On May 27, 5:05 am, Randy Yates <y...@ieee.org> wrote:
> I wrote:
> > I'm using octave 2.9.9 on
>
> > [yates@localhost inp]$ uname -a
> > Linux localhost.localdomain 2.6.20-1.2948.fc6 #1 SMP Fri Apr 27 19:18:54 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
>
> > and I'm experiencing two problems with wavwrite():
>
> >   1. The parameter order changed between version 2.9.8 and 2.9.9. This is
> >   not really a problem, but may be noteworthy.
>
> >   2. wavwrite() doesn't seem to be able to create a valid .wav file:
>
> >   [yates] octave
> >   >x=2*rand(1,128)-1;
> >   >wavwrite('test.wav',x,64000,16);
> >   >quit
>
> >   [yates] play test.wav
> >   sox: Failed reading test.wav: WAVE header not found
>
> > What's up with this?
>
> The problem is caused by bugs in wavwrite.m. Namely, it assumes
> lengths for the architecture-dependent data types "short" and "ulong".
> I'm including an updated version that is corrected and seems to work.
>
> PS: I believe you have the same problem in ausave() since it gave
> the exact same error.
> --
> %  Randy Yates                  % "And all that I can do
> %% Fuquay-Varina, NC            %  is say I'm sorry,
> %%% 919-577-9882                %  that's the way it goes..."
> %%%% <y...@ieee.org>           % Getting To The Point', *Balance of Power*, ELOhttp://home.earthlink.net/~yatescr
>
> ## Copyright (C) 2005 Michael Zeising
> ##
> ## 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
> ## 02110-1301, USA.
>
> ## -*- texinfo -*-
> ## @deftypefn {Function File} {} wavwrite(@var{filename}, @var{y})
> ## Write @var{y} to the canonical RIFF/WAVE sound file @var{filename}. A sample
> ## rate of 8000 Hz and 16-bit samples are assumed. Each column of the data
> ## represents a separate channel.
> ##
> ## @deftypefnx {Function File} {} wavwrite(@var{filename}, @var{y}, @var{fs})
> ## Set the sample rate to @var{fs} Hz.
> ##
> ## @deftypefnx {Function File} {} wavwrite(@var{filename}, @var{y}, @var{fs}, @var{bits})
> ## Set the sample rate to @var{fs} Hz and resolution to @var{bits} bits.
> ## @seealso{wavread}
> ## @end deftypefn
>
> ## Author: Michael Zeising <michael.zeis...@stud.uni-erlangen.de>
> ## Created: 06 December 2005
>
> function wavwrite (filename, y, samples_per_sec, bits_per_sample)
>
>   BYTEORDER = "ieee-le";
>
>   if (nargin < 2 || nargin > 4)
>     usage ("wavwrite (filename, y, samples_per_sec, bits_per_sample)");
>   endif
>
>   ## parse arguments
>   if (nargin < 3)
>     warning ("wavwrite: sample rate set to 8000 Hz");
>     samples_per_sec = 8000;
>   endif
>
>   if (nargin < 4)
>     warning ("wavwrite: sample resolution set to 16-bit");
>     bits_per_sample = 16;
>   endif
>
>   ## determine sample format
>   switch (bits_per_sample)
>     case 8
>       format = "uint8";
>     case 16
>       format = "int16";
>     case 32
>       format = "int32";
>     otherwise
>       error ("wavread: sample resolution not supported");
>   endswitch
>
>   ## calculate filesize
>   channels = size(y)(2);
>   n = size(y)(1);
>
>   ## size of data chunk
>   ck_size = n*channels*(bits_per_sample/8);
>
>   ## open file for writing binary
>
>   if (! ischar (filename))
>     error ("wavwrite: expecting filename to be a character string");
>   endif
>
>   [fid, msg] = fopen (filename, "wb");
>   if (fid < 0)
>     error ("wavwrite: %s", msg)
>   endif
>
>   ## write RIFF/WAVE header
>   c = 0;
>   c += fwrite (fid, "RIFF", "uchar");
>
>   ## file size - 8
>   c += fwrite (fid, ck_size + 36, "uint32", 0, BYTEORDER);
>   c += fwrite (fid, "WAVEfmt ", "uchar");
>
>   ## size of fmt chunk
>   c += fwrite (fid, 16, "uint32", 0, BYTEORDER);
>
>   ## sample format code (PCM)
>   c += fwrite (fid, 0x0001, "uint16", 0, BYTEORDER);
>
>   ## channels
>   c += fwrite (fid, channels, "uint16", 0, BYTEORDER);
>
>   ## sample rate
>   c += fwrite (fid, samples_per_sec, "uint32", 0, BYTEORDER);
>
>   ## bytes per second
>   bps = samples_per_sec*channels*bits_per_sample/8;
>   c += fwrite (fid, bps, "uint32", 0, BYTEORDER);
>
>   ## block align
>   c += fwrite (fid, channels*bits_per_sample/8, "uint16", 0, BYTEORDER);
>
>   c += fwrite (fid, bits_per_sample, "uint16", 0, BYTEORDER);
>   c += fwrite (fid, "data", "uchar");
>   c += fwrite (fid, ck_size, "uint32", 0, BYTEORDER);
>
>   if (c < 25)
>     fclose (fid);
>     error ("wavread: writing to file failed");
>   endif
>
>   ## interleave samples
>   yi = reshape (y', n*channels, 1);
>
>   ## scale samples
>   switch (bits_per_sample)
>     case 8
>       yi = round (yi*127.5 + 127.5);
>     case 16
>       yi = floor (yi*32767.5);
>     case 32
>       yi = floor (yi*2147483647.5);
>   endswitch
>
>   ## write to file
>   c = fwrite (fid, yi, format, 0, BYTEORDER);
>
>   fclose (fid);
>
> endfunction


Randy,

Please send this report to bug@octave.org as this is a bug report in a
core octave function

D.