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FFmpeg/libavcodec/smacker.c

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  1. /*

  2.  * Smacker decoder

  3.  * Copyright (c) 2006 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.  * Smacker decoder

  25.  */

  26. 

  27. /*

  28.  * Based on http://wiki.multimedia.cx/index.php?title=Smacker

  29.  */

  30. 

  31. #include <stdio.h>

  32. #include <stdlib.h>

  33. 

  34. #include "libavutil/channel_layout.h"

  35. 

  36. #define BITSTREAM_READER_LE

  37. #include "avcodec.h"

  38. #include "bytestream.h"

  39. #include "get_bits.h"

  40. #include "internal.h"

  41. #include "mathops.h"

  42. 

  43. #define SMKTREE_BITS 9

  44. #define SMK_NODE 0x80000000

  45. 

  46. #define SMKTREE_DECODE_MAX_RECURSION 32

  47. #define SMKTREE_DECODE_BIG_MAX_RECURSION 500

  48. 

  49. typedef struct SmackVContext {

  50.     AVCodecContext *avctx;

  51.     AVFrame *pic;

  52. 

  53.     int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;

  54.     int mmap_last[3], mclr_last[3], full_last[3], type_last[3];

  55. } SmackVContext;

  56. 

  57. /**

  58.  * Context used for code reconstructing

  59.  */

  60. typedef struct HuffContext {

  61.     int length;

  62.     int maxlength;

  63.     int current;

  64.     uint32_t *bits;

  65.     int *lengths;

  66.     int *values;

  67. } HuffContext;

  68. 

  69. /* common parameters used for decode_bigtree */

  70. typedef struct DBCtx {

  71.     VLC *v1, *v2;

  72.     int *recode1, *recode2;

  73.     int escapes[3];

  74.     int *last;

  75.     int lcur;

  76. } DBCtx;

  77. 

  78. /* possible runs of blocks */

  79. static const int block_runs[64] = {

  80.       1,    2,    3,    4,    5,    6,    7,    8,

  81.       9,   10,   11,   12,   13,   14,   15,   16,

  82.      17,   18,   19,   20,   21,   22,   23,   24,

  83.      25,   26,   27,   28,   29,   30,   31,   32,

  84.      33,   34,   35,   36,   37,   38,   39,   40,

  85.      41,   42,   43,   44,   45,   46,   47,   48,

  86.      49,   50,   51,   52,   53,   54,   55,   56,

  87.      57,   58,   59,  128,  256,  512, 1024, 2048 };

  88. 

  89. enum SmkBlockTypes {

  90.     SMK_BLK_MONO = 0,

  91.     SMK_BLK_FULL = 1,

  92.     SMK_BLK_SKIP = 2,

  93.     SMK_BLK_FILL = 3 };

  94. 

  95. /**

  96.  * Decode local frame tree

  97.  */

  98. static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)

  99. {

  100.     if (length > SMKTREE_DECODE_MAX_RECURSION || length > 3 * SMKTREE_BITS) {

  101.         av_log(NULL, AV_LOG_ERROR, "Maximum tree recursion level exceeded.\n");

  102.         return AVERROR_INVALIDDATA;

  103.     }

  104. 

  105.     if(!get_bits1(gb)){ //Leaf

  106.         if(hc->current >= hc->length){

  107.             av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");

  108.             return AVERROR_INVALIDDATA;

  109.         }

  110.         if(length){

  111.             hc->bits[hc->current] = prefix;

  112.             hc->lengths[hc->current] = length;

  113.         } else {

  114.             hc->bits[hc->current] = 0;

  115.             hc->lengths[hc->current] = 0;

  116.         }

  117.         hc->values[hc->current] = get_bits(gb, 8);

  118.         hc->current++;

  119.         if(hc->maxlength < length)

  120.             hc->maxlength = length;

  121.         return 0;

  122.     } else { //Node

  123.         int r;

  124.         length++;

  125.         r = smacker_decode_tree(gb, hc, prefix, length);

  126.         if(r)

  127.             return r;

  128.         return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length);

  129.     }

  130. }

  131. 

  132. /**

  133.  * Decode header tree

  134.  */

  135. static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc,

  136.                                   DBCtx *ctx, int length)

  137. {

  138.     // Larger length can cause segmentation faults due to too deep recursion.

