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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. #include "avcodec.h"

  36. #include "internal.h"

  37. #include "mathops.h"

  38. 

  39. #define BITSTREAM_READER_LE

  40. #include "get_bits.h"

  41. #include "bytestream.h"

  42. 

  43. #define SMKTREE_BITS 9

  44. #define SMK_NODE 0x80000000

  45. 

  46. /*

  47.  * Decoder context

  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 > 32 || length > 3*SMKTREE_BITS) {

  101.         av_log(NULL, AV_LOG_ERROR, "length too long\n");

  102.         return AVERROR_INVALIDDATA;

  103.     }

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

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

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

  107.             return AVERROR_INVALIDDATA;

  108.         }

  109.         if(length){

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

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

  112.         } else {

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

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

  115.         }

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

  117.         hc->current++;

  118.         if(hc->maxlength < length)

  119.             hc->maxlength = length;

  120.         return 0;

  121.     } else { //Node

  122.         int r;

  123.         length++;

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

  125.         if(r)

  126.             return r;

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

  128.     }

  129. }

  130. 

  131. /**

  132.  * Decode header tree

  133.  */

  134. static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx)

  135. {

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

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

  138.         return AVERROR_INVALIDDATA;

  139.     }

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

  141.         int val, i1, i2;

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

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

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

  145.             return AVERROR_INVALIDDATA;

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

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

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

  149.             val = 0;

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

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

  152.             val = 0;

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

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

  155.             val = 0;

  156.         }

  157. 

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

  159.         return 1;

  160.     } else { //Node

  161.         int r = 0, r_new, t;

  162. 

  163.         t = hc->current++;

  164.         r = smacker_decode_bigtree(gb, hc, ctx);

  165.         if(r < 0)

  166.             return r;

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

  168.         r++;

  169.         r_new = smacker_decode_bigtree(gb, hc, ctx);

  170.         if (r_new < 0)

  171.             return r_new;

  172.         return r + r_new;

  173.     }

  174. }

  175. 

  176. /**

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

  178.  */

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

  180. {

  181.     int res;

  182.     HuffContext huff;

  183.     HuffContext tmp1, tmp2;

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

  185.     int escapes[3];

  186.     DBCtx ctx;

  187.     int err = 0;

  188. 

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

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

  191.         return AVERROR_INVALIDDATA;

  192.     }

  193. 

  194.     tmp1.length = 256;

  195.     tmp1.maxlength = 0;

  196.     tmp1.current = 0;

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

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

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

  200. 

  201.     tmp2.length = 256;

  202.     tmp2.maxlength = 0;

  203.     tmp2.current = 0;

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

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

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

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

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

  209.         err = AVERROR(ENOMEM);

  210.         goto error;

  211.     }

  212. 

  213.     if(get_bits1(gb)) {

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

  215.         if (res < 0) {

  216.             err = res;

  217.             goto error;

  218.         }

  219.         skip_bits1(gb);

  220.         if(tmp1.current > 1) {

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

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

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

  224.             if(res < 0) {

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

  226.                 err = res;

  227.                 goto error;

  228.             }

  229.         }

  230.     }

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

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

  233.     }

  234.     if(get_bits1(gb)){

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

  236.         if (res < 0) {

  237.             err = res;

  238.             goto error;

  239.         }

  240.         skip_bits1(gb);

  241.         if(tmp2.current > 1) {

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

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

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

  245.             if(res < 0) {

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

  247.                 err = res;

  248.                 goto error;

  249.             }

  250.         }

  251.     }

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

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

  254.     }

  255. 

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

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

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

  259. 

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

  261. 

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

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

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

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

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

  267.     ctx.recode1 = tmp1.values;

  268.     ctx.recode2 = tmp2.values;

  269.     ctx.last = last;

  270. 

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

  272.     huff.maxlength = 0;

  273.     huff.current = 0;

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

  275.     if (!huff.values) {

  276.         err = AVERROR(ENOMEM);

  277.         goto error;

  278.     }

  279. 

  280.     if (smacker_decode_bigtree(gb, &huff, &ctx) < 0)

  281.         err = -1;

  282.     skip_bits1(gb);

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

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

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

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

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

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

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

  290.         err = AVERROR_INVALIDDATA;

  291.     }

  292. 

  293.     *recodes = huff.values;

  294. 

