root / audio / mixeng_template.h @ d796321b
History | View | Annotate | Download (4.1 kB)
1 |
/*
|
---|---|
2 |
* QEMU Mixing engine
|
3 |
*
|
4 |
* Copyright (c) 2004-2005 Vassili Karpov (malc)
|
5 |
*
|
6 |
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
7 |
* of this software and associated documentation files (the "Software"), to deal
|
8 |
* in the Software without restriction, including without limitation the rights
|
9 |
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
10 |
* copies of the Software, and to permit persons to whom the Software is
|
11 |
* furnished to do so, subject to the following conditions:
|
12 |
*
|
13 |
* The above copyright notice and this permission notice shall be included in
|
14 |
* all copies or substantial portions of the Software.
|
15 |
*
|
16 |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
17 |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
18 |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
19 |
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
20 |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
21 |
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
22 |
* THE SOFTWARE.
|
23 |
*/
|
24 |
|
25 |
/*
|
26 |
* Tusen tack till Mike Nordell
|
27 |
* dec++'ified by Dscho
|
28 |
*/
|
29 |
|
30 |
#ifndef SIGNED
|
31 |
#define HALF (IN_MAX >> 1) |
32 |
#endif
|
33 |
|
34 |
#ifdef NOVOL
|
35 |
#define VOL(a, b) a
|
36 |
#else
|
37 |
#ifdef FLOAT_MIXENG
|
38 |
#define VOL(a, b) ((a) * (b))
|
39 |
#else
|
40 |
#define VOL(a, b) ((a) * (b)) >> 32 |
41 |
#endif
|
42 |
#endif
|
43 |
|
44 |
#define ET glue (ENDIAN_CONVERSION, glue (_, IN_T))
|
45 |
|
46 |
#ifdef FLOAT_MIXENG
|
47 |
static real_t inline glue (conv_, ET) (IN_T v) |
48 |
{ |
49 |
IN_T nv = ENDIAN_CONVERT (v); |
50 |
|
51 |
#ifdef RECIPROCAL
|
52 |
#ifdef SIGNED
|
53 |
return nv * (1.f / (real_t) (IN_MAX - IN_MIN)); |
54 |
#else
|
55 |
return (nv - HALF) * (1.f / (real_t) IN_MAX); |
56 |
#endif
|
57 |
#else /* !RECIPROCAL */ |
58 |
#ifdef SIGNED
|
59 |
return nv / (real_t) (IN_MAX - IN_MIN);
|
60 |
#else
|
61 |
return (nv - HALF) / (real_t) IN_MAX;
|
62 |
#endif
|
63 |
#endif
|
64 |
} |
65 |
|
66 |
static IN_T inline glue (clip_, ET) (real_t v) |
67 |
{ |
68 |
if (v >= 0.5) { |
69 |
return IN_MAX;
|
70 |
} |
71 |
else if (v < -0.5) { |
72 |
return IN_MIN;
|
73 |
} |
74 |
|
75 |
#ifdef SIGNED
|
76 |
return ENDIAN_CONVERT ((IN_T) (v * (IN_MAX - IN_MIN)));
|
77 |
#else
|
78 |
return ENDIAN_CONVERT ((IN_T) ((v * IN_MAX) + HALF));
|
79 |
#endif
|
80 |
} |
81 |
|
82 |
#else /* !FLOAT_MIXENG */ |
83 |
|
84 |
static inline int64_t glue (conv_, ET) (IN_T v) |
85 |
{ |
86 |
IN_T nv = ENDIAN_CONVERT (v); |
87 |
#ifdef SIGNED
|
88 |
return ((int64_t) nv) << (32 - SHIFT); |
89 |
#else
|
90 |
return ((int64_t) nv - HALF) << (32 - SHIFT); |
91 |
#endif
|
92 |
} |
93 |
|
94 |
static inline IN_T glue (clip_, ET) (int64_t v) |
95 |
{ |
96 |
if (v >= 0x7f000000) { |
97 |
return IN_MAX;
|
98 |
} |
99 |
else if (v < -2147483648LL) { |
100 |
return IN_MIN;
|
101 |
} |
102 |
|
103 |
#ifdef SIGNED
|
104 |
return ENDIAN_CONVERT ((IN_T) (v >> (32 - SHIFT))); |
105 |
#else
|
106 |
return ENDIAN_CONVERT ((IN_T) ((v >> (32 - SHIFT)) + HALF)); |
107 |
#endif
|
108 |
} |
109 |
#endif
|
110 |
|
111 |
static void glue (glue (conv_, ET), _to_stereo) |
112 |
(st_sample_t *dst, const void *src, int samples, volume_t *vol) |
113 |
{ |
114 |
st_sample_t *out = dst; |
115 |
IN_T *in = (IN_T *) src; |
116 |
#ifndef NOVOL
|
117 |
if (vol->mute) {
|
118 |
mixeng_clear (dst, samples); |
119 |
return;
|
120 |
} |
121 |
#else
|
122 |
(void) vol;
|
123 |
#endif
|
124 |
while (samples--) {
|
125 |
out->l = VOL (glue (conv_, ET) (*in++), vol->l); |
126 |
out->r = VOL (glue (conv_, ET) (*in++), vol->r); |
127 |
out += 1;
|
128 |
} |
129 |
} |
130 |
|
131 |
static void glue (glue (conv_, ET), _to_mono) |
132 |
(st_sample_t *dst, const void *src, int samples, volume_t *vol) |
133 |
{ |
134 |
st_sample_t *out = dst; |
135 |
IN_T *in = (IN_T *) src; |
136 |
#ifndef NOVOL
|
137 |
if (vol->mute) {
|
138 |
mixeng_clear (dst, samples); |
139 |
return;
|
140 |
} |
141 |
#else
|
142 |
(void) vol;
|
143 |
#endif
|
144 |
while (samples--) {
|
145 |
out->l = VOL (glue (conv_, ET) (in[0]), vol->l);
|
146 |
out->r = out->l; |
147 |
out += 1;
|
148 |
in += 1;
|
149 |
} |
150 |
} |
151 |
|
152 |
static void glue (glue (clip_, ET), _from_stereo) |
153 |
(void *dst, const st_sample_t *src, int samples) |
154 |
{ |
155 |
const st_sample_t *in = src;
|
156 |
IN_T *out = (IN_T *) dst; |
157 |
while (samples--) {
|
158 |
*out++ = glue (clip_, ET) (in->l); |
159 |
*out++ = glue (clip_, ET) (in->r); |
160 |
in += 1;
|
161 |
} |
162 |
} |
163 |
|
164 |
static void glue (glue (clip_, ET), _from_mono) |
165 |
(void *dst, const st_sample_t *src, int samples) |
166 |
{ |
167 |
const st_sample_t *in = src;
|
168 |
IN_T *out = (IN_T *) dst; |
169 |
while (samples--) {
|
170 |
*out++ = glue (clip_, ET) (in->l + in->r); |
171 |
in += 1;
|
172 |
} |
173 |
} |
174 |
|
175 |
#undef ET
|
176 |
#undef HALF
|
177 |
#undef VOL
|