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  1. /*
  2.  * Copyright (c) 2002-2003 Michael Niedermayer <michaelni@gmx.at>
  3.  *
  4.  * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
  5.  * the algorithm used
  6.  *
  7.  * This file is part of FFmpeg.
  8.  *
  9.  * FFmpeg is free software; you can redistribute it and/or
  10.  * modify it under the terms of the GNU Lesser General Public
  11.  * License as published by the Free Software Foundation; either
  12.  * version 2.1 of the License, or (at your option) any later version.
  13.  *
  14.  * FFmpeg is distributed in the hope that it will be useful,
  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17.  * Lesser General Public License for more details.
  18.  *
  19.  * You should have received a copy of the GNU Lesser General Public
  20.  * License along with FFmpeg; if not, write to the Free Software
  21.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22.  */
  23.  
  24. /**
  25.  * @file
  26.  * huffyuv codec for libavcodec.
  27.  */
  28.  
  29. #ifndef AVCODEC_HUFFYUV_H
  30. #define AVCODEC_HUFFYUV_H
  31.  
  32. #include <stdint.h>
  33.  
  34. #include "avcodec.h"
  35. #include "dsputil.h"
  36. #include "get_bits.h"
  37. #include "put_bits.h"
  38.  
  39. #define VLC_BITS 11
  40.  
  41. #if HAVE_BIGENDIAN
  42. #define B 3
  43. #define G 2
  44. #define R 1
  45. #define A 0
  46. #else
  47. #define B 0
  48. #define G 1
  49. #define R 2
  50. #define A 3
  51. #endif
  52.  
  53. typedef enum Predictor {
  54.     LEFT = 0,
  55.     PLANE,
  56.     MEDIAN,
  57. } Predictor;
  58.  
  59. typedef struct HYuvContext {
  60.     AVCodecContext *avctx;
  61.     Predictor predictor;
  62.     GetBitContext gb;
  63.     PutBitContext pb;
  64.     int interlaced;
  65.     int decorrelate;
  66.     int bitstream_bpp;
  67.     int version;
  68.     int yuy2;                               //use yuy2 instead of 422P
  69.     int bgr32;                              //use bgr32 instead of bgr24
  70.     int width, height;
  71.     int flags;
  72.     int context;
  73.     int picture_number;
  74.     int last_slice_end;
  75.     uint8_t *temp[3];
  76.     uint64_t stats[3][256];
  77.     uint8_t len[3][256];
  78.     uint32_t bits[3][256];
  79.     uint32_t pix_bgr_map[1<<VLC_BITS];
  80.     VLC vlc[6];                             //Y,U,V,YY,YU,YV
  81.     AVFrame picture;
  82.     uint8_t *bitstream_buffer;
  83.     unsigned int bitstream_buffer_size;
  84.     DSPContext dsp;
  85. } HYuvContext;
  86.  
  87. void ff_huffyuv_common_init(AVCodecContext *s);
  88. void ff_huffyuv_common_end(HYuvContext *s);
  89. int  ff_huffyuv_alloc_temp(HYuvContext *s);
  90. int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table);
  91.  
  92. #endif /* AVCODEC_HUFFYUV_H */
  93.