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FFmpeg/libavcodec/hqx.c

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  1. /*

  2.  * Canopus HQX decoder

  3.  *

  4.  * This file is part of Libav.

  5.  *

  6.  * Libav is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * Libav is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with Libav; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. #include <inttypes.h>

  22. 

  23. #include "libavutil/imgutils.h"

  24. #include "libavutil/intreadwrite.h"

  25. 

  26. #include "avcodec.h"

  27. #include "get_bits.h"

  28. #include "internal.h"

  29. 

  30. #include "hqx.h"

  31. #include "hqxdsp.h"

  32. 

  33. /* HQX has four modes - 422, 444, 422alpha and 444alpha - all 12-bit */

  34. enum HQXFormat {

  35.     HQX_422 = 0,

  36.     HQX_444,

  37.     HQX_422A,

  38.     HQX_444A,

  39. };

  40. 

  41. #define HQX_HEADER_SIZE 59

  42. 

  43. typedef int (*mb_decode_func)(HQXContext *ctx, AVFrame *pic,

  44.                               GetBitContext *gb, int x, int y);

  45. 

  46. /* macroblock selects a group of 4 possible quants and

  47.  * a block can use any of those four quantisers

  48.  * one column is powers of 2, the other one is powers of 2 * 3,

  49.  * then there is the special one, powers of 2 * 5 */

  50. static const int hqx_quants[16][4] = {

  51.     {  0x1,   0x2,   0x4,   0x8 }, {  0x1,  0x3,   0x6,   0xC },

  52.     {  0x2,   0x4,   0x8,  0x10 }, {  0x3,  0x6,   0xC,  0x18 },

  53.     {  0x4,   0x8,  0x10,  0x20 }, {  0x6,  0xC,  0x18,  0x30 },

  54.     {  0x8,  0x10,  0x20,  0x40 },

  55.                       { 0xA, 0x14, 0x28, 0x50 },

  56.                                    {  0xC, 0x18,  0x30,  0x60 },

  57.     { 0x10,  0x20,  0x40,  0x80 }, { 0x18, 0x30,  0x60,  0xC0 },

  58.     { 0x20,  0x40,  0x80, 0x100 }, { 0x30, 0x60,  0xC0, 0x180 },

  59.     { 0x40,  0x80, 0x100, 0x200 }, { 0x60, 0xC0, 0x180, 0x300 },

  60.     { 0x80, 0x100, 0x200, 0x400 }

  61. };

  62. 

  63. static const uint8_t hqx_quant_luma[64] = {

  64.     16,  16,  16,  19,  19,  19,  42,  44,

  65.     16,  16,  19,  19,  19,  38,  43,  45,

  66.     16,  19,  19,  19,  40,  41,  45,  48,

  67.     19,  19,  19,  40,  41,  42,  46,  49,

  68.     19,  19,  40,  41,  42,  43,  48, 101,

  69.     19,  38,  41,  42,  43,  44,  98, 104,

  70.     42,  43,  45,  46,  48,  98, 109, 116,

  71.     44,  45,  48,  49, 101, 104, 116, 123,

  72. };

  73. 

  74. static const uint8_t hqx_quant_chroma[64] = {

  75.     16,  16,  19,  25,  26,  26,  42,  44,

  76.     16,  19,  25,  25,  26,  38,  43,  91,

  77.     19,  25,  26,  27,  40,  41,  91,  96,

  78.     25,  25,  27,  40,  41,  84,  93, 197,

  79.     26,  26,  40,  41,  84,  86, 191, 203,

  80.     26,  38,  41,  84,  86, 177, 197, 209,

  81.     42,  43,  91,  93, 191, 197, 219, 232,

  82.     44,  91,  96, 197, 203, 209, 232, 246,

  83. };

  84. 

  85. static inline void put_blocks(HQXContext *ctx, AVFrame *pic, int plane,

  86.                               int x, int y, int ilace,

  87.                               int16_t *block0, int16_t *block1,

  88.                               const uint8_t *quant)

  89. {

  90.     int fields = ilace ? 2 : 1;

  91.     int lsize = pic->linesize[plane];

  92.     uint8_t *p = pic->data[plane] + x * 2;

  93. 

