Support and General Use > Recording

Recorded AIFF shows as AIFC

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jhMikeS:
I don't know what MacOS will come up with if it sees a float in a form other than what it expects even if technically correct. It's the only thing I can think of that could be off since all the other data is just integers and the conversion is based on the IEEE standard + CoolEdit as a reference. I've just gotta see about subtracting one from the exponent and shifting the mantissa left by one. Maybe it'll do the trick.

Can you attach the header+something (first say, 200-300 bytes) of an AIFF MacOS recognizes correctly. Be sure it's 44100Hz Stereo as a reference. Can be binary form. Just post the original file's exact size in bytes in your reply.

jhMikeS:
Well, 2822 could be the case if you record at 88.2Khz (x5) or 1536 if you record optical in at 48Khz (H120). Is it me or did I not see any details on the player and intended output?

Llorean:
If I recall he's an H100 user, or was in the past at least (people do upgrade, apparently). I forgot about 48khz from Optical though.

jhMikeS:
The long to float seems right. I can divide the mantissa by powers of two and increase the exponent accordingly and get the same samplerate but going the other way loses the left-justified 1 bit (which is always the highest order 1 bit in the integer form) and the wrong rate is read out on my PC (11332Hz). Sources seemed ambiguous about whether or not the h.o. '1' can be implied. It didn't seem so with IEEE754 extended but only with the smaller float sizes. Must be something else. Won't continue to bore everyone.  ;D Still wanna see a sample header that MacOS shows correctly.

EDIT: Have to mention that 44100Hz 16bit Stereo PCM _is_ actually 1411.2Kbps... ::)

mlind:
OK...

iTunes (from Apple) says AIFF 1411 kbps.
Quicktime (from Apple) actually doesn't state the file format but says these (seven) particular files from the same recording is varying from 1410,76 to 1417,78 kbps... must be a value calculated in some stupid way.
Logic Pro (from Apple) has no trouble opening and using the files.
Waveburner (from Apple) says AIFF and has no trouble opening and using the files.

But still Mac OS X (10.4.8) says AIFC...

I opened one of the files in the program "File Buddy".
For every file there is a "Type" and a "Creator" - these can be changed by File Buddy.
There is also a presentation of what icon will be used, and beside that a label of the file type.

File Buddy said "Type:AIFF" & "Creator:no creator"
At the same time there was the label "AIFC" beside the icon (for an AIFC).
I changed Type & Creator to match another aiff I had on my computer.
The label beside the icon changed to AIFF.

Then I changed "Creator" back to "no creator" wich resulted in the label & icon changing back to AIFC. ???

I attached an AIFF made with iTunes. It's me saying "Hi" in swedish.



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