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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. #include "internal.h"

  32. 

  33. #define TM2_ESCAPE 0x80000000

  34. #define TM2_DELTAS 64

  35. 

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

  37. enum TM2_STREAMS {

  38.     TM2_C_HI = 0,

  39.     TM2_C_LO,

  40.     TM2_L_HI,

  41.     TM2_L_LO,

  42.     TM2_UPD,

  43.     TM2_MOT,

  44.     TM2_TYPE,

  45.     TM2_NUM_STREAMS

  46. };

  47. 

  48. /* Block types */

  49. enum TM2_BLOCKS {

  50.     TM2_HI_RES = 0,

  51.     TM2_MED_RES,

  52.     TM2_LOW_RES,

  53.     TM2_NULL_RES,

  54.     TM2_UPDATE,

  55.     TM2_STILL,

  56.     TM2_MOTION

  57. };

  58. 

  59. typedef struct TM2Context {

  60.     AVCodecContext *avctx;

  61.     AVFrame pic;

  62. 

  63.     GetBitContext gb;

  64.     DSPContext dsp;

  65. 

  66.     /* TM2 streams */

  67.     int *tokens[TM2_NUM_STREAMS];

  68.     int tok_lens[TM2_NUM_STREAMS];

  69.     int tok_ptrs[TM2_NUM_STREAMS];

  70.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  71.     /* for blocks decoding */

  72.     int D[4];

  73.     int CD[4];

  74.     int *last;

  75.     int *clast;

  76. 

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

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

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

  80.     int y_stride, uv_stride;

  81.     int cur;

  82. } TM2Context;

  83. 

  84. /**

  85. * Huffman codes for each of streams

  86. */

  87. typedef struct TM2Codes {

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

  89.     int bits;

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

  91.     int length;

  92. } TM2Codes;

  93. 

  94. /**

  95. * structure for gathering Huffman codes information

  96. */

  97. typedef struct TM2Huff {

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

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

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

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

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

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

  104.     int *nums; ///< literals

  105.     uint32_t *bits; ///< codes

  106.     int *lens; ///< codelengths

  107. } TM2Huff;

  108. 

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

  110. {

  111.     int ret;

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

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

  114.                huff->max_bits);

  115.         return AVERROR_INVALIDDATA;

  116.     }

  117. 

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

  119.         if (length == 0) {

  120.             length = 1;

  121.         }

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

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

  124.             return AVERROR_INVALIDDATA;

  125.         }

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

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

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

  129.         huff->num++;

  130.         return 0;

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

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

  133.             return ret;

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

  135.             return ret;

  136.     }

  137.     return 0;

  138. }

  139. 

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

  141. {

  142.     TM2Huff huff;

  143.     int res = 0;

  144. 

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

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

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

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

  149.     huff.num      = 0;

  150. 

  151.     /* check for correct codes parameters */

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

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

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

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

  156.         return AVERROR_INVALIDDATA;

  157.     }

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

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

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

  161.         return AVERROR_INVALIDDATA;

  162.     }

  163.     /* one-node tree */

  164.     if (huff.max_bits == 0)

  165.         huff.max_bits = 1;

  166. 

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

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

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

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

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

  172. 

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

  174. 

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

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

  177.                huff.num, huff.max_num);

  178.         res = AVERROR_INVALIDDATA;

  179.     }

  180. 

  181.     /* convert codes to vlc_table */

  182.     if (res >= 0) {

  183.         int i;

  184. 

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

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

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

  188.         if (res < 0)

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

  190.         else {

  191.             code->bits = huff.max_bits;

  192.             code->length = huff.max_num;

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

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

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

  196.         }

  197.     }

  198.     /* free allocated memory */

  199.     av_free(huff.nums);

  200.     av_free(huff.bits);

  201.     av_free(huff.lens);

  202. 

  203.     return res;

  204. }

  205. 

