12-01-2010
thx michael, it is OK
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LEARN ABOUT CENTOS
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)