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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. /**

  116.  *

  117.  * @returns the length of the longest code or an AVERROR code

  118.  */

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

  120. {

  121.     int ret, ret2;

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

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

  124.                huff->max_bits);

  125.         return AVERROR_INVALIDDATA;

  126.     }

  127. 

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

  129.         if (length == 0) {

  130.             length = 1;

  131.         }

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

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

  134.             return AVERROR_INVALIDDATA;

  135.         }

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

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

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

  139.         huff->num++;

  140.         return length;

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

  142.         if ((ret2 = tm2_read_tree(ctx, prefix << 1, length + 1, huff)) < 0)

  143.             return ret2;

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

  145.             return ret;

  146.     }

  147.     return FFMAX(ret, ret2);

  148. }

  149. 

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

  151. {

  152.     TM2Huff huff;

  153.     int res = 0;

  154. 

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

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

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

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

  159.     huff.num      = 0;

  160. 

  161.     /* check for correct codes parameters */

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

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

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

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

  166.         return AVERROR_INVALIDDATA;

  167.     }

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

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

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

  171.         return AVERROR_INVALIDDATA;

  172.     }

  173.     /* one-node tree */

  174.     if (huff.max_bits == 0)

  175.         huff.max_bits = 1;

  176. 

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

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

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

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

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

  182. 

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

  184.         res = AVERROR(ENOMEM);

  185.         goto out;

  186.     }

  187. 

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

  189. 

  190.     if (res >= 0 && res != huff.max_bits) {

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

  192.                res, huff.max_bits);

  193.         res = AVERROR_INVALIDDATA;

  194.     }

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

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

  197.                huff.num, huff.max_num);

  198.         res = AVERROR_INVALIDDATA;

  199.     }

  200. 

  201.     /* convert codes to vlc_table */

  202.     if (res >= 0) {

  203.         int i;

  204. 

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

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

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

  208.         if (res < 0)

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

  210.         else {

  211.             code->bits = huff.max_bits;

  212.             code->length = huff.max_num;

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

  214.             if (!code->recode) {

  215.                 res = AVERROR(ENOMEM);

  216.                 goto out;

  217.             }

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

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

  220.         }

  221.     }

  222. 

  223. out:

  224.     /* free allocated memory */

  225.     av_free(huff.nums);

  226.     av_free(huff.bits);

  227.     av_free(huff.lens);

  228. 

  229.     return res;

  230. }

  231. 

  232. static void tm2_free_codes(TM2Codes *code)

  233. {

  234.     av_free(code->recode);

  235.     if (code->vlc.table)

  236.         ff_free_vlc(&code->vlc);

  237. }

  238. 

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

  240. {

  241.     int val;

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

  243.     if(val<0)

  244.         return -1;

  245.     return code->recode[val];

  246. }

  247. 

  248. #define TM2_OLD_HEADER_MAGIC 0x00000100

  249. #define TM2_NEW_HEADER_MAGIC 0x00000101

  250. 

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

  252. {

  253.     uint32_t magic = AV_RL32(buf);

  254. 

  255.     switch (magic) {

  256.     case TM2_OLD_HEADER_MAGIC:

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

  258.         return 0;

  259.     case TM2_NEW_HEADER_MAGIC:

  260.         return 0;

  261.     default:

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

  263.                magic);

  264.         return AVERROR_INVALIDDATA;

  265.     }

  266. }

  267. 

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

  269. {

  270.     int d, mb;

  271.     int i, v;

  272. 

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

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

  275. 

  276.     av_assert2(mb < 32);

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

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

  279.         return AVERROR_INVALIDDATA;

  280.     }

  281. 

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

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

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

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

  286.         else

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

  288.     }

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

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

  291. 

  292.     return 0;

  293. }

  294. 

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

  296. {

  297.     int i, ret;

  298.     int skip = 0;

  299.     int len, toks, pos;

  300.     TM2Codes codes;

  301.     GetByteContext gb;

  302. 

