com.neoworks.mpeg
Class MPEGFrame

java.lang.Object
  |
  +--com.neoworks.mpeg.MPEGFrame

public final class MPEGFrame

extends java.lang.Object

This class represents an MPEG frame. MPEG frames contain a header, compressed audio data and an optional checksum.

Author:

Nigel Atkinson (nigel@neoworks.com)

, micah

Field Summary

static int	DUAL_CHANNEL Frame mode constant
static int	FOURTYEIGHT Sample rate constant
static int	FOURTYFOUR_POINT_ONE Samole rate constant
static int[][]	frequencies Sample rate lookup table
static int	JOINT_STEREO Frame mode constant
static int	MPEG1 Constant for MPEG-1 version
static int	MPEG2 Constant for MPEG-2 version
static int	SINGLE_CHANNEL Frame mode constant
static int	STEREO Frame mode constant
static int	THIRTYTWO Sample rate constant

Constructor Summary

MPEGFrame(int headerstring)
Public constructor

Method Summary

int	getBitrate() Get the frame bitrate in bytes/second
java.lang.String	getBitrateString() Get a description of the frame bitrate
short	getCRCChecksum() Get the CRC checksum for this frame
byte[]	getFrameData() Get the entire frame as a byte array
int	getFrameSize() Get the frame size in bytes (including the header bytes)
int	getFrequency() Get the smaple frequency of the frame data
int	getIntensityStereoBound() Get the intensity stereo bound
java.lang.String	getLayerString() Get a description of the MPEG layer
int	getModeExtension() Get the stereo mode extension if any
java.lang.String	getModeString() Get a description of the mode
int	getMPEGLayer() Get the MPEG layer
int	getMPEGVersion() Get the MPEG version
int	getNumberOfSubbands() Get the number of sub bands
java.lang.String	getSampleFrequencyString() Get a description of the frame sample rate
int	getSlots() Get the number of audio data slots in this frame
boolean	hasPadding() Is the frame padded?
boolean	isCRCProtected() Get the CRC protection indicator bit.
java.lang.String	toString() Get a human readable representation of this header

Methods inherited from class java.lang.Object

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

Field Detail

frequencies

public static final int[][] frequencies

Sample rate lookup table

MPEG1

public static final int MPEG1

Constant for MPEG-1 version

See Also:

Constant Field Values

MPEG2

public static final int MPEG2

Constant for MPEG-2 version

See Also:

Constant Field Values

STEREO

public static final int STEREO

Frame mode constant

See Also:

Constant Field Values

JOINT_STEREO

public static final int JOINT_STEREO

Frame mode constant

See Also:

Constant Field Values

DUAL_CHANNEL

public static final int DUAL_CHANNEL

Frame mode constant

See Also:

Constant Field Values

SINGLE_CHANNEL

public static final int SINGLE_CHANNEL

Frame mode constant

See Also:

Constant Field Values

FOURTYFOUR_POINT_ONE

public static final int FOURTYFOUR_POINT_ONE

Samole rate constant

See Also:

Constant Field Values

FOURTYEIGHT

public static final int FOURTYEIGHT

Sample rate constant

See Also:

Constant Field Values

THIRTYTWO

public static final int THIRTYTWO

Sample rate constant

See Also:

Constant Field Values

Constructor Detail

MPEGFrame

public MPEGFrame(int headerstring)
          throws CorruptMPEGHeaderException

Public constructor

Parameters:

headerstring - The four header bytes

Throws:

CorruptMPEGHeaderException - If the header can not be parsed

Method Detail

getMPEGVersion

public int getMPEGVersion()

Get the MPEG version

Returns:

0 = version 2 (or 2.5), 1 = version 1

getMPEGLayer

public int getMPEGLayer()

Get the MPEG layer

Returns:

An int between 1 and 3 indicating the layer

getFrequency

public int getFrequency()

Get the smaple frequency of the frame data

Returns:

The sampling frequency of the frmae data

hasPadding

public boolean hasPadding()

Is the frame padded?

Returns:

Whether the frame is padded

getSlots

public int getSlots()

Get the number of audio data slots in this frame

Returns:

The number of data slots in the frame

getModeExtension

public int getModeExtension()

Get the stereo mode extension if any

Returns:

Stereo mode extension

getLayerString

public java.lang.String getLayerString()

Get a description of the MPEG layer

Returns:

A String description of the MPEG layer

getBitrateString

public java.lang.String getBitrateString()

Get a description of the frame bitrate

Returns:

A String description of the bitrate

getSampleFrequencyString

public java.lang.String getSampleFrequencyString()

Get a description of the frame sample rate

Returns:

A String description of the frame sample rate

getModeString

public java.lang.String getModeString()

Get a description of the mode

Returns:

A String description of the mode

getNumberOfSubbands

public int getNumberOfSubbands()

Get the number of sub bands

Returns:

the number of sub bands

getIntensityStereoBound

public int getIntensityStereoBound()

Get the intensity stereo bound

Returns:

int

isCRCProtected

public boolean isCRCProtected()

Get the CRC protection indicator bit.

Returns:

0 - Protected by CRC | 1 - Not protected

getBitrate

public int getBitrate()

Get the frame bitrate in bytes/second

Returns:

The bitrate of the frame

getFrameSize

public int getFrameSize()

Get the frame size in bytes (including the header bytes)

Returns:

the size in bytes of the frame

getFrameData

public byte[] getFrameData()

Get the entire frame as a byte array

Returns:

The frame data

getCRCChecksum

public short getCRCChecksum()

Get the CRC checksum for this frame

Returns:

The CRC checksum as a short

toString

public java.lang.String toString()

Get a human readable representation of this header

Overrides:

toString in class java.lang.Object

Returns:

A String description of this header