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 2.1 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_READ24BE(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_READ24LE(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_WRITE24BE(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_WRITE24LE(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