  94.     ctx->hqxdsp.idct_put((uint16_t *)(p + y * lsize),

  95.                          lsize * fields, block0, quant);

  96.     ctx->hqxdsp.idct_put((uint16_t *)(p + (y + (ilace ? 1 : 8)) * lsize),

  97.                          lsize * fields, block1, quant);

  98. }

  99. 

  100. static inline void hqx_get_ac(GetBitContext *gb, const HQXAC *ac,

  101.                               int *run, int *lev)

  102. {

  103.     int val;

  104. 

  105.     val = show_bits(gb, ac->lut_bits);

  106.     if (ac->lut[val].bits == -1) {

  107.         GetBitContext gb2 = *gb;

  108.         skip_bits(&gb2, ac->lut_bits);

  109.         val = ac->lut[val].lev + show_bits(&gb2, ac->extra_bits);

  110.     }

  111.     *run = ac->lut[val].run;

  112.     *lev = ac->lut[val].lev;

  113.     skip_bits(gb, ac->lut[val].bits);

  114. }

  115. 

  116. static int decode_block(GetBitContext *gb, VLC *vlc,

  117.                         const int *quants, int dcb,

  118.                         int16_t block[64], int *last_dc)

  119. {

  120.     int q, dc;

  121.     int ac_idx;

  122.     int run, lev, pos = 1;

  123. 

  124.     memset(block, 0, 64 * sizeof(*block));

  125.     dc = get_vlc2(gb, vlc->table, HQX_DC_VLC_BITS, 2);

  126.     if (dc < 0)

  127.         return AVERROR_INVALIDDATA;

  128.     *last_dc += dc;

  129. 

  130.     block[0] = sign_extend(*last_dc << (12 - dcb), 12);

  131. 

  132.     q = quants[get_bits(gb, 2)];

  133.     if (q >= 128)

  134.         ac_idx = HQX_AC_Q128;

  135.     else if (q >= 64)

  136.         ac_idx = HQX_AC_Q64;

  137.     else if (q >= 32)

  138.         ac_idx = HQX_AC_Q32;

  139.     else if (q >= 16)

  140.         ac_idx = HQX_AC_Q16;

  141.     else if (q >= 8)

  142.         ac_idx = HQX_AC_Q8;

  143.     else

  144.         ac_idx = HQX_AC_Q0;

  145. 

  146.     do {

  147.         hqx_get_ac(gb, &ff_hqx_ac[ac_idx], &run, &lev);

  148.         pos += run;

  149.         if (pos >= 64)

  150.             break;

  151.         block[ff_zigzag_direct[pos++]] = lev * q;

  152.     } while (pos < 64);

  153. 

  154.     return 0;

  155. }

  156. 

  157. static int hqx_decode_422(HQXContext *ctx, AVFrame *pic,

  158.                           GetBitContext *gb, int x, int y)

  159. {

  160.     const int *quants;

  161.     int flag;

  162.     int last_dc;

  163.     int i, ret;

  164. 

  165.     if (ctx->interlaced)

  166.         flag = get_bits1(gb);

  167.     else

  168.         flag = 0;

  169. 

  170.     quants = hqx_quants[get_bits(gb, 4)];

  171. 

  172.     for (i = 0; i < 8; i++) {

  173.         int vlc_index = ctx->dcb - 9;

  174.         if (i == 0 || i == 4 || i == 6)

  175.             last_dc = 0;

  176.         ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,

  177.                            ctx->dcb, ctx->block[i], &last_dc);

  178.         if (ret < 0)

  179.             return ret;

  180.     }

  181. 

  182.     put_blocks(ctx, pic, 0, x,      y, flag, ctx->block[0], ctx->block[2], hqx_quant_luma);

  183.     put_blocks(ctx, pic, 0, x + 8,  y, flag, ctx->block[1], ctx->block[3], hqx_quant_luma);

  184.     put_blocks(ctx, pic, 2, x >> 1, y, flag, ctx->block[4], ctx->block[5], hqx_quant_chroma);

  185.     put_blocks(ctx, pic, 1, x >> 1, y, flag, ctx->block[6], ctx->block[7], hqx_quant_chroma);

  186. 

  187.     return 0;

  188. }

  189. 