  139.     if (length > SMKTREE_DECODE_BIG_MAX_RECURSION) {

  140.         av_log(NULL, AV_LOG_ERROR, "Maximum bigtree recursion level exceeded.\n");

  141.         return AVERROR_INVALIDDATA;

  142.     }

  143. 

  144.     if (hc->current + 1 >= hc->length) {

  145.         av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");

  146.         return AVERROR_INVALIDDATA;

  147.     }

  148.     if(!get_bits1(gb)){ //Leaf

  149.         int val, i1, i2;

  150.         i1 = ctx->v1->table ? get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3) : 0;

  151.         i2 = ctx->v2->table ? get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3) : 0;

  152.         if (i1 < 0 || i2 < 0)

  153.             return AVERROR_INVALIDDATA;

  154.         val = ctx->recode1[i1] | (ctx->recode2[i2] << 8);

  155.         if(val == ctx->escapes[0]) {

  156.             ctx->last[0] = hc->current;

  157.             val = 0;

  158.         } else if(val == ctx->escapes[1]) {

  159.             ctx->last[1] = hc->current;

  160.             val = 0;

  161.         } else if(val == ctx->escapes[2]) {

  162.             ctx->last[2] = hc->current;

  163.             val = 0;

  164.         }

  165. 

  166.         hc->values[hc->current++] = val;

  167.         return 1;

  168.     } else { //Node

  169.         int r = 0, r_new, t;

  170. 

  171.         t = hc->current++;

  172.         r = smacker_decode_bigtree(gb, hc, ctx, length + 1);

  173.         if(r < 0)

  174.             return r;

  175.         hc->values[t] = SMK_NODE | r;

  176.         r++;

  177.         r_new = smacker_decode_bigtree(gb, hc, ctx, length + 1);

  178.         if (r_new < 0)

  179.             return r_new;

  180.         return r + r_new;

  181.     }

  182. }

  183. 

  184. /**

  185.  * Store large tree as FFmpeg's vlc codes

  186.  */

  187. static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)

  188. {

  189.     int res;

  190.     HuffContext huff;

  191.     HuffContext tmp1, tmp2;

  192.     VLC vlc[2] = { { 0 } };

  193.     int escapes[3];

  194.     DBCtx ctx;

  195.     int err = 0;

  196. 

  197.     if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow

  198.         av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");

  199.         return AVERROR_INVALIDDATA;

  200.     }

  201. 

  202.     tmp1.length = 256;

  203.     tmp1.maxlength = 0;

  204.     tmp1.current = 0;

  205.     tmp1.bits = av_mallocz(256 * 4);

  206.     tmp1.lengths = av_mallocz(256 * sizeof(int));

  207.     tmp1.values = av_mallocz(256 * sizeof(int));

  208. 

  209.     tmp2.length = 256;

  210.     tmp2.maxlength = 0;

  211.     tmp2.current = 0;

  212.     tmp2.bits = av_mallocz(256 * 4);

  213.     tmp2.lengths = av_mallocz(256 * sizeof(int));

  214.     tmp2.values = av_mallocz(256 * sizeof(int));

  215.     if (!tmp1.bits || !tmp1.lengths || !tmp1.values ||

  216.         !tmp2.bits || !tmp2.lengths || !tmp2.values) {

  217.         err = AVERROR(ENOMEM);

  218.         goto error;

  219.     }

  220. 

  221.     if(get_bits1(gb)) {

  222.         res = smacker_decode_tree(gb, &tmp1, 0, 0);

  223.         if (res < 0) {

  224.             err = res;

  225.             goto error;

  226.         }

  227.         skip_bits1(gb);

  228.         if(tmp1.current > 1) {

  229.             res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length,

  230.                         tmp1.lengths, sizeof(int), sizeof(int),

  231.                         tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);

  232.             if(res < 0) {

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

  234.                 err = res;

  235.                 goto error;

  236.             }

  237.         }

  238.     }

  239.     if (!vlc[0].table) {

  240.         av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n");

  241.     }

  242.     if(get_bits1(gb)){

  243.         res = smacker_decode_tree(gb, &tmp2, 0, 0);

  244.         if (res < 0) {

  245.             err = res;

  246.             goto error;

  247.         }

  248.         skip_bits1(gb);

  249.         if(tmp2.current > 1) {

  250.             res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length,

  251.                         tmp2.lengths, sizeof(int), sizeof(int),

  252.                         tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);

  253.             if(res < 0) {

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

  255.                 err = res;

  256.                 goto error;

  257.             }

  258.         }

  259.     }

  260.     if (!vlc[1].table) {

  261.         av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n");

  262.     }

  263. 

