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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 "bitstream.h"

  31. #include "bswapdsp.h"

  32. #include "bytestream.h"

  33. #include "internal.h"

  34. #include "vlc.h"

  35. 

  36. #define TM2_ESCAPE 0x80000000

  37. #define TM2_DELTAS 64

  38. 

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

  40. enum TM2_STREAMS {

  41.     TM2_C_HI = 0,

  42.     TM2_C_LO,

  43.     TM2_L_HI,

  44.     TM2_L_LO,

  45.     TM2_UPD,

  46.     TM2_MOT,

  47.     TM2_TYPE,

  48.     TM2_NUM_STREAMS

  49. };

  50. 

  51. /* Block types */

  52. enum TM2_BLOCKS {

  53.     TM2_HI_RES = 0,

  54.     TM2_MED_RES,

  55.     TM2_LOW_RES,

  56.     TM2_NULL_RES,

  57.     TM2_UPDATE,

  58.     TM2_STILL,

  59.     TM2_MOTION

  60. };

  61. 

  62. typedef struct TM2Context {

  63.     AVCodecContext *avctx;

  64.     AVFrame *pic;

  65. 

  66.     BitstreamContext bc;

  67.     BswapDSPContext bdsp;

  68. 

  69.     /* TM2 streams */

  70.     int *tokens[TM2_NUM_STREAMS];

  71.     int tok_lens[TM2_NUM_STREAMS];

  72.     int tok_ptrs[TM2_NUM_STREAMS];

  73.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  74.     /* for blocks decoding */

  75.     int D[4];

  76.     int CD[4];

  77.     int *last;

  78.     int *clast;

  79. 

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

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

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

  83.     int y_stride, uv_stride;

  84.     int cur;

  85. } TM2Context;

  86. 

  87. /**

  88. * Huffman codes for each of streams

  89. */

  90. typedef struct TM2Codes {

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

  92.     int bits;

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

  94.     int length;

  95. } TM2Codes;

  96. 

  97. /**

  98. * structure for gathering Huffman codes information

  99. */

  100. typedef struct TM2Huff {

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

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

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

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

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

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

  107.     int *nums; ///< literals

  108.     uint32_t *bits; ///< codes

  109.     int *lens; ///< codelengths

  110. } TM2Huff;

  111. 

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

  113. {

  114.     int ret;

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

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

  117.                huff->max_bits);

  118.         return AVERROR_INVALIDDATA;

  119.     }

  120. 

  121.     if (!bitstream_read_bit(&ctx->bc)) { /* literal */

  122.         if (length == 0) {

  123.             length = 1;

  124.         }

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

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

  127.             return AVERROR_INVALIDDATA;

  128.         }

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

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

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

  132.         huff->num++;

  133.         return 0;

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

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

  136.             return ret;

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

  138.             return ret;

  139.     }

  140.     return 0;

  141. }

  142. 

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

  144. {

  145.     TM2Huff huff;

  146.     int res = 0;

  147. 

  148.     huff.val_bits = bitstream_read(&ctx->bc, 5);

  149.     huff.max_bits = bitstream_read(&ctx->bc, 5);

  150.     huff.min_bits = bitstream_read(&ctx->bc, 5);

  151.     huff.nodes    = bitstream_read(&ctx->bc, 17);

  152.     huff.num      = 0;

  153. 

  154.     /* check for correct codes parameters */

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

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

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

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

  159.         return AVERROR_INVALIDDATA;

  160.     }

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

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

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

  164.         return AVERROR_INVALIDDATA;

  165.     }

  166.     /* one-node tree */

  167.     if (huff.max_bits == 0)

  168.         huff.max_bits = 1;

  169. 

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

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

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

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

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

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

  176.         res = AVERROR(ENOMEM);

  177.         goto out;

  178.     }

  179. 

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

  181. 

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

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

  184.                huff.num, huff.max_num);

  185.         res = AVERROR_INVALIDDATA;

  186.     }

  187. 

  188.     /* convert codes to vlc_table */

  189.     if (res >= 0) {

  190.         int i;

  191. 

