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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:
1.1.1.6 ! root 34: #define ET glue (ENDIAN_CONVERSION, glue (glue (glue (_, ITYPE), BSIZE), _t))
! 35: #define IN_T glue (glue (ITYPE, BSIZE), _t)
1.1.1.2 root 36:
37: #ifdef FLOAT_MIXENG
1.1.1.3 root 38: static mixeng_real inline glue (conv_, ET) (IN_T v)
1.1.1.2 root 39: {
40: IN_T nv = ENDIAN_CONVERT (v);
41:
42: #ifdef RECIPROCAL
43: #ifdef SIGNED
1.1.1.3 root 44: return nv * (1.f / (mixeng_real) (IN_MAX - IN_MIN));
1.1.1.2 root 45: #else
1.1.1.3 root 46: return (nv - HALF) * (1.f / (mixeng_real) IN_MAX);
1.1.1.2 root 47: #endif
48: #else /* !RECIPROCAL */
1.1 root 49: #ifdef SIGNED
1.1.1.5 root 50: return nv / (mixeng_real) ((mixeng_real) IN_MAX - IN_MIN);
1.1 root 51: #else
1.1.1.3 root 52: return (nv - HALF) / (mixeng_real) IN_MAX;
1.1 root 53: #endif
1.1.1.2 root 54: #endif
55: }
1.1 root 56:
1.1.1.3 root 57: static IN_T inline glue (clip_, ET) (mixeng_real v)
1.1 root 58: {
1.1.1.2 root 59: if (v >= 0.5) {
60: return IN_MAX;
61: }
62: else if (v < -0.5) {
63: return IN_MIN;
64: }
65:
66: #ifdef SIGNED
1.1.1.5 root 67: return ENDIAN_CONVERT ((IN_T) (v * ((mixeng_real) IN_MAX - IN_MIN)));
1.1.1.2 root 68: #else
69: return ENDIAN_CONVERT ((IN_T) ((v * IN_MAX) + HALF));
70: #endif
71: }
72:
73: #else /* !FLOAT_MIXENG */
74:
75: static inline int64_t glue (conv_, ET) (IN_T v)
76: {
77: IN_T nv = ENDIAN_CONVERT (v);
1.1 root 78: #ifdef SIGNED
1.1.1.2 root 79: return ((int64_t) nv) << (32 - SHIFT);
1.1 root 80: #else
1.1.1.2 root 81: return ((int64_t) nv - HALF) << (32 - SHIFT);
1.1 root 82: #endif
83: }
84:
1.1.1.2 root 85: static inline IN_T glue (clip_, ET) (int64_t v)
1.1 root 86: {
1.1.1.2 root 87: if (v >= 0x7f000000) {
1.1 root 88: return IN_MAX;
1.1.1.2 root 89: }
90: else if (v < -2147483648LL) {
1.1 root 91: return IN_MIN;
1.1.1.2 root 92: }
1.1 root 93:
94: #ifdef SIGNED
1.1.1.2 root 95: return ENDIAN_CONVERT ((IN_T) (v >> (32 - SHIFT)));
1.1 root 96: #else
1.1.1.2 root 97: return ENDIAN_CONVERT ((IN_T) ((v >> (32 - SHIFT)) + HALF));
1.1 root 98: #endif
99: }
1.1.1.2 root 100: #endif
1.1 root 101:
1.1.1.2 root 102: static void glue (glue (conv_, ET), _to_stereo)
1.1.1.4 root 103: (struct st_sample *dst, const void *src, int samples)
1.1 root 104: {
1.1.1.3 root 105: struct st_sample *out = dst;
1.1 root 106: IN_T *in = (IN_T *) src;
1.1.1.4 root 107:
1.1 root 108: while (samples--) {
1.1.1.4 root 109: out->l = glue (conv_, ET) (*in++);
110: out->r = glue (conv_, ET) (*in++);
1.1 root 111: out += 1;
112: }
113: }
114:
1.1.1.2 root 115: static void glue (glue (conv_, ET), _to_mono)
1.1.1.4 root 116: (struct st_sample *dst, const void *src, int samples)
1.1 root 117: {
1.1.1.3 root 118: struct st_sample *out = dst;
1.1 root 119: IN_T *in = (IN_T *) src;
1.1.1.4 root 120:
1.1 root 121: while (samples--) {
1.1.1.4 root 122: out->l = glue (conv_, ET) (in[0]);
1.1 root 123: out->r = out->l;
124: out += 1;
125: in += 1;
126: }
127: }
128:
1.1.1.2 root 129: static void glue (glue (clip_, ET), _from_stereo)
1.1.1.3 root 130: (void *dst, const struct st_sample *src, int samples)
1.1 root 131: {
1.1.1.3 root 132: const struct st_sample *in = src;
1.1 root 133: IN_T *out = (IN_T *) dst;
134: while (samples--) {
1.1.1.2 root 135: *out++ = glue (clip_, ET) (in->l);
136: *out++ = glue (clip_, ET) (in->r);
1.1 root 137: in += 1;
138: }
139: }
140:
1.1.1.2 root 141: static void glue (glue (clip_, ET), _from_mono)
1.1.1.3 root 142: (void *dst, const struct st_sample *src, int samples)
1.1 root 143: {
1.1.1.3 root 144: const struct st_sample *in = src;
1.1 root 145: IN_T *out = (IN_T *) dst;
146: while (samples--) {
1.1.1.2 root 147: *out++ = glue (clip_, ET) (in->l + in->r);
1.1 root 148: in += 1;
149: }
150: }
151:
1.1.1.2 root 152: #undef ET
1.1 root 153: #undef HALF
1.1.1.6 ! root 154: #undef IN_T
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