audio/mixeng_template.h

   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 (glue (glue (_, ITYPE), BSIZE), _t))
  35 #define IN_T glue (glue (ITYPE, BSIZE), _t)
  36
  37 #ifdef FLOAT_MIXENG
  38 static inline mixeng_real glue (conv_, ET) (IN_T v)
  39 {
  40     IN_T nv = ENDIAN_CONVERT (v);
  41
  42 #ifdef RECIPROCAL
  43 #ifdef SIGNED
  44     return nv * (2.f / ((mixeng_real)IN_MAX - IN_MIN));
  45 #else
  46     return (nv - HALF) * (2.f / (mixeng_real)IN_MAX);
  47 #endif
  48 #else  /* !RECIPROCAL */
  49 #ifdef SIGNED
  50     return nv / (((mixeng_real)IN_MAX - IN_MIN) / 2.f);
  51 #else
  52     return (nv - HALF) / ((mixeng_real)IN_MAX / 2.f);
  53 #endif
  54 #endif
  55 }
  56
  57 static inline IN_T glue (clip_, ET) (mixeng_real v)
  58 {
  59     if (v >= 1.f) {
  60         return IN_MAX;
  61     } else if (v < -1.f) {
  62         return IN_MIN;
  63     }
  64
  65 #ifdef SIGNED
  66     return ENDIAN_CONVERT((IN_T)(v * (((mixeng_real)IN_MAX - IN_MIN) / 2.f)));
  67 #else
  68     return ENDIAN_CONVERT((IN_T)((v * ((mixeng_real)IN_MAX / 2.f)) + 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 >= 0x7fffffffLL) {
  87         return IN_MAX;
  88     } else if (v < -2147483648LL) {
  89         return IN_MIN;
  90     }
  91
  92 #ifdef SIGNED
  93     return ENDIAN_CONVERT ((IN_T) (v >> (32 - SHIFT)));
  94 #else
  95     return ENDIAN_CONVERT ((IN_T) ((v >> (32 - SHIFT)) + HALF));
  96 #endif
  97 }
  98 #endif
  99
 100 static void glue (glue (conv_, ET), _to_stereo)
 101     (struct st_sample *dst, const void *src, int samples)
 102 {
 103     struct st_sample *out = dst;
 104     IN_T *in = (IN_T *) src;
 105
 106     while (samples--) {
 107         out->l = glue (conv_, ET) (*in++);
 108         out->r = glue (conv_, ET) (*in++);
 109         out += 1;
 110     }
 111 }
 112
 113 static void glue (glue (conv_, ET), _to_mono)
 114     (struct st_sample *dst, const void *src, int samples)
 115 {
 116     struct st_sample *out = dst;
 117     IN_T *in = (IN_T *) src;
 118
 119     while (samples--) {
 120         out->l = glue (conv_, ET) (in[0]);
 121         out->r = out->l;
 122         out += 1;
 123         in += 1;
 124     }
 125 }
 126
 127 static void glue (glue (clip_, ET), _from_stereo)
 128     (void *dst, const struct st_sample *src, int samples)
 129 {
 130     const struct st_sample *in = src;
 131     IN_T *out = (IN_T *) dst;
 132     while (samples--) {
 133         *out++ = glue (clip_, ET) (in->l);
 134         *out++ = glue (clip_, ET) (in->r);
 135         in += 1;
 136     }
 137 }
 138
 139 static void glue (glue (clip_, ET), _from_mono)
 140     (void *dst, const struct st_sample *src, int samples)
 141 {
 142     const struct st_sample *in = src;
 143     IN_T *out = (IN_T *) dst;
 144     while (samples--) {
 145         *out++ = glue (clip_, ET) (in->l + in->r);
 146         in += 1;
 147     }
 148 }
 149
 150 #undef ET
 151 #undef HALF
 152 #undef IN_T