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* commit '48b80f8393d418ad35d73f5a36f5011de1928f3c': hpeldsp: Explain why put_no_rnd_pixels_tab is larger than necessary Merged-by: Clément Bœsch <cboesch@gopro.com>
107 lines
4.0 KiB
C
107 lines
4.0 KiB
C
/*
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* Half-pel DSP functions.
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Half-pel DSP functions.
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*/
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#ifndef AVCODEC_HPELDSP_H
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#define AVCODEC_HPELDSP_H
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#include <stdint.h>
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#include <stddef.h>
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/* add and put pixel (decoding) */
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// blocksizes for hpel_pixels_func are 8x4,8x8 16x8 16x16
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// h for hpel_pixels_func is limited to {width/2, width} but never larger
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// than 16 and never smaller than 4
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typedef void (*op_pixels_func)(uint8_t *block /*align width (8 or 16)*/,
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const uint8_t *pixels /*align 1*/,
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ptrdiff_t line_size, int h);
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/**
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* Half-pel DSP context.
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*/
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typedef struct HpelDSPContext {
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/**
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* Halfpel motion compensation with rounding (a+b+1)>>1.
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* this is an array[4][4] of motion compensation functions for 4
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* horizontal blocksizes (8,16) and the 4 halfpel positions<br>
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* *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
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* @param block destination where the result is stored
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* @param pixels source
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* @param line_size number of bytes in a horizontal line of block
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* @param h height
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*/
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op_pixels_func put_pixels_tab[4][4];
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/**
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* Halfpel motion compensation with rounding (a+b+1)>>1.
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* This is an array[4][4] of motion compensation functions for 4
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* horizontal blocksizes (8,16) and the 4 halfpel positions<br>
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* *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
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* @param block destination into which the result is averaged (a+b+1)>>1
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* @param pixels source
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* @param line_size number of bytes in a horizontal line of block
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* @param h height
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*/
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op_pixels_func avg_pixels_tab[4][4];
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/**
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* Halfpel motion compensation with no rounding (a+b)>>1.
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* this is an array[4][4] of motion compensation functions for 2
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* horizontal blocksizes (8,16) and the 4 halfpel positions<br>
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* *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
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* @param block destination where the result is stored
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* @param pixels source
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* @param line_size number of bytes in a horizontal line of block
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* @param h height
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* @note The size is kept at [4][4] to match the above pixel_tabs and avoid
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* out of bounds reads in the motion estimation code.
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*/
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op_pixels_func put_no_rnd_pixels_tab[4][4];
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/**
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* Halfpel motion compensation with no rounding (a+b)>>1.
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* this is an array[4] of motion compensation functions for 1
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* horizontal blocksize (16) and the 4 halfpel positions<br>
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* *pixels_tab[0][ xhalfpel + 2*yhalfpel ]
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* @param block destination into which the result is averaged (a+b)>>1
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* @param pixels source
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* @param line_size number of bytes in a horizontal line of block
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* @param h height
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*/
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op_pixels_func avg_no_rnd_pixels_tab[4];
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} HpelDSPContext;
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void ff_hpeldsp_init(HpelDSPContext *c, int flags);
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void ff_hpeldsp_init_aarch64(HpelDSPContext *c, int flags);
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void ff_hpeldsp_init_alpha(HpelDSPContext *c, int flags);
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void ff_hpeldsp_init_arm(HpelDSPContext *c, int flags);
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void ff_hpeldsp_init_ppc(HpelDSPContext *c, int flags);
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void ff_hpeldsp_init_x86(HpelDSPContext *c, int flags);
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void ff_hpeldsp_init_mips(HpelDSPContext *c, int flags);
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#endif /* AVCODEC_HPELDSP_H */
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