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1 | /* |
2 | * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * FFmpeg is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with FFmpeg; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <math.h> | |
22 | #include <stdint.h> | |
23 | ||
24 | #include "libavutil/common.h" | |
25 | #include "internal.h" | |
26 | ||
27 | #if defined(CONFIG_RESAMPLE_DBL) | |
28 | #define SET_TYPE(func) func ## _dbl | |
29 | #define FELEM double | |
30 | #define FELEM2 double | |
31 | #define FELEML double | |
32 | #define OUT(d, v) d = v | |
33 | #define DBL_TO_FELEM(d, v) d = v | |
34 | #elif defined(CONFIG_RESAMPLE_FLT) | |
35 | #define SET_TYPE(func) func ## _flt | |
36 | #define FELEM float | |
37 | #define FELEM2 float | |
38 | #define FELEML float | |
39 | #define OUT(d, v) d = v | |
40 | #define DBL_TO_FELEM(d, v) d = v | |
41 | #elif defined(CONFIG_RESAMPLE_S32) | |
42 | #define SET_TYPE(func) func ## _s32 | |
43 | #define FELEM int32_t | |
44 | #define FELEM2 int64_t | |
45 | #define FELEML int64_t | |
46 | #define OUT(d, v) d = av_clipl_int32((v + (1 << 29)) >> 30) | |
47 | #define DBL_TO_FELEM(d, v) d = av_clipl_int32(llrint(v * (1 << 30))); | |
48 | #else | |
49 | #define SET_TYPE(func) func ## _s16 | |
50 | #define FELEM int16_t | |
51 | #define FELEM2 int32_t | |
52 | #define FELEML int64_t | |
53 | #define OUT(d, v) d = av_clip_int16((v + (1 << 14)) >> 15) | |
54 | #define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15))) | |
55 | #endif | |
56 | ||
57 | static void SET_TYPE(resample_nearest)(void *dst0, int dst_index, const void *src0, unsigned int index) | |
58 | { | |
59 | FELEM *dst = dst0; | |
60 | const FELEM *src = src0; | |
61 | dst[dst_index] = src[index]; | |
62 | } | |
63 | ||
64 | static void SET_TYPE(resample_linear)(ResampleContext *c, void *dst0, int dst_index, | |
65 | const void *src0, unsigned int index, int frac) | |
66 | { | |
67 | FELEM *dst = dst0; | |
68 | const FELEM *src = src0; | |
69 | int i; | |
70 | unsigned int sample_index = index >> c->phase_shift; | |
71 | FELEM2 val = 0; | |
72 | FELEM *filter = ((FELEM *)c->filter_bank) + | |
73 | c->filter_length * (index & c->phase_mask); | |
74 | FELEM2 v2 = 0; | |
75 | ||
76 | for (i = 0; i < c->filter_length; i++) { | |
77 | val += src[sample_index + i] * (FELEM2)filter[i]; | |
78 | v2 += src[sample_index + i] * (FELEM2)filter[i + c->filter_length]; | |
79 | } | |
80 | val += (v2 - val) * (FELEML)frac / c->src_incr; | |
81 | ||
82 | OUT(dst[dst_index], val); | |
83 | } | |
84 | ||
85 | static void SET_TYPE(resample_one)(ResampleContext *c, | |
86 | void *dst0, int dst_index, const void *src0, | |
87 | unsigned int index, int frac) | |
88 | { | |
89 | FELEM *dst = dst0; | |
90 | const FELEM *src = src0; | |
91 | int i; | |
92 | unsigned int sample_index = index >> c->phase_shift; | |
93 | FELEM2 val = 0; | |
94 | FELEM *filter = ((FELEM *)c->filter_bank) + | |
95 | c->filter_length * (index & c->phase_mask); | |
96 | ||
97 | for (i = 0; i < c->filter_length; i++) | |
98 | val += src[sample_index + i] * (FELEM2)filter[i]; | |
99 | ||
100 | OUT(dst[dst_index], val); | |
101 | } | |
102 | ||
103 | static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase, | |
104 | int tap_count) | |
105 | { | |
106 | int i; | |
107 | FELEM *filter = ((FELEM *)filter0) + phase * tap_count; | |
108 | for (i = 0; i < tap_count; i++) { | |
109 | DBL_TO_FELEM(filter[i], tab[i]); | |
110 | } | |
111 | } | |
112 | ||
113 | #undef SET_TYPE | |
114 | #undef FELEM | |
115 | #undef FELEM2 | |
116 | #undef FELEML | |
117 | #undef OUT | |
118 | #undef DBL_TO_FELEM |