update packages

[CreaPhase.git] / octave_packages / m / audio / saveaudio.m

diff --git a/octave_packages/m/audio/saveaudio.m b/octave_packages/m/audio/saveaudio.m
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+## Copyright (C) 1995-2012 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 3 of the License, 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, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} saveaudio (@var{name}, @var{x}, @var{ext}, @var{bps})
+## Save a vector @var{x} of audio data to the file
+## @file{@var{name}.@var{ext}}.  The optional parameters @var{ext} and
+## @var{bps} determine the encoding and the number of bits per sample used
+## in the audio file (see @code{loadaudio}); defaults are @file{lin} and
+## 8, respectively.
+## @seealso{lin2mu, mu2lin, loadaudio, playaudio, setaudio, record}
+## @end deftypefn
+
+## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at>
+## Created: 5 September 1994
+## Adapted-By: jwe
+
+function saveaudio (name, x, ext, bps)
+
+  if (nargin < 2 || nargin > 4)
+    print_usage ();
+  endif
+
+  if (nargin == 2)
+    ext = "lin";
+  endif
+
+  if (nargin < 4)
+    bps = 8;
+  elseif (bps != 8 && bps != 16)
+    error ("saveaudio: BPS 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 (bps == 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") || strcmp (ext, "ul"))
+    y = lin2mu (x);
+    c = fwrite (num, y, "uchar");
+  else
+    fclose (num);
+    error ("saveaudio: unsupported extension");
+  endif
+
+  fclose (num);
+
+endfunction