  264.     escapes[0]  = get_bits(gb, 16);

  265.     escapes[1]  = get_bits(gb, 16);

  266.     escapes[2]  = get_bits(gb, 16);

  267. 

  268.     last[0] = last[1] = last[2] = -1;

  269. 

  270.     ctx.escapes[0] = escapes[0];

  271.     ctx.escapes[1] = escapes[1];

  272.     ctx.escapes[2] = escapes[2];

  273.     ctx.v1 = &vlc[0];

  274.     ctx.v2 = &vlc[1];

  275.     ctx.recode1 = tmp1.values;

  276.     ctx.recode2 = tmp2.values;

  277.     ctx.last = last;

  278. 

  279.     huff.length = ((size + 3) >> 2) + 4;

  280.     huff.maxlength = 0;

  281.     huff.current = 0;

  282.     huff.values = av_mallocz_array(huff.length, sizeof(int));

  283.     if (!huff.values) {

  284.         err = AVERROR(ENOMEM);

  285.         goto error;

  286.     }

  287. 

  288.     res = smacker_decode_bigtree(gb, &huff, &ctx, 0);

  289.     if (res < 0)

  290.         err = res;

  291.     skip_bits1(gb);

  292.     if(ctx.last[0] == -1) ctx.last[0] = huff.current++;

  293.     if(ctx.last[1] == -1) ctx.last[1] = huff.current++;

  294.     if(ctx.last[2] == -1) ctx.last[2] = huff.current++;

  295.     if (ctx.last[0] >= huff.length ||

  296.         ctx.last[1] >= huff.length ||

  297.         ctx.last[2] >= huff.length) {

  298.         av_log(smk->avctx, AV_LOG_ERROR, "Huffman codes out of range\n");

  299.         err = AVERROR_INVALIDDATA;

  300.     }

  301. 

  302.     *recodes = huff.values;

  303. 

  304. error:

  305.     if(vlc[0].table)

  306.         ff_free_vlc(&vlc[0]);

  307.     if(vlc[1].table)

  308.         ff_free_vlc(&vlc[1]);

  309.     av_free(tmp1.bits);

  310.     av_free(tmp1.lengths);

  311.     av_free(tmp1.values);

  312.     av_free(tmp2.bits);

  313.     av_free(tmp2.lengths);

  314.     av_free(tmp2.values);

  315. 

  316.     return err;

  317. }

  318. 

  319. static int decode_header_trees(SmackVContext *smk) {

  320.     GetBitContext gb;

  321.     int mmap_size, mclr_size, full_size, type_size, ret;

  322. 

  323.     mmap_size = AV_RL32(smk->avctx->extradata);

  324.     mclr_size = AV_RL32(smk->avctx->extradata + 4);

  325.     full_size = AV_RL32(smk->avctx->extradata + 8);

  326.     type_size = AV_RL32(smk->avctx->extradata + 12);

  327. 

  328.     ret = init_get_bits8(&gb, smk->avctx->extradata + 16, smk->avctx->extradata_size - 16);

  329.     if (ret < 0)

  330.         return ret;

  331. 

  332.     if(!get_bits1(&gb)) {

  333.         av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");

  334.         smk->mmap_tbl = av_malloc(sizeof(int) * 2);

  335.         if (!smk->mmap_tbl)

  336.             return AVERROR(ENOMEM);

  337.         smk->mmap_tbl[0] = 0;

  338.         smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;

  339.     } else {

  340.         ret = smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size);

  341.         if (ret < 0)

  342.             return ret;

  343.     }

  344.     if(!get_bits1(&gb)) {

  345.         av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");

  346.         smk->mclr_tbl = av_malloc(sizeof(int) * 2);

  347.         if (!smk->mclr_tbl)

  348.             return AVERROR(ENOMEM);

  349.         smk->mclr_tbl[0] = 0;

  350.         smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;

  351.     } else {

  352.         ret = smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size);

  353.         if (ret < 0)

  354.             return ret;

  355.     }

  356.     if(!get_bits1(&gb)) {

  357.         av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");

  358.         smk->full_tbl = av_malloc(sizeof(int) * 2);

  359.         if (!smk->full_tbl)

  360.             return AVERROR(ENOMEM);

  361.         smk->full_tbl[0] = 0;

  362.         smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;

  363.     } else {

  364.         ret = smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size);

  365.         if (ret < 0)

  366.             return ret;

  367.     }

  368.     if(!get_bits1(&gb)) {

  369.         av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");

  370.         smk->type_tbl = av_malloc(sizeof(int) * 2);

  371.         if (!smk->type_tbl)

  372.             return AVERROR(ENOMEM);

  373.         smk->type_tbl[0] = 0;

  374.         smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;

  375.     } else {

  376.         ret = smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size);

  377.         if (ret < 0)

  378.             return ret;

  379.     }

  380. 

