falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45418 Commits
32 Branches
511MB
Tree: efb0e4e7af
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'efb0e4e7af'
${ noResults }
FFmpeg/libavcodec/truemotion2.c

980 lines
29KB
Raw Blame History 

  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_missing_feature(ctx->avctx, "TM2 old header", 1);

  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. 

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

  228.     int d, mb;

  229.     int i, v;

  230. 

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

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

  233. 

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

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

  236.         return -1;

  237.     }

  238. 

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

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

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

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

  243.         else

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

  245.     }

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

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

  248. 

  249.     return 0;

  250. }

  251. 

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

  253. {

  254.     int i;

  255.     int skip = 0;

  256.     int len, toks, pos;

  257.     TM2Codes codes;

  258.     GetByteContext gb;

  259. 

  260.     if (buf_size < 4) {

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

  262.         return AVERROR_INVALIDDATA;

  263.     }

  264. 

  265.     /* get stream length in dwords */

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

  267.     len  = bytestream2_get_be32(&gb);

  268.     skip = len * 4 + 4;

  269. 

  270.     if(len == 0)

  271.         return 4;

  272. 

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

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

  275.         return AVERROR_INVALIDDATA;

  276.     }

  277. 

  278.     toks = bytestream2_get_be32(&gb);

  279.     if(toks & 1) {

  280.         len = bytestream2_get_be32(&gb);

  281.         if(len == TM2_ESCAPE) {

  282.             len = bytestream2_get_be32(&gb);

  283.         }

  284.         if(len > 0) {

  285.             pos = bytestream2_tell(&gb);

  286.             if (skip <= pos)

  287.                 return AVERROR_INVALIDDATA;

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

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

  290.                 return AVERROR_INVALIDDATA;

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

  292.         }

  293.     }

  294.     /* skip unused fields */

  295.     len = bytestream2_get_be32(&gb);

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

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

  298.     } else {

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

  300.     }

  301. 

  302.     pos = bytestream2_tell(&gb);

  303.     if (skip <= pos)

  304.         return AVERROR_INVALIDDATA;

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

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

  307.         return AVERROR_INVALIDDATA;

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

  309. 

  310.     toks >>= 1;

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

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

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

  314.         tm2_free_codes(&codes);

  315.         return AVERROR_INVALIDDATA;

  316.     }

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

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

  319.     len = bytestream2_get_be32(&gb);

  320.     if(len > 0) {

  321.         pos = bytestream2_tell(&gb);

  322.         if (skip <= pos)

  323.             return AVERROR_INVALIDDATA;

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

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

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

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

  328.                 return AVERROR_INVALIDDATA;

  329.             }

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

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

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

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

  334.                 return AVERROR_INVALIDDATA;

  335.             }

  336.         }

  337.     } else {

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

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

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

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

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

  343.                 return AVERROR_INVALIDDATA;

  344.             }

  345.         }

  346.     }

  347.     tm2_free_codes(&codes);

  348. 

  349.     return skip;

  350. }

  351. 

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

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

  354.         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]);

  355.         return 0;

  356.     }

  357.     if(type <= TM2_MOT) {

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

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

  360.             return 0;

  361.         }

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

  363.     }

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

  365. }

  366. 

  367. /* blocks decoding routines */

  368. 

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

  370. #define TM2_INIT_POINTERS() \

  371.     int *last, *clast; \

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

  373.     int Ystride, Ustride, Vstride;\

  374. \

  375.     Ystride = ctx->y_stride;\

  376.     Vstride = ctx->uv_stride;\

  377.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  383. 

  384. #define TM2_INIT_POINTERS_2() \

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

  386.     int oYstride, oUstride, oVstride;\

  387. \

  388.     TM2_INIT_POINTERS();\

  389.     oYstride = Ystride;\

  390.     oVstride = Vstride;\

  391.     oUstride = Ustride;\

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

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

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

  395. 

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

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

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

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

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

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

  402. 

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

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

  405. {

  406.     int ct, d;

  407.     int i, j;

  408. 

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

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

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

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

  413.             ct += d;

  414.             last[i] += ct;

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

  416.         }

  417.         Y += stride;

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

  419.     }

  420. }

  421. 

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

  423. {

  424.     int i, j;

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

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

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

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

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

  430.         }

  431.         data += stride;

  432.     }

  433. }

  434. 

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

  436. {

  437.     int t;

  438.     int l;

  439.     int prev;

  440. 

