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FFmpeg/libavcodec/truemotion2.c

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  1. /*

  2.  * Duck/ON2 TrueMotion 2 Decoder

  3.  * Copyright (c) 2005 Konstantin Shishkov

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /**

  23.  * @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.     uint8_t *buffer;

  67.     int buffer_size;

  68. 

  69.     /* TM2 streams */

  70.     int *tokens[TM2_NUM_STREAMS];

  71.     int tok_lens[TM2_NUM_STREAMS];

  72.     int tok_ptrs[TM2_NUM_STREAMS];

  73.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  74.     /* for blocks decoding */

  75.     int D[4];

  76.     int CD[4];

  77.     int *last;

  78.     int *clast;

  79. 

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

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

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

  83.     int y_stride, uv_stride;

  84.     int cur;

  85. } TM2Context;

  86. 

  87. /**

  88. * Huffman codes for each of streams

  89. */

  90. typedef struct TM2Codes {

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

  92.     int bits;

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

  94.     int length;

  95. } TM2Codes;

  96. 

  97. /**

  98. * structure for gathering Huffman codes information

  99. */

  100. typedef struct TM2Huff {

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

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

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

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

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

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

  107.     int *nums; ///< literals

  108.     uint32_t *bits; ///< codes

  109.     int *lens; ///< codelengths

  110. } TM2Huff;

  111. 

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

  113. {

  114.     int ret;

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

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

  117.                huff->max_bits);

  118.         return AVERROR_INVALIDDATA;

  119.     }

  120. 

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

  122.         if (length == 0) {

  123.             length = 1;

  124.         }

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

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

  127.             return AVERROR_INVALIDDATA;

  128.         }

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

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

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

  132.         huff->num++;

  133.         return 0;

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

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

  136.             return ret;

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

  138.             return ret;

  139.     }

  140.     return 0;

  141. }

  142. 

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

  144. {

  145.     TM2Huff huff;

  146.     int res = 0;

  147. 

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

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

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

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

  152.     huff.num      = 0;

  153. 

  154.     /* check for correct codes parameters */

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

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

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

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

  159.         return AVERROR_INVALIDDATA;

  160.     }

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

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

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

  164.         return AVERROR_INVALIDDATA;

  165.     }

  166.     /* one-node tree */

  167.     if (huff.max_bits == 0)

  168.         huff.max_bits = 1;

  169. 

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

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

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

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

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

  175. 

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

  177. 

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

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

  180.                huff.num, huff.max_num);

  181.         res = AVERROR_INVALIDDATA;

  182.     }

  183. 

  184.     /* convert codes to vlc_table */

  185.     if (res >= 0) {

  186.         int i;

  187. 

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

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

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

  191.         if (res < 0)

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

  193.         else {

  194.             code->bits = huff.max_bits;

  195.             code->length = huff.max_num;

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

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

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

  199.         }

  200.     }

  201.     /* free allocated memory */

  202.     av_free(huff.nums);

  203.     av_free(huff.bits);

  204.     av_free(huff.lens);

  205. 

  206.     return res;

  207. }

  208. 

  209. static void tm2_free_codes(TM2Codes *code)

  210. {

  211.     av_free(code->recode);

  212.     if (code->vlc.table)

  213.         ff_free_vlc(&code->vlc);

  214. }

  215. 

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

  217. {

  218.     int val;

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

  220.     if(val<0)

  221.         return -1;

  222.     return code->recode[val];

  223. }

  224. 

  225. #define TM2_OLD_HEADER_MAGIC 0x00000100

  226. #define TM2_NEW_HEADER_MAGIC 0x00000101

  227. 

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

  229. {

  230.     uint32_t magic = AV_RL32(buf);

  231. 

  232.     switch (magic) {

  233.     case TM2_OLD_HEADER_MAGIC:

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

  235.         return 0;

  236.     case TM2_NEW_HEADER_MAGIC:

  237.         return 0;

  238.     default:

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

  240.         return AVERROR_INVALIDDATA;

  241.     }

  242. }

  243. 

