Mercurial > octave-nkf
annotate scripts/audio/loadaudio.m @ 12312:b10ea6efdc58 release-3-4-x ss-3-3-91
version is now 3.3.91
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Mon, 31 Jan 2011 08:36:58 -0500 |
| parents | fd0a3ac60b0e |
| children | d0b799dafede |
| rev | line source |
|---|---|
| 11523 | 1 ## Copyright (C) 1995-2011 John W. Eaton |
| 2313 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
| 8 ## your option) any later version. | |
| 2313 | 9 ## |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 7016 | 16 ## along with Octave; see the file COPYING. If not, see |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 2303 | 18 |
| 3332 | 19 ## -*- texinfo -*- |
| 20 ## @deftypefn {Function File} {} loadaudio (@var{name}, @var{ext}, @var{bps}) | |
| 21 ## Loads audio data from the file @file{@var{name}.@var{ext}} into the | |
| 3426 | 22 ## vector @var{x}. |
| 2311 | 23 ## |
| 3332 | 24 ## The extension @var{ext} determines how the data in the audio file is |
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25 ## interpreted; the extensions @file{lin} (default) and @file{raw} |
| 3332 | 26 ## correspond to linear, the extensions @file{au}, @file{mu}, or @file{snd} |
| 27 ## to mu-law encoding. | |
| 3426 | 28 ## |
| 3332 | 29 ## The argument @var{bps} can be either 8 (default) or 16, and specifies |
| 30 ## the number of bits per sample used in the audio file. | |
| 5642 | 31 ## @seealso{lin2mu, mu2lin, saveaudio, playaudio, setaudio, record} |
| 3332 | 32 ## @end deftypefn |
| 5642 | 33 |
| 2311 | 34 |
| 2312 | 35 ## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at> |
| 36 ## Created: 10 April 1994 | |
| 37 ## Adapted-By: jwe | |
| 38 | |
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Rik <octave@nomad.inbox5.com>
parents:
10793
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39 function X = loadaudio (name, ext, bps) |
| 2325 | 40 |
| 1636 | 41 if (nargin == 0 || nargin > 3) |
| 6046 | 42 print_usage (); |
| 1636 | 43 endif |
| 44 | |
| 45 if (nargin == 1) | |
| 46 ext = "lin"; | |
| 47 endif | |
| 48 | |
| 49 if (nargin < 3) | |
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11469
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Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
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50 bps = 8; |
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c776f063fefe
Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
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51 elseif (bps != 8 && bps != 16) |
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Rik <octave@nomad.inbox5.com>
parents:
11469
diff
changeset
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52 error ("loadaudio: BPS must be either 8 or 16"); |
| 1636 | 53 endif |
| 54 | |
| 55 name = [name, ".", ext]; | |
| 3167 | 56 num = fopen (name, "rb"); |
| 1636 | 57 |
| 3167 | 58 if (strcmp (ext, "lin") || strcmp (ext, "raw") || strcmp (ext, "pcm")) |
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11469
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Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
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59 if (bps == 8) |
| 1636 | 60 [Y, c] = fread (num, inf, "uchar"); |
| 61 X = Y - 127; | |
| 62 else | |
| 63 [X, c] = fread (num, inf, "short"); | |
| 64 endif | |
| 3471 | 65 elseif (strcmp (ext, "mu") || strcmp (ext, "au") |
| 10549 | 66 || strcmp (ext, "snd") || strcmp(ext, "ul")) |
| 1636 | 67 [Y, c] = fread (num, inf, "uchar"); |
| 2303 | 68 ## remove file header |
| 6024 | 69 m = find (Y(1:64) == 0, 1, "last"); |
| 1636 | 70 if (! isempty (m)) |
| 71 Y(1:m) = []; | |
| 72 endif | |
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11469
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Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
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73 X = mu2lin (Y, bps); |
| 1636 | 74 else |
| 75 fclose (num); | |
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Print name of function in error() string messages.
Rik <octave@nomad.inbox5.com>
parents:
10549
diff
changeset
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76 error ("loadaudio: unsupported extension"); |
| 1636 | 77 endif |
| 78 | |
| 79 fclose (num); | |
| 2325 | 80 |
| 1636 | 81 endfunction |