Class: PortAudioPort

Environment: Siren
Superclass: Siren.SoundPort
Category: MusicIO-Sound
Instance variables: rate format outChannels interface isOpen isRunning
bufferSize

A PortAudioPort is an interface to the external PortAudio library. It is simple, supports playback only, and does not use callbacks from C into Smalltalk. For a fancier version that supports input as well , see SmartAudioPort.

Instance Variables:
device the PortAudio device flag for my device
rate the sample rate in Hz
format sample format as in #lin16Bit
outChannels # of out channels
interface my low-level interface
isOpen am I open?
isRunning am I running?
bufferSize size of the preallocated IO buffers

Shared Variables:
Devices my total # of I/O channels and default I/O sample rates

open/close

close
Close the receiver sound port

open
Open the receiver sound port

start
Start the receiver sound port

stop
Stop the receiver sound port

terminate
Shut down the receiver.

accessing

format

format: aValue

outChannels

outChannels: aValue

rate

rate: aValue

initialize/release

initialize
Answer an initialized version of the receiver.

play/record

play: aSound
Play the argument on the receiver over the DACs.

play: aSound from: start to: stop
Play the argument on the receiver over the DACs.

MetaClass: PortAudioPort class

initialize/release

stop
Stop and close the running instance

examples

playSweep
Play a swept sine wave using the simple output-only port audio port.

playSweepLong
Play a *long* swept sine wave using the simple output-only port audio port.