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); 105 106 #endif /* AVCODEC_HPELDSP_H */ 107