GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/vp56.h Lines: 79 79 100.0 %
Date: 2021-04-15 16:04:23 Branches: 28 28 100.0 %

Line Branch Exec Source
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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 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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 * VP5 and VP6 compatible video decoder (common features)
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 */
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#ifndef AVCODEC_VP56_H
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#define AVCODEC_VP56_H
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#include "libavutil/mem_internal.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "hpeldsp.h"
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#include "bytestream.h"
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#include "h264chroma.h"
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#include "videodsp.h"
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#include "vp3dsp.h"
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#include "vp56dsp.h"
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typedef struct vp56_context VP56Context;
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typedef enum {
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    VP56_FRAME_NONE     =-1,
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    VP56_FRAME_CURRENT  = 0,
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    VP56_FRAME_PREVIOUS = 1,
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    VP56_FRAME_GOLDEN   = 2,
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    VP56_FRAME_GOLDEN2  = 3,
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} VP56Frame;
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typedef enum {
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    VP56_MB_INTER_NOVEC_PF = 0,  /**< Inter MB, no vector, from previous frame */
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    VP56_MB_INTRA          = 1,  /**< Intra MB */
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    VP56_MB_INTER_DELTA_PF = 2,  /**< Inter MB, above/left vector + delta, from previous frame */
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    VP56_MB_INTER_V1_PF    = 3,  /**< Inter MB, first vector, from previous frame */
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    VP56_MB_INTER_V2_PF    = 4,  /**< Inter MB, second vector, from previous frame */
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    VP56_MB_INTER_NOVEC_GF = 5,  /**< Inter MB, no vector, from golden frame */
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    VP56_MB_INTER_DELTA_GF = 6,  /**< Inter MB, above/left vector + delta, from golden frame */
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    VP56_MB_INTER_4V       = 7,  /**< Inter MB, 4 vectors, from previous frame */
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    VP56_MB_INTER_V1_GF    = 8,  /**< Inter MB, first vector, from golden frame */
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    VP56_MB_INTER_V2_GF    = 9,  /**< Inter MB, second vector, from golden frame */
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} VP56mb;
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typedef struct VP56Tree {
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  int8_t val;
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  int8_t prob_idx;
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} VP56Tree;
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typedef struct VP56mv {
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    DECLARE_ALIGNED(4, int16_t, x);
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    int16_t y;
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} VP56mv;
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#define VP56_SIZE_CHANGE 1
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typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
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                                          VP56mv *vect);
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typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
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                           int offset1, int offset2, ptrdiff_t stride,
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                           VP56mv mv, int mask, int select, int luma);
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typedef int  (*VP56ParseCoeff)(VP56Context *s);
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typedef void (*VP56DefaultModelsInit)(VP56Context *s);
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typedef void (*VP56ParseVectorModels)(VP56Context *s);
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typedef int  (*VP56ParseCoeffModels)(VP56Context *s);
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typedef int  (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
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                                int buf_size);
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typedef struct VP56RangeCoder {
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    int high;
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    int bits; /* stored negated (i.e. negative "bits" is a positive number of
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                 bits left) in order to eliminate a negate in cache refilling */
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    const uint8_t *buffer;
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    const uint8_t *end;
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    unsigned int code_word;
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    int end_reached;
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} VP56RangeCoder;
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typedef struct VP56RefDc {
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    uint8_t not_null_dc;
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    VP56Frame ref_frame;
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    int16_t dc_coeff;
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} VP56RefDc;
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typedef struct VP56Macroblock {
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    uint8_t type;
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    VP56mv mv;
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} VP56Macroblock;
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typedef struct VP56Model {
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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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    uint8_t coeff_index_to_idct_selector[64]; /* used in vp6 only */
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    uint8_t vector_sig[2];           /* delta sign */
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    uint8_t vector_dct[2];           /* delta coding types */
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    uint8_t vector_pdi[2][2];        /* predefined delta init */
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    uint8_t vector_pdv[2][7];        /* predefined delta values */
