestream2_skip(&gb, 8); /* unused by decoder */

  292.     } else {

  293.         bytestream2_skip(&gb, 4); /* unused by decoder */

  294.     }

  295. 

  296.     pos = bytestream2_tell(&gb);

  297.     if (skip <= pos)

  298.         return -1;

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

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

  301.         return -1;

  302.     bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);

  303. 

  304.     toks >>= 1;

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

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

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

  308.         tm2_free_codes(&codes);

  309.         return -1;

  310.     }

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

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

  313.     len = bytestream2_get_be32(&gb);

  314.     if(len > 0) {

  315.         pos = bytestream2_tell(&gb);

  316.         if (skip <= pos)

  317.             return -1;

  318.         init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);

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

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

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

  322.                 return -1;

  323.             }

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

  325.             if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {

  326.                 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",

  327.                        ctx->tokens[stream_id][i], stream_id, i);

  328.                 return AVERROR_INVALIDDATA;

  329.             }

  330.         }

  331.     } else {

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

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

  334.             if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {

  335.                 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",

  336.                        ctx->tokens[stream_id][i], stream_id, i);

  337.                 return AVERROR_INVALIDDATA;

  338.             }

  339.         }

  340.     }

  341.     tm2_free_codes(&codes);

  342. 

  343.     return skip;

  344. }

  345. 

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

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

  348.         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]);

  349.         return 0;

  350.     }

  351.     if(type <= TM2_MOT)

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

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

  354. }

  355. 

  356. /* blocks decoding routines */

  357. 

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

  359. #define TM2_INIT_POINTERS() \

  360.     int *last, *clast; \

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

  362.     int Ystride, Ustride, Vstride;\

  363. \

  364.     Ystride = ctx->y_stride;\

  365.     Vstride = ctx->uv_stride;\

  366.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  372. 

  373. #define TM2_INIT_POINTERS_2() \

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

  375.     int oYstride, oUstride, oVstride;\

  376. \

  377.     TM2_INIT_POINTERS();\

  378.     oYstride = Ystride;\

  379.     oVstride = Vstride;\

  380.     oUstride = Ustride;\

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

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

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

  384. 

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

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

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

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

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

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

  391. 

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

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

  394. {

  395.     int ct, d;

  396.     int i, j;

  397. 

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

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

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

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

  402.             ct += d;

  403.             last[i] += ct;

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

  405.         }

  406.         Y += stride;

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

  408.     }

  409. }

  410. 

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

  412. {

  413.     int i, j;

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

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

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

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

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

  419.         }

  420.         data += stride;

  421.     }

  422. }

  423. 

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

  425. {

  426.     int t;

  427.     int l;

  428.     int prev;

  429. 

  430.     if(bx > 0)

  431.         prev = clast[-3];

  432.     else

  433.         prev = 0;

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

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

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

  437.     CD[0] = t;

  438.     clast[0] = l;

  439. 

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

  441. }

  442. 

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

  444. {

  445.     int i;

  446.     int deltas[16];

  447.     TM2_INIT_POINTERS();

  448. 

  449.     /* hi-res chroma */

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

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

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

  453.     }

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

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

  456. 

  457.     /* hi-res luma */

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

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

  460. 

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

  462. }

  463. 

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

  465. {

  466.     int i;

  467.     int deltas[16];

  468.     TM2_INIT_POINTERS();

  469. 

  470.     /* low-res chroma */

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

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

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

  474. 

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

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

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

  478. 

  479.     /* hi-res luma */

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

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

  482. 

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

  484. }

  485. 

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

  487. {

  488.     int i;

  489.     int t1, t2;

  490.     int deltas[16];

  491.     TM2_INIT_POINTERS();

  492. 

  493.     /* low-res chroma */

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

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

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

  497. 

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

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

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

  501. 

  502.     /* low-res luma */

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

  504.         deltas[i] = 0;

  505. 

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

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

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

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

  510. 

  511.     if(bx > 0)

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

  513.     else

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

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

  516. 

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

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

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

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

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

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

  523. 

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

  525. }

  526. 

