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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 "bitstream.h"

  28. #include "canopus.h"

  29. #include "internal.h"

  30. 

  31. #include "hqx.h"

  32. #include "hqxdsp.h"

  33. 

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

  35. enum HQXFormat {

  36.     HQX_422 = 0,

  37.     HQX_444,

  38.     HQX_422A,

  39.     HQX_444A,

  40. };

  41. 

  42. #define HQX_HEADER_SIZE 59

  43. 

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

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

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

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

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

  49.     {  0x1,   0x2,   0x4,   0x8 }, {  0x1,  0x3,   0x6,   0xC },

  50.     {  0x2,   0x4,   0x8,  0x10 }, {  0x3,  0x6,   0xC,  0x18 },

  51.     {  0x4,   0x8,  0x10,  0x20 }, {  0x6,  0xC,  0x18,  0x30 },

  52.     {  0x8,  0x10,  0x20,  0x40 },

  53.                       { 0xA, 0x14, 0x28, 0x50 },

  54.                                    {  0xC, 0x18,  0x30,  0x60 },

  55.     { 0x10,  0x20,  0x40,  0x80 }, { 0x18, 0x30,  0x60,  0xC0 },

  56.     { 0x20,  0x40,  0x80, 0x100 }, { 0x30, 0x60,  0xC0, 0x180 },

  57.     { 0x40,  0x80, 0x100, 0x200 }, { 0x60, 0xC0, 0x180, 0x300 },

  58.     { 0x80, 0x100, 0x200, 0x400 }

  59. };

  60. 

  61. static const uint8_t hqx_quant_luma[64] = {

  62.     16,  16,  16,  19,  19,  19,  42,  44,

  63.     16,  16,  19,  19,  19,  38,  43,  45,

  64.     16,  19,  19,  19,  40,  41,  45,  48,

  65.     19,  19,  19,  40,  41,  42,  46,  49,

  66.     19,  19,  40,  41,  42,  43,  48, 101,

  67.     19,  38,  41,  42,  43,  44,  98, 104,

  68.     42,  43,  45,  46,  48,  98, 109, 116,

  69.     44,  45,  48,  49, 101, 104, 116, 123,

  70. };

  71. 

  72. static const uint8_t hqx_quant_chroma[64] = {

  73.     16,  16,  19,  25,  26,  26,  42,  44,

  74.     16,  19,  25,  25,  26,  38,  43,  91,

  75.     19,  25,  26,  27,  40,  41,  91,  96,

  76.     25,  25,  27,  40,  41,  84,  93, 197,

  77.     26,  26,  40,  41,  84,  86, 191, 203,

  78.     26,  38,  41,  84,  86, 177, 197, 209,

  79.     42,  43,  91,  93, 191, 197, 219, 232,

  80.     44,  91,  96, 197, 203, 209, 232, 246,

  81. };

  82. 

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

  84.                               int x, int y, int ilace,

  85.                               int16_t *block0, int16_t *block1,

  86.                               const uint8_t *quant)

  87. {

  88.     int fields = ilace ? 2 : 1;

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

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

  91. 

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

  93.                          lsize * fields, block0, quant);

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

  95.                          lsize * fields, block1, quant);

  96. }

  97. 

  98. static inline void hqx_get_ac(BitstreamContext *bc, const HQXAC *ac,

  99.                               int *run, int *lev)

  100. {

  101.     int val;

  102. 

  103.     val = bitstream_peek(bc, ac->lut_bits);

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

  105.         BitstreamContext bc2 = *bc;

  106.         bitstream_skip(&bc2, ac->lut_bits);

  107.         val = ac->lut[val].lev + bitstream_peek(&bc2, ac->extra_bits);

  108.     }

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

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

  111.     bitstream_skip(bc, ac->lut[val].bits);

  112. }

  113. 

  114. static int decode_block(BitstreamContext *bc, VLC *vlc,

  115.                         const int *quants, int dcb,

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

  117. {

  118.     int q, dc;

  119.     int ac_idx;

  120.     int run, lev, pos = 1;

  121. 

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

  123.     dc = bitstream_read_vlc(bc, vlc->table, HQX_DC_VLC_BITS, 2);

  124.     if (dc < 0)

  125.         return AVERROR_INVALIDDATA;

  126.     *last_dc += dc;

  127. 

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

  129. 

