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FFmpeg/libavcodec/truemotion2.c

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  1. /*

  2.  * Duck/ON2 TrueMotion 2 Decoder

  3.  * Copyright (c) 2005 Konstantin Shishkov

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * Duck TrueMotion2 decoder.

  25.  */

  26. 

  27. #include "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.     uint8_t *buffer;

  49.     int buffer_size;

  50. 

  51.     /* TM2 streams */

  52.     int *tokens[TM2_NUM_STREAMS];

  53.     int tok_lens[TM2_NUM_STREAMS];

  54.     int tok_ptrs[TM2_NUM_STREAMS];

  55.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  56.     /* for blocks decoding */

  57.     int D[4];

  58.     int CD[4];

  59.     int *last;

  60.     int *clast;

  61. 

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

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

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

  65.     int y_stride, uv_stride;

  66.     int cur;

  67. } TM2Context;

  68. 

  69. /**

  70. * Huffman codes for each of streams

  71. */

  72. typedef struct TM2Codes{

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

  74.     int bits;

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

  76.     int length;

  77. } TM2Codes;

  78. 

  79. /**

  80. * structure for gathering Huffman codes information

  81. */

  82. typedef struct TM2Huff{

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

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

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

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

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

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

  89.     int *nums; ///< literals

  90.     uint32_t *bits; ///< codes

  91.     int *lens; ///< codelengths

  92. } TM2Huff;

  93. 

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

  95. {

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

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

  98.         return -1;

  99.     }

  100. 

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

  102.         if (length == 0) {

  103.             length = 1;

  104.         }

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

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

  107.             return -1;

  108.         }

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

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

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

  112.         huff->num++;

  113.         return 0;

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

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

  116.             return -1;

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

  118.             return -1;

  119.     }

  120.     return 0;

  121. }

  122. 

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

  124. {

  125.     TM2Huff huff;

  126.     int res = 0;

  127. 

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

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

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

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

  132.     huff.num = 0;

  133. 

  134.     /* check for correct codes parameters */

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

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

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

  138.                huff.val_bits, huff.max_bits);

  139.         return -1;

  140.     }

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

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

  143.         return -1;

  144.     }

  145.     /* one-node tree */

  146.     if(huff.max_bits == 0)

  147.         huff.max_bits = 1;

  148. 

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

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

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

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

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

  154. 

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

  156.         res = -1;

  157. 

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

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

  160.                huff.num, huff.max_num);

  161.         res = -1;

  162.     }

  163. 

  164.     /* convert codes to vlc_table */

  165.     if(res != -1) {

  166.         int i;

  167. 

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

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

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

  171.         if(res < 0) {

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

  173.             res = -1;

  174.         } else

  175.             res = 0;

  176.         if(res != -1) {

  177.             code->bits = huff.max_bits;

  178.             code->length = huff.max_num;

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

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

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

  182.         }

  183.     }

  184.     /* free allocated memory */

  185.     av_free(huff.nums);

  186.     av_free(huff.bits);

  187.     av_free(huff.lens);

  188. 

  189.     return res;

  190. }

  191. 

  192. static void tm2_free_codes(TM2Codes *code)

  193. {

  194.     av_free(code->recode);

  195.     if(code->vlc.table)

  196.         ff_free_vlc(&code->vlc);

  197. }

  198. 

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

  200. {

  201.     int val;

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

  203.     return code->recode[val];

  204. }

  205. 

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

  207. {

  208.     uint32_t magic;

  209.     const uint8_t *obuf;

  210. 

  211.     obuf = buf;

  212. 

  213.     magic = AV_RL32(buf);

  214.     buf += 4;

  215. 

  216.     if(magic == 0x00000100) { /* old header */

  217. /*      av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */

  218.         return 40;

  219.     } else if(magic == 0x00000101) { /* new header */

  220.         return 40;

  221.     } else {

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

  223.         return -1;

  224.     }

  225. 

  226.     return buf - obuf;

  227. }

  228. 

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

  230.     int d, mb;

  231.     int i, v;

  232. 

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

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

  235. 

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

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

  238.         return -1;

  239.     }

  240. 

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

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

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

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

  245.         else

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

  247.     }

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

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

  250. 

  251.     return 0;

  252. }

  253. 

