libavcodec/vp8.h

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/*
 * VP8 compatible video decoder
 *
 * Copyright (C) 2010 David Conrad
 * Copyright (C) 2010 Ronald S. Bultje
 * Copyright (C) 2010 Jason Garrett-Glaser
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * 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.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * 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
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_VP8_H
#define AVCODEC_VP8_H

#include "vp56.h"
#include "vp56data.h"
#include "vp8dsp.h"
#include "h264pred.h"

#define VP8_MAX_QUANT 127

enum dct_token {
    DCT_0,
    DCT_1,
    DCT_2,
    DCT_3,
    DCT_4,
    DCT_CAT1,
    DCT_CAT2,
    DCT_CAT3,
    DCT_CAT4,
    DCT_CAT5,
    DCT_CAT6,
    DCT_EOB,

    NUM_DCT_TOKENS
};

// used to signal 4x4 intra pred in luma MBs
#define MODE_I4x4 4

enum inter_mvmode {
    VP8_MVMODE_ZERO = MODE_I4x4 + 1,
    VP8_MVMODE_MV,
    VP8_MVMODE_SPLIT
};

enum inter_splitmvmode {
    VP8_SPLITMVMODE_16x8 = 0,    
    VP8_SPLITMVMODE_8x16,        
    VP8_SPLITMVMODE_8x8,         
    VP8_SPLITMVMODE_4x4,         
    VP8_SPLITMVMODE_NONE,        
};

typedef struct {
    uint8_t filter_level;
    uint8_t inner_limit;
    uint8_t inner_filter;
} VP8FilterStrength;

typedef struct {
    uint8_t skip;
    // todo: make it possible to check for at least (i4x4 or split_mv)
    // in one op. are others needed?
    uint8_t mode;
    uint8_t ref_frame;
    uint8_t partitioning;
    VP56mv mv;
    VP56mv bmv[16];
} VP8Macroblock;

typedef struct {
    AVCodecContext *avctx;
    AVFrame *framep[4];
    AVFrame *next_framep[4];
    uint8_t *edge_emu_buffer;

    uint16_t mb_width;   /* number of horizontal MB */
    uint16_t mb_height;  /* number of vertical MB */
    int linesize;
    int uvlinesize;

    uint8_t keyframe;
    uint8_t deblock_filter;
    uint8_t mbskip_enabled;
    uint8_t segment;             
    uint8_t chroma_pred_mode;    
    uint8_t profile;
    VP56mv mv_min;
    VP56mv mv_max;

    int8_t sign_bias[4]; 
    int ref_count[3];

    struct {
        uint8_t enabled;
        uint8_t absolute_vals;
        uint8_t update_map;
        int8_t base_quant[4];
        int8_t filter_level[4];     
    } segmentation;

    struct {
        uint8_t simple;
        uint8_t level;
        uint8_t sharpness;
    } filter;

    VP8Macroblock *macroblocks;
    VP8FilterStrength *filter_strength;

    uint8_t *intra4x4_pred_mode_top;
    uint8_t intra4x4_pred_mode_left[4];

    struct {
        // [0] - DC qmul  [1] - AC qmul
        int16_t luma_qmul[2];
        int16_t luma_dc_qmul[2];    
        int16_t chroma_qmul[2];
    } qmat[4];

    struct {
        uint8_t enabled;    

        int8_t mode[VP8_MVMODE_SPLIT+1];

        int8_t ref[4];
    } lf_delta;

    uint8_t (*top_border)[16+8+8];

    uint8_t (*top_nnz)[9];
    DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];

    DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
    VP56RangeCoder c;   
    DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16];
    DECLARE_ALIGNED(16, DCTELEM, block_dc)[16];
    uint8_t intra4x4_pred_mode_mb[16];

    struct {
        uint8_t segmentid[3];
        uint8_t mbskip;
        uint8_t intra;
        uint8_t last;
        uint8_t golden;
        uint8_t pred16x16[4];
        uint8_t pred8x8c[3];
        uint8_t token[4][16][3][NUM_DCT_TOKENS-1];
        uint8_t mvc[2][19];
    } prob[2];

    VP8Macroblock *macroblocks_base;
    int invisible;
    int update_last;    
    int update_golden;  
    int update_altref;

    int update_probabilities;

    int num_coeff_partitions;
    VP56RangeCoder coeff_partition[8];
    DSPContext dsp;
    VP8DSPContext vp8dsp;
    H264PredContext hpc;
    vp8_mc_func put_pixels_tab[3][3][3];
    AVFrame frames[5];

    uint8_t *segmentation_maps[5];
    int num_maps_to_be_freed;
    int maps_are_invalid;
} VP8Context;

#endif /* AVCODEC_VP8_H */

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