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1 ### Copyright (C) 1996 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 function saveaudio (name, X, ext, bit) |
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21 |
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22 ## usage: saveaudio (name, X, [, ext [, bit]]) |
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23 ## |
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24 ## Saves a vector X of audio data in the file "name.ext". |
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25 ## The format of the audio file is determined by ext which has to be |
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26 ## written without an inital "."; default value for ext is "lin". |
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27 ## |
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28 ## Currently, the following audio formats are supported: |
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29 ## *) mu-law files with extension "mu", "au" or "snd" |
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30 ## *) linearly encoded files with extension "lin" or "raw" |
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31 ## If the data is saved linearly, the bit argument decides whether an |
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32 ## 8-bit (default) or a 16-bit format is used. |
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33 |
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34 ## Written by AW (Andreas.Weingessel@ci.tuwien.ac.at) on Sep 5, 1994 |
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35 ## Last modified by AW on Oct 29, 1994 |
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36 ## Copyright Dept of Probability Theory and Statistics TU Wien |
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37 |
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38 if (nargin < 2 || nargin > 4) |
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39 usage ("saveaudio (X, name [, ext [, bit]])"); |
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40 endif |
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41 |
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42 if (nargin == 2) |
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43 ext = "lin"; |
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44 endif |
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45 |
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46 if (nargin < 4) |
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47 bit = 8; |
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48 elseif (bit != 8 && bit != 16) |
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49 error ("saveaudio: bit must be either 8 or 16"); |
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50 endif |
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51 |
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52 [nr, nc] = size (X); |
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53 if (nc != 1) |
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54 if (nr == 1) |
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55 X = X'; |
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56 nr = nc; |
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57 else |
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58 error ("saveaudio: X must be a vector."); |
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59 endif |
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60 endif |
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61 |
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62 num = fopen ([name, ".", ext], "w"); |
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63 |
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64 if (strcmp (ext, "lin") || strcmp (ext, "raw")) |
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65 if (bit == 8) |
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66 ld = max (abs (X)); |
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67 if (ld > 127) # convert 16 to 8 bit |
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68 if (ld < 16384) |
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69 sc = 64 / ld; |
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70 else |
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71 sc = 1 / 256; |
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72 endif |
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73 X = fix (X * sc); |
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74 endif |
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75 X = X + 127; |
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76 c = fwrite (num, X, "uchar"); |
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77 else |
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78 c = fwrite (num, X, "short"); |
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79 endif |
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80 elseif (strcmp (ext, "mu") || strcmp (ext, "au") || strcmp (ext, "snd")) |
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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 |
