JVCL Help:TJvID3FileInfo.ModeExtension

 JVCL Help: TJvID3FileInfo.ModeExtension Property

TJvID3FileInfo

► TJvID3FileInfo Methods

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[+] TJvID3FileInfo Properties

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Summary

Indicates the mode extension of the MP3 file.

Pascal

 propertyModeExtension: TJvMPEGModeExtension;

Description

Read ModeExtension to determine the mode extension of the MP3 file.
Mode extension is used to join informations that are of no use for stereo effect, thus reducing needed bits. These bits are dynamically determined by an encoder in Joint stereo mode, and Joint Stereo can be changed from one frame to another, or even switched on or off.
Complete frequency range of MPEG file is divided in subbands. There are 32 subbands. For Layer I & II, ModeExtension determines frequency range (bands) where intensity stereo is applied. For Layer III, ModeExtension determines which type of joint stereo is used (intensity stereo or m/s stereo). Frequency range is determined within decompression algorithm.
Layer I & II:

Value	Frequency range
meModeExt0	bands 4 to 31
meModeExt1	bands 8 to 31
meModeExt2	bands 12 to 31
meModeExt3	bands 16 to 31

Layer III:

Value	Intensity stereo	MS stereo
meModeExt0	off	off
meModeExt1	on	off
meModeExt2	off	on
meModeExt3	on	on

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