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

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

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

  195.         if (res < 0)

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

  197.         else {

  198.             code->bits = huff.max_bits;

  199.             code->length = huff.max_num;

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

  201.             if (!code->recode) {

  202.                 res = AVERROR(ENOMEM);

  203.                 goto out;

  204.             }

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

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

  207.         }

  208.     }

  209. 

  210. out:

  211.     /* free allocated memory */

  212.     av_free(huff.nums);

  213.     av_free(huff.bits);

  214.     av_free(huff.lens);

  215. 

  216.     return res;

  217. }

  218. 

  219. static void tm2_free_codes(TM2Codes *code)

  220. {

  221.     av_free(code->recode);

  222.     if (code->vlc.table)

  223.         ff_free_vlc(&code->vlc);

  224. }

  225. 

  226. static inline int tm2_get_token(BitstreamContext *bc, TM2Codes *code)

  227. {

  228.     int val;

  229.     val = bitstream_read_vlc(bc, code->vlc.table, code->bits, 1);

  230.     return code->recode[val];

  231. }

  232. 

  233. #define TM2_OLD_HEADER_MAGIC 0x00000100

  234. #define TM2_NEW_HEADER_MAGIC 0x00000101

  235. 

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

  237. {

  238.     uint32_t magic = AV_RL32(buf);

  239. 

  240.     switch (magic) {

  241.     case TM2_OLD_HEADER_MAGIC:

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

  243.         return 0;

  244.     case TM2_NEW_HEADER_MAGIC:

  245.         return 0;

  246.     default:

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

  248.                magic);

  249.         return AVERROR_INVALIDDATA;

  250.     }

  251. }

  252. 

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

  254. {

  255.     int d, mb;

  256.     int i, v;

  257. 

  258.     d  = bitstream_read(&ctx->bc, 9);

  259.     mb = bitstream_read(&ctx->bc, 5);

  260. 

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

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

  263.         return AVERROR_INVALIDDATA;

  264.     }

  265. 

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

  267.         v = bitstream_read(&ctx->bc, mb);

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

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

  270.         else

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

  272.     }

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

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

  275. 

  276.     return 0;

  277. }

  278. 

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

  280. {

  281.     int i, ret;

  282.     int skip = 0;

  283.     int len, toks, pos;

  284.     TM2Codes codes;

  285.     GetByteContext gb;

  286. 

  287.     /* get stream length in dwords */

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

  289.     len  = bytestream2_get_be32(&gb);

  290.     skip = len * 4 + 4;

  291. 

  292.     if (len == 0)

  293.         return 4;

  294. 

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

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

  297.         return AVERROR_INVALIDDATA;

  298.     }

  299. 

  300.     toks = bytestream2_get_be32(&gb);

  301.     if (toks & 1) {

  302.         len = bytestream2_get_be32(&gb);

  303.         if (len == TM2_ESCAPE) {

  304.             len = bytestream2_get_be32(&gb);

  305.         }

  306.         if (len > 0) {

  307.             pos = bytestream2_tell(&gb);

  308.             if (skip <= pos)

  309.                 return AVERROR_INVALIDDATA;

  310.             bitstream_init8(&ctx->bc, buf + pos, skip - pos);

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

  312.                 return ret;

  313.             bytestream2_skip(&gb, ((bitstream_tell(&ctx->bc) + 31) >> 5) << 2);

  314.         }

  315.     }

  316.     /* skip unused fields */

  317.     len = bytestream2_get_be32(&gb);

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

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

  320.     } else {

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

  322.     }

  323. 

  324.     pos = bytestream2_tell(&gb);

  325.     if (skip <= pos)

  326.         return AVERROR_INVALIDDATA;

  327.     bitstream_init8(&ctx->bc, buf + pos, skip - pos);

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

  329.         return ret;

  330.     bytestream2_skip(&gb, ((bitstream_tell(&ctx->bc) + 31) >> 5) << 2);

  331. 