  206. static void tm2_free_codes(TM2Codes *code)

  207. {

  208.     av_free(code->recode);

  209.     if (code->vlc.table)

  210.         ff_free_vlc(&code->vlc);

  211. }

  212. 

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

  214. {

  215.     int val;

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

  217.     return code->recode[val];

  218. }

  219. 

  220. #define TM2_OLD_HEADER_MAGIC 0x00000100

  221. #define TM2_NEW_HEADER_MAGIC 0x00000101

  222. 

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

  224. {

  225.     uint32_t magic = AV_RL32(buf);

  226. 

  227.     switch (magic) {

  228.     case TM2_OLD_HEADER_MAGIC:

  229.         avpriv_request_sample(ctx->avctx, "Old TM2 header");

  230.         return 0;

  231.     case TM2_NEW_HEADER_MAGIC:

  232.         return 0;

  233.     default:

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

  235.         return AVERROR_INVALIDDATA;

  236.     }

  237. }

  238. 

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

  240. {

  241.     int d, mb;

  242.     int i, v;

  243. 

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

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

  246. 

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

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

  249.         return AVERROR_INVALIDDATA;

  250.     }

  251. 

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

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

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

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

  256.         else

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

  258.     }

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

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

  261. 

  262.     return 0;

  263. }

  264. 

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

  266. {

  267.     int i, ret;

  268.     int skip = 0;

  269.     int len, toks, pos;

  270.     TM2Codes codes;

  271.     GetByteContext gb;

  272. 

  273.     /* get stream length in dwords */

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

  275.     len  = bytestream2_get_be32(&gb);

  276.     skip = len * 4 + 4;

  277. 

  278.     if (len == 0)

  279.         return 4;

  280. 

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

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

  283.         return AVERROR_INVALIDDATA;

  284.     }

  285. 

  286.     toks = bytestream2_get_be32(&gb);

  287.     if (toks & 1) {

  288.         len = bytestream2_get_be32(&gb);

  289.         if (len == TM2_ESCAPE) {

  290.             len = bytestream2_get_be32(&gb);

  291.         }

  292.         if (len > 0) {

  293.             pos = bytestream2_tell(&gb);

  294.             if (skip <= pos)

  295.                 return AVERROR_INVALIDDATA;

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

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

  298.                 return ret;

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

  300.         }

  301.     }

  302.     /* skip unused fields */

  303.     len = bytestream2_get_be32(&gb);

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

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

  306.     } else {

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

  308.     }

  309. 

  310.     pos = bytestream2_tell(&gb);

  311.     if (skip <= pos)

  312.         return AVERROR_INVALIDDATA;

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

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

  315.         return ret;

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

  317. 

  318.     toks >>= 1;

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

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

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

  322.         tm2_free_codes(&codes);

  323.         return AVERROR_INVALIDDATA;

  324.     }

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

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

  327.     len = bytestream2_get_be32(&gb);

  328.     if (len > 0) {

  329.         pos = bytestream2_tell(&gb);

  330.         if (skip <= pos)

  331.             return AVERROR_INVALIDDATA;

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

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

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

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

  336.                 return AVERROR_INVALIDDATA;

  337.             }

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

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

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

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

  342.                 return AVERROR_INVALIDDATA;

  343.             }

  344.         }

  345.     } else {

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

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

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

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

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

  351.                 return AVERROR_INVALIDDATA;

  352.             }

  353.         }

  354.     }

  355.     tm2_free_codes(&codes);

  356. 

  357.     return skip;

  358. }

  359. 

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

  361. {

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

  363.         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]);

  364.         return 0;

  365.     }

  366.     if (type <= TM2_MOT)

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

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

  369. }

  370. 

  371. /* blocks decoding routines */

  372. 

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

  374. #define TM2_INIT_POINTERS() \

  375.     int *last, *clast; \

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

  377.     int Ystride, Ustride, Vstride;\

  378. \

  379.     Ystride = ctx->y_stride;\

  380.     Vstride = ctx->uv_stride;\

  381.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  387. 

