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FFmpeg/libavcodec/hqx.c

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  1. /*

  2.  * Canopus HQX decoder

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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 "canopus.h"

  28. #include "get_bits.h"

  29. #include "internal.h"

  30. #include "thread.h"

  31. 

  32. #include "hqx.h"

  33. #include "hqxdsp.h"

  34. 

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

  36. enum HQXFormat {

  37.     HQX_422 = 0,

  38.     HQX_444,

  39.     HQX_422A,

  40.     HQX_444A,

  41. };

  42. 

  43. #define HQX_HEADER_SIZE 59

  44. 

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

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

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

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

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

  50.     {  0x1,   0x2,   0x4,   0x8 }, {  0x1,  0x3,   0x6,   0xC },

  51.     {  0x2,   0x4,   0x8,  0x10 }, {  0x3,  0x6,   0xC,  0x18 },

  52.     {  0x4,   0x8,  0x10,  0x20 }, {  0x6,  0xC,  0x18,  0x30 },

  53.     {  0x8,  0x10,  0x20,  0x40 },

  54.                       { 0xA, 0x14, 0x28, 0x50 },

  55.                                    {  0xC, 0x18,  0x30,  0x60 },

  56.     { 0x10,  0x20,  0x40,  0x80 }, { 0x18, 0x30,  0x60,  0xC0 },

  57.     { 0x20,  0x40,  0x80, 0x100 }, { 0x30, 0x60,  0xC0, 0x180 },

  58.     { 0x40,  0x80, 0x100, 0x200 }, { 0x60, 0xC0, 0x180, 0x300 },

  59.     { 0x80, 0x100, 0x200, 0x400 }

  60. };

  61. 

  62. static const uint8_t hqx_quant_luma[64] = {

  63.     16,  16,  16,  19,  19,  19,  42,  44,

  64.     16,  16,  19,  19,  19,  38,  43,  45,

  65.     16,  19,  19,  19,  40,  41,  45,  48,

  66.     19,  19,  19,  40,  41,  42,  46,  49,

  67.     19,  19,  40,  41,  42,  43,  48, 101,

  68.     19,  38,  41,  42,  43,  44,  98, 104,

  69.     42,  43,  45,  46,  48,  98, 109, 116,

  70.     44,  45,  48,  49, 101, 104, 116, 123,

  71. };

  72. 

  73. static const uint8_t hqx_quant_chroma[64] = {

  74.     16,  16,  19,  25,  26,  26,  42,  44,

  75.     16,  19,  25,  25,  26,  38,  43,  91,

  76.     19,  25,  26,  27,  40,  41,  91,  96,

  77.     25,  25,  27,  40,  41,  84,  93, 197,

  78.     26,  26,  40,  41,  84,  86, 191, 203,

  79.     26,  38,  41,  84,  86, 177, 197, 209,

  80.     42,  43,  91,  93, 191, 197, 219, 232,

  81.     44,  91,  96, 197, 203, 209, 232, 246,

  82. };

  83. 

  84. static inline void put_blocks(HQXContext *ctx, int plane,

  85.                               int x, int y, int ilace,

  86.                               int16_t *block0, int16_t *block1,

  87.                               const uint8_t *quant)

  88. {

  89.     int fields = ilace ? 2 : 1;

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

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

  92. 

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

  94.                          lsize * fields, block0, quant);

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

  96.                          lsize * fields, block1, quant);

  97. }

  98. 

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

  100.                               int *run, int *lev)

  101. {

  102.     int val;

  103. 

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

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

  106.         GetBitContext gb2 = *gb;

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

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

  109.     }

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

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

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

  113. }

  114. 

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

  116.                         const int *quants, int dcb,

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

  118. {

  119.     int q, dc;

  120.     int ac_idx;

  121.     int run, lev, pos = 1;

  122. 

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

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

  125.     if (dc < 0)

  126.         return AVERROR_INVALIDDATA;

  127.     *last_dc += dc;

  128. 

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

  130. 

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

  132.     if (q >= 128)

  133.         ac_idx = HQX_AC_Q128;

  134.     else if (q >= 64)

  135.         ac_idx = HQX_AC_Q64;

  136.     else if (q >= 32)

  137.         ac_idx = HQX_AC_Q32;

  138.     else if (q >= 16)

  139.         ac_idx = HQX_AC_Q16;

  140.     else if (q >= 8)

  141.         ac_idx = HQX_AC_Q8;

  142.     else

  143.         ac_idx = HQX_AC_Q0;

  144. 

  145.     do {

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

  147.         pos += run;

  148.         if (pos >= 64)

  149.             break;

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

  151.     } while (pos < 64);

  152. 

  153.     return 0;

  154. }

  155. 

  156. static int hqx_decode_422(HQXContext *ctx, int slice_no, int x, int y)

  157. {

  158.     HQXSlice *slice = &ctx->slice[slice_no];

  159.     GetBitContext *gb = &slice->gb;

  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, slice->block[i], &last_dc);

  178.         if (ret < 0)

  179.             return ret;

  180.     }

  181. 

