2 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/common.h"
27 #if defined(CONFIG_RESAMPLE_DBL)
28 #define SET_TYPE(func) func ## _dbl
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
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
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)));
49 #define SET_TYPE(func) func ## _s16
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)))
57 static void SET_TYPE(resample_nearest)(void *dst0, int dst_index, const void *src0, unsigned int index)
60 const FELEM *src = src0;
61 dst[dst_index] = src[index];
64 static void SET_TYPE(resample_linear)(ResampleContext *c, void *dst0, int dst_index,
65 const void *src0, unsigned int index, int frac)
68 const FELEM *src = src0;
70 unsigned int sample_index = index >> c->phase_shift;
72 FELEM *filter = ((FELEM *)c->filter_bank) +
73 c->filter_length * (index & c->phase_mask);
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];
80 val += (v2 - val) * (FELEML)frac / c->src_incr;
82 OUT(dst[dst_index], val);
85 static void SET_TYPE(resample_one)(ResampleContext *c,
86 void *dst0, int dst_index, const void *src0,
87 unsigned int index, int frac)
90 const FELEM *src = src0;
92 unsigned int sample_index = index >> c->phase_shift;
94 FELEM *filter = ((FELEM *)c->filter_bank) +
95 c->filter_length * (index & c->phase_mask);
97 for (i = 0; i < c->filter_length; i++)
98 val += src[sample_index + i] * (FELEM2)filter[i];
100 OUT(dst[dst_index], val);
103 static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase,
107 FELEM *filter = ((FELEM *)filter0) + phase * tap_count;
108 for (i = 0; i < tap_count; i++) {
109 DBL_TO_FELEM(filter[i], tab[i]);