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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 "avcodec.h"

  28. #include "bytestream.h"

  29. #include "get_bits.h"

  30. #include "dsputil.h"

  31. 

  32. #define TM2_ESCAPE 0x80000000

  33. #define TM2_DELTAS 64

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

  35. enum TM2_STREAMS{ TM2_C_HI = 0, TM2_C_LO, TM2_L_HI, TM2_L_LO,

  36.      TM2_UPD, TM2_MOT, TM2_TYPE, TM2_NUM_STREAMS};

  37. /* Block types */

  38. enum TM2_BLOCKS{ TM2_HI_RES = 0, TM2_MED_RES, TM2_LOW_RES, TM2_NULL_RES,

  39.                  TM2_UPDATE, TM2_STILL, TM2_MOTION};

  40. 

  41. typedef struct TM2Context{

  42.     AVCodecContext *avctx;

  43.     AVFrame pic;

  44. 

  45.     GetBitContext gb;

  46.     DSPContext dsp;

  47. 

  48.     /* TM2 streams */

  49.     int *tokens[TM2_NUM_STREAMS];

  50.     int tok_lens[TM2_NUM_STREAMS];

  51.     int tok_ptrs[TM2_NUM_STREAMS];

  52.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  53.     /* for blocks decoding */

  54.     int D[4];

  55.     int CD[4];

  56.     int *last;

  57.     int *clast;

  58. 

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

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

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

  62.     int y_stride, uv_stride;

  63.     int cur;

  64. } TM2Context;

  65. 

  66. /**

  67. * Huffman codes for each of streams

  68. */

  69. typedef struct TM2Codes{

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

  71.     int bits;

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

  73.     int length;

  74. } TM2Codes;

  75. 

  76. /**

  77. * structure for gathering Huffman codes information

  78. */

  79. typedef struct TM2Huff{

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

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

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

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

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

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

  86.     int *nums; ///< literals

  87.     uint32_t *bits; ///< codes

  88.     int *lens; ///< codelengths

  89. } TM2Huff;

  90. 

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

  92. {

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

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

  95.         return -1;

  96.     }

  97. 

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

  99.         if (length == 0) {

  100.             length = 1;

  101.         }

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

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

  104.             return -1;

  105.         }

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

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

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

  109.         huff->num++;

  110.         return 0;

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

  112.         if(tm2_read_tree(ctx, prefix << 1, length + 1, huff) == -1)

  113.             return -1;

  114.         if(tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff) == -1)

  115.             return -1;

  116.     }

  117.     return 0;

  118. }

  119. 

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

  121. {

  122.     TM2Huff huff;

  123.     int res = 0;

  124. 

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

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

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

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

  129.     huff.num = 0;

  130. 

  131.     /* check for correct codes parameters */

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

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

  134.         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal length: %i, max code length: %i\n",

  135.                huff.val_bits, huff.max_bits);

  136.         return -1;

  137.     }

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

  139.         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree nodes: %i\n", huff.nodes);

  140.         return -1;

  141.     }

  142.     /* one-node tree */

  143.     if(huff.max_bits == 0)

  144.         huff.max_bits = 1;

  145. 

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

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

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

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

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

  151. 

  152.     if(tm2_read_tree(ctx, 0, 0, &huff) == -1)

  153.         res = -1;

  154. 

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

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

  157.                huff.num, huff.max_num);

  158.         res = -1;

  159.     }

  160. 

  161.     /* convert codes to vlc_table */

  162.     if(res != -1) {

  163.         int i;

  164. 

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

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

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

  168.         if(res < 0) {

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

  170.             res = -1;

  171.         } else

  172.             res = 0;

  173.         if(res != -1) {

  174.             code->bits = huff.max_bits;

  175.             code->length = huff.max_num;

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

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

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

  179.         }

  180.     }

  181.     /* free allocated memory */

  182.     av_free(huff.nums);

  183.     av_free(huff.bits);

  184.     av_free(huff.lens);

  185. 

  186.     return res;

  187. }

  188. 

  189. static void tm2_free_codes(TM2Codes *code)

  190. {

  191.     av_free(code->recode);

  192.     if(code->vlc.table)

  193.         ff_free_vlc(&code->vlc);

  194. }

  195. 

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

  197. {

  198.     int val;

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

  200.     return code->recode[val];

  201. }

  202. 

  203. #define TM2_OLD_HEADER_MAGIC 0x00000100

  204. #define TM2_NEW_HEADER_MAGIC 0x00000101

  205. 

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

  207. {

  208.     uint32_t magic = AV_RL32(buf);

  209. 

  210.     switch (magic) {

  211.     case TM2_OLD_HEADER_MAGIC:

  212.         av_log_missing_feature(ctx->avctx, "TM2 old header", 1);

  213.         return 0;

  214.     case TM2_NEW_HEADER_MAGIC:

  215.         return 0;

  216.     default:

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

  218.         return AVERROR_INVALIDDATA;

  219.     }

  220. }

  221. 

  222. static int tm2_read_deltas(TM2Context *ctx, int stream_id) {

  223.     int d, mb;

  224.     int i, v;

  225. 

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

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

  228. 

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

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

  231.         return -1;

  232.     }

  233. 

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

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

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

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

  238.         else

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

  240.     }

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

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

  243. 

  244.     return 0;

  245. }

  246. 

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

  248. {

  249.     int i;

  250.     int skip = 0;

  251.     int len, toks, pos;

  252.     TM2Codes codes;

  253.     GetByteContext gb;

  254. 

  255.     /* get stream length in dwords */

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

  257.     len  = bytestream2_get_be32(&gb);

  258.     skip = len * 4 + 4;

  259. 

  260.     if(len == 0)

  261.         return 4;

  262. 

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

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

  265.         return -1;

  266.     }

  267. 

  268.     toks = bytestream2_get_be32(&gb);

  269.     if(toks & 1) {

  270.         len = bytestream2_get_be32(&gb);

  271.         if(len == TM2_ESCAPE) {

  272.             len = bytestream2_get_be32(&gb);

  273.         }

  274.         if(len > 0) {

  275.             pos = bytestream2_tell(&gb);

  276.             if (skip <= pos)

  277.                 return -1;

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

  279.             if(tm2_read_deltas(ctx, stream_id) == -1)

  280.                 return -1;

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

  282.         }

  283.     }

  284.     /* skip unused fields */

  285.     len = bytestream2_get_be32(&gb);

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

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

  288.     } else {

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

  290.     }

  291. 

  292.     pos = bytestream2_tell(&gb);

  293.     if (skip <= pos)

  294.         return -1;

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

  296.     if(tm2_build_huff_table(ctx, &codes) == -1)

  297.         return -1;

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

  299. 

  300.     toks >>= 1;

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

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

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

  304.         tm2_free_codes(&codes);

  305.         return -1;

  306.     }

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

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

  309.     len = bytestream2_get_be32(&gb);

  310.     if(len > 0) {

  311.         pos = bytestream2_tell(&gb);

  312.         if (skip <= pos)

  313.             return -1;

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

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

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

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

  318.                 return -1;

  319.             }

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

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

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

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

  324.                 return AVERROR_INVALIDDATA;

  325.             }

  326.         }

  327.     } else {

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

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

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

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

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

  333.                 return AVERROR_INVALIDDATA;

  334.             }

  335.         }

  336.     }

  337.     tm2_free_codes(&codes);

  338. 

  339.     return skip;

  340. }

  341. 

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

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

  344.         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]);

  345.         return 0;

  346.     }

  347.     if(type <= TM2_MOT)

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

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

  350. }

  351. 

  352. /* blocks decoding routines */

  353. 

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

  355. #define TM2_INIT_POINTERS() \

  356.     int *last, *clast; \

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

  358.     int Ystride, Ustride, Vstride;\

  359. \

  360.     Ystride = ctx->y_stride;\

  361.     Vstride = ctx->uv_stride;\

  362.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  368. 

  369. #define TM2_INIT_POINTERS_2() \

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

  371.     int oYstride, oUstride, oVstride;\

  372. \

  373.     TM2_INIT_POINTERS();\

  374.     oYstride = Ystride;\

  375.     oVstride = Vstride;\

  376.     oUstride = Ustride;\

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

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

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

  380. 

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

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

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

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

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

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

  387. 

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

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

  390. {

  391.     int ct, d;

  392.     int i, j;

  393. 

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

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

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

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

  398.             ct += d;

  399.             last[i] += ct;

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

  401.         }

  402.         Y += stride;

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

  404.     }

  405. }

  406. 

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

  408. {

  409.     int i, j;

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

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

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

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

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

  415.         }

  416.         data += stride;

  417.     }

  418. }

  419. 

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

  421. {

  422.     int t;

  423.     int l;

  424.     int prev;

  425. 

  426.     if(bx > 0)

  427.         prev = clast[-3];

  428.     else

  429.         prev = 0;

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

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

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

  433.     CD[0] = t;

  434.     clast[0] = l;

  435. 

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

  437. }

  438. 

