lavr: Remove unused label
[libav.git] / libavresample / resample_template.c
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1/*
2 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
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21#include <math.h>
22#include <stdint.h>
23
24#include "libavutil/common.h"
25#include "internal.h"
26
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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
be394968 57static void SET_TYPE(resample_nearest)(void *dst0, int dst_index, const void *src0, unsigned int index)
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58{
59 FELEM *dst = dst0;
60 const FELEM *src = src0;
61 dst[dst_index] = src[index];
62}
63
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64static 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
f20892eb 85static void SET_TYPE(resample_one)(ResampleContext *c,
64103976 86 void *dst0, int dst_index, const void *src0,
be394968 87 unsigned int index, int frac)
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88{
89 FELEM *dst = dst0;
90 const FELEM *src = src0;
3c84f6b5 91 int i;
be394968 92 unsigned int sample_index = index >> c->phase_shift;
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93 FELEM2 val = 0;
94 FELEM *filter = ((FELEM *)c->filter_bank) +
95 c->filter_length * (index & c->phase_mask);
64103976 96
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97 for (i = 0; i < c->filter_length; i++)
98 val += src[sample_index + i] * (FELEM2)filter[i];
64103976 99
3c84f6b5 100 OUT(dst[dst_index], val);
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101}
102
103static 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