  303.     if (buf_size < 4) {

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

  305.         return AVERROR_INVALIDDATA;

  306.     }

  307. 

  308.     /* get stream length in dwords */

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

  310.     len  = bytestream2_get_be32(&gb);

  311. 

  312.     if (len == 0)

  313.         return 4;

  314. 

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

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

  317.         return AVERROR_INVALIDDATA;

  318.     }

  319.     skip = len * 4 + 4;

  320. 

  321.     toks = bytestream2_get_be32(&gb);

  322.     if (toks & 1) {

  323.         len = bytestream2_get_be32(&gb);

  324.         if (len == TM2_ESCAPE) {

  325.             len = bytestream2_get_be32(&gb);

  326.         }

  327.         if (len > 0) {

  328.             pos = bytestream2_tell(&gb);

  329.             if (skip <= pos)

  330.                 return AVERROR_INVALIDDATA;

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

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

  333.                 return ret;

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

  335.         }

  336.     }

  337.     /* skip unused fields */

  338.     len = bytestream2_get_be32(&gb);

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

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

  341.     } else {

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

  343.     }

  344. 

  345.     pos = bytestream2_tell(&gb);

  346.     if (skip <= pos)

  347.         return AVERROR_INVALIDDATA;

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

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

  350.         return ret;

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

  352. 

  353.     toks >>= 1;

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

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

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

  357.         ret = AVERROR_INVALIDDATA;

  358.         goto end;

  359.     }

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

  361.     if (ret < 0) {

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

  363.         goto end;

  364.     }

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

  366.     len = bytestream2_get_be32(&gb);

  367.     if (len > 0) {

  368.         pos = bytestream2_tell(&gb);

  369.         if (skip <= pos) {

  370.             ret = AVERROR_INVALIDDATA;

  371.             goto end;

  372.         }

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

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

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

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

  377.                 ret = AVERROR_INVALIDDATA;

  378.                 goto end;

  379.             }

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

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

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

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

  384.                 ret = AVERROR_INVALIDDATA;

  385.                 goto end;

  386.             }

  387.         }

  388.     } else {

  389.         if (len < 0) {

  390.             ret = AVERROR_INVALIDDATA;

  391.             goto end;

  392.         }

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

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

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

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

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

  398.                 ret = AVERROR_INVALIDDATA;

  399.                 goto end;

  400.             }

  401.         }

  402.     }

  403. 

  404.     ret = skip;

  405. 

  406. end:

  407.     tm2_free_codes(&codes);

  408.     return ret;

  409. }

  410. 

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

  412. {

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

  414.         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]);

  415.         ctx->error = 1;

  416.         return 0;

  417.     }

  418.     if (type <= TM2_MOT) {

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

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

  421.             return 0;

  422.         }

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

  424.     }

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

  426. }

  427. 

  428. /* blocks decoding routines */

  429. 

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

  431. #define TM2_INIT_POINTERS() \

  432.     int *last, *clast; \

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

  434.     int Ystride, Ustride, Vstride;\

  435. \

  436.     Ystride = ctx->y_stride;\

  437.     Vstride = ctx->uv_stride;\

  438.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  444. 

  445. #define TM2_INIT_POINTERS_2() \

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

  447.     int oYstride, oUstride, oVstride;\

  448. \

  449.     TM2_INIT_POINTERS();\

  450.     oYstride = Ystride;\

  451.     oVstride = Vstride;\

  452.     oUstride = Ustride;\

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

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

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

  456. 

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

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

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

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

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

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

  463. 

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

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

  466. {

  467.     unsigned ct, d;

  468.     int i, j;

  469. 

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

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

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

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

  474.             ct      += d;

  475.             last[i] += ct;

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

  477.         }

  478.         Y        += stride;

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

  480.     }

  481. }

  482. 

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

  484. {

  485.     int i, j;

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

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

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

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

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

  491.         }

  492.         data += stride;

  493.     }

  494. }

  495. 

