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FFmpeg/libavcodec/truemotion2.c

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  1. /*

  2.  * Duck/ON2 TrueMotion 2 Decoder

  3.  * Copyright (c) 2005 Konstantin Shishkov

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * Duck TrueMotion2 decoder.

  25.  */

  26. 

  27. #include <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.     BswapDSPContext bdsp;

  67. 

  68.     /* TM2 streams */

  69.     int *tokens[TM2_NUM_STREAMS];

  70.     int tok_lens[TM2_NUM_STREAMS];

  71.     int tok_ptrs[TM2_NUM_STREAMS];

  72.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  73.     /* for blocks decoding */

  74.     int D[4];

  75.     int CD[4];

  76.     int *last;

  77.     int *clast;

  78. 

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

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

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

  82.     int y_stride, uv_stride;

  83.     int cur;

  84. } TM2Context;

  85. 

  86. /**

  87. * Huffman codes for each of streams

  88. */

  89. typedef struct TM2Codes {

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

  91.     int bits;

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

  93.     int length;

  94. } TM2Codes;

  95. 

  96. /**

  97. * structure for gathering Huffman codes information

  98. */

  99. typedef struct TM2Huff {

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

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

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

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

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

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

  106.     int *nums; ///< literals

  107.     uint32_t *bits; ///< codes

  108.     int *lens; ///< codelengths

  109. } TM2Huff;

  110. 

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

  112. {

  113.     int ret;

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

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

  116.                huff->max_bits);

  117.         return AVERROR_INVALIDDATA;

  118.     }

  119. 

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

  121.         if (length == 0) {

  122.             length = 1;

  123.         }

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

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

  126.             return AVERROR_INVALIDDATA;

  127.         }

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

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

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

  131.         huff->num++;

  132.         return 0;

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

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

  135.             return ret;

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

  137.             return ret;

  138.     }

  139.     return 0;

  140. }

  141. 

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

  143. {

  144.     TM2Huff huff;

  145.     int res = 0;

  146. 

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

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

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

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

  151.     huff.num      = 0;

  152. 

  153.     /* check for correct codes parameters */

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

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

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

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

  158.         return AVERROR_INVALIDDATA;

  159.     }

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

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

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

  163.         return AVERROR_INVALIDDATA;

  164.     }

  165.     /* one-node tree */

  166.     if (huff.max_bits == 0)

  167.         huff.max_bits = 1;

  168. 

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

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

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

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

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

  174. 

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

  176. 

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

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

  179.                huff.num, huff.max_num);

  180.         res = AVERROR_INVALIDDATA;

  181.     }

  182. 

  183.     /* convert codes to vlc_table */

  184.     if (res >= 0) {

  185.         int i;

  186. 

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

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

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

  190.         if (res < 0)

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

  192.         else {

  193.             code->bits = huff.max_bits;

  194.             code->length = huff.max_num;

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

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

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

  198.         }

  199.     }

  200.     /* free allocated memory */

  201.     av_free(huff.nums);

  202.     av_free(huff.bits);

  203.     av_free(huff.lens);

  204. 

  205.     return res;

  206. }

  207. 

  208. static void tm2_free_codes(TM2Codes *code)

  209. {

  210.     av_free(code->recode);

  211.     if (code->vlc.table)

  212.         ff_free_vlc(&code->vlc);

  213. }

  214. 

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

  216. {

  217.     int val;

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

  219.     return code->recode[val];

  220. }

  221. 

  222. #define TM2_OLD_HEADER_MAGIC 0x00000100

  223. #define TM2_NEW_HEADER_MAGIC 0x00000101

  224. 

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

  226. {

  227.     uint32_t magic = AV_RL32(buf);

  228. 

  229.     switch (magic) {

  230.     case TM2_OLD_HEADER_MAGIC:

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

  232.         return 0;

  233.     case TM2_NEW_HEADER_MAGIC:

  234.         return 0;

  235.     default:

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

  237.                magic);

  238.         return AVERROR_INVALIDDATA;

  239.     }

  240. }

  241. 

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

  243. {

  244.     int d, mb;

  245.     int i, v;

  246. 

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

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

  249. 

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

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

  252.         return AVERROR_INVALIDDATA;

  253.     }

  254. 

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

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

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

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

  259.         else

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

  261.     }

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

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

  264. 

  265.     return 0;

  266. }

  267. 

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

  269. {

  270.     int i, ret;

  271.     int skip = 0;

  272.     int len, toks, pos;

  273.     TM2Codes codes;

  274.     GetByteContext gb;

  275. 

