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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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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.     /* TM2 streams */

  69.     int *tokens[TM2_NUM_STREAMS];

  70.     int tok_lens[TM2_NUM_STREAMS];

  71.     int tok_ptrs[TM2_NUM_STREAMS];

  72.     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

  73.     /* for blocks decoding */

  74.     int D[4];

  75.     int CD[4];

  76.     int *last;

  77.     int *clast;

  78. 

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

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

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

  82.     int y_stride, uv_stride;

  83.     int cur;

  84. } TM2Context;

  85. 

  86. /**

  87. * Huffman codes for each of streams

  88. */

  89. typedef struct TM2Codes {

  90.     VLC vlc; ///< table for Libav bitstream reader

  91.     int bits;

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

  93.     int length;

  94. } TM2Codes;

  95. 

  96. /**

  97. * structure for gathering Huffman codes information

  98. */

  99. typedef struct TM2Huff {

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

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

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

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

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

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

  106.     int *nums; ///< literals

  107.     uint32_t *bits; ///< codes

  108.     int *lens; ///< codelengths

  109. } TM2Huff;

  110. 

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

  112. {

  113.     int ret;

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

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

  116.                huff->max_bits);

  117.         return AVERROR_INVALIDDATA;

  118.     }

  119. 

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

  121.         if (length == 0) {

  122.             length = 1;

  123.         }

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

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

  126.             return AVERROR_INVALIDDATA;

  127.         }

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

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

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

  131.         huff->num++;

  132.         return 0;

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

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

  135.             return ret;

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

  137.             return ret;

  138.     }

  139.     return 0;

  140. }

  141. 

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

  143. {

  144.     TM2Huff huff;

  145.     int res = 0;

  146. 

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

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

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

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

  151.     huff.num      = 0;

  152. 

  153.     /* check for correct codes parameters */

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

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

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

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

  158.         return AVERROR_INVALIDDATA;

  159.     }

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

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

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

  163.         return AVERROR_INVALIDDATA;

  164.     }

  165.     /* one-node tree */

  166.     if (huff.max_bits == 0)

  167.         huff.max_bits = 1;

  168. 

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

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

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

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

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

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

  175.         res = AVERROR(ENOMEM);

  176.         goto out;

  177.     }

  178. 

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

  180. 

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

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

  183.                huff.num, huff.max_num);

  184.         res = AVERROR_INVALIDDATA;

  185.     }

  186. 

  187.     /* convert codes to vlc_table */

  188.     if (res >= 0) {

  189.         int i;

  190. 

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

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

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

  194.         if (res < 0)

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

  196.         else {

  197.             code->bits = huff.max_bits;

  198.             code->length = huff.max_num;

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

  200.             if (!code->recode) {

  201.                 res = AVERROR(ENOMEM);

  202.                 goto out;

  203.             }

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

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

  206.         }

  207.     }

  208. 

  209. out:

  210.     /* free allocated memory */

  211.     av_free(huff.nums);

  212.     av_free(huff.bits);

  213.     av_free(huff.lens);

  214. 

  215.     return res;

  216. }

  217. 

  218. static void tm2_free_codes(TM2Codes *code)

  219. {

  220.     av_free(code->recode);

  221.     if (code->vlc.table)

  222.         ff_free_vlc(&code->vlc);

  223. }

  224. 

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

  226. {

  227.     int val;

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

  229.     return code->recode[val];

  230. }

  231. 

  232. #define TM2_OLD_HEADER_MAGIC 0x00000100

  233. #define TM2_NEW_HEADER_MAGIC 0x00000101

  234. 

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

  236. {

  237.     uint32_t magic = AV_RL32(buf);

  238. 

  239.     switch (magic) {

  240.     case TM2_OLD_HEADER_MAGIC:

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

  242.         return 0;

  243.     case TM2_NEW_HEADER_MAGIC:

  244.         return 0;

  245.     default:

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

  247.                magic);

  248.         return AVERROR_INVALIDDATA;

  249.     }

  250. }

  251. 

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

  253. {

  254.     int d, mb;

  255.     int i, v;

  256. 

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

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

  259. 

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

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

  262.         return AVERROR_INVALIDDATA;

  263.     }

  264. 

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

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

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

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

  269.         else

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

  271.     }

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

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

  274. 

  275.     return 0;

  276. }

  277. 

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

  279. {

  280.     int i, ret;

  281.     int skip = 0;

  282.     int len, toks, pos;

  283.     TM2Codes codes;

  284.     GetByteContext gb;

  285. 

  286.     /* get stream length in dwords */

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

  288.     len  = bytestream2_get_be32(&gb);

  289.     skip = len * 4 + 4;

  290. 