  190. static int hqx_decode_422a(HQXContext *ctx, AVFrame *pic,

  191.                            GetBitContext *gb, int x, int y)

  192. {

  193.     const int *quants;

  194.     int flag = 0;

  195.     int last_dc;

  196.     int i, ret;

  197.     int cbp;

  198. 

  199.     cbp = get_vlc2(gb, ctx->cbp_vlc.table, ctx->cbp_vlc.bits, 1);

  200. 

  201.     for (i = 0; i < 12; i++)

  202.         memset(ctx->block[i], 0, sizeof(**ctx->block) * 64);

  203.     for (i = 0; i < 12; i++)

  204.         ctx->block[i][0] = -0x800;

  205.     if (cbp) {

  206.         if (ctx->interlaced)

  207.             flag = get_bits1(gb);

  208. 

  209.         quants = hqx_quants[get_bits(gb, 4)];

  210. 

  211.         cbp |= cbp << 4; // alpha CBP

  212.         if (cbp & 0x3)   // chroma CBP - top

  213.             cbp |= 0x500;

  214.         if (cbp & 0xC)   // chroma CBP - bottom

  215.             cbp |= 0xA00;

  216.         for (i = 0; i < 12; i++) {

  217.             if (i == 0 || i == 4 || i == 8 || i == 10)

  218.                 last_dc = 0;

  219.             if (cbp & (1 << i)) {

  220.                 int vlc_index = ctx->dcb - 9;

  221.                 ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,

  222.                                    ctx->dcb, ctx->block[i], &last_dc);

  223.                 if (ret < 0)

  224.                     return ret;

  225.             }

  226.         }

  227.     }

  228. 

  229.     put_blocks(ctx, pic, 3, x,      y, flag, ctx->block[ 0], ctx->block[ 2], hqx_quant_luma);

  230.     put_blocks(ctx, pic, 3, x + 8,  y, flag, ctx->block[ 1], ctx->block[ 3], hqx_quant_luma);

  231.     put_blocks(ctx, pic, 0, x,      y, flag, ctx->block[ 4], ctx->block[ 6], hqx_quant_luma);

  232.     put_blocks(ctx, pic, 0, x + 8,  y, flag, ctx->block[ 5], ctx->block[ 7], hqx_quant_luma);

  233.     put_blocks(ctx, pic, 2, x >> 1, y, flag, ctx->block[ 8], ctx->block[ 9], hqx_quant_chroma);

  234.     put_blocks(ctx, pic, 1, x >> 1, y, flag, ctx->block[10], ctx->block[11], hqx_quant_chroma);

  235. 

  236.     return 0;

  237. }

  238. 

  239. static int hqx_decode_444(HQXContext *ctx, AVFrame *pic,

  240.                           GetBitContext *gb, int x, int y)

  241. {

  242.     const int *quants;

  243.     int flag;

  244.     int last_dc;

  245.     int i, ret;

  246. 

  247.     if (ctx->interlaced)

  248.         flag = get_bits1(gb);

  249.     else

  250.         flag = 0;

  251. 

  252.     quants = hqx_quants[get_bits(gb, 4)];

  253. 

  254.     for (i = 0; i < 12; i++) {

  255.         int vlc_index = ctx->dcb - 9;

  256.         if (i == 0 || i == 4 || i == 8)

  257.             last_dc = 0;

  258.         ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,

  259.                            ctx->dcb, ctx->block[i], &last_dc);

  260.         if (ret < 0)

  261.             return ret;

  262.     }

  263. 

  264.     put_blocks(ctx, pic, 0, x,     y, flag, ctx->block[0], ctx->block[ 2], hqx_quant_luma);

  265.     put_blocks(ctx, pic, 0, x + 8, y, flag, ctx->block[1], ctx->block[ 3], hqx_quant_luma);

  266.     put_blocks(ctx, pic, 2, x,     y, flag, ctx->block[4], ctx->block[ 6], hqx_quant_chroma);

  267.     put_blocks(ctx, pic, 2, x + 8, y, flag, ctx->block[5], ctx->block[ 7], hqx_quant_chroma);

  268.     put_blocks(ctx, pic, 1, x,     y, flag, ctx->block[8], ctx->block[10], hqx_quant_chroma);

  269.     put_blocks(ctx, pic, 1, x + 8, y, flag, ctx->block[9], ctx->block[11], hqx_quant_chroma);

  270. 

