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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 <inttypes.h>

  28. 

  29. #include "avcodec.h"

  30. #include "bswapdsp.h"

  31. #include "bytestream.h"

  32. #include "get_bits.h"

  33. #include "internal.h"

  34. 

  35. #define TM2_ESCAPE 0x80000000

  36. #define TM2_DELTAS 64

  37. 

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

  39. enum TM2_STREAMS {

  40.     TM2_C_HI = 0,

  41.     TM2_C_LO,

  42.     TM2_L_HI,

  43.     TM2_L_LO,

  44.     TM2_UPD,

  45.     TM2_MOT,

  46.     TM2_TYPE,

  47.     TM2_NUM_STREAMS

  48. };

  49. 

  50. /* Block types */

  51. enum TM2_BLOCKS {

  52.     TM2_HI_RES = 0,

  53.     TM2_MED_RES,

  54.     TM2_LOW_RES,

  55.     TM2_NULL_RES,

  56.     TM2_UPDATE,

  57.     TM2_STILL,

  58.     TM2_MOTION

  59. };

  60. 

  61. typedef struct TM2Context {

  62.     AVCodecContext *avctx;

  63.     AVFrame *pic;

  64. 

  65.     GetBitContext gb;

  66.     BswapDSPContext bdsp;

  67. 

  68.     uint8_t *buffer;

  69.     int buffer_size;

  70. 

  71.     /* TM2 streams */

  72.     int *tokens[TM2_NUM_STREAMS];

  73.     int tok_lens[TM2_NUM_STREAMS];

  74.     int tok_ptrs[TM2_NUM_STREAMS];

  75.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  76.     /* for blocks decoding */

  77.     int D[4];

  78.     int CD[4];

  79.     int *last;

  80.     int *clast;

  81. 

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

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

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

  85.     int y_stride, uv_stride;

  86.     int cur;

  87. } TM2Context;

  88. 

  89. /**

  90. * Huffman codes for each of streams

  91. */

  92. typedef struct TM2Codes {

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

  94.     int bits;

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

  96.     int length;

  97. } TM2Codes;

  98. 

  99. /**

  100. * structure for gathering Huffman codes information

  101. */

  102. typedef struct TM2Huff {

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

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

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

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

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

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

  109.     int *nums; ///< literals

  110.     uint32_t *bits; ///< codes

  111.     int *lens; ///< codelengths

  112. } TM2Huff;

  113. 

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

  115. {

  116.     int ret;

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

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

  119.                huff->max_bits);

  120.         return AVERROR_INVALIDDATA;

  121.     }

  122. 

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

  124.         if (length == 0) {

  125.             length = 1;

  126.         }

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

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

  129.             return AVERROR_INVALIDDATA;

  130.         }

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

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

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

  134.         huff->num++;

  135.         return 0;

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

  137.         if ((ret = tm2_read_tree(ctx, prefix << 1, length + 1, huff)) < 0)

  138.             return ret;

  139.         if ((ret = tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff)) < 0)

  140.             return ret;

  141.     }

  142.     return 0;

  143. }

  144. 

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

  146. {

  147.     TM2Huff huff;

  148.     int res = 0;

  149. 

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

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

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

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

  154.     huff.num      = 0;

  155. 

  156.     /* check for correct codes parameters */

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

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

  159.         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal "

  160.                "length: %i, max code length: %i\n", huff.val_bits, huff.max_bits);

  161.         return AVERROR_INVALIDDATA;

  162.     }

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

  164.         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree "

  165.                "nodes: %i\n", huff.nodes);

  166.         return AVERROR_INVALIDDATA;

  167.     }

  168.     /* one-node tree */

  169.     if (huff.max_bits == 0)

  170.         huff.max_bits = 1;

  171. 

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

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

  174.     huff.nums    = av_calloc(huff.max_num, sizeof(int));

  175.     huff.bits    = av_calloc(huff.max_num, sizeof(uint32_t));

  176.     huff.lens    = av_calloc(huff.max_num, sizeof(int));

  177. 

  178.     if (!huff.nums || !huff.bits || !huff.lens) {

  179.         res = AVERROR(ENOMEM);

  180.         goto out;

  181.     }

  182. 

  183.     res = tm2_read_tree(ctx, 0, 0, &huff);

  184. 

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

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

  187.                huff.num, huff.max_num);

  188.         res = AVERROR_INVALIDDATA;

  189.     }

  190. 

