Mercurial > octave
view scripts/audio/saveaudio.m @ 1636:21fe2afb3692
[project @ 1995-11-16 19:16:11 by jwe]
Initial revision
author | jwe |
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date | Thu, 16 Nov 1995 19:16:11 +0000 |
parents | |
children | 5cffc4b8de57 |
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function saveaudio (name, X, ext, bit) # usage: saveaudio (name, X, [, ext [, bit]]) # # Saves a vector X of audio data in the file "name.ext". # The format of the audio file is determined by ext which has to be # written without an inital "."; default value for ext is "lin". # # Currently, the following audio formats are supported: # *) mu-law files with extension "mu", "au" or "snd" # *) linearly encoded files with extension "lin" or "raw" # If the data is saved linearly, the bit argument decides whether an # 8-bit (default) or a 16-bit format is used. # Written by AW (Andreas.Weingessel@ci.tuwien.ac.at) on Sep 5, 1994 # Last modified by AW on Oct 29, 1994 # Copyright Dept of Probability Theory and Statistics TU Wien if (nargin < 2 || nargin > 4) usage ("saveaudio (X, name [, ext [, bit]])"); endif if (nargin == 2) ext = "lin"; endif if (nargin < 4) bit = 8; elseif (bit != 8 && bit != 16) error ("saveaudio: bit must be either 8 or 16"); endif [nr, nc] = size (X); if (nc != 1) if (nr == 1) X = X'; nr = nc; else error ("saveaudio: X must be a vector."); endif endif num = fopen ([name, ".", ext], "w"); if (strcmp (ext, "lin") || strcmp (ext, "raw")) if (bit == 8) ld = max (abs (X)); if (ld > 127) # convert 16 to 8 bit if (ld < 16384) sc = 64 / ld; else sc = 1 / 256; endif X = fix (X * sc); endif X = X + 127; c = fwrite (num, X, "uchar"); else c = fwrite (num, X, "short"); endif elseif (strcmp (ext, "mu") || strcmp (ext, "au") || strcmp (ext, "snd")) Y = lin2mu (X); c = fwrite (num, Y, "uchar"); else fclose (num); error ("saveaudio does not support given extension"); endif fclose (num); endfunction