Re: Inconsistencies with large WAV file
Re: Inconsistencies with large WAV file
- Subject: Re: Inconsistencies with large WAV file
- From: Howard Moon <email@hidden>
- Date: Wed, 2 Dec 2009 07:52:59 -0800
In his most recent post, he stated that the expected value was
368,404,342 (commas added). Subtracting 60,672,553 (the reported
size, negative) from 4,294,967,296 (0x100000000) gives you
4,234,294,743, far greater than the expected value. I don't see any
obvious relation between the expected value and the reported value.
If you subtract the reported size (-60672553) from 0x100000000LL, is
it correct? I bet it is, which would point to a bug in our WAVE
parser (albeit one that should be fairly easily worked around).
On Nov 30, 2009, at 23:59 , tahome izwah wrote:
Hi all,
I am looking at a strange problem and don't know what I might be
doing
wrong. I am currently on 10.5.8 dealing with a 5 channel 16 bit
signed
int WAV file that is 3.52 GB in size, which was (successfully)
created
by our app using the ExtAudioFile API. The file plays fine in
QuickTime and the Finder preview.
Now if I do...
SInt64 nf=0;
propSize = sizeof(SInt64);
err = ExtAudioFileGetProperty(xafref,
kExtAudioFileProperty_FileLengthFrames, &propSize, &nf);
if (err) {
NSLog(@"error in ExtAudioFileGetProperty, %d", err);
ExtAudioFileDispose(xafref);
return err;
}
...to get the number of available frames in that file I am getting
back a value of -60672553 in nf, with no error. This causes my app to
refuse playing the file because it has an invalid length.
If I write the same content to a CAF file everything works fine.
How come that QuickTime can play the file, ExtAudioFile can create
and
write to it but that property reports back an incorrect file size?
That doesn't make any sense - is there another API call that I should
be using instead??
Thanks, I'm really pulling my hair out over this.
--th
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