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/*
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 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
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 * Copyright (c) 2006  Stefan Gehrer <stefan.gehrer@gmx.de>
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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 FFMPEG_CAVS_H
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#define FFMPEG_CAVS_H
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#include "dsputil.h"
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#include "mpegvideo.h"
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#define SLICE_MIN_START_CODE    0x00000101
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#define SLICE_MAX_START_CODE    0x000001af
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#define EXT_START_CODE          0x000001b5
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#define USER_START_CODE         0x000001b2
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#define CAVS_START_CODE         0x000001b0
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#define PIC_I_START_CODE        0x000001b3
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#define PIC_PB_START_CODE       0x000001b6
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#define A_AVAIL                          1
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#define B_AVAIL                          2
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#define C_AVAIL                          4
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#define D_AVAIL                          8
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#define NOT_AVAIL                       -1
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#define REF_INTRA                       -2
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#define REF_DIR                         -3
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#define ESCAPE_CODE                     59
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#define FWD0                          0x01
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#define FWD1                          0x02
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#define BWD0                          0x04
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#define BWD1                          0x08
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#define SYM0                          0x10
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#define SYM1                          0x20
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#define SPLITH                        0x40
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#define SPLITV                        0x80
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#define MV_BWD_OFFS                     12
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#define MV_STRIDE                        4
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enum mb_t {
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  I_8X8 = 0,
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  P_SKIP,
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  P_16X16,
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  P_16X8,
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  P_8X16,
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  P_8X8,
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  B_SKIP,
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  B_DIRECT,
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  B_FWD_16X16,
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  B_BWD_16X16,
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  B_SYM_16X16,
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  B_8X8 = 29
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};
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enum sub_mb_t {
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  B_SUB_DIRECT,
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  B_SUB_FWD,
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  B_SUB_BWD,
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  B_SUB_SYM
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};
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enum intra_luma_t {
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  INTRA_L_VERT,
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  INTRA_L_HORIZ,
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  INTRA_L_LP,
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  INTRA_L_DOWN_LEFT,
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  INTRA_L_DOWN_RIGHT,
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  INTRA_L_LP_LEFT,
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  INTRA_L_LP_TOP,
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  INTRA_L_DC_128
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};
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enum intra_chroma_t {
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  INTRA_C_LP,
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  INTRA_C_HORIZ,
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  INTRA_C_VERT,
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  INTRA_C_PLANE,
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  INTRA_C_LP_LEFT,
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  INTRA_C_LP_TOP,
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  INTRA_C_DC_128,
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};
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enum mv_pred_t {
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  MV_PRED_MEDIAN,
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  MV_PRED_LEFT,
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  MV_PRED_TOP,
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  MV_PRED_TOPRIGHT,
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  MV_PRED_PSKIP,
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  MV_PRED_BSKIP
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};
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enum block_t {
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  BLK_16X16,
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  BLK_16X8,
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  BLK_8X16,
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  BLK_8X8
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};
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enum mv_loc_t {
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  MV_FWD_D3 = 0,
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  MV_FWD_B2,
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  MV_FWD_B3,
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  MV_FWD_C2,
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  MV_FWD_A1,
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  MV_FWD_X0,
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  MV_FWD_X1,
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  MV_FWD_A3 = 8,
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  MV_FWD_X2,
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  MV_FWD_X3,
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  MV_BWD_D3 = MV_BWD_OFFS,
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  MV_BWD_B2,
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  MV_BWD_B3,
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  MV_BWD_C2,
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  MV_BWD_A1,
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  MV_BWD_X0,
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  MV_BWD_X1,
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  MV_BWD_A3 = MV_BWD_OFFS+8,
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  MV_BWD_X2,
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  MV_BWD_X3
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};
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DECLARE_ALIGNED_8(typedef, struct) {
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    int16_t x;
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    int16_t y;
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    int16_t dist;
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    int16_t ref;
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} vector_t;
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typedef struct dec_2dvlc_t {
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  int8_t rltab[59][3];
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  int8_t level_add[27];
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  int8_t golomb_order;
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  int inc_limit;
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  int8_t max_run;
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} dec_2dvlc_t;
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typedef struct {
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    MpegEncContext s;
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    Picture picture; ///< currently decoded frame
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    Picture DPB[2];  ///< reference frames
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    int dist[2];     ///< temporal distances from current frame to ref frames
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    int profile, level;
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    int aspect_ratio;
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    int mb_width, mb_height;
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    int pic_type;
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    int progressive;
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    int pic_structure;
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    int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
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    int loop_filter_disable;
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    int alpha_offset, beta_offset;
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    int ref_flag;
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    int mbx, mby;      ///< macroblock coordinates
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    int flags;         ///< availability flags of neighbouring macroblocks
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    int stc;           ///< last start code
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    uint8_t *cy, *cu, *cv; ///< current MB sample pointers
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    int left_qp;
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    uint8_t *top_qp;
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    /** mv motion vector cache
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       0:    D3  B2  B3  C2