  441.     if(bx > 0)

  442.         prev = clast[-3];

  443.     else

  444.         prev = 0;

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

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

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

  448.     CD[0] = t;

  449.     clast[0] = l;

  450. 

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

  452. }

  453. 

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

  455. {

  456.     int i;

  457.     int deltas[16];

  458.     TM2_INIT_POINTERS();

  459. 

  460.     /* hi-res chroma */

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

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

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

  464.     }

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

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

  467. 

  468.     /* hi-res luma */

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

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

  471. 

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

  473. }

  474. 

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

  476. {

  477.     int i;

  478.     int deltas[16];

  479.     TM2_INIT_POINTERS();

  480. 

  481.     /* low-res chroma */

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

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

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

  485. 

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

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

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

  489. 

  490.     /* hi-res luma */

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

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

  493. 

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

  495. }

  496. 

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

  498. {

  499.     int i;

  500.     int t1, t2;

  501.     int deltas[16];

  502.     TM2_INIT_POINTERS();

  503. 

  504.     /* low-res chroma */

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

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

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

  508. 

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

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

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

  512. 

  513.     /* low-res luma */

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

  515.         deltas[i] = 0;

  516. 

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

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

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

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

  521. 

  522.     if(bx > 0)

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

  524.     else

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

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

  527. 

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

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

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

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

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

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

  534. 

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

  536. }

  537. 

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

  539. {

  540.     int i;

  541.     int ct;

  542.     int left, right, diff;

  543.     int deltas[16];

  544.     TM2_INIT_POINTERS();

  545. 

  546.     /* null chroma */

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

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

  549. 

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

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

  552. 

  553.     /* null luma */

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

  555.         deltas[i] = 0;

  556. 

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

  558. 

  559.     if(bx > 0)

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

  561.     else

  562.         left = 0;

  563. 

  564.     right = last[3];

  565.     diff = right - left;

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

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

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

  569.     last[3] = right;

  570.     {

  571.         int tp = left;

  572. 

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

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

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

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

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

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

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

  580.     }

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

  582. }

  583. 

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

  585. {

  586.     int i, j;

  587.     TM2_INIT_POINTERS_2();

  588. 

  589.     /* update chroma */

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

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

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

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

  594.         }

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

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

  597.     }

  598.     U -= Ustride * 2;

  599.     V -= Vstride * 2;

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

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

  602. 

  603.     /* update deltas */

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

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

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

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

  608. 

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

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

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

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

  613.         }

  614.         Y += Ystride;

  615.         Yo += oYstride;

  616.     }

  617. }

  618. 

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

  620. {

  621.     int i, j;

  622.     int d;

  623.     TM2_INIT_POINTERS_2();

  624. 

  625.     /* update chroma */

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

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

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

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

  630.         }

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

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

  633.     }

  634.     U -= Ustride * 2;

  635.     V -= Vstride * 2;

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

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

  638. 

  639.     /* update deltas */

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

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

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

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

  644. 

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

  646.         d = last[3];

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

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

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

  650.         }

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

  652.         Y += Ystride;

  653.         Yo += oYstride;

  654.     }

  655. }

  656. 

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

  658. {

  659.     int i, j;

  660.     int mx, my;

  661.     TM2_INIT_POINTERS_2();

  662. 

  663.     mx = GET_TOK(ctx, TM2_MOT);

  664.     my = GET_TOK(ctx, TM2_MOT);

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

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

  667. 

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

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

  670.         return;

  671.     }

  672. 

  673.     Yo += my * oYstride + mx;

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

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

  676. 

  677.     /* copy chroma */

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

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

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

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

  682.         }

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

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

  685.     }

  686.     U -= Ustride * 2;

  687.     V -= Vstride * 2;

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

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

  690. 

  691.     /* copy luma */

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

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

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

  695.         }

  696.         Y += Ystride;

  697.         Yo += oYstride;

  698.     }

  699.     /* calculate deltas */

  700.     Y -= Ystride * 4;

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

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

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

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

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

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

  707. }

  708. 

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

  710. {

  711.     int i, j;

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

  713.     int type;

  714.     int keyframe = 1;

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

  716.     uint8_t *dst;

  717. 

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

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

  720. 

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

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

  723.         return -1;

  724.     }

  725. 

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

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

  728. 