  276.     /* get stream length in dwords */

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

  278.     len  = bytestream2_get_be32(&gb);

  279.     skip = len * 4 + 4;

  280. 

  281.     if (len == 0)

  282.         return 4;

  283. 

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

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

  286.         return AVERROR_INVALIDDATA;

  287.     }

  288. 

  289.     toks = bytestream2_get_be32(&gb);

  290.     if (toks & 1) {

  291.         len = bytestream2_get_be32(&gb);

  292.         if (len == TM2_ESCAPE) {

  293.             len = bytestream2_get_be32(&gb);

  294.         }

  295.         if (len > 0) {

  296.             pos = bytestream2_tell(&gb);

  297.             if (skip <= pos)

  298.                 return AVERROR_INVALIDDATA;

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

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

  301.                 return ret;

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

  303.         }

  304.     }

  305.     /* skip unused fields */

  306.     len = bytestream2_get_be32(&gb);

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

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

  309.     } else {

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

  311.     }

  312. 

  313.     pos = bytestream2_tell(&gb);

  314.     if (skip <= pos)

  315.         return AVERROR_INVALIDDATA;

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

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

  318.         return ret;

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

  320. 

  321.     toks >>= 1;

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

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

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

  325.         tm2_free_codes(&codes);

  326.         return AVERROR_INVALIDDATA;

  327.     }

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

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

  330.     len = bytestream2_get_be32(&gb);

  331.     if (len > 0) {

  332.         pos = bytestream2_tell(&gb);

  333.         if (skip <= pos)

  334.             return AVERROR_INVALIDDATA;

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

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

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

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

  339.                 return AVERROR_INVALIDDATA;

  340.             }

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

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

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

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

  345.                 return AVERROR_INVALIDDATA;

  346.             }

  347.         }

  348.     } else {

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

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

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

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

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

  354.                 return AVERROR_INVALIDDATA;

  355.             }

  356.         }

  357.     }

  358.     tm2_free_codes(&codes);

  359. 

  360.     return skip;

  361. }

  362. 

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

  364. {

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

  366.         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]);

  367.         return 0;

  368.     }

  369.     if (type <= TM2_MOT)

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

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

  372. }

  373. 

  374. /* blocks decoding routines */

  375. 

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

  377. #define TM2_INIT_POINTERS() \

  378.     int *last, *clast; \

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

  380.     int Ystride, Ustride, Vstride;\

  381. \

  382.     Ystride = ctx->y_stride;\

  383.     Vstride = ctx->uv_stride;\

  384.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  390. 

  391. #define TM2_INIT_POINTERS_2() \

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

  393.     int oYstride, oUstride, oVstride;\

  394. \

  395.     TM2_INIT_POINTERS();\

  396.     oYstride = Ystride;\

  397.     oVstride = Vstride;\

  398.     oUstride = Ustride;\

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

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

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

  402. 

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

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

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

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

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

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

  409. 

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

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

  412. {

  413.     int ct, d;

  414.     int i, j;

  415. 

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

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

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

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

  420.             ct      += d;

  421.             last[i] += ct;

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

  423.         }

  424.         Y        += stride;

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

  426.     }

  427. }

  428. 

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

  430. {

  431.     int i, j;

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

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

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

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

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

  437.         }

  438.         data += stride;

  439.     }

  440. }

  441. 

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

  443. {

  444.     int t;

  445.     int l;

  446.     int prev;

  447. 

  448.     if (bx > 0)

  449.         prev = clast[-3];

  450.     else

  451.         prev = 0;

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

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

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

  455.     CD[0]    = t;

  456.     clast[0] = l;

  457. 

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

  459. }

  460. 

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

  462. {

  463.     int i;

  464.     int deltas[16];

  465.     TM2_INIT_POINTERS();

  466. 

  467.     /* hi-res chroma */

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

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

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

  471.     }

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

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

  474. 

  475.     /* hi-res luma */

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

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

  478. 

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

  480. }

  481. 

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

  483. {

  484.     int i;

  485.     int deltas[16];

  486.     TM2_INIT_POINTERS();

  487. 

  488.     /* low-res chroma */

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

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

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

  492. 

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

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

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

  496. 

  497.     /* hi-res luma */

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

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

  500. 

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

  502. }

  503. 

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

  505. {

  506.     int i;

  507.     int t1, t2;

  508.     int deltas[16];

  509.     TM2_INIT_POINTERS();

  510. 

