1 /*
2  * Copyright (c) 2016, Alliance for Open Media. All rights reserved
3  *
4  * This source code is subject to the terms of the BSD 2 Clause License and
5  * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6  * was not distributed with this source code in the LICENSE file, you can
7  * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8  * Media Patent License 1.0 was not distributed with this source code in the
9  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10  */
11 
12 #ifndef AOM_AOM_DSP_AOM_FILTER_H_
13 #define AOM_AOM_DSP_AOM_FILTER_H_
14 
15 #include "aom/aom_integer.h"
16 
17 #ifdef __cplusplus
18 extern "C" {
19 #endif
20 
21 #define FILTER_BITS 7
22 
23 #define SUBPEL_BITS 4
24 #define SUBPEL_MASK ((1 << SUBPEL_BITS) - 1)
25 #define SUBPEL_SHIFTS (1 << SUBPEL_BITS)
26 #define SUBPEL_TAPS 8
27 
28 #define SCALE_SUBPEL_BITS 10
29 #define SCALE_SUBPEL_SHIFTS (1 << SCALE_SUBPEL_BITS)
30 #define SCALE_SUBPEL_MASK (SCALE_SUBPEL_SHIFTS - 1)
31 #define SCALE_EXTRA_BITS (SCALE_SUBPEL_BITS - SUBPEL_BITS)
32 #define SCALE_EXTRA_OFF ((1 << SCALE_EXTRA_BITS) / 2)
33 
34 #define RS_SUBPEL_BITS 6
35 #define RS_SUBPEL_MASK ((1 << RS_SUBPEL_BITS) - 1)
36 #define RS_SCALE_SUBPEL_BITS 14
37 #define RS_SCALE_SUBPEL_MASK ((1 << RS_SCALE_SUBPEL_BITS) - 1)
38 #define RS_SCALE_EXTRA_BITS (RS_SCALE_SUBPEL_BITS - RS_SUBPEL_BITS)
39 #define RS_SCALE_EXTRA_OFF (1 << (RS_SCALE_EXTRA_BITS - 1))
40 
41 typedef int16_t InterpKernel[SUBPEL_TAPS];
42 
43 #define BIL_SUBPEL_BITS 3
44 #define BIL_SUBPEL_SHIFTS (1 << BIL_SUBPEL_BITS)
45 
46 // 2 tap bilinear filters
47 static const uint8_t bilinear_filters_2t[BIL_SUBPEL_SHIFTS][2] = {
48   { 128, 0 }, { 112, 16 }, { 96, 32 }, { 80, 48 },
49   { 64, 64 }, { 48, 80 },  { 32, 96 }, { 16, 112 },
50 };
51 
52 #ifdef __cplusplus
53 }  // extern "C"
54 #endif
55 
56 #endif  // AOM_AOM_DSP_AOM_FILTER_H_
57