/*
  * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
  * Copyright (c) 2006  Stefan Gehrer <stefan.gehrer@gmx.de>
  *
  * 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_CAVS_H
 #define AVCODEC_CAVS_H

 #include "cavsdsp.h"

 #include "blockdsp.h"

 #include "h264chroma.h"

 #include "idctdsp.h"

 #include "get_bits.h"
 #include "videodsp.h"

 
 #define SLICE_MAX_START_CODE    0x000001af
 #define EXT_START_CODE          0x000001b5
 #define USER_START_CODE         0x000001b2
 #define CAVS_START_CODE         0x000001b0
 #define PIC_I_START_CODE        0x000001b3
 #define PIC_PB_START_CODE       0x000001b6
 
 #define A_AVAIL                          1
 #define B_AVAIL                          2
 #define C_AVAIL                          4
 #define D_AVAIL                          8
 #define NOT_AVAIL                       -1
 #define REF_INTRA                       -2
 #define REF_DIR                         -3
 
 #define ESCAPE_CODE                     59
 
 #define FWD0                          0x01
 #define FWD1                          0x02
 #define BWD0                          0x04
 #define BWD1                          0x08
 #define SYM0                          0x10
 #define SYM1                          0x20
 #define SPLITH                        0x40
 #define SPLITV                        0x80
 
 #define MV_BWD_OFFS                     12
 #define MV_STRIDE                        4
 

 enum cavs_mb {

   I_8X8 = 0,
   P_SKIP,
   P_16X16,
   P_16X8,
   P_8X16,
   P_8X8,
   B_SKIP,
   B_DIRECT,
   B_FWD_16X16,
   B_BWD_16X16,
   B_SYM_16X16,
   B_8X8 = 29
 };
 

 enum cavs_sub_mb {

   B_SUB_DIRECT,
   B_SUB_FWD,
   B_SUB_BWD,
   B_SUB_SYM
 };
 

 enum cavs_intra_luma {

   INTRA_L_VERT,
   INTRA_L_HORIZ,
   INTRA_L_LP,
   INTRA_L_DOWN_LEFT,
   INTRA_L_DOWN_RIGHT,
   INTRA_L_LP_LEFT,
   INTRA_L_LP_TOP,
   INTRA_L_DC_128
 };
 

 enum cavs_intra_chroma {

   INTRA_C_LP,
   INTRA_C_HORIZ,
   INTRA_C_VERT,
   INTRA_C_PLANE,
   INTRA_C_LP_LEFT,
   INTRA_C_LP_TOP,
   INTRA_C_DC_128,
 };
 

 enum cavs_mv_pred {

   MV_PRED_MEDIAN,
   MV_PRED_LEFT,
   MV_PRED_TOP,
   MV_PRED_TOPRIGHT,
   MV_PRED_PSKIP,
   MV_PRED_BSKIP
 };
 

 enum cavs_block {

   BLK_16X16,
   BLK_16X8,
   BLK_8X16,
   BLK_8X8
 };
 

 enum cavs_mv_loc {

   MV_FWD_D3 = 0,
   MV_FWD_B2,
   MV_FWD_B3,
   MV_FWD_C2,
   MV_FWD_A1,
   MV_FWD_X0,
   MV_FWD_X1,
   MV_FWD_A3 = 8,
   MV_FWD_X2,
   MV_FWD_X3,
   MV_BWD_D3 = MV_BWD_OFFS,
   MV_BWD_B2,
   MV_BWD_B3,
   MV_BWD_C2,
   MV_BWD_A1,
   MV_BWD_X0,
   MV_BWD_X1,
   MV_BWD_A3 = MV_BWD_OFFS+8,
   MV_BWD_X2,
   MV_BWD_X3
 };
 

 DECLARE_ALIGNED(8, typedef, struct) {

     int16_t x;
     int16_t y;
     int16_t dist;
     int16_t ref;

 } cavs_vector;

 struct dec_2dvlc {

   int8_t rltab[59][3];
   int8_t level_add[27];
   int8_t golomb_order;
   int inc_limit;
   int8_t max_run;

 };

 typedef struct AVSFrame {
     AVFrame *f;
     int poc;
 } AVSFrame;
 

 typedef struct AVSContext {

     AVCodecContext *avctx;

