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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: #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 */
1.1 root 58: #ifdef SIGNED
1.1.1.2 ! root 59: return nv / (real_t) (IN_MAX - IN_MIN);
1.1 root 60: #else
1.1.1.2 ! root 61: return (nv - HALF) / (real_t) IN_MAX;
1.1 root 62: #endif
1.1.1.2 ! root 63: #endif
! 64: }
1.1 root 65:
1.1.1.2 ! root 66: static IN_T inline glue (clip_, ET) (real_t v)
1.1 root 67: {
1.1.1.2 ! root 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);
1.1 root 87: #ifdef SIGNED
1.1.1.2 ! root 88: return ((int64_t) nv) << (32 - SHIFT);
1.1 root 89: #else
1.1.1.2 ! root 90: return ((int64_t) nv - HALF) << (32 - SHIFT);
1.1 root 91: #endif
92: }
93:
1.1.1.2 ! root 94: static inline IN_T glue (clip_, ET) (int64_t v)
1.1 root 95: {
1.1.1.2 ! root 96: if (v >= 0x7f000000) {
1.1 root 97: return IN_MAX;
1.1.1.2 ! root 98: }
! 99: else if (v < -2147483648LL) {
1.1 root 100: return IN_MIN;
1.1.1.2 ! root 101: }
1.1 root 102:
103: #ifdef SIGNED
1.1.1.2 ! root 104: return ENDIAN_CONVERT ((IN_T) (v >> (32 - SHIFT)));
1.1 root 105: #else
1.1.1.2 ! root 106: return ENDIAN_CONVERT ((IN_T) ((v >> (32 - SHIFT)) + HALF));
1.1 root 107: #endif
108: }
1.1.1.2 ! root 109: #endif
1.1 root 110:
1.1.1.2 ! root 111: static void glue (glue (conv_, ET), _to_stereo)
! 112: (st_sample_t *dst, const void *src, int samples, volume_t *vol)
1.1 root 113: {
1.1.1.2 ! root 114: st_sample_t *out = dst;
1.1 root 115: IN_T *in = (IN_T *) src;
1.1.1.2 ! root 116: #ifndef NOVOL
! 117: if (vol->mute) {
! 118: mixeng_clear (dst, samples);
! 119: return;
! 120: }
! 121: #else
! 122: (void) vol;
! 123: #endif
1.1 root 124: while (samples--) {
1.1.1.2 ! root 125: out->l = VOL (glue (conv_, ET) (*in++), vol->l);
! 126: out->r = VOL (glue (conv_, ET) (*in++), vol->r);
1.1 root 127: out += 1;
128: }
129: }
130:
1.1.1.2 ! root 131: static void glue (glue (conv_, ET), _to_mono)
! 132: (st_sample_t *dst, const void *src, int samples, volume_t *vol)
1.1 root 133: {
1.1.1.2 ! root 134: st_sample_t *out = dst;
1.1 root 135: IN_T *in = (IN_T *) src;
1.1.1.2 ! root 136: #ifndef NOVOL
! 137: if (vol->mute) {
! 138: mixeng_clear (dst, samples);
! 139: return;
! 140: }
! 141: #else
! 142: (void) vol;
! 143: #endif
1.1 root 144: while (samples--) {
1.1.1.2 ! root 145: out->l = VOL (glue (conv_, ET) (in[0]), vol->l);
1.1 root 146: out->r = out->l;
147: out += 1;
148: in += 1;
149: }
150: }
151:
1.1.1.2 ! root 152: static void glue (glue (clip_, ET), _from_stereo)
! 153: (void *dst, const st_sample_t *src, int samples)
1.1 root 154: {
1.1.1.2 ! root 155: const st_sample_t *in = src;
1.1 root 156: IN_T *out = (IN_T *) dst;
157: while (samples--) {
1.1.1.2 ! root 158: *out++ = glue (clip_, ET) (in->l);
! 159: *out++ = glue (clip_, ET) (in->r);
1.1 root 160: in += 1;
161: }
162: }
163:
1.1.1.2 ! root 164: static void glue (glue (clip_, ET), _from_mono)
! 165: (void *dst, const st_sample_t *src, int samples)
1.1 root 166: {
1.1.1.2 ! root 167: const st_sample_t *in = src;
1.1 root 168: IN_T *out = (IN_T *) dst;
169: while (samples--) {
1.1.1.2 ! root 170: *out++ = glue (clip_, ET) (in->l + in->r);
1.1 root 171: in += 1;
172: }
173: }
174:
1.1.1.2 ! root 175: #undef ET
1.1 root 176: #undef HALF
1.1.1.2 ! root 177: #undef VOL
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