  332.     toks >>= 1;

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

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

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

  336.         tm2_free_codes(&codes);

  337.         return AVERROR_INVALIDDATA;

  338.     }

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

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

  341.     len = bytestream2_get_be32(&gb);

  342.     if (len > 0) {

  343.         pos = bytestream2_tell(&gb);

  344.         if (skip <= pos)

  345.             return AVERROR_INVALIDDATA;

  346.         bitstream_init8(&ctx->bc, buf + pos, skip - pos);

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

  348.             if (bitstream_bits_left(&ctx->bc) <= 0) {

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

  350.                 return AVERROR_INVALIDDATA;

  351.             }

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

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

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

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

  356.                 return AVERROR_INVALIDDATA;

  357.             }

  358.         }

  359.     } else {

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

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

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

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

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

  365.                 return AVERROR_INVALIDDATA;

  366.             }

  367.         }

  368.     }

  369.     tm2_free_codes(&codes);

  370. 

  371.     return skip;

  372. }

  373. 

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

  375. {

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

  377.         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]);

  378.         return 0;

  379.     }

  380.     if (type <= TM2_MOT)

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

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

  383. }

  384. 

  385. /* blocks decoding routines */

  386. 

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

  388. #define TM2_INIT_POINTERS() \

  389.     int *last, *clast; \

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

  391.     int Ystride, Ustride, Vstride;\

  392. \

  393.     Ystride = ctx->y_stride;\

  394.     Vstride = ctx->uv_stride;\

  395.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  401. 

  402. #define TM2_INIT_POINTERS_2() \

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

  404.     int oYstride, oUstride, oVstride;\

  405. \

  406.     TM2_INIT_POINTERS();\

  407.     oYstride = Ystride;\

  408.     oVstride = Vstride;\

  409.     oUstride = Ustride;\

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

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

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

  413. 

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

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

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

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

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

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

  420. 

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

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

  423. {

  424.     int ct, d;

  425.     int i, j;

  426. 

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

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

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

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

  431.             ct      += d;

  432.             last[i] += ct;

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

  434.         }

  435.         Y        += stride;

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

  437.     }

  438. }

  439. 

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

  441. {

  442.     int i, j;

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

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

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

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

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

  448.         }

  449.         data += stride;

  450.     }

  451. }

  452. 

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

  454. {

  455.     int t;

  456.     int l;

  457.     int prev;

  458. 

  459.     if (bx > 0)

  460.         prev = clast[-3];

  461.     else

  462.         prev = 0;

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

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

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

  466.     CD[0]    = t;

  467.     clast[0] = l;

  468. 

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

  470. }

  471. 

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

  473. {

  474.     int i;

  475.     int deltas[16];

  476.     TM2_INIT_POINTERS();

  477. 

  478.     /* hi-res chroma */

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

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

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

  482.     }

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

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

  485. 

  486.     /* hi-res luma */

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

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

  489. 

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

  491. }

  492. 

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

  494. {

  495.     int i;

  496.     int deltas[16];

  497.     TM2_INIT_POINTERS();

  498. 

  499.     /* low-res chroma */

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

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

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

  503. 

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

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

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

  507. 

  508.     /* hi-res luma */

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

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

  511. 

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

  513. }

  514. 

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

  516. {

  517.     int i;

  518.     int t1, t2;

  519.     int deltas[16];

  520.     TM2_INIT_POINTERS();

  521. 

  522.     /* low-res chroma */

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

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

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

  526. 

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

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

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

  530. 

  531.     /* low-res luma */

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

  533.         deltas[i] = 0;

  534. 

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

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

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

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

  539. 

  540.     if (bx > 0)

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

  542.     else

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

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

  545. 

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

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

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

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

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

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

  552. 

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

  554. }

  555. 

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

  557. {

  558.     int i;

  559.     int ct;

  560.     int left, right, diff;

  561.     int deltas[16];

  562.     TM2_INIT_POINTERS();

  563. 

  564.     /* null chroma */

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

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

  567. 

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

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

  570. 

  571.     /* null luma */

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

  573.         deltas[i] = 0;

  574. 

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

  576. 

  577.     if (bx > 0)

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

  579.     else

  580.         left = 0;

  581. 