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

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

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

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

  186. 

  187.     return 0;

  188. }

  189. 

  190. static int hqx_decode_422a(HQXContext *ctx, int slice_no, int x, int y)

  191. {

  192.     HQXSlice *slice = &ctx->slice[slice_no];

  193.     GetBitContext *gb = &slice->gb;

  194.     const int *quants;

  195.     int flag = 0;

  196.     int last_dc;

  197.     int i, ret;

  198.     int cbp;

  199. 

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

  201. 

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

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

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

  205.         slice->block[i][0] = -0x800;

  206.     if (cbp) {

  207.         if (ctx->interlaced)

  208.             flag = get_bits1(gb);

  209. 

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

  211. 

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

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

  214.             cbp |= 0x500;

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

  216.             cbp |= 0xA00;

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

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

  219.                 last_dc = 0;

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

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

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

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

  224.                 if (ret < 0)

  225.                     return ret;

  226.             }

  227.         }

  228.     }

  229. 

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

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

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

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

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

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

  236. 

  237.     return 0;

  238. }

  239. 

  240. static int hqx_decode_444(HQXContext *ctx, int slice_no, int x, int y)

  241. {

  242.     HQXSlice *slice = &ctx->slice[slice_no];

  243.     GetBitContext *gb = &slice->gb;

  244.     const int *quants;

  245.     int flag;

  246.     int last_dc;

  247.     int i, ret;

  248. 

  249.     if (ctx->interlaced)

  250.         flag = get_bits1(gb);

  251.     else

  252.         flag = 0;

  253. 

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

  255. 

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

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

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

  259.             last_dc = 0;

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

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

  262.         if (ret < 0)

  263.             return ret;

  264.     }

  265. 

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

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

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

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

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

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

  272. 

  273.     return 0;

  274. }

  275. 

  276. static int hqx_decode_444a(HQXContext *ctx, int slice_no, int x, int y)

  277. {

  278.     HQXSlice *slice = &ctx->slice[slice_no];

  279.     GetBitContext *gb = &slice->gb;

  280.     const int *quants;

  281.     int flag = 0;

  282.     int last_dc;

  283.     int i, ret;

  284.     int cbp;

  285. 

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

  287. 

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

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

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

  291.         slice->block[i][0] = -0x800;

  292.     if (cbp) {

  293.         if (ctx->interlaced)

  294.             flag = get_bits1(gb);

  295. 

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

  297. 

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

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

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

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

  302.                 last_dc = 0;

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

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

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

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

  307.                 if (ret < 0)

  308.                     return ret;

  309.             }

  310.         }

  311.     }

  312. 

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

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

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

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

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

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

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

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

  321. 

  322.     return 0;

  323. }

  324. 

  325. static const int shuffle_16[16] = {

  326.     0, 5, 11, 14, 2, 7, 9, 13, 1, 4, 10, 15, 3, 6, 8, 12

  327. };

  328. 

  329. static int decode_slice(HQXContext *ctx, int slice_no)

  330. {

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

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

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

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

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

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

  337.     int grp_v_rest = mb_w - grp_h_edge;

  338.     int grp_h_rest = mb_h - grp_v_edge;

  339.     int num_mbs = mb_w * mb_h;

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

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

  342.     int g_tile = slice_no * num_tiles;

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

  344.     int tile_blocks, tile_limit, tile_no;

  345. 

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

  347.         tile_blocks = std_tile_blocks;

  348.         tile_limit = -1;

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

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

  351.             tile_blocks++;

  352.         }

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

  354.             if (i == tile_limit)

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

  356.             else

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

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

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

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

  361.             if (loc_row >= grp_v_edge) {

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

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

  364.             } else {

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

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

  367.             }

  368.             if (mb_x >= grp_h_edge) {

  369.                 mb_x +=            pos % grp_v_rest;

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

  371.             } else {

  372.                 mb_x +=            pos % grp_w;

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

  374.             }

  375.             ctx->decode_func(ctx, slice_no, mb_x * 16, mb_y * 16);

  376.         }

  377.     }

  378. 

  379.     return 0;

  380. }

  381. 

  382. static int decode_slice_thread(AVCodecContext *avctx, void *arg,

  383.                                int slice_no, int threadnr)

  384. {

  385.     HQXContext *ctx = avctx->priv_data;

  386.     uint32_t *slice_off = ctx->slice_off;

  387.     int ret;

  388. 

  389.     if (slice_off[slice_no] < HQX_HEADER_SIZE ||

  390.         slice_off[slice_no] >= slice_off[slice_no + 1] ||

  391.         slice_off[slice_no + 1] > ctx->data_size) {

  392.         av_log(avctx, AV_LOG_ERROR, "Invalid slice size %d.\n", ctx->data_size);

  393.         return AVERROR_INVALIDDATA;

  394.     }

  395. 