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

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

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

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

  733.             type = GET_TOK(ctx, TM2_TYPE);

  734.             switch(type) {

  735.             case TM2_HI_RES:

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

  737.                 break;

  738.             case TM2_MED_RES:

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

  740.                 break;

  741.             case TM2_LOW_RES:

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

  743.                 break;

  744.             case TM2_NULL_RES:

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

  746.                 break;

  747.             case TM2_UPDATE:

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

  749.                 keyframe = 0;

  750.                 break;

  751.             case TM2_STILL:

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

  753.                 keyframe = 0;

  754.                 break;

  755.             case TM2_MOTION:

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

  757.                 keyframe = 0;

  758.                 break;

  759.             default:

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

  761.             }

  762.         }

  763.     }

  764. 

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

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

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

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

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

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

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

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

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

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

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

  776.         }

  777. 

  778.         /* horizontal edge extension */

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

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

  781. 

  782.         /* vertical edge extension */

  783.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  793.         }

  794. 

  795.         Y += ctx->y_stride;

  796.         if (j & 1) {

  797.             /* horizontal edge extension */

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

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

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

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

  802. 

  803.             /* vertical edge extension */

  804.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  814.             }

  815. 

  816.             U += ctx->uv_stride;

  817.             V += ctx->uv_stride;

  818.         }

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

  820.     }

  821. 

  822.     return keyframe;

  823. }

  824. 

  825. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  827. };

  828. 

  829. static int decode_frame(AVCodecContext *avctx,

  830.                         void *data, int *data_size,

  831.                         AVPacket *avpkt)

  832. {

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

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

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

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

  837.     int i, ret, skip, t;

  838. 

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

  840.     if(!l->buffer){

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

  842.         return AVERROR(ENOMEM);

  843.     }

  844.     p->reference = 3;

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

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

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

  848.         return ret;

  849.     }

  850. 

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

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

  853. 

  854.     if(skip == -1){

  855.         return AVERROR_INVALIDDATA;

  856.     }

  857. 

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

  859.         if (skip >= buf_size) {

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

  861.             return AVERROR_INVALIDDATA;

  862.         }

  863. 

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

  865.         if(t < 0){

  866.             return t;

  867.         }

  868.         skip += t;

  869.     }

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

  871.     if(p->key_frame)

  872.         p->pict_type = AV_PICTURE_TYPE_I;

  873.     else

  874.         p->pict_type = AV_PICTURE_TYPE_P;

  875. 

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

  877.     *data_size = sizeof(AVFrame);

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

  879. 

  880.     return buf_size;

  881. }

  882. 

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

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

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

  886. 

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

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

  889.         return AVERROR_INVALIDDATA;

  890.     }

  891. 

  892.     l->avctx = avctx;

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

  894.     avctx->pix_fmt = AV_PIX_FMT_BGR24;

  895.     avcodec_get_frame_defaults(&l->pic);

  896. 

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

  898. 

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

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

  901. 

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

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

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

  905.     }

  906. 

  907.     w += 8;

  908.     h += 8;

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

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

  911.     l->y_stride = w;

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

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

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

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

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

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

  918.     l->uv_stride = w;

  919.     l->cur = 0;

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

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

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

  923.         av_freep(l->Y1_base);

  924.         av_freep(l->Y2_base);

  925.         av_freep(l->U1_base);

  926.         av_freep(l->U2_base);

  927.         av_freep(l->V1_base);

  928.         av_freep(l->V2_base);

  929.         av_freep(l->last);

  930.         av_freep(l->clast);

  931.         return AVERROR(ENOMEM);

  932.     }

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

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

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

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

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

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

  939. 

  940.     return 0;

  941. }

  942. 

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

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

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

  946.     int i;

  947. 

  948.     av_free(l->last);

  949.     av_free(l->clast);

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

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

  952.     if(l->Y1){

  953.         av_free(l->Y1_base);

  954.         av_free(l->U1_base);

  955.         av_free(l->V1_base);

  956.         av_free(l->Y2_base);

  957.         av_free(l->U2_base);

  958.         av_free(l->V2_base);

  959.     }

  960.     av_freep(&l->buffer);

  961.     l->buffer_size = 0;

  962. 

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

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

  965. 

  966.     return 0;

  967. }

  968. 

  969. AVCodec ff_truemotion2_decoder = {

  970.     .name           = "truemotion2",

  971.     .type           = AVMEDIA_TYPE_VIDEO,

  972.     .id             = AV_CODEC_ID_TRUEMOTION2,

  973.     .priv_data_size = sizeof(TM2Context),

  974.     .init           = decode_init,

  975.     .close          = decode_end,

  976.     .decode         = decode_frame,

  977.     .capabilities   = CODEC_CAP_DR1,

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

  979. };