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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. #ifndef AVCODEC_HQX_H
  22. #define AVCODEC_HQX_H
  23.  
  24. #include <stdint.h>
  25.  
  26. #include "libavutil/frame.h"
  27. #include "libavutil/mem.h"
  28. #include "get_bits.h"
  29. #include "hqxdsp.h"
  30.  
  31. enum HQXACMode {
  32.     HQX_AC_Q0 = 0,
  33.     HQX_AC_Q8,
  34.     HQX_AC_Q16,
  35.     HQX_AC_Q32,
  36.     HQX_AC_Q64,
  37.     HQX_AC_Q128,
  38.     NUM_HQX_AC
  39. };
  40.  
  41. typedef struct HQXLUT {
  42.     int16_t lev;
  43.     uint8_t run;
  44.     int8_t  bits;
  45. } HQXLUT;
  46.  
  47. typedef struct HQXAC {
  48.     int lut_bits, extra_bits;
  49.     const HQXLUT *lut;
  50. } HQXAC;
  51.  
  52. struct HQXContext;
  53.  
  54. typedef int (*mb_decode_func)(struct HQXContext *ctx,
  55.                               int slice_no, int x, int y);
  56.  
  57. typedef struct HQXSlice {
  58.     GetBitContext gb;
  59.     DECLARE_ALIGNED(16, int16_t, block)[16][64];
  60. } HQXSlice;
  61.  
  62. typedef struct HQXContext {
  63.     HQXDSPContext hqxdsp;
  64.     HQXSlice slice[16];
  65.  
  66.     AVFrame *pic;
  67.     mb_decode_func decode_func;
  68.  
  69.     int format, dcb, width, height;
  70.     int interlaced;
  71.  
  72.     uint8_t *src;
  73.     unsigned int data_size;
  74.     uint32_t slice_off[17];
  75.  
  76.     VLC cbp_vlc;
  77.     VLC dc_vlc[3];
  78. } HQXContext;
  79.  
  80. #define HQX_DC_VLC_BITS 9
  81.  
  82. extern const HQXAC ff_hqx_ac[NUM_HQX_AC];
  83.  
  84. int ff_hqx_init_vlcs(HQXContext *ctx);
  85.  
  86. #endif /* AVCODEC_HQX_H */
  87.