/*

  * H.263 internal header

  *
  * 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_H263_H
 #define AVCODEC_H263_H
 

 #include <stdint.h>
 #include "libavutil/rational.h"
 #include "get_bits.h"
 #include "mpegvideo.h"

 #include "h263data.h"

 #include "rl.h"
 

 #define FF_ASPECT_EXTENDED 15

 #define INT_BIT (CHAR_BIT * sizeof(int))

 // The defines below define the number of bits that are read at once for
 // reading vlc values. Changing these may improve speed and data cache needs
 // be aware though that decreasing them may need the number of stages that is
 // passed to get_vlc* to be increased.
 #define INTRA_MCBPC_VLC_BITS 6
 #define INTER_MCBPC_VLC_BITS 7
 #define CBPY_VLC_BITS 6
 #define TEX_VLC_BITS 9
 

 #define H263_GOB_HEIGHT(h) ((h) <= 400 ? 1 : (h) <= 800 ? 2 : 4)
 

 extern VLC ff_h263_intra_MCBPC_vlc;
 extern VLC ff_h263_inter_MCBPC_vlc;
 extern VLC ff_h263_cbpy_vlc;

 extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[];
 

 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);

 av_const int ff_h263_aspect_to_info(AVRational aspect);

 int ff_h263_decode_init(AVCodecContext *avctx);
 int ff_h263_decode_frame(AVCodecContext *avctx,

                              void *data, int *got_frame,

                              AVPacket *avpkt);
 int ff_h263_decode_end(AVCodecContext *avctx);

 void ff_h263_encode_mb(MpegEncContext *s,

                        int16_t block[6][64],

                        int motion_x, int motion_y);
 void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
 void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
 int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
                              int *px, int *py);
 void ff_h263_encode_init(MpegEncContext *s);

 void ff_h263_decode_init_vlc(void);

 int ff_h263_decode_picture_header(MpegEncContext *s);

 int ff_h263_decode_gob_header(MpegEncContext *s);
 void ff_h263_update_motion_val(MpegEncContext * s);
 void ff_h263_loop_filter(MpegEncContext * s);
 int ff_h263_decode_mba(MpegEncContext *s);
 void ff_h263_encode_mba(MpegEncContext *s);
 void ff_init_qscale_tab(MpegEncContext *s);

 int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);

 void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);

 
 
 /**

  * Print picture info if FF_DEBUG_PICT_INFO is set.

  */
 void ff_h263_show_pict_info(MpegEncContext *s);
 
 int ff_intel_h263_decode_picture_header(MpegEncContext *s);
 int ff_h263_decode_mb(MpegEncContext *s,

                       int16_t block[6][64]);

 
 /**

  * Return the value of the 3-bit "source format" syntax element.

  * This represents some standard picture dimensions or indicates that

  * width&height are explicitly stored later.
  */
 int av_const h263_get_picture_format(int width, int height);
 
 void ff_clean_h263_qscales(MpegEncContext *s);
 int ff_h263_resync(MpegEncContext *s);

 void ff_h263_encode_motion(PutBitContext *pb, int val, int f_code);

 static inline int h263_get_motion_length(int val, int f_code){

     int l, bit_size, code;
 
     if (val == 0) {

         return ff_mvtab[0][1];

     } else {
         bit_size = f_code - 1;
         /* modulo encoding */
         l= INT_BIT - 6 - bit_size;
         val = (val<<l)>>l;
         val--;
         code = (val >> bit_size) + 1;
 

         return ff_mvtab[code][1] + 1 + bit_size;

     }
 }
 
 static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){

     if (s->avctx->flags2 & AV_CODEC_FLAG2_NO_OUTPUT) {

         skip_put_bits(&s->pb,

             h263_get_motion_length(x, f_code)
            +h263_get_motion_length(y, f_code));

     }else{

         ff_h263_encode_motion(&s->pb, x, f_code);
         ff_h263_encode_motion(&s->pb, y, f_code);

     }
 }
 
 static inline int get_p_cbp(MpegEncContext * s,

                       int16_t block[6][64],

                       int motion_x, int motion_y){
     int cbp, i;
 

     if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {

         int best_cbpy_score= INT_MAX;
         int best_cbpc_score= INT_MAX;
         int cbpc = (-1), cbpy= (-1);
         const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
         const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
 
         for(i=0; i<4; i++){

             int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;

             if(i&1) score += s->coded_score[5];
             if(i&2) score += s->coded_score[4];
 
             if(score < best_cbpc_score){
                 best_cbpc_score= score;
                 cbpc= i;
             }
         }
 
         for(i=0; i<16; i++){

             int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;

             if(i&1) score += s->coded_score[3];
             if(i&2) score += s->coded_score[2];
             if(i&4) score += s->coded_score[1];
             if(i&8) score += s->coded_score[0];
 
             if(score < best_cbpy_score){
                 best_cbpy_score= score;
                 cbpy= i;
             }
         }
         cbp= cbpc + 4*cbpy;
         if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
             if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
                 cbp= 0;
         }
 
         for (i = 0; i < 6; i++) {
             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
                 s->block_last_index[i]= -1;

                 s->bdsp.clear_block(s->block[i]);

             }
         }
     }else{
         cbp= 0;
         for (i = 0; i < 6; i++) {
             if (s->block_last_index[i] >= 0)
                 cbp |= 1 << (5 - i);
         }
     }
     return cbp;
 }
 

 #endif /* AVCODEC_H263_H */