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

  255. {

  256.     int i;

  257.     int skip = 0;

  258.     int len, toks, pos;

  259.     TM2Codes codes;

  260.     GetByteContext gb;

  261. 

  262.     if (buf_size < 4) {

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

  264.         return AVERROR_INVALIDDATA;

  265.     }

  266. 

  267.     /* get stream length in dwords */

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

  269.     len  = bytestream2_get_be32(&gb);

  270.     skip = len * 4 + 4;

  271. 

  272.     if(len == 0)

  273.         return 4;

  274. 

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

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

  277.         return -1;

  278.     }

  279. 

  280.     toks = bytestream2_get_be32(&gb);

  281.     if(toks & 1) {

  282.         len = bytestream2_get_be32(&gb);

  283.         if(len == TM2_ESCAPE) {

  284.             len = bytestream2_get_be32(&gb);

  285.         }

  286.         if(len > 0) {

  287.             pos = bytestream2_tell(&gb);

  288.             if (skip <= pos)

  289.                 return -1;

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

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

  292.                 return -1;

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

  294.         }

  295.     }

  296.     /* skip unused fields */

  297.     len = bytestream2_get_be32(&gb);

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

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

  300.     } else {

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

  302.     }

  303. 

  304.     pos = bytestream2_tell(&gb);

  305.     if (skip <= pos)

  306.         return -1;

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

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

  309.         return -1;

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

  311. 

  312.     toks >>= 1;

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

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

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

  316.         tm2_free_codes(&codes);

  317.         return -1;

  318.     }

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

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

  321.     len = bytestream2_get_be32(&gb);

  322.     if(len > 0) {

  323.         pos = bytestream2_tell(&gb);

  324.         if (skip <= pos)

  325.             return -1;

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

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

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

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

  330.                 return -1;

  331.             }

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

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

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

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

  336.                 return AVERROR_INVALIDDATA;

  337.             }

  338.         }

  339.     } else {

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

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

  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.     }

  349.     tm2_free_codes(&codes);

  350. 

  351.     return skip;

  352. }

  353. 

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

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

  356.         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]);

  357.         return 0;

  358.     }

  359.     if(type <= TM2_MOT) {

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

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

  362.             return 0;

  363.         }

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

  365.     }

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

  367. }

  368. 

  369. /* blocks decoding routines */

  370. 

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

  372. #define TM2_INIT_POINTERS() \

  373.     int *last, *clast; \

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

  375.     int Ystride, Ustride, Vstride;\

  376. \

  377.     Ystride = ctx->y_stride;\

  378.     Vstride = ctx->uv_stride;\

  379.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  385. 

  386. #define TM2_INIT_POINTERS_2() \

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

  388.     int oYstride, oUstride, oVstride;\

  389. \

  390.     TM2_INIT_POINTERS();\

  391.     oYstride = Ystride;\

  392.     oVstride = Vstride;\

  393.     oUstride = Ustride;\

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

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

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

  397. 

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

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

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

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

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

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

  404. 

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

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

  407. {

  408.     int ct, d;

  409.     int i, j;

  410. 

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

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

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

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

  415.             ct += d;

  416.             last[i] += ct;

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

  418.         }

  419.         Y += stride;

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

  421.     }

  422. }

  423. 

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

  425. {

  426.     int i, j;

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

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

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

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

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

  432.         }

  433.         data += stride;

  434.     }

  435. }

  436. 

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

  438. {

  439.     int t;

  440.     int l;

  441.     int prev;

  442. 

  443.     if(bx > 0)

  444.         prev = clast[-3];

  445.     else

  446.         prev = 0;

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

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

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

  450.     CD[0] = t;

  451.     clast[0] = l;

  452. 

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

  454. }

  455. 

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

  457. {

  458.     int i;

  459.     int deltas[16];

  460.     TM2_INIT_POINTERS();

  461. 

  462.     /* hi-res chroma */

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

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

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

  466.     }

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

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

  469. 

  470.     /* hi-res luma */

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

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

  473. 

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

  475. }

  476. 

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

  478. {

  479.     int i;

  480.     int deltas[16];

  481.     TM2_INIT_POINTERS();

  482. 

  483.     /* low-res chroma */

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

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

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

  487. 

