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check if macros is already defined

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git-svn-id: svn+ssh://svn.savannah.nongnu.org/linphone/trunk@797 3f6dc0c8-ddfe-455d-9043-3cd528dc4637
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aymeric 2010-01-01 18:09:14 +00:00
parent 57ed9f670c
commit 9a503e386e
1 changed files with 6 additions and 0 deletions
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6
linphone/mediastreamer2/include/mediastreamer2/waveheader.h
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@ -27,17 +27,23 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#ifndef waveheader_h
#define waveheader_h
#ifdef swap16
#else
/* all integer in wav header must be read in least endian order */
static inline uint16_t swap16(uint16_t a)
{
return ((a & 0xFF) << 8) | ((a & 0xFF00) >> 8);
}
#endif
#ifdef swap32
#else
static inline uint32_t swap32(uint32_t a)
{
return ((a & 0xFF) << 24) | ((a & 0xFF00) << 8) |
((a & 0xFF0000) >> 8) | ((a & 0xFF000000) >> 24);
}
#endif
#ifdef WORDS_BIGENDIAN
#define le_uint32(a) (swap32((a)))