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  1. /*
  2.  * Half-pel DSP functions.
  3.  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
  4.  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. /**
  24.  * @file
  25.  * Half-pel DSP functions.
  26.  */
  27.  
  28. #ifndef AVCODEC_HPELDSP_H
  29. #define AVCODEC_HPELDSP_H
  30.  
  31. #include <stdint.h>
  32. #include <stddef.h>
  33.  
  34. /* add and put pixel (decoding) */
  35. // blocksizes for hpel_pixels_func are 8x4,8x8 16x8 16x16
  36. // h for hpel_pixels_func is limited to {width/2, width} but never larger
  37. // than 16 and never smaller than 4
  38. typedef void (*op_pixels_func)(uint8_t *block /*align width (8 or 16)*/,
  39.                                const uint8_t *pixels /*align 1*/,
  40.                                ptrdiff_t line_size, int h);
  41.  
  42. /**
  43.  * Half-pel DSP context.
  44.  */
  45. typedef struct HpelDSPContext {
  46.     /**
  47.      * Halfpel motion compensation with rounding (a+b+1)>>1.
  48.      * this is an array[4][4] of motion compensation functions for 4
  49.      * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
  50.      * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
  51.      * @param block destination where the result is stored
  52.      * @param pixels source
  53.      * @param line_size number of bytes in a horizontal line of block
  54.      * @param h height
  55.      */
  56.     op_pixels_func put_pixels_tab[4][4];
  57.  
  58.     /**
  59.      * Halfpel motion compensation with rounding (a+b+1)>>1.
  60.      * This is an array[4][4] of motion compensation functions for 4
  61.      * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
  62.      * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
  63.      * @param block destination into which the result is averaged (a+b+1)>>1
  64.      * @param pixels source
  65.      * @param line_size number of bytes in a horizontal line of block
  66.      * @param h height
  67.      */
  68.     op_pixels_func avg_pixels_tab[4][4];
  69.  
  70.     /**
  71.      * Halfpel motion compensation with no rounding (a+b)>>1.
  72.      * this is an array[4][4] of motion compensation functions for 2
  73.      * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
  74.      * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
  75.      * @param block destination where the result is stored
  76.      * @param pixels source
  77.      * @param line_size number of bytes in a horizontal line of block
  78.      * @param h height
  79.      */
  80.     op_pixels_func put_no_rnd_pixels_tab[4][4];
  81.  
  82.     /**
  83.      * Halfpel motion compensation with no rounding (a+b)>>1.
  84.      * this is an array[4] of motion compensation functions for 1
  85.      * horizontal blocksize (16) and the 4 halfpel positions<br>
  86.      * *pixels_tab[0][ xhalfpel + 2*yhalfpel ]
  87.      * @param block destination into which the result is averaged (a+b)>>1
  88.      * @param pixels source
  89.      * @param line_size number of bytes in a horizontal line of block
  90.      * @param h height
  91.      */
  92.     op_pixels_func avg_no_rnd_pixels_tab[4];
  93. } HpelDSPContext;
  94.  
  95. void ff_hpeldsp_init(HpelDSPContext *c, int flags);
  96.  
  97. void ff_hpeldsp_init_alpha(HpelDSPContext *c, int flags);
  98. void ff_hpeldsp_init_arm(HpelDSPContext *c, int flags);
  99. void ff_hpeldsp_init_bfin(HpelDSPContext *c, int flags);
  100. void ff_hpeldsp_init_ppc(HpelDSPContext *c, int flags);
  101. void ff_hpeldsp_init_vis(HpelDSPContext *c, int flags);
  102. void ff_hpeldsp_init_x86(HpelDSPContext *c, int flags);
  103.  
  104. #endif /* AVCODEC_HPELDSP_H */
  105.