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

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

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

  491. 

  492.     /* hi-res luma */

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

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

  495. 

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

  497. }

  498. 

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

  500. {

  501.     int i;

  502.     int t1, t2;

  503.     int deltas[16];

  504.     TM2_INIT_POINTERS();

  505. 

  506.     /* low-res chroma */

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

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

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

  510. 

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

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

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

  514. 

  515.     /* low-res luma */

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

  517.         deltas[i] = 0;

  518. 

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

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

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

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

  523. 

  524.     if(bx > 0)

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

  526.     else

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

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

  529. 

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

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

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

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

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

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

  536. 

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

  538. }

  539. 

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

  541. {

  542.     int i;

  543.     int ct;

  544.     int left, right, diff;

  545.     int deltas[16];

  546.     TM2_INIT_POINTERS();

  547. 

  548.     /* null chroma */

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

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

  551. 

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

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

  554. 

  555.     /* null luma */

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

  557.         deltas[i] = 0;

  558. 

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

  560. 

  561.     if(bx > 0)

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

  563.     else

  564.         left = 0;

  565. 

  566.     right = last[3];

  567.     diff = right - left;

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

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

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

  571.     last[3] = right;

  572.     {

  573.         int tp = left;

  574. 

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

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

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

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

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

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

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

  582.     }

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

  584. }

  585. 

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

  587. {

  588.     int i, j;

  589.     TM2_INIT_POINTERS_2();

  590. 

  591.     /* update chroma */

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

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

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

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

  596.         }

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

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

  599.     }

  600.     U -= Ustride * 2;

  601.     V -= Vstride * 2;

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

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

  604. 

  605.     /* update deltas */

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

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

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

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

  610. 

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

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

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

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

  615.         }

  616.         Y += Ystride;

  617.         Yo += oYstride;

  618.     }

  619. }

  620. 

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

  622. {

  623.     int i, j;

  624.     int d;

  625.     TM2_INIT_POINTERS_2();

  626. 

  627.     /* update chroma */

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

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

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

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

  632.         }

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

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

  635.     }

  636.     U -= Ustride * 2;

  637.     V -= Vstride * 2;

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

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

  640. 

  641.     /* update deltas */

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

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

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

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

  646. 

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

  648.         d = last[3];

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

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

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

  652.         }

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

  654.         Y += Ystride;

  655.         Yo += oYstride;

  656.     }

  657. }

  658. 

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

  660. {

  661.     int i, j;

  662.     int mx, my;

  663.     TM2_INIT_POINTERS_2();

  664. 

  665.     mx = GET_TOK(ctx, TM2_MOT);

  666.     my = GET_TOK(ctx, TM2_MOT);

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

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

  669. 

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

  671.         av_log(0,0, "MV out of picture\n");

  672.         return;

  673.     }

  674. 

  675.     Yo += my * oYstride + mx;

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

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

  678. 

  679.     /* copy chroma */

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

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

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

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

  684.         }

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

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

  687.     }

  688.     U -= Ustride * 2;

  689.     V -= Vstride * 2;

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

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

  692. 

  693.     /* copy luma */

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

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

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

  697.         }

  698.         Y += Ystride;

  699.         Yo += oYstride;

  700.     }

  701.     /* calculate deltas */

  702.     Y -= Ystride * 4;

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

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

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

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

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

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

  709. }

  710. 

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

  712. {

  713.     int i, j;

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

  715.     int type;

  716.     int keyframe = 1;

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

  718.     uint8_t *dst;

  719. 

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

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

  722. 

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

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

  725.         return -1;

  726.     }

  727. 

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

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

  730. 

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

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

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

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

  735.             type = GET_TOK(ctx, TM2_TYPE);

  736.             switch(type) {

  737.             case TM2_HI_RES:

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

  739.                 break;

  740.             case TM2_MED_RES:

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

  742.                 break;

  743.             case TM2_LOW_RES:

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

  745.                 break;

  746.             case TM2_NULL_RES:

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

  748.                 break;

  749.             case TM2_UPDATE:

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

  751.                 keyframe = 0;

  752.                 break;

  753.             case TM2_STILL:

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

  755.                 keyframe = 0;

  756.                 break;

  757.             case TM2_MOTION:

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

  759.                 keyframe = 0;

  760.                 break;

  761.             default:

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

  763.             }

  764.         }

  765.     }

  766. 