  381.     return 0;

  382. }

  383. 

  384. static av_always_inline void last_reset(int *recode, int *last) {

  385.     recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;

  386. }

  387. 

  388. /* get code and update history */

  389. static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {

  390.     register int *table = recode;

  391.     int v;

  392. 

  393.     while(*table & SMK_NODE) {

  394.         if(get_bits1(gb))

  395.             table += (*table) & (~SMK_NODE);

  396.         table++;

  397.     }

  398.     v = *table;

  399. 

  400.     if(v != recode[last[0]]) {

  401.         recode[last[2]] = recode[last[1]];

  402.         recode[last[1]] = recode[last[0]];

  403.         recode[last[0]] = v;

  404.     }

  405.     return v;

  406. }

  407. 

  408. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  409.                         AVPacket *avpkt)

  410. {

  411.     SmackVContext * const smk = avctx->priv_data;

  412.     uint8_t *out;

  413.     uint32_t *pal;

  414.     GetByteContext gb2;

  415.     GetBitContext gb;

  416.     int blocks, blk, bw, bh;

  417.     int i, ret;

  418.     int stride;

  419.     int flags;

  420. 

  421.     if (avpkt->size <= 769)

  422.         return AVERROR_INVALIDDATA;

  423. 

  424.     if ((ret = ff_reget_buffer(avctx, smk->pic)) < 0)

  425.         return ret;

  426. 

  427.     /* make the palette available on the way out */

  428.     pal = (uint32_t*)smk->pic->data[1];

  429.     bytestream2_init(&gb2, avpkt->data, avpkt->size);

  430.     flags = bytestream2_get_byteu(&gb2);

  431.     smk->pic->palette_has_changed = flags & 1;

  432.     smk->pic->key_frame = !!(flags & 2);

  433.     if (smk->pic->key_frame)

  434.         smk->pic->pict_type = AV_PICTURE_TYPE_I;

  435.     else

  436.         smk->pic->pict_type = AV_PICTURE_TYPE_P;

  437. 

  438.     for(i = 0; i < 256; i++)

  439.         *pal++ = 0xFFU << 24 | bytestream2_get_be24u(&gb2);

  440. 

  441.     last_reset(smk->mmap_tbl, smk->mmap_last);

  442.     last_reset(smk->mclr_tbl, smk->mclr_last);

  443.     last_reset(smk->full_tbl, smk->full_last);

  444.     last_reset(smk->type_tbl, smk->type_last);

  445.     if ((ret = init_get_bits8(&gb, avpkt->data + 769, avpkt->size - 769)) < 0)

  446.         return ret;

  447. 

  448.     blk = 0;

  449.     bw = avctx->width >> 2;

  450.     bh = avctx->height >> 2;

  451.     blocks = bw * bh;

  452.     stride = smk->pic->linesize[0];

  453.     while(blk < blocks) {

  454.         int type, run, mode;

  455.         uint16_t pix;

  456. 

  457.         type = smk_get_code(&gb, smk->type_tbl, smk->type_last);

  458.         run = block_runs[(type >> 2) & 0x3F];

  459.         switch(type & 3){

  460.         case SMK_BLK_MONO:

  461.             while(run-- && blk < blocks){

  462.                 int clr, map;

  463.                 int hi, lo;

  464.                 clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);

  465.                 map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);

  466.                 out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;

  467.                 hi = clr >> 8;

  468.                 lo = clr & 0xFF;

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

  470.                     if(map & 1) out[0] = hi; else out[0] = lo;

  471.                     if(map & 2) out[1] = hi; else out[1] = lo;

  472.                     if(map & 4) out[2] = hi; else out[2] = lo;

  473.                     if(map & 8) out[3] = hi; else out[3] = lo;

  474.                     map >>= 4;

  475.                     out += stride;

