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/**
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 * VP8 compatible video decoder
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 *
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 * Copyright (C) 2010 David Conrad
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 * Copyright (C) 2010 Ronald S. Bultje
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 * Copyright (C) 2010 Jason Garrett-Glaser
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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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#ifndef AVCODEC_VP8_H
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#define AVCODEC_VP8_H
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#include "vp56.h"
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#include "vp56data.h"
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#include "vp8dsp.h"
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#include "h264pred.h"
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#define VP8_MAX_QUANT 127
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enum dct_token {
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    DCT_0,
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    DCT_1,
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    DCT_2,
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    DCT_3,
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    DCT_4,
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    DCT_CAT1,
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    DCT_CAT2,
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    DCT_CAT3,
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    DCT_CAT4,
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    DCT_CAT5,
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    DCT_CAT6,
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    DCT_EOB,
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    NUM_DCT_TOKENS
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};
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// used to signal 4x4 intra pred in luma MBs
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#define MODE_I4x4 4
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enum inter_mvmode {
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    VP8_MVMODE_ZERO = MODE_I4x4 + 1,
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    VP8_MVMODE_MV,
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    VP8_MVMODE_SPLIT
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};
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enum inter_splitmvmode {
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    VP8_SPLITMVMODE_16x8 = 0,    ///< 2 16x8 blocks (vertical)
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    VP8_SPLITMVMODE_8x16,        ///< 2 8x16 blocks (horizontal)
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    VP8_SPLITMVMODE_8x8,         ///< 2x2 blocks of 8x8px each
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    VP8_SPLITMVMODE_4x4,         ///< 4x4 blocks of 4x4px each
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    VP8_SPLITMVMODE_NONE,        ///< (only used in prediction) no split MVs
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};
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typedef struct {
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    uint8_t filter_level;
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    uint8_t inner_limit;
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    uint8_t inner_filter;
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} VP8FilterStrength;
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typedef struct {
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    uint8_t skip;
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    // todo: make it possible to check for at least (i4x4 or split_mv)
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    // in one op. are others needed?
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    uint8_t mode;
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    uint8_t ref_frame;
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    uint8_t partitioning;
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    VP56mv mv;
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    VP56mv bmv[16];
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} VP8Macroblock;
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typedef struct {
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    AVCodecContext *avctx;
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    DSPContext dsp;
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    VP8DSPContext vp8dsp;
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    H264PredContext hpc;
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    vp8_mc_func put_pixels_tab[3][3][3];
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    AVFrame frames[4];
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    AVFrame *framep[4];
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    uint8_t *edge_emu_buffer;
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    VP56RangeCoder c;   ///< header context, includes mb modes and motion vectors
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    int profile;
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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 linesize;
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    int uvlinesize;
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    int keyframe;
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    int invisible;
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    int update_last;    ///< update VP56_FRAME_PREVIOUS with the current one
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    int update_golden;  ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
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    int update_altref;
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    int deblock_filter;
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    /**
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     * If this flag is not set, all the probability updates
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     * are discarded after this frame is decoded.
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     */
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    int update_probabilities;
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    /**
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     * All coefficients are contained in separate arith coding contexts.
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     * There can be 1, 2, 4, or 8 of these after the header context.
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     */
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    int num_coeff_partitions;
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    VP56RangeCoder coeff_partition[8];
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    VP8Macroblock *macroblocks;
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    VP8Macroblock *macroblocks_base;
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    VP8FilterStrength *filter_strength;
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    uint8_t *intra4x4_pred_mode_top;
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    uint8_t intra4x4_pred_mode_left[4];
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    uint8_t *segmentation_map;
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    /**
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     * Cache of the top row needed for intra prediction
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     * 16 for luma, 8 for each chroma plane
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     */
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    uint8_t (*top_border)[16+8+8];
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    /**
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     * For coeff decode, we need to know whether the above block had non-zero
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     * coefficients. This means for each macroblock, we need data for 4 luma
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     * blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
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     * per macroblock. We keep the last row in top_nnz.
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     */
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    uint8_t (*top_nnz)[9];
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    DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
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    /**
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     * This is the index plus one of the last non-zero coeff
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     * for each of the blocks in the current macroblock.
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     * So, 0 -> no coeffs
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     *     1 -> dc-only (special transform)
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     *     2+-> full transform
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     */
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    DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
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    DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16];
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    DECLARE_ALIGNED(16, DCTELEM, block_dc)[16];
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    uint8_t intra4x4_pred_mode_mb[16];
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    int chroma_pred_mode;    ///< 8x8c pred mode of the current macroblock
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    int segment;             ///< segment of the current macroblock
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    VP56mv mv_min;
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    VP56mv mv_max;
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    int mbskip_enabled;
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    int sign_bias[4]; ///< one state [0, 1] per ref frame type
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    int ref_count[3];
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    /**
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     * Base parameters for segmentation, i.e. per-macroblock parameters.
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     * These must be kept unchanged even if segmentation is not used for
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     * a frame, since the values persist between interframes.
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     */
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    struct {
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        int enabled;
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        int absolute_vals;
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        int update_map;
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        int8_t base_quant[4];
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        int8_t filter_level[4];     ///< base loop filter level
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    } segmentation;
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    /**
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     * Macroblocks can have one of 4 different quants in a frame when
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     * segmentation is enabled.
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     * If segmentation is disabled, only the first segment's values are used.
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     */
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    struct {
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        // [0] - DC qmul  [1] - AC qmul
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        int16_t luma_qmul[2];
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        int16_t luma_dc_qmul[2];    ///< luma dc-only block quant
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        int16_t chroma_qmul[2];
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    } qmat[4];
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    struct {
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        int simple;
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        int level;
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        int sharpness;
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    } filter;
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    struct {
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        int enabled;    ///< whether each mb can have a different strength based on mode/ref
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        /**
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         * filter strength adjustment for the following macroblock modes:
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         * [0-3] - i16x16 (always zero)
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         * [4]   - i4x4
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         * [5]   - zero mv
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         * [6]   - inter modes except for zero or split mv
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         * [7]   - split mv
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         *  i16x16 modes never have any adjustment
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         */
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        int8_t mode[VP8_MVMODE_SPLIT+1];
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        /**
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         * filter strength adjustment for macroblocks that reference:
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         * [0] - intra / VP56_FRAME_CURRENT
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         * [1] - VP56_FRAME_PREVIOUS
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         * [2] - VP56_FRAME_GOLDEN
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         * [3] - altref / VP56_FRAME_GOLDEN2
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         */
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        int8_t ref[4];
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    } lf_delta;
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    /**
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     * These are all of the updatable probabilities for binary decisions.
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     * They are only implictly reset on keyframes, making it quite likely
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     * for an interframe to desync if a prior frame's header was corrupt
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     * or missing outright!
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     */
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    struct {
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        uint8_t segmentid[3];
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        uint8_t mbskip;
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        uint8_t intra;
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        uint8_t last;
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        uint8_t golden;
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        uint8_t pred16x16[4];
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        uint8_t pred8x8c[3];
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        /* Padded to allow overreads */
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        uint8_t token[4][17][3][NUM_DCT_TOKENS-1];
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        uint8_t mvc[2][19];
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    } prob[2];
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} VP8Context;
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#endif