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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 <inttypes.h>

  28. 

  29. #include "avcodec.h"

  30. #include "bswapdsp.h"

  31. #include "bytestream.h"

  32. #include "get_bits.h"

  33. #include "internal.h"

  34. 

  35. #define TM2_ESCAPE 0x80000000

  36. #define TM2_DELTAS 64

  37. 

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

  39. enum TM2_STREAMS {

  40.     TM2_C_HI = 0,

  41.     TM2_C_LO,

  42.     TM2_L_HI,

  43.     TM2_L_LO,

  44.     TM2_UPD,

  45.     TM2_MOT,

  46.     TM2_TYPE,

  47.     TM2_NUM_STREAMS

  48. };

  49. 

  50. /* Block types */

  51. enum TM2_BLOCKS {

  52.     TM2_HI_RES = 0,

  53.     TM2_MED_RES,

  54.     TM2_LOW_RES,

  55.     TM2_NULL_RES,

  56.     TM2_UPDATE,

  57.     TM2_STILL,

  58.     TM2_MOTION

  59. };

  60. 

  61. typedef struct TM2Context {

  62.     AVCodecContext *avctx;

  63.     AVFrame *pic;

  64. 

  65.     GetBitContext gb;

  66.     int error;

  67.     BswapDSPContext bdsp;

  68. 

  69.     uint8_t *buffer;

  70.     int buffer_size;

  71. 

  72.     /* TM2 streams */

  73.     int *tokens[TM2_NUM_STREAMS];

  74.     int tok_lens[TM2_NUM_STREAMS];

  75.     int tok_ptrs[TM2_NUM_STREAMS];

  76.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  77.     /* for blocks decoding */

  78.     int D[4];

  79.     int CD[4];

  80.     int *last;

  81.     int *clast;

  82. 

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

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

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

  86.     int y_stride, uv_stride;

  87.     int cur;

  88. } TM2Context;

  89. 

  90. /**

  91. * Huffman codes for each of streams

  92. */

  93. typedef struct TM2Codes {

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

  95.     int bits;

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

  97.     int length;

  98. } TM2Codes;

  99. 

  100. /**

  101. * structure for gathering Huffman codes information

  102. */

  103. typedef struct TM2Huff {

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

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

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

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

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

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

  110.     int *nums; ///< literals

  111.     uint32_t *bits; ///< codes

  112.     int *lens; ///< codelengths

  113. } TM2Huff;

  114. 

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

  116. {

  117.     int ret;

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

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

  120.                huff->max_bits);

  121.         return AVERROR_INVALIDDATA;

  122.     }

  123. 

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

  125.         if (length == 0) {

  126.             length = 1;

  127.         }

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

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

  130.             return AVERROR_INVALIDDATA;

  131.         }

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

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

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

  135.         huff->num++;

  136.         return 0;

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

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

  139.             return ret;

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

  141.             return ret;

  142.     }

  143.     return 0;

  144. }

  145. 

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

  147. {

  148.     TM2Huff huff;

  149.     int res = 0;

  150. 

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

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

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

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

  155.     huff.num      = 0;

  156. 

  157.     /* check for correct codes parameters */

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

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

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

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

  162.         return AVERROR_INVALIDDATA;

  163.     }

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

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

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

  167.         return AVERROR_INVALIDDATA;

  168.     }

  169.     /* one-node tree */

  170.     if (huff.max_bits == 0)

  171.         huff.max_bits = 1;

  172. 

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

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

  175.     huff.nums    = av_calloc(huff.max_num, sizeof(int));

  176.     huff.bits    = av_calloc(huff.max_num, sizeof(uint32_t));

  177.     huff.lens    = av_calloc(huff.max_num, sizeof(int));

  178. 

  179.     if (!huff.nums || !huff.bits || !huff.lens) {

  180.         res = AVERROR(ENOMEM);

  181.         goto out;

  182.     }

  183. 

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

  185. 

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

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

  188.                huff.num, huff.max_num);

  189.         res = AVERROR_INVALIDDATA;

  190.     }

  191. 

  192.     /* convert codes to vlc_table */

  193.     if (res >= 0) {

  194.         int i;

  195. 

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

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

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

  199.         if (res < 0)

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

  201.         else {

  202.             code->bits = huff.max_bits;

  203.             code->length = huff.max_num;

  204.             code->recode = av_malloc_array(code->length, sizeof(int));

  205.             if (!code->recode) {

  206.                 res = AVERROR(ENOMEM);

  207.                 goto out;

  208.             }

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

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

  211.         }

  212.     }

  213. 