  511.     /* low-res chroma */

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

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

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

  515. 

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

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

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

  519. 

  520.     /* low-res luma */

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

  522.         deltas[i] = 0;

  523. 

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

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

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

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

  528. 

  529.     if (bx > 0)

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

  531.     else

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

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

  534. 

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

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

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

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

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

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

  541. 

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

  543. }

  544. 

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

  546. {

  547.     int i;

  548.     int ct;

  549.     int left, right, diff;

  550.     int deltas[16];

  551.     TM2_INIT_POINTERS();

  552. 

  553.     /* null chroma */

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

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

  556. 

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

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

  559. 

  560.     /* null luma */

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

  562.         deltas[i] = 0;

  563. 

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

  565. 

  566.     if (bx > 0)

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

  568.     else

  569.         left = 0;

  570. 

  571.     right   = last[3];

  572.     diff    = right - left;

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

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

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

  576.     last[3] = right;

  577.     {

  578.         int tp = left;

  579. 

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

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

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

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

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

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

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

  587.     }

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

  589. }

  590. 

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

  592. {

  593.     int i, j;

  594.     TM2_INIT_POINTERS_2();

  595. 

  596.     /* update chroma */

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

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

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

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

  601.         }

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

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

  604.     }

  605.     U -= Ustride * 2;

  606.     V -= Vstride * 2;

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

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

  609. 

  610.     /* update deltas */

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

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

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

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

  615. 

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

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

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

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

  620.         }

  621.         Y  += Ystride;

  622.         Yo += oYstride;

  623.     }

  624. }

  625. 

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

  627. {

  628.     int i, j;

  629.     int d;

  630.     TM2_INIT_POINTERS_2();

  631. 

  632.     /* update chroma */

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

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

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

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

  637.         }

  638.         U  += Ustride;

  639.         V  += Vstride;

  640.         Uo += oUstride;

  641.         Vo += oVstride;

  642.     }

  643.     U -= Ustride * 2;

  644.     V -= Vstride * 2;

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

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

  647. 

  648.     /* update deltas */

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

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

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

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

  653. 

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

  655.         d = last[3];

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

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

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

  659.         }

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

  661.         Y  += Ystride;

  662.         Yo += oYstride;

  663.     }

  664. }

  665. 

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

  667. {

  668.     int i, j;

  669.     int mx, my;

  670.     TM2_INIT_POINTERS_2();

  671. 

  672.     mx = GET_TOK(ctx, TM2_MOT);

  673.     my = GET_TOK(ctx, TM2_MOT);

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

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

  676. 

  677.     Yo += my * oYstride + mx;

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

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

  680. 

  681.     /* copy chroma */

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

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

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

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

  686.         }

  687.         U  += Ustride;

  688.         V  += Vstride;

  689.         Uo += oUstride;

  690.         Vo += oVstride;

  691.     }

  692.     U -= Ustride * 2;

  693.     V -= Vstride * 2;

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

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

  696. 

  697.     /* copy luma */

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

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

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

  701.         }

  702.         Y  += Ystride;

  703.         Yo += oYstride;

  704.     }

  705.     /* calculate deltas */

  706.     Y -= Ystride * 4;

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

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

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

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

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

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

  713. }

  714. 

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

  716. {

  717.     int i, j;

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

  719.     int type;

  720.     int keyframe = 1;

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

  722.     uint8_t *dst;

  723. 

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

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

  726. 

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

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

  729.         return AVERROR_INVALIDDATA;

  730.     }

  731. 

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

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

  734. 

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

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

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

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

  739.             type = GET_TOK(ctx, TM2_TYPE);

  740.             switch(type) {

  741.             case TM2_HI_RES:

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

  743.                 break;

  744.             case TM2_MED_RES:

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

  746.                 break;

  747.             case TM2_LOW_RES:

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

  749.                 break;

  750.             case TM2_NULL_RES:

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

  752.                 break;

  753.             case TM2_UPDATE:

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

  755.                 keyframe = 0;

  756.                 break;

  757.             case TM2_STILL:

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

  759.                 keyframe = 0;

  760.                 break;

  761.             case TM2_MOTION:

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

  763.                 keyframe = 0;

  764.                 break;

  765.             default:

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

  767.             }

  768.         }

  769.     }

  770. 

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

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

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

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

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

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

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

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

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

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

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

  782.         }

  783. 

  784.         /* horizontal edge extension */

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

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

  787. 

