2 * Half-pel DSP functions.
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * Half-pel DSP functions.
28 #ifndef AVCODEC_HPELDSP_H
29 #define AVCODEC_HPELDSP_H
34 /* add and put pixel (decoding) */
35 // blocksizes for hpel_pixels_func are 8x4,8x8 16x8 16x16
36 // h for hpel_pixels_func is limited to {width/2, width} but never larger
37 // than 16 and never smaller than 4
38 typedef void (*hpel_pixels_func)(uint8_t *block /*align width (8 or 16)*/,
39 const uint8_t *pixels /*align 1*/,
40 ptrdiff_t line_size, int h);
41 typedef void (*op_pixels_func)(uint8_t *block /*align width (8 or 16)*/,
42 const uint8_t *pixels /*align 1*/,
43 ptrdiff_t line_size, int h);
46 * Half-pel DSP context.
48 typedef struct HpelDSPContext {
50 * Halfpel motion compensation with rounding (a+b+1)>>1.
51 * this is an array[4][4] of motion compensation functions for 4
52 * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
53 * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
54 * @param block destination where the result is stored
55 * @param pixels source
56 * @param line_size number of bytes in a horizontal line of block
59 hpel_pixels_func put_pixels_tab[4][4];
62 * Halfpel motion compensation with rounding (a+b+1)>>1.
63 * This is an array[4][4] of motion compensation functions for 4
64 * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
65 * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
66 * @param block destination into which the result is averaged (a+b+1)>>1
67 * @param pixels source
68 * @param line_size number of bytes in a horizontal line of block
71 hpel_pixels_func avg_pixels_tab[4][4];
74 * Halfpel motion compensation with no rounding (a+b)>>1.
75 * this is an array[4][4] of motion compensation functions for 2
76 * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
77 * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
78 * @param block destination where the result is stored
79 * @param pixels source
80 * @param line_size number of bytes in a horizontal line of block
83 hpel_pixels_func put_no_rnd_pixels_tab[4][4];
86 * Halfpel motion compensation with no rounding (a+b)>>1.
87 * this is an array[4] of motion compensation functions for 1
88 * horizontal blocksize (16) and the 4 halfpel positions<br>
89 * *pixels_tab[0][ xhalfpel + 2*yhalfpel ]
90 * @param block destination into which the result is averaged (a+b)>>1
91 * @param pixels source
92 * @param line_size number of bytes in a horizontal line of block
95 hpel_pixels_func avg_no_rnd_pixels_tab[4];
98 void ff_hpeldsp_init(HpelDSPContext *c, int flags);
100 void ff_hpeldsp_init_alpha(HpelDSPContext *c, int flags);
101 void ff_hpeldsp_init_arm(HpelDSPContext *c, int flags);
102 void ff_hpeldsp_init_bfin(HpelDSPContext *c, int flags);
103 void ff_hpeldsp_init_ppc(HpelDSPContext *c, int flags);
104 void ff_hpeldsp_init_sh4(HpelDSPContext *c, int flags);
105 void ff_hpeldsp_init_vis(HpelDSPContext *c, int flags);
106 void ff_hpeldsp_init_x86(HpelDSPContext *c, int flags);
108 #endif /* AVCODEC_HPELDSP_H */