  214. out:

  215.     /* free allocated memory */

  216.     av_free(huff.nums);

  217.     av_free(huff.bits);

  218.     av_free(huff.lens);

  219. 

  220.     return res;

  221. }

  222. 

  223. static void tm2_free_codes(TM2Codes *code)

  224. {

  225.     av_free(code->recode);

  226.     if (code->vlc.table)

  227.         ff_free_vlc(&code->vlc);

  228. }

  229. 

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

  231. {

  232.     int val;

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

  234.     if(val<0)

  235.         return -1;

  236.     return code->recode[val];

  237. }

  238. 

  239. #define TM2_OLD_HEADER_MAGIC 0x00000100

  240. #define TM2_NEW_HEADER_MAGIC 0x00000101

  241. 

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

  243. {

  244.     uint32_t magic = AV_RL32(buf);

  245. 

  246.     switch (magic) {

  247.     case TM2_OLD_HEADER_MAGIC:

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

  249.         return 0;

  250.     case TM2_NEW_HEADER_MAGIC:

  251.         return 0;

  252.     default:

  253.         av_log(ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08"PRIX32"\n",

  254.                magic);

  255.         return AVERROR_INVALIDDATA;

  256.     }

  257. }

  258. 

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

  260. {

  261.     int d, mb;

  262.     int i, v;

  263. 

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

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

  266. 

  267.     av_assert2(mb < 32);

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

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

  270.         return AVERROR_INVALIDDATA;

  271.     }

  272. 

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

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

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

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

  277.         else

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

  279.     }

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

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

  282. 

  283.     return 0;

  284. }

  285. 

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

  287. {

  288.     int i, ret;

  289.     int skip = 0;

  290.     int len, toks, pos;

  291.     TM2Codes codes;

  292.     GetByteContext gb;

  293. 

  294.     if (buf_size < 4) {

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

  296.         return AVERROR_INVALIDDATA;

  297.     }

  298. 

  299.     /* get stream length in dwords */

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

  301.     len  = bytestream2_get_be32(&gb);

  302. 

  303.     if (len == 0)

  304.         return 4;

  305. 

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

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

  308.         return AVERROR_INVALIDDATA;

  309.     }

  310.     skip = len * 4 + 4;

  311. 

  312.     toks = bytestream2_get_be32(&gb);

  313.     if (toks & 1) {

  314.         len = bytestream2_get_be32(&gb);

  315.         if (len == TM2_ESCAPE) {

  316.             len = bytestream2_get_be32(&gb);

  317.         }

  318.         if (len > 0) {

  319.             pos = bytestream2_tell(&gb);

  320.             if (skip <= pos)

  321.                 return AVERROR_INVALIDDATA;

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

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

  324.                 return ret;

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

  326.         }

  327.     }

  328.     /* skip unused fields */

  329.     len = bytestream2_get_be32(&gb);

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

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

  332.     } else {

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

  334.     }

  335. 

  336.     pos = bytestream2_tell(&gb);

  337.     if (skip <= pos)

  338.         return AVERROR_INVALIDDATA;

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

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

  341.         return ret;

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

  343. 

  344.     toks >>= 1;

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

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

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

  348.         ret = AVERROR_INVALIDDATA;

  349.         goto end;

  350.     }

  351.     ret = av_reallocp_array(&ctx->tokens[stream_id], toks, sizeof(int));

  352.     if (ret < 0) {

  353.         ctx->tok_lens[stream_id] = 0;

  354.         goto end;

  355.     }

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

  357.     len = bytestream2_get_be32(&gb);

  358.     if (len > 0) {

  359.         pos = bytestream2_tell(&gb);

  360.         if (skip <= pos) {

  361.             ret = AVERROR_INVALIDDATA;

  362.             goto end;

  363.         }

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

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

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

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

  368.                 ret = AVERROR_INVALIDDATA;

  369.                 goto end;

  370.             }

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

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

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

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

  375.                 ret = AVERROR_INVALIDDATA;

  376.                 goto end;

  377.             }

  378.         }

  379.     } else {

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

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

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

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

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

  385.                 ret = AVERROR_INVALIDDATA;

  386.                 goto end;

  387.             }

  388.         }

  389.     }

  390. 

  391.     ret = skip;

  392. 

  393. end:

  394.     tm2_free_codes(&codes);

  395.     return ret;

  396. }

  397. 

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

  399. {

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

  401.         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]);

  402.         ctx->error = 1;

  403.         return 0;

  404.     }

  405.     if (type <= TM2_MOT) {

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

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

  408.             return 0;

  409.         }

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

  411.     }

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

  413. }

  414. 

  415. /* blocks decoding routines */

  416. 

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

  418. #define TM2_INIT_POINTERS() \

  419.     int *last, *clast; \

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

  421.     int Ystride, Ustride, Vstride;\

  422. \

  423.     Ystride = ctx->y_stride;\

  424.     Vstride = ctx->uv_stride;\

  425.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  431. 

  432. #define TM2_INIT_POINTERS_2() \

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

  434.     int oYstride, oUstride, oVstride;\

  435. \

  436.     TM2_INIT_POINTERS();\

  437.     oYstride = Ystride;\

  438.     oVstride = Vstride;\

  439.     oUstride = Ustride;\

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

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

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

  443. 

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

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

  446.     CD[0] = (unsigned)CHR[         1] - (unsigned)last[1];\

  447.     CD[1] = (unsigned)CHR[stride + 1] - (unsigned) CHR[1];\

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

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

  450. 

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

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

  453. {

  454.     int ct, d;

  455.     int i, j;

  456. 

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

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

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

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

  461.             ct      += d;

  462.             last[i] += ct;

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

  464.         }

  465.         Y        += stride;

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

  467.     }

  468. }

  469. 

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

  471. {

  472.     int i, j;

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

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

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

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

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

  478.         }

  479.         data += stride;

  480.     }

  481. }

  482. 

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

  484. {

  485.     int t;

  486.     int l;

  487.     int prev;

  488. 

  489.     if (bx > 0)

  490.         prev = clast[-3];

  491.     else

  492.         prev = 0;

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

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

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

  496.     CD[0]    = t;

  497.     clast[0] = l;

  498. 

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

  500. }

  501. 

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

  503. {

  504.     int i;

  505.     int deltas[16];

  506.     TM2_INIT_POINTERS();

  507. 

  508.     /* hi-res chroma */

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

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

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

  512.     }

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

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

  515. 

  516.     /* hi-res luma */

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

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

  519. 

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

  521. }

  522. 

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

  524. {

  525.     int i;

  526.     int deltas[16];

  527.     TM2_INIT_POINTERS();

  528. 

  529.     /* low-res chroma */

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

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

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

  533. 

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

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

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

  537. 

  538.     /* hi-res luma */

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

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

  541. 

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

  543. }

  544. 

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

  546. {

  547.     int i;

  548.     int t1, t2;

  549.     int deltas[16];

  550.     TM2_INIT_POINTERS();

  551. 

  552.     /* low-res chroma */

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

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

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

  556. 

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

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

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

  560. 

  561.     /* low-res luma */

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

  563.         deltas[i] = 0;

  564. 

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

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

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

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

  569. 

  570.     if (bx > 0)

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

  572.     else

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

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

  575. 

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

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

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

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

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

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

  582. 

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

  584. }

  585. 

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

  587. {

  588.     int i;

  589.     int ct;

  590.     int left, right, diff;

  591.     int deltas[16];

  592.     TM2_INIT_POINTERS();

  593. 

  594.     /* null chroma */

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

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

  597. 

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

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

  600. 

  601.     /* null luma */

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

  603.         deltas[i] = 0;

  604. 

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

  606. 

  607.     if (bx > 0)

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

  609.     else

  610.         left = 0;

  611. 

  612.     right   = last[3];

  613.     diff    = right - left;

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

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

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

  617.     last[3] = right;

  618.     {

  619.         int tp = left;

  620. 

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

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

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

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

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

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

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

  628.     }

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

  630. }

  631. 

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

  633. {

  634.     int i, j;

  635.     TM2_INIT_POINTERS_2();

  636. 

  637.     /* update chroma */

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

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

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

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

  642.         }

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

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

  645.     }

  646.     U -= Ustride * 2;

  647.     V -= Vstride * 2;

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

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

  650. 

  651.     /* update deltas */

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

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

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

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

  656. 

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

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

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

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

  661.         }

  662.         Y  += Ystride;

  663.         Yo += oYstride;

  664.     }

  665. }

  666. 

