su.plo.voice.api.util

Class AudioUtil

java.lang.Object

su.plo.voice.api.util.AudioUtil

public final class AudioUtil
extends java.lang.Object

Method Summary

Modifier and Type	Method and Description
static double	audioLevelToDoubleRange(double audioLevel) Converts the audio level to double in range [0, 1]
static short	bytesToShort(byte b1, byte b2) Converts two bytes to one short
static short[]	bytesToShorts(byte[] bytes) Converts bytes to shorts
static double	calculateAudioLevel(byte[] samples, int offset, int length) Calculates the audio level
static double	calculateAudioLevel(short[] samples, int offset, int length) Calculates the audio level
static double	calculateAudioLevelFromRMS(double rms, int sampleCount) Calculates the audio level from RMS and samples count
static double	calculateHighestAudioLevel(short[] samples) Gets the highest audio level in the samples
static boolean	containsMinAudioLevel(byte[] samples, double minAudioLevel) Checks if any sample audio level greater than the min audio level
static boolean	containsMinAudioLevel(short[] samples, double minAudioLevel) Checks if any sample audio level greater than the min audio level
static byte[]	convertToMonoBytes(short[] samples) Converts stereo samples to mono bytes
static short[]	convertToMonoShorts(short[] samples) Converts stereo samples to mono shorts
static float	dbToMul(float db)
static double	doubleRangeToAudioLevel(double value) Converts the double in range [0, 1] to audio level
static short[]	floatsToShorts(float[] floats) Converts floats to shorts
static float	gainCoefficient(int sampleRate, float time)
static short	getHighestAbsoluteSample(short[] samples) Gets the highest absolute sample
static float	mulToDB(float mul)
static byte[]	shortsToBytes(short[] shorts) Converts shorts to bytes
static float[]	shortsToFloats(short[] input) Converts shorts to float
static byte[]	shortToBytes(short s) Converts one short to two byte

Methods inherited from class java.lang.Object

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

Method Detail

bytesToShorts

public static short[] bytesToShorts(byte[] bytes)

Converts bytes to shorts

Returns:

short array

shortsToBytes

public static byte[] shortsToBytes(short[] shorts)

Converts shorts to bytes

Returns:

byte array

bytesToShort

public static short bytesToShort(byte b1,
                                 byte b2)

Converts two bytes to one short

Returns:

short

shortToBytes

public static byte[] shortToBytes(short s)

Converts one short to two byte

Returns:

byte array

floatsToShorts

public static short[] floatsToShorts(float[] floats)

Converts floats to shorts

Returns:

the shorts

shortsToFloats

public static float[] shortsToFloats(short[] input)

Converts shorts to float

Returns:

the floats

containsMinAudioLevel

public static boolean containsMinAudioLevel(byte[] samples,
                                            double minAudioLevel)

Checks if any sample audio level greater than the min audio level

Returns:

return true if any sample audio level greater than the min audio level

containsMinAudioLevel

public static boolean containsMinAudioLevel(short[] samples,
                                            double minAudioLevel)

Checks if any sample audio level greater than the min audio level

Returns:

return true if any sample audio level greater than the min audio level

calculateAudioLevel

public static double calculateAudioLevel(byte[] samples,
                                         int offset,
                                         int length)

Calculates the audio level

Parameters:

samples - the samples

offset - offset from the start of the samples array

length - count of samples to process the calculation

Returns:

the audio level

calculateAudioLevel

public static double calculateAudioLevel(short[] samples,
                                         int offset,
                                         int length)

Calculates the audio level

Parameters:

samples - the samples

offset - offset from the start of the samples array

length - count of samples to process the calculation

Returns:

the audio level

calculateAudioLevelFromRMS

public static double calculateAudioLevelFromRMS(double rms,
                                                int sampleCount)

Calculates the audio level from RMS and samples count

Parameters:

rms - root mean square

sampleCount - count of samples

Returns:

the audio level

calculateHighestAudioLevel

public static double calculateHighestAudioLevel(short[] samples)

Gets the highest audio level in the samples

Parameters:

samples - the samples

Returns:

the highest audio level

audioLevelToDoubleRange

public static double audioLevelToDoubleRange(double audioLevel)

Converts the audio level to double in range [0, 1]

Returns:

the double in range [0, 1]

doubleRangeToAudioLevel

public static double doubleRangeToAudioLevel(double value)

Converts the double in range [0, 1] to audio level

Returns:

the audio level

convertToMonoBytes

public static byte[] convertToMonoBytes(short[] samples)

Converts stereo samples to mono bytes

convertToMonoShorts

public static short[] convertToMonoShorts(short[] samples)

Converts stereo samples to mono shorts

getHighestAbsoluteSample

public static short getHighestAbsoluteSample(short[] samples)

Gets the highest absolute sample

mulToDB

public static float mulToDB(float mul)

dbToMul

public static float dbToMul(float db)

gainCoefficient

public static float gainCoefficient(int sampleRate,
                                    float time)