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

  440. {

  441.     int i;

  442.     int deltas[16];

  443.     TM2_INIT_POINTERS();

  444. 

  445.     /* hi-res chroma */

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

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

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

  449.     }

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

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

  452. 

  453.     /* hi-res luma */

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

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

  456. 

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

  458. }

  459. 

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

  461. {

  462.     int i;

  463.     int deltas[16];

  464.     TM2_INIT_POINTERS();

  465. 

  466.     /* low-res chroma */

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

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

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

  470. 

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

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

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

  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_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

  483. {

  484.     int i;

  485.     int t1, t2;

  486.     int deltas[16];

  487.     TM2_INIT_POINTERS();

  488. 

  489.     /* low-res chroma */

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

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

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

  493. 

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

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

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

  497. 

  498.     /* low-res luma */

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

  500.         deltas[i] = 0;

  501. 

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

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

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

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

  506. 

  507.     if(bx > 0)

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

  509.     else

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

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

  512. 

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

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

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

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

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

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

  519. 

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

  521. }

  522. 

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

  524. {

  525.     int i;

  526.     int ct;

  527.     int left, right, diff;

  528.     int deltas[16];

  529.     TM2_INIT_POINTERS();

  530. 

  531.     /* null chroma */

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

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

  534. 

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

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

  537. 

  538.     /* null luma */

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

  540.         deltas[i] = 0;

  541. 

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

  543. 

  544.     if(bx > 0)

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

  546.     else

  547.         left = 0;

  548. 

  549.     right = last[3];

  550.     diff = right - left;

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

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

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

  554.     last[3] = right;

  555.     {

  556.         int tp = left;

  557. 

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

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

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

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

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

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

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

  565.     }

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

  567. }

  568. 

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

  570. {

  571.     int i, j;

  572.     TM2_INIT_POINTERS_2();

  573. 

  574.     /* update chroma */

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

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

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

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

  579.         }

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

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

  582.     }

  583.     U -= Ustride * 2;

  584.     V -= Vstride * 2;

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

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

  587. 

  588.     /* update deltas */

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

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

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

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

  593. 

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

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

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

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

  598.         }

  599.         Y += Ystride;

  600.         Yo += oYstride;

  601.     }

  602. }

  603. 

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

  605. {

  606.     int i, j;

  607.     int d;

  608.     TM2_INIT_POINTERS_2();

  609. 

  610.     /* update chroma */

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

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

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

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

  615.         }

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

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

  618.     }

  619.     U -= Ustride * 2;

  620.     V -= Vstride * 2;

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

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

  623. 

  624.     /* update deltas */

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

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

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

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

  629. 

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

  631.         d = last[3];

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

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

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

  635.         }

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

  637.         Y += Ystride;

  638.         Yo += oYstride;

  639.     }

  640. }

  641. 

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

  643. {

  644.     int i, j;

  645.     int mx, my;

  646.     TM2_INIT_POINTERS_2();

  647. 

  648.     mx = GET_TOK(ctx, TM2_MOT);

  649.     my = GET_TOK(ctx, TM2_MOT);

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

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

  652. 

  653.     Yo += my * oYstride + mx;

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

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

  656. 

  657.     /* copy chroma */

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

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

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

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

  662.         }

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

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

  665.     }

  666.     U -= Ustride * 2;

  667.     V -= Vstride * 2;

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

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

  670. 

  671.     /* copy luma */

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

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

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

  675.         }

  676.         Y += Ystride;

  677.         Yo += oYstride;

  678.     }

  679.     /* calculate deltas */

  680.     Y -= Ystride * 4;

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

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

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

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

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

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

  687. }

  688. 

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

  690. {

  691.     int i, j;

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

  693.     int type;

  694.     int keyframe = 1;

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

  696.     uint8_t *dst;

  697. 

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

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

  700. 

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

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

  703.         return -1;

  704.     }

  705. 

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

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

  708. 

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

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

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

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

  713.             type = GET_TOK(ctx, TM2_TYPE);

  714.             switch(type) {

  715.             case TM2_HI_RES:

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

  717.                 break;

  718.             case TM2_MED_RES:

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

  720.                 break;

  721.             case TM2_LOW_RES:

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

  723.                 break;

  724.             case TM2_NULL_RES:

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

  726.                 break;

  727.             case TM2_UPDATE:

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

  729.                 keyframe = 0;

  730.                 break;

  731.             case TM2_STILL:

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

  733.                 keyframe = 0;

  734.                 break;

  735.             case TM2_MOTION:

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

  737.                 keyframe = 0;

  738.                 break;

  739.             default:

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

  741.             }

  742.         }

  743.     }

  744. 

