|Jan 15, 2009, 04:18 PM||#1|
Converting a number to IEEE Extended
I'm trying to read/write sample rate information from AIFF files and came across these two handy functions for converting to/from IEEE 80-bit Extended number format;
However, when I use the function the numbers don't come out right. For example, the bytes for a 44100Hz sample is (if you read it in a hex editor);
40 0D AC 44 00 00 00 00 00 00
ConvertToIeeeExtended((double)44100, (char *)byteBuffer);
40 0E AC 44 00 00 00 00 00 00
Or alternatively, is there a way of working with IEEE 80-bit Extended numbers in the iPhone API?
|Jan 15, 2009, 05:17 PM||#2|
Might have answered my own question. If you use a "double long" you can use a (char *) to access the first 10 bytes and it gives you the correct result, in reverse order.
As for the "error" I was seeing, it was in fact correct (so the function I found and linked to actually works too) - for some reason the audio properties of the file were being reported incorrectly in the sound editor I was using. Doh!
Last edited by neil.b; Jan 15, 2009 at 06:15 PM. Reason: Missed a bit
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