Mac OS Sound

Interface Changes

In Sound Manager 3.3, SoundInput.h and SoundComponents.h have been merged into Sound.h. The contents of the two former interface files are now empty; all sound interfaces have been moved to Sound.h.

Previously defined in SoundComponents.h were a set of component sub-types used in the 'thng' resource of an audio codec. This OSType was matched with a given sound's format, which determined the codec necessary to support the given sound.

Unfortunately, the usage of these constants was not obvious to many and are required as the value set in the format parameter of the functions GetCompressionInfo , GetCompressionName , SetupSndHeader , and SetupAIFFHeader , and in the CmpSoundHeader , SndDoubleBufferHeader2 , CompressionInfo and SoundComponentData structures. A new set of constants has been created to replace these, along with the addition of the recently supported formats. These are shown in Table 4-1 .

Table 4-1 A new set of constants, replacing old constants
New Constants	Old Constants
kSoundNotCompressed
k8BitOffsetBinaryFormat	kOffsetBinary
kMACE3Compression	kMace3SubType
kMACE6Compression	kMace6SubType
kIMACompression	kIMA4SubType
kULawCompression	kULawSubType
kALawCompression
kFloat32Format
kFloat64Format
k24BitFormat
k32BitFormat
k16BitBigEndianFormat	kTwosComplement
k16BitLittleEndianFormat	kLittleEndianSubType
kMicrosoftADPCMFormat
kDVIIntelIMAFormat
kDVAudioFormat