annotate scripts/audio/wavread.m @ 14868:5d3a684236b0

maint: Use Octave coding conventions for cuddling parentheses in scripts directory * lin2mu.m, loadaudio.m, wavread.m, accumarray.m, bicubic.m, celldisp.m, colon.m, cplxpair.m, dblquad.m, divergence.m, genvarname.m, gradient.m, int2str.m, interp1.m, interp1q.m, interp2.m, interpn.m, loadobj.m, nthargout.m, __isequal__.m, __splinen__.m, quadgk.m, quadl.m, quadv.m, rat.m, rot90.m, rotdim.m, saveobj.m, subsindex.m, triplequad.m, delaunay3.m, griddata.m, inpolygon.m, tsearchn.m, voronoi.m, get_first_help_sentence.m, which.m, gray2ind.m, pink.m, dlmwrite.m, strread.m, textread.m, textscan.m, housh.m, ishermitian.m, issymmetric.m, krylov.m, logm.m, null.m, rref.m, compare_versions.m, copyfile.m, dump_prefs.m, edit.m, fileparts.m, getappdata.m, isappdata.m, movefile.m, orderfields.m, parseparams.m, __xzip__.m, rmappdata.m, setappdata.m, swapbytes.m, unpack.m, ver.m, fminbnd.m, fminunc.m, fsolve.m, glpk.m, lsqnonneg.m, qp.m, sqp.m, configure_make.m, copy_files.m, describe.m, get_description.m, get_forge_pkg.m, install.m, installed_packages.m, is_architecture_dependent.m, load_package_dirs.m, print_package_description.m, rebuild.m, repackage.m, save_order.m, shell.m, allchild.m, ancestor.m, area.m, axes.m, axis.m, clabel.m, close.m, colorbar.m, comet.m, comet3.m, contour.m, cylinder.m, ezmesh.m, ezsurf.m, findobj.m, fplot.m, hist.m, isocolors.m, isonormals.m, isosurface.m, isprop.m, legend.m, mesh.m, meshz.m, pareto.m, pcolor.m, peaks.m, plot3.m, plotmatrix.m, plotyy.m, polar.m, print.m, __add_datasource__.m, __add_default_menu__.m, __axes_limits__.m, __bar__.m, __clabel__.m, __contour__.m, __errcomm__.m, __errplot__.m, __ezplot__.m, __file_filter__.m, __fltk_print__.m, __ghostscript__.m, __gnuplot_print__.m, __go_draw_axes__.m, __go_draw_figure__.m, __interp_cube__.m, __marching_cube__.m, __patch__.m, __pie__.m, __plt__.m, __print_parse_opts__.m, __quiver__.m, __scatter__.m, __stem__.m, __tight_eps_bbox__.m, __uigetdir_fltk__.m, __uigetfile_fltk__.m, __uiputfile_fltk__.m, quiver.m, quiver3.m, rectangle.m, refreshdata.m, ribbon.m, scatter.m, semilogy.m, shading.m, slice.m, subplot.m, surface.m, surfl.m, surfnorm.m, text.m, uigetfile.m, uiputfile.m, whitebg.m, deconv.m, mkpp.m, pchip.m, polyaffine.m, polyder.m, polygcd.m, polyout.m, polyval.m, ppint.m, ppjumps.m, ppval.m, residue.m, roots.m, spline.m, splinefit.m, addpref.m, getpref.m, setpref.m, ismember.m, setxor.m, arch_fