src/pcm_byteswap.c

   1 /*
   2  * Copyright (C) 2003-2010 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 "config.h"
  21 #include "pcm_byteswap.h"
  22 #include "pcm_buffer.h"
  23
  24 #include <glib.h>
  25
  26 #include <assert.h>
  27
  28 #undef G_LOG_DOMAIN
  29 #define G_LOG_DOMAIN "pcm"
  30
  31 static inline uint16_t swab16(uint16_t x)
  32 {
  33         return (x << 8) | (x >> 8);
  34 }
  35
  36 const int16_t *pcm_byteswap_16(struct pcm_buffer *buffer,
  37                                const int16_t *src, size_t len)
  38 {
  39         unsigned i;
  40         int16_t *buf = pcm_buffer_get(buffer, len);
  41
  42         assert(buf != NULL);
  43
  44         for (i = 0; i < len / 2; i++)
  45                 buf[i] = swab16(src[i]);
  46
  47         return buf;
  48 }
  49
  50 static inline uint32_t swab32(uint32_t x)
  51 {
  52         return (x << 24) |
  53                 ((x & 0xff00) << 8) |
  54                 ((x & 0xff0000) >> 8) |
  55                 (x >> 24);
  56 }
  57
  58 const int32_t *pcm_byteswap_32(struct pcm_buffer *buffer,
  59                                const int32_t *src, size_t len)
  60 {
  61         unsigned i;
  62         int32_t *buf = pcm_buffer_get(buffer, len);
  63
  64         assert(buf != NULL);
  65
  66         for (i = 0; i < len / 4; i++)
  67                 buf[i] = swab32(src[i]);
  68
  69         return buf;
  70 }