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

  497. {

  498.     int t;

  499.     int l;

  500.     int prev;

  501. 

  502.     if (bx > 0)

  503.         prev = clast[-3];

  504.     else

  505.         prev = 0;

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

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

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

  509.     CD[0]    = t;

  510.     clast[0] = l;

  511. 

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

  513. }

  514. 

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

  516. {

  517.     int i;

  518.     int deltas[16];

  519.     TM2_INIT_POINTERS();

  520. 

  521.     /* hi-res chroma */

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

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

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

  525.     }

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

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

  528. 

  529.     /* hi-res luma */

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

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

  532. 

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

  534. }

  535. 

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

  537. {

  538.     int i;

  539.     int deltas[16];

  540.     TM2_INIT_POINTERS();

  541. 

  542.     /* low-res chroma */

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

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

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

  546. 

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

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

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

  550. 

  551.     /* hi-res luma */

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

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

  554. 

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

  556. }

  557. 

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

  559. {

  560.     int i;

  561.     int t1, t2;

  562.     int deltas[16];

  563.     TM2_INIT_POINTERS();

  564. 

  565.     /* low-res chroma */

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

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

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

  569. 

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

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

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

  573. 

  574.     /* low-res luma */

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

  576.         deltas[i] = 0;

  577. 

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

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

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

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

  582. 

  583.     if (bx > 0)

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

  585.     else

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

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

  588. 

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

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

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

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

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

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

  595. 

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

  597. }

  598. 

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

  600. {

  601.     int i;

  602.     int ct;

  603.     unsigned left, right;

  604.     int diff;

  605.     int deltas[16];

  606.     TM2_INIT_POINTERS();

  607. 

  608.     /* null chroma */

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

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

  611. 

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

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

  614. 

  615.     /* null luma */

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

  617.         deltas[i] = 0;

  618. 

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

  620. 

  621.     if (bx > 0)

  622.         left = last[-1] - (unsigned)ct;

  623.     else

  624.         left = 0;

  625. 

  626.     right   = last[3];

  627.     diff    = right - left;

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

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

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

  631.     last[3] = right;

  632.     {

  633.         unsigned tp = left;

  634. 

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

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

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

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

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

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

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

  642.     }

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

  644. }

  645. 

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

  647. {

  648.     int i, j;

  649.     TM2_INIT_POINTERS_2();

  650. 

  651.     /* update chroma */

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

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

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

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

  656.         }

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

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

  659.     }

  660.     U -= Ustride * 2;

  661.     V -= Vstride * 2;

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

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

  664. 

  665.     /* update deltas */

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

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

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

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

  670. 

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

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

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

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

  675.         }

  676.         Y  += Ystride;

  677.         Yo += oYstride;

  678.     }

  679. }

  680. 

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

  682. {

  683.     int i, j;

  684.     unsigned d;

  685.     TM2_INIT_POINTERS_2();

  686. 

  687.     /* update chroma */

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

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

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

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

  692.         }

  693.         U  += Ustride;

  694.         V  += Vstride;

  695.         Uo += oUstride;

  696.         Vo += oVstride;

  697.     }

  698.     U -= Ustride * 2;

  699.     V -= Vstride * 2;

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

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

  702. 

  703.     /* update deltas */

  704.     ctx->D[0] = (unsigned)Yo[3] - last[3];

  705.     ctx->D[1] = (unsigned)Yo[3 + oYstride] - Yo[3];

  706.     ctx->D[2] = (unsigned)Yo[3 + oYstride * 2] - Yo[3 + oYstride];

  707.     ctx->D[3] = (unsigned)Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];

  708. 

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

  710.         d = last[3];

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

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

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

  714.         }

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

  716.         Y  += Ystride;

  717.         Yo += oYstride;

  718.     }

  719. }

  720. 

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

  722. {

  723.     int i, j;

  724.     int mx, my;

  725.     TM2_INIT_POINTERS_2();

  726. 