  476.                 }

  477.                 blk++;

  478.             }

  479.             break;

  480.         case SMK_BLK_FULL:

  481.             mode = 0;

  482.             if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes

  483.                 if(get_bits1(&gb)) mode = 1;

  484.                 else if(get_bits1(&gb)) mode = 2;

  485.             }

  486.             while(run-- && blk < blocks){

  487.                 out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;

  488.                 switch(mode){

  489.                 case 0:

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

  491.                         pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);

  492.                         AV_WL16(out+2,pix);

  493.                         pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);

  494.                         AV_WL16(out,pix);

  495.                         out += stride;

  496.                     }

  497.                     break;

  498.                 case 1:

  499.                     pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);

  500.                     out[0] = out[1] = pix & 0xFF;

  501.                     out[2] = out[3] = pix >> 8;

  502.                     out += stride;

  503.                     out[0] = out[1] = pix & 0xFF;

  504.                     out[2] = out[3] = pix >> 8;

  505.                     out += stride;

  506.                     pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);

  507.                     out[0] = out[1] = pix & 0xFF;

  508.                     out[2] = out[3] = pix >> 8;

  509.                     out += stride;

  510.                     out[0] = out[1] = pix & 0xFF;

  511.                     out[2] = out[3] = pix >> 8;

  512.                     break;

  513.                 case 2:

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

  515.                         uint16_t pix1, pix2;

  516.                         pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);

  517.                         pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);

  518.                         AV_WL16(out,pix1);

  519.                         AV_WL16(out+2,pix2);

  520.                         out += stride;

  521.                         AV_WL16(out,pix1);

  522.                         AV_WL16(out+2,pix2);

  523.                         out += stride;

  524.                     }

  525.                     break;

  526.                 }

  527.                 blk++;

  528.             }

  529.             break;

  530.         case SMK_BLK_SKIP:

  531.             while(run-- && blk < blocks)

  532.                 blk++;

  533.             break;

  534.         case SMK_BLK_FILL:

  535.             mode = type >> 8;

  536.             while(run-- && blk < blocks){

  537.                 uint32_t col;

  538.                 out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;

  539.                 col = mode * 0x01010101U;

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

  541.                     *((uint32_t*)out) = col;

  542.                     out += stride;

  543.                 }

  544.                 blk++;

  545.             }

  546.             break;

  547.         }

  548. 

  549.     }

  550. 

  551.     if ((ret = av_frame_ref(data, smk->pic)) < 0)

  552.         return ret;

  553. 

  554.     *got_frame = 1;

  555. 

  556.     /* always report that the buffer was completely consumed */

  557.     return avpkt->size;

  558. }

  559. 

  560. 

  561. static av_cold int decode_end(AVCodecContext *avctx)

  562. {

  563.     SmackVContext * const smk = avctx->priv_data;

  564. 

  565.     av_freep(&smk->mmap_tbl);

  566.     av_freep(&smk->mclr_tbl);

  567.     av_freep(&smk->full_tbl);

  568.     av_freep(&smk->type_tbl);

  569. 

  570.     av_frame_free(&smk->pic);

  571. 

  572.     return 0;

  573. }

  574. 

  575. 

  576. static av_cold int decode_init(AVCodecContext *avctx)

  577. {

  578.     SmackVContext * const c = avctx->priv_data;

  579.     int ret;

  580. 

  581.     c->avctx = avctx;

  582. 

  583.     avctx->pix_fmt = AV_PIX_FMT_PAL8;

  584. 

  585.     c->pic = av_frame_alloc();

  586.     if (!c->pic)

  587.         return AVERROR(ENOMEM);

  588. 

  589.     /* decode huffman trees from extradata */

  590.     if(avctx->extradata_size < 16){

  591.         av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");

  592.         decode_end(avctx);

  593.         return AVERROR(EINVAL);

  594.     }

  595. 

  596.     ret = decode_header_trees(c);

  597.     if (ret < 0) {

  598.         decode_end(avctx);

  599.         return ret;

  600.     }

  601. 

  602.     return 0;

  603. }

  604. 

  605. 

  606. static av_cold int smka_decode_init(AVCodecContext *avctx)

  607. {

  608.     if (avctx->channels < 1 || avctx->channels > 2) {

  609.         av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");

  610.         return AVERROR_INVALIDDATA;

  611.     }

  612.     avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;

  613.     avctx->sample_fmt = avctx->bits_per_coded_sample == 8 ? AV_SAMPLE_FMT_U8 : AV_SAMPLE_FMT_S16;

  614. 

