/* * 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 */