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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. 

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

  36. enum TM2_STREAMS {

  37.     TM2_C_HI = 0,

  38.     TM2_C_LO,

  39.     TM2_L_HI,

  40.     TM2_L_LO,

  41.     TM2_UPD,

  42.     TM2_MOT,

  43.     TM2_TYPE,

  44.     TM2_NUM_STREAMS

  45. };

  46. 

  47. /* Block types */

  48. enum TM2_BLOCKS {

  49.     TM2_HI_RES = 0,

  50.     TM2_MED_RES,

  51.     TM2_LOW_RES,

  52.     TM2_NULL_RES,

  53.     TM2_UPDATE,

  54.     TM2_STILL,

  55.     TM2_MOTION

  56. };

  57. 

  58. typedef struct TM2Context {

  59.     AVCodecContext *avctx;

  60.     AVFrame pic;

  61. 

  62.     GetBitContext gb;

  63.     DSPContext dsp;

  64. 

  65.     /* TM2 streams */

  66.     int *tokens[TM2_NUM_STREAMS];

  67.     int tok_lens[TM2_NUM_STREAMS];

  68.     int tok_ptrs[TM2_NUM_STREAMS];

  69.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  70.     /* for blocks decoding */

  71.     int D[4];

  72.     int CD[4];

  73.     int *last;

  74.     int *clast;

  75. 

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

  77.     int *Y1_base, *U1_base, *V1_base, *Y2_base, *U2_base, *V2_base;

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

  79.     int y_stride, uv_stride;

  80.     int cur;

  81. } TM2Context;

  82. 

  83. /**

  84. * Huffman codes for each of streams

  85. */

  86. typedef struct TM2Codes {

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

  88.     int bits;

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

  90.     int length;

  91. } TM2Codes;

  92. 

  93. /**

  94. * structure for gathering Huffman codes information

  95. */

  96. typedef struct TM2Huff {

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

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

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

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

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

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

  103.     int *nums; ///< literals

  104.     uint32_t *bits; ///< codes

  105.     int *lens; ///< codelengths

  106. } TM2Huff;

  107. 

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

  109. {

  110.     int ret;

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

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

  113.                huff->max_bits);

  114.         return AVERROR_INVALIDDATA;

  115.     }

  116. 

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

  118.         if (length == 0) {

  119.             length = 1;

  120.         }

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

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

  123.             return AVERROR_INVALIDDATA;

  124.         }

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

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

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

  128.         huff->num++;

  129.         return 0;

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

  131.         if ((ret = tm2_read_tree(ctx, prefix << 1, length + 1, huff)) < 0)

  132.             return ret;

  133.         if ((ret = tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff)) < 0)

  134.             return ret;

  135.     }

  136.     return 0;

  137. }

  138. 

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

  140. {

  141.     TM2Huff huff;

  142.     int res = 0;

  143. 

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

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

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

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

  148.     huff.num      = 0;

  149. 

  150.     /* check for correct codes parameters */

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

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

  153.         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal "

  154.                "length: %i, max code length: %i\n", huff.val_bits, huff.max_bits);

  155.         return AVERROR_INVALIDDATA;

  156.     }

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

  158.         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree "

  159.                "nodes: %i\n", huff.nodes);

  160.         return AVERROR_INVALIDDATA;

  161.     }

  162.     /* one-node tree */

  163.     if (huff.max_bits == 0)

  164.         huff.max_bits = 1;

  165. 

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

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

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

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

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

  171. 

  172.     res = tm2_read_tree(ctx, 0, 0, &huff);

  173. 

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

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

  176.                huff.num, huff.max_num);

  177.         res = AVERROR_INVALIDDATA;

  178.     }

  179. 

  180.     /* convert codes to vlc_table */

  181.     if (res >= 0) {

  182.         int i;

  183. 

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

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

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

  187.         if (res < 0)

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

  189.         else {

  190.             code->bits = huff.max_bits;

  191.             code->length = huff.max_num;

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

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

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

  195.         }

  196.     }

  197.     /* free allocated memory */

  198.     av_free(huff.nums);

  199.     av_free(huff.bits);

  200.     av_free(huff.lens);

  201. 

  202.     return res;

  203. }

  204. 

  205. static void tm2_free_codes(TM2Codes *code)

  206. {

  207.     av_free(code->recode);

  208.     if (code->vlc.table)

  209.         ff_free_vlc(&code->vlc);

  210. }

  211. 

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

  213. {

  214.     int val;

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

  216.     return code->recode[val];

  217. }

  218. 

  219. #define TM2_OLD_HEADER_MAGIC 0x00000100

  220. #define TM2_NEW_HEADER_MAGIC 0x00000101

  221. 

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

  223. {

  224.     uint32_t magic = AV_RL32(buf);

  225. 