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

  668. {

  669.     int i, j;

  670.     int d;

  671.     TM2_INIT_POINTERS_2();

  672. 

  673.     /* update chroma */

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

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

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

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

  678.         }

  679.         U  += Ustride;

  680.         V  += Vstride;

  681.         Uo += oUstride;

  682.         Vo += oVstride;

  683.     }

  684.     U -= Ustride * 2;

  685.     V -= Vstride * 2;

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

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

  688. 

  689.     /* update deltas */

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

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

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

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

  694. 

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

  696.         d = last[3];

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

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

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

  700.         }

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

  702.         Y  += Ystride;

  703.         Yo += oYstride;

  704.     }

  705. }

  706. 

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

  708. {

  709.     int i, j;

  710.     int mx, my;

  711.     TM2_INIT_POINTERS_2();

  712. 

  713.     mx = GET_TOK(ctx, TM2_MOT);

  714.     my = GET_TOK(ctx, TM2_MOT);

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

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

  717. 

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

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

  720.         return;

  721.     }

  722. 

  723.     Yo += my * oYstride + mx;

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

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

  726. 

  727.     /* copy chroma */

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

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

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

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

  732.         }

  733.         U  += Ustride;

  734.         V  += Vstride;

  735.         Uo += oUstride;

  736.         Vo += oVstride;

  737.     }

  738.     U -= Ustride * 2;

  739.     V -= Vstride * 2;

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

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

  742. 

  743.     /* copy luma */

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

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

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

  747.         }

  748.         Y  += Ystride;

  749.         Yo += oYstride;

  750.     }

  751.     /* calculate deltas */

  752.     Y -= Ystride * 4;

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

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

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

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

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

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

  759. }

  760. 

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

  762. {

  763.     int i, j;

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

  765.     int type;

  766.     int keyframe = 1;

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

  768.     uint8_t *dst;

  769. 

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

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

  772. 

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

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

  775.         return AVERROR_INVALIDDATA;

  776.     }

  777. 

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

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

  780. 

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

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

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

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

  785.             type = GET_TOK(ctx, TM2_TYPE);

  786.             switch(type) {

  787.             case TM2_HI_RES:

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

  789.                 break;

  790.             case TM2_MED_RES:

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

  792.                 break;

  793.             case TM2_LOW_RES:

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

  795.                 break;

  796.             case TM2_NULL_RES:

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

  798.                 break;

  799.             case TM2_UPDATE:

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

  801.                 keyframe = 0;

  802.                 break;

  803.             case TM2_STILL:

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

  805.                 keyframe = 0;

  806.                 break;

  807.             case TM2_MOTION:

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

  809.                 keyframe = 0;

  810.                 break;

  811.             default:

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

  813.             }

  814.             if (ctx->error)

  815.                 return AVERROR_INVALIDDATA;

  816.         }

  817.     }

  818. 

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

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

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

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

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

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

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

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

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

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

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

  830.         }

  831. 

  832.         /* horizontal edge extension */

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

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

  835. 

  836.         /* vertical edge extension */

  837.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  847.         }

  848. 

  849.         Y += ctx->y_stride;

  850.         if (j & 1) {

  851.             /* horizontal edge extension */

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

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

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

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

  856. 

  857.             /* vertical edge extension */

  858.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  868.             }

  869. 

  870.             U += ctx->uv_stride;

  871.             V += ctx->uv_stride;

  872.         }

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

  874.     }

  875. 

  876.     return keyframe;

  877. }

  878. 

  879. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  881. };

  882. 

  883. #define TM2_HEADER_SIZE 40

  884. 

  885. static int decode_frame(AVCodecContext *avctx,

  886.                         void *data, int *got_frame,

  887.                         AVPacket *avpkt)

  888. {

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

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

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

  892.     AVFrame * const p    = l->pic;

  893.     int offset           = TM2_HEADER_SIZE;

  894.     int i, t, ret;

  895. 

  896.     l->error = 0;

  897. 

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

  899.     if (!l->buffer) {

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

  901.         return AVERROR(ENOMEM);

  902.     }

  903. 

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

  905.         return ret;

  906. 

  907.     l->bdsp.bswap_buf((uint32_t *) l->buffer, (const uint32_t *) buf,

  908.                       buf_size >> 2);

  909. 

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

  911.         return ret;

  912.     }

  913. 

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

  915.         if (offset >= buf_size) {

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

  917.             return AVERROR_INVALIDDATA;

  918.         }

  919. 

