AudioReader

VisualSim.actor.lib.javasound
Class AudioReader

• public class AudioReader
• extends Source

• This actor outputs samples from a sound file as doubles in the range [-1.0, 1.0]. If the file has multiple channels of output data, then the separate channels are sent on successive output channels. If the output has more channels than there are channels in the audio file, then nothing will be send on the output channels where there is no corresponding output data.

The fileOrURL parameter should be set to the name of the file or a URL, in any form accepted by FileAttribute. The default initial value is $CLASSPATH/VisualSim/actor/lib/javasound/voice.wav, which refers to a file that is found relative to the classpath.

Supported file formats are WAV, AU, and AIFF. The sound file format is determined from the file extension.

When the end of the file is reached, postfire() return false, which in some simulators will cause the model to stop executing (e.g. SDF), and in some will prevent further firings of this actor (e.g. DE).

There are security issues involved with accessing files and audio resources in applets. Applets are only allowed access to files specified by a URL and located on the machine from which the applet is loaded. The .java.policy file may be modified to grant applets more privileges.

Note: Requires Java 2 v1.3.0 or later.

See Also:

• VisualSim.media.javasound.LiveSound
• SoundWriter
• SoundPlayback
•  

fileOrURL

public FileAttribute fileOrURL

• The file name or URL from which to read. This is a string with any form accepted by FileAttribute.

• See Also:
• FileAttribute

_audioIn

private double[][] _audioIn

• Most recently read audio data.

_audioSendArray

private DoubleToken[][] _audioSendArray

• Buffer of tokens to send.

_channels

private int _channels

• The number of channels.

_firedSinceWrapup

private boolean _firedSinceWrapup

• Indicator that the fire() method has been called, but wrapup has not. That is, we are in the middle of a run.

_previousFileOrURL

private String _previousFileOrURL

• Previous value of fileOrURL parameter.

_reachedEOF

private boolean _reachedEOF

• Indicator that we have reached the end of the file.

_sampleIndex

private int _sampleIndex

• Index of the next output to produce from _audioIn.

_soundReader

private SoundReader _soundReader

• The current reader for the input file.

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