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org.esau.ptarmigan.impl
Class MPEGFrameHeader  

java.lang.Object
  org.esau.ptarmigan.impl.MPEGFrameHeader

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public final class MPEGFrameHeader

extends java.lang.Object

MPEG Frame Header

Parse and validate a 4-byte MPEG Header

Version:

$Revision: 1.2 $ $Date: 2002/10/02 05:27:03 $

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Field Summary
(package private) static int	AUDIO_VER_MASK
(package private) static int	AUDIO_VER_RESERVED
(package private) static int	AUDIO_VER_SHIFT
(package private) static int	AUDIO_VER_VERSION_1
(package private) static int	AUDIO_VER_VERSION_2
(package private) static int	AUDIO_VER_VERSION_2_5
(package private) static int	BAD
(package private) static int[][]	BIT_RATES
(package private) static int	BITRATE_MASK
(package private) static int	BITRATE_SHIFT
(package private) static int	CHANNEL_DUAL
(package private) static int	CHANNEL_JOINT_STEREO
(package private) static int	CHANNEL_MASK
(package private) static int	CHANNEL_SHIFT
(package private) static int	CHANNEL_SINGLE
(package private) static int	CHANNEL_STEREO
(package private) static int	COPYRIGHT_MASK
(package private) static int	EMPHASIS_MASK
(package private) static int	EMPHASIS_SHIFT
(package private) static int	FRAME_SYNC_MASK
(package private) static int	FREE
(package private) static int	HEADER_SIZE
(package private) static int	LAYER_I
(package private) static int	LAYER_II
(package private) static int	LAYER_III
(package private) static int	LAYER_MASK
(package private) static int	LAYER_RESERVED
(package private) static int	LAYER_SHIFT
(package private) static org.apache.commons.logging.Log	log           logging object
(package private) static int	LOOKUP_FAILURE
(package private)  int	m_audio_ver
(package private)  int	m_bit_rate
(package private)  int	m_bitrate_index
(package private)  int	m_channel_mode
(package private)  boolean	m_copyright
(package private)  int	m_emphasis
(package private)  int	m_frame_length
(package private)  int	m_layer_code
(package private)  int	m_mode_ext
(package private)  boolean	m_original
(package private)  boolean	m_padding
(package private)  boolean	m_private_bit
(package private)  boolean	m_protection
(package private)  int	m_sample_index
(package private)  int	m_sample_rate
(package private) static int	MODE_EXT_MASK
(package private) static int	MODE_EXT_SHIFT
(package private) static int	ORIGINAL_MASK
(package private) static int	PADDING_MASK
(package private) static int	PRIVATE_MASK
(package private) static int	PROTECTION_MASK
(package private) static java.lang.String[]	S_AUDIO_VER
(package private) static java.lang.String[]	S_CHANNEL_MODE
(package private) static int[]	S_LAYER
(package private) static java.lang.String[]	S_MODE_EXT_LAYER_I_II
(package private) static java.lang.String[]	S_MODE_EXT_LAYER_III
(package private) static int	SAMPLE_MASK
(package private) static int[][]	SAMPLE_RATES
(package private) static int	SAMPLE_SHIFT
(package private) static int	SLOT_LAYER_I
(package private) static int	SLOT_LAYER_II_III

 

Constructor Summary

MPEGFrameHeader()           ctor

MPEGFrameHeader(MPEGFrameHeader other)           copy ctor

 

Method Summary
(package private)  boolean	calculateFrameLength()           frame length in bytes
java.lang.String	getAudioVersion()
int	getBitRate()
java.lang.String	getChannelDesc()
int	getChannelMode()
int	getChannels()
boolean	getCopyright()
int	getEmphasis()
int	getFrameLength()
int	getLayer()
int	getModeExt()
boolean	getOriginal()
boolean	getPadding()
boolean	getPrivateBit()
boolean	getProtection()
int	getSampleRate()
boolean	initHeader(byte[] buf, int offset)           Try to identify a frame header in the specified buffer at the specified offset.
(package private)  boolean	lookupBitRate()           bit rate in bits per second
(package private)  boolean	lookupSampleRate()           sample rate
void	resetData()
(package private)  boolean	validate()           A number of tests to validate a single frame.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

m_audio_ver

int m_audio_ver

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m_layer_code

int m_layer_code

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m_protection

boolean m_protection

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m_bitrate_index

int m_bitrate_index

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m_sample_index

int m_sample_index

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m_padding

boolean m_padding

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m_private_bit

boolean m_private_bit

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m_channel_mode

int m_channel_mode

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m_mode_ext

int m_mode_ext

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m_copyright

boolean m_copyright

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m_original

boolean m_original

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m_emphasis

int m_emphasis

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m_bit_rate

int m_bit_rate

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m_sample_rate

int m_sample_rate

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m_frame_length

int m_frame_length

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FRAME_SYNC_MASK

static final int FRAME_SYNC_MASK

See Also:

Constant Field Values

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AUDIO_VER_MASK

static final int AUDIO_VER_MASK

See Also:

Constant Field Values

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AUDIO_VER_SHIFT

static final int AUDIO_VER_SHIFT

See Also:

Constant Field Values

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LAYER_MASK

static final int LAYER_MASK

See Also:

Constant Field Values

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LAYER_SHIFT

static final int LAYER_SHIFT

See Also:

Constant Field Values

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PROTECTION_MASK

static final int PROTECTION_MASK

See Also:

Constant Field Values

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BITRATE_MASK

static final int BITRATE_MASK

See Also:

Constant Field Values

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BITRATE_SHIFT

static final int BITRATE_SHIFT

See Also:

Constant Field Values

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SAMPLE_MASK

static final int SAMPLE_MASK

See Also:

Constant Field Values

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SAMPLE_SHIFT

static final int SAMPLE_SHIFT

See Also:

Constant Field Values

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PADDING_MASK

static final int PADDING_MASK

See Also:

Constant Field Values

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PRIVATE_MASK

static final int PRIVATE_MASK

See Also:

Constant Field Values

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CHANNEL_MASK

static final int CHANNEL_MASK

See Also:

Constant Field Values

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CHANNEL_SHIFT

static final int CHANNEL_SHIFT

See Also:

Constant Field Values

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MODE_EXT_MASK

static final int MODE_EXT_MASK

See Also:

Constant Field Values

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MODE_EXT_SHIFT

static final int MODE_EXT_SHIFT

See Also:

Constant Field Values

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COPYRIGHT_MASK

static final int COPYRIGHT_MASK

See Also:

Constant Field Values

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ORIGINAL_MASK

static final int ORIGINAL_MASK

See Also:

Constant Field Values

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EMPHASIS_MASK

static final int EMPHASIS_MASK

See Also:

Constant Field Values

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EMPHASIS_SHIFT

static final int EMPHASIS_SHIFT

See Also:

Constant Field Values

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LOOKUP_FAILURE

static final int LOOKUP_FAILURE

See Also:

Constant Field Values

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FREE

static final int FREE

See Also:

Constant Field Values

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BAD

static final int BAD

See Also:

Constant Field Values

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BIT_RATES

static final int[][] BIT_RATES

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SAMPLE_RATES

static final int[][] SAMPLE_RATES

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S_AUDIO_VER

static final java.lang.String[] S_AUDIO_VER

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S_LAYER

static final int[] S_LAYER

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S_CHANNEL_MODE

static final java.lang.String[] S_CHANNEL_MODE

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S_MODE_EXT_LAYER_I_II

static final java.lang.String[] S_MODE_EXT_LAYER_I_II

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S_MODE_EXT_LAYER_III

static final java.lang.String[] S_MODE_EXT_LAYER_III

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HEADER_SIZE

static final int HEADER_SIZE

See Also:

Constant Field Values

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AUDIO_VER_VERSION_2_5

static final int AUDIO_VER_VERSION_2_5

See Also:

Constant Field Values

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AUDIO_VER_RESERVED

static final int AUDIO_VER_RESERVED

See Also:

Constant Field Values

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AUDIO_VER_VERSION_2

static final int AUDIO_VER_VERSION_2

See Also:

Constant Field Values

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AUDIO_VER_VERSION_1

static final int AUDIO_VER_VERSION_1

See Also:

Constant Field Values

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LAYER_RESERVED

static final int LAYER_RESERVED

See Also:

Constant Field Values

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LAYER_III

static final int LAYER_III

See Also:

Constant Field Values

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LAYER_II

static final int LAYER_II

See Also:

Constant Field Values

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LAYER_I

static final int LAYER_I

See Also:

Constant Field Values

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CHANNEL_STEREO

static final int CHANNEL_STEREO

See Also:

Constant Field Values

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CHANNEL_JOINT_STEREO

static final int CHANNEL_JOINT_STEREO

See Also:

Constant Field Values

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CHANNEL_DUAL

static final int CHANNEL_DUAL

See Also:

Constant Field Values

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CHANNEL_SINGLE

static final int CHANNEL_SINGLE

See Also:

Constant Field Values

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SLOT_LAYER_I

static final int SLOT_LAYER_I

See Also:

Constant Field Values

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SLOT_LAYER_II_III

static final int SLOT_LAYER_II_III

See Also:

Constant Field Values

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log

static org.apache.commons.logging.Log log

logging object

Constructor Detail

MPEGFrameHeader

public MPEGFrameHeader()

ctor

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MPEGFrameHeader

public MPEGFrameHeader(MPEGFrameHeader other)

copy ctor

Method Detail

initHeader

public boolean initHeader(byte[] buf,
                          int offset)

Try to identify a frame header in the specified buffer at the specified offset. Note that it's not definitive. You have to look for repeating MPEG frames and check CRCs to make sure. AAAAAAAA AAABBCCD EEEEFFGH IIJJKLMM

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getAudioVersion

public java.lang.String getAudioVersion()

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getLayer

public int getLayer()

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getProtection

public boolean getProtection()

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getPadding

public boolean getPadding()

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getPrivateBit

public boolean getPrivateBit()

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getChannelMode

public int getChannelMode()

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getModeExt

public int getModeExt()

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getChannels

public int getChannels()

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getChannelDesc

public java.lang.String getChannelDesc()

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getCopyright

public boolean getCopyright()

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getOriginal

public boolean getOriginal()

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getEmphasis

public int getEmphasis()

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getBitRate

public int getBitRate()

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getSampleRate

public int getSampleRate()

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getFrameLength

public int getFrameLength()

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validate

boolean validate()

A number of tests to validate a single frame. The results are not definitive. For best results, check consecutive frames and the CRC, if present.

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lookupBitRate

boolean lookupBitRate()

bit rate in bits per second

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lookupSampleRate

boolean lookupSampleRate()

sample rate

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calculateFrameLength

boolean calculateFrameLength()

frame length in bytes

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resetData

public void resetData()

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> esau >> ptarmigan >> [ impl overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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