xref: /openbmc/qemu/audio/mixeng_template.h (revision 52a96afa)
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 #define ET glue (ENDIAN_CONVERSION, glue (glue (glue (_, ITYPE), BSIZE), _t))
35 #define IN_T glue (glue (ITYPE, BSIZE), _t)
36 
37 #ifdef FLOAT_MIXENG
glue(conv_,ET)38 static inline mixeng_real glue (conv_, ET) (IN_T v)
39 {
40     IN_T nv = ENDIAN_CONVERT (v);
41 
42 #ifdef RECIPROCAL
43 #ifdef SIGNED
44     return nv * (2.f / ((mixeng_real)IN_MAX - IN_MIN));
45 #else
46     return (nv - HALF) * (2.f / (mixeng_real)IN_MAX);
47 #endif
48 #else  /* !RECIPROCAL */
49 #ifdef SIGNED
50     return nv / (((mixeng_real)IN_MAX - IN_MIN) / 2.f);
51 #else
52     return (nv - HALF) / ((mixeng_real)IN_MAX / 2.f);
53 #endif
54 #endif
55 }
56 
glue(clip_,ET)57 static inline IN_T glue (clip_, ET) (mixeng_real v)
58 {
59     if (v >= 1.f) {
60         return IN_MAX;
61     } else if (v < -1.f) {
62         return IN_MIN;
63     }
64 
65 #ifdef SIGNED
66     return ENDIAN_CONVERT((IN_T)(v * (((mixeng_real)IN_MAX - IN_MIN) / 2.f)));
67 #else
68     return ENDIAN_CONVERT((IN_T)((v * ((mixeng_real)IN_MAX / 2.f)) + HALF));
69 #endif
70 }
71 
72 #else  /* !FLOAT_MIXENG */
73 
glue(conv_,ET)74 static inline int64_t glue (conv_, ET) (IN_T v)
75 {
76     IN_T nv = ENDIAN_CONVERT (v);
77 #ifdef SIGNED
78     return ((int64_t) nv) << (32 - SHIFT);
79 #else
80     return ((int64_t) nv - HALF) << (32 - SHIFT);
81 #endif
82 }
83 
glue(clip_,ET)84 static inline IN_T glue (clip_, ET) (int64_t v)
85 {
86     if (v >= 0x7fffffffLL) {
87         return IN_MAX;
88     } else if (v < -2147483648LL) {
89         return IN_MIN;
90     }
91 
92 #ifdef SIGNED
93     return ENDIAN_CONVERT ((IN_T) (v >> (32 - SHIFT)));
94 #else
95     return ENDIAN_CONVERT ((IN_T) ((v >> (32 - SHIFT)) + HALF));
96 #endif
97 }
98 #endif
99 
glue(glue (conv_,ET),_to_stereo)100 static void glue (glue (conv_, ET), _to_stereo)
101     (struct st_sample *dst, const void *src, int samples)
102 {
103     struct st_sample *out = dst;
104     IN_T *in = (IN_T *) src;
105 
106     while (samples--) {
107         out->l = glue (conv_, ET) (*in++);
108         out->r = glue (conv_, ET) (*in++);
109         out += 1;
110     }
111 }
112 
glue(glue (conv_,ET),_to_mono)113 static void glue (glue (conv_, ET), _to_mono)
114     (struct st_sample *dst, const void *src, int samples)
115 {
116     struct st_sample *out = dst;
117     IN_T *in = (IN_T *) src;
118 
119     while (samples--) {
120         out->l = glue (conv_, ET) (in[0]);
121         out->r = out->l;
122         out += 1;
123         in += 1;
124     }
125 }
126 
glue(glue (clip_,ET),_from_stereo)127 static void glue (glue (clip_, ET), _from_stereo)
128     (void *dst, const struct st_sample *src, int samples)
129 {
130     const struct st_sample *in = src;
131     IN_T *out = (IN_T *) dst;
132     while (samples--) {
133         *out++ = glue (clip_, ET) (in->l);
134         *out++ = glue (clip_, ET) (in->r);
135         in += 1;
136     }
137 }
138 
glue(glue (clip_,ET),_from_mono)139 static void glue (glue (clip_, ET), _from_mono)
140     (void *dst, const struct st_sample *src, int samples)
141 {
142     const struct st_sample *in = src;
143     IN_T *out = (IN_T *) dst;
144     while (samples--) {
145         *out++ = glue (clip_, ET) (in->l + in->r);
146         in += 1;
147     }
148 }
149 
150 #undef ET
151 #undef HALF
152 #undef IN_T
153