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 #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 */
  58 #ifdef SIGNED
  59     return nv / (real_t) (IN_MAX - IN_MIN);
  60 #else
  61     return (nv - HALF) / (real_t) IN_MAX;
  62 #endif
  63 #endif
  64 }
  65
  66 static IN_T inline glue (clip_, ET) (real_t 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     (st_sample_t *dst, const void *src, int samples, volume_t *vol)
 113 {
 114     st_sample_t *out = dst;
 115     IN_T *in = (IN_T *) src;
 116 #ifndef NOVOL
 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     (st_sample_t *dst, const void *src, int samples, volume_t *vol)
 133 {
 134     st_sample_t *out = dst;
 135     IN_T *in = (IN_T *) src;
 136 #ifndef NOVOL
 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 st_sample_t *src, int samples)
 154 {
 155     const st_sample_t *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 st_sample_t *src, int samples)
 166 {
 167     const st_sample_t *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