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

  245. {

  246.     int d, mb;

  247.     int i, v;

  248. 

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

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

  251. 

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

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

  254.         return AVERROR_INVALIDDATA;

  255.     }

  256. 

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

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

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

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

  261.         else

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

  263.     }

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

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

  266. 

  267.     return 0;

  268. }

  269. 

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

  271. {

  272.     int i, ret;

  273.     int skip = 0;

  274.     int len, toks, pos;

  275.     TM2Codes codes;

  276.     GetByteContext gb;

  277. 

  278.     if (buf_size < 4) {

  279.         av_log(ctx->avctx, AV_LOG_ERROR, "not enough space for len left\n");

  280.         return AVERROR_INVALIDDATA;

  281.     }

  282. 

  283.     /* get stream length in dwords */

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

  285.     len  = bytestream2_get_be32(&gb);

  286.     skip = len * 4 + 4;

  287. 

  288.     if (len == 0)

  289.         return 4;

  290. 

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

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

  293.         return AVERROR_INVALIDDATA;

  294.     }

  295. 

  296.     toks = bytestream2_get_be32(&gb);

  297.     if (toks & 1) {

  298.         len = bytestream2_get_be32(&gb);

  299.         if (len == TM2_ESCAPE) {

  300.             len = bytestream2_get_be32(&gb);

  301.         }

  302.         if (len > 0) {

  303.             pos = bytestream2_tell(&gb);

  304.             if (skip <= pos)

  305.                 return AVERROR_INVALIDDATA;

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

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

  308.                 return ret;

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

  310.         }

  311.     }

  312.     /* skip unused fields */

  313.     len = bytestream2_get_be32(&gb);

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

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

  316.     } else {

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

  318.     }

  319. 

  320.     pos = bytestream2_tell(&gb);

  321.     if (skip <= pos)

  322.         return AVERROR_INVALIDDATA;

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

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

  325.         return ret;

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

  327. 

  328.     toks >>= 1;

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

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

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

  332.         tm2_free_codes(&codes);

  333.         return AVERROR_INVALIDDATA;

  334.     }

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

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

  337.     len = bytestream2_get_be32(&gb);

  338.     if (len > 0) {

  339.         pos = bytestream2_tell(&gb);

  340.         if (skip <= pos)

  341.             return AVERROR_INVALIDDATA;

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

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

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

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

  346.                 return AVERROR_INVALIDDATA;

  347.             }

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

  349.             if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS || ctx->tokens[stream_id][i]<0) {

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

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

  352.                 return AVERROR_INVALIDDATA;

  353.             }

  354.         }

  355.     } else {

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

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

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

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

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

  361.                 return AVERROR_INVALIDDATA;

  362.             }

  363.         }

  364.     }

  365.     tm2_free_codes(&codes);

  366. 

  367.     return skip;

  368. }

  369. 

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

  371. {

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

  373.         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]);

  374.         return 0;

  375.     }

  376.     if (type <= TM2_MOT) {

  377.         if (ctx->tokens[type][ctx->tok_ptrs[type]] >= TM2_DELTAS) {

  378.             av_log(ctx->avctx, AV_LOG_ERROR, "token %d is too large\n", ctx->tokens[type][ctx->tok_ptrs[type]]);

  379.             return 0;

  380.         }

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

  382.     }

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

  384. }

  385. 

  386. /* blocks decoding routines */

  387. 

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

  389. #define TM2_INIT_POINTERS() \

  390.     int *last, *clast; \

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

  392.     int Ystride, Ustride, Vstride;\

  393. \

  394.     Ystride = ctx->y_stride;\

  395.     Vstride = ctx->uv_stride;\

  396.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  402. 

  403. #define TM2_INIT_POINTERS_2() \

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

  405.     int oYstride, oUstride, oVstride;\

  406. \

  407.     TM2_INIT_POINTERS();\

  408.     oYstride = Ystride;\

  409.     oVstride = Vstride;\

  410.     oUstride = Ustride;\

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

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

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

  414. 

