Inside Macintosh: Sound

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