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    uint8_t vector_fdv[2][8];        /* 8 bit delta value definition */
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    uint8_t coeff_dccv[2][11];       /* DC coeff value */
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    uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
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    uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
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    uint8_t coeff_dcct[2][36][5];    /* DC coeff coding type */
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    uint8_t coeff_runv[2][14];       /* run value (vp6 only) */
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    uint8_t mb_type[3][10][10];      /* model for decoding MB type */
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    uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
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} VP56Model;
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struct vp56_context {
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    AVCodecContext *avctx;
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    H264ChromaContext h264chroma;
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    HpelDSPContext hdsp;
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    VideoDSPContext vdsp;
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    VP3DSPContext vp3dsp;
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    VP56DSPContext vp56dsp;
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    uint8_t idct_scantable[64];
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    AVFrame *frames[4];
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    uint8_t *edge_emu_buffer_alloc;
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    uint8_t *edge_emu_buffer;
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    VP56RangeCoder c;
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    VP56RangeCoder cc;
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    VP56RangeCoder *ccp;
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    int sub_version;
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    /* frame info */
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    int golden_frame;
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    int plane_width[4];
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    int plane_height[4];
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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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    VP56RefDc *above_blocks;
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    VP56RefDc left_block[4];
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    int above_block_idx[6];
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    int16_t prev_dc[3][3];    /* [plan][ref_frame] */
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    /* blocks / macroblock */
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    VP56mb mb_type;
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    VP56Macroblock *macroblocks;
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    DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
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    int idct_selector[6];
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    /* motion vectors */
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    VP56mv mv[6];  /* vectors for each block in MB */
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    VP56mv 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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    DECLARE_ALIGNED(8, int, bounding_values_array)[256];
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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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    int has_alpha;
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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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    ptrdiff_t stride[4];  /* stride for each plan */
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    const uint8_t *vp56_coord_div;
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    VP56ParseVectorAdjustment parse_vector_adjustment;
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    VP56Filter filter;
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    VP56ParseCoeff parse_coeff;
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    VP56DefaultModelsInit default_models_init;
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    VP56ParseVectorModels parse_vector_models;
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    VP56ParseCoeffModels parse_coeff_models;
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    VP56ParseHeader parse_header;
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    /* for "slice" parallelism between YUV and A */
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    VP56Context *alpha_context;
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    VP56Model *modelp;
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    VP56Model model;
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    /* huffman decoding */
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    int use_huffman;
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    GetBitContext gb;
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    VLC dccv_vlc[2];
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    VLC runv_vlc[2];
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    VLC ract_vlc[2][3][6];
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    unsigned int nb_null[2][2];       /* number of consecutive NULL DC/AC */
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    int have_undamaged_frame;
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    int discard_frame;
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};
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int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
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int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
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                          int flip, int has_alpha);
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int ff_vp56_free(AVCodecContext *avctx);
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int ff_vp56_free_context(VP56Context *s);
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void ff_vp56_init_dequant(VP56Context *s, int quantizer);
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int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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                         AVPacket *avpkt);
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/**
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 * vp56 specific range coder implementation
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 */
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extern const uint8_t ff_vp56_norm_shift[256];
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int ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
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/**
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 * vp5689 returns 1 if the end of the stream has been reached, 0 otherwise.
