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view main/audio/aucapture.m @ 0:6b33357c7561 octave-forge
Initial revision
author | pkienzle |
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date | Wed, 10 Oct 2001 19:54:49 +0000 |
parents | |
children | 0678a57ca922 |
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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] = aucapture(t, fs, channels) ## ## Capture an audio event at the given sample rate fs. This uses an ## endpoint detection routine to eliminate the silence surrounding the ## event. On return, data contains the samples, one column per channel ## and rate contains the sample rate used. Note that the sample rate ## used may not match the requested sample rate. Use the returned rate ## for further processing. Similarly, the actual number of samples and ## channels may not match the request. ## ## Time defaults to 10s, rate defaults to 8000 Hz, and channels defaults ## to 1 ## TODO: Consider combining with aurecord.m, with capture indicated by ## TODO: time t=[] or t=0 or t<0, or maybe aurecord_usecapture function [data, rate] = aucapture(time, rate, channels) if nargin>3 usage("[x, fs] = aucapture([t, fs, channels]);"); end if nargin<1, time = 10.0; end if nargin<2, rate = 8000; end if nargin<3, channels = 1; end com = sprintf("aurecord -e -r %d -c %d -t %f", rate, channels, time) fid = popen(com, "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')/32768; data = reshape(data, length(data)/channels, channels); pclose(fid); end