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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.         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.     /* get stream length in dwords */

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

  264.     len  = bytestream2_get_be32(&gb);

  265.     skip = len * 4 + 4;

  266. 

  267.     if(len == 0)

  268.         return 4;

  269. 

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

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

  272.         return -1;

  273.     }

  274. 

  275.     toks = bytestream2_get_be32(&gb);

  276.     if(toks & 1) {

  277.         len = bytestream2_get_be32(&gb);

  278.         if(len == TM2_ESCAPE) {

  279.             len = bytestream2_get_be32(&gb);

  280.         }

  281.         if(len > 0) {

  282.             pos = bytestream2_tell(&gb);

  283.             if (skip <= pos)

  284.                 return -1;

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

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

  287.                 return -1;

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

  289.         }

  290.     }

  291.     /* skip unused fields */

  292.     len = bytestream2_get_be32(&gb);

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

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

  295.     } else {

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

  297.     }

  298. 

  299.     pos = bytestream2_tell(&gb);

  300.     if (skip <= pos)

  301.         return -1;

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

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

  304.         return -1;

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

  306. 

  307.     toks >>= 1;

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

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

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

  311.         tm2_free_codes(&codes);

  312.         return -1;

  313.     }

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

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

  316.     len = bytestream2_get_be32(&gb);

  317.     if(len > 0) {

  318.         pos = bytestream2_tell(&gb);

  319.         if (skip <= pos)

  320.             return -1;

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

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

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

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

  325.                 return -1;

  326.             }

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

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

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

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

  331.                 return AVERROR_INVALIDDATA;

  332.             }

  333.         }

  334.     } else {

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

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

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

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

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

  340.                 return AVERROR_INVALIDDATA;

  341.             }

  342.         }

  343.     }

  344.     tm2_free_codes(&codes);

  345. 

  346.     return skip;

  347. }

  348. 

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

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

  351.         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]);

  352.         return 0;

  353.     }

  354.     if(type <= TM2_MOT)

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

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

  357. }

  358. 

  359. /* blocks decoding routines */

  360. 

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

  362. #define TM2_INIT_POINTERS() \

  363.     int *last, *clast; \

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

  365.     int Ystride, Ustride, Vstride;\

  366. \

  367.     Ystride = ctx->y_stride;\

  368.     Vstride = ctx->uv_stride;\

  369.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  375. 

  376. #define TM2_INIT_POINTERS_2() \

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

  378.     int oYstride, oUstride, oVstride;\

  379. \

  380.     TM2_INIT_POINTERS();\

  381.     oYstride = Ystride;\

  382.     oVstride = Vstride;\

  383.     oUstride = Ustride;\

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

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

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

  387. 

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

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

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

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

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

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

  394. 

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

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

  397. {

  398.     int ct, d;

  399.     int i, j;

  400. 

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

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

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

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

  405.             ct += d;

  406.             last[i] += ct;

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

  408.         }

  409.         Y += stride;

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

  411.     }

  412. }

  413. 

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

  415. {

  416.     int i, j;

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

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

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

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

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

  422.         }

  423.         data += stride;

  424.     }

  425. }

  426. 

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

  428. {

  429.     int t;

  430.     int l;

  431.     int prev;

  432. 

  433.     if(bx > 0)

  434.         prev = clast[-3];

  435.     else

  436.         prev = 0;

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

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

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

  440.     CD[0] = t;

  441.     clast[0] = l;

  442. 

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

  444. }

  445. 

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

  447. {

  448.     int i;

  449.     int deltas[16];

  450.     TM2_INIT_POINTERS();

  451. 

  452.     /* hi-res chroma */

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

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

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

  456.     }

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

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

  459. 

  460.     /* hi-res luma */

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

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

  463. 

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

  465. }

  466. 

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

  468. {

  469.     int i;

  470.     int deltas[16];

  471.     TM2_INIT_POINTERS();

  472. 

  473.     /* low-res chroma */

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

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

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

  477. 

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

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

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

  481. 

  482.     /* hi-res luma */

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

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

  485. 

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

  487. }

  488. 

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

  490. {

  491.     int i;

  492.     int t1, t2;

  493.     int deltas[16];

  494.     TM2_INIT_POINTERS();

  495. 

  496.     /* low-res chroma */

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

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

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

  500. 

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

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

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

  504. 

  505.     /* low-res luma */

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

  507.         deltas[i] = 0;

  508. 

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

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

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

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

  513. 

  514.     if(bx > 0)

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

  516.     else

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

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

  519. 

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

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

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

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

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

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

  526. 

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

  528. }

  529. 

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

  531. {

  532.     int i;

  533.     int ct;

  534.     int left, right, diff;

  535.     int deltas[16];

  536.     TM2_INIT_POINTERS();

  537. 

  538.     /* null chroma */

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

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

  541. 

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

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

  544. 

  545.     /* null luma */

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

  547.         deltas[i] = 0;

  548. 

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

  550. 

  551.     if(bx > 0)

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

  553.     else

  554.         left = 0;

  555. 

  556.     right = last[3];

  557.     diff = right - left;

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

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

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

  561.     last[3] = right;

  562.     {

  563.         int tp = left;

  564. 

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

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

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

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

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

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

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

  572.     }

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

  574. }

  575. 

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

  577. {

  578.     int i, j;

  579.     TM2_INIT_POINTERS_2();

  580. 

