fr.paris.lutece.plugins.captcha.modules.jcaptcha.service.sound.filter
Class EchoFilter
java.lang.Object
fr.paris.lutece.plugins.captcha.modules.jcaptcha.service.sound.filter.SoundFilter
fr.paris.lutece.plugins.captcha.modules.jcaptcha.service.sound.filter.EchoFilter
public class EchoFilter
- extends SoundFilter
Constructor Summary |
EchoFilter(float echoDelay,
float decay)
Creates an EchoFilter with the specified number of delay samples and the
specified decay rate. |
Method Summary |
void |
filter(byte[] samples,
int offset,
int length,
int sampleSizeInBits)
Filters the sound samples to add an echo. |
int |
getRemainingSize()
Gets the remaining size, in bytes, of samples that this filter can echo
after the sound is done playing. |
void |
reset()
Clears this EchoFilter's internal delay buffer. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
EchoFilter
public EchoFilter(float echoDelay,
float decay)
- Creates an EchoFilter with the specified number of delay samples and the
specified decay rate.
The number of delay samples specifies how long before the echo is
initially heard. For a 1 second echo with mono, 44100Hz sound, use 44100
delay samples.
The decay value is how much the echo has decayed from the source. A decay
value of .5 means the echo heard is half as loud as the source.
- Parameters:
echoDelay
- the echoDelaydecay
- the decay
getRemainingSize
public int getRemainingSize()
- Gets the remaining size, in bytes, of samples that this filter can echo
after the sound is done playing. Ensures that the sound will have decayed
to below 1% of maximum volume (amplitude).
- Overrides:
getRemainingSize
in class SoundFilter
- Returns:
- the Remaining Size
reset
public void reset()
- Clears this EchoFilter's internal delay buffer.
- Overrides:
reset
in class SoundFilter
filter
public void filter(byte[] samples,
int offset,
int length,
int sampleSizeInBits)
- Filters the sound samples to add an echo. The samples played are added to
the sound in the delay buffer multipied by the decay rate. The result is
then stored in the delay buffer, so multiple echoes are heard.
- Specified by:
filter
in class SoundFilter
- Parameters:
samples
- the samplesoffset
- the offsetlength
- the lengthsampleSizeInBits
- the sample size in bits
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