  295. error:

  296.     if(vlc[0].table)

  297.         ff_free_vlc(&vlc[0]);

  298.     if(vlc[1].table)

  299.         ff_free_vlc(&vlc[1]);

  300.     av_free(tmp1.bits);

  301.     av_free(tmp1.lengths);

  302.     av_free(tmp1.values);

  303.     av_free(tmp2.bits);

  304.     av_free(tmp2.lengths);

  305.     av_free(tmp2.values);

  306. 

  307.     return err;

  308. }

  309. 

  310. static int decode_header_trees(SmackVContext *smk) {

  311.     GetBitContext gb;

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

  313. 

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

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

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

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

  318. 

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

  320. 

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

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

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

  324.         if (!smk->mmap_tbl)

  325.             return AVERROR(ENOMEM);

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

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

  328.     } else {

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

  330.         if (ret < 0)

  331.             return ret;

  332.     }

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

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

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

  336.         if (!smk->mclr_tbl)

  337.             return AVERROR(ENOMEM);

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

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

  340.     } else {

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

  342.         if (ret < 0)

  343.             return ret;

  344.     }

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

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

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

  348.         if (!smk->full_tbl)

  349.             return AVERROR(ENOMEM);

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

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

  352.     } else {

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

  354.         if (ret < 0)

  355.             return ret;

  356.     }

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

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

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

  360.         if (!smk->type_tbl)

  361.             return AVERROR(ENOMEM);

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

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

  364.     } else {

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

  366.         if (ret < 0)

  367.             return ret;

  368.     }

  369. 

  370.     return 0;

  371. }

  372. 

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

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

  375. }

  376. 

  377. /* get code and update history */

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

  379.     register int *table = recode;

  380.     int v;

  381. 

  382.     while(*table & SMK_NODE) {

  383.         if(get_bits1(gb))

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

  385.         table++;

  386.     }

  387.     v = *table;

  388. 

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

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

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

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

  393.     }

  394.     return v;

  395. }

  396. 

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

  398.                         AVPacket *avpkt)

  399. {

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

  401.     uint8_t *out;

  402.     uint32_t *pal;

  403.     GetByteContext gb2;

  404.     GetBitContext gb;

  405.     int blocks, blk, bw, bh;

  406.     int i, ret;

  407.     int stride;

  408.     int flags;

  409. 

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

  411.         return AVERROR_INVALIDDATA;

  412. 

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

  414.         return ret;

  415. 

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

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

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

  419.     flags = bytestream2_get_byteu(&gb2);

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

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

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

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

  424.     else

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

  426. 

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

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

  429. 

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

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

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

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

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

  435.         return ret;

  436. 

  437.     blk = 0;

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

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

  440.     blocks = bw * bh;

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

  442.     while(blk < blocks) {

  443.         int type, run, mode;

  444.         uint16_t pix;

  445. 

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

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

  448.         switch(type & 3){

  449.         case SMK_BLK_MONO:

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

  451.                 int clr, map;

  452.                 int hi, lo;

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

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

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

  456.                 hi = clr >> 8;

  457.                 lo = clr & 0xFF;

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

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

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

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

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

  463.                     map >>= 4;

  464.                     out += stride;

  465.                 }

  466.                 blk++;

  467.             }

  468.             break;

  469.         case SMK_BLK_FULL:

  470.             mode = 0;

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

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

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

  474.             }

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

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

  477.                 switch(mode){

  478.                 case 0:

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

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

  481.                         AV_WL16(out+2,pix);

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

  483.                         AV_WL16(out,pix);

  484.                         out += stride;

  485.                     }

  486.                     break;

  487.                 case 1:

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

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

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

  491.                     out += stride;

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

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

  494.                     out += stride;

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

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

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

  498.                     out += stride;

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

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

  501.                     break;

  502.                 case 2:

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

  504.                         uint16_t pix1, pix2;

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

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

  507.                         AV_WL16(out,pix1);

  508.                         AV_WL16(out+2,pix2);

  509.                         out += stride;

  510.                         AV_WL16(out,pix1);

  511.                         AV_WL16(out+2,pix2);

  512.                         out += stride;

  513.                     }

  514.                     break;

  515.                 }

  516.                 blk++;

  517.             }

  518.             break;

  519.         case SMK_BLK_SKIP:

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

  521.                 blk++;

  522.             break;

  523.         case SMK_BLK_FILL:

  524.             mode = type >> 8;

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

  526.                 uint32_t col;

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

  528.                 col = mode * 0x01010101;

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

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

  531.                     out += stride;

  532.                 }

  533.                 blk++;

  534.             }

  535.             break;

  536.         }

  537. 

  538.     }

  539. 

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

  541.         return ret;

  542. 