  271.     return 0;

  272. }

  273. 

  274. static int hqx_decode_444a(HQXContext *ctx, AVFrame *pic,

  275.                            GetBitContext *gb, int x, int y)

  276. {

  277.     const int *quants;

  278.     int flag = 0;

  279.     int last_dc;

  280.     int i, ret;

  281.     int cbp;

  282. 

  283.     cbp = get_vlc2(gb, ctx->cbp_vlc.table, ctx->cbp_vlc.bits, 1);

  284. 

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

  286.         memset(ctx->block[i], 0, sizeof(**ctx->block) * 64);

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

  288.         ctx->block[i][0] = -0x800;

  289.     if (cbp) {

  290.         if (ctx->interlaced)

  291.             flag = get_bits1(gb);

  292. 

  293.         quants = hqx_quants[get_bits(gb, 4)];

  294. 

  295.         cbp |= cbp << 4; // alpha CBP

  296.         cbp |= cbp << 8; // chroma CBP

  297.         for (i = 0; i < 16; i++) {

  298.             if (i == 0 || i == 4 || i == 8 || i == 12)

  299.                 last_dc = 0;

  300.             if (cbp & (1 << i)) {

  301.                 int vlc_index = ctx->dcb - 9;

  302.                 ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,

  303.                                    ctx->dcb, ctx->block[i], &last_dc);

  304.                 if (ret < 0)

  305.                     return ret;

  306.             }

  307.         }

  308.     }

  309. 

  310.     put_blocks(ctx, pic, 3, x,     y, flag, ctx->block[ 0], ctx->block[ 2], hqx_quant_luma);

  311.     put_blocks(ctx, pic, 3, x + 8, y, flag, ctx->block[ 1], ctx->block[ 3], hqx_quant_luma);

  312.     put_blocks(ctx, pic, 0, x,     y, flag, ctx->block[ 4], ctx->block[ 6], hqx_quant_luma);

  313.     put_blocks(ctx, pic, 0, x + 8, y, flag, ctx->block[ 5], ctx->block[ 7], hqx_quant_luma);

  314.     put_blocks(ctx, pic, 2, x,     y, flag, ctx->block[ 8], ctx->block[10], hqx_quant_chroma);

  315.     put_blocks(ctx, pic, 2, x + 8, y, flag, ctx->block[ 9], ctx->block[11], hqx_quant_chroma);

  316.     put_blocks(ctx, pic, 1, x,     y, flag, ctx->block[12], ctx->block[14], hqx_quant_chroma);

  317.     put_blocks(ctx, pic, 1, x + 8, y, flag, ctx->block[13], ctx->block[15], hqx_quant_chroma);

  318. 

  319.     return 0;

  320. }

  321. 

  322. static const int shuffle_16[16] = {

  323.     0, 5, 11, 14, 2, 7, 9, 13, 1, 4, 10, 15, 3, 6, 8, 12

  324. };

  325. 

  326. static int decode_slice(HQXContext *ctx, AVFrame *pic, GetBitContext *gb,

  327.                         int slice_no, mb_decode_func decode_func)

  328. {

  329.     int mb_w = (ctx->width  + 15) >> 4;

  330.     int mb_h = (ctx->height + 15) >> 4;

  331.     int grp_w = (mb_w + 4) / 5;

  332.     int grp_h = (mb_h + 4) / 5;

  333.     int grp_h_edge = grp_w * (mb_w / grp_w);

  334.     int grp_v_edge = grp_h * (mb_h / grp_h);

  335.     int grp_v_rest = mb_w - grp_h_edge;

  336.     int grp_h_rest = mb_h - grp_v_edge;

  337.     int num_mbs = mb_w * mb_h;

  338.     int num_tiles = (num_mbs + 479) / 480;

  339.     int std_tile_blocks = num_mbs / (16 * num_tiles);

  340.     int g_tile = slice_no * num_tiles;

  341.     int blk_addr, loc_addr, mb_x, mb_y, pos, loc_row, i;

  342.     int tile_blocks, tile_limit, tile_no;

  343. 