  191.     /* convert codes to vlc_table */

  192.     if (res >= 0) {

  193.         int i;

  194. 

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

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

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

  198.         if (res < 0)

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

  200.         else {

  201.             code->bits = huff.max_bits;

  202.             code->length = huff.max_num;

  203.             code->recode = av_malloc_array(code->length, sizeof(int));

  204.             if (!code->recode) {

  205.                 res = AVERROR(ENOMEM);

  206.                 goto out;

  207.             }

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

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

  210.         }

  211.     }

  212. 

  213. out:

  214.     /* free allocated memory */

  215.     av_free(huff.nums);

  216.     av_free(huff.bits);

  217.     av_free(huff.lens);

  218. 

  219.     return res;

  220. }

  221. 

  222. static void tm2_free_codes(TM2Codes *code)

  223. {

  224.     av_free(code->recode);

  225.     if (code->vlc.table)

  226.         ff_free_vlc(&code->vlc);

  227. }

  228. 

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

  230. {

  231.     int val;

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

  233.     if(val<0)

  234.         return -1;

  235.     return code->recode[val];

  236. }

  237. 

  238. #define TM2_OLD_HEADER_MAGIC 0x00000100

  239. #define TM2_NEW_HEADER_MAGIC 0x00000101

  240. 

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

  242. {

  243.     uint32_t magic = AV_RL32(buf);

  244. 

  245.     switch (magic) {

  246.     case TM2_OLD_HEADER_MAGIC:

  247.         avpriv_request_sample(ctx->avctx, "Old TM2 header");

  248.         return 0;

  249.     case TM2_NEW_HEADER_MAGIC:

  250.         return 0;

  251.     default:

  252.         av_log(ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08"PRIX32"\n",

  253.                magic);

  254.         return AVERROR_INVALIDDATA;

  255.     }

  256. }

  257. 

  258. static int tm2_read_deltas(TM2Context *ctx, int stream_id)

  259. {

  260.     int d, mb;

  261.     int i, v;

  262. 

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

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

  265. 

  266.     av_assert2(mb < 32);

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

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

  269.         return AVERROR_INVALIDDATA;

  270.     }

  271. 

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

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

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

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

  276.         else

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

  278.     }

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

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

  281. 

  282.     return 0;

  283. }

  284. 

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

  286. {

  287.     int i, ret;

  288.     int skip = 0;

  289.     int len, toks, pos;

  290.     TM2Codes codes;

  291.     GetByteContext gb;

  292. 

  293.     if (buf_size < 4) {

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

  295.         return AVERROR_INVALIDDATA;

  296.     }

  297. 

  298.     /* get stream length in dwords */

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

  300.     len  = bytestream2_get_be32(&gb);

  301.     skip = len * 4 + 4;

  302. 

  303.     if (len == 0)

  304.         return 4;

  305. 

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

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

  308.         return AVERROR_INVALIDDATA;

  309.     }

  310. 

  311.     toks = bytestream2_get_be32(&gb);

  312.     if (toks & 1) {

  313.         len = bytestream2_get_be32(&gb);

  314.         if (len == TM2_ESCAPE) {

  315.             len = bytestream2_get_be32(&gb);

  316.         }

  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.             if ((ret = tm2_read_deltas(ctx, stream_id)) < 0)

  323.                 return ret;

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

  325.         }

  326.     }

  327.     /* skip unused fields */

  328.     len = bytestream2_get_be32(&gb);

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

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

  331.     } else {

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

  333.     }

  334. 

  335.     pos = bytestream2_tell(&gb);

  336.     if (skip <= pos)

  337.         return AVERROR_INVALIDDATA;

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

  339.     if ((ret = tm2_build_huff_table(ctx, &codes)) < 0)

  340.         return ret;

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

  342. 

  343.     toks >>= 1;

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

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

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

  347.         tm2_free_codes(&codes);

  348.         return AVERROR_INVALIDDATA;

  349.     }

  350.     ret = av_reallocp_array(&ctx->tokens[stream_id], toks, sizeof(int));

  351.     if (ret < 0) {

  352.         ctx->tok_lens[stream_id] = 0;

  353.         return ret;

  354.     }

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

  356.     len = bytestream2_get_be32(&gb);

  357.     if (len > 0) {

  358.         pos = bytestream2_tell(&gb);

  359.         if (skip <= pos)

  360.             return AVERROR_INVALIDDATA;

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

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

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

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

  365.                 return AVERROR_INVALIDDATA;

  366.             }

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

  368.             if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS || ctx->tokens[stream_id][i]<0) {

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

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

  371.                 return AVERROR_INVALIDDATA;

  372.             }

  373.         }

  374.     } else {

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

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

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

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

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

  380.                 return AVERROR_INVALIDDATA;

  381.             }

  382.         }

  383.     }

  384.     tm2_free_codes(&codes);

  385. 

