org.jitsi.impl.neomedia.codec.audio.alaw

Class JavaEncoder

java.lang.Object

net.sf.fmj.media.BasicPlugIn

net.sf.fmj.media.BasicCodec

com.sun.media.BasicCodec

com.ibm.media.codec.audio.AudioCodec

org.jitsi.impl.neomedia.codec.audio.alaw.JavaEncoder

All Implemented Interfaces:

javax.media.Codec, javax.media.Controls, javax.media.PlugIn

public class JavaEncoder
extends com.ibm.media.codec.audio.AudioCodec

The ALAW Encoder. Used the FMJ ALawEncoderUtil.

Author:

Damian Minkov

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX maximum that can be held in 15 bits
static int	MAX_USHORT 65535

Fields inherited from class com.ibm.media.codec.audio.AudioCodec

DEBUG, defaultOutputFormats, inputFormat, outputFormat, PLUGIN_NAME, supportedInputFormats, supportedOutputFormats

Fields inherited from class net.sf.fmj.media.BasicCodec

inputFormats, opened, outputFormats, pendingEOM

Fields inherited from class net.sf.fmj.media.BasicPlugIn

controls

Fields inherited from interface javax.media.PlugIn

BUFFER_PROCESSED_FAILED, BUFFER_PROCESSED_OK, INPUT_BUFFER_NOT_CONSUMED, OUTPUT_BUFFER_NOT_FILLED, PLUGIN_TERMINATED

Constructor Summary

Constructors

Constructor and Description
JavaEncoder() Constructs the encoder and init the supported formats.

Method Summary

Modifier and Type	Method and Description
static void	aLawEncode(boolean bigEndian, byte[] data, int offset, int length, byte[] target) Encode an array of pcm values into a pre-allocated target array
static byte	aLawEncode(int pcm) Encode a pcm value into a a-law byte
static void	aLawEncodeBigEndian(byte[] data, int offset, int length, byte[] target) Encode big endian data.
static void	aLawEncodeLittleEndian(byte[] data, int offset, int length, byte[] target) Encode little endian data.
void	close() No resources used to be cleared.
protected javax.media.Format[]	getMatchingOutputFormats(javax.media.Format in) Returns the output formats according to the input.
void	open() No resources to be opened.
int	process(javax.media.Buffer inputBuffer, javax.media.Buffer outputBuffer) Encodes the input buffer passing it to the output one
static int	uShortToInt(short value) Unsigned short to integer.

Methods inherited from class com.ibm.media.codec.audio.AudioCodec

checkFormat, getInputFormat, getName, getOutputFormat, getSupportedInputFormats, getSupportedOutputFormats, setInputFormat, setOutputFormat

Methods inherited from class net.sf.fmj.media.BasicCodec

checkEOM, checkInputBuffer, getArrayElementSize, isEOM, processAtEOM, propagateEOM, reset, updateOutput, updateRGBFormat

Methods inherited from class net.sf.fmj.media.BasicPlugIn

error, getClassForName, getControl, getControls, getInputData, getNativeData, getOutputData, matches, plugInExists, validateByteArraySize, validateData, validateIntArraySize, validateShortArraySize

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.media.Controls

getControl, getControls

Field Detail

MAX

public static final int MAX

maximum that can be held in 15 bits

See Also:

Constant Field Values

MAX_USHORT

public static final int MAX_USHORT

65535

See Also:

Constant Field Values

Constructor Detail

JavaEncoder

public JavaEncoder()

Constructs the encoder and init the supported formats.

Method Detail

getMatchingOutputFormats

protected javax.media.Format[] getMatchingOutputFormats(javax.media.Format in)

Returns the output formats according to the input.

Overrides:

getMatchingOutputFormats in class com.ibm.media.codec.audio.AudioCodec

Parameters:

in - the input format.

Returns:

the possible output formats.

open

public void open()
          throws javax.media.ResourceUnavailableException

No resources to be opened.

Specified by:

open in interface javax.media.PlugIn

Overrides:

open in class net.sf.fmj.media.BasicCodec

Throws:

javax.media.ResourceUnavailableException - if open failed (which cannot happend for this codec since no resources are to be opened)

close

public void close()

No resources used to be cleared.

Specified by:

close in interface javax.media.PlugIn

Overrides:

close in class net.sf.fmj.media.BasicCodec

process

public int process(javax.media.Buffer inputBuffer,
                   javax.media.Buffer outputBuffer)

Encodes the input buffer passing it to the output one

Parameters:

inputBuffer - Buffer

outputBuffer - Buffer

Returns:

int

uShortToInt

public static int uShortToInt(short value)

Unsigned short to integer.

Parameters:

value - unsigned short.

Returns:

integer.

aLawEncode

public static void aLawEncode(boolean bigEndian,
                              byte[] data,
                              int offset,
                              int length,
                              byte[] target)

Encode an array of pcm values into a pre-allocated target array

Parameters:

bigEndian - the data byte order.

data - An array of bytes in Little-Endian format

target - A pre-allocated array to receive the A-law bytes. This array must be at least half the size of the source.

offset - of the input.

length - of the input.

aLawEncodeLittleEndian

public static void aLawEncodeLittleEndian(byte[] data,
                                          int offset,
                                          int length,
                                          byte[] target)

Encode little endian data.

Parameters:

data - the input data.

offset - the input offset.

length - the input length.

target - the target array to fill.

aLawEncodeBigEndian

public static void aLawEncodeBigEndian(byte[] data,
                                       int offset,
                                       int length,
                                       byte[] target)

Encode big endian data.

Parameters:

data - the input data.

offset - the input offset.

length - the input length.

target - the target array to fill.

aLawEncode

public static byte aLawEncode(int pcm)

Encode a pcm value into a a-law byte

Parameters:

pcm - A 16-bit pcm value

Returns:

A a-law encoded byte