  582.     right   = last[3];

  583.     diff    = right - left;

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

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

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

  587.     last[3] = right;

  588.     {

  589.         int tp = left;

  590. 

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

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

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

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

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

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

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

  598.     }

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

  600. }

  601. 

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

  603. {

  604.     int i, j;

  605.     TM2_INIT_POINTERS_2();

  606. 

  607.     /* update chroma */

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

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

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

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

  612.         }

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

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

  615.     }

  616.     U -= Ustride * 2;

  617.     V -= Vstride * 2;

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

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

  620. 

  621.     /* update deltas */

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

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

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

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

  626. 

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

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

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

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

  631.         }

  632.         Y  += Ystride;

  633.         Yo += oYstride;

  634.     }

  635. }

  636. 

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

  638. {

  639.     int i, j;

  640.     int d;

  641.     TM2_INIT_POINTERS_2();

  642. 

  643.     /* update chroma */

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

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

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

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

  648.         }

  649.         U  += Ustride;

  650.         V  += Vstride;

  651.         Uo += oUstride;

  652.         Vo += oVstride;

  653.     }

  654.     U -= Ustride * 2;

  655.     V -= Vstride * 2;

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

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

  658. 

  659.     /* update deltas */

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

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

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

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

  664. 

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

  666.         d = last[3];

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

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

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

  670.         }

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

  672.         Y  += Ystride;

  673.         Yo += oYstride;

  674.     }

  675. }

  676. 

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

  678. {

  679.     int i, j;

  680.     int mx, my;

  681.     TM2_INIT_POINTERS_2();

  682. 

  683.     mx = GET_TOK(ctx, TM2_MOT);

  684.     my = GET_TOK(ctx, TM2_MOT);

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

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

  687. 

  688.     Yo += my * oYstride + mx;

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

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

  691. 

  692.     /* copy chroma */

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

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

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

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

  697.         }

  698.         U  += Ustride;

  699.         V  += Vstride;

  700.         Uo += oUstride;

  701.         Vo += oVstride;

  702.     }

  703.     U -= Ustride * 2;

  704.     V -= Vstride * 2;

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

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

  707. 

  708.     /* copy luma */

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

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

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

  712.         }

  713.         Y  += Ystride;

  714.         Yo += oYstride;

  715.     }

  716.     /* calculate deltas */

  717.     Y -= Ystride * 4;

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

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

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

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

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

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

  724. }

  725. 

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

  727. {

  728.     int i, j;

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

  730.     int type;

  731.     int keyframe = 1;

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

  733.     uint8_t *dst;

  734. 

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

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

  737. 

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

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

  740.         return AVERROR_INVALIDDATA;

  741.     }

  742. 

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

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

  745. 

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

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

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

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

  750.             type = GET_TOK(ctx, TM2_TYPE);

  751.             switch(type) {

  752.             case TM2_HI_RES:

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

  754.                 break;

  755.             case TM2_MED_RES:

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

  757.                 break;

  758.             case TM2_LOW_RES:

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

  760.                 break;

  761.             case TM2_NULL_RES:

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

  763.                 break;

  764.             case TM2_UPDATE:

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

  766.                 keyframe = 0;

  767.                 break;

  768.             case TM2_STILL:

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

  770.                 keyframe = 0;

  771.                 break;

  772.             case TM2_MOTION:

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

  774.                 keyframe = 0;

  775.                 break;

  776.             default:

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

  778.             }

  779.         }

  780.     }

  781. 

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

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

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

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

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

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

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

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

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

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

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

  793.         }

  794. 

  795.         /* horizontal edge extension */

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

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

  798. 

  799.         /* vertical edge extension */

  800.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  810.         }

  811. 

  812.         Y += ctx->y_stride;

  813.         if (j & 1) {

  814.             /* horizontal edge extension */

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

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

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

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

  819. 

  820.             /* vertical edge extension */

  821.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  831.             }

  832. 

  833.             U += ctx->uv_stride;

  834.             V += ctx->uv_stride;

  835.         }

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

  837.     }

  838. 