  396.     ret = init_get_bits8(&ctx->slice[slice_no].gb,

  397.                          ctx->src + slice_off[slice_no],

  398.                          slice_off[slice_no + 1] - slice_off[slice_no]);

  399.     if (ret < 0)

  400.         return ret;

  401. 

  402.     return decode_slice(ctx, slice_no);

  403. }

  404. 

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

  406.                             int *got_picture_ptr, AVPacket *avpkt)

  407. {

  408.     HQXContext *ctx = avctx->priv_data;

  409.     ThreadFrame frame = { .f = data };

  410.     uint8_t *src = avpkt->data;

  411.     uint32_t info_tag;

  412.     int data_start;

  413.     int i, ret;

  414. 

  415.     if (avpkt->size < 4 + 4) {

  416.         av_log(avctx, AV_LOG_ERROR, "Frame is too small %d.\n", avpkt->size);

  417.         return AVERROR_INVALIDDATA;

  418.     }

  419. 

  420.     info_tag    = AV_RL32(src);

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

  422.         uint32_t info_offset = AV_RL32(src + 4);

  423.         if (info_offset > INT_MAX || info_offset + 8 > avpkt->size) {

  424.             av_log(avctx, AV_LOG_ERROR,

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

  426.                    info_offset);

  427.             return AVERROR_INVALIDDATA;

  428.         }

  429.         ff_canopus_parse_info_tag(avctx, src + 8, info_offset);

  430. 

  431.         info_offset += 8;

  432.         src         += info_offset;

  433.     }

  434. 

  435.     data_start     = src - avpkt->data;

  436.     ctx->data_size = avpkt->size - data_start;

  437.     ctx->src       = src;

  438.     ctx->pic       = data;

  439. 

  440.     if (ctx->data_size < HQX_HEADER_SIZE) {

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

  442.         return AVERROR_INVALIDDATA;

  443.     }

  444. 

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

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

  447.         return AVERROR_INVALIDDATA;

  448.     }

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

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

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

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

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

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

  455.         ctx->slice_off[i] = AV_RB24(src + 8 + i * 3);

  456. 

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

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

  459.         return AVERROR_INVALIDDATA;

  460.     }

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

  462.     if (ret < 0) {

  463.         av_log(avctx, AV_LOG_ERROR, "Invalid stored dimensions %dx%d.\n",

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

  465.         return AVERROR_INVALIDDATA;

  466.     }

  467. 

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

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

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

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

  472.     avctx->bits_per_raw_sample = 10;

  473. 

  474.     switch (ctx->format) {

  475.     case HQX_422:

  476.         avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

  477.         ctx->decode_func = hqx_decode_422;

  478.         break;

  479.     case HQX_444:

  480.         avctx->pix_fmt = AV_PIX_FMT_YUV444P16;

  481.         ctx->decode_func = hqx_decode_444;

  482.         break;

  483.     case HQX_422A:

  484.         avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;

  485.         ctx->decode_func = hqx_decode_422a;

  486.         break;

  487.     case HQX_444A:

  488.         avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;

  489.         ctx->decode_func = hqx_decode_444a;

  490.         break;

  491.     default:

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

  493.         return AVERROR_INVALIDDATA;

  494.     }

  495. 

  496.     ret = ff_thread_get_buffer(avctx, &frame, 0);

  497.     if (ret < 0)

  498.         return ret;

  499. 

  500.     avctx->execute2(avctx, decode_slice_thread, NULL, NULL, 16);

  501. 

  502.     ctx->pic->key_frame = 1;

  503.     ctx->pic->pict_type = AV_PICTURE_TYPE_I;

  504. 

  505.     *got_picture_ptr = 1;

  506. 

  507.     return avpkt->size;

  508. }

  509. 

  510. static av_cold int hqx_decode_close(AVCodecContext *avctx)

  511. {

  512.     int i;

  513.     HQXContext *ctx = avctx->priv_data;

  514. 

  515.     if (avctx->internal->is_copy)

  516.         return 0;

  517. 

  518.     ff_free_vlc(&ctx->cbp_vlc);

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

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

  521.     }

  522. 

  523.     return 0;

  524. }

  525. 

  526. static av_cold int hqx_decode_init(AVCodecContext *avctx)

  527. {

  528.     HQXContext *ctx = avctx->priv_data;

  529. 

  530.     ff_hqxdsp_init(&ctx->hqxdsp);

  531. 

  532.     return ff_hqx_init_vlcs(ctx);

  533. }

  534. 

  535. AVCodec ff_hqx_decoder = {

  536.     .name           = "hqx",

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

  538.     .type           = AVMEDIA_TYPE_VIDEO,

  539.     .id             = AV_CODEC_ID_HQX,

  540.     .priv_data_size = sizeof(HQXContext),

  541.     .init           = hqx_decode_init,

  542.     .decode         = hqx_decode_frame,

  543.     .close          = hqx_decode_close,

  544.     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS |

  545.                       AV_CODEC_CAP_FRAME_THREADS,

  546.     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |

  547.                       FF_CODEC_CAP_INIT_CLEANUP,

  548. };