  581.     /* update chroma */

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

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

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

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

  586.         }

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

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

  589.     }

  590.     U -= Ustride * 2;

  591.     V -= Vstride * 2;

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

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

  594. 

  595.     /* update deltas */

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

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

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

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

  600. 

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

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

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

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

  605.         }

  606.         Y += Ystride;

  607.         Yo += oYstride;

  608.     }

  609. }

  610. 

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

  612. {

  613.     int i, j;

  614.     int d;

  615.     TM2_INIT_POINTERS_2();

  616. 

  617.     /* update chroma */

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

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

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

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

  622.         }

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

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

  625.     }

  626.     U -= Ustride * 2;

  627.     V -= Vstride * 2;

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

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

  630. 

  631.     /* update deltas */

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

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

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

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

  636. 

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

  638.         d = last[3];

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

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

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

  642.         }

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

  644.         Y += Ystride;

  645.         Yo += oYstride;

  646.     }

  647. }

  648. 

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

  650. {

  651.     int i, j;

  652.     int mx, my;

  653.     TM2_INIT_POINTERS_2();

  654. 

  655.     mx = GET_TOK(ctx, TM2_MOT);

  656.     my = GET_TOK(ctx, TM2_MOT);

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

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

  659. 

  660.     Yo += my * oYstride + mx;

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

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

  663. 

  664.     /* copy chroma */

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

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

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

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

  669.         }

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

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

  672.     }

  673.     U -= Ustride * 2;

  674.     V -= Vstride * 2;

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

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

  677. 

  678.     /* copy luma */

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

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

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

  682.         }

  683.         Y += Ystride;

  684.         Yo += oYstride;

  685.     }

  686.     /* calculate deltas */

  687.     Y -= Ystride * 4;

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

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

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

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

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

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

  694. }

  695. 

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

  697. {

  698.     int i, j;

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

  700.     int type;

  701.     int keyframe = 1;

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

  703.     uint8_t *dst;

  704. 

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

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

  707. 

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

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

  710.         return -1;

  711.     }

  712. 

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

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

  715. 

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

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

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

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

  720.             type = GET_TOK(ctx, TM2_TYPE);

  721.             switch(type) {

  722.             case TM2_HI_RES:

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

  724.                 break;

  725.             case TM2_MED_RES:

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

  727.                 break;

  728.             case TM2_LOW_RES:

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

  730.                 break;

  731.             case TM2_NULL_RES:

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

  733.                 break;

  734.             case TM2_UPDATE:

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

  736.                 keyframe = 0;

  737.                 break;

  738.             case TM2_STILL:

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

  740.                 keyframe = 0;

  741.                 break;

  742.             case TM2_MOTION:

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

  744.                 keyframe = 0;

  745.                 break;

  746.             default:

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

  748.             }

  749.         }

  750.     }

  751. 

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

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

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

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

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

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

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

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

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

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

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

  763.         }

  764. 

  765.         /* horizontal edge extension */

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

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

  768. 

  769.         /* vertical edge extension */

  770.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  780.         }

  781. 

  782.         Y += ctx->y_stride;

  783.         if (j & 1) {

  784.             /* horizontal edge extension */

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

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

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

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

  789. 

  790.             /* vertical edge extension */

  791.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  801.             }

  802. 

  803.             U += ctx->uv_stride;

  804.             V += ctx->uv_stride;

  805.         }

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

  807.     }

  808. 

  809.     return keyframe;

  810. }

  811. 

  812. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  814. };

  815. 

  816. static int decode_frame(AVCodecContext *avctx,

  817.                         void *data, int *data_size,

  818.                         AVPacket *avpkt)

  819. {

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

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

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

  823.     AVFrame * const p= (AVFrame*)&l->pic;

  824.     int i, skip, t;

  825. 

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

  827.     if(!l->buffer){

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

  829.         return -1;

  830.     }

  831.     p->reference = 3;

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

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

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

  835.         return -1;

  836.     }

  837. 

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

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

  840. 

  841.     if(skip == -1){

  842.         return -1;

  843.     }

  844. 

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

  846.         if (skip >= buf_size) {

  847.             return AVERROR_INVALIDDATA;

  848.         }

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

  850.         if(t < 0){

  851.             return t;

  852.         }

  853.         skip += 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.     *data_size = sizeof(AVFrame);

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

  864. 

  865.     return buf_size;

  866. }

  867. 

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

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

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

  871. 

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

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

  874.         return -1;

  875.     }

  876. 

  877.     l->avctx = avctx;

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

  879.     avctx->pix_fmt = PIX_FMT_BGR24;

  880.     avcodec_get_frame_defaults(&l->pic);

  881. 

  882.     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.     av_freep(&l->buffer);

  946.     l->buffer_size = 0;

  947. 

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

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

  950. 

  951.     return 0;

  952. }

  953. 

  954. AVCodec ff_truemotion2_decoder = {

  955.     .name           = "truemotion2",

  956.     .type           = AVMEDIA_TYPE_VIDEO,

  957.     .id             = CODEC_ID_TRUEMOTION2,

  958.     .priv_data_size = sizeof(TM2Context),

  959.     .init           = decode_init,

  960.     .close          = decode_end,

  961.     .decode         = decode_frame,

  962.     .capabilities   = CODEC_CAP_DR1,

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

  964. };