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Only the blocksizes 16 and 8 are implemented, yet the motion estimation code touches the blocksize 4 entries. But really nothing touches the blocksize 2 entries, so that we can reduce the put_no_rnd_pixels_tab array size to [3][4]. Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
108 lines
4.0 KiB
C
108 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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/**
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* Average and put pixel
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* Widths can be 16, 8, 4 or 2. For for widths 2 and 4, h is always a positive
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* multiple of 2; otherwise, it is a positive multiple of 4.
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*/
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typedef void (*op_pixels_func)(uint8_t *block /* align width */,
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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 (2,4,8,16) and the 4 halfpel positions<br>
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* *pixels_tab[ 0->16xH 1->8xH 2->4xH 3->2xH ][ 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 (2,4,8,16) and the 4 halfpel positions<br>
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* *pixels_tab[ 0->16xH 1->8xH 2->4xH 3->2xH ][ 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 [3][4] to avoid out of bounds accesses
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* in the motion estimation code.
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*/
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op_pixels_func put_no_rnd_pixels_tab[3][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[ 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_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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void ff_hpeldsp_init_loongarch(HpelDSPContext *c, int flags);
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#endif /* AVCODEC_HPELDSP_H */
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