[directmusic] Re: DirectX 9 Audio Book and RIFF formats (sequence tracks)

  • From: "Todor Fay" <todor@xxxxxxxxxxxxx>
  • To: <directmusic@xxxxxxxxxxxxx>
  • Date: Wed, 7 Jan 2004 20:50:30 -0800

My hunch is these must be edit time chunks inserted by Producer but not
used by the api. Are you seeing these in run time files or in Producer's
edit time versions?  


-----Original Message-----
From: directmusic-bounce@xxxxxxxxxxxxx
[mailto:directmusic-bounce@xxxxxxxxxxxxx] On Behalf Of Robert Schmid
Sent: Wednesday, January 07, 2004 7:29 PM
To: directmusic@xxxxxxxxxxxxx
Subject: [directmusic] DirectX 9 Audio Book and RIFF formats (sequence

Having purchased and read DirectX 9 Audio Exposed (which helped
greatly), and delving into the RIFF format with some RIFF-reading C++
code, does anyone know what the Sequence track section LIST named 'psql'
is for?  Most of the RIFF structures are in the SDK help files, but
'psql' is nowhere to be found - there, or on Google.  
This list also has two subchunks labeled 'psqc' and 'cvau'.  Are these
needed for a Segment to play properly?  What do they hold?  What are the

I am attempting to use IStream and IPersistStream to dynamically write
notes to a sequence track (using Todor Fay's suggestion from an earlier

Any additional information on the sequence RIFF format would be much
appreciated (or a pointer to where such information exists).

Thanks very much,


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