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

  528. {

  529.     int i;

  530.     int ct;

  531.     int left, right, diff;

  532.     int deltas[16];

  533.     TM2_INIT_POINTERS();

  534. 

  535.     /* null chroma */

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

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

  538. 

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

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

  541. 

  542.     /* null luma */

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

  544.         deltas[i] = 0;

  545. 

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

  547. 

  548.     if(bx > 0)

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

  550.     else

  551.         left = 0;

  552. 

  553.     right = last[3];

  554.     diff = right - left;

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

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

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

  558.     last[3] = right;

  559.     {

  560.         int tp = left;

  561. 

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

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

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

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

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

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

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

  569.     }

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

  571. }

  572. 

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

  574. {

  575.     int i, j;

  576.     TM2_INIT_POINTERS_2();

  577. 

  578.     /* update chroma */

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

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

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

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

  583.         }

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

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

  586.     }

  587.     U -= Ustride * 2;

  588.     V -= Vstride * 2;

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

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

  591. 

  592.     /* update deltas */

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

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

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

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

  597. 

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

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

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

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

  602.         }

  603.         Y += Ystride;

  604.         Yo += oYstride;

  605.     }

  606. }

  607. 

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

  609. {

  610.     int i, j;

  611.     int d;

  612.     TM2_INIT_POINTERS_2();

  613. 

  614.     /* update chroma */

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

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

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

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

  619.         }

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

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

  622.     }

  623.     U -= Ustride * 2;

  624.     V -= Vstride * 2;

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

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

  627. 

  628.     /* update deltas */

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

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

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

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

  633. 

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

  635.         d = last[3];

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

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

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

  639.         }

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

  641.         Y += Ystride;

  642.         Yo += oYstride;

  643.     }

  644. }

  645. 

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

  647. {

  648.     int i, j;

  649.     int mx, my;

  650.     TM2_INIT_POINTERS_2();

  651. 

  652.     mx = GET_TOK(ctx, TM2_MOT);

  653.     my = GET_TOK(ctx, TM2_MOT);

  654.     mx = av_clip(mx, -(bx * 4 + 4), ctx->avctx->width  - bx * 4);

  655.     my = av_clip(my, -(by * 4 + 4), ctx->avctx->height - by * 4);

  656. 

  657.     Yo += my * oYstride + mx;

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

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

  660. 

  661.     /* copy chroma */

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

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

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

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

  666.         }

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

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

  669.     }

  670.     U -= Ustride * 2;

  671.     V -= Vstride * 2;

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

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

  674. 

  675.     /* copy luma */

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

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

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

  679.         }

  680.         Y += Ystride;

  681.         Yo += oYstride;

  682.     }

  683.     /* calculate deltas */

  684.     Y -= Ystride * 4;

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

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

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

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

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

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

  691. }

  692. 

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

  694. {

  695.     int i, j;

  696.     int w = ctx->avctx->width, h = ctx->avctx->height, bw = w >> 2, bh = h >> 2, cw = w >> 1;

  697.     int type;

  698.     int keyframe = 1;

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

  700.     uint8_t *dst;

  701. 

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

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

  704. 

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

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

  707.         return -1;

  708.     }

  709. 

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

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

  712. 

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

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

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

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

  717.             type = GET_TOK(ctx, TM2_TYPE);

  718.             switch(type) {

  719.             case TM2_HI_RES:

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

  721.                 break;

  722.             case TM2_MED_RES:

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

  724.                 break;

  725.             case TM2_LOW_RES:

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

  727.                 break;

  728.             case TM2_NULL_RES:

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

  730.                 break;

  731.             case TM2_UPDATE:

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

  733.                 keyframe = 0;

  734.                 break;

  735.             case TM2_STILL:

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

  737.                 keyframe = 0;

  738.                 break;

  739.             case TM2_MOTION:

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

  741.                 keyframe = 0;

  742.                 break;

  743.             default:

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

  745.             }

  746.         }

  747.     }

  748. 

