Mercurial > octave
comparison scripts/audio/saveaudio.m @ 1636:21fe2afb3692
[project @ 1995-11-16 19:16:11 by jwe]
Initial revision
| author | jwe |
|---|---|
| date | Thu, 16 Nov 1995 19:16:11 +0000 |
| parents | |
| children | 5cffc4b8de57 |
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| 1635:e91ac27650dc | 1636:21fe2afb3692 |
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| 1 function saveaudio (name, X, ext, bit) | |
| 2 | |
| 3 # usage: saveaudio (name, X, [, ext [, bit]]) | |
| 4 # | |
| 5 # Saves a vector X of audio data in the file "name.ext". | |
| 6 # The format of the audio file is determined by ext which has to be | |
| 7 # written without an inital "."; default value for ext is "lin". | |
| 8 # | |
| 9 # Currently, the following audio formats are supported: | |
| 10 # *) mu-law files with extension "mu", "au" or "snd" | |
| 11 # *) linearly encoded files with extension "lin" or "raw" | |
| 12 # If the data is saved linearly, the bit argument decides whether an | |
| 13 # 8-bit (default) or a 16-bit format is used. | |
| 14 | |
| 15 # Written by AW (Andreas.Weingessel@ci.tuwien.ac.at) on Sep 5, 1994 | |
| 16 # Last modified by AW on Oct 29, 1994 | |
| 17 # Copyright Dept of Probability Theory and Statistics TU Wien | |
| 18 | |
| 19 if (nargin < 2 || nargin > 4) | |
| 20 usage ("saveaudio (X, name [, ext [, bit]])"); | |
| 21 endif | |
| 22 | |
| 23 if (nargin == 2) | |
| 24 ext = "lin"; | |
| 25 endif | |
| 26 | |
| 27 if (nargin < 4) | |
| 28 bit = 8; | |
| 29 elseif (bit != 8 && bit != 16) | |
| 30 error ("saveaudio: bit must be either 8 or 16"); | |
| 31 endif | |
| 32 | |
| 33 [nr, nc] = size (X); | |
| 34 if (nc != 1) | |
| 35 if (nr == 1) | |
| 36 X = X'; | |
| 37 nr = nc; | |
| 38 else | |
| 39 error ("saveaudio: X must be a vector."); | |
| 40 endif | |
| 41 endif | |
| 42 | |
| 43 num = fopen ([name, ".", ext], "w"); | |
| 44 | |
| 45 if (strcmp (ext, "lin") || strcmp (ext, "raw")) | |
| 46 if (bit == 8) | |
| 47 ld = max (abs (X)); | |
| 48 if (ld > 127) # convert 16 to 8 bit | |
| 49 if (ld < 16384) | |
| 50 sc = 64 / ld; | |
| 51 else | |
| 52 sc = 1 / 256; | |
| 53 endif | |
| 54 X = fix (X * sc); | |
| 55 endif | |
| 56 X = X + 127; | |
| 57 c = fwrite (num, X, "uchar"); | |
| 58 else | |
| 59 c = fwrite (num, X, "short"); | |
| 60 endif | |
| 61 elseif (strcmp (ext, "mu") || strcmp (ext, "au") || strcmp (ext, "snd")) | |
| 62 Y = lin2mu (X); | |
| 63 c = fwrite (num, Y, "uchar"); | |
| 64 else | |
| 65 fclose (num); | |
| 66 error ("saveaudio does not support given extension"); | |
| 67 endif | |
| 68 | |
| 69 fclose (num); | |
| 70 | |
| 71 endfunction |