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1636
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1 function playaudio (name, ext) |
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2 |
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3 # usage: playaudio (name [, ext]) |
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4 # playaudio (X) |
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5 # |
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6 # `playaudio ("name" [, "ext"])' plays the audio file "name.ext". The |
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7 # default value for the "ext" argument, which has to be written |
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8 # without the initial ".", is "lin". |
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9 # Currently, the following audio formats are suppored: |
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10 # *) linear encoding with extension "lin" or "raw", played using |
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11 # /dev/dsp |
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12 # *) mu-law encoding with extension "mu", "au" or "snd", played |
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13 # using /dev/audio |
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14 # |
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15 # `playaudio (X)' plays the audio data contained in the vector X. |
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16 |
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17 # Written by AW (Andreas.Weingessel@ci.tuwien.ac.at) on Apr 11, 1994 |
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18 # Last modified by AW on Nov 7, 1994 |
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19 # Copyright Dept of Probability Theory and Statistics TU Wien |
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20 |
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21 file = octave_tmp_file_name (); |
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22 |
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23 usage_msg = "playaudio (name [, ext]) or playaudio (X)"; |
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24 |
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25 if (nargin == 1 && is_vector (name) && ! isstr (name)) |
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26 # play a vector |
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27 [nr, nc] = size (name); |
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28 if (nc != 1) |
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29 if (nr == 1) |
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30 name = name'; |
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31 nr = nc; |
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32 else |
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33 error ("playaudio: X must be a vector"); |
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34 endif |
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35 endif |
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36 X = name + 127; |
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37 num = fopen (file, "w"); |
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38 c = fwrite (num, X, "uchar"); |
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39 fclose (num); |
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40 system (sprintf ("cat %s > /dev/dsp", file)); |
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41 unlink (file); |
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42 elseif (nargin >= 1 && isstr (name)) |
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43 # play a file |
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44 if (nargin == 1) |
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45 name = [name, ".lin"]; |
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46 elseif (nargin == 2) |
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47 name = [name, ".", ext]; |
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48 else |
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49 usage (usage_msg); |
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50 endif |
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51 if (strcmp (ext, "lin") || strcmp (ext, "raw")) |
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52 system (sprintf ("cat %s > /dev/dsp", name)); |
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53 elseif (strcmp (ext, "mu") || strcmp (ext, "au") || strcmp (ext, "snd")) |
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54 system (sprintf ("cat %s > /dev/audio", name)); |
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55 else |
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56 error ("playaudio does not support given extension"); |
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57 endif |
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58 else |
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59 usage (usage_msg); |
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60 endif |
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61 |
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62 endfunction |