  788.         /* vertical edge extension */

  789.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  799.         }

  800. 

  801.         Y += ctx->y_stride;

  802.         if (j & 1) {

  803.             /* horizontal edge extension */

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

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

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

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

  808. 

  809.             /* vertical edge extension */

  810.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  820.             }

  821. 

  822.             U += ctx->uv_stride;

  823.             V += ctx->uv_stride;

  824.         }

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

  826.     }

  827. 

  828.     return keyframe;

  829. }

  830. 

  831. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  833. };

  834. 

  835. #define TM2_HEADER_SIZE 40

  836. 

  837. static int decode_frame(AVCodecContext *avctx,

  838.                         void *data, int *got_frame,

  839.                         AVPacket *avpkt)

  840. {

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

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

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

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

  845.     int offset           = TM2_HEADER_SIZE;

  846.     int i, t, ret;

  847.     uint8_t *swbuf;

  848. 

  849.     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  850.     if (!swbuf) {

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

  852.         return AVERROR(ENOMEM);

  853.     }

  854. 

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

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

  857.         av_free(swbuf);

  858.         return ret;

  859.     }

  860. 

  861.     l->bdsp.bswap_buf((uint32_t *) swbuf, (const uint32_t *) buf,

  862.                       buf_size >> 2);

  863. 

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

  865.         av_free(swbuf);

  866.         return ret;

  867.     }

  868. 

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

  870.         if (offset >= buf_size) {

  871.             av_free(swbuf);

  872.             return AVERROR_INVALIDDATA;

  873.         }

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

  875.                             buf_size - offset);

  876.         if (t < 0) {

  877.             av_free(swbuf);

  878.             return t;

  879.         }

  880.         offset += t;

  881.     }

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

  883.     if (p->key_frame)

  884.         p->pict_type = AV_PICTURE_TYPE_I;

  885.     else

  886.         p->pict_type = AV_PICTURE_TYPE_P;

  887. 

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

  889.     *got_frame      = 1;

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

  891.     av_free(swbuf);

  892. 

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

  894. }

  895. 

  896. static av_cold int decode_init(AVCodecContext *avctx)

  897. {

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

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

  900. 

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

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

  903.         return AVERROR(EINVAL);

  904.     }

  905. 

  906.     l->avctx       = avctx;

  907.     avctx->pix_fmt = AV_PIX_FMT_BGR24;

  908. 

  909.     l->pic = av_frame_alloc();

  910.     if (!l->pic)

  911.         return AVERROR(ENOMEM);

  912. 

  913.     ff_bswapdsp_init(&l->bdsp);

  914. 

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

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

  917. 

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

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

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

  921.     }

  922. 

  923.     w += 8;

  924.     h += 8;

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

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

  927.     l->y_stride = w;

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

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

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

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

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

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

  934.     l->uv_stride = w;

  935.     l->cur = 0;

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

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

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

  939.         av_freep(&l->Y1_base);

  940.         av_freep(&l->Y2_base);

  941.         av_freep(&l->U1_base);

  942.         av_freep(&l->U2_base);

  943.         av_freep(&l->V1_base);

  944.         av_freep(&l->V2_base);

  945.         av_freep(&l->last);

  946.         av_freep(&l->clast);

  947.         return AVERROR(ENOMEM);

  948.     }

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

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

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

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

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

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

  955. 

  956.     return 0;

  957. }

  958. 

  959. static av_cold int decode_end(AVCodecContext *avctx)

  960. {

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

  962.     int i;

  963. 

  964.     av_free(l->last);

  965.     av_free(l->clast);

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

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

  968.     if (l->Y1) {

  969.         av_free(l->Y1_base);

  970.         av_free(l->U1_base);

  971.         av_free(l->V1_base);

  972.         av_free(l->Y2_base);

  973.         av_free(l->U2_base);

  974.         av_free(l->V2_base);

  975.     }

  976. 

  977.     av_frame_free(&l->pic);

  978. 

  979.     return 0;

  980. }

  981. 

  982. AVCodec ff_truemotion2_decoder = {

  983.     .name           = "truemotion2",

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

  985.     .type           = AVMEDIA_TYPE_VIDEO,

  986.     .id             = AV_CODEC_ID_TRUEMOTION2,

  987.     .priv_data_size = sizeof(TM2Context),

  988.     .init           = decode_init,

  989.     .close          = decode_end,

  990.     .decode         = decode_frame,

  991.     .capabilities   = CODEC_CAP_DR1,

  992. };