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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 "get_bits.h"

  29. #include "dsputil.h"

  30. 

  31. #define TM2_ESCAPE 0x80000000

  32. #define TM2_DELTAS 64

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

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

  35.      TM2_UPD, TM2_MOT, TM2_TYPE, TM2_NUM_STREAMS};

  36. /* Block types */

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

  38.                  TM2_UPDATE, TM2_STILL, TM2_MOTION};

  39. 

  40. typedef struct TM2Context{

  41.     AVCodecContext *avctx;

  42.     AVFrame pic;

  43. 

  44.     GetBitContext gb;

  45.     DSPContext dsp;

  46. 

  47.     uint8_t *buffer;

  48.     int buffer_size;

  49. 

  50.     /* TM2 streams */

  51.     int *tokens[TM2_NUM_STREAMS];

  52.     int tok_lens[TM2_NUM_STREAMS];

  53.     int tok_ptrs[TM2_NUM_STREAMS];

  54.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  55.     /* for blocks decoding */

  56.     int D[4];

  57.     int CD[4];

  58.     int *last;

  59.     int *clast;

  60. 

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

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

  63.     int cur;

  64. } TM2Context;

  65. 

  66. /**

  67. * Huffman codes for each of streams

  68. */

  69. typedef struct TM2Codes{

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

  71.     int bits;

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

  73.     int length;

  74. } TM2Codes;

  75. 

  76. /**

  77. * structure for gathering Huffman codes information

  78. */

  79. typedef struct TM2Huff{

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

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

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

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

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

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

  86.     int *nums; ///< literals

  87.     uint32_t *bits; ///< codes

  88.     int *lens; ///< codelengths

  89. } TM2Huff;

  90. 

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

  92. {

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

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

  95.         return -1;

  96.     }

  97. 

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

  99.         if (length == 0) {

  100.             length = 1;

  101.         }

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

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

  104.             return -1;

  105.         }

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

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

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

  109.         huff->num++;

  110.         return 0;

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

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

  113.             return -1;

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

  115.             return -1;

  116.     }

  117.     return 0;

  118. }

  119. 

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

  121. {

  122.     TM2Huff huff;

  123.     int res = 0;

  124. 

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

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

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

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

  129.     huff.num = 0;

  130. 

  131.     /* check for correct codes parameters */

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

  133.        (huff.max_bits < 0) || (huff.max_bits > 32)) {

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

  135.                huff.val_bits, huff.max_bits);

  136.         return -1;

  137.     }

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

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

  140.         return -1;

  141.     }

  142.     /* one-node tree */

  143.     if(huff.max_bits == 0)

  144.         huff.max_bits = 1;

  145. 

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

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

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

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

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

  151. 

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

  153.         res = -1;

  154. 

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

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

  157.                huff.num, huff.max_num);

  158.         res = -1;

  159.     }

  160. 

  161.     /* convert codes to vlc_table */

  162.     if(res != -1) {

  163.         int i;

  164. 

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

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

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

  168.         if(res < 0) {

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

  170.             res = -1;

  171.         } else

  172.             res = 0;

  173.         if(res != -1) {

  174.             code->bits = huff.max_bits;

  175.             code->length = huff.max_num;

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

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

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

  179.         }

  180.     }

  181.     /* free allocated memory */

  182.     av_free(huff.nums);

  183.     av_free(huff.bits);

  184.     av_free(huff.lens);

  185. 

  186.     return res;

  187. }

  188. 

  189. static void tm2_free_codes(TM2Codes *code)

  190. {

  191.     av_free(code->recode);

  192.     if(code->vlc.table)

  193.         free_vlc(&code->vlc);

  194. }

  195. 

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

  197. {

  198.     int val;

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

  200.     return code->recode[val];

  201. }

  202. 

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

  204. {

  205.     uint32_t magic;

  206.     const uint8_t *obuf;

  207. 

  208.     obuf = buf;

  209. 

  210.     magic = AV_RL32(buf);

  211.     buf += 4;

  212. 

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

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

  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.     return buf - obuf;

  224. }

  225. 