  615.     return 0;

  616. }

  617. 

  618. /**

  619.  * Decode Smacker audio data

  620.  */

  621. static int smka_decode_frame(AVCodecContext *avctx, void *data,

  622.                              int *got_frame_ptr, AVPacket *avpkt)

  623. {

  624.     AVFrame *frame     = data;

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

  626.     int buf_size = avpkt->size;

  627.     GetBitContext gb;

  628.     HuffContext h[4] = { { 0 } };

  629.     VLC vlc[4]       = { { 0 } };

  630.     int16_t *samples;

  631.     uint8_t *samples8;

  632.     int val;

  633.     int i, res, ret;

  634.     int unp_size;

  635.     int bits, stereo;

  636.     int pred[2] = {0, 0};

  637. 

  638.     if (buf_size <= 4) {

  639.         av_log(avctx, AV_LOG_ERROR, "packet is too small\n");

  640.         return AVERROR_INVALIDDATA;

  641.     }

  642. 

  643.     unp_size = AV_RL32(buf);

  644. 

  645.     if (unp_size > (1U<<24)) {

  646.         av_log(avctx, AV_LOG_ERROR, "packet is too big\n");

  647.         return AVERROR_INVALIDDATA;

  648.     }

  649. 

  650.     if ((ret = init_get_bits8(&gb, buf + 4, buf_size - 4)) < 0)

  651.         return ret;

  652. 

  653.     if(!get_bits1(&gb)){

  654.         av_log(avctx, AV_LOG_INFO, "Sound: no data\n");

  655.         *got_frame_ptr = 0;

  656.         return 1;

  657.     }

  658.     stereo = get_bits1(&gb);

  659.     bits = get_bits1(&gb);

  660.     if (stereo ^ (avctx->channels != 1)) {

  661.         av_log(avctx, AV_LOG_ERROR, "channels mismatch\n");

  662.         return AVERROR_INVALIDDATA;

  663.     }

  664.     if (bits == (avctx->sample_fmt == AV_SAMPLE_FMT_U8)) {

  665.         av_log(avctx, AV_LOG_ERROR, "sample format mismatch\n");

  666.         return AVERROR_INVALIDDATA;

  667.     }

  668. 

  669.     /* get output buffer */

  670.     frame->nb_samples = unp_size / (avctx->channels * (bits + 1));

  671.     if (unp_size % (avctx->channels * (bits + 1))) {

  672.         av_log(avctx, AV_LOG_ERROR,

  673.                "The buffer does not contain an integer number of samples\n");

  674.         return AVERROR_INVALIDDATA;

  675.     }

  676.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)

  677.         return ret;

  678.     samples  = (int16_t *)frame->data[0];

  679.     samples8 =            frame->data[0];

  680. 

  681.     // Initialize

  682.     for(i = 0; i < (1 << (bits + stereo)); i++) {

  683.         h[i].length = 256;

  684.         h[i].maxlength = 0;

  685.         h[i].current = 0;

  686.         h[i].bits = av_mallocz(256 * 4);

  687.         h[i].lengths = av_mallocz(256 * sizeof(int));

  688.         h[i].values = av_mallocz(256 * sizeof(int));

  689.         if (!h[i].bits || !h[i].lengths || !h[i].values) {

  690.             ret = AVERROR(ENOMEM);

  691.             goto error;

  692.         }

  693.         skip_bits1(&gb);

  694.         if (smacker_decode_tree(&gb, &h[i], 0, 0) < 0) {

  695.             ret = AVERROR_INVALIDDATA;

  696.             goto error;

  697.         }

  698.         skip_bits1(&gb);

  699.         if(h[i].current > 1) {

  700.             res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,

  701.                     h[i].lengths, sizeof(int), sizeof(int),

  702.                     h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);

  703.             if(res < 0) {

  704.                 av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");

  705.                 ret = AVERROR_INVALIDDATA;

  706.                 goto error;

  707.             }

  708.         }

  709.     }

  710.     /* this codec relies on wraparound instead of clipping audio */

  711.     if(bits) { //decode 16-bit data

  712.         for(i = stereo; i >= 0; i--)

  713.             pred[i] = sign_extend(av_bswap16(get_bits(&gb, 16)), 16);

  714.         for(i = 0; i <= stereo; i++)