  226.     switch (magic) {

  227.     case TM2_OLD_HEADER_MAGIC:

  228.         av_log_missing_feature(ctx->avctx, "TM2 old header", 1);

  229.         return 0;

  230.     case TM2_NEW_HEADER_MAGIC:

  231.         return 0;

  232.     default:

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

  234.         return AVERROR_INVALIDDATA;

  235.     }

  236. }

  237. 

  238. static int tm2_read_deltas(TM2Context *ctx, int stream_id)

  239. {

  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 AVERROR_INVALIDDATA;

  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, const uint8_t *buf, int stream_id, int buf_size)

  265. {

  266.     int i, ret;

  267.     int skip = 0;

  268.     int len, toks, pos;

  269.     TM2Codes codes;

  270.     GetByteContext gb;

  271. 

  272.     /* get stream length in dwords */

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

  274.     len  = bytestream2_get_be32(&gb);

  275.     skip = len * 4 + 4;

  276. 

  277.     if (len == 0)

  278.         return 4;

  279. 

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

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

  282.         return AVERROR_INVALIDDATA;

  283.     }

  284. 

  285.     toks = bytestream2_get_be32(&gb);

  286.     if (toks & 1) {

  287.         len = bytestream2_get_be32(&gb);

  288.         if (len == TM2_ESCAPE) {

  289.             len = bytestream2_get_be32(&gb);

  290.         }

  291.         if (len > 0) {

  292.             pos = bytestream2_tell(&gb);

  293.             if (skip <= pos)

  294.                 return AVERROR_INVALIDDATA;

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

  296.             if ((ret = tm2_read_deltas(ctx, stream_id)) < 0)

  297.                 return ret;

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

  299.         }

  300.     }

  301.     /* skip unused fields */

  302.     len = bytestream2_get_be32(&gb);

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

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

  305.     } else {

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

  307.     }

  308. 

  309.     pos = bytestream2_tell(&gb);

  310.     if (skip <= pos)

  311.         return AVERROR_INVALIDDATA;

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

  313.     if ((ret = tm2_build_huff_table(ctx, &codes)) < 0)

  314.         return ret;

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

  316. 

  317.     toks >>= 1;

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

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

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

  321.         tm2_free_codes(&codes);

  322.         return AVERROR_INVALIDDATA;

  323.     }

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

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

  326.     len = bytestream2_get_be32(&gb);

  327.     if (len > 0) {

  328.         pos = bytestream2_tell(&gb);

  329.         if (skip <= pos)

  330.             return AVERROR_INVALIDDATA;

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

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

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

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

  335.                 return AVERROR_INVALIDDATA;

  336.             }

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

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

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

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

  341.                 return AVERROR_INVALIDDATA;

  342.             }

  343.         }

  344.     } else {

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

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

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

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

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

  350.                 return AVERROR_INVALIDDATA;

  351.             }

  352.         }

  353.     }

  354.     tm2_free_codes(&codes);

  355. 

  356.     return skip;

  357. }

  358. 

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

  360. {

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

  362.         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]);

  363.         return 0;

  364.     }

  365.     if (type <= TM2_MOT)

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

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

  368. }

  369. 

  370. /* blocks decoding routines */

  371. 

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

  373. #define TM2_INIT_POINTERS() \

  374.     int *last, *clast; \

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

  376.     int Ystride, Ustride, Vstride;\

  377. \

  378.     Ystride = ctx->y_stride;\

  379.     Vstride = ctx->uv_stride;\

  380.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  386. 

  387. #define TM2_INIT_POINTERS_2() \

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

  389.     int oYstride, oUstride, oVstride;\

  390. \

  391.     TM2_INIT_POINTERS();\

  392.     oYstride = Ystride;\

  393.     oVstride = Vstride;\

  394.     oUstride = Ustride;\

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

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

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

  398. 

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

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

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

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

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

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

  405. 

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

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

  408. {

  409.     int ct, d;

  410.     int i, j;

  411. 

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

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

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

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

  416.             ct      += d;

  417.             last[i] += ct;

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

  419.         }

  420.         Y        += stride;

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

  422.     }

  423. }

  424. 

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

  426. {

  427.     int i, j;

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

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

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

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

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

  433.         }

  434.         data += stride;

  435.     }

  436. }

  437. 

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

  439. {

  440.     int t;

  441.     int l;

  442.     int prev;

  443. 

  444.     if (bx > 0)

  445.         prev = clast[-3];

  446.     else

  447.         prev = 0;

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

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

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

  451.     CD[0]    = t;

  452.     clast[0] = l;

  453. 

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

  455. }

  456. 

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

  458. {

  459.     int i;

  460.     int deltas[16];

  461.     TM2_INIT_POINTERS();

  462. 