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

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

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

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

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

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

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

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

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

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

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

  778.         }

  779. 

  780.         /* horizontal edge extension */

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

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

  783. 

  784.         /* vertical edge extension */

  785.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  795.         }

  796. 

  797.         Y += ctx->y_stride;

  798.         if (j & 1) {

  799.             /* horizontal edge extension */

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

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

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

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

  804. 

  805.             /* vertical edge extension */

  806.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  816.             }

  817. 

  818.             U += ctx->uv_stride;

  819.             V += ctx->uv_stride;

  820.         }

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

  822.     }

  823. 

  824.     return keyframe;

  825. }

  826. 

  827. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  829. };

  830. 

  831. static int decode_frame(AVCodecContext *avctx,

  832.                         void *data, int *data_size,

  833.                         AVPacket *avpkt)

  834. {

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

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

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

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

  839.     int i, skip, t;

  840. 

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

  842.     if(!l->buffer){

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

  844.         return -1;

  845.     }

  846.     p->reference = 3;

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

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

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

  850.         return -1;

  851.     }

  852. 

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

  854.     skip = tm2_read_header(l, l->buffer);

  855. 

  856.     if(skip == -1){

  857.         return -1;

  858.     }

  859. 

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

  861.         if (skip >= buf_size) {

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

  863.             return AVERROR_INVALIDDATA;

  864.         }

  865. 

  866.         t = tm2_read_stream(l, l->buffer + skip, tm2_stream_order[i], buf_size - skip);

  867.         if(t < 0){

  868.             return t;

  869.         }

  870.         skip += t;

  871.     }

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

  873.     if(p->key_frame)

  874.         p->pict_type = AV_PICTURE_TYPE_I;

  875.     else

  876.         p->pict_type = AV_PICTURE_TYPE_P;

  877. 

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

  879.     *data_size = sizeof(AVFrame);

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

  881. 

  882.     return buf_size;

  883. }

  884. 

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

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

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

  888. 

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

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

  891.         return -1;

  892.     }

  893. 

  894.     l->avctx = avctx;

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

  896.     avctx->pix_fmt = PIX_FMT_BGR24;

  897.     avcodec_get_frame_defaults(&l->pic);

  898. 

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

  900. 

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

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

  903. 

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

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

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

  907.     }

  908. 

  909.     w += 8;

  910.     h += 8;

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

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

  913.     l->y_stride = w;

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

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

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

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

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

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

  920.     l->uv_stride = w;

  921.     l->cur = 0;

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

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

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

  925.         av_freep(l->Y1_base);

  926.         av_freep(l->Y2_base);

  927.         av_freep(l->U1_base);

  928.         av_freep(l->U2_base);

  929.         av_freep(l->V1_base);

  930.         av_freep(l->V2_base);

  931.         av_freep(l->last);

  932.         av_freep(l->clast);

  933.         return AVERROR(ENOMEM);

  934.     }

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

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

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

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

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

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

  941. 

  942.     return 0;

  943. }

  944. 

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

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

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

  948.     int i;

  949. 

  950.     av_free(l->last);

  951.     av_free(l->clast);

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

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

  954.     if(l->Y1){

  955.         av_free(l->Y1_base);

  956.         av_free(l->U1_base);

  957.         av_free(l->V1_base);

  958.         av_free(l->Y2_base);

  959.         av_free(l->U2_base);

  960.         av_free(l->V2_base);

  961.     }

  962.     av_freep(&l->buffer);

  963.     l->buffer_size = 0;

  964. 

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

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

  967. 

  968.     return 0;

  969. }

  970. 

  971. AVCodec ff_truemotion2_decoder = {

  972.     .name           = "truemotion2",

  973.     .type           = AVMEDIA_TYPE_VIDEO,

  974.     .id             = AV_CODEC_ID_TRUEMOTION2,

  975.     .priv_data_size = sizeof(TM2Context),

  976.     .init           = decode_init,

  977.     .close          = decode_end,

  978.     .decode         = decode_frame,

  979.     .capabilities   = CODEC_CAP_DR1,

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

  981. };