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

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

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

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

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

  754.     for(j = 0; j < h; j++){

  755.         for(i = 0; i < w; i++){

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

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

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

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

  760.         }

  761. 

  762.         /* horizontal edge extension */

  763.         Y[-4]    = Y[-3]    = Y[-2]    = Y[-1] = Y[0];

  764.         Y[w + 3] = Y[w + 2] = Y[w + 1] = Y[w]  = Y[w - 1];

  765. 

  766.         /* vertical edge extension */

  767.         if (j == 0) {

  768.             memcpy(Y - 4 - 1 * ctx->y_stride, Y - 4, ctx->y_stride);

  769.             memcpy(Y - 4 - 2 * ctx->y_stride, Y - 4, ctx->y_stride);

  770.             memcpy(Y - 4 - 3 * ctx->y_stride, Y - 4, ctx->y_stride);

  771.             memcpy(Y - 4 - 4 * ctx->y_stride, Y - 4, ctx->y_stride);

  772.         } else if (j == h - 1) {

  773.             memcpy(Y - 4 + 1 * ctx->y_stride, Y - 4, ctx->y_stride);

  774.             memcpy(Y - 4 + 2 * ctx->y_stride, Y - 4, ctx->y_stride);

  775.             memcpy(Y - 4 + 3 * ctx->y_stride, Y - 4, ctx->y_stride);

  776.             memcpy(Y - 4 + 4 * ctx->y_stride, Y - 4, ctx->y_stride);

  777.         }

  778. 

  779.         Y += ctx->y_stride;

  780.         if (j & 1) {

  781.             /* horizontal edge extension */

  782.             U[-2]     = U[-1] = U[0];

  783.             V[-2]     = V[-1] = V[0];

  784.             U[cw + 1] = U[cw] = U[cw - 1];

  785.             V[cw + 1] = V[cw] = V[cw - 1];

  786. 

  787.             /* vertical edge extension */

  788.             if (j == 1) {

  789.                 memcpy(U - 2 - 1 * ctx->uv_stride, U - 2, ctx->uv_stride);

  790.                 memcpy(V - 2 - 1 * ctx->uv_stride, V - 2, ctx->uv_stride);

  791.                 memcpy(U - 2 - 2 * ctx->uv_stride, U - 2, ctx->uv_stride);

  792.                 memcpy(V - 2 - 2 * ctx->uv_stride, V - 2, ctx->uv_stride);

  793.             } else if (j == h - 1) {

  794.                 memcpy(U - 2 + 1 * ctx->uv_stride, U - 2, ctx->uv_stride);

  795.                 memcpy(V - 2 + 1 * ctx->uv_stride, V - 2, ctx->uv_stride);

  796.                 memcpy(U - 2 + 2 * ctx->uv_stride, U - 2, ctx->uv_stride);

  797.                 memcpy(V - 2 + 2 * ctx->uv_stride, V - 2, ctx->uv_stride);

  798.             }

  799. 

  800.             U += ctx->uv_stride;

  801.             V += ctx->uv_stride;

  802.         }

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

  804.     }

  805. 

  806.     return keyframe;

  807. }

  808. 

  809. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  811. };

  812. 

  813. static int decode_frame(AVCodecContext *avctx,

  814.                         void *data, int *data_size,

  815.                         AVPacket *avpkt)

  816. {

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

  818.     int buf_size = avpkt->size & ~3;

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

  820.     AVFrame * const p = &l->pic;

  821.     int i, skip, t;

  822.     uint8_t *swbuf;

  823. 

  824.     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  825.     if(!swbuf){

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

  827.         return -1;

  828.     }

  829.     p->reference = 1;

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

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

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

  833.         av_free(swbuf);

  834.         return -1;

  835.     }

  836. 

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

  838.     skip = tm2_read_header(l, swbuf);

  839. 

  840.     if(skip == -1){

  841.         av_free(swbuf);

  842.         return -1;

  843.     }

  844. 

