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