code.delx.au - pulseaudio/blob - src/pulsecore/endianmacros.h

   1 #ifndef fooendianmacroshfoo
   2 #define fooendianmacroshfoo
   3
   4 /***
   5   This file is part of PulseAudio.
   6
   7   Copyright 2004-2006 Lennart Poettering
   8   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   9
  10   PulseAudio is free software; you can redistribute it and/or modify
  11   it under the terms of the GNU Lesser General Public License as published
  12   by the Free Software Foundation; either version 2 of the License,
  13   or (at your option) any later version.
  14
  15   PulseAudio is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with PulseAudio; if not, write to the Free Software
  22   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  23   USA.
  24 ***/
  25
  26 #include <inttypes.h>
  27
  28 #ifndef PACKAGE
  29 #error "Please include config.h before including this file!"
  30 #endif
  31
  32 #ifdef HAVE_BYTESWAP_H
  33 #include <byteswap.h>
  34 #endif
  35
  36 #ifdef HAVE_BYTESWAP_H
  37 #define PA_INT16_SWAP(x) ((int16_t) bswap_16((uint16_t) x))
  38 #define PA_UINT16_SWAP(x) ((uint16_t) bswap_16((uint16_t) x))
  39 #define PA_INT32_SWAP(x) ((int32_t) bswap_32((uint32_t) x))
  40 #define PA_UINT32_SWAP(x) ((uint32_t) bswap_32((uint32_t) x))
  41 #else
  42 #define PA_INT16_SWAP(x) ( (int16_t) ( ((uint16_t) (x) >> 8) | ((uint16_t) (x) << 8) ) )
  43 #define PA_UINT16_SWAP(x) ( (uint16_t) ( ((uint16_t) (x) >> 8) | ((uint16_t) (x) << 8) ) )
  44 #define PA_INT32_SWAP(x) ( (int32_t) ( ((uint32_t) (x) >> 24) | ((uint32_t) (x) << 24) | (((uint32_t) (x) & 0xFF00) << 8) | ((((uint32_t) (x)) >> 8) & 0xFF00) ) )
  45 #define PA_UINT32_SWAP(x) ( (uint32_t) ( ((uint32_t) (x) >> 24) | ((uint32_t) (x) << 24) | (((uint32_t) (x) & 0xFF00) << 8) | ((((uint32_t) (x)) >> 8) & 0xFF00) ) )
  46 #endif
  47
  48 static inline uint32_t PA_READ24LE(const uint8_t *p) {
  49     return
  50         ((uint32_t) p[0] << 16) |
  51         ((uint32_t) p[1] << 8) |
  52         ((uint32_t) p[2]);
  53 }
  54
  55 static inline uint32_t PA_READ24BE(const uint8_t *p) {
  56     return
  57         ((uint32_t) p[2] << 16) |
  58         ((uint32_t) p[1] << 8) |
  59         ((uint32_t) p[0]);
  60 }
  61
  62 static inline void PA_WRITE24LE(uint8_t *p, uint32_t u) {
  63     p[0] = (uint8_t) (u >> 16);
  64     p[1] = (uint8_t) (u >> 8);
  65     p[2] = (uint8_t) u;
  66 }
  67
  68 static inline void PA_WRITE24BE(uint8_t *p, uint32_t u) {
  69     p[2] = (uint8_t) (u >> 16);
  70     p[1] = (uint8_t) (u >> 8);
  71     p[0] = (uint8_t) u;
  72 }
  73
  74 static inline float PA_FLOAT32_SWAP(float x) {
  75     union {
  76         float f;
  77         uint32_t u;
  78     } t;
  79
  80     t.f = x;
  81     t.u = PA_UINT32_SWAP(t.u);