  839.     return keyframe;

  840. }

  841. 

  842. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  844. };

  845. 

  846. #define TM2_HEADER_SIZE 40

  847. 

  848. static int decode_frame(AVCodecContext *avctx,

  849.                         void *data, int *got_frame,

  850.                         AVPacket *avpkt)

  851. {

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

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

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

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

  856.     int offset           = TM2_HEADER_SIZE;

  857.     int i, t, ret;

  858.     uint8_t *swbuf;

  859. 

  860.     swbuf = av_malloc(buf_size + AV_INPUT_BUFFER_PADDING_SIZE);

  861.     if (!swbuf) {

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

  863.         return AVERROR(ENOMEM);

  864.     }

  865. 

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

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

  868.         av_free(swbuf);

  869.         return ret;

  870.     }

  871. 

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

  873.                       buf_size >> 2);

  874. 

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

  876.         av_free(swbuf);

  877.         return ret;

  878.     }

  879. 

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

  881.         if (offset >= buf_size) {

  882.             av_free(swbuf);

  883.             return AVERROR_INVALIDDATA;

  884.         }

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

  886.                             buf_size - offset);

  887.         if (t < 0) {

  888.             av_free(swbuf);

  889.             return t;

  890.         }

  891.         offset += t;

  892.     }

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

  894.     if (p->key_frame)

  895.         p->pict_type = AV_PICTURE_TYPE_I;

  896.     else

  897.         p->pict_type = AV_PICTURE_TYPE_P;

  898. 

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

  900.     *got_frame      = 1;

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

  902.     av_free(swbuf);

  903. 

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

  905. }

  906. 

  907. static av_cold int decode_init(AVCodecContext *avctx)

  908. {

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

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

  911. 

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

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

  914.         return AVERROR(EINVAL);

  915.     }

  916. 

  917.     l->avctx       = avctx;

  918.     avctx->pix_fmt = AV_PIX_FMT_BGR24;

  919. 

  920.     l->pic = av_frame_alloc();

  921.     if (!l->pic)

  922.         return AVERROR(ENOMEM);

  923. 

  924.     ff_bswapdsp_init(&l->bdsp);

  925. 

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

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

  928. 

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

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

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

  932.     }

  933. 

  934.     w += 8;

  935.     h += 8;

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

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

  938.     l->y_stride = w;

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

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

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

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

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

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

  945.     l->uv_stride = w;

  946.     l->cur = 0;

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

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

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

  950.         av_freep(&l->Y1_base);

  951.         av_freep(&l->Y2_base);

  952.         av_freep(&l->U1_base);

  953.         av_freep(&l->U2_base);

  954.         av_freep(&l->V1_base);

  955.         av_freep(&l->V2_base);

  956.         av_freep(&l->last);

  957.         av_freep(&l->clast);

  958.         return AVERROR(ENOMEM);

  959.     }

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

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

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

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

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

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

  966. 

  967.     return 0;

  968. }

  969. 

  970. static av_cold int decode_end(AVCodecContext *avctx)

  971. {

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

  973.     int i;

  974. 

  975.     av_free(l->last);

  976.     av_free(l->clast);

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

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

  979.     if (l->Y1) {

  980.         av_free(l->Y1_base);

  981.         av_free(l->U1_base);

  982.         av_free(l->V1_base);

  983.         av_free(l->Y2_base);

  984.         av_free(l->U2_base);

  985.         av_free(l->V2_base);

  986.     }

  987. 

  988.     av_frame_free(&l->pic);

  989. 

  990.     return 0;

  991. }

  992. 

  993. AVCodec ff_truemotion2_decoder = {

  994.     .name           = "truemotion2",

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

  996.     .type           = AVMEDIA_TYPE_VIDEO,

  997.     .id             = AV_CODEC_ID_TRUEMOTION2,

  998.     .priv_data_size = sizeof(TM2Context),

  999.     .init           = decode_init,

  1000.     .close          = decode_end,

  1001.     .decode         = decode_frame,

  1002.     .capabilities   = AV_CODEC_CAP_DR1,

  1003. };