  291.     if (len == 0)

  292.         return 4;

  293. 

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

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

  296.         return AVERROR_INVALIDDATA;

  297.     }

  298. 

  299.     toks = bytestream2_get_be32(&gb);

  300.     if (toks & 1) {

  301.         len = bytestream2_get_be32(&gb);

  302.         if (len == TM2_ESCAPE) {

  303.             len = bytestream2_get_be32(&gb);

  304.         }

  305.         if (len > 0) {

  306.             pos = bytestream2_tell(&gb);

  307.             if (skip <= pos)

  308.                 return AVERROR_INVALIDDATA;

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

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

  311.                 return ret;

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

  313.         }

  314.     }

  315.     /* skip unused fields */

  316.     len = bytestream2_get_be32(&gb);

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

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

  319.     } else {

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

  321.     }

  322. 

  323.     pos = bytestream2_tell(&gb);

  324.     if (skip <= pos)

  325.         return AVERROR_INVALIDDATA;

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

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

  328.         return ret;

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

  330. 

  331.     toks >>= 1;

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

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

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

  335.         tm2_free_codes(&codes);

  336.         return AVERROR_INVALIDDATA;

  337.     }

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

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

  340.     len = bytestream2_get_be32(&gb);

  341.     if (len > 0) {

  342.         pos = bytestream2_tell(&gb);

  343.         if (skip <= pos)

  344.             return AVERROR_INVALIDDATA;

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

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

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

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

  349.                 return AVERROR_INVALIDDATA;

  350.             }

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

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

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

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

  355.                 return AVERROR_INVALIDDATA;

  356.             }

  357.         }

  358.     } else {

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

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

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

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

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

  364.                 return AVERROR_INVALIDDATA;

  365.             }

  366.         }

  367.     }

  368.     tm2_free_codes(&codes);

  369. 

  370.     return skip;

  371. }

  372. 

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

  374. {

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

  376.         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]);

  377.         return 0;

  378.     }

  379.     if (type <= TM2_MOT)

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

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

  382. }

  383. 

  384. /* blocks decoding routines */

  385. 

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

  387. #define TM2_INIT_POINTERS() \

  388.     int *last, *clast; \

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

  390.     int Ystride, Ustride, Vstride;\

  391. \

  392.     Ystride = ctx->y_stride;\

  393.     Vstride = ctx->uv_stride;\

  394.     Ustride = ctx->uv_stride;\

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

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

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

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

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

  400. 

  401. #define TM2_INIT_POINTERS_2() \

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

  403.     int oYstride, oUstride, oVstride;\

  404. \

  405.     TM2_INIT_POINTERS();\

  406.     oYstride = Ystride;\

  407.     oVstride = Vstride;\

  408.     oUstride = Ustride;\

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

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

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

  412. 

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

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

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

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

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

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

  419. 

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

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

  422. {

  423.     int ct, d;

  424.     int i, j;

  425. 

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

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

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

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

  430.             ct      += d;

  431.             last[i] += ct;

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

  433.         }

  434.         Y        += stride;

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

  436.     }

  437. }

  438. 

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

  440. {

  441.     int i, j;

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

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

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

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

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

  447.         }

  448.         data += stride;

  449.     }

  450. }

  451. 

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

  453. {

  454.     int t;

  455.     int l;

  456.     int prev;

  457. 

  458.     if (bx > 0)

  459.         prev = clast[-3];

  460.     else

  461.         prev = 0;

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

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

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

  465.     CD[0]    = t;

  466.     clast[0] = l;

  467. 

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

  469. }

  470. 

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

  472. {

  473.     int i;

  474.     int deltas[16];

  475.     TM2_INIT_POINTERS();

  476. 

  477.     /* hi-res chroma */

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

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

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

  481.     }

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

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

  484. 

  485.     /* hi-res luma */

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

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

  488. 

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

  490. }

  491. 

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

  493. {

  494.     int i;

  495.     int deltas[16];

  496.     TM2_INIT_POINTERS();

  497. 

  498.     /* low-res chroma */

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

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

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

  502. 

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

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

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

  506. 

  507.     /* hi-res luma */

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

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

  510. 

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

  512. }

  513. 

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

  515. {

  516.     int i;

  517.     int t1, t2;

  518.     int deltas[16];

  519.     TM2_INIT_POINTERS();

  520. 

  521.     /* low-res chroma */

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

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

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

  525. 

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

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

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

  529. 

  530.     /* low-res luma */

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

  532.         deltas[i] = 0;

  533. 

