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 (_, 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