  386.     return skip;

  387. }

  388. 

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

  390. {

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

  392.         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]);

  393.         return 0;

  394.     }

  395.     if (type <= TM2_MOT) {

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

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

  398.             return 0;

  399.         }

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

  401.     }

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

  403. }

  404. 

  405. /* blocks decoding routines */

  406. 

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

  408. #define TM2_INIT_POINTERS() \

  409.     int *last, *clast; \

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

  411.     int Ystride, Ustride, Vstride;\

  412. \

  413.     Ystride = ctx->y_stride;\

  414.     Vstride = ctx->uv_stride;\

  415.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  421. 

  422. #define TM2_INIT_POINTERS_2() \

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

  424.     int oYstride, oUstride, oVstride;\

  425. \

  426.     TM2_INIT_POINTERS();\

  427.     oYstride = Ystride;\

  428.     oVstride = Vstride;\

  429.     oUstride = Ustride;\

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

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

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

  433. 

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

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

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

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

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

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

  440. 

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

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

  443. {

  444.     int ct, d;

  445.     int i, j;

  446. 

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

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

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

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

  451.             ct      += d;

  452.             last[i] += ct;

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

  454.         }

  455.         Y        += stride;

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

  457.     }

  458. }

  459. 

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

  461. {

  462.     int i, j;

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

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

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

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

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

  468.         }

  469.         data += stride;

  470.     }

  471. }

  472. 

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

  474. {

  475.     int t;

  476.     int l;

  477.     int prev;

  478. 

  479.     if (bx > 0)

  480.         prev = clast[-3];

  481.     else

  482.         prev = 0;

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

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

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

  486.     CD[0]    = t;

  487.     clast[0] = l;

  488. 

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

  490. }

  491. 

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

  493. {

  494.     int i;

  495.     int deltas[16];

  496.     TM2_INIT_POINTERS();

  497. 

  498.     /* hi-res chroma */

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

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

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

  502.     }

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

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

  505. 

  506.     /* hi-res luma */

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

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

  509. 

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

  511. }

  512. 

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

  514. {

  515.     int i;

  516.     int deltas[16];

  517.     TM2_INIT_POINTERS();

  518. 

  519.     /* low-res chroma */

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

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

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

  523. 

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

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

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

  527. 

  528.     /* hi-res luma */

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

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

  531. 

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

  533. }

  534. 

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

  536. {

  537.     int i;

  538.     int t1, t2;

  539.     int deltas[16];

  540.     TM2_INIT_POINTERS();

  541. 

  542.     /* low-res chroma */

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

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

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

  546. 

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

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

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

  550. 

  551.     /* low-res luma */

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

  553.         deltas[i] = 0;

  554. 

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

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

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

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

  559. 

  560.     if (bx > 0)

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

  562.     else

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

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

  565. 

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

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

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

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

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

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

  572. 

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

  574. }

  575. 

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

  577. {

  578.     int i;

  579.     int ct;

  580.     int left, right, diff;

  581.     int deltas[16];

  582.     TM2_INIT_POINTERS();

  583. 

  584.     /* null chroma */

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

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

  587. 

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

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

  590. 

  591.     /* null luma */

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

  593.         deltas[i] = 0;

  594. 

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

  596. 

  597.     if (bx > 0)

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

  599.     else

  600.         left = 0;

  601. 

  602.     right   = last[3];

  603.     diff    = right - left;

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

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

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

  607.     last[3] = right;

  608.     {

  609.         int tp = left;

  610. 

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

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

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

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

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

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

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

  618.     }

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

  620. }

  621. 

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

  623. {

  624.     int i, j;

  625.     TM2_INIT_POINTERS_2();

  626. 

  627.     /* update chroma */

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

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

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

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

  632.         }

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

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

  635.     }

  636.     U -= Ustride * 2;

  637.     V -= Vstride * 2;

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

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

  640. 

  641.     /* update deltas */

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

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

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

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

  646. 

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

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

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

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

  651.         }

  652.         Y  += Ystride;

  653.         Yo += oYstride;

  654.     }

  655. }

  656. 

