src/pcm_byteswap.c

   1 /*
   2  * Copyright (C) 2003-2009 The Music Player Daemon Project
   3  * http://www.musicpd.org
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include "pcm_byteswap.h"
  21 #include "pcm_buffer.h"
  22
  23 #include <glib.h>
  24
  25 #include <assert.h>
  26
  27 #undef G_LOG_DOMAIN
  28 #define G_LOG_DOMAIN "pcm"
  29
  30 static inline uint16_t swab16(uint16_t x)
  31 {
  32         return (x << 8) | (x >> 8);
  33 }
  34
  35 const int16_t *pcm_byteswap_16(struct pcm_buffer *buffer,
  36                                const int16_t *src, size_t len)
  37 {
  38         unsigned i;
  39         int16_t *buf = pcm_buffer_get(buffer, len);
  40
  41         assert(buf != NULL);
  42
  43         for (i = 0; i < len / 2; i++)
  44                 buf[i] = swab16(src[i]);
  45
  46         return buf;
  47 }
  48
  49 static inline uint32_t swab32(uint32_t x)
  50 {
  51         return (x << 24) |
  52                 ((x & 0xff00) << 8) |
  53                 ((x & 0xff0000) >> 8) |
  54                 (x >> 24);
  55 }
  56
  57 const int32_t *pcm_byteswap_32(struct pcm_buffer *buffer,
  58                                const int32_t *src, size_t len)
  59 {
  60         unsigned i;
  61         int32_t *buf = pcm_buffer_get(buffer, len);
  62
  63         assert(buf != NULL);
  64
  65         for (i = 0; i < len / 4; i++)
  66                 buf[i] = swab32(src[i]);
  67
  68         return buf;
  69 }