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 "bswapdsp.h"
  36 #include "get_bits.h"
  37 #include "huffyuvdsp.h"
  38 #include "huffyuvencdsp.h"
  39 #include "put_bits.h"
  40
  41 #define VLC_BITS 11
  42
  43 #if HAVE_BIGENDIAN
  44 #define B 3
  45 #define G 2
  46 #define R 1
  47 #define A 0
  48 #else
  49 #define B 0
  50 #define G 1
  51 #define R 2
  52 #define A 3
  53 #endif
  54
  55 typedef enum Predictor {
  56     LEFT = 0,
  57     PLANE,
  58     MEDIAN,
  59 } Predictor;
  60
  61 typedef struct HYuvContext {
  62     const AVClass *class;
  63     AVCodecContext *avctx;
  64     Predictor predictor;
  65     GetBitContext gb;
  66     PutBitContext pb;
  67     int interlaced;
  68     int decorrelate;
  69     int bitstream_bpp;
  70     int version;
  71     int yuy2;                               //use yuy2 instead of 422P
  72     int bgr32;                              //use bgr32 instead of bgr24
  73     int width, height;
  74     int flags;
  75     int context;
  76     int picture_number;
  77     int last_slice_end;
  78     uint8_t *temp[3];
  79     uint64_t stats[3][256];
  80     uint8_t len[3][256];
  81     uint32_t bits[3][256];
  82     uint32_t pix_bgr_map[1<<VLC_BITS];
  83     VLC vlc[6];                             //Y,U,V,YY,YU,YV
  84     uint8_t *bitstream_buffer;
  85     unsigned int bitstream_buffer_size;
  86     BswapDSPContext bdsp;
  87     HuffYUVDSPContext hdsp;
  88     HuffYUVEncDSPContext hencdsp;
  89 } HYuvContext;
  90
  91 void ff_huffyuv_common_init(AVCodecContext *s);
  92 void ff_huffyuv_common_end(HYuvContext *s);
  93 int  ff_huffyuv_alloc_temp(HYuvContext *s);
  94 int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table);
  95
  96 #endif /* AVCODEC_HUFFYUV_H */