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/**
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 * @file vp56.h
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 * VP5 and VP6 compatible video decoder (common features)
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 *
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 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
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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 St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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#ifndef VP56_H
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#define VP56_H
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#include "vp56data.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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typedef struct vp56_context vp56_context_t;
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typedef struct vp56_mv vp56_mv_t;
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typedef void (*vp56_parse_vector_adjustment_t)(vp56_context_t *s,
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                                               vp56_mv_t *vect);
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typedef int (*vp56_adjust_t)(int v, int t);
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typedef void (*vp56_filter_t)(vp56_context_t *s, uint8_t *dst, uint8_t *src,
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                              int offset1, int offset2, int stride,
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                              vp56_mv_t mv, int mask, int select, int luma);
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typedef void (*vp56_parse_coeff_t)(vp56_context_t *s);
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typedef void (*vp56_default_models_init_t)(vp56_context_t *s);
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typedef void (*vp56_parse_vector_models_t)(vp56_context_t *s);
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typedef void (*vp56_parse_coeff_models_t)(vp56_context_t *s);
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typedef int (*vp56_parse_header_t)(vp56_context_t *s, uint8_t *buf,
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                                   int buf_size, int *golden_frame);
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typedef struct {
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    int high;
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    int bits;
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    const uint8_t *buffer;
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    unsigned long code_word;
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} vp56_range_coder_t;
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typedef struct {
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    uint8_t not_null_dc;
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    vp56_frame_t ref_frame;
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    DCTELEM dc_coeff;
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} vp56_ref_dc_t;
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struct vp56_mv {
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    int x;
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    int y;
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};
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typedef struct {
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    uint8_t type;
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    vp56_mv_t mv;
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} vp56_macroblock_t;
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struct vp56_context {
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    AVCodecContext *avctx;
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    DSPContext dsp;
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    ScanTable scantable;
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    AVFrame frames[3];
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    AVFrame *framep[4];
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    uint8_t *edge_emu_buffer_alloc;
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    uint8_t *edge_emu_buffer;
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    vp56_range_coder_t c;
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    vp56_range_coder_t cc;
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    vp56_range_coder_t *ccp;
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    int sub_version;
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    /* frame info */
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    int plane_width[3];
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    int plane_height[3];
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    int mb_width;   /* number of horizontal MB */
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    int mb_height;  /* number of vertical MB */
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    int block_offset[6];
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    int quantizer;
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    uint16_t dequant_dc;
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    uint16_t dequant_ac;
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    /* DC predictors management */
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    vp56_ref_dc_t *above_blocks;
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    vp56_ref_dc_t left_block[4];
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    int above_block_idx[6];
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    DCTELEM prev_dc[3][3];    /* [plan][ref_frame] */
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    /* blocks / macroblock */
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    vp56_mb_t mb_type;
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    vp56_macroblock_t *macroblocks;
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    DECLARE_ALIGNED_16(DCTELEM, block_coeff[6][64]);
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    uint8_t coeff_reorder[64];       /* used in vp6 only */
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    uint8_t coeff_index_to_pos[64];  /* used in vp6 only */
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    /* motion vectors */
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    vp56_mv_t mv[6];  /* vectors for each block in MB */
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    vp56_mv_t vector_candidate[2];
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    int vector_candidate_pos;
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    /* filtering hints */
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    int filter_header;               /* used in vp6 only */
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    int deblock_filtering;
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    int filter_selection;
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    int filter_mode;
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    int max_vector_length;
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    int sample_variance_threshold;
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    /* AC models */
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    uint8_t vector_model_sig[2];           /* delta sign */
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    uint8_t vector_model_dct[2];           /* delta coding types */
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    uint8_t vector_model_pdi[2][2];        /* predefined delta init */
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    uint8_t vector_model_pdv[2][7];        /* predefined delta values */
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    uint8_t vector_model_fdv[2][8];        /* 8 bit delta value definition */
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    uint8_t mb_type_model[3][10][10];      /* model for decoding MB type */
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    uint8_t coeff_model_dccv[2][11];       /* DC coeff value */
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    uint8_t coeff_model_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
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    uint8_t coeff_model_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
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    uint8_t coeff_model_dcct[2][36][5];    /* DC coeff coding type */
