net.java.sip.communicator.impl.neomedia.audiolevel
Class AudioLevelCalculator

java.lang.Object
  net.java.sip.communicator.impl.neomedia.audiolevel.AudioLevelCalculator

public class AudioLevelCalculator
extends Object

Author:

Damian Minkov, Lyubomir Marinov

Constructor Summary

AudioLevelCalculator()

Method Summary

static int	calculateSignalPowerLevel(byte[] samples, int offset, int length, int minLevel, int maxLevel, int lastLevel) Estimates the signal power and use the levelRatio to scale it to the needed levels.
static int	calculateSoundPressureLevel(byte[] samples, int offset, int length, int minLevel, int maxLevel, int lastLevel) Calculates the sound pressure level of a signal with specific samples and makes sure that it is expressed as a value in the range between minLevel and maxLevel.

Methods inherited from class java.lang.Object

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

Constructor Detail

AudioLevelCalculator

public AudioLevelCalculator()

Method Detail

calculateSignalPowerLevel

public static int calculateSignalPowerLevel(byte[] samples,
                                            int offset,
                                            int length,
                                            int minLevel,
                                            int maxLevel,
                                            int lastLevel)

Estimates the signal power and use the levelRatio to scale it to the needed levels.

Parameters:

samples - the samples of the signal to calculate the signal power level of

offset - the offset that data starts.

length - the length of the data

minLevel - the minimum value of the result

maxLevel - the maximum value of the result

lastLevel - the last level we calculated.

Returns:

the power of the signal in dB SWL.

calculateSoundPressureLevel

public static int calculateSoundPressureLevel(byte[] samples,
                                              int offset,
                                              int length,
                                              int minLevel,
                                              int maxLevel,
                                              int lastLevel)

Calculates the sound pressure level of a signal with specific samples and makes sure that it is expressed as a value in the range between minLevel and maxLevel.

Parameters:

samples - the samples of the signal to calculate the sound pressure level of

offset - the offset in samples in which the samples start

length - the length in bytes of the samples in samples starting at offset

minLevel - the minimum value of the level to be returned

maxLevel - the maximum value of the level to be returned

lastLevel - the last level which has been previously calculated

Returns:

the sound pressure level of the specified signal as a value in the range between minLevel and maxLevel