  727.     mx = GET_TOK(ctx, TM2_MOT);

  728.     my = GET_TOK(ctx, TM2_MOT);

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

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

  731. 

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

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

  734.         return;

  735.     }

  736. 

  737.     Yo += my * oYstride + mx;

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

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

  740. 

  741.     /* copy chroma */

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

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

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

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

  746.         }

  747.         U  += Ustride;

  748.         V  += Vstride;

  749.         Uo += oUstride;

  750.         Vo += oVstride;

  751.     }

  752.     U -= Ustride * 2;

  753.     V -= Vstride * 2;

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

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

  756. 

  757.     /* copy luma */

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

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

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

  761.         }

  762.         Y  += Ystride;

  763.         Yo += oYstride;

  764.     }

  765.     /* calculate deltas */

  766.     Y -= Ystride * 4;

  767.     ctx->D[0] = (unsigned)Y[3] - last[3];

  768.     ctx->D[1] = (unsigned)Y[3 + Ystride] - Y[3];

  769.     ctx->D[2] = (unsigned)Y[3 + Ystride * 2] - Y[3 + Ystride];

  770.     ctx->D[3] = (unsigned)Y[3 + Ystride * 3] - Y[3 + Ystride * 2];

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

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

  773. }

  774. 

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

  776. {

  777.     int i, j;

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

  779.     int type;

  780.     int keyframe = 1;

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

  782.     uint8_t *dst;

  783. 

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

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

  786. 

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

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

  789.         return AVERROR_INVALIDDATA;

  790.     }

  791. 

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

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

  794. 

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

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

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

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

  799.             type = GET_TOK(ctx, TM2_TYPE);

  800.             switch(type) {

  801.             case TM2_HI_RES:

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

  803.                 break;

  804.             case TM2_MED_RES:

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

  806.                 break;

  807.             case TM2_LOW_RES:

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

  809.                 break;

  810.             case TM2_NULL_RES:

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

  812.                 break;

  813.             case TM2_UPDATE:

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

  815.                 keyframe = 0;

  816.                 break;

  817.             case TM2_STILL:

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

  819.                 keyframe = 0;

  820.                 break;

  821.             case TM2_MOTION:

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

  823.                 keyframe = 0;

  824.                 break;

  825.             default:

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

  827.             }

  828.             if (ctx->error)

  829.                 return AVERROR_INVALIDDATA;

  830.         }

  831.     }

  832. 

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

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

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

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

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

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

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

  840.             unsigned y = Y[i], u = U[i >> 1], v = V[i >> 1];

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

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

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

  844.         }

  845. 

  846.         /* horizontal edge extension */

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

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

  849. 

  850.         /* vertical edge extension */

  851.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  861.         }

  862. 

  863.         Y += ctx->y_stride;

  864.         if (j & 1) {

  865.             /* horizontal edge extension */

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

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

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

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

  870. 

  871.             /* vertical edge extension */

  872.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  882.             }

  883. 

  884.             U += ctx->uv_stride;

  885.             V += ctx->uv_stride;

  886.         }

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

  888.     }

  889. 

  890.     return keyframe;

  891. }

  892. 

  893. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  895. };

  896. 

  897. #define TM2_HEADER_SIZE 40

  898. 

  899. static int decode_frame(AVCodecContext *avctx,

  900.                         void *data, int *got_frame,

  901.                         AVPacket *avpkt)

  902. {

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

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

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

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

  907.     int offset           = TM2_HEADER_SIZE;

  908.     int i, t, ret;

  909. 

  910.     l->error = 0;

  911. 

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

  913.     if (!l->buffer) {

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

  915.         return AVERROR(ENOMEM);

  916.     }

  917. 

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

  919.         return ret;

  920. 

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

  922.                       buf_size >> 2);

  923. 

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

  925.         return ret;

  926.     }

  927. 

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

  929.         if (offset >= buf_size) {

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

  931.             return AVERROR_INVALIDDATA;

  932.         }

  933. 

