mirror of
https://github.com/FFmpeg/FFmpeg.git
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107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
/*
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* Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at>
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*
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* see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
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* the algorithm used
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* huffyuv codec for libavcodec.
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*/
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#ifndef AVCODEC_HUFFYUV_H
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#define AVCODEC_HUFFYUV_H
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#include <stdint.h>
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#include "avcodec.h"
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#include "dsputil.h"
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#include "get_bits.h"
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#include "put_bits.h"
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#include "lossless_videodsp.h"
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#define VLC_BITS 11
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#define MAX_BITS 16
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#define MAX_N (1<<MAX_BITS)
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#define MAX_VLC_N 16384
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#if HAVE_BIGENDIAN
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#define B 3
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#define G 2
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#define R 1
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#define A 0
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#else
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#define B 0
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#define G 1
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#define R 2
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#define A 3
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#endif
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typedef enum Predictor {
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LEFT = 0,
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PLANE,
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MEDIAN,
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} Predictor;
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typedef struct HYuvContext {
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AVCodecContext *avctx;
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Predictor predictor;
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GetBitContext gb;
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PutBitContext pb;
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int interlaced;
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int decorrelate;
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int bitstream_bpp;
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int version;
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int yuy2; //use yuy2 instead of 422P
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int bgr32; //use bgr32 instead of bgr24
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int bps;
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int n; // 1<<bps
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int vlc_n; // number of vlc codes (FFMIN(1<<bps, MAX_VLC_N))
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int alpha;
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int chroma;
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int yuv;
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int chroma_h_shift;
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int chroma_v_shift;
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int width, height;
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int flags;
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int context;
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int picture_number;
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int last_slice_end;
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uint8_t *temp[3];
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uint16_t *temp16[3]; ///< identical to temp but 16bit type
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uint64_t stats[4][MAX_VLC_N];
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uint8_t len[4][MAX_VLC_N];
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uint32_t bits[4][MAX_VLC_N];
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uint32_t pix_bgr_map[1<<VLC_BITS];
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VLC vlc[8]; //Y,U,V,A,YY,YU,YV,AA
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uint8_t *bitstream_buffer;
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unsigned int bitstream_buffer_size;
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DSPContext dsp;
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LLVidDSPContext llviddsp;
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} HYuvContext;
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void ff_huffyuv_common_init(AVCodecContext *s);
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void ff_huffyuv_common_end(HYuvContext *s);
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int ff_huffyuv_alloc_temp(HYuvContext *s);
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int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table, int n);
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#endif /* AVCODEC_HUFFYUV_H */
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