How to get to play an audio file length

If not through a database query,
While parsing an MP3 file directly.
Do you want to own MP3 resolved before 40 bytes of the file when you go to calculate long?

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Come on. Come to bear stickers
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MediaPlayer.getDuration?
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Tools can be used directly, which is upstairs said MediaPlayer.getDuration, another at the beginning of the audio file also has this information, such as song name, album name, artist name, album pictures have, even if there will be no reserved bits When android system scan songs, song names and other information is also taken from the inside, developers can parse the data themselves.
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reference to the third floor tf110012 reply:

tools can be used directly, which is upstairs said MediaPlayer.getDuration, another at the beginning of the audio file also has information , such as song name, album name, artist name, album pictures have, even if there will be no reserved bits, when the android system scan songs, song names and other information is also taken from the inside, developers can parse the data themselves .

This file parsing easy? Or are there any special tools?