These changes prevent a crash caused by casting [AVMetadataItem key] to an NSString without checking the type first.
[AVMetadataItem key] is defined as id<NSObject, NSCopying> since it can be a type other than NSString.
I'm witnessing crashes in v1.12.0 due to [AVMetadataItem key] returning an NSNumber and the line [keyString hasPrefix:MUXSessionDataPrefix] throws an unrecognized selector sent to instance exception.
These changes check that [AVMetadataItem key] is an NSString before casting to it.
These changes prevent a crash caused by casting
[AVMetadataItem key]to anNSStringwithout checking the type first.[AVMetadataItem key]is defined asid<NSObject, NSCopying>since it can be a type other thanNSString.I'm witnessing crashes in v1.12.0 due to
[AVMetadataItem key]returning anNSNumberand the line[keyString hasPrefix:MUXSessionDataPrefix]throws anunrecognized selector sent to instanceexception.These changes check that
[AVMetadataItem key]is anNSStringbefore casting to it.