1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/* $Id$ */
/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <inttypes.h>
#include <liboil/liboilfuncs.h>
#include <pulsecore/sconv.h>
#include <pulsecore/macro.h>
#include <pulsecore/log.h>
#include "endianmacros.h"
#include "sconv-s16le.h"
#ifndef INT16_FROM
#define INT16_FROM INT16_FROM_LE
#endif
#ifndef INT16_TO
#define INT16_TO INT16_TO_LE
#endif
#ifndef SWAP_WORDS
#ifdef WORDS_BIGENDIAN
#define SWAP_WORDS 1
#else
#define SWAP_WORDS 0
#endif
#endif
void pa_sconv_s16le_to_float32ne(unsigned n, const int16_t *a, float *b) {
pa_assert(a);
pa_assert(b);
#if SWAP_WORDS == 1
for (; n > 0; n--) {
int16_t s = *(a++);
*(b++) = ((float) INT16_FROM(s))/0x7FFF;
}
#else
{
static const double add = 0, factor = 1.0/0x7FFF;
oil_scaleconv_f32_s16(b, a, n, &add, &factor);
}
#endif
}
void pa_sconv_s16le_from_float32ne(unsigned n, const float *a, int16_t *b) {
pa_assert(a);
pa_assert(b);
#if SWAP_WORDS == 1
for (; n > 0; n--) {
int16_t s;
float v = *(a++);
if (v > 1)
v = 1;
if (v < -1)
v = -1;
s = (int16_t) (v * 0x7FFF);
*(b++) = INT16_TO(s);
}
#else
{
static const double add = 0, factor = 0x7FFF;
oil_scaleconv_s16_f32(b, a, n, &add, &factor);
}
#endif
}
void pa_sconv_s16le_to_float32re(unsigned n, const int16_t *a, float *b) {
pa_assert(a);
pa_assert(b);
#if SWAP_WORDS == 1
for (; n > 0; n--) {
int16_t s = *(a++);
float k = ((float) INT16_FROM(s))/0x7FFF;
uint32_t *j = (uint32_t*) &k;
*j = UINT32_SWAP(*j);
*(b++) = k;
}
#endif
}
void pa_sconv_s16le_from_float32re(unsigned n, const float *a, int16_t *b) {
pa_assert(a);
pa_assert(b);
#if SWAP_WORDS == 1
for (; n > 0; n--) {
int16_t s;
float v = *(a++);
uint32_t *j = (uint32_t*) &v;
*j = UINT32_SWAP(*j);
if (v > 1)
v = 1;
if (v < -1)
v = -1;
s = (int16_t) (v * 0x7FFF);
*(b++) = INT16_TO(s);
}
#endif
}
|
