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 #ifdef CONFIG_MIXEMU 35 #ifdef FLOAT_MIXENG 36 #define VOL(a, b) ((a) * (b)) 37 #else 38 #define VOL(a, b) ((a) * (b)) >> 32 39 #endif 40 #else 41 #define VOL(a, b) a 42 #endif 43 44 #define ET glue (ENDIAN_CONVERSION, glue (_, IN_T)) 45 46 #ifdef FLOAT_MIXENG 47 static mixeng_real 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 / (mixeng_real) (IN_MAX - IN_MIN)); 54 #else 55 return (nv - HALF) * (1.f / (mixeng_real) IN_MAX); 56 #endif 57 #else /* !RECIPROCAL */ 58 #ifdef SIGNED 59 return nv / (mixeng_real) (IN_MAX - IN_MIN); 60 #else 61 return (nv - HALF) / (mixeng_real) IN_MAX; 62 #endif 63 #endif 64 } 65 66 static IN_T inline glue (clip_, ET) (mixeng_real v) 67 { 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); 87 #ifdef SIGNED 88 return ((int64_t) nv) << (32 - SHIFT); 89 #else 90 return ((int64_t) nv - HALF) << (32 - SHIFT); 91 #endif 92 } 93 94 static inline IN_T glue (clip_, ET) (int64_t v) 95 { 96 if (v >= 0x7f000000) { 97 return IN_MAX; 98 } 99 else if (v < -2147483648LL) { 100 return IN_MIN; 101 } 102 103 #ifdef SIGNED 104 return ENDIAN_CONVERT ((IN_T) (v >> (32 - SHIFT))); 105 #else 106 return ENDIAN_CONVERT ((IN_T) ((v >> (32 - SHIFT)) + HALF)); 107 #endif 108 } 109 #endif 110 111 static void glue (glue (conv_, ET), _to_stereo) 112 (struct st_sample *dst, const void *src, int samples, struct mixeng_volume *vol) 113 { 114 struct st_sample *out = dst; 115 IN_T *in = (IN_T *) src; 116 #ifdef CONFIG_MIXEMU 117 if (vol->mute) { 118 mixeng_clear (dst, samples); 119 return; 120 } 121 #else 122 (void) vol; 123 #endif 124 while (samples--) { 125 out->l = VOL (glue (conv_, ET) (*in++), vol->l); 126 out->r = VOL (glue (conv_, ET) (*in++), vol->r); 127 out += 1; 128 } 129 } 130 131 static void glue (glue (conv_, ET), _to_mono) 132 (struct st_sample *dst, const void *src, int samples, struct mixeng_volume *vol) 133 { 134 struct st_sample *out = dst; 135 IN_T *in = (IN_T *) src; 136 #ifdef CONFIG_MIXEMU 137 if (vol->mute) { 138 mixeng_clear (dst, samples); 139 return; 140 } 141 #else 142 (void) vol; 143 #endif 144 while (samples--) { 145 out->l = VOL (glue (conv_, ET) (in[0]), vol->l); 146 out->r = out->l; 147 out += 1; 148 in += 1; 149 } 150 } 151 152 static void glue (glue (clip_, ET), _from_stereo) 153 (void *dst, const struct st_sample *src, int samples) 154 { 155 const struct st_sample *in = src; 156 IN_T *out = (IN_T *) dst; 157 while (samples--) { 158 *out++ = glue (clip_, ET) (in->l); 159 *out++ = glue (clip_, ET) (in->r); 160 in += 1; 161 } 162 } 163 164 static void glue (glue (clip_, ET), _from_mono) 165 (void *dst, const struct st_sample *src, int samples) 166 { 167 const struct st_sample *in = src; 168 IN_T *out = (IN_T *) dst; 169 while (samples--) { 170 *out++ = glue (clip_, ET) (in->l + in->r); 171 in += 1; 172 } 173 } 174 175 #undef ET 176 #undef HALF 177 #undef VOL 178