  543.     *got_frame = 1;

  544. 

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

  546.     return avpkt->size;

  547. }

  548. 

  549. 

  550. 

  551. /*

  552.  *

  553.  * Uninit smacker decoder

  554.  *

  555.  */

  556. static av_cold int decode_end(AVCodecContext *avctx)

  557. {

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

  559. 

  560.     av_freep(&smk->mmap_tbl);

  561.     av_freep(&smk->mclr_tbl);

  562.     av_freep(&smk->full_tbl);

  563.     av_freep(&smk->type_tbl);

  564. 

  565.     av_frame_free(&smk->pic);

  566. 

  567.     return 0;

  568. }

  569. 

  570. 

  571. /*

  572.  *

  573.  * Init smacker decoder

  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(EINVAL);

  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(EINVAL);

  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(EINVAL);

  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(EINVAL);

  667.     }

  668. 

  669.     /* get output buffer */

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

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

  672.         return ret;

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

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

  675. 

  676.     // Initialize

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

  678.         h[i].length = 256;

  679.         h[i].maxlength = 0;

  680.         h[i].current = 0;

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

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

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

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

  685.             ret = AVERROR(ENOMEM);

  686.             goto error;

  687.         }

  688.         skip_bits1(&gb);

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

  690.             ret = AVERROR_INVALIDDATA;

  691.             goto error;

  692.         }

  693.         skip_bits1(&gb);

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

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

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

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

  698.             if(res < 0) {

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

  700.                 ret = AVERROR_INVALIDDATA;

  701.                 goto error;

  702.             }

  703.         }

  704.     }

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

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

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

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

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

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

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

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

  713.                 return AVERROR_INVALIDDATA;

  714.             if(i & stereo) {

  715.                 if(vlc[2].table)

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

  717.                 else

  718.                     res = 0;

  719.                 if (res < 0) {

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

  721.                     return AVERROR_INVALIDDATA;

  722.                 }

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

  724.                 if(vlc[3].table)

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

  726.                 else

  727.                     res = 0;

  728.                 if (res < 0) {

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

  730.                     return AVERROR_INVALIDDATA;

  731.                 }

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

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

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

  735.             } else {

  736.                 if(vlc[0].table)

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

  738.                 else

  739.                     res = 0;

  740.                 if (res < 0) {

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

  742.                     return AVERROR_INVALIDDATA;

  743.                 }

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

  745.                 if(vlc[1].table)

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

  747.                 else

  748.                     res = 0;

  749.                 if (res < 0) {

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

  751.                     return AVERROR_INVALIDDATA;

  752.                 }

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

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

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

  756.             }

  757.         }

  758.     } else { //8-bit data

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

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

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

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

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

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

  765.                 return AVERROR_INVALIDDATA;

  766.             if(i & stereo){

  767.                 if(vlc[1].table)

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

  769.                 else

  770.                     res = 0;

  771.                 if (res < 0) {

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

  773.                     return AVERROR_INVALIDDATA;

  774.                 }

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

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

  777.             } else {

  778.                 if(vlc[0].table)

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

  780.                 else

  781.                     res = 0;

  782.                 if (res < 0) {

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

  784.                     return AVERROR_INVALIDDATA;

  785.                 }

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

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

  788.             }

  789.         }

  790.     }

  791. 

  792.     *got_frame_ptr = 1;

  793.     ret = buf_size;

  794. 

  795. error:

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

  797.         if(vlc[i].table)

  798.             ff_free_vlc(&vlc[i]);

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

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

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

  802.     }

  803. 

  804.     return ret;

  805. }

  806. 

  807. AVCodec ff_smacker_decoder = {

  808.     .name           = "smackvid",

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

  810.     .type           = AVMEDIA_TYPE_VIDEO,

  811.     .id             = AV_CODEC_ID_SMACKVIDEO,

  812.     .priv_data_size = sizeof(SmackVContext),

  813.     .init           = decode_init,

  814.     .close          = decode_end,

  815.     .decode         = decode_frame,

  816.     .capabilities   = AV_CODEC_CAP_DR1,

  817. };

  818. 

  819. AVCodec ff_smackaud_decoder = {

  820.     .name           = "smackaud",

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

  822.     .type           = AVMEDIA_TYPE_AUDIO,

  823.     .id             = AV_CODEC_ID_SMACKAUDIO,

  824.     .init           = smka_decode_init,

  825.     .decode         = smka_decode_frame,

  826.     .capabilities   = AV_CODEC_CAP_DR1,

  827. };