  463.     /* hi-res chroma */

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

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

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

  467.     }

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

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

  470. 

  471.     /* hi-res luma */

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

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

  474. 

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

  476. }

  477. 

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

  479. {

  480.     int i;

  481.     int deltas[16];

  482.     TM2_INIT_POINTERS();

  483. 

  484.     /* low-res chroma */

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

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

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

  488. 

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

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

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

  492. 

  493.     /* hi-res luma */

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

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

  496. 

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

  498. }

  499. 

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

  501. {

  502.     int i;

  503.     int t1, t2;

  504.     int deltas[16];

  505.     TM2_INIT_POINTERS();

  506. 

  507.     /* low-res chroma */

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

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

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

  511. 

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

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

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

  515. 

  516.     /* low-res luma */

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

  518.         deltas[i] = 0;

  519. 

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

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

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

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

  524. 

  525.     if (bx > 0)

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

  527.     else

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

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

  530. 

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

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

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

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

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

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

  537. 

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

  539. }

  540. 

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

  542. {

  543.     int i;

  544.     int ct;

  545.     int left, right, diff;

  546.     int deltas[16];

  547.     TM2_INIT_POINTERS();

  548. 

  549.     /* null chroma */

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

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

  552. 

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

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

  555. 

  556.     /* null luma */

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

  558.         deltas[i] = 0;

  559. 

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

  561. 

  562.     if (bx > 0)

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

  564.     else

  565.         left = 0;

  566. 

  567.     right   = last[3];

  568.     diff    = right - left;

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

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

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

  572.     last[3] = right;

  573.     {

  574.         int tp = left;

  575. 

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

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

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

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

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

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

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

  583.     }

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

  585. }

  586. 

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

  588. {

  589.     int i, j;

  590.     TM2_INIT_POINTERS_2();

  591. 

  592.     /* update chroma */

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

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

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

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

  597.         }

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

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

  600.     }

  601.     U -= Ustride * 2;

  602.     V -= Vstride * 2;

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

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

  605. 

  606.     /* update deltas */

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

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

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

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

  611. 

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

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

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

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

  616.         }

  617.         Y  += Ystride;

  618.         Yo += oYstride;

  619.     }

  620. }

  621. 

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

  623. {

  624.     int i, j;

  625.     int d;

  626.     TM2_INIT_POINTERS_2();

  627. 

  628.     /* update chroma */

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

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

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

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

  633.         }

  634.         U  += Ustride;

  635.         V  += Vstride;

  636.         Uo += oUstride;

  637.         Vo += oVstride;

  638.     }

  639.     U -= Ustride * 2;

  640.     V -= Vstride * 2;

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

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

  643. 

  644.     /* update deltas */

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

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

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

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

  649. 

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

  651.         d = last[3];

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

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

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

  655.         }

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

  657.         Y  += Ystride;

  658.         Yo += oYstride;

  659.     }

  660. }

  661. 

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

  663. {

  664.     int i, j;

  665.     int mx, my;

  666.     TM2_INIT_POINTERS_2();

  667. 

  668.     mx = GET_TOK(ctx, TM2_MOT);

  669.     my = GET_TOK(ctx, TM2_MOT);

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

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

  672. 

  673.     Yo += my * oYstride + mx;

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

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

  676. 

  677.     /* copy chroma */

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

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

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

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

  682.         }

  683.         U  += Ustride;

  684.         V  += Vstride;

  685.         Uo += oUstride;

  686.         Vo += oVstride;

  687.     }

  688.     U -= Ustride * 2;

  689.     V -= Vstride * 2;

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

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

  692. 

  693.     /* copy luma */

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

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

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

  697.         }

  698.         Y  += Ystride;

  699.         Yo += oYstride;

  700.     }

  701.     /* calculate deltas */

  702.     Y -= Ystride * 4;

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

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

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

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

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

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

  709. }

  710. 

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

  712. {

  713.     int i, j;

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

  715.     int type;

  716.     int keyframe = 1;

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

  718.     uint8_t *dst;

  719. 

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

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

  722. 

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

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

  725.         return AVERROR_INVALIDDATA;

  726.     }

  727. 

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

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

  730. 

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

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

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

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

  735.             type = GET_TOK(ctx, TM2_TYPE);

  736.             switch(type) {

  737.             case TM2_HI_RES:

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

  739.                 break;

  740.             case TM2_MED_RES:

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

  742.                 break;

  743.             case TM2_LOW_RES:

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

  745.                 break;

  746.             case TM2_NULL_RES:

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

  748.                 break;

  749.             case TM2_UPDATE:

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

  751.                 keyframe = 0;

  752.                 break;

  753.             case TM2_STILL:

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

  755.                 keyframe = 0;

  756.                 break;

  757.             case TM2_MOTION:

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

  759.                 keyframe = 0;

  760.                 break;

  761.             default:

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

  763.             }

  764.         }

  765.     }

  766. 

