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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. 

  210.     magic = AV_RL32(buf);

  211.     buf += 4;

  212. 

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

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

  215.         return 40;

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

  217.         return 40;

  218.     } else {

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

  220.         return -1;

  221.     }

  222. }

  223. 

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

  225.     int d, mb;

  226.     int i, v;

  227. 

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

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

  230. 

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

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

  233.         return -1;

  234.     }

  235. 

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

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

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

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

  240.         else

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

  242.     }

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

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

  245. 

  246.     return 0;

  247. }

  248. 

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

  250. {

  251.     int i;

  252.     int skip = 0;

  253.     int len, toks, pos;

  254.     TM2Codes codes;

  255.     GetByteContext gb;

  256. 

  257.     if (buf_size < 4) {

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

  259.         return AVERROR_INVALIDDATA;

  260.     }

  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 || skip > buf_size) {

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

  272.         return AVERROR_INVALIDDATA;

  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 AVERROR_INVALIDDATA;

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

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

  287.                 return AVERROR_INVALIDDATA;

  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 AVERROR_INVALIDDATA;

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

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

  304.         return AVERROR_INVALIDDATA;

  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 AVERROR_INVALIDDATA;

  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 AVERROR_INVALIDDATA;

  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 AVERROR_INVALIDDATA;

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

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

  357.             return 0;

  358.         }

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

  360.     }

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

  362. }

  363. 

  364. /* blocks decoding routines */

  365. 

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

  367. #define TM2_INIT_POINTERS() \

  368.     int *last, *clast; \

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

  370.     int Ystride, Ustride, Vstride;\

  371. \

  372.     Ystride = ctx->y_stride;\

  373.     Vstride = ctx->uv_stride;\

  374.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  380. 

  381. #define TM2_INIT_POINTERS_2() \

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

  383.     int oYstride, oUstride, oVstride;\

  384. \

  385.     TM2_INIT_POINTERS();\

  386.     oYstride = Ystride;\

  387.     oVstride = Vstride;\

  388.     oUstride = Ustride;\

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

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

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

  392. 

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

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

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

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

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

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

  399. 

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

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

  402. {

  403.     int ct, d;

  404.     int i, j;

  405. 

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

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

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

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

  410.             ct += d;

  411.             last[i] += ct;

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

  413.         }

  414.         Y += stride;

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

  416.     }

  417. }

  418. 

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

  420. {

  421.     int i, j;

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

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

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

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

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

  427.         }

  428.         data += stride;

  429.     }

  430. }

  431. 

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

  433. {

  434.     int t;

  435.     int l;

  436.     int prev;

  437. 

  438.     if(bx > 0)

  439.         prev = clast[-3];

  440.     else

  441.         prev = 0;

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

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

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

  445.     CD[0] = t;

  446.     clast[0] = l;

  447. 

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

  449. }

  450. 

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

  452. {

  453.     int i;

  454.     int deltas[16];

  455.     TM2_INIT_POINTERS();

  456. 

  457.     /* hi-res chroma */

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

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

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

  461.     }

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

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

  464. 

  465.     /* hi-res luma */

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

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

  468. 

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

  470. }

  471. 

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

  473. {

  474.     int i;

  475.     int deltas[16];

  476.     TM2_INIT_POINTERS();

  477. 

  478.     /* low-res chroma */

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

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

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

  482. 

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

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

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

  486. 

  487.     /* hi-res luma */

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

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

  490. 

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

  492. }

  493. 

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

  495. {

  496.     int i;

  497.     int t1, t2;

  498.     int deltas[16];

  499.     TM2_INIT_POINTERS();

  500. 

  501.     /* low-res chroma */

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

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

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

  505. 

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

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

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

  509. 

  510.     /* low-res luma */

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

  512.         deltas[i] = 0;

  513. 

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

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

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

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

  518. 

  519.     if(bx > 0)

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

  521.     else

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

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

  524. 

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

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

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

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

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

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

  531. 