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

  846.         if (skip >= buf_size) {

  847.             av_free(swbuf);

  848.             return AVERROR_INVALIDDATA;

  849.         }

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

  851.         if(t < 0){

  852.             av_free(swbuf);

  853.             return t;

  854.         }

  855.         skip += t;

  856.     }

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

  858.     if(p->key_frame)

  859.         p->pict_type = AV_PICTURE_TYPE_I;

  860.     else

  861.         p->pict_type = AV_PICTURE_TYPE_P;

  862. 

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

  864.     *data_size = sizeof(AVFrame);

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

  866.     av_free(swbuf);

  867. 

  868.     return buf_size;

  869. }

  870. 

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

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

  873.     int i, w = avctx->width, h = avctx->height;

  874. 

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

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

  877.         return -1;

  878.     }

  879. 

  880.     l->avctx = avctx;

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

  882.     avctx->pix_fmt = PIX_FMT_BGR24;

  883. 

  884.     ff_dsputil_init(&l->dsp, avctx);

  885. 

  886.     l->last  = av_malloc(4 * sizeof(*l->last)  * (w >> 2));

  887.     l->clast = av_malloc(4 * sizeof(*l->clast) * (w >> 2));

  888. 

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

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

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

  892.     }

  893. 

  894.     w += 8;

  895.     h += 8;

  896.     l->Y1_base = av_malloc(sizeof(*l->Y1_base) * w * h);

  897.     l->Y2_base = av_malloc(sizeof(*l->Y2_base) * w * h);

  898.     l->y_stride = w;

  899.     w = (w + 1) >> 1;

  900.     h = (h + 1) >> 1;

  901.     l->U1_base = av_malloc(sizeof(*l->U1_base) * w * h);

  902.     l->V1_base = av_malloc(sizeof(*l->V1_base) * w * h);

  903.     l->U2_base = av_malloc(sizeof(*l->U2_base) * w * h);

  904.     l->V2_base = av_malloc(sizeof(*l->V1_base) * w * h);

  905.     l->uv_stride = w;

  906.     l->cur = 0;

  907.     if (!l->Y1_base || !l->Y2_base || !l->U1_base ||

  908.         !l->V1_base || !l->U2_base || !l->V2_base ||

  909.         !l->last    || !l->clast) {

  910.         av_freep(l->Y1_base);

  911.         av_freep(l->Y2_base);

  912.         av_freep(l->U1_base);

  913.         av_freep(l->U2_base);

  914.         av_freep(l->V1_base);

  915.         av_freep(l->V2_base);

  916.         av_freep(l->last);

  917.         av_freep(l->clast);

  918.         return AVERROR(ENOMEM);

  919.     }

  920.     l->Y1 = l->Y1_base + l->y_stride  * 4 + 4;

  921.     l->Y2 = l->Y2_base + l->y_stride  * 4 + 4;

  922.     l->U1 = l->U1_base + l->uv_stride * 2 + 2;

  923.     l->U2 = l->U2_base + l->uv_stride * 2 + 2;

  924.     l->V1 = l->V1_base + l->uv_stride * 2 + 2;

  925.     l->V2 = l->V2_base + l->uv_stride * 2 + 2;

  926. 

  927.     return 0;

  928. }

  929. 

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

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

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

  933.     int i;

  934. 

  935.     av_free(l->last);

  936.     av_free(l->clast);

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

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

  939.     if(l->Y1){

  940.         av_free(l->Y1_base);

  941.         av_free(l->U1_base);

  942.         av_free(l->V1_base);

  943.         av_free(l->Y2_base);

  944.         av_free(l->U2_base);

  945.         av_free(l->V2_base);

  946.     }

  947. 

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

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

  950. 

  951.     return 0;

  952. }

  953. 

  954. AVCodec ff_truemotion2_decoder = {

  955.     .name           = "truemotion2",

  956.     .type           = AVMEDIA_TYPE_VIDEO,

  957.     .id             = CODEC_ID_TRUEMOTION2,

  958.     .priv_data_size = sizeof(TM2Context),

  959.     .init           = decode_init,

  960.     .close          = decode_end,

  961.     .decode         = decode_frame,

  962.     .capabilities   = CODEC_CAP_DR1,

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

  964. };