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

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

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

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

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

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

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

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

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

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

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

  778.         }

  779. 

  780.         /* horizontal edge extension */

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

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

  783. 

  784.         /* vertical edge extension */

  785.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  795.         }

  796. 

  797.         Y += ctx->y_stride;

  798.         if (j & 1) {

  799.             /* horizontal edge extension */

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

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

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

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

  804. 

  805.             /* vertical edge extension */

  806.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  816.             }

  817. 

  818.             U += ctx->uv_stride;

  819.             V += ctx->uv_stride;

  820.         }

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

  822.     }

  823. 

  824.     return keyframe;

  825. }

  826. 

  827. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  829. };

  830. 

  831. #define TM2_HEADER_SIZE 40

  832. 

  833. static int decode_frame(AVCodecContext *avctx,

  834.                         void *data, int *got_frame,

  835.                         AVPacket *avpkt)

  836. {

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

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

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

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

  841.     int offset           = TM2_HEADER_SIZE;

  842.     int i, t, ret;

  843.     uint8_t *swbuf;

  844. 

  845.     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  846.     if (!swbuf) {

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

  848.         return AVERROR(ENOMEM);

  849.     }

  850.     p->reference = 1;

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

  852.     if ((ret = avctx->reget_buffer(avctx, p)) < 0) {

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

  854.         av_free(swbuf);

  855.         return ret;

  856.     }

  857. 

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

  859. 

  860.     if ((ret = tm2_read_header(l, swbuf)) < 0) {

  861.         av_free(swbuf);

  862.         return ret;

  863.     }

  864. 

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

  866.         if (offset >= buf_size) {

  867.             av_free(swbuf);

  868.             return AVERROR_INVALIDDATA;

  869.         }

  870.         t = tm2_read_stream(l, swbuf + offset, tm2_stream_order[i],

  871.                             buf_size - offset);

  872.         if (t < 0) {

  873.             av_free(swbuf);

  874.             return t;

  875.         }

  876.         offset += t;

  877.     }

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

  879.     if (p->key_frame)

  880.         p->pict_type = AV_PICTURE_TYPE_I;

  881.     else

  882.         p->pict_type = AV_PICTURE_TYPE_P;

  883. 

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

  885.     *got_frame      = 1;

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

  887.     av_free(swbuf);

  888. 

  889.     return buf_size;

  890. }

  891. 

  892. static av_cold int decode_init(AVCodecContext *avctx)

  893. {

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

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

  896. 

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

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

  899.         return AVERROR(EINVAL);

  900.     }

  901. 

  902.     l->avctx       = avctx;

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

  904.     avctx->pix_fmt = AV_PIX_FMT_BGR24;

  905. 

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

  907. 

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

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

  910. 

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

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

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

  914.     }

  915. 

  916.     w += 8;

  917.     h += 8;

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

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

  920.     l->y_stride = w;

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

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

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

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

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

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

  927.     l->uv_stride = w;

  928.     l->cur = 0;

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

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

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

  932.         av_freep(l->Y1_base);

  933.         av_freep(l->Y2_base);

  934.         av_freep(l->U1_base);

  935.         av_freep(l->U2_base);

  936.         av_freep(l->V1_base);

  937.         av_freep(l->V2_base);

  938.         av_freep(l->last);

  939.         av_freep(l->clast);

  940.         return AVERROR(ENOMEM);

  941.     }

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

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

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

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

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

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

  948. 

  949.     return 0;

  950. }

  951. 

  952. static av_cold int decode_end(AVCodecContext *avctx)

  953. {

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

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

  956.     int i;

  957. 

  958.     av_free(l->last);

  959.     av_free(l->clast);

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

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

  962.     if (l->Y1) {

  963.         av_free(l->Y1_base);

  964.         av_free(l->U1_base);

  965.         av_free(l->V1_base);

  966.         av_free(l->Y2_base);

  967.         av_free(l->U2_base);

  968.         av_free(l->V2_base);

  969.     }

  970. 

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

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

  973. 

  974.     return 0;

  975. }

  976. 

  977. AVCodec ff_truemotion2_decoder = {

  978.     .name           = "truemotion2",

  979.     .type           = AVMEDIA_TYPE_VIDEO,

  980.     .id             = AV_CODEC_ID_TRUEMOTION2,

  981.     .priv_data_size = sizeof(TM2Context),

  982.     .init           = decode_init,

  983.     .close          = decode_end,

  984.     .decode         = decode_frame,

  985.     .capabilities   = CODEC_CAP_DR1,

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

  987. };