Re: problem with [NSData bytes] on Intel
Re: problem with [NSData bytes] on Intel
- Subject: Re: problem with [NSData bytes] on Intel
- From: john <email@hidden>
- Date: Mon, 6 Feb 2006 18:18:28 -0500
Hi,
Doug was correct on this issue. It was audio related, and although I
didn't need to swap the bytes manually I wasn't specifying the audio
format (from CoreAudio) correctly so I was getting this problem which
seemed rather confusing at the time :)
-- John
Er, I'm not sure I'm interpreting you correctly ... but it does
sound like John's problem could be endian-related.
If you have an NSData containing floats that came from an opposite-
endian processor, you have to swap them, e.g.
NSData *bigEndianFloats = ...;
const UInt32 *ptr = [bigEndianFloats bytes];
UInt32 temp = EndianU32_BtoN(ptr[0]);
Float32 firstFloat = *(Float32 *)&temp;
HTH,
Doug
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