  715.             *samples++ = pred[i];

  716.         for(; i < unp_size / 2; i++) {

  717.             if(get_bits_left(&gb)<0)

  718.                 return AVERROR_INVALIDDATA;

  719.             if(i & stereo) {

  720.                 if(vlc[2].table)

  721.                     res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);

  722.                 else

  723.                     res = 0;

  724.                 if (res < 0) {

  725.                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");

  726.                     return AVERROR_INVALIDDATA;

  727.                 }

  728.                 val  = h[2].values[res];

  729.                 if(vlc[3].table)

  730.                     res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);

  731.                 else

  732.                     res = 0;

  733.                 if (res < 0) {

  734.                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");

  735.                     return AVERROR_INVALIDDATA;

  736.                 }

  737.                 val |= h[3].values[res] << 8;

  738.                 pred[1] += (unsigned)sign_extend(val, 16);

  739.                 *samples++ = pred[1];

  740.             } else {

  741.                 if(vlc[0].table)

  742.                     res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);

  743.                 else

  744.                     res = 0;

  745.                 if (res < 0) {

  746.                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");

  747.                     return AVERROR_INVALIDDATA;

  748.                 }

  749.                 val  = h[0].values[res];

  750.                 if(vlc[1].table)

  751.                     res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);

  752.                 else

  753.                     res = 0;

  754.                 if (res < 0) {

  755.                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");

  756.                     return AVERROR_INVALIDDATA;

  757.                 }

  758.                 val |= h[1].values[res] << 8;

  759.                 pred[0] += (unsigned)sign_extend(val, 16);

  760.                 *samples++ = pred[0];

  761.             }

  762.         }

  763.     } else { //8-bit data

  764.         for(i = stereo; i >= 0; i--)

  765.             pred[i] = get_bits(&gb, 8);

  766.         for(i = 0; i <= stereo; i++)

  767.             *samples8++ = pred[i];

  768.         for(; i < unp_size; i++) {

  769.             if(get_bits_left(&gb)<0)

  770.                 return AVERROR_INVALIDDATA;

  771.             if(i & stereo){

  772.                 if(vlc[1].table)

  773.                     res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);

  774.                 else

  775.                     res = 0;

  776.                 if (res < 0) {

  777.                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");

  778.                     return AVERROR_INVALIDDATA;

  779.                 }

  780.                 pred[1] += sign_extend(h[1].values[res], 8);

  781.                 *samples8++ = pred[1];

  782.             } else {

  783.                 if(vlc[0].table)

  784.                     res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);

  785.                 else

  786.                     res = 0;

  787.                 if (res < 0) {

  788.                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");

  789.                     return AVERROR_INVALIDDATA;

  790.                 }

  791.                 pred[0] += sign_extend(h[0].values[res], 8);

  792.                 *samples8++ = pred[0];

  793.             }

  794.         }

  795.     }

  796. 

  797.     *got_frame_ptr = 1;

  798.     ret = buf_size;

  799. 

  800. error:

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

  802.         if(vlc[i].table)

  803.             ff_free_vlc(&vlc[i]);

  804.         av_free(h[i].bits);

  805.         av_free(h[i].lengths);

  806.         av_free(h[i].values);

  807.     }

  808. 

  809.     return ret;

  810. }

  811. 

  812. AVCodec ff_smacker_decoder = {

  813.     .name           = "smackvid",

  814.     .long_name      = NULL_IF_CONFIG_SMALL("Smacker video"),

  815.     .type           = AVMEDIA_TYPE_VIDEO,

  816.     .id             = AV_CODEC_ID_SMACKVIDEO,

  817.     .priv_data_size = sizeof(SmackVContext),

  818.     .init           = decode_init,

  819.     .close          = decode_end,

  820.     .decode         = decode_frame,

  821.     .capabilities   = AV_CODEC_CAP_DR1,

  822. };

  823. 

  824. AVCodec ff_smackaud_decoder = {

  825.     .name           = "smackaud",

  826.     .long_name      = NULL_IF_CONFIG_SMALL("Smacker audio"),

  827.     .type           = AVMEDIA_TYPE_AUDIO,

  828.     .id             = AV_CODEC_ID_SMACKAUDIO,

  829.     .init           = smka_decode_init,

  830.     .decode         = smka_decode_frame,

  831.     .capabilities   = AV_CODEC_CAP_DR1,

  832. };