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

  935.                             buf_size - offset);

  936.         if (t < 0) {

  937.             int j = tm2_stream_order[i];

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

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

  940.             return t;

  941.         }

  942.         offset += t;

  943.     }

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

  945.     if (p->key_frame)

  946.         p->pict_type = AV_PICTURE_TYPE_I;

  947.     else

  948.         p->pict_type = AV_PICTURE_TYPE_P;

  949. 

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

  951.     *got_frame      = 1;

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

  953. 

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

  955. }

  956. 

  957. static av_cold int decode_init(AVCodecContext *avctx)

  958. {

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

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

  961. 

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

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

  964.         return AVERROR(EINVAL);

  965.     }

  966. 

  967.     l->avctx       = avctx;

  968.     avctx->pix_fmt = AV_PIX_FMT_BGR24;

  969. 

  970.     l->pic = av_frame_alloc();

  971.     if (!l->pic)

  972.         return AVERROR(ENOMEM);

  973. 

  974.     ff_bswapdsp_init(&l->bdsp);

  975. 

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

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

  978. 

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

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

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

  982.     }

  983. 

  984.     w += 8;

  985.     h += 8;

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

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

  988.     l->y_stride = w;

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

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

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

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

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

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

  995.     l->uv_stride = w;

  996.     l->cur = 0;

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

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

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

  1000.         av_freep(&l->Y1_base);

  1001.         av_freep(&l->Y2_base);

  1002.         av_freep(&l->U1_base);

  1003.         av_freep(&l->U2_base);

  1004.         av_freep(&l->V1_base);

  1005.         av_freep(&l->V2_base);

  1006.         av_freep(&l->last);

  1007.         av_freep(&l->clast);

  1008.         av_frame_free(&l->pic);

  1009.         return AVERROR(ENOMEM);

  1010.     }

  1011.     l->Y1 = l->Y1_base + l->y_stride  * 4 + 4;

  1012.     l->Y2 = l->Y2_base + l->y_stride  * 4 + 4;

  1013.     l->U1 = l->U1_base + l->uv_stride * 2 + 2;

  1014.     l->U2 = l->U2_base + l->uv_stride * 2 + 2;

  1015.     l->V1 = l->V1_base + l->uv_stride * 2 + 2;

  1016.     l->V2 = l->V2_base + l->uv_stride * 2 + 2;

  1017. 

  1018.     return 0;

  1019. }

  1020. 

  1021. static av_cold int decode_end(AVCodecContext *avctx)

  1022. {

  1023.     TM2Context * const l = avctx->priv_data;

  1024.     int i;

  1025. 

  1026.     av_free(l->last);

  1027.     av_free(l->clast);

  1028.     for (i = 0; i < TM2_NUM_STREAMS; i++)

  1029.         av_freep(&l->tokens[i]);

  1030.     if (l->Y1) {

  1031.         av_freep(&l->Y1_base);

  1032.         av_freep(&l->U1_base);

  1033.         av_freep(&l->V1_base);

  1034.         av_freep(&l->Y2_base);

  1035.         av_freep(&l->U2_base);

  1036.         av_freep(&l->V2_base);

  1037.     }

  1038.     av_freep(&l->buffer);

  1039.     l->buffer_size = 0;

  1040. 

  1041.     av_frame_free(&l->pic);

  1042. 

  1043.     return 0;

  1044. }

  1045. 

  1046. AVCodec ff_truemotion2_decoder = {

  1047.     .name           = "truemotion2",

  1048.     .long_name      = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),

  1049.     .type           = AVMEDIA_TYPE_VIDEO,

  1050.     .id             = AV_CODEC_ID_TRUEMOTION2,

  1051.     .priv_data_size = sizeof(TM2Context),

  1052.     .init           = decode_init,

  1053.     .close          = decode_end,

  1054.     .decode         = decode_frame,

  1055.     .capabilities   = AV_CODEC_CAP_DR1,

  1056. };