Inside Macintosh: Sound

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Sound Manager Routines

This section describes the routines provided by the Sound Manager. You can use these routines to

• play sound resources
• play sounds stored in files directly from disk
• allocate and release sound channels
• send commands to a sound channel
• obtain information about the Sound Manager, a sound channel, all sound channels, or the system alert sound's status
• compress and expand audio data
• manage the reading and writing of double sound buffers

The section "Application-Defined Routines" describes routines that your application might need to define, including callback procedures, completion routines, and doubleback procedures.

Assembly-Language Note

Most Sound Manager routines are accessed through the _SoundDispatch selector. However, the SndAddModifier , SndControl , SndDisposeChannel , SndDoCommand , SndDoImmediate , SndNewChannel , and SndPlay functions and the SysBeep procedure are accessed through their own trap macros.

Playing Sound Resources

Playing From Disk

Allocating and Releasing Sound Channels

Sending Commands to a Sound Channel

Obtaining Information

Controlling Volume Levels

Compressing and Expanding Audio Data

Managing Double Buffers

Performing Unsigned Fixed-Point Arithmetic

Linking Modifiers to Sound Channels

Inside Macintosh: Sound

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