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

  227.     int d, mb;

  228.     int i, v;

  229. 

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

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

  232. 

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

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

  235.         return -1;

  236.     }

  237. 

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

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

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

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

  242.         else

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

  244.     }

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

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

  247. 

  248.     return 0;

  249. }

  250. 

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

  252. {

  253.     int i;

  254.     int cur = 0;

  255.     int skip = 0;

  256.     int len, toks;

  257.     TM2Codes codes;

  258. 

  259.     /* get stream length in dwords */

  260.     len = AV_RB32(buf); buf += 4; cur += 4;

  261.     skip = len * 4 + 4;

  262. 

  263.     if(len == 0)

  264.         return 4;

  265. 

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

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

  268.         return -1;

  269.     }

  270. 

  271.     toks = AV_RB32(buf); buf += 4; cur += 4;

  272.     if(toks & 1) {

  273.         len = AV_RB32(buf); buf += 4; cur += 4;

  274.         if(len == TM2_ESCAPE) {

  275.             len = AV_RB32(buf); buf += 4; cur += 4;

  276.         }

  277.         if(len > 0) {

  278.             if (skip <= cur)

  279.                 return -1;

  280.             init_get_bits(&ctx->gb, buf, (skip - cur) * 8);

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

  282.                 return -1;

  283.             buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;

  284.             cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;

  285.         }

  286.     }

  287.     /* skip unused fields */

  288.     if(AV_RB32(buf) == TM2_ESCAPE) {

  289.         buf += 4; cur += 4; /* some unknown length - could be escaped too */

  290.     }

  291.     buf += 4; cur += 4;

  292.     buf += 4; cur += 4; /* unused by decoder */

  293. 

  294.     if (skip <= cur)

  295.         return -1;

  296.     init_get_bits(&ctx->gb, buf, (skip - cur) * 8);

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

  298.         return -1;

  299.     buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;

  300.     cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;

  301. 

  302.     toks >>= 1;

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

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

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

  306.         tm2_free_codes(&codes);

  307.         return -1;

  308.     }

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

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

  311.     len = AV_RB32(buf); buf += 4; cur += 4;

  312.     if(len > 0) {

  313.         if (skip <= cur)

  314.             return -1;

  315.         init_get_bits(&ctx->gb, buf, (skip - cur) * 8);

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

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

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

  319.                 return -1;

  320.             }

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

  322.         }

  323.     } else {

  324.         for(i = 0; i < toks; i++)

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

  326.     }

  327.     tm2_free_codes(&codes);

  328. 

  329.     return skip;

  330. }

  331. 

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

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

  334.         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]);

  335.         return 0;

  336.     }

  337.     if(type <= TM2_MOT)

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

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

  340. }

  341. 

  342. /* blocks decoding routines */

  343. 

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

  345. #define TM2_INIT_POINTERS() \

  346.     int *last, *clast; \

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

  348.     int Ystride, Ustride, Vstride;\

  349. \

  350.     Ystride = ctx->avctx->width;\

  351.     Vstride = (ctx->avctx->width + 1) >> 1;\

  352.     Ustride = (ctx->avctx->width + 1) >> 1;\

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

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

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

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

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

  358. 

  359. #define TM2_INIT_POINTERS_2() \

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

  361.     int oYstride, oUstride, oVstride;\

  362. \

  363.     TM2_INIT_POINTERS();\

  364.     oYstride = Ystride;\

  365.     oVstride = Vstride;\

  366.     oUstride = Ustride;\

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

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

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

  370. 

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

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

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

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

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

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

  377. 

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

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

  380. {

  381.     int ct, d;

  382.     int i, j;

  383. 

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

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

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

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

  388.             ct += d;

  389.             last[i] += ct;

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

  391.         }

  392.         Y += stride;

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

  394.     }

  395. }

  396. 

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

  398. {

  399.     int i, j;

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

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

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

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

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

  405.         }

  406.         data += stride;

  407.     }

  408. }

  409. 

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

  411. {

  412.     int t;

  413.     int l;

  414.     int prev;

  415. 

  416.     if(bx > 0)

  417.         prev = clast[-3];

  418.     else

  419.         prev = 0;

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

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

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

  423.     CD[0] = t;

  424.     clast[0] = l;

  425. 

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

  427. }

  428. 

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

  430. {

  431.     int i;

  432.     int deltas[16];

  433.     TM2_INIT_POINTERS();

  434. 

  435.     /* hi-res chroma */

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

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

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

  439.     }

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

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

  442. 

  443.     /* hi-res luma */

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

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

  446. 

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

  448. }

  449. 

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

  451. {

  452.     int i;

  453.     int deltas[16];

  454.     TM2_INIT_POINTERS();

  455. 

  456.     /* low-res chroma */

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

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

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

  460. 

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

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

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

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

  473. {

  474.     int i;

  475.     int t1, t2;

  476.     int deltas[16];

  477.     TM2_INIT_POINTERS();

  478. 

  479.     /* low-res chroma */

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

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

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

  483. 

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

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

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

  487. 

  488.     /* low-res luma */

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

  490.         deltas[i] = 0;

  491. 

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

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

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

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

  496. 

  497.     if(bx > 0)

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

  499.     else

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

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

  502. 

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

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

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

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

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

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

  509. 

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

  511. }

  512. 

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

  514. {

  515.     int i;

  516.     int ct;

  517.     int left, right, diff;

  518.     int deltas[16];

  519.     TM2_INIT_POINTERS();

  520. 

  521.     /* null chroma */

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

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

  524. 

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

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

  527. 

  528.     /* null luma */

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

  530.         deltas[i] = 0;

  531. 

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

  533. 

  534.     if(bx > 0)

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

  536.     else

  537.         left = 0;

  538. 

  539.     right = last[3];

  540.     diff = right - left;

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

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

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

  544.     last[3] = right;

  545.     {

  546.         int tp = left;

  547. 

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

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

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

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

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

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

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

  555.     }

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

  557. }

  558. 

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

  560. {

  561.     int i, j;

  562.     TM2_INIT_POINTERS_2();

  563. 

  564.     /* update chroma */

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

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

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

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

  569.         }

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

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

  572.     }

  573.     U -= Ustride * 2;

  574.     V -= Vstride * 2;

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

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

  577. 

  578.     /* update deltas */

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

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

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

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

  583. 

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

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

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

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

  588.         }

  589.         Y += Ystride;

  590.         Yo += oYstride;

  591.     }

  592. }

  593. 

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

  595. {

  596.     int i, j;

  597.     int d;

  598.     TM2_INIT_POINTERS_2();

  599. 

  600.     /* update chroma */

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

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

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

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

  605.         }

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

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

  608.     }

  609.     U -= Ustride * 2;

  610.     V -= Vstride * 2;

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

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

  613. 

  614.     /* update deltas */

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

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

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

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

  619. 

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

  621.         d = last[3];

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

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

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

  625.         }

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

  627.         Y += Ystride;

  628.         Yo += oYstride;

  629.     }

  630. }

  631. 

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

  633. {

  634.     int i, j;

  635.     int mx, my;

  636.     TM2_INIT_POINTERS_2();

  637. 

  638.     mx = GET_TOK(ctx, TM2_MOT);

  639.     my = GET_TOK(ctx, TM2_MOT);

  640. 

  641.     Yo += my * oYstride + mx;

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

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

  644. 

  645.     /* copy chroma */

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

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

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

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

  650.         }

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

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

  653.     }

  654.     U -= Ustride * 2;

  655.     V -= Vstride * 2;

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

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

  658. 

  659.     /* copy luma */

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

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

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

  663.         }

  664.         Y += Ystride;

  665.         Yo += oYstride;

  666.     }

  667.     /* calculate deltas */

  668.     Y -= Ystride * 4;

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

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

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

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

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

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

  675. }

  676. 

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

  678. {

  679.     int i, j;

  680.     int bw, bh;

  681.     int type;

  682.     int keyframe = 1;

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

  684.     uint8_t *dst;

  685. 

  686.     bw = ctx->avctx->width >> 2;

  687.     bh = ctx->avctx->height >> 2;

  688. 

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

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

  691. 

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

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

  694.         return -1;

  695.     }

  696. 

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

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

  699. 

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

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

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

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

  704.             type = GET_TOK(ctx, TM2_TYPE);

  705.             switch(type) {

  706.             case TM2_HI_RES:

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

  708.                 break;

  709.             case TM2_MED_RES:

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

  711.                 break;

  712.             case TM2_LOW_RES:

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

  714.                 break;

  715.             case TM2_NULL_RES:

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

  717.                 break;

  718.             case TM2_UPDATE:

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

  720.                 keyframe = 0;

  721.                 break;

  722.             case TM2_STILL:

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

  724.                 keyframe = 0;

  725.                 break;

  726.             case TM2_MOTION:

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

  728.                 keyframe = 0;

  729.                 break;

  730.             default:

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

  732.             }

  733.         }

  734.     }

  735. 

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

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

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

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

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

  741.     for(j = 0; j < ctx->avctx->height; j++){

  742.         for(i = 0; i < ctx->avctx->width; i++){

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

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

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

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

  747.         }

  748.         Y += ctx->avctx->width;

  749.         if (j & 1) {

  750.             U += ctx->avctx->width >> 1;

  751.             V += ctx->avctx->width >> 1;

  752.         }

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

  754.     }

  755. 

  756.     return keyframe;

  757. }

  758. 

  759. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  761. };

  762. 

  763. static int decode_frame(AVCodecContext *avctx,

  764.                         void *data, int *data_size,

  765.                         AVPacket *avpkt)

  766. {

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

  768.     int buf_size = avpkt->size;

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

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

  771.     int i, skip, t;

  772. 

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

  774.     if(!l->buffer){

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

  776.         return -1;

  777.     }

  778.     p->reference = 3;

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

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

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

  782.         return -1;

  783.     }

  784. 

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

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

  787. 

  788.     if(skip == -1){

  789.         return -1;

  790.     }

  791. 

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

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

  794.         if(t == -1){

  795.             return -1;

  796.         }

  797.         skip += t;

  798.     }

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

  800.     if(p->key_frame)

  801.         p->pict_type = AV_PICTURE_TYPE_I;

  802.     else

  803.         p->pict_type = AV_PICTURE_TYPE_P;

  804. 

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

  806.     *data_size = sizeof(AVFrame);

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

  808. 

  809.     return buf_size;

  810. }

  811. 

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

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

  814.     int i;

  815. 

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

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

  818.         return -1;

  819.     }

  820. 

  821.     l->avctx = avctx;

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

  823.     avctx->pix_fmt = PIX_FMT_BGR24;

  824.     avcodec_get_frame_defaults(&l->pic);

  825. 

  826.     dsputil_init(&l->dsp, avctx);

  827. 

  828.     l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));

  829.     l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));

  830. 

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

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

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

  834.     }

  835. 

  836.     l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);

  837.     l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));

  838.     l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));

  839.     l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);

  840.     l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));

  841.     l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));

  842.     l->cur = 0;

  843. 

  844.     return 0;

  845. }

  846. 

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

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

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

  850.     int i;

  851. 

  852.     av_free(l->last);

  853.     av_free(l->clast);

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

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

  856.     if(l->Y1){

  857.         av_free(l->Y1);

  858.         av_free(l->U1);

  859.         av_free(l->V1);

  860.         av_free(l->Y2);

  861.         av_free(l->U2);

  862.         av_free(l->V2);

  863.     }

  864.     av_freep(&l->buffer);

  865.     l->buffer_size = 0;

  866. 

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

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

  869. 

  870.     return 0;

  871. }

  872. 

  873. AVCodec ff_truemotion2_decoder = {

  874.     .name           = "truemotion2",

  875.     .type           = AVMEDIA_TYPE_VIDEO,

  876.     .id             = CODEC_ID_TRUEMOTION2,

  877.     .priv_data_size = sizeof(TM2Context),

  878.     .init           = decode_init,

  879.     .close          = decode_end,

  880.     .decode         = decode_frame,

  881.     .capabilities   = CODEC_CAP_DR1,

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

  883. };