How to set duration for VBR stream?

[vijay]

Hi,
   I am writing mp3 parser and decoder plugin.
In case of VBR stream if duration is not there in id3 how to set the
duration

Do i need to parse the file till end of the stream and to calculate the
duration using average bit rate?

or

Can  we able to set the duration while playing by getting the bitrate for
each frame?

Regards,
Vijay P
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