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/*
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 * RV30/40 decoder common data declarations
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 * Copyright (c) 2007 Mike Melanson, Konstantin Shishkov
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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 libavcodec/rv34.h
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 * RV30 and RV40 decoder common data declarations
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 */
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#ifndef AVCODEC_RV34_H
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#define AVCODEC_RV34_H
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "h264pred.h"
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#define MB_TYPE_SEPARATE_DC 0x01000000
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#define IS_SEPARATE_DC(a)   ((a) & MB_TYPE_SEPARATE_DC)
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/**
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 * RV30 and RV40 Macroblock types
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 */
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enum RV40BlockTypes{
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    RV34_MB_TYPE_INTRA,      ///< Intra macroblock
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    RV34_MB_TYPE_INTRA16x16, ///< Intra macroblock with DCs in a separate 4x4 block
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    RV34_MB_P_16x16,         ///< P-frame macroblock, one motion frame
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    RV34_MB_P_8x8,           ///< P-frame macroblock, 8x8 motion compensation partitions
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    RV34_MB_B_FORWARD,       ///< B-frame macroblock, forward prediction
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    RV34_MB_B_BACKWARD,      ///< B-frame macroblock, backward prediction
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    RV34_MB_SKIP,            ///< Skipped block
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    RV34_MB_B_DIRECT,        ///< Bidirectionally predicted B-frame macroblock, no motion vectors
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    RV34_MB_P_16x8,          ///< P-frame macroblock, 16x8 motion compensation partitions
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    RV34_MB_P_8x16,          ///< P-frame macroblock, 8x16 motion compensation partitions
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    RV34_MB_B_BIDIR,         ///< Bidirectionally predicted B-frame macroblock, two motion vectors
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    RV34_MB_P_MIX16x16,      ///< P-frame macroblock with DCs in a separate 4x4 block, one motion vector
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    RV34_MB_TYPES
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};
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/**
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 * VLC tables used by the decoder
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 *
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 * Intra frame VLC sets do not contain some of those tables.
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 */
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typedef struct RV34VLC{
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    VLC cbppattern[2];     ///< VLCs used for pattern of coded block patterns decoding
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    VLC cbp[2][4];         ///< VLCs used for coded block patterns decoding
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    VLC first_pattern[4];  ///< VLCs used for decoding coefficients in the first subblock
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    VLC second_pattern[2]; ///< VLCs used for decoding coefficients in the subblocks 2 and 3
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    VLC third_pattern[2];  ///< VLCs used for decoding coefficients in the last subblock
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    VLC coefficient;       ///< VLCs used for decoding big coefficients
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}RV34VLC;
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/** essential slice information */
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typedef struct SliceInfo{
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    int type;              ///< slice type (intra, inter)
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    int quant;             ///< quantizer used for this slice
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    int vlc_set;           ///< VLCs used for this slice
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    int start, end;        ///< start and end macroblocks of the slice
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    int width;             ///< coded width
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    int height;            ///< coded height
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    int pts;               ///< frame timestamp
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}SliceInfo;
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/** decoder context */
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typedef struct RV34DecContext{
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    MpegEncContext s;
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    int8_t *intra_types_hist;///< old block types, used for prediction
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    int8_t *intra_types;     ///< block types
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    int    intra_types_stride;///< block types array stride
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    const uint8_t *luma_dc_quant_i;///< luma subblock DC quantizer for intraframes
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    const uint8_t *luma_dc_quant_p;///< luma subblock DC quantizer for interframes
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    RV34VLC *cur_vlcs;       ///< VLC set used for current frame decoding
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    int bits;                ///< slice size in bits
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    H264PredContext h;       ///< functions for 4x4 and 16x16 intra block prediction
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    SliceInfo si;            ///< current slice information
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    int *mb_type;            ///< internal macroblock types
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    int block_type;          ///< current block type
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    int luma_vlc;            ///< which VLC set will be used for decoding of luma blocks
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    int chroma_vlc;          ///< which VLC set will be used for decoding of chroma blocks
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    int is16;                ///< current block has additional 16x16 specific features or not
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    int dmv[4][2];           ///< differential motion vectors for the current macroblock
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    int rv30;                ///< indicates which RV variasnt is currently decoded
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    int rpr;                 ///< one field size in RV30 slice header
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    int cur_pts, last_pts, next_pts;
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    uint16_t *cbp_luma;      ///< CBP values for luma subblocks
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    uint8_t  *cbp_chroma;    ///< CBP values for chroma subblocks
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    int      *deblock_coefs; ///< deblock coefficients for each macroblock
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    /** 8x8 block available flags (for MV prediction) */
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    DECLARE_ALIGNED(8, uint32_t, avail_cache)[3*4];
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    int (*parse_slice_header)(struct RV34DecContext *r, GetBitContext *gb, SliceInfo *si);
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    int (*decode_mb_info)(struct RV34DecContext *r);
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    int (*decode_intra_types)(struct RV34DecContext *r, GetBitContext *gb, int8_t *dst);
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    void (*loop_filter)(struct RV34DecContext *r, int row);
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}RV34DecContext;
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/**
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 * common decoding functions
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 */
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int ff_rv34_get_start_offset(GetBitContext *gb, int blocks);
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int ff_rv34_decode_init(AVCodecContext *avctx);
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int ff_rv34_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt);
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int ff_rv34_decode_end(AVCodecContext *avctx);
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#endif /* AVCODEC_RV34_H */