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

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

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

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

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

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

  421. 

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

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

  424. {

  425.     int ct, d;

  426.     int i, j;

  427. 

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

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

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

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

  432.             ct      += d;

  433.             last[i] += ct;

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

  435.         }

  436.         Y        += stride;

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

  438.     }

  439. }

  440. 

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

  442. {

  443.     int i, j;

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

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

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

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

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

  449.         }

  450.         data += stride;

  451.     }

  452. }

  453. 

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

  455. {

  456.     int t;

  457.     int l;

  458.     int prev;

  459. 

  460.     if (bx > 0)

  461.         prev = clast[-3];

  462.     else

  463.         prev = 0;

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

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

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

  467.     CD[0]    = t;

  468.     clast[0] = l;

  469. 

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

  471. }

  472. 

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

  474. {

  475.     int i;

  476.     int deltas[16];

  477.     TM2_INIT_POINTERS();

  478. 

  479.     /* hi-res chroma */

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

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

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

  483.     }

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

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

  486. 

  487.     /* hi-res luma */

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

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

  490. 

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

  492. }

  493. 

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

  495. {

  496.     int i;

  497.     int deltas[16];

  498.     TM2_INIT_POINTERS();

  499. 

  500.     /* low-res chroma */

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

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

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

  504. 

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

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

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

  508. 

  509.     /* hi-res luma */

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

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

  512. 

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

  514. }

  515. 

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

  517. {

  518.     int i;

  519.     int t1, t2;

  520.     int deltas[16];

  521.     TM2_INIT_POINTERS();

  522. 

  523.     /* low-res chroma */

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

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

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

  527. 

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

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

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

  531. 

  532.     /* low-res luma */

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

  534.         deltas[i] = 0;

  535. 

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

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

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

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

  540. 

  541.     if (bx > 0)

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

  543.     else

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

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

  546. 

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

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

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

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

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

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

  553. 

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

  555. }

  556. 

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

  558. {

  559.     int i;

  560.     int ct;

  561.     int left, right, diff;

  562.     int deltas[16];

  563.     TM2_INIT_POINTERS();

  564. 

  565.     /* null chroma */

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

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

  568. 

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

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

  571. 

  572.     /* null luma */

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

  574.         deltas[i] = 0;

  575. 

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

  577. 

  578.     if (bx > 0)

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

  580.     else

  581.         left = 0;

  582. 

  583.     right   = last[3];

  584.     diff    = right - left;

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

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

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

  588.     last[3] = right;

  589.     {

  590.         int tp = left;

  591. 

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

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

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

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

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

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

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

  599.     }

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

  601. }

  602. 

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

  604. {

  605.     int i, j;

  606.     TM2_INIT_POINTERS_2();

  607. 

  608.     /* update chroma */

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

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

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

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

  613.         }

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

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

  616.     }

  617.     U -= Ustride * 2;

  618.     V -= Vstride * 2;

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

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

  621. 

  622.     /* update deltas */

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

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

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

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

  627. 

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

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

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

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

  632.         }

  633.         Y  += Ystride;

  634.         Yo += oYstride;

  635.     }

  636. }

  637. 

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

  639. {

  640.     int i, j;

  641.     int d;

  642.     TM2_INIT_POINTERS_2();

  643. 

  644.     /* update chroma */

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

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

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

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

  649.         }

  650.         U  += Ustride;

  651.         V  += Vstride;

  652.         Uo += oUstride;

  653.         Vo += oVstride;

  654.     }

  655.     U -= Ustride * 2;

  656.     V -= Vstride * 2;

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

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

  659. 

  660.     /* update deltas */

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

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

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

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

  665. 

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

  667.         d = last[3];

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

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

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

  671.         }

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

  673.         Y  += Ystride;

  674.         Yo += oYstride;

  675.     }

  676. }

  677. 