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    uint8_t coeff_model_runv[2][14];       /* run value (vp6 only) */
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    uint8_t mb_types_stats[3][10][2];      /* contextual, next MB type stats */
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    uint8_t coeff_ctx[4][64];              /* used in vp5 only */
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    uint8_t coeff_ctx_last[4];             /* used in vp5 only */
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    /* upside-down flipping hints */
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    int flip;  /* are we flipping ? */
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    int frbi;  /* first row block index in MB */
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    int srbi;  /* second row block index in MB */
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    int stride[3];  /* stride for each plan */
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    const uint8_t *vp56_coord_div;
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    vp56_parse_vector_adjustment_t parse_vector_adjustment;
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    vp56_adjust_t adjust;
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    vp56_filter_t filter;
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    vp56_parse_coeff_t parse_coeff;
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    vp56_default_models_init_t default_models_init;
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    vp56_parse_vector_models_t parse_vector_models;
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    vp56_parse_coeff_models_t parse_coeff_models;
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    vp56_parse_header_t parse_header;
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};
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void vp56_init(vp56_context_t *s, AVCodecContext *avctx, int flip);
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int vp56_free(AVCodecContext *avctx);
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void vp56_init_dequant(vp56_context_t *s, int quantizer);
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int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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                      uint8_t *buf, int buf_size);
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/**
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 * vp56 specific range coder implementation
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 */
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static inline void vp56_init_range_decoder(vp56_range_coder_t *c,
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                                           const uint8_t *buf, int buf_size)
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{
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    c->high = 255;
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    c->bits = 8;
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    c->buffer = buf;
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    c->code_word = *c->buffer++ << 8;
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    c->code_word |= *c->buffer++;
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}
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static inline int vp56_rac_get_prob(vp56_range_coder_t *c, uint8_t prob)
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{
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    unsigned int low = 1 + (((c->high - 1) * prob) / 256);
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    unsigned int low_shift = low << 8;
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    int bit = c->code_word >= low_shift;
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    if (bit) {
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        c->high -= low;
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        c->code_word -= low_shift;
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    } else {
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        c->high = low;
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    }
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    /* normalize */
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    while (c->high < 128) {
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        c->high <<= 1;
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        c->code_word <<= 1;
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        if (--c->bits == 0) {
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            c->bits = 8;
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            c->code_word |= *c->buffer++;
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        }
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    }
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    return bit;
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}
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static inline int vp56_rac_get(vp56_range_coder_t *c)
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{
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    /* equiprobable */
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    int low = (c->high + 1) >> 1;
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    unsigned int low_shift = low << 8;
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    int bit = c->code_word >= low_shift;
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    if (bit) {
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        c->high = (c->high - low) << 1;
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        c->code_word -= low_shift;
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    } else {
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        c->high = low << 1;
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    }
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    /* normalize */
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    c->code_word <<= 1;
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    if (--c->bits == 0) {
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        c->bits = 8;
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        c->code_word |= *c->buffer++;
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    }
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    return bit;
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}
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static inline int vp56_rac_gets(vp56_range_coder_t *c, int bits)
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{
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    int value = 0;
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    while (bits--) {
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        value = (value << 1) | vp56_rac_get(c);
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    }
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    return value;
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}
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static inline int vp56_rac_gets_nn(vp56_range_coder_t *c, int bits)
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{
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    int v = vp56_rac_gets(c, 7) << 1;
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    return v + !v;
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}
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static inline int vp56_rac_get_tree(vp56_range_coder_t *c,
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                                    const vp56_tree_t *tree,
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                                    const uint8_t *probs)
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{
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    while (tree->val > 0) {
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        if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
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            tree += tree->val;
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        else
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            tree++;
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    }
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    return -tree->val;
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}
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#endif /* VP56_H */