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

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

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

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

  538. 

  539.     if (bx > 0)

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

  541.     else

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

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

  544. 

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

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

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

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

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

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

  551. 

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

  553. }

  554. 

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

  556. {

  557.     int i;

  558.     int ct;

  559.     int left, right, diff;

  560.     int deltas[16];

  561.     TM2_INIT_POINTERS();

  562. 

  563.     /* null chroma */

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

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

  566. 

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

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

  569. 

  570.     /* null luma */

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

  572.         deltas[i] = 0;

  573. 

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

  575. 

  576.     if (bx > 0)

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

  578.     else

  579.         left = 0;

  580. 

  581.     right   = last[3];

  582.     diff    = right - left;

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

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

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

  586.     last[3] = right;

  587.     {

  588.         int tp = left;

  589. 

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

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

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

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

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

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

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

  597.     }

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

  599. }

  600. 

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

  602. {

  603.     int i, j;

  604.     TM2_INIT_POINTERS_2();

  605. 

  606.     /* update chroma */

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

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

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

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

  611.         }

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

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

  614.     }

  615.     U -= Ustride * 2;

  616.     V -= Vstride * 2;

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

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

  619. 

  620.     /* update deltas */

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

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

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

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

  625. 

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

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

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

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

  630.         }

  631.         Y  += Ystride;

  632.         Yo += oYstride;

  633.     }

  634. }

  635. 

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

  637. {

  638.     int i, j;

  639.     int d;

  640.     TM2_INIT_POINTERS_2();

  641. 

  642.     /* update chroma */

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

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

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

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

  647.         }

  648.         U  += Ustride;

  649.         V  += Vstride;

  650.         Uo += oUstride;

  651.         Vo += oVstride;

  652.     }

  653.     U -= Ustride * 2;

  654.     V -= Vstride * 2;

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

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

  657. 

  658.     /* update deltas */

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

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

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

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

  663. 

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

  665.         d = last[3];

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

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

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

  669.         }

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

  671.         Y  += Ystride;

  672.         Yo += oYstride;

  673.     }

  674. }

  675. 

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

  677. {

  678.     int i, j;

  679.     int mx, my;

  680.     TM2_INIT_POINTERS_2();

  681. 

  682.     mx = GET_TOK(ctx, TM2_MOT);

  683.     my = GET_TOK(ctx, TM2_MOT);

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

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

  686. 

  687.     Yo += my * oYstride + mx;

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

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

  690. 

  691.     /* copy chroma */

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

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

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

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

  696.         }

  697.         U  += Ustride;

  698.         V  += Vstride;

  699.         Uo += oUstride;

  700.         Vo += oVstride;

  701.     }

  702.     U -= Ustride * 2;

  703.     V -= Vstride * 2;

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

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

  706. 

  707.     /* copy luma */

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

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

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

  711.         }

  712.         Y  += Ystride;

  713.         Yo += oYstride;

  714.     }

  715.     /* calculate deltas */

  716.     Y -= Ystride * 4;

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

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

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

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

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

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

  723. }

  724. 

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

  726. {

  727.     int i, j;

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

  729.     int type;

  730.     int keyframe = 1;

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

  732.     uint8_t *dst;

  733. 

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

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

  736. 

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

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

  739.         return AVERROR_INVALIDDATA;

  740.     }

  741. 

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

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

  744. 

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

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

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

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

  749.             type = GET_TOK(ctx, TM2_TYPE);

  750.             switch(type) {

  751.             case TM2_HI_RES:

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

  753.                 break;

  754.             case TM2_MED_RES:

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

  756.                 break;

  757.             case TM2_LOW_RES:

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

  759.                 break;

  760.             case TM2_NULL_RES:

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

  762.                 break;

  763.             case TM2_UPDATE:

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

  765.                 keyframe = 0;

  766.                 break;

  767.             case TM2_STILL:

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

  769.                 keyframe = 0;

  770.                 break;

  771.             case TM2_MOTION:

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

  773.                 keyframe = 0;

  774.                 break;

  775.             default:

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

  777.             }

  778.         }

  779.     }

  780. 

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

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

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

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

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

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

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

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

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

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

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

  792.         }

  793. 

  794.         /* horizontal edge extension */

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

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

  797. 

  798.         /* vertical edge extension */

  799.         if (j == 0) {

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

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

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

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

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

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

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

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

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

  809.         }

  810. 

  811.         Y += ctx->y_stride;

  812.         if (j & 1) {

  813.             /* horizontal edge extension */

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

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

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

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

  818. 

  819.             /* vertical edge extension */

  820.             if (j == 1) {

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

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

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

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

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

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

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

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

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

  830.             }

  831. 