  344.     for (tile_no = 0; tile_no < num_tiles; tile_no++, g_tile++) {

  345.         tile_blocks = std_tile_blocks;

  346.         tile_limit = -1;

  347.         if (g_tile < num_mbs - std_tile_blocks * 16 * num_tiles) {

  348.             tile_limit = num_mbs / (16 * num_tiles);

  349.             tile_blocks++;

  350.         }

  351.         for (i = 0; i < tile_blocks; i++) {

  352.             if (i == tile_limit)

  353.                 blk_addr = g_tile + 16 * num_tiles * i;

  354.             else

  355.                 blk_addr = tile_no + 16 * num_tiles * i +

  356.                            num_tiles * shuffle_16[(i + slice_no) & 0xF];

  357.             loc_row  = grp_h * (blk_addr / (grp_h * mb_w));

  358.             loc_addr =          blk_addr % (grp_h * mb_w);

  359.             if (loc_row >= grp_v_edge) {

  360.                 mb_x = grp_w * (loc_addr / (grp_h_rest * grp_w));

  361.                 pos  =          loc_addr % (grp_h_rest * grp_w);

  362.             } else {

  363.                 mb_x = grp_w * (loc_addr / (grp_h * grp_w));

  364.                 pos  =          loc_addr % (grp_h * grp_w);

  365.             }

  366.             if (mb_x >= grp_h_edge) {

  367.                 mb_x +=            pos % grp_v_rest;

  368.                 mb_y  = loc_row + (pos / grp_v_rest);

  369.             } else {

  370.                 mb_x +=            pos % grp_w;

  371.                 mb_y  = loc_row + (pos / grp_w);

  372.             }

  373.             decode_func(ctx, pic, gb, mb_x * 16, mb_y * 16);

  374.         }

  375.     }

  376. 

  377.     return 0;

  378. }

  379. 

  380. static int hqx_decode_frame(AVCodecContext *avctx, void *data,

  381.                             int *got_picture_ptr, AVPacket *avpkt)

  382. {

  383.     HQXContext *ctx = avctx->priv_data;

  384.     AVFrame *pic = data;

  385.     uint8_t *src = avpkt->data;

  386.     uint32_t info_tag, info_offset;

  387.     int data_start;

  388.     unsigned data_size;

  389.     GetBitContext gb;

  390.     int i, ret;

  391.     int slice;

  392.     uint32_t slice_off[17];

  393.     mb_decode_func decode_func = 0;

  394. 

  395.     if (avpkt->size < 8)

  396.         return AVERROR_INVALIDDATA;

  397. 

  398.     /* Skip the INFO header if present */

  399.     info_offset = 0;

  400.     info_tag    = AV_RL32(src);

  401.     if (info_tag == MKTAG('I', 'N', 'F', 'O')) {

  402.         info_offset = AV_RL32(src + 4);

  403.         if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) {

  404.             av_log(avctx, AV_LOG_ERROR,

  405.                    "Invalid INFO header offset: 0x%08"PRIX32" is too large.\n",

  406.                    info_offset);

  407.             return AVERROR_INVALIDDATA;

  408.         }

  409. 

  410.         info_offset += 8;

  411.         src         += info_offset;

  412. 

  413.         av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n");

  414.     }

  415. 

  416.     data_start = src - avpkt->data;

  417.     data_size  = avpkt->size - data_start;

  418. 

  419.     if (data_size < HQX_HEADER_SIZE) {

  420.         av_log(avctx, AV_LOG_ERROR, "Frame too small.\n");

  421.         return AVERROR_INVALIDDATA;

  422.     }

  423. 

  424.     if (src[0] != 'H' || src[1] != 'Q') {

  425.         av_log(avctx, AV_LOG_ERROR, "Not an HQX frame.\n");

  426.         return AVERROR_INVALIDDATA;

  427.     }

  428.     ctx->interlaced = !(src[2] & 0x80);

  429.     ctx->format     = src[2] & 7;

  430.     ctx->dcb        = (src[3] & 3) + 8;

  431.     ctx->width      = AV_RB16(src + 4);

  432.     ctx->height     = AV_RB16(src + 6);

  433.     for (i = 0; i < 17; i++)

  434.         slice_off[i] = AV_RB24(src + 8 + i * 3);

  435. 

