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comparison main/audio/aurecord.m @ 0:6b33357c7561 octave-forge

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Initial revision
author pkienzle
date Wed, 10 Oct 2001 19:54:49 +0000
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-1:000000000000 0:6b33357c7561
1 ## Copyright (C) 1999 Paul Kienzle
2 ##
3 ## This program is free software; you can redistribute it and/or modify
4 ## it under the terms of the GNU General Public License as published by
5 ## the Free Software Foundation; either version 2 of the License, or
6 ## (at your option) any later version.
7 ##
8 ## This program is distributed in the hope that it will be useful,
9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 ## GNU General Public License for more details.
12 ##
13 ## You should have received a copy of the GNU General Public License
14 ## along with this program; if not, write to the Free Software
15 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16
17 ## usage: [x, fs] = aurecord(t, fs, channels)
18 ##
19 ## Record for the specified time at the given sample rate. Note that
20 ## the sample rate used may not match the requested sample rate. Use
21 ## the returned rate instead of the requested value in further
22 ## processing. Similarly, the actual number of samples and channels
23 ## may not match the request, so check the size of the returned matrix.
24 ##
25 ## Fs defaults to 8000 Hz and channels defaults to 1. Time is measured
26 ## in seconds.
27
28 ## TODO: Consider converting into record.m
29 ## TODO: Consider making this a .oct file, incorporating aurecord.cc
30 ## TODO: Consider using aurecord_command='record %s', and read signal from /tmp/blah.wav
31 function [data, rate] = aurecord(time, rate, channels)
32
33 if nargin<1 || nargin>3
34 usage("[x, fs] = aurecord(t [, fs, channels])");
35 end
36 if nargin<2, rate = 8000; end;
37 if nargin<3, channels = 1; end;
38
39 fid=popen(sprintf("aurecord -r %d -c %d -t %f", rate, channels, \
40 time), "r");
41 rate = fread(fid, 1, 'long');
42 channels = fread(fid, 1, 'long');
43 if channels == 0
44 pclose(fid);
45 error("aurecord failed -- perhaps audio device is in use?\n");
46 end;
47 data = fread(fid, Inf, 'short');
48 if size(data,1) > 0
49 data = reshape(data'/32768, length(data)/channels, channels);
50 end
51 end