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  1. /*
  2.  * Copyright (c) 2002-2014 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 "bswapdsp.h"
  36. #include "get_bits.h"
  37. #include "huffyuvdsp.h"
  38. #include "huffyuvencdsp.h"
  39. #include "put_bits.h"
  40. #include "lossless_videodsp.h"
  41.  
  42. #define VLC_BITS 12
  43.  
  44. #define MAX_BITS 16
  45. #define MAX_N (1<<MAX_BITS)
  46. #define MAX_VLC_N 16384
  47.  
  48. typedef enum Predictor {
  49.     LEFT = 0,
  50.     PLANE,
  51.     MEDIAN,
  52. } Predictor;
  53.  
  54. typedef struct HYuvContext {
  55.     AVClass *class;
  56.     AVCodecContext *avctx;
  57.     Predictor predictor;
  58.     GetBitContext gb;
  59.     PutBitContext pb;
  60.     int interlaced;
  61.     int decorrelate;
  62.     int bitstream_bpp;
  63.     int version;
  64.     int yuy2;                               //use yuy2 instead of 422P
  65.     int bgr32;                              //use bgr32 instead of bgr24
  66.     int bps;
  67.     int n;                                  // 1<<bps
  68.     int vlc_n;                              // number of vlc codes (FFMIN(1<<bps, MAX_VLC_N))
  69.     int alpha;
  70.     int chroma;
  71.     int yuv;
  72.     int chroma_h_shift;
  73.     int chroma_v_shift;
  74.     int width, height;
  75.     int flags;
  76.     int context;
  77.     int picture_number;
  78.     int last_slice_end;
  79.     uint8_t *temp[3];
  80.     uint16_t *temp16[3];                    ///< identical to temp but 16bit type
  81.     uint64_t stats[4][MAX_VLC_N];
  82.     uint8_t len[4][MAX_VLC_N];
  83.     uint32_t bits[4][MAX_VLC_N];
  84.     uint32_t pix_bgr_map[1<<VLC_BITS];
  85.     VLC vlc[8];                             //Y,U,V,A,YY,YU,YV,AA
  86.     uint8_t *bitstream_buffer;
  87.     unsigned int bitstream_buffer_size;
  88.     BswapDSPContext bdsp;
  89.     HuffYUVDSPContext hdsp;
  90.     HuffYUVEncDSPContext hencdsp;
  91.     LLVidDSPContext llviddsp;
  92.     int non_determ; // non-deterministic, multi-threaded encoder allowed
  93. } HYuvContext;
  94.  
  95. void ff_huffyuv_common_init(AVCodecContext *s);
  96. void ff_huffyuv_common_end(HYuvContext *s);
  97. int  ff_huffyuv_alloc_temp(HYuvContext *s);
  98. int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table, int n);
  99.  
  100. #endif /* AVCODEC_HUFFYUV_H */
  101.