yading@10: /*
yading@10:  * Half-pel DSP functions.
yading@10:  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
yading@10:  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Half-pel DSP functions.
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_HPELDSP_H
yading@10: #define AVCODEC_HPELDSP_H
yading@10: 
yading@10: #include <stdint.h>
yading@10: #include <stddef.h>
yading@10: 
yading@10: /* add and put pixel (decoding) */
yading@10: // blocksizes for hpel_pixels_func are 8x4,8x8 16x8 16x16
yading@10: // h for hpel_pixels_func is limited to {width/2, width} but never larger
yading@10: // than 16 and never smaller than 4
yading@10: typedef void (*op_pixels_func)(uint8_t *block /*align width (8 or 16)*/,
yading@10:                                const uint8_t *pixels /*align 1*/,
yading@10:                                ptrdiff_t line_size, int h);
yading@10: 
yading@10: /**
yading@10:  * Half-pel DSP context.
yading@10:  */
yading@10: typedef struct HpelDSPContext {
yading@10:     /**
yading@10:      * Halfpel motion compensation with rounding (a+b+1)>>1.
yading@10:      * this is an array[4][4] of motion compensation functions for 4
yading@10:      * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
yading@10:      * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
yading@10:      * @param block destination where the result is stored
yading@10:      * @param pixels source
yading@10:      * @param line_size number of bytes in a horizontal line of block
yading@10:      * @param h height
yading@10:      */
yading@10:     op_pixels_func put_pixels_tab[4][4];
yading@10: 
yading@10:     /**
yading@10:      * Halfpel motion compensation with rounding (a+b+1)>>1.
yading@10:      * This is an array[4][4] of motion compensation functions for 4
yading@10:      * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
yading@10:      * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
yading@10:      * @param block destination into which the result is averaged (a+b+1)>>1
yading@10:      * @param pixels source
yading@10:      * @param line_size number of bytes in a horizontal line of block
yading@10:      * @param h height
yading@10:      */
yading@10:     op_pixels_func avg_pixels_tab[4][4];
yading@10: 
yading@10:     /**
yading@10:      * Halfpel motion compensation with no rounding (a+b)>>1.
yading@10:      * this is an array[4][4] of motion compensation functions for 2
yading@10:      * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
yading@10:      * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
yading@10:      * @param block destination where the result is stored
yading@10:      * @param pixels source
yading@10:      * @param line_size number of bytes in a horizontal line of block
yading@10:      * @param h height
yading@10:      */
yading@10:     op_pixels_func put_no_rnd_pixels_tab[4][4];
yading@10: 
yading@10:     /**
yading@10:      * Halfpel motion compensation with no rounding (a+b)>>1.
yading@10:      * this is an array[4] of motion compensation functions for 1
yading@10:      * horizontal blocksize (16) and the 4 halfpel positions<br>
yading@10:      * *pixels_tab[0][ xhalfpel + 2*yhalfpel ]
yading@10:      * @param block destination into which the result is averaged (a+b)>>1
yading@10:      * @param pixels source
yading@10:      * @param line_size number of bytes in a horizontal line of block
yading@10:      * @param h height
yading@10:      */
yading@10:     op_pixels_func avg_no_rnd_pixels_tab[4];
yading@10: } HpelDSPContext;
yading@10: 
yading@10: void ff_hpeldsp_init(HpelDSPContext *c, int flags);
yading@10: 
yading@10: void ff_hpeldsp_init_alpha(HpelDSPContext *c, int flags);
yading@10: void ff_hpeldsp_init_arm(HpelDSPContext *c, int flags);
yading@10: void ff_hpeldsp_init_bfin(HpelDSPContext *c, int flags);
yading@10: void ff_hpeldsp_init_ppc(HpelDSPContext *c, int flags);
yading@10: void ff_hpeldsp_init_sh4(HpelDSPContext *c, int flags);
yading@10: void ff_hpeldsp_init_vis(HpelDSPContext *c, int flags);
yading@10: void ff_hpeldsp_init_x86(HpelDSPContext *c, int flags);
yading@10: 
yading@10: #endif /* AVCODEC_HPELDSP_H */