| /* |
| * 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 |
| * @note The size is kept at [4][4] to match the above pixel_tabs and avoid |
| * out of bounds reads in the motion estimation code. |
| */ |
| 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_ppc(HpelDSPContext *c, int flags); |
| void ff_hpeldsp_init_x86(HpelDSPContext *c, int flags); |
| void ff_hpeldsp_init_mips(HpelDSPContext *c, int flags); |
| |
| #endif /* AVCODEC_HPELDSP_H */ |