  130.     q = quants[bitstream_read(bc, 2)];

  131.     if (q >= 128)

  132.         ac_idx = HQX_AC_Q128;

  133.     else if (q >= 64)

  134.         ac_idx = HQX_AC_Q64;

  135.     else if (q >= 32)

  136.         ac_idx = HQX_AC_Q32;

  137.     else if (q >= 16)

  138.         ac_idx = HQX_AC_Q16;

  139.     else if (q >= 8)

  140.         ac_idx = HQX_AC_Q8;

  141.     else

  142.         ac_idx = HQX_AC_Q0;

  143. 

  144.     do {

  145.         hqx_get_ac(bc, &ff_hqx_ac[ac_idx], &run, &lev);

  146.         pos += run;

  147.         if (pos >= 64)

  148.             break;

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

  150.     } while (pos < 64);

  151. 

  152.     return 0;

  153. }

  154. 

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

  156. {

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

  158.     BitstreamContext *bc = &slice->bc;

  159.     const int *quants;

  160.     int flag;

  161.     int last_dc;

  162.     int i, ret;

  163. 

  164.     if (ctx->interlaced)

  165.         flag = bitstream_read_bit(bc);

  166.     else

  167.         flag = 0;

  168. 

  169.     quants = hqx_quants[bitstream_read(bc, 4)];

  170. 

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

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

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

  174.             last_dc = 0;

  175.         ret = decode_block(bc, &ctx->dc_vlc[vlc_index], quants,

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

  177.         if (ret < 0)

  178.             return ret;

  179.     }

  180. 

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

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

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

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

  185. 

  186.     return 0;

  187. }

  188. 

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

  190. {

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

  192.     BitstreamContext *bc = &slice->bc;

  193.     const int *quants;

  194.     int flag = 0;

  195.     int last_dc;

  196.     int i, ret;

  197.     int cbp;

  198. 

  199.     cbp = bitstream_read_vlc(bc, ctx->cbp_vlc.table, ctx->cbp_vlc.bits, 1);

  200. 

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

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

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

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

  205.     if (cbp) {

  206.         if (ctx->interlaced)

  207.             flag = bitstream_read_bit(bc);

  208. 

  209.         quants = hqx_quants[bitstream_read(bc, 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(bc, &ctx->dc_vlc[vlc_index], quants,

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

  223.                 if (ret < 0)

  224.                     return ret;

  225.             }

  226.         }

  227.     }

  228. 

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

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

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

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

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

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

  235. 

  236.     return 0;

  237. }

  238. 

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

  240. {

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

  242.     BitstreamContext *bc = &slice->bc;

  243.     const int *quants;

  244.     int flag;

  245.     int last_dc;

  246.     int i, ret;

  247. 

  248.     if (ctx->interlaced)

  249.         flag = bitstream_read_bit(bc);

  250.     else

  251.         flag = 0;

  252. 

  253.     quants = hqx_quants[bitstream_read(bc, 4)];

  254. 

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

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

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

  258.             last_dc = 0;

  259.         ret = decode_block(bc, &ctx->dc_vlc[vlc_index], quants,

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

  261.         if (ret < 0)

  262.             return ret;

  263.     }

  264. 

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

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

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

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

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

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

  271. 

  272.     return 0;

  273. }

  274. 

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

  276. {

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

  278.     BitstreamContext *bc = &slice->bc;

  279.     const int *quants;

  280.     int flag = 0;

  281.     int last_dc;

  282.     int i, ret;

  283.     int cbp;

  284. 

  285.     cbp = bitstream_read_vlc(bc, ctx->cbp_vlc.table, ctx->cbp_vlc.bits, 1);

  286. 

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

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

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

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

  291.     if (cbp) {

  292.         if (ctx->interlaced)

  293.             flag = bitstream_read_bit(bc);

  294. 

  295.         quants = hqx_quants[bitstream_read(bc, 4)];

  296. 

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

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

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

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

  301.                 last_dc = 0;

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

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

  304.                 ret = decode_block(bc, &ctx->dc_vlc[vlc_index], quants,

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

  306.                 if (ret < 0)

  307.                     return ret;

  308.             }

  309.         }

  310.     }

  311. 

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

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

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

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

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

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

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

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

  320. 

  321.     return 0;

  322. }

  323. 

  324. static const int shuffle_16[16] = {

  325.     0, 5, 11, 14, 2, 7, 9, 13, 1, 4, 10, 15, 3, 6, 8, 12

  326. };

  327. 

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

  329. {

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

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

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

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

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

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

  336.     int grp_v_rest = mb_w - grp_h_edge;

  337.     int grp_h_rest = mb_h - grp_v_edge;

  338.     int num_mbs = mb_w * mb_h;

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

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

  341.     int g_tile = slice_no * num_tiles;

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

  343.     int tile_blocks, tile_limit, tile_no;

  344. 

