sound
Class AudioFormatUtils

java.lang.Object
  sound.AudioFormatUtils

public class AudioFormatUtils
extends java.lang.Object

Constructor Summary

AudioFormatUtils()

Method Summary

static double[]	bytesToSamples(byte[] byteArray, int offset, int length, int bytesPerSample, boolean signedData) Converts a byte array into an array of samples (a double).
static short[]	get16BitAudioData(javax.sound.sampled.AudioFormat format, byte[] audioBytes)
static javax.sound.sampled.AudioFormat	get44khzLinear16bitMonoSignedBigEndianFormat()
static javax.sound.sampled.AudioFormat	get8000Linear16bitMonoSignedBigEndianFormat()
static javax.sound.sampled.AudioFormat	get8khzMono8Format()
static javax.sound.sampled.AudioFileFormat.Type	getAudioFileType()
static javax.sound.sampled.AudioFormat	getCDLinearPcmFormat() Use 16 bit mono CD quality (44.1 khz sample rate with 16 bits per sample.
static javax.sound.sampled.AudioFormat	getDefaultAudioFormat()
static double[]	getDoubleData(javax.sound.sampled.AudioFormat format, byte[] audioBytes)
static javax.sound.sampled.AudioFileFormat.Type	getSourceType()
static boolean	isPcm(javax.sound.sampled.AudioFormat.Encoding encoding) Checks if the encoding is PCM.
static double[]	littleEndianBytesToSamples(byte[] data, int offset, int length, int bytesPerSample, boolean signed) Converts a little-endian byte array into an array of samples (double).

Methods inherited from class java.lang.Object

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

Constructor Detail

AudioFormatUtils

public AudioFormatUtils()

Method Detail

getCDLinearPcmFormat

public static javax.sound.sampled.AudioFormat getCDLinearPcmFormat()

Use 16 bit mono CD quality (44.1 khz sample rate with 16 bits per sample.

Returns:

signed linear pcm coded data. Big Endian format

getDefaultAudioFormat

public static javax.sound.sampled.AudioFormat getDefaultAudioFormat()

get8khzMono8Format

public static javax.sound.sampled.AudioFormat get8khzMono8Format()

Returns:

little endian 8khz linear 8bit format. Unsigned.

get8000Linear16bitMonoSignedBigEndianFormat

public static javax.sound.sampled.AudioFormat get8000Linear16bitMonoSignedBigEndianFormat()

get44khzLinear16bitMonoSignedBigEndianFormat

public static javax.sound.sampled.AudioFormat get44khzLinear16bitMonoSignedBigEndianFormat()

get16BitAudioData

public static short[] get16BitAudioData(javax.sound.sampled.AudioFormat format,
                                        byte[] audioBytes)

getDoubleData

public static double[] getDoubleData(javax.sound.sampled.AudioFormat format,
                                     byte[] audioBytes)

bytesToSamples

public static double[] bytesToSamples(byte[] byteArray,
                                      int offset,
                                      int length,
                                      int bytesPerSample,
                                      boolean signedData)
                               throws java.lang.ArrayIndexOutOfBoundsException

Converts a byte array into an array of samples (a double). Each consecutive bytes in the byte array are converted into a double, and becomes the next element in the double array. The size of the returned array is (length/bytesPerDouble). Currently, only 1 byte (8-bit) or 2 bytes (16-bit) samples are supported.

Parameters:

byteArray - a byte array

offset - which byte to start from

length - how many bytes to convert

bytesPerSample - the number of bytes per sample

signedData - whether the data is signed

Returns:

a double array, or null if byteArray is of zero length

Throws:

java.lang.ArrayIndexOutOfBoundsException - thrown only if you go off the end of the array

littleEndianBytesToSamples

public static double[] littleEndianBytesToSamples(byte[] data,
                                                  int offset,
                                                  int length,
                                                  int bytesPerSample,
                                                  boolean signed)
                                           throws java.lang.ArrayIndexOutOfBoundsException

Converts a little-endian byte array into an array of samples (double). Each consecutive bytes of a float are converted into a double, and becomes the next element in the double array. The number of bytes in the double is specified as an argument. The size of the returned array is (data.length/bytesPerSample).

Parameters:

data - a byte array

offset - which byte to start from

length - how many bytes to convert

bytesPerSample - the number of bytes per sample

signed - whether the data is signed

Returns:

a double array, or null if byteArray is of zero length

Throws:

java.lang.ArrayIndexOutOfBoundsException - this should not happen

getAudioFileType

public static javax.sound.sampled.AudioFileFormat.Type getAudioFileType()

isPcm

public static boolean isPcm(javax.sound.sampled.AudioFormat.Encoding encoding)

Checks if the encoding is PCM.

Parameters:

encoding - query the audio format

Returns:

encoding true if PCM Signed or Unsigned

getSourceType

public static javax.sound.sampled.AudioFileFormat.Type getSourceType()