afGetFrameCount(3)
==================

NAME
----
afGetFrameCount, afGetTrackBytes, afGetDataOffset - get the total sample
frame count, length of audio track in bytes, offset of the audio track for a
track in an audio file


SYNOPSIS
--------
  #include <audiofile.h>

  AFframecount afGetFrameCount (AFfilehandle file, int track);

  AFfileoffset afGetTrackBytes (AFfilehandle file, int track);

  AFfileoffset afGetDataOffset (AFfilehandle file, int track);


PARAMETERS
----------
'file' is an audio file handle created by a previous call to
linkaf:afOpenFile[3].

'track' is an integer which specifies an audio track within 'file'.
All supported file formats contain exactly one audio track per file,
so the constant `AF_DEFAULT_TRACK` should always be used.


DESCRIPTION
-----------
`afGetFrameCount` returns the total number of sample frames contained
within the specified track of the specified file.

Each sample frame of audio consists of a fixed number of samples
(equal to the number of audio channels in the track. For monaural data,
a sample frame consists of one audio sample. For stereophonic data,
a sample frame consists of a stereo pair.

`afGetTrackBytes` returns the total number of bytes of raw audio data
(i.e., prior to decompression or conversion) in the track.

`afGetDataOffset` returns the offset in bytes of the start of the audio
data contained within the specified track of the specified file.


RETURN VALUE
------------
`afGetFrameCount` returns the total number of sample frames in 'track'.

`afGetTrackBytes` returns the total number of bytes of audio data
in 'track'.

`afGetDataOffset` returns the offset in bytes to the beginning of the
audio data in 'track'.

Each of these routines returns -1 in case of error.

AUTHOR
------
Michael Pruett <michael@68k.org>