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

  533. }

  534. 

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

  536. {

  537.     int i;

  538.     int ct;

  539.     int left, right, diff;

  540.     int deltas[16];

  541.     TM2_INIT_POINTERS();

  542. 

  543.     /* null chroma */

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

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

  546. 

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

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

  549. 

  550.     /* null luma */

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

  552.         deltas[i] = 0;

  553. 

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

  555. 

  556.     if(bx > 0)

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

  558.     else

  559.         left = 0;

  560. 

  561.     right = last[3];

  562.     diff = right - left;

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

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

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

  566.     last[3] = right;

  567.     {

  568.         int tp = left;

  569. 

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

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

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

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

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

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

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

  577.     }

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

  579. }

  580. 

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

  582. {

  583.     int i, j;

  584.     TM2_INIT_POINTERS_2();

  585. 

  586.     /* update chroma */

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

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

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

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

  591.         }

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

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

  594.     }

  595.     U -= Ustride * 2;

  596.     V -= Vstride * 2;

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

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

  599. 

  600.     /* update deltas */

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

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

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

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

  605. 

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

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

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

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

  610.         }

  611.         Y += Ystride;

  612.         Yo += oYstride;

  613.     }

  614. }

  615. 

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

  617. {

  618.     int i, j;

  619.     int d;

  620.     TM2_INIT_POINTERS_2();

  621. 

  622.     /* update chroma */

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

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

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

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

  627.         }

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

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

  630.     }

  631.     U -= Ustride * 2;

  632.     V -= Vstride * 2;

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

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

  635. 

  636.     /* update deltas */

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

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

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

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

  641. 

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

  643.         d = last[3];

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

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

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

  647.         }

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

  649.         Y += Ystride;

  650.         Yo += oYstride;

  651.     }

  652. }

  653. 

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

  655. {

  656.     int i, j;

  657.     int mx, my;

  658.     TM2_INIT_POINTERS_2();

  659. 

  660.     mx = GET_TOK(ctx, TM2_MOT);

  661.     my = GET_TOK(ctx, TM2_MOT);

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

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

  664. 

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

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

  667.         return;

  668.     }

  669. 

  670.     Yo += my * oYstride + mx;

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

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

  673. 

  674.     /* copy chroma */

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

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

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

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

  679.         }

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

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

  682.     }

  683.     U -= Ustride * 2;

  684.     V -= Vstride * 2;

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

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

  687. 

  688.     /* copy luma */

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

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

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

  692.         }

  693.         Y += Ystride;

  694.         Yo += oYstride;

  695.     }

  696.     /* calculate deltas */

  697.     Y -= Ystride * 4;

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

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

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

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

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

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

  704. }

  705. 

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

  707. {

  708.     int i, j;

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

  710.     int type;

  711.     int keyframe = 1;

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

  713.     uint8_t *dst;

  714. 

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

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

  717. 

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

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

  720.         return -1;

  721.     }

  722. 

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

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

  725. 

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

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

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

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

  730.             type = GET_TOK(ctx, TM2_TYPE);

  731.             switch(type) {

  732.             case TM2_HI_RES:

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

  734.                 break;

  735.             case TM2_MED_RES:

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

  737.                 break;

  738.             case TM2_LOW_RES:

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

  740.                 break;

  741.             case TM2_NULL_RES:

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

  743.                 break;

  744.             case TM2_UPDATE:

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

  746.                 keyframe = 0;

  747.                 break;

  748.             case TM2_STILL:

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

  750.                 keyframe = 0;

  751.                 break;

  752.             case TM2_MOTION:

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

  754.                 keyframe = 0;

  755.                 break;

  756.             default:

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

  758.             }

  759.         }

  760.     }

  761. 

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

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

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

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

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

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

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

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

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

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

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

  773.         }

  774. 

  775.         /* horizontal edge extension */

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

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

  778. 

  779.         /* vertical edge extension */

  780.         if (j == 0) {

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

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

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

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

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

  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.         }

  791. 

