blob: 768139bfc96e248e3a2c2cc608375c6806c4e509
| 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 |