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       4:    A1  X0  X1   -
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       8:    A3  X2  X3   -
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       X are the vectors in the current macroblock (5,6,9,10)
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       A is the macroblock to the left (4,8)
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       B is the macroblock to the top (1,2)
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       C is the macroblock to the top-right (3)
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       D is the macroblock to the top-left (0)
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       the same is repeated for backward motion vectors */
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    vector_t mv[2*4*3];
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    vector_t *top_mv[2];
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    vector_t *col_mv;
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    /** luma pred mode cache
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       0:    --  B2  B3
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       3:    A1  X0  X1
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       6:    A3  X2  X3   */
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    int pred_mode_Y[3*3];
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    int *top_pred_Y;
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    int l_stride, c_stride;
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    int luma_scan[4];
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    int qp;
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    int qp_fixed;
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    int cbp;
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    ScanTable scantable;
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    /** intra prediction is done with un-deblocked samples
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     they are saved here before deblocking the MB  */
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    uint8_t *top_border_y, *top_border_u, *top_border_v;
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    uint8_t left_border_y[26], left_border_u[10], left_border_v[10];
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    uint8_t intern_border_y[26];
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    uint8_t topleft_border_y, topleft_border_u, topleft_border_v;
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    void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
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    void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
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    uint8_t *col_type_base;
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    uint8_t *col_type;
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    /* scaling factors for MV prediction */
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    int sym_factor;    ///< for scaling in symmetrical B block
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    int direct_den[2]; ///< for scaling in direct B block
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    int scale_den[2];  ///< for scaling neighbouring MVs
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    int got_keyframe;
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    DCTELEM *block;
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} AVSContext;
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extern const uint8_t     ff_cavs_dequant_shift[64];
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extern const uint16_t    ff_cavs_dequant_mul[64];
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extern const dec_2dvlc_t ff_cavs_intra_dec[7];
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extern const dec_2dvlc_t ff_cavs_inter_dec[7];
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extern const dec_2dvlc_t ff_cavs_chroma_dec[5];
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extern const uint8_t     ff_cavs_chroma_qp[64];
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extern const uint8_t     ff_cavs_scan3x3[4];
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extern const uint8_t     ff_cavs_partition_flags[30];
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extern const int_fast8_t ff_left_modifier_l[8];
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extern const int_fast8_t ff_top_modifier_l[8];
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extern const int_fast8_t ff_left_modifier_c[7];
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extern const int_fast8_t ff_top_modifier_c[7];
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extern const vector_t ff_cavs_intra_mv;
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extern const vector_t ff_cavs_un_mv;
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extern const vector_t ff_cavs_dir_mv;
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static inline void modify_pred(const int_fast8_t *mod_table, int *mode) {
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    *mode = mod_table[*mode];
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    if(*mode < 0) {
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        av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n");
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        *mode = 0;
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    }
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}
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static inline void set_intra_mode_default(AVSContext *h) {
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    h->pred_mode_Y[3] =  h->pred_mode_Y[6] = INTRA_L_LP;
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    h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP;
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}
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static inline void set_mvs(vector_t *mv, enum block_t size) {
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    switch(size) {
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    case BLK_16X16:
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        mv[MV_STRIDE  ] = mv[0];
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        mv[MV_STRIDE+1] = mv[0];
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    case BLK_16X8:
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        mv[1] = mv[0];
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        break;
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    case BLK_8X16:
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        mv[MV_STRIDE] = mv[0];
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        break;
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    }
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}
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static inline void set_mv_intra(AVSContext *h) {
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    h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
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    set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
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    h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
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    set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
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    if(h->pic_type != FF_B_TYPE)
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        *h->col_type = I_8X8;
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}
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static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf,
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                          DCTELEM *dst, int mul, int shift, int coeff_num) {
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    int round = 1 << (shift - 1);
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    int pos = -1;
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    const uint8_t *scantab = h->scantable.permutated;
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    /* inverse scan and dequantization */
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    while(--coeff_num >= 0){
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        pos += run_buf[coeff_num];
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        if(pos > 63) {
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            av_log(h->s.avctx, AV_LOG_ERROR,
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                "position out of block bounds at pic %d MB(%d,%d)\n",
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                h->picture.poc, h->mbx, h->mby);
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            return -1;
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        }
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        dst[scantab[pos]] = (level_buf[coeff_num]*mul + round) >> shift;
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    }
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    return 0;
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}
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void ff_cavs_filter(AVSContext *h, enum mb_t mb_type);
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void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left,
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                                  int block);
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void ff_cavs_load_intra_pred_chroma(AVSContext *h);
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void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv);
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void ff_cavs_inter(AVSContext *h, enum mb_t mb_type);
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void ff_cavs_mv(AVSContext *h, enum mv_loc_t nP, enum mv_loc_t nC,
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                enum mv_pred_t mode, enum block_t size, int ref);
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void ff_cavs_init_mb(AVSContext *h);
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int  ff_cavs_next_mb(AVSContext *h);
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void ff_cavs_init_pic(AVSContext *h);
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void ff_cavs_init_top_lines(AVSContext *h);
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int ff_cavs_init(AVCodecContext *avctx);
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int ff_cavs_end (AVCodecContext *avctx);
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#endif /* FFMPEG_CAVS_H */