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