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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} {} saveaudio (@var{name}, @var{x}, @var{ext}, @var{bps}) |
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22 ## Saves a vector @var{x} of audio data to the file |
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23 ## @file{@var{name}.@var{ext}}. The optional parameters @var{ext} and |
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24 ## @var{bps} determine the encoding and the number of bits per sample used |
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25 ## in the audio file (see @code{loadaudio}); defaults are @file{lin} and |
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26 ## 8, respectively. |
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27 ## @end deftypefn |
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28 ## |
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29 ## @seealso{lin2mu, mu2lin, loadaudio, playaudio, setaudio, and record} |
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30 |
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31 ## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at> |
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32 ## Created: 5 September 1994 |
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33 ## Adapted-By: jwe |
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34 |
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35 function saveaudio (name, X, ext, bit) |
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36 |
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37 if (nargin < 2 || nargin > 4) |
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38 usage ("saveaudio (X, name, ext, bit)"); |
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39 endif |
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40 |
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41 if (nargin == 2) |
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42 ext = "lin"; |
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43 endif |
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44 |
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45 if (nargin < 4) |
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46 bit = 8; |
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47 elseif (bit != 8 && bit != 16) |
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48 error ("saveaudio: bit must be either 8 or 16"); |
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49 endif |
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50 |
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51 [nr, nc] = size (X); |
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52 if (nc != 1) |
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53 if (nr == 1) |
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54 X = X'; |
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55 nr = nc; |
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56 else |
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57 error ("saveaudio: X must be a vector"); |
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58 endif |
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59 endif |
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60 |
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61 num = fopen ([name, ".", ext], "wb"); |
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62 |
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63 if (strcmp (ext, "lin") || strcmp (ext, "raw")) |
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64 if (bit == 8) |
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65 ld = max (abs (X)); |
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66 if (ld > 127) # convert 16 to 8 bit |
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67 if (ld < 16384) |
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68 sc = 64 / ld; |
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69 else |
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70 sc = 1 / 256; |
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71 endif |
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72 X = fix (X * sc); |
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73 endif |
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74 X = X + 127; |
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75 c = fwrite (num, X, "uchar"); |
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76 else |
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77 c = fwrite (num, X, "short"); |
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78 endif |
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79 elseif (strcmp (ext, "mu") || strcmp (ext, "au") |
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80 || strcmp (ext, "snd") || strcmp (ext, "ul")) |
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81 Y = lin2mu (X); |
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82 c = fwrite (num, Y, "uchar"); |
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83 else |
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84 fclose (num); |
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85 error ("saveaudio does not support given extension"); |
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86 endif |
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87 |
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88 fclose (num); |
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89 |
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90 endfunction |
