media/ffvpx/libavcodec/hpeldsp.h

   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      * @note The size is kept at [4][4] to match the above pixel_tabs and avoid
  80      *       out of bounds reads in the motion estimation code.
  81      */
  82     op_pixels_func put_no_rnd_pixels_tab[4][4];
  83
  84     /**
  85      * Halfpel motion compensation with no rounding (a+b)>>1.
  86      * this is an array[4] of motion compensation functions for 1
  87      * horizontal blocksize (16) and the 4 halfpel positions<br>
  88      * *pixels_tab[0][ xhalfpel + 2*yhalfpel ]
  89      * @param block destination into which the result is averaged (a+b)>>1
  90      * @param pixels source
  91      * @param line_size number of bytes in a horizontal line of block
  92      * @param h height
  93      */
  94     op_pixels_func avg_no_rnd_pixels_tab[4];
  95 } HpelDSPContext;
  96
  97 void ff_hpeldsp_init(HpelDSPContext *c, int flags);
  98
  99 void ff_hpeldsp_init_aarch64(HpelDSPContext *c, int flags);
 100 void ff_hpeldsp_init_alpha(HpelDSPContext *c, int flags);
 101 void ff_hpeldsp_init_arm(HpelDSPContext *c, int flags);
 102 void ff_hpeldsp_init_ppc(HpelDSPContext *c, int flags);
 103 void ff_hpeldsp_init_x86(HpelDSPContext *c, int flags);
 104 void ff_hpeldsp_init_mips(HpelDSPContext *c, int flags);
 105 void ff_hpeldsp_init_loongarch(HpelDSPContext *c, int flags);
 106
 107 #endif /* AVCODEC_HPELDSP_H */