libavcodec/huffyuv.h

   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 Libav.
   8  *
   9  * Libav 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  * Libav 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 Libav; 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 */