to find header in Mp3 file and retrieve data Post: 302235472

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afgetframesize

AFGETFRAMESIZE(3)														 AFGETFRAMESIZE(3)

NAME

       afGetFrameSize - calculate the frame size in bytes for an audio track

SYNOPSIS

       #include <audiofile.h>

       float afGetFrameSize (AFfilehandle file, int track, int expand3to4);

PARAMETERS

       file is a valid AFfilehandle.

       track is an integer which refers to a specific audio track in the file. At present no supported audio file format allows for more than one
       audio track within a file, so track should always be AF_DEFAULT_TRACK.

       expand3to4 is a boolean-valued integer indicating whether frame size calculation will treat 24-bit data as having a size of 3 bytes or 4
       bytes.

DESCRIPTION

       afGetFrameSize returns the number of bytes in a frame in a given audio track.

       A sample frame consists of one or more samples. For a monaural track, a sample frame will always contain one sample. For a stereophonic
       track, a sample frame will always contain two samples, one for the left channel and one for the right channel.

       A non-zero value of expand3to4 should be used when calculating the frame size for storage in memory (since 24-bit audio data is presented
       in memory as a 4-byte sign-extended integer), while a value of zero should be used for calculating storage on disk where no padding is
       added. The parameter expand3to4 is ignored unless the specified audio track contains 24-bit audio data.

AUTHOR

       Michael Pruett <michael@68k.org>

Audio File Library 0.3.6					    03/06/2013							 AFGETFRAMESIZE(3)

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