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

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

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

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

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

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

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

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

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

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

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

  756.         }

  757. 

  758.         /* horizontal edge extension */

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

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

  761. 

  762.         /* vertical edge extension */

  763.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  773.         }

  774. 

  775.         Y += ctx->y_stride;

  776.         if (j & 1) {

  777.             /* horizontal edge extension */

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

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

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

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

  782. 

  783.             /* vertical edge extension */

  784.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  794.             }

  795. 

  796.             U += ctx->uv_stride;

  797.             V += ctx->uv_stride;

  798.         }

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

  800.     }

  801. 

  802.     return keyframe;

  803. }

  804. 

  805. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  807. };

  808. 

  809. #define TM2_HEADER_SIZE 40

  810. 

  811. static int decode_frame(AVCodecContext *avctx,

  812.                         void *data, int *got_frame,

  813.                         AVPacket *avpkt)

  814. {

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

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

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

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

  819.     int i, offset = TM2_HEADER_SIZE, t, ret;

  820.     uint8_t *swbuf;

  821. 

  822.     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  823.     if(!swbuf){

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

  825.         return -1;

  826.     }

  827.     p->reference = 1;

  828.     p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;

  829.     if(avctx->reget_buffer(avctx, p) < 0){

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

  831.         av_free(swbuf);

  832.         return -1;

  833.     }

  834. 

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

  836. 

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

  838.         av_free(swbuf);

  839.         return ret;

  840.     }

  841. 

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

  843.         if (offset >= buf_size) {

  844.             av_free(swbuf);

  845.             return AVERROR_INVALIDDATA;

  846.         }

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

  848.                             buf_size - offset);

  849.         if(t < 0){

  850.             av_free(swbuf);

  851.             return t;

  852.         }

  853.         offset += t;

  854.     }

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

  856.     if(p->key_frame)

  857.         p->pict_type = AV_PICTURE_TYPE_I;

  858.     else

  859.         p->pict_type = AV_PICTURE_TYPE_P;

  860. 

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

  862.     *got_frame      = 1;

  863.     *(AVFrame*)data = l->pic;

  864.     av_free(swbuf);

  865. 

  866.     return buf_size;

  867. }

  868. 

  869. static av_cold int decode_init(AVCodecContext *avctx){

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

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

  872. 

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

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

  875.         return -1;

  876.     }

  877. 

  878.     l->avctx = avctx;

  879.     l->pic.data[0]=NULL;

  880.     avctx->pix_fmt = AV_PIX_FMT_BGR24;

  881. 

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

  883. 

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

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

  886. 

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

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

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

  890.     }

  891. 

  892.     w += 8;

  893.     h += 8;

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

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

  896.     l->y_stride = w;

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

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

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

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

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

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

  903.     l->uv_stride = w;

  904.     l->cur = 0;

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

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

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

  908.         av_freep(l->Y1_base);

  909.         av_freep(l->Y2_base);

  910.         av_freep(l->U1_base);

  911.         av_freep(l->U2_base);

  912.         av_freep(l->V1_base);

  913.         av_freep(l->V2_base);

  914.         av_freep(l->last);

  915.         av_freep(l->clast);

  916.         return AVERROR(ENOMEM);

  917.     }

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

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

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

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

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

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

  924. 

  925.     return 0;

  926. }

  927. 

  928. static av_cold int decode_end(AVCodecContext *avctx){

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

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

  931.     int i;

  932. 

  933.     av_free(l->last);

  934.     av_free(l->clast);

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

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

  937.     if(l->Y1){

  938.         av_free(l->Y1_base);

  939.         av_free(l->U1_base);

  940.         av_free(l->V1_base);

  941.         av_free(l->Y2_base);

  942.         av_free(l->U2_base);

  943.         av_free(l->V2_base);

  944.     }

  945. 

  946.     if (pic->data[0])

  947.         avctx->release_buffer(avctx, pic);

  948. 

  949.     return 0;

  950. }

  951. 

  952. AVCodec ff_truemotion2_decoder = {

  953.     .name           = "truemotion2",

  954.     .type           = AVMEDIA_TYPE_VIDEO,

  955.     .id             = AV_CODEC_ID_TRUEMOTION2,

  956.     .priv_data_size = sizeof(TM2Context),

  957.     .init           = decode_init,

  958.     .close          = decode_end,

  959.     .decode         = decode_frame,

  960.     .capabilities   = CODEC_CAP_DR1,

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

  962. };