qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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mixeng_template.h (3969B)

      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