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## Copyright (C) 1996 John W. Eaton
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## usage: saveaudio (name, X, [, ext [, bit]])
##
## Saves a vector X of audio data in the file "name.ext".
## The format of the audio file is determined by ext which has to be
## written without an inital "."; default value for ext is "lin".
##
## Currently, the following audio formats are supported:
## *) mu-law files with extension "mu", "au" or "snd"
## *) linearly encoded files with extension "lin" or "raw"
## If the data is saved linearly, the bit argument decides whether an
## 8-bit (default) or a 16-bit format is used.
## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at>
## Created: 5 September 1994
## Adapted-By: jwe
function saveaudio (name, X, ext, bit)
if (nargin < 2 || nargin > 4)
usage ("saveaudio (X, name [, ext [, bit]])");
endif
if (nargin == 2)
ext = "lin";
endif
if (nargin < 4)
bit = 8;
elseif (bit != 8 && bit != 16)
error ("saveaudio: bit must be either 8 or 16");
endif
[nr, nc] = size (X);
if (nc != 1)
if (nr == 1)
X = X';
nr = nc;
else
error ("saveaudio: X must be a vector.");
endif
endif
num = fopen ([name, ".", ext], "wb");
if (strcmp (ext, "lin") || strcmp (ext, "raw"))
if (bit == 8)
ld = max (abs (X));
if (ld > 127) # convert 16 to 8 bit
if (ld < 16384)
sc = 64 / ld;
else
sc = 1 / 256;
endif
X = fix (X * sc);
endif
X = X + 127;
c = fwrite (num, X, "uchar");
else
c = fwrite (num, X, "short");
endif
elseif (strcmp (ext, "mu") || strcmp (ext, "au") || strcmp (ext, "snd"))
Y = lin2mu (X);
c = fwrite (num, Y, "uchar");
else
fclose (num);
error ("saveaudio does not support given extension");
endif
fclose (num);
endfunction
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