/*
  * MPEG4 encoder/decoder internal header.
  * Copyright (c) 2000,2001 Fabrice Bellard
  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
  *
  * 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_MPEG4VIDEO_H
 #define AVCODEC_MPEG4VIDEO_H
 

 #include <stdint.h>
 #include "get_bits.h"
 #include "mpegvideo.h"
 #include "rl.h"
 

 // shapes
 #define RECT_SHAPE       0
 #define BIN_SHAPE        1
 #define BIN_ONLY_SHAPE   2
 #define GRAY_SHAPE       3
 
 #define SIMPLE_VO_TYPE             1
 #define CORE_VO_TYPE               3
 #define MAIN_VO_TYPE               4
 #define NBIT_VO_TYPE               5
 #define ARTS_VO_TYPE               10
 #define ACE_VO_TYPE                12
 #define ADV_SIMPLE_VO_TYPE         17
 
 // aspect_ratio_info
 #define EXTENDED_PAR 15
 
 //vol_sprite_usage / sprite_enable
 #define STATIC_SPRITE 1
 #define GMC_SPRITE 2
 
 #define MOTION_MARKER 0x1F001
 #define DC_MARKER     0x6B001
 
 #define VOS_STARTCODE        0x1B0
 #define USER_DATA_STARTCODE  0x1B2
 #define GOP_STARTCODE        0x1B3
 #define VISUAL_OBJ_STARTCODE 0x1B5
 #define VOP_STARTCODE        0x1B6
 
 /* dc encoding for mpeg4 */

 extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
 extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];

 extern const uint16_t ff_mpeg4_intra_vlc[103][2];
 extern RLTable ff_mpeg4_rl_intra;

 
 /* Note this is identical to the intra rvlc except that it is reordered. */
 extern RLTable rvlc_rl_inter;
 extern RLTable rvlc_rl_intra;
 
 extern const uint16_t sprite_trajectory_tab[15][2];
 extern const uint8_t mb_type_b_tab[4][2];
 
 /* these matrixes will be permuted for the idct */
 extern const int16_t ff_mpeg4_default_intra_matrix[64];
 extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
 
 extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
 extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
 extern const uint16_t ff_mpeg4_resync_prefix[8];
 
 extern const uint8_t mpeg4_dc_threshold[8];
 
 void mpeg4_encode_mb(MpegEncContext *s,
                     DCTELEM block[6][64],
                     int motion_x, int motion_y);
 void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
                    int dir);
 void ff_set_mpeg4_time(MpegEncContext * s);
 void mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
 
 int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb);
 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
 void ff_mpeg4_clean_buffers(MpegEncContext *s);
 void ff_mpeg4_stuffing(PutBitContext * pbc);
 void ff_mpeg4_init_partitions(MpegEncContext *s);
 void ff_mpeg4_merge_partitions(MpegEncContext *s);
 void ff_clean_mpeg4_qscales(MpegEncContext *s);
 int ff_mpeg4_decode_partitions(MpegEncContext *s);
 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
 int mpeg4_decode_video_packet_header(MpegEncContext *s);

 void ff_mpeg4_init_direct_mv(MpegEncContext *s);
 
 /**
  *
  * @return the mb_type
  */
 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);

 
 extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
 
 
 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
 #else
 #define IS_3IV1 0
 #endif
 
 
 /**
  * predicts the dc.
  * encoding quantized level -> quantized diff
  * decoding quantized diff -> quantized level
  * @param n block index (0-3 are luma, 4-5 are chroma)
  * @param dir_ptr pointer to an integer where the prediction direction will be stored
  */
 static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
 {
     int a, b, c, wrap, pred, scale, ret;
     int16_t *dc_val;
 
     /* find prediction */
     if (n < 4) {
         scale = s->y_dc_scale;
     } else {
         scale = s->c_dc_scale;
     }
     if(IS_3IV1)
         scale= 8;
 
     wrap= s->block_wrap[n];
     dc_val = s->dc_val[0] + s->block_index[n];
 
     /* B C
      * A X
      */
     a = dc_val[ - 1];
     b = dc_val[ - 1 - wrap];
     c = dc_val[ - wrap];
 
     /* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
     if(s->first_slice_line && n!=3){
         if(n!=2) b=c= 1024;
         if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024;
     }
     if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){
         if(n==0 || n==4 || n==5)
             b=1024;
     }
 
     if (abs(a - b) < abs(b - c)) {
         pred = c;
         *dir_ptr = 1; /* top */
     } else {
         pred = a;
         *dir_ptr = 0; /* left */
     }
     /* we assume pred is positive */
     pred = FASTDIV((pred + (scale >> 1)), scale);
 
     if(encoding){
         ret = level - pred;
     }else{
         level += pred;
         ret= level;
         if(s->error_recognition>=3){
             if(level<0){
                 av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
                 return -1;
             }
             if(level*scale > 2048 + scale){
                 av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
                 return -1;
             }
         }
     }
     level *=scale;
     if(level&(~2047)){
         if(level<0)
             level=0;
         else if(!(s->workaround_bugs&FF_BUG_DC_CLIP))
             level=2047;
     }
     dc_val[0]= level;
 
     return ret;
 }

 #endif /* AVCODEC_MPEG4VIDEO_H */