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1.1 root 1: /*
2: * QEMU Mixing engine
1.1.1.2 root 3: *
4: * Copyright (c) 2004-2005 Vassili Karpov (malc)
5: *
1.1 root 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:
1.1.1.2 root 30: #ifndef SIGNED
31: #define HALF (IN_MAX >> 1)
32: #endif
33:
34: #define ET glue (ENDIAN_CONVERSION, glue (_, IN_T))
35:
36: #ifdef FLOAT_MIXENG
1.1.1.3 root 37: static mixeng_real inline glue (conv_, ET) (IN_T v)
1.1.1.2 root 38: {
39: IN_T nv = ENDIAN_CONVERT (v);
40:
41: #ifdef RECIPROCAL
42: #ifdef SIGNED
1.1.1.3 root 43: return nv * (1.f / (mixeng_real) (IN_MAX - IN_MIN));
1.1.1.2 root 44: #else
1.1.1.3 root 45: return (nv - HALF) * (1.f / (mixeng_real) IN_MAX);
1.1.1.2 root 46: #endif
47: #else /* !RECIPROCAL */
1.1 root 48: #ifdef SIGNED
1.1.1.5 ! root 49: return nv / (mixeng_real) ((mixeng_real) IN_MAX - IN_MIN);
1.1 root 50: #else
1.1.1.3 root 51: return (nv - HALF) / (mixeng_real) IN_MAX;
1.1 root 52: #endif
1.1.1.2 root 53: #endif
54: }
1.1 root 55:
1.1.1.3 root 56: static IN_T inline glue (clip_, ET) (mixeng_real v)
1.1 root 57: {
1.1.1.2 root 58: if (v >= 0.5) {
59: return IN_MAX;
60: }
61: else if (v < -0.5) {
62: return IN_MIN;
63: }
64:
65: #ifdef SIGNED
1.1.1.5 ! root 66: return ENDIAN_CONVERT ((IN_T) (v * ((mixeng_real) IN_MAX - IN_MIN)));
1.1.1.2 root 67: #else
68: return ENDIAN_CONVERT ((IN_T) ((v * IN_MAX) + HALF));
69: #endif
70: }
71:
72: #else /* !FLOAT_MIXENG */
73:
74: static inline int64_t glue (conv_, ET) (IN_T v)
75: {
76: IN_T nv = ENDIAN_CONVERT (v);
1.1 root 77: #ifdef SIGNED
1.1.1.2 root 78: return ((int64_t) nv) << (32 - SHIFT);
1.1 root 79: #else
1.1.1.2 root 80: return ((int64_t) nv - HALF) << (32 - SHIFT);
1.1 root 81: #endif
82: }
83:
1.1.1.2 root 84: static inline IN_T glue (clip_, ET) (int64_t v)
1.1 root 85: {
1.1.1.2 root 86: if (v >= 0x7f000000) {
1.1 root 87: return IN_MAX;
1.1.1.2 root 88: }
89: else if (v < -2147483648LL) {
1.1 root 90: return IN_MIN;
1.1.1.2 root 91: }
1.1 root 92:
93: #ifdef SIGNED
1.1.1.2 root 94: return ENDIAN_CONVERT ((IN_T) (v >> (32 - SHIFT)));
1.1 root 95: #else
1.1.1.2 root 96: return ENDIAN_CONVERT ((IN_T) ((v >> (32 - SHIFT)) + HALF));
1.1 root 97: #endif
98: }
1.1.1.2 root 99: #endif
1.1 root 100:
1.1.1.2 root 101: static void glue (glue (conv_, ET), _to_stereo)
1.1.1.4 root 102: (struct st_sample *dst, const void *src, int samples)
1.1 root 103: {
1.1.1.3 root 104: struct st_sample *out = dst;
1.1 root 105: IN_T *in = (IN_T *) src;
1.1.1.4 root 106:
1.1 root 107: while (samples--) {
1.1.1.4 root 108: out->l = glue (conv_, ET) (*in++);
109: out->r = glue (conv_, ET) (*in++);
1.1 root 110: out += 1;
111: }
112: }
113:
1.1.1.2 root 114: static void glue (glue (conv_, ET), _to_mono)
1.1.1.4 root 115: (struct st_sample *dst, const void *src, int samples)
1.1 root 116: {
1.1.1.3 root 117: struct st_sample *out = dst;
1.1 root 118: IN_T *in = (IN_T *) src;
1.1.1.4 root 119:
1.1 root 120: while (samples--) {
1.1.1.4 root 121: out->l = glue (conv_, ET) (in[0]);
1.1 root 122: out->r = out->l;
123: out += 1;
124: in += 1;
125: }
126: }
127:
1.1.1.2 root 128: static void glue (glue (clip_, ET), _from_stereo)
1.1.1.3 root 129: (void *dst, const struct st_sample *src, int samples)
1.1 root 130: {
1.1.1.3 root 131: const struct st_sample *in = src;
1.1 root 132: IN_T *out = (IN_T *) dst;
133: while (samples--) {
1.1.1.2 root 134: *out++ = glue (clip_, ET) (in->l);
135: *out++ = glue (clip_, ET) (in->r);
1.1 root 136: in += 1;
137: }
138: }
139:
1.1.1.2 root 140: static void glue (glue (clip_, ET), _from_mono)
1.1.1.3 root 141: (void *dst, const struct st_sample *src, int samples)
1.1 root 142: {
1.1.1.3 root 143: const struct st_sample *in = src;
1.1 root 144: IN_T *out = (IN_T *) dst;
145: while (samples--) {
1.1.1.2 root 146: *out++ = glue (clip_, ET) (in->l + in->r);
1.1 root 147: in += 1;
148: }
149: }
150:
1.1.1.2 root 151: #undef ET
1.1 root 152: #undef HALF
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