NAME
sdif2ad - Converts SDIF files to files usable by adsynt. .
DESCRIPTION
Convert files Sound Description Interchange Format (SDIF) to the format
usable by Csound´s adsyn opcode. As of Csound version 4.10, sdif2ad was
available only as a standalone program for Windows console and DOS.
SYNTAX
csound -U sdif2ad [flags] infilename outfilename
INITIALIZATION
Flags:
· -sN -- apply amplitude scale factor N
· -pN -- keep only the first N partials. Limited to 1024 partials.
The source partial track indices are used directly to select
internal storage. As these can be arbitrary values, the maximum of
1024 partials may not be realized in all cases.
· -r -- byte-reverse output file data. The byte-reverse option is
there to facilitate transfer across platforms, as Csound´s adsyn
file format is not portable.
If the filename passed to hetro has the extension “.sdif”, data will be
written in SDIF format as 1TRC frames of additive synthesis data. The
utility program sdif2ad can be used to convert any SDIF file containing
a stream of 1TRC data to the Csound adsyn format. sdif2ad allows the
user to limit the number of partials retained, and to apply an
amplitude scaling factor. This is often necessary, as the SDIF
specification does not, as of the release of sdif2ad, require
amplitudes to be within a particular range. sdif2ad reports
information about the file to the console, including the frequency
range.
The main advantages of SDIF over the adsyn format, for Csound users, is
that SDIF files are fully portable across platforms (data is
“big-endian”), and do not have the duration limit of 32.76 seconds
imposed by the 16 bit adsyn format. This limit is necessarily imposed
by sdif2ad. Eventually, SDIF reading will be incorporated directly into
adsyn, thus enabling files of any length (subject to system memory
limits) to be analysed and processed.
Users should remember that the SDIF formats are still under
development. While the 1TRC format is now fairly well established, it
can still change.
For detailed information on the Sound Description Interchange Format,
refer to the CNMAT website: http://cnmat.CNMAT.Berkeley.EDU/SDIF
Some other SDIF resources (including a viewer) are available via the
NC_DREAM website: http://www.bath.ac.uk/~masjpf/NCD/dreamhome.html
CREDITS
Author: Richard Dobson
Somerset, England
August, 2000
New in Csound version 4.08
AUTHORS
Barry Vercoe
MIT Media Lab
Author.
Dan Ellis
MIT Media Lab,
Cambridge
Massachussetts
Author.
COPYRIGHT