     BlockDSPContext bdsp;

     H264ChromaContext h264chroma;

     IDCTDSPContext idsp;

     VideoDSPContext vdsp;
     CAVSDSPContext  cdsp;
     GetBitContext gb;
     AVSFrame cur;     ///< currently decoded frame
     AVSFrame DPB[2];  ///< reference frames

     int dist[2];     ///< temporal distances from current frame to ref frames

     int low_delay;

     int profile, level;
     int aspect_ratio;
     int mb_width, mb_height;

     int width, height;

     int stream_revision; ///<0 for samples from 2006, 1 for rm52j encoder

     int progressive;
     int pic_structure;
     int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
     int loop_filter_disable;
     int alpha_offset, beta_offset;
     int ref_flag;

     int mbx, mby, mbidx; ///< macroblock coordinates

     int flags;         ///< availability flags of neighbouring macroblocks
     int stc;           ///< last start code
     uint8_t *cy, *cu, *cv; ///< current MB sample pointers
     int left_qp;
     uint8_t *top_qp;
 
     /** mv motion vector cache
        0:    D3  B2  B3  C2
        4:    A1  X0  X1   -
        8:    A3  X2  X3   -
 
        X are the vectors in the current macroblock (5,6,9,10)
        A is the macroblock to the left (4,8)
        B is the macroblock to the top (1,2)
        C is the macroblock to the top-right (3)
        D is the macroblock to the top-left (0)
 
        the same is repeated for backward motion vectors */

     cavs_vector mv[2*4*3];
     cavs_vector *top_mv[2];
     cavs_vector *col_mv;

 
     /** luma pred mode cache
        0:    --  B2  B3
        3:    A1  X0  X1
        6:    A3  X2  X3   */
     int pred_mode_Y[3*3];
     int *top_pred_Y;

     ptrdiff_t l_stride, c_stride;

     int luma_scan[4];
     int qp;
     int qp_fixed;

     int pic_qp_fixed;

     int cbp;
     ScanTable scantable;
 
     /** intra prediction is done with un-deblocked samples
      they are saved here before deblocking the MB  */
     uint8_t *top_border_y, *top_border_u, *top_border_v;
     uint8_t left_border_y[26], left_border_u[10], left_border_v[10];
     uint8_t intern_border_y[26];
     uint8_t topleft_border_y, topleft_border_u, topleft_border_v;
 
     void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
     void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
     uint8_t *col_type_base;
 
     /* scaling factors for MV prediction */
     int sym_factor;    ///< for scaling in symmetrical B block
     int direct_den[2]; ///< for scaling in direct B block
     int scale_den[2];  ///< for scaling neighbouring MVs
 

     uint8_t *edge_emu_buffer;
 

     int got_keyframe;

     int16_t *block;

 } AVSContext;
 

 extern const uint8_t     ff_cavs_chroma_qp[64];

 extern const uint8_t     ff_cavs_partition_flags[30];

 extern const cavs_vector ff_cavs_intra_mv;
 extern const cavs_vector ff_cavs_dir_mv;

 static inline void set_mvs(cavs_vector *mv, enum cavs_block size) {

     switch(size) {
     case BLK_16X16:
         mv[MV_STRIDE  ] = mv[0];
         mv[MV_STRIDE+1] = mv[0];
     case BLK_16X8:
         mv[1] = mv[0];
         break;
     case BLK_8X16:
         mv[MV_STRIDE] = mv[0];
         break;
     }
 }
 

 void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type);

 void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left,
                                   int block);
 void ff_cavs_load_intra_pred_chroma(AVSContext *h);
 void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv);

 void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type);
 void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,
                 enum cavs_mv_pred mode, enum cavs_block size, int ref);

 void ff_cavs_init_mb(AVSContext *h);
 int  ff_cavs_next_mb(AVSContext *h);

 int ff_cavs_init_pic(AVSContext *h);

 void ff_cavs_init_top_lines(AVSContext *h);
 int ff_cavs_init(AVCodecContext *avctx);
 int ff_cavs_end (AVCodecContext *avctx);
 

 #endif /* AVCODEC_CAVS_H */