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102 lines
3.8 KiB
102 lines
3.8 KiB
/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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*/ |
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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_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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#endif /* AVCODEC_HPELDSP_H */
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