  832.             U += ctx->uv_stride;

  833.             V += ctx->uv_stride;

  834.         }

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

  836.     }

  837. 

  838.     return keyframe;

  839. }

  840. 

  841. static const int tm2_stream_order[TM2_NUM_STREAMS] = {

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

  843. };

  844. 

  845. #define TM2_HEADER_SIZE 40

  846. 

  847. static int decode_frame(AVCodecContext *avctx,

  848.                         void *data, int *got_frame,

  849.                         AVPacket *avpkt)

  850. {

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

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

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

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

  855.     int offset           = TM2_HEADER_SIZE;

  856.     int i, t, ret;

  857.     uint8_t *swbuf;

  858. 

  859.     swbuf = av_malloc(buf_size + AV_INPUT_BUFFER_PADDING_SIZE);

  860.     if (!swbuf) {

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

  862.         return AVERROR(ENOMEM);

  863.     }

  864. 

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

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

  867.         av_free(swbuf);

  868.         return ret;

  869.     }

  870. 

  871.     l->bdsp.bswap_buf((uint32_t *) swbuf, (const uint32_t *) buf,

  872.                       buf_size >> 2);

  873. 

  874.     if ((ret = tm2_read_header(l, swbuf)) < 0) {

  875.         av_free(swbuf);

  876.         return ret;

  877.     }

  878. 

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

  880.         if (offset >= buf_size) {

  881.             av_free(swbuf);

  882.             return AVERROR_INVALIDDATA;

  883.         }

  884.         t = tm2_read_stream(l, swbuf + offset, tm2_stream_order[i],

  885.                             buf_size - offset);

  886.         if (t < 0) {

  887.             av_free(swbuf);

  888.             return t;

  889.         }

  890.         offset += t;

  891.     }

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

  893.     if (p->key_frame)

  894.         p->pict_type = AV_PICTURE_TYPE_I;

  895.     else

  896.         p->pict_type = AV_PICTURE_TYPE_P;

  897. 

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

  899.     *got_frame      = 1;

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

  901.     av_free(swbuf);

  902. 

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

  904. }

  905. 

  906. static av_cold int decode_init(AVCodecContext *avctx)

  907. {

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

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

  910. 

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

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

  913.         return AVERROR(EINVAL);

  914.     }

  915. 

  916.     l->avctx       = avctx;

  917.     avctx->pix_fmt = AV_PIX_FMT_BGR24;

  918. 

  919.     l->pic = av_frame_alloc();

  920.     if (!l->pic)

  921.         return AVERROR(ENOMEM);

  922. 

  923.     ff_bswapdsp_init(&l->bdsp);

  924. 

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

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

  927. 

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

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

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

  931.     }

  932. 

  933.     w += 8;

  934.     h += 8;

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

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

  937.     l->y_stride = w;

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

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

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

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

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

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

  944.     l->uv_stride = w;

  945.     l->cur = 0;

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

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

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

  949.         av_freep(&l->Y1_base);

  950.         av_freep(&l->Y2_base);

  951.         av_freep(&l->U1_base);

  952.         av_freep(&l->U2_base);

  953.         av_freep(&l->V1_base);

  954.         av_freep(&l->V2_base);

  955.         av_freep(&l->last);

  956.         av_freep(&l->clast);

  957.         return AVERROR(ENOMEM);

  958.     }

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

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

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

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

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

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

  965. 

  966.     return 0;

  967. }

  968. 

  969. static av_cold int decode_end(AVCodecContext *avctx)

  970. {

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

  972.     int i;

  973. 

  974.     av_free(l->last);

  975.     av_free(l->clast);

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

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

  978.     if (l->Y1) {

  979.         av_free(l->Y1_base);

  980.         av_free(l->U1_base);

  981.         av_free(l->V1_base);

  982.         av_free(l->Y2_base);

  983.         av_free(l->U2_base);

  984.         av_free(l->V2_base);

  985.     }

  986. 

  987.     av_frame_free(&l->pic);

  988. 

  989.     return 0;

  990. }

  991. 

  992. AVCodec ff_truemotion2_decoder = {

  993.     .name           = "truemotion2",

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

  995.     .type           = AVMEDIA_TYPE_VIDEO,

  996.     .id             = AV_CODEC_ID_TRUEMOTION2,

  997.     .priv_data_size = sizeof(TM2Context),

  998.     .init           = decode_init,

  999.     .close          = decode_end,

  1000.     .decode         = decode_frame,

  1001.     .capabilities   = AV_CODEC_CAP_DR1,

  1002. };