MPEGInfo

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joeshmoe.mpeg
Interface MPEGInfo

All Known Implementing Classes:: ProbedMPEGInfo

public interface MPEGInfo

A class which implements this interface contains information about an MPEG audio file.

Method Summary

int getBitrate()
          Returns (in KB/s) the bitrate of the MPEG audio file.

int getChannelMode()
          Returns the channel mode of the file.

long getFileSize()
          Returns the number of bytes of audio data in this file.

ID3Tag getID3()
          Returns the ID3 tag contained inside the file.

int getIntensityBands()
          Returns a numeric code indicating the frequency bands for which intensity stereo was applied.

int getLayer()
          Returns the MPEG audio layer number.

long getLength()
          Returns the length of the audio data in milliseconds.

int getSamplingRate()
          Returns the sampling rate of the MPEG audio file.

int getVersion()
          Returns the version of the MPEG audio file.

boolean isCopyright()
          Returns true if the copyright bit is set, false otherwise.

boolean isCRCProtected()
          Returns true if the file contains CRC protection data, false otherwise.

boolean isIntensityStereo()
          Returns true if the file uses intensity stereo.

boolean isMSStereo()
          Returns true if the file uses m/s stereo.

boolean isOriginal()
          Returns true if the original bit is set, false otherwise.

boolean isVBR()
          Returns true if the MPEG audio file has a variable bit rate (VBR), false if the bit rate is constant (CBR).

Method Detail

getVersion

public int getVersion()

Returns the version of the MPEG audio file.

1 - MPEG1
2 - MPEG2

Currently, only MPEG1 and MPEG2 are supported. MPEG2.5 files will simple be classified as MPEG2 and certain pieces of information about the files may be incorrect.

getLayer

public int getLayer()

Returns the MPEG audio layer number. Valid values are 1, 2, and 3.

isVBR

public boolean isVBR()

Returns true if the MPEG audio file has a variable bit rate (VBR), false if the bit rate is constant (CBR).

getBitrate

public int getBitrate()

Returns (in KB/s) the bitrate of the MPEG audio file. For CBR files, this is the actual bitrate of the file. For VBR, this is the average bitrate across the entire file.

getSamplingRate

public int getSamplingRate()

Returns the sampling rate of the MPEG audio file. The value is in samples per second.

getChannelMode

public int getChannelMode()

Returns the channel mode of the file. Valid values are:

1 - True stereo
2 - Joint stereo
3 - Dual channel (2 mono channels)
4 - Single channel mono

isIntensityStereo

public boolean isIntensityStereo()

Returns true if the file uses intensity stereo. This only applies if the channel mode is joint stereo. All other channel modes will return false. Layer 1 and layer 2 MPEG audio files will always return true. For these files, you can call getIntensityBands to determine the frequency bands where intensity stereo is applied. For layer 3 files, this method may return false.

isMSStereo

public boolean isMSStereo()

Returns true if the file uses m/s stereo. This may return true if the file is layer 3 and channel mode is joint stereo. All other channel modes and layers will always return false.

getIntensityBands

public int getIntensityBands()

Returns a numeric code indicating the frequency bands for which intensity stereo was applied. This will return -1 for all files that are not encoded in joint stereo or for all layer 3 joint stereo files. The valid return values are:

-1 - not applicable
1 - bands 4 to 31
2 - bands 8 to 31
3 - bands 12 to 31
4 - bands 16 to 31

getLength

public long getLength()

Returns the length of the audio data in milliseconds.

getFileSize

public long getFileSize()

Returns the number of bytes of audio data in this file. This number is not always equal to the actual size of the file because of extra header information and/or an ID3 tag.

isCRCProtected

public boolean isCRCProtected()

Returns true if the file contains CRC protection data, false otherwise.

isCopyright

public boolean isCopyright()

Returns true if the copyright bit is set, false otherwise.

isOriginal

public boolean isOriginal()

Returns true if the original bit is set, false otherwise.

getID3

public ID3Tag getID3()

Returns the ID3 tag contained inside the file. If there is no ID3 tag, null is returned.