  82     return t.f;
  83 }
  84
  85 #define PA_MAYBE_INT16_SWAP(c,x) ((c) ? PA_INT32_SWAP(x) : (x))
  86 #define PA_MAYBE_UINT16_SWAP(c,x) ((c) ? PA_UINT32_SWAP(x) : (x))
  87
  88 #define PA_MAYBE_INT32_SWAP(c,x) ((c) ? PA_INT32_SWAP(x) : (x))
  89 #define PA_MAYBE_UINT32_SWAP(c,x) ((c) ? PA_UINT32_SWAP(x) : (x))
  90
  91 #define PA_MAYBE_FLOAT32_SWAP(c,x) ((c) ? PA_FLOAT32_SWAP(x) : (x))
  92
  93 #ifdef WORDS_BIGENDIAN
  94  #define PA_INT16_FROM_LE(x) PA_INT16_SWAP(x)
  95  #define PA_INT16_FROM_BE(x) ((int16_t)(x))
  96
  97  #define PA_INT16_TO_LE(x) PA_INT16_SWAP(x)
  98  #define PA_INT16_TO_BE(x) ((int16_t)(x))
  99
 100  #define PA_UINT16_FROM_LE(x) PA_UINT16_SWAP(x)
 101  #define PA_UINT16_FROM_BE(x) ((uint16_t)(x))
 102
 103  #define PA_UINT16_TO_LE(x) PA_UINT16_SWAP(x)
 104  #define PA_UINT16_TO_BE(x) ((uint16_t)(x))
 105
 106  #define PA_INT32_FROM_LE(x) PA_INT32_SWAP(x)
 107  #define PA_INT32_FROM_BE(x) ((int32_t)(x))
 108
 109  #define PA_INT32_TO_LE(x) PA_INT32_SWAP(x)
 110  #define PA_INT32_TO_BE(x) ((int32_t)(x))
 111
 112  #define PA_UINT32_FROM_LE(x) PA_UINT32_SWAP(x)
 113  #define PA_UINT32_FROM_BE(x) ((uint32_t)(x))
 114
 115  #define PA_UINT32_TO_LE(x) PA_UINT32_SWAP(x)
 116  #define PA_UINT32_TO_BE(x) ((uint32_t)(x))
 117
 118  #define PA_FLOAT32_TO_LE(x) PA_FLOAT32_SWAP(x)
 119  #define PA_FLOAT32_TO_BE(x) ((float) (x))
 120
 121  #define PA_READ24NE(x) PA_READ24BE(x)
 122  #define PA_WRITE24NE(x,y) PA_WRITE24BE((x),(y))
 123
 124  #define PA_READ24RE(x) PA_READ24LE(x)
 125  #define PA_WRITE24RE(x,y) PA_WRITE24LE((x),(y))
 126 #else
 127  #define PA_INT16_FROM_LE(x) ((int16_t)(x))
 128  #define PA_INT16_FROM_BE(x) PA_INT16_SWAP(x)
 129
 130  #define PA_INT16_TO_LE(x) ((int16_t)(x))
 131  #define PA_INT16_TO_BE(x) PA_INT16_SWAP(x)
 132
 133  #define PA_UINT16_FROM_LE(x) ((uint16_t)(x))
 134  #define PA_UINT16_FROM_BE(x) PA_UINT16_SWAP(x)
 135
 136  #define PA_UINT16_TO_LE(x) ((uint16_t)(x))
 137  #define PA_UINT16_TO_BE(x) PA_UINT16_SWAP(x)
 138
 139  #define PA_INT32_FROM_LE(x) ((int32_t)(x))
 140  #define PA_INT32_FROM_BE(x) PA_INT32_SWAP(x)
 141
 142  #define PA_INT32_TO_LE(x) ((int32_t)(x))
 143  #define PA_INT32_TO_BE(x) PA_INT32_SWAP(x)
 144
 145  #define PA_UINT32_FROM_LE(x) ((uint32_t)(x))
 146  #define PA_UINT32_FROM_BE(x) PA_UINT32_SWAP(x)
 147
 148  #define PA_UINT32_TO_LE(x) ((uint32_t)(x))
 149  #define PA_UINT32_TO_BE(x) PA_UINT32_SWAP(x)
 150
 151  #define PA_FLOAT32_TO_LE(x) ((float) (x))
 152  #define PA_FLOAT32_TO_BE(x) PA_FLOAT32_SWAP(x)
 153
 154  #define PA_READ24NE(x) PA_READ24LE(x)
 155  #define PA_WRITE24NE(x,y) PA_WRITE24LE((x),(y))
 156
 157  #define PA_READ24RE(x) PA_READ24BE(x)
 158  #define PA_WRITE24RE(x,y) PA_WRITE24BE((x),(y))
 159 #endif
 160
 161 #endif