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1 ## Copyright (C) 1996, 1997 John W. Eaton |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 2, or (at your option) |
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8 ## any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, write to the Free |
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
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18 ## 02111-1307, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} record (@var{sec}, @var{sampling_rate}) |
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22 ## Records @var{sec} seconds of audio input into the vector @var{x}. The |
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23 ## default value for @var{sampling_rate} is 8000 samples per second, or |
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24 ## 8kHz. The program waits until the user types @key{RET} and then |
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25 ## immediately starts to record. |
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26 ## @end deftypefn |
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27 |
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28 ## See also: lin2mu, mu2lin, loadaudio, saveaudio, playaudio, setaudio |
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29 |
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30 ## usage: X = record (sec [, sampling_rate]) |
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31 ## |
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32 ## Records sec seconds of audio into the vector X. |
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33 ## The default value for the sampling_rate is 8000, ie. 8kHz. |
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34 ## The program waits for you to hit the ENTER key, then the recording |
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35 ## starts immediatly. |
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36 |
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37 ## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at> |
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38 ## Created: 19 September 1994 |
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39 ## Adapted-By: jwe |
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40 |
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41 function X = record (sec, sampling_rate) |
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42 |
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43 if (nargin == 1) |
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44 sampling_rate = 8000; |
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45 elseif (nargin != 2) |
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46 usage ("X = record (sec [, sampling_rate])"); |
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47 endif |
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48 |
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49 unwind_protect |
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50 |
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51 file = tmpnam (); |
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52 |
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53 input ("Please hit ENTER and speak afterwards!\n", 1); |
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54 |
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55 cmd = sprintf ("dd if=/dev/dsp of=%s bs=%d count=%d", |
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56 file, sampling_rate, sec) |
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57 |
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58 system (cmd); |
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59 |
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60 num = fopen (file, "rb"); |
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61 |
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62 [Y, c] = fread (num, sampling_rate * sec, "uchar"); |
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63 |
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64 fclose (num); |
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65 |
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66 unwind_protect_cleanup |
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67 |
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68 unlink (file); |
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69 |
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70 end_unwind_protect |
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71 |
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72 X = Y - 127; |
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73 |
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74 endfunction |
