/*
  * Half-pel DSP functions.
  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
  * Copyright (c) 2002-2004 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
  */
 
 /**
  * @file
  * Half-pel DSP functions.
  */
 
 #ifndef AVCODEC_HPELDSP_H
 #define AVCODEC_HPELDSP_H
 
 #include <stdint.h>
 #include <stddef.h>
 
 /* add and put pixel (decoding) */

 // blocksizes for hpel_pixels_func are 8x4,8x8 16x8 16x16
 // h for hpel_pixels_func is limited to {width/2, width} but never larger

 // than 16 and never smaller than 4

 typedef void (*op_pixels_func)(uint8_t *block /*align width (8 or 16)*/,
                                const uint8_t *pixels /*align 1*/,
                                ptrdiff_t line_size, int h);

 
 /**
  * Half-pel DSP context.
  */
 typedef struct HpelDSPContext {
     /**
      * Halfpel motion compensation with rounding (a+b+1)>>1.
      * this is an array[4][4] of motion compensation functions for 4
      * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
      * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
      * @param block destination where the result is stored
      * @param pixels source
      * @param line_size number of bytes in a horizontal line of block
      * @param h height
      */

     op_pixels_func put_pixels_tab[4][4];

 
     /**
      * Halfpel motion compensation with rounding (a+b+1)>>1.
      * This is an array[4][4] of motion compensation functions for 4
      * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
      * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
      * @param block destination into which the result is averaged (a+b+1)>>1
      * @param pixels source
      * @param line_size number of bytes in a horizontal line of block
      * @param h height
      */

     op_pixels_func avg_pixels_tab[4][4];

 
     /**
      * Halfpel motion compensation with no rounding (a+b)>>1.

      * this is an array[4][4] of motion compensation functions for 2

      * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
      * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
      * @param block destination where the result is stored
      * @param pixels source
      * @param line_size number of bytes in a horizontal line of block
      * @param h height
      */

     op_pixels_func put_no_rnd_pixels_tab[4][4];

 
     /**
      * Halfpel motion compensation with no rounding (a+b)>>1.
      * this is an array[4] of motion compensation functions for 1
      * horizontal blocksize (16) and the 4 halfpel positions<br>
      * *pixels_tab[0][ xhalfpel + 2*yhalfpel ]
      * @param block destination into which the result is averaged (a+b)>>1
      * @param pixels source
      * @param line_size number of bytes in a horizontal line of block
      * @param h height
      */

     op_pixels_func avg_no_rnd_pixels_tab[4];

 } HpelDSPContext;
 

 void ff_hpeldsp_init(HpelDSPContext *c, int flags);

 void ff_hpeldsp_init_aarch64(HpelDSPContext *c, int flags);

 void ff_hpeldsp_init_alpha(HpelDSPContext *c, int flags);

 void ff_hpeldsp_init_arm(HpelDSPContext *c, int flags);

 void ff_hpeldsp_init_bfin(HpelDSPContext *c, int flags);

 void ff_hpeldsp_init_ppc(HpelDSPContext *c, int flags);

 void ff_hpeldsp_init_vis(HpelDSPContext *c, int flags);

 void ff_hpeldsp_init_x86(HpelDSPContext *c, int flags);

 
 #endif /* AVCODEC_HPELDSP_H */