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view main/audio/aurecord.m @ 0:6b33357c7561 octave-forge
Initial revision
author | pkienzle |
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date | Wed, 10 Oct 2001 19:54:49 +0000 |
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## Copyright (C) 1999 Paul Kienzle ## ## This program 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 of the License, or ## (at your option) any later version. ## ## This program 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 this program; if not, write to the Free Software ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA ## usage: [x, fs] = aurecord(t, fs, channels) ## ## Record for the specified time at the given sample rate. Note that ## the sample rate used may not match the requested sample rate. Use ## the returned rate instead of the requested value in further ## processing. Similarly, the actual number of samples and channels ## may not match the request, so check the size of the returned matrix. ## ## Fs defaults to 8000 Hz and channels defaults to 1. Time is measured ## in seconds. ## TODO: Consider converting into record.m ## TODO: Consider making this a .oct file, incorporating aurecord.cc ## TODO: Consider using aurecord_command='record %s', and read signal from /tmp/blah.wav function [data, rate] = aurecord(time, rate, channels) if nargin<1 || nargin>3 usage("[x, fs] = aurecord(t [, fs, channels])"); end if nargin<2, rate = 8000; end; if nargin<3, channels = 1; end; fid=popen(sprintf("aurecord -r %d -c %d -t %f", rate, channels, \ time), "r"); rate = fread(fid, 1, 'long'); channels = fread(fid, 1, 'long'); if channels == 0 pclose(fid); error("aurecord failed -- perhaps audio device is in use?\n"); end; data = fread(fid, Inf, 'short'); if size(data,1) > 0 data = reshape(data'/32768, length(data)/channels, channels); end end