huffyuv.h 2.9 KB
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/*
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 * Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at>
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 *
 * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
 * the algorithm used
 *
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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
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
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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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * 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
 */

/**
 * @file
 * huffyuv codec for libavcodec.
 */

#ifndef AVCODEC_HUFFYUV_H
#define AVCODEC_HUFFYUV_H

#include <stdint.h>

#include "avcodec.h"
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#include "bswapdsp.h"
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#include "get_bits.h"
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#include "huffyuvdsp.h"
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#include "huffyuvencdsp.h"
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#include "put_bits.h"
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#include "lossless_videodsp.h"
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#define VLC_BITS 12
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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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typedef enum Predictor {
    LEFT = 0,
    PLANE,
    MEDIAN,
} Predictor;

typedef struct HYuvContext {
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    AVClass *class;
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    AVCodecContext *avctx;
    Predictor predictor;
    GetBitContext gb;
    PutBitContext pb;
    int interlaced;
    int decorrelate;
    int bitstream_bpp;
    int version;
    int yuy2;                               //use yuy2 instead of 422P
    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;
    int chroma;
    int yuv;
    int chroma_h_shift;
    int chroma_v_shift;
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    int width, height;
    int flags;
    int context;
    int picture_number;
    int last_slice_end;
    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];
    uint8_t len[4][MAX_VLC_N];
    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;
    unsigned int bitstream_buffer_size;
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    BswapDSPContext bdsp;
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    HuffYUVDSPContext hdsp;
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    HuffYUVEncDSPContext hencdsp;
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    LLVidDSPContext llviddsp;
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    int non_determ; // non-deterministic, multi-threaded encoder allowed
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} HYuvContext;

void ff_huffyuv_common_init(AVCodecContext *s);
void ff_huffyuv_common_end(HYuvContext *s);
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 */