lavr: fix the decision for writing directly to the output buffer
[libav.git] / libavresample / resample_template.c
CommitLineData
64103976
JR
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
21#if defined(CONFIG_RESAMPLE_DBL)
22#define SET_TYPE(func) func ## _dbl
23#define FELEM double
24#define FELEM2 double
25#define FELEML double
26#define OUT(d, v) d = v
27#define DBL_TO_FELEM(d, v) d = v
28#elif defined(CONFIG_RESAMPLE_FLT)
29#define SET_TYPE(func) func ## _flt
30#define FELEM float
31#define FELEM2 float
32#define FELEML float
33#define OUT(d, v) d = v
34#define DBL_TO_FELEM(d, v) d = v
35#elif defined(CONFIG_RESAMPLE_S32)
36#define SET_TYPE(func) func ## _s32
37#define FELEM int32_t
38#define FELEM2 int64_t
39#define FELEML int64_t
40#define OUT(d, v) d = av_clipl_int32((v + (1 << 29)) >> 30)
41#define DBL_TO_FELEM(d, v) d = av_clipl_int32(llrint(v * (1 << 30)));
42#else
43#define SET_TYPE(func) func ## _s16
44#define FELEM int16_t
45#define FELEM2 int32_t
46#define FELEML int64_t
47#define OUT(d, v) d = av_clip_int16((v + (1 << 14)) >> 15)
48#define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15)))
49#endif
50
51static void SET_TYPE(resample_one)(ResampleContext *c, int no_filter,
52 void *dst0, int dst_index, const void *src0,
53 int src_size, int index, int frac)
54{
55 FELEM *dst = dst0;
56 const FELEM *src = src0;
57
58 if (no_filter) {
59 dst[dst_index] = src[index];
60 } else {
61 int i;
62 int sample_index = index >> c->phase_shift;
63 FELEM2 val = 0;
64 FELEM *filter = ((FELEM *)c->filter_bank) +
65 c->filter_length * (index & c->phase_mask);
66
67 if (sample_index < 0) {
68 for (i = 0; i < c->filter_length; i++)
69 val += src[FFABS(sample_index + i) % src_size] *
70 (FELEM2)filter[i];
71 } else if (c->linear) {
72 FELEM2 v2 = 0;
73 for (i = 0; i < c->filter_length; i++) {
74 val += src[abs(sample_index + i)] * (FELEM2)filter[i];
75 v2 += src[abs(sample_index + i)] * (FELEM2)filter[i + c->filter_length];
76 }
77 val += (v2 - val) * (FELEML)frac / c->src_incr;
78 } else {
79 for (i = 0; i < c->filter_length; i++)
80 val += src[sample_index + i] * (FELEM2)filter[i];
81 }
82
83 OUT(dst[dst_index], val);
84 }
85}
86
87static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase,
88 int tap_count)
89{
90 int i;
91 FELEM *filter = ((FELEM *)filter0) + phase * tap_count;
92 for (i = 0; i < tap_count; i++) {
93 DBL_TO_FELEM(filter[i], tab[i]);
94 }
95}
96
97#undef SET_TYPE
98#undef FELEM
99#undef FELEM2
100#undef FELEML
101#undef OUT
102#undef DBL_TO_FELEM