  436.     if (ctx->dcb == 8) {

  437.         av_log(avctx, AV_LOG_ERROR, "Invalid DC precision %d.\n", ctx->dcb);

  438.         return AVERROR_INVALIDDATA;

  439.     }

  440.     ret = av_image_check_size(ctx->width, ctx->height, 0, avctx);

  441.     if (ret < 0) {

  442.         av_log(avctx, AV_LOG_ERROR, "Invalid stored dimenstions %dx%d.\n",

  443.                ctx->width, ctx->height);

  444.         return AVERROR_INVALIDDATA;

  445.     }

  446. 

  447.     avctx->coded_width         = FFALIGN(ctx->width,  16);

  448.     avctx->coded_height        = FFALIGN(ctx->height, 16);

  449.     avctx->width               = ctx->width;

  450.     avctx->height              = ctx->height;

  451.     avctx->bits_per_raw_sample = 10;

  452. 

  453.     switch (ctx->format) {

  454.     case HQX_422:

  455.         avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

  456.         decode_func = hqx_decode_422;

  457.         break;

  458.     case HQX_444:

  459.         avctx->pix_fmt = AV_PIX_FMT_YUV444P16;

  460.         decode_func = hqx_decode_444;

  461.         break;

  462.     case HQX_422A:

  463.         avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;

  464.         decode_func = hqx_decode_422a;

  465.         break;

  466.     case HQX_444A:

  467.         avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;

  468.         decode_func = hqx_decode_444a;

  469.         break;

  470.     default:

  471.         av_log(avctx, AV_LOG_ERROR, "Invalid format: %d.\n", ctx->format);

  472.         return AVERROR_INVALIDDATA;

  473.     }

  474. 

  475.     ret = ff_get_buffer(avctx, pic, 0);

  476.     if (ret < 0) {

  477.         av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");

  478.         return ret;

  479.     }

  480. 

  481.     for (slice = 0; slice < 16; slice++) {

  482.         if (slice_off[slice] < HQX_HEADER_SIZE ||

  483.             slice_off[slice] >= slice_off[slice + 1] ||

  484.             slice_off[slice + 1] > data_size) {

  485.             av_log(avctx, AV_LOG_ERROR, "Invalid slice size.\n");

  486.             break;

  487.         }

  488.         ret = init_get_bits(&gb, src + slice_off[slice],

  489.                             (slice_off[slice + 1] - slice_off[slice]) * 8);

  490.         if (ret < 0)

  491.             return ret;

  492.         ret = decode_slice(ctx, pic, &gb, slice, decode_func);

  493.         if (ret < 0) {

  494.             av_log(avctx, AV_LOG_ERROR, "Error decoding slice %d.\n", slice);

  495.         }

  496.     }

  497. 

  498.     pic->key_frame = 1;

  499.     pic->pict_type = AV_PICTURE_TYPE_I;

  500. 

  501.     *got_picture_ptr = 1;

  502. 

  503.     return avpkt->size;

  504. }

  505. 

  506. static av_cold int hqx_decode_close(AVCodecContext *avctx)

  507. {

  508.     int i;

  509.     HQXContext *ctx = avctx->priv_data;

  510. 

  511.     ff_free_vlc(&ctx->cbp_vlc);

  512.     for (i = 0; i < 3; i++) {

  513.         ff_free_vlc(&ctx->dc_vlc[i]);

  514.     }

  515. 

  516.     return 0;

  517. }

  518. 

  519. static av_cold int hqx_decode_init(AVCodecContext *avctx)

  520. {

  521.     HQXContext *ctx = avctx->priv_data;

  522.     int ret = ff_hqx_init_vlcs(ctx);

  523.     if (ret < 0)

  524.         hqx_decode_close(avctx);

  525. 

  526.     ff_hqxdsp_init(&ctx->hqxdsp);

  527. 

  528.     return ret;

  529. }

  530. 

  531. AVCodec ff_hqx_decoder = {

  532.     .name           = "hqx",

  533.     .long_name      = NULL_IF_CONFIG_SMALL("Canopus HQX"),

  534.     .type           = AVMEDIA_TYPE_VIDEO,

  535.     .id             = AV_CODEC_ID_HQX,

  536.     .priv_data_size = sizeof(HQXContext),

  537.     .init           = hqx_decode_init,

  538.     .decode         = hqx_decode_frame,

  539.     .close          = hqx_decode_close,

  540.     .capabilities   = CODEC_CAP_DR1,

  541. };