  388. #define TM2_INIT_POINTERS_2() \

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

  390.     int oYstride, oUstride, oVstride;\

  391. \

  392.     TM2_INIT_POINTERS();\

  393.     oYstride = Ystride;\

  394.     oVstride = Vstride;\

  395.     oUstride = Ustride;\

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

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

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

  399. 

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

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

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

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

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

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

  406. 

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

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

  409. {

  410.     int ct, d;

  411.     int i, j;

  412. 

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

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

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

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

  417.             ct      += d;

  418.             last[i] += ct;

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

  420.         }

  421.         Y        += stride;

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

  423.     }

  424. }

  425. 

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

  427. {

  428.     int i, j;

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

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

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

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

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

  434.         }

  435.         data += stride;

  436.     }

  437. }

  438. 

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

  440. {

  441.     int t;

  442.     int l;

  443.     int prev;

  444. 

  445.     if (bx > 0)

  446.         prev = clast[-3];

  447.     else

  448.         prev = 0;

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

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

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

  452.     CD[0]    = t;

  453.     clast[0] = l;

  454. 

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

  456. }

  457. 

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

  459. {

  460.     int i;

  461.     int deltas[16];

  462.     TM2_INIT_POINTERS();

  463. 

  464.     /* hi-res chroma */

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

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

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

  468.     }

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

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

  471. 

  472.     /* hi-res luma */

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

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

  475. 

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

  477. }

  478. 

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

  480. {

  481.     int i;

  482.     int deltas[16];

  483.     TM2_INIT_POINTERS();

  484. 

  485.     /* low-res chroma */

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

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

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

  489. 

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

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

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

  493. 

  494.     /* hi-res luma */

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

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

  497. 

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

  499. }

  500. 

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

  502. {

  503.     int i;

  504.     int t1, t2;

  505.     int deltas[16];

  506.     TM2_INIT_POINTERS();

  507. 

  508.     /* low-res chroma */

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

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

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

  512. 

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

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

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

  516. 

  517.     /* low-res luma */

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

  519.         deltas[i] = 0;

  520. 

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

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

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

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

  525. 

  526.     if (bx > 0)

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

  528.     else

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

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

  531. 

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

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

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

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

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

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

  538. 

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

  540. }

  541. 

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

  543. {

  544.     int i;

  545.     int ct;

  546.     int left, right, diff;

  547.     int deltas[16];

  548.     TM2_INIT_POINTERS();

  549. 

  550.     /* null chroma */

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

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

  553. 

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

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

  556. 

  557.     /* null luma */

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

  559.         deltas[i] = 0;

  560. 

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

  562. 

  563.     if (bx > 0)

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

  565.     else

  566.         left = 0;

  567. 

  568.     right   = last[3];

  569.     diff    = right - left;

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

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

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

  573.     last[3] = right;

  574.     {

  575.         int tp = left;

  576. 

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

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

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

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

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

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

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

  584.     }

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

  586. }

  587. 

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

  589. {

  590.     int i, j;

  591.     TM2_INIT_POINTERS_2();

  592. 

  593.     /* update chroma */

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

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

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

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

  598.         }

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

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

  601.     }

  602.     U -= Ustride * 2;

  603.     V -= Vstride * 2;

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

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

  606. 

  607.     /* update deltas */

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

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

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

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

  612. 

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

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

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

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

  617.         }

  618.         Y  += Ystride;

  619.         Yo += oYstride;

  620.     }

  621. }

  622. 

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

  624. {

  625.     int i, j;

  626.     int d;

  627.     TM2_INIT_POINTERS_2();

  628. 

  629.     /* update chroma */

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

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

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

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

  634.         }

  635.         U  += Ustride;

  636.         V  += Vstride;

  637.         Uo += oUstride;

  638.         Vo += oVstride;

  639.     }

  640.     U -= Ustride * 2;

  641.     V -= Vstride * 2;

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

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

  644. 

