micromod
Class LoopDecoder

java.lang.Object
  micromod.LoopDecoder

public class LoopDecoder

extends java.lang.Object

LoopDecoder streams the samples of an instrument in the correct order. Because looping is done independently of anything else, it makes bidi loops etc. easy to do, and fast, because the loop can be made tight. This implementation is rather strange, because in order to emulate a widely used quirk of ProTracker, an Instrument can be assigned to the decoder while another one is playing. The assigned instrument will be triggered automatically by the decoder depending upon certain conditions.

Field Summary

protected Instrument	assigned
protected Instrument	instrument
protected int	samplePos

Constructor Summary

LoopDecoder()
Constructor

Method Summary

void	assignInstrument(Instrument inst) Assign an Instrument to the decoder.
boolean	finishedPlaying()
Instrument	getInstrument()
int	getSamplePosition()
void	output(short[] buffer, int offset, int length, boolean snapBack) Output looped(or not) audio into buffer.
void	setAssigned() Switch to the assigned instrument
void	setSamplePosition(int samplePosition) Set the sample position of playback.
protected static void	zero(short[] buffer, int start, int end)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

instrument

protected Instrument instrument

assigned

protected Instrument assigned

samplePos

protected int samplePos

Constructor Detail

LoopDecoder

public LoopDecoder()

Constructor

Method Detail

assignInstrument

public void assignInstrument(Instrument inst)

Assign an Instrument to the decoder.

setAssigned

public void setAssigned()

Switch to the assigned instrument

getInstrument

public Instrument getInstrument()

Returns:

The Instrument currently being decoded

finishedPlaying

public boolean finishedPlaying()

Returns:

true if the Instrument has finished playback.

setSamplePosition

public void setSamplePosition(int samplePosition)

Set the sample position of playback. If out of range, a sensible position will be chosen.

getSamplePosition

public int getSamplePosition()

Returns:

The current sample position.

output

public void output(short[] buffer,
                   int offset,
                   int length,
                   boolean snapBack)

Output looped(or not) audio into buffer.

Parameters:

snapBack - if true, the sample position will not be updated.

zero

protected static void zero(short[] buffer,
                           int start,
                           int end)