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

  679. {

  680.     int i, j;

  681.     int mx, my;

  682.     TM2_INIT_POINTERS_2();

  683. 

  684.     mx = GET_TOK(ctx, TM2_MOT);

  685.     my = GET_TOK(ctx, TM2_MOT);

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

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

  688. 

  689.     if (4*bx+mx<0 || 4*by+my<0 || 4*bx+mx+4 > ctx->avctx->width || 4*by+my+4 > ctx->avctx->height) {

  690.         av_log(ctx->avctx, AV_LOG_ERROR, "MV out of picture\n");

  691.         return;

  692.     }

  693. 

  694.     Yo += my * oYstride + mx;

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

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

  697. 

  698.     /* copy chroma */

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

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

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

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

  703.         }

  704.         U  += Ustride;

  705.         V  += Vstride;

  706.         Uo += oUstride;

  707.         Vo += oVstride;

  708.     }

  709.     U -= Ustride * 2;

  710.     V -= Vstride * 2;

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

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

  713. 

  714.     /* copy luma */

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

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

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

  718.         }

  719.         Y  += Ystride;

  720.         Yo += oYstride;

  721.     }

  722.     /* calculate deltas */

  723.     Y -= Ystride * 4;

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

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

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

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

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

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

  730. }

  731. 

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

  733. {

  734.     int i, j;

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

  736.     int type;

  737.     int keyframe = 1;

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

  739.     uint8_t *dst;

  740. 

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

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

  743. 

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

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

  746.         return AVERROR_INVALIDDATA;

  747.     }

  748. 

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

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

  751. 

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

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

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

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

  756.             type = GET_TOK(ctx, TM2_TYPE);

  757.             switch(type) {

  758.             case TM2_HI_RES:

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

  760.                 break;

  761.             case TM2_MED_RES:

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

  763.                 break;

  764.             case TM2_LOW_RES:

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

  766.                 break;

  767.             case TM2_NULL_RES:

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

  769.                 break;

  770.             case TM2_UPDATE:

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

  772.                 keyframe = 0;

  773.                 break;

  774.             case TM2_STILL:

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

  776.                 keyframe = 0;

  777.                 break;

  778.             case TM2_MOTION:

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

  780.                 keyframe = 0;

  781.                 break;

  782.             default:

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

  784.             }

  785.         }

  786.     }

  787. 

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

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

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

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

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

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

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

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

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

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

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

  799.         }

  800. 

  801.         /* horizontal edge extension */

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

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

  804. 

  805.         /* vertical edge extension */

  806.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  816.         }

  817. 

  818.         Y += ctx->y_stride;

  819.         if (j & 1) {

  820.             /* horizontal edge extension */

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

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

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

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

  825. 

  826.             /* vertical edge extension */

  827.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  837.             }

  838. 

  839.             U += ctx->uv_stride;

  840.             V += ctx->uv_stride;

  841.         }

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

  843.     }

  844. 

  845.     return keyframe;

  846. }

  847. 

  848. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  850. };

  851. 

  852. #define TM2_HEADER_SIZE 40

  853. 

  854. static int decode_frame(AVCodecContext *avctx,

  855.                         void *data, int *got_frame,

  856.                         AVPacket *avpkt)

  857. {

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

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

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

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

  862.     int offset           = TM2_HEADER_SIZE;

  863.     int i, t, ret;

  864. 

  865.     av_fast_padded_malloc(&l->buffer, &l->buffer_size, buf_size);

  866.     if (!l->buffer) {

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

  868.         return AVERROR(ENOMEM);

  869.     }

  870. 

  871.     if ((ret = ff_reget_buffer(avctx, p)) < 0)

  872.         return ret;

  873. 

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

  875. 

  876.     if ((ret = tm2_read_header(l, l->buffer)) < 0) {

  877.         return ret;

  878.     }

  879. 