  645.     /* update deltas */

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

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

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

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

  650. 

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

  652.         d = last[3];

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

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

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

  656.         }

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

  658.         Y  += Ystride;

  659.         Yo += oYstride;

  660.     }

  661. }

  662. 

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

  664. {

  665.     int i, j;

  666.     int mx, my;

  667.     TM2_INIT_POINTERS_2();

  668. 

  669.     mx = GET_TOK(ctx, TM2_MOT);

  670.     my = GET_TOK(ctx, TM2_MOT);

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

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

  673. 

  674.     Yo += my * oYstride + mx;

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

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

  677. 

  678.     /* copy chroma */

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

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

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

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

  683.         }

  684.         U  += Ustride;

  685.         V  += Vstride;

  686.         Uo += oUstride;

  687.         Vo += oVstride;

  688.     }

  689.     U -= Ustride * 2;

  690.     V -= Vstride * 2;

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

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

  693. 

  694.     /* copy luma */

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

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

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

  698.         }

  699.         Y  += Ystride;

  700.         Yo += oYstride;

  701.     }

  702.     /* calculate deltas */

  703.     Y -= Ystride * 4;

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

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

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

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

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

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

  710. }

  711. 

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

  713. {

  714.     int i, j;

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

  716.     int type;

  717.     int keyframe = 1;

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

  719.     uint8_t *dst;

  720. 

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

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

  723. 

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

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

  726.         return AVERROR_INVALIDDATA;

  727.     }

  728. 

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

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

  731. 

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

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

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

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

  736.             type = GET_TOK(ctx, TM2_TYPE);

  737.             switch(type) {

  738.             case TM2_HI_RES:

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

  740.                 break;

  741.             case TM2_MED_RES:

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

  743.                 break;

  744.             case TM2_LOW_RES:

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

  746.                 break;

  747.             case TM2_NULL_RES:

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

  749.                 break;

  750.             case TM2_UPDATE:

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

  752.                 keyframe = 0;

  753.                 break;

  754.             case TM2_STILL:

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

  756.                 keyframe = 0;

  757.                 break;

  758.             case TM2_MOTION:

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

  760.                 keyframe = 0;

  761.                 break;

  762.             default:

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

  764.             }

  765.         }

  766.     }

  767. 

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

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

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

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

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

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

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

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

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

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

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

  779.         }

  780. 

  781.         /* horizontal edge extension */

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

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

  784. 

  785.         /* vertical edge extension */

  786.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  796.         }

  797. 

  798.         Y += ctx->y_stride;

  799.         if (j & 1) {

  800.             /* horizontal edge extension */

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

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

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

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

  805. 

  806.             /* vertical edge extension */

  807.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  817.             }

  818. 

  819.             U += ctx->uv_stride;

  820.             V += ctx->uv_stride;

  821.         }

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

  823.     }

  824. 

  825.     return keyframe;

  826. }

  827. 

  828. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  830. };

  831. 

  832. #define TM2_HEADER_SIZE 40

  833. 

  834. static int decode_frame(AVCodecContext *avctx,

  835.                         void *data, int *got_frame,

  836.                         AVPacket *avpkt)

  837. {

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

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

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

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

  842.     int offset           = TM2_HEADER_SIZE;

  843.     int i, t, ret;

  844.     uint8_t *swbuf;

  845. 

  846.     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  847.     if (!swbuf) {

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

  849.         return AVERROR(ENOMEM);

  850.     }

  851. 

  852.     if ((ret = ff_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.     ret = av_frame_ref(data, &l->pic);

  887.     av_free(swbuf);

  888. 

  889.     return (ret < 0) ? ret : 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.     avcodec_get_frame_defaults(&l->pic);

  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.     av_frame_unref(pic);

  972. 

  973.     return 0;

  974. }

  975. 

  976. AVCodec ff_truemotion2_decoder = {

  977.     .name           = "truemotion2",

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

  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. };