iOS 4.3 and 5.0.
My app downloads (does not stream) audio files, and I want to be a good citizen
and not assume they are actually audio files until I've verified them. What I
can't do is this:
+ (BOOL) fileAtURLAppearsValid: (NSURL *) fileURL
{
AVURLAsset * localAsset;
localAsset = [AVURLAsset URLAssetWithURL: fileURL
options: nil];
return localAsset.readable && localAsset.playable;
}
because if the file is large, AVFoundation won't be able to examine it
synchronously.
And I'd like to have a synchronous check, even if it just means magic numbers
and a sane file size. The problems are that I don't know what the magic numbers
or sane sizes are; I don't necessarily have a filename extension; and I don't
even know in advance what formats AVFoundation will accept on the machine I'm
running on.
Is there a library or something that can give me a quick-and-dirty assessment
of an audio file?
— F
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