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

  921.                             buf_size - offset);

  922.         if (t < 0) {

  923.             int j = tm2_stream_order[i];

  924.             if (l->tok_lens[j])

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

  926.             return t;

  927.         }

  928.         offset += t;

  929.     }

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

  931.     if (p->key_frame)

  932.         p->pict_type = AV_PICTURE_TYPE_I;

  933.     else

  934.         p->pict_type = AV_PICTURE_TYPE_P;

  935. 

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

  937.     *got_frame      = 1;

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

  939. 

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

  941. }

  942. 

  943. static av_cold int decode_init(AVCodecContext *avctx)

  944. {

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

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

  947. 

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

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

  950.         return AVERROR(EINVAL);

  951.     }

  952. 

  953.     l->avctx       = avctx;

  954.     avctx->pix_fmt = AV_PIX_FMT_BGR24;

  955. 

  956.     l->pic = av_frame_alloc();

  957.     if (!l->pic)

  958.         return AVERROR(ENOMEM);

  959. 

  960.     ff_bswapdsp_init(&l->bdsp);

  961. 

  962.     l->last  = av_malloc_array(w >> 2, 4 * sizeof(*l->last) );

  963.     l->clast = av_malloc_array(w >> 2, 4 * sizeof(*l->clast));

  964. 

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

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

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

  968.     }

  969. 

  970.     w += 8;

  971.     h += 8;

  972.     l->Y1_base = av_calloc(w * h, sizeof(*l->Y1_base));

  973.     l->Y2_base = av_calloc(w * h, sizeof(*l->Y2_base));

  974.     l->y_stride = w;

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

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

  977.     l->U1_base = av_calloc(w * h, sizeof(*l->U1_base));

  978.     l->V1_base = av_calloc(w * h, sizeof(*l->V1_base));

  979.     l->U2_base = av_calloc(w * h, sizeof(*l->U2_base));

  980.     l->V2_base = av_calloc(w * h, sizeof(*l->V1_base));

  981.     l->uv_stride = w;

  982.     l->cur = 0;

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

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

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

  986.         av_freep(&l->Y1_base);

  987.         av_freep(&l->Y2_base);

  988.         av_freep(&l->U1_base);

  989.         av_freep(&l->U2_base);

  990.         av_freep(&l->V1_base);

  991.         av_freep(&l->V2_base);

  992.         av_freep(&l->last);

  993.         av_freep(&l->clast);

  994.         av_frame_free(&l->pic);

  995.         return AVERROR(ENOMEM);

  996.     }

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

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

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

  1000.     l->U2 = l->U2_base + l->uv_stride * 2 + 2;

  1001.     l->V1 = l->V1_base + l->uv_stride * 2 + 2;

  1002.     l->V2 = l->V2_base + l->uv_stride * 2 + 2;

  1003. 

  1004.     return 0;

  1005. }

  1006. 

  1007. static av_cold int decode_end(AVCodecContext *avctx)

  1008. {

  1009.     TM2Context * const l = avctx->priv_data;

  1010.     int i;

  1011. 

  1012.     av_free(l->last);

  1013.     av_free(l->clast);

  1014.     for (i = 0; i < TM2_NUM_STREAMS; i++)

  1015.         av_freep(&l->tokens[i]);

  1016.     if (l->Y1) {

  1017.         av_freep(&l->Y1_base);

  1018.         av_freep(&l->U1_base);

  1019.         av_freep(&l->V1_base);

  1020.         av_freep(&l->Y2_base);

  1021.         av_freep(&l->U2_base);

  1022.         av_freep(&l->V2_base);

  1023.     }

  1024.     av_freep(&l->buffer);

  1025.     l->buffer_size = 0;

  1026. 

  1027.     av_frame_free(&l->pic);

  1028. 

  1029.     return 0;

  1030. }

  1031. 

  1032. AVCodec ff_truemotion2_decoder = {

  1033.     .name           = "truemotion2",

  1034.     .long_name      = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),

  1035.     .type           = AVMEDIA_TYPE_VIDEO,

  1036.     .id             = AV_CODEC_ID_TRUEMOTION2,

  1037.     .priv_data_size = sizeof(TM2Context),

  1038.     .init           = decode_init,

  1039.     .close          = decode_end,

  1040.     .decode         = decode_frame,

  1041.     .capabilities   = AV_CODEC_CAP_DR1,

  1042. };