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 */
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746181
static av_always_inline int vpX_rac_is_end(VP56RangeCoder *c)
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{
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746181
    if (c->end <= c->buffer && c->bits >= 0)
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        c->end_reached ++;
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746181
    return c->end_reached > 10;
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}
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97273225
static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
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{
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97273225
    int shift = ff_vp56_norm_shift[c->high];
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97273225
    int bits = c->bits;
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97273225
    unsigned int code_word = c->code_word;
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97273225
    c->high   <<= shift;
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97273225
    code_word <<= shift;
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97273225
    bits       += shift;
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97273225
    if(bits >= 0 && c->buffer < c->end) {
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4198198
        code_word |= bytestream_get_be16(&c->buffer) << bits;
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4198198
        bits -= 16;
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    }
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97273225
    c->bits = bits;
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97273225
    return code_word;
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}
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#if   ARCH_ARM
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#include "arm/vp56_arith.h"
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#elif ARCH_X86
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#include "x86/vp56_arith.h"
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#endif
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#ifndef vp56_rac_get_prob
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#define vp56_rac_get_prob vp56_rac_get_prob
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static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
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{
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    unsigned int code_word = vp56_rac_renorm(c);
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    unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
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    unsigned int low_shift = low << 16;
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    int bit = code_word >= low_shift;
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    c->high = bit ? c->high - low : low;
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    c->code_word = bit ? code_word - low_shift : code_word;
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    return bit;
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}
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#endif
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#ifndef vp56_rac_get_prob_branchy
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// branchy variant, to be used where there's a branch based on the bit decoded
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66664388
static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
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{
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66664388
    unsigned long code_word = vp56_rac_renorm(c);
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66664388
    unsigned low = 1 + (((c->high - 1) * prob) >> 8);
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66664388
    unsigned low_shift = low << 16;
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66664388
    if (code_word >= low_shift) {
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30814739
        c->high     -= low;
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30814739
        c->code_word = code_word - low_shift;
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30814739
        return 1;
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    }
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35849649
    c->high = low;
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35849649
    c->code_word = code_word;
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35849649
    return 0;
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}
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#endif
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1303604
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
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{
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1303604
    unsigned int code_word = vp56_rac_renorm(c);
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    /* equiprobable */
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1303604
    int low = (c->high + 1) >> 1;
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1303604
    unsigned int low_shift = low << 16;
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1303604
    int bit = code_word >= low_shift;
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1303604
    if (bit) {
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651693
        c->high   -= low;
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651693
        code_word -= low_shift;
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    } else {
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651911
        c->high = low;
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    }
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1303604
    c->code_word = code_word;
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1303604
    return bit;
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}
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// rounding is different than vp56_rac_get, is vp56_rac_get wrong?
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10177309
static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
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{
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10177309
    return vp56_rac_get_prob(c, 128);
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}
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52237
static int vp56_rac_gets(VP56RangeCoder *c, int bits)
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{
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52237
    int value = 0;
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203495
    while (bits--) {
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151258
        value = (value << 1) | vp56_rac_get(c);
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    }
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52237
    return value;
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}
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48182
static int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
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{
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48182
    int value = 0;
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292059
    while (bits--) {
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243877
        value = (value << 1) | vp8_rac_get(c);
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    }
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48182
    return value;
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}
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// fixme: add 1 bit to all the calls to this?
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6104
static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
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{
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    int v;
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6104
    if (!vp8_rac_get(c))
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5361
        return 0;
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    v = vp8_rac_get_uint(c, bits);
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    if (vp8_rac_get(c))
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        v = -v;
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    return v;
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}
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// P(7)
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8496
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
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{
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8496
    int v = vp56_rac_gets(c, 7) << 1;
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8496
    return v + !v;
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}
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static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
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{
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306
    int v = vp8_rac_get_uint(c, 7) << 1;
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    return v + !v;
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}
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static av_always_inline
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445510
int vp56_rac_get_tree(VP56RangeCoder *c,
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                      const VP56Tree *tree,
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                      const uint8_t *probs)
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{
385
1764929
    while (tree->val > 0) {
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1319419
        if (vp56_rac_get_prob_branchy(c, probs[tree->prob_idx]))
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450669
            tree += tree->val;
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        else
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868750
            tree++;
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    }
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445510
    return -tree->val;
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}
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// how probabilities are associated with decisions is different I think
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// well, the new scheme fits in the old but this way has one fewer branches per decision
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4225958
static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
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                                   const uint8_t *probs)
398
{
399
4225958
    int i = 0;
400
401
    do {
402
9419020
        i = tree[i][vp56_rac_get_prob(c, probs[i])];
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9419020
    } while (i > 0);
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4225958
    return -i;
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}
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// DCTextra
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43890
static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
410
{
411
43890
    int v = 0;
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413
    do {
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163810
        v = (v<<1) + vp56_rac_get_prob(c, *prob++);
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163810
    } while (*prob);
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43890
    return v;
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}
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#endif /* AVCODEC_VP56_H */