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

  346.         tile_blocks = std_tile_blocks;

  347.         tile_limit = -1;

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

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

  350.             tile_blocks++;

  351.         }

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

  353.             if (i == tile_limit)

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

  355.             else

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

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

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

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

  360.             if (loc_row >= grp_v_edge) {

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

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

  363.             } else {

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

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

  366.             }

  367.             if (mb_x >= grp_h_edge) {

  368.                 mb_x +=            pos % grp_v_rest;

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

  370.             } else {

  371.                 mb_x +=            pos % grp_w;

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

  373.             }

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

  375.         }

  376.     }

  377. 

  378.     return 0;

  379. }

  380. 

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

  382.                                int slice_no, int threadnr)

  383. {

  384.     HQXContext *ctx = avctx->priv_data;

  385.     uint32_t *slice_off = ctx->slice_off;

  386.     int ret;

  387. 

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

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

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

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

  392.         return AVERROR_INVALIDDATA;

  393.     }

  394. 

  395.     ret = bitstream_init8(&ctx->slice[slice_no].bc,

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

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

  398.     if (ret < 0)

  399.         return ret;

  400. 

  401.     return decode_slice(ctx, slice_no);

  402. }

  403. 

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

  405.                             int *got_picture_ptr, AVPacket *avpkt)

  406. {

  407.     HQXContext *ctx = avctx->priv_data;

  408.     uint8_t *src = avpkt->data;

  409.     uint32_t info_tag;

  410.     int data_start;

  411.     int i, ret;

  412. 

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

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

  415.         return AVERROR_INVALIDDATA;

  416.     }

  417. 

  418.     info_tag    = AV_RL32(src);

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

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

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

  422.             av_log(avctx, AV_LOG_ERROR,

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

  424.                    info_offset);

  425.             return AVERROR_INVALIDDATA;

  426.         }

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

  428. 

  429.         info_offset += 8;

  430.         src         += info_offset;

  431.     }

  432. 

  433.     data_start     = src - avpkt->data;

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

  435.     ctx->src       = src;

  436.     ctx->pic       = data;

  437. 

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

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

  440.         return AVERROR_INVALIDDATA;

  441.     }

  442. 

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

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

  445.         return AVERROR_INVALIDDATA;

  446.     }

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

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

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

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

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

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

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

  454. 

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

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

  457.         return AVERROR_INVALIDDATA;

  458.     }

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

  460.     if (ret < 0) {

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

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

  463.         return AVERROR_INVALIDDATA;

  464.     }

  465. 

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

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

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

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

  470.     avctx->bits_per_raw_sample = 10;

  471. 

  472.     switch (ctx->format) {

  473.     case HQX_422:

  474.         avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

  475.         ctx->decode_func = hqx_decode_422;

  476.         break;

  477.     case HQX_444:

  478.         avctx->pix_fmt = AV_PIX_FMT_YUV444P16;

  479.         ctx->decode_func = hqx_decode_444;

  480.         break;

  481.     case HQX_422A:

  482.         avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;

  483.         ctx->decode_func = hqx_decode_422a;

  484.         break;

  485.     case HQX_444A:

  486.         avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;

  487.         ctx->decode_func = hqx_decode_444a;

  488.         break;

  489.     default:

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

  491.         return AVERROR_INVALIDDATA;

  492.     }

  493. 

  494.     ret = ff_get_buffer(avctx, ctx->pic, 0);

  495.     if (ret < 0) {

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

  497.         return ret;

  498.     }

  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.     ff_free_vlc(&ctx->cbp_vlc);

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

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

  518.     }

  519. 

  520.     return 0;

  521. }

  522. 

  523. static av_cold int hqx_decode_init(AVCodecContext *avctx)

  524. {

  525.     HQXContext *ctx = avctx->priv_data;

  526. 

  527.     ff_hqxdsp_init(&ctx->hqxdsp);

  528. 

  529.     return ff_hqx_init_vlcs(ctx);

  530. }

  531. 

  532. AVCodec ff_hqx_decoder = {

  533.     .name           = "hqx",

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

  535.     .type           = AVMEDIA_TYPE_VIDEO,

  536.     .id             = AV_CODEC_ID_HQX,

  537.     .priv_data_size = sizeof(HQXContext),

  538.     .init           = hqx_decode_init,

  539.     .decode         = hqx_decode_frame,

  540.     .close          = hqx_decode_close,

  541.     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,

  542.     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |

  543.                       FF_CODEC_CAP_INIT_CLEANUP,

  544. };