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

  881.         if (offset >= buf_size) {

  882.             av_log(avctx, AV_LOG_ERROR, "no space for tm2_read_stream\n");

  883.             return AVERROR_INVALIDDATA;

  884.         }

  885. 

  886.         t = tm2_read_stream(l, l->buffer + offset, tm2_stream_order[i],

  887.                             buf_size - offset);

  888.         if (t < 0) {

  889.             int j = tm2_stream_order[i];

  890.             memset(l->tokens[j], 0, sizeof(**l->tokens) * l->tok_lens[j]);

  891.             return t;

  892.         }

  893.         offset += t;

  894.     }

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

  896.     if (p->key_frame)

  897.         p->pict_type = AV_PICTURE_TYPE_I;

  898.     else

  899.         p->pict_type = AV_PICTURE_TYPE_P;

  900. 

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

  902.     *got_frame      = 1;

  903.     ret = av_frame_ref(data, &l->pic);

  904. 

  905.     return (ret < 0) ? ret : buf_size;

  906. }

  907. 

  908. static av_cold int decode_init(AVCodecContext *avctx)

  909. {

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

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

  912. 

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

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

  915.         return AVERROR(EINVAL);

  916.     }

  917. 

  918.     l->avctx       = avctx;

  919.     avcodec_get_frame_defaults(&l->pic);

  920.     avctx->pix_fmt = AV_PIX_FMT_BGR24;

  921. 

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

  923. 

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

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

  926. 

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

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

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

  930.     }

  931. 

  932.     w += 8;

  933.     h += 8;

  934.     l->Y1_base = av_mallocz(sizeof(*l->Y1_base) * w * h);

  935.     l->Y2_base = av_mallocz(sizeof(*l->Y2_base) * w * h);

  936.     l->y_stride = w;

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

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

  939.     l->U1_base = av_mallocz(sizeof(*l->U1_base) * w * h);

  940.     l->V1_base = av_mallocz(sizeof(*l->V1_base) * w * h);

  941.     l->U2_base = av_mallocz(sizeof(*l->U2_base) * w * h);

  942.     l->V2_base = av_mallocz(sizeof(*l->V1_base) * w * h);

  943.     l->uv_stride = w;

  944.     l->cur = 0;

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

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

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

  948.         av_freep(l->Y1_base);

  949.         av_freep(l->Y2_base);

  950.         av_freep(l->U1_base);

  951.         av_freep(l->U2_base);

  952.         av_freep(l->V1_base);

  953.         av_freep(l->V2_base);

  954.         av_freep(l->last);

  955.         av_freep(l->clast);

  956.         return AVERROR(ENOMEM);

  957.     }

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

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

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

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

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

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

  964. 

  965.     return 0;

  966. }

  967. 

  968. static av_cold int decode_end(AVCodecContext *avctx)

  969. {

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

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

  972.     int i;

  973. 

  974.     av_free(l->last);

  975.     av_free(l->clast);

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

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

  978.     if (l->Y1) {

  979.         av_free(l->Y1_base);

  980.         av_free(l->U1_base);

  981.         av_free(l->V1_base);

  982.         av_free(l->Y2_base);

  983.         av_free(l->U2_base);

  984.         av_free(l->V2_base);

  985.     }

  986.     av_freep(&l->buffer);

  987.     l->buffer_size = 0;

  988. 

  989.     av_frame_unref(pic);

  990. 

  991.     return 0;

  992. }

  993. 

  994. AVCodec ff_truemotion2_decoder = {

  995.     .name           = "truemotion2",

  996.     .type           = AVMEDIA_TYPE_VIDEO,

  997.     .id             = AV_CODEC_ID_TRUEMOTION2,

  998.     .priv_data_size = sizeof(TM2Context),

  999.     .init           = decode_init,

  1000.     .close          = decode_end,

  1001.     .decode         = decode_frame,

  1002.     .capabilities   = CODEC_CAP_DR1,

  1003.     .long_name      = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),

  1004. };