Package org.jamdev.jpamutils.wavFiles

Class AudioData

java.lang.Object

org.jamdev.jpamutils.wavFiles.AudioData

public class AudioData
extends Object

Holds .wav file data.

Author:

Jamie Macaulay

Field Summary

Fields

Modifier and Type	Field	Description
double	bitRate	The bit rate of samples
PreEmphasisFilter	preEmphasisFilter	Pre-emphasis filter.
float	sampleRate	The sample rate in samples per second
int[]	samples	Samples in amplitude units u.
WavInterpolator	wavInterpolator	Interpolator for wav files.

Constructor Summary

Constructors

Constructor	Description
AudioData(double[] wavArray, float sampleRate)	Create an AudioData object.
AudioData(int[] samples, float sampleRate)	Create an AudioData object.
AudioData(short[] samples, float sampleRate)	Create an AudioData object.

Method Summary

Modifier and Type	Method	Description
double	getLengthInSeconds()	Get the length in seconds.
int[]	getSampleAmplitudes()	Get the sample amplitudes in raw bits e.g.
float	getSampleRate()	Get the sample rate in samples per second.
double[]	getScaledSampleAmpliudes()	Get the sample amplitudes as a double scaled between -1 and 1.
AudioData	interpolate(float interpSr)	Interpolate the audio data (e..g up sample or down sample)
AudioData	preEmphasis(double factor)	Pre-emphasise the audio data so that lower frequencies are attenuated
static int[]	short2Int(short[] samples)	Convert a short[] array to int[].
AudioData	trim(int sampleStart, int samplEnd)	Trim the audio data between two sample indexes.

Methods inherited from class java.lang.Object

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

Field Details

wavInterpolator

public WavInterpolator wavInterpolator

Interpolator for wav files.

preEmphasisFilter

public PreEmphasisFilter preEmphasisFilter

Pre-emphasis filter.

samples

public int[] samples

Samples in amplitude units u.

sampleRate

public float sampleRate

The sample rate in samples per second

bitRate

public double bitRate

The bit rate of samples

Constructor Details

AudioData

public AudioData(int[] samples, float sampleRate)

Create an AudioData object.

Parameters:

samples - - the samples in amplitude units u.

sampleRate - - the sample rate in samples per second.

AudioData

public AudioData(short[] samples, float sampleRate)

Create an AudioData object.

Parameters:

samples - - the samples in amplitude units u.

sampleRate - - the sample rate in samples per second.

AudioData

public AudioData(double[] wavArray, float sampleRate)

Create an AudioData object.

Parameters:

samples - - the samples in linear amplitude units - 1 to 1

sampleRate - - the sample rate in samples per second.

Method Details

getSampleRate

public float getSampleRate()

Get the sample rate in samples per second.

Returns:

the sample rate in samples per second.

getSampleAmplitudes

public int[] getSampleAmplitudes()

Get the sample amplitudes in raw bits e.g. +/- 2^16 /2 for 16 bit files.

Returns:

the sample amplitudes

getLengthInSeconds

public double getLengthInSeconds()

Get the length in seconds.

Returns:

the length of the file in seconds

getScaledSampleAmpliudes

public double[] getScaledSampleAmpliudes()

Get the sample amplitudes as a double scaled between -1 and 1.

Returns:

the scaled amplitude samples.

trim

public AudioData trim(int sampleStart, int samplEnd)

Trim the audio data between two sample indexes.

Parameters:

sampleStart - - the sample start.

samplEnd - - the sample end.

Returns:

AudioData object with trimmed data.

interpolate

public AudioData interpolate(float interpSr)

Interpolate the audio data (e..g up sample or down sample)

Parameters:

interpSr - - the new sample rate.

Returns:

AudioData object containing interpolated data and sample rate.

preEmphasis

public AudioData preEmphasis(double factor)

Pre-emphasise the audio data so that lower frequencies are attenuated

Parameters:

factor - - the pre-emphasis factor

Returns:

AudioData object with pre emphasised data.

short2Int

public static int[] short2Int(short[] samples)

Convert a short[] array to int[].

Parameters:

samples - - the short samples

Returns:

the integer array containing the same data.