  792.         Y += ctx->y_stride;

  793.         if (j & 1) {

  794.             /* horizontal edge extension */

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

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

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

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

  799. 

  800.             /* vertical edge extension */

  801.             if (j == 1) {

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

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

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

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

  806.             } else if (j == h - 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.             }

  812. 

  813.             U += ctx->uv_stride;

  814.             V += ctx->uv_stride;

  815.         }

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

  817.     }

  818. 

  819.     return keyframe;

  820. }

  821. 

  822. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  824. };

  825. 

  826. static int decode_frame(AVCodecContext *avctx,

  827.                         void *data, int *data_size,

  828.                         AVPacket *avpkt)

  829. {

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

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

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

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

  834.     int i, ret, skip, t;

  835. 

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

  837.     if(!l->buffer){

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

  839.         return AVERROR(ENOMEM);

  840.     }

  841.     p->reference = 3;

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

  843.     if((ret = avctx->reget_buffer(avctx, p)) < 0){

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

  845.         return ret;

  846.     }

  847. 

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

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

  850. 

  851.     if(skip == -1){

  852.         return AVERROR_INVALIDDATA;

  853.     }

  854. 

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

  856.         if (skip >= buf_size) {

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

  858.             return AVERROR_INVALIDDATA;

  859.         }

  860. 

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

  862.         if(t < 0){

  863.             return t;

  864.         }

  865.         skip += t;

  866.     }

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

  868.     if(p->key_frame)

  869.         p->pict_type = AV_PICTURE_TYPE_I;

  870.     else

  871.         p->pict_type = AV_PICTURE_TYPE_P;

  872. 

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

  874.     *data_size = sizeof(AVFrame);

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

  876. 

  877.     return buf_size;

  878. }

  879. 

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

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

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

  883. 

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

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

  886.         return AVERROR_INVALIDDATA;

  887.     }

  888. 

  889.     l->avctx = avctx;

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

  891.     avctx->pix_fmt = AV_PIX_FMT_BGR24;

  892.     avcodec_get_frame_defaults(&l->pic);

  893. 

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

  895. 

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

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

  898. 

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

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

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

  902.     }

  903. 

  904.     w += 8;

  905.     h += 8;

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

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

  908.     l->y_stride = w;

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

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

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

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

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

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

  915.     l->uv_stride = w;

  916.     l->cur = 0;

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

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

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

  920.         av_freep(l->Y1_base);

  921.         av_freep(l->Y2_base);

  922.         av_freep(l->U1_base);

  923.         av_freep(l->U2_base);

  924.         av_freep(l->V1_base);

  925.         av_freep(l->V2_base);

  926.         av_freep(l->last);

  927.         av_freep(l->clast);

  928.         return AVERROR(ENOMEM);

  929.     }

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

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

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

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

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

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

  936. 

  937.     return 0;

  938. }

  939. 

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

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

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

  943.     int i;

  944. 

  945.     av_free(l->last);

  946.     av_free(l->clast);

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

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

  949.     if(l->Y1){

  950.         av_free(l->Y1_base);

  951.         av_free(l->U1_base);

  952.         av_free(l->V1_base);

  953.         av_free(l->Y2_base);

  954.         av_free(l->U2_base);

  955.         av_free(l->V2_base);

  956.     }

  957.     av_freep(&l->buffer);

  958.     l->buffer_size = 0;

  959. 

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

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

  962. 

  963.     return 0;

  964. }

  965. 

  966. AVCodec ff_truemotion2_decoder = {

  967.     .name           = "truemotion2",

  968.     .type           = AVMEDIA_TYPE_VIDEO,

  969.     .id             = AV_CODEC_ID_TRUEMOTION2,

  970.     .priv_data_size = sizeof(TM2Context),

  971.     .init           = decode_init,

  972.     .close          = decode_end,

  973.     .decode         = decode_frame,

  974.     .capabilities   = CODEC_CAP_DR1,

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

  976. };