AudioFormat property kAudioFormatProperty_ASBDFromMPEGPacket bug fix for macOS 10.12 (Sierra) and iOS 10.0

The Audio Format Property Identifier

kAudioFormatProperty_ASBDFromMPEGPacket

is documented as returning a

AudioStreamBasicDescription

for a given MPEG Packet where the specifier is an MPEG Packet.

In versions of OS X and iOS prior to macOS 10.12 (Sierra) and iOS 10.0, the

inSpecifier

to

AudioFormatGetProperty()

for

kAudioFormatProperty_ASBDFromMPEGPacket

was being interpreted as a 4-byte MPEG audio sync word passed by value, rather than what you would expect to pass to this API, a pointer to a full packet.

This issue has been fixed. Developers using this property on older systems should note this behavior change and update their code as required.