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

  658. {

  659.     int i, j;

  660.     int d;

  661.     TM2_INIT_POINTERS_2();

  662. 

  663.     /* update chroma */

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

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

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

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

  668.         }

  669.         U  += Ustride;

  670.         V  += Vstride;

  671.         Uo += oUstride;

  672.         Vo += oVstride;

  673.     }

  674.     U -= Ustride * 2;

  675.     V -= Vstride * 2;

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

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

  678. 

  679.     /* update deltas */

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

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

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

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

  684. 

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

  686.         d = last[3];

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

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

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

  690.         }

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

  692.         Y  += Ystride;

  693.         Yo += oYstride;

  694.     }

  695. }

  696. 

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

  698. {

  699.     int i, j;

  700.     int mx, my;

  701.     TM2_INIT_POINTERS_2();

  702. 

  703.     mx = GET_TOK(ctx, TM2_MOT);

  704.     my = GET_TOK(ctx, TM2_MOT);

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

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

  707. 

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

  709.         av_log(ctx->avctx, AV_LOG_ERROR, "MV out of picture\n");

  710.         return;

  711.     }

  712. 

  713.     Yo += my * oYstride + mx;

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

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

  716. 

  717.     /* copy chroma */

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

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

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

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

  722.         }

  723.         U  += Ustride;

  724.         V  += Vstride;

  725.         Uo += oUstride;

  726.         Vo += oVstride;

  727.     }

  728.     U -= Ustride * 2;

  729.     V -= Vstride * 2;

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

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

  732. 

  733.     /* copy luma */

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

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

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

  737.         }

  738.         Y  += Ystride;

  739.         Yo += oYstride;

  740.     }

  741.     /* calculate deltas */

  742.     Y -= Ystride * 4;

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

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

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

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

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

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

  749. }

  750. 

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

  752. {

  753.     int i, j;

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

  755.     int type;

  756.     int keyframe = 1;

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

  758.     uint8_t *dst;

  759. 

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

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

  762. 

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

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

  765.         return AVERROR_INVALIDDATA;

  766.     }

  767. 

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

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

  770. 

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

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

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

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

  775.             type = GET_TOK(ctx, TM2_TYPE);

  776.             switch(type) {

  777.             case TM2_HI_RES:

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

  779.                 break;

  780.             case TM2_MED_RES:

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

  782.                 break;

  783.             case TM2_LOW_RES:

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

  785.                 break;

  786.             case TM2_NULL_RES:

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

  788.                 break;

  789.             case TM2_UPDATE:

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

  791.                 keyframe = 0;

  792.                 break;

  793.             case TM2_STILL:

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

  795.                 keyframe = 0;

  796.                 break;

  797.             case TM2_MOTION:

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

  799.                 keyframe = 0;

  800.                 break;

  801.             default:

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

  803.             }

  804.         }

  805.     }

  806. 

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

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

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

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

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

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

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

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

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

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

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

  818.         }

  819. 

  820.         /* horizontal edge extension */

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

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

  823. 

  824.         /* vertical edge extension */

  825.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  835.         }

  836. 

  837.         Y += ctx->y_stride;

  838.         if (j & 1) {

  839.             /* horizontal edge extension */

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

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

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

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

  844. 

  845.             /* vertical edge extension */

  846.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  856.             }

  857. 

  858.             U += ctx->uv_stride;

  859.             V += ctx->uv_stride;

  860.         }

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

  862.     }

  863. 

  864.     return keyframe;

  865. }

  866. 

  867. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  869. };

  870. 

  871. #define TM2_HEADER_SIZE 40

  872. 

  873. static int decode_frame(AVCodecContext *avctx,

  874.                         void *data, int *got_frame,

  875.                         AVPacket *avpkt)

  876. {

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

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

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

  880.     AVFrame * const p    = l->pic;

  881.     int offset           = TM2_HEADER_SIZE;

  882.     int i, t, ret;

  883. 

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

  885.     if (!l->buffer) {

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

  887.         return AVERROR(ENOMEM);

  888.     }

  889. 

  890.     if ((ret = ff_reget_buffer(avctx, p)) < 0)

  891.         return ret;

  892. 

  893.     l->bdsp.bswap_buf((uint32_t *) l->buffer, (const uint32_t *) buf,

  894.                       buf_size >> 2);

  895. 

  896.     if ((ret = tm2_read_header(l, l->buffer)) < 0) {

  897.         return ret;

  898.     }

  899. 

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

  901.         if (offset >= buf_size) {

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

  903.             return AVERROR_INVALIDDATA;

  904.         }

  905. 

  906.         t = tm2_read_stream(l, l->buffer + offset, tm2_stream_order[i],

  907.                             buf_size - offset);

  908.         if (t < 0) {

  909.             int j = tm2_stream_order[i];

  910.             memset(l->tokens[j], 0, sizeof(**l->tokens) * l->tok_lens[j]);

  911.             return t;

  912.         }

  913.         offset += t;

  914.     }

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

  916.     if (p->key_frame)

  917.         p->pict_type = AV_PICTURE_TYPE_I;

  918.     else

  919.         p->pict_type = AV_PICTURE_TYPE_P;

  920. 

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

  922.     *got_frame      = 1;

  923.     ret = av_frame_ref(data, l->pic);

  924. 

  925.     return (ret < 0) ? ret : buf_size;

  926. }

  927. 

  928. static av_cold int decode_init(AVCodecContext *avctx)

  929. {

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

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

  932. 

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

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

  935.         return AVERROR(EINVAL);

  936.     }

  937. 

  938.     l->avctx       = avctx;

  939.     avctx->pix_fmt = AV_PIX_FMT_BGR24;

  940. 

  941.     l->pic = av_frame_alloc();

  942.     if (!l->pic)

  943.         return AVERROR(ENOMEM);

  944. 

  945.     ff_bswapdsp_init(&l->bdsp);

  946. 

  947.     l->last  = av_malloc_array(w >> 2, 4 * sizeof(*l->last) );

  948.     l->clast = av_malloc_array(w >> 2, 4 * sizeof(*l->clast));

  949. 

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

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

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

  953.     }

  954. 

  955.     w += 8;

  956.     h += 8;

  957.     l->Y1_base = av_calloc(w * h, sizeof(*l->Y1_base));

  958.     l->Y2_base = av_calloc(w * h, sizeof(*l->Y2_base));

  959.     l->y_stride = w;

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

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

  962.     l->U1_base = av_calloc(w * h, sizeof(*l->U1_base));

  963.     l->V1_base = av_calloc(w * h, sizeof(*l->V1_base));

  964.     l->U2_base = av_calloc(w * h, sizeof(*l->U2_base));

  965.     l->V2_base = av_calloc(w * h, sizeof(*l->V1_base));

  966.     l->uv_stride = w;

  967.     l->cur = 0;

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

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

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

  971.         av_freep(&l->Y1_base);

  972.         av_freep(&l->Y2_base);

  973.         av_freep(&l->U1_base);

  974.         av_freep(&l->U2_base);

  975.         av_freep(&l->V1_base);

  976.         av_freep(&l->V2_base);

  977.         av_freep(&l->last);

  978.         av_freep(&l->clast);

  979.         av_frame_free(&l->pic);

  980.         return AVERROR(ENOMEM);

  981.     }

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

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

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

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

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

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

  988. 

  989.     return 0;

  990. }

  991. 

  992. static av_cold int decode_end(AVCodecContext *avctx)

  993. {

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

  995.     int i;

  996. 

  997.     av_free(l->last);

  998.     av_free(l->clast);

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

  1000.         av_freep(&l->tokens[i]);

  1001.     if (l->Y1) {

  1002.         av_freep(&l->Y1_base);

  1003.         av_freep(&l->U1_base);

  1004.         av_freep(&l->V1_base);

  1005.         av_freep(&l->Y2_base);

  1006.         av_freep(&l->U2_base);

  1007.         av_freep(&l->V2_base);

  1008.     }

  1009.     av_freep(&l->buffer);

  1010.     l->buffer_size = 0;

  1011. 

  1012.     av_frame_free(&l->pic);

  1013. 

  1014.     return 0;

  1015. }

  1016. 

  1017. AVCodec ff_truemotion2_decoder = {

  1018.     .name           = "truemotion2",

  1019.     .long_name      = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),

  1020.     .type           = AVMEDIA_TYPE_VIDEO,

  1021.     .id             = AV_CODEC_ID_TRUEMOTION2,

  1022.     .priv_data_size = sizeof(TM2Context),

  1023.     .init           = decode_init,

  1024.     .close          = decode_end,

  1025.     .decode         = decode_frame,

  1026.     .capabilities   = AV_CODEC_CAP_DR1,

  1027. };