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 (*op_pixels_func)(uint8_t *block /*align width (8 or 16)*/,
39 const uint8_t *pixels /*align 1*/,
40 ptrdiff_t line_size, int h);
43 * Half-pel DSP context.
45 typedef struct HpelDSPContext {
47 * Halfpel motion compensation with rounding (a+b+1)>>1.
48 * this is an array[4][4] of motion compensation functions for 4
49 * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
50 * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
51 * @param block destination where the result is stored
52 * @param pixels source
53 * @param line_size number of bytes in a horizontal line of block
56 op_pixels_func put_pixels_tab[4][4];
59 * Halfpel motion compensation with rounding (a+b+1)>>1.
60 * This is an array[4][4] of motion compensation functions for 4
61 * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
62 * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
63 * @param block destination into which the result is averaged (a+b+1)>>1
64 * @param pixels source
65 * @param line_size number of bytes in a horizontal line of block
68 op_pixels_func avg_pixels_tab[4][4];
71 * Halfpel motion compensation with no rounding (a+b)>>1.
72 * this is an array[4][4] of motion compensation functions for 2
73 * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
74 * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
75 * @param block destination where the result is stored
76 * @param pixels source
77 * @param line_size number of bytes in a horizontal line of block
79 * @note The size is kept at [4][4] to match the above pixel_tabs and avoid
80 * out of bounds reads in the motion estimation code.
82 op_pixels_func put_no_rnd_pixels_tab[4][4];
85 * Halfpel motion compensation with no rounding (a+b)>>1.
86 * this is an array[4] of motion compensation functions for 1
87 * horizontal blocksize (16) and the 4 halfpel positions<br>
88 * *pixels_tab[0][ xhalfpel + 2*yhalfpel ]
89 * @param block destination into which the result is averaged (a+b)>>1
90 * @param pixels source
91 * @param line_size number of bytes in a horizontal line of block
94 op_pixels_func avg_no_rnd_pixels_tab[4];
97 void ff_hpeldsp_init(HpelDSPContext *c, int flags);
99 void ff_hpeldsp_init_aarch64(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_ppc(HpelDSPContext *c, int flags);
103 void ff_hpeldsp_init_x86(HpelDSPContext *c, int flags);
104 void ff_hpeldsp_init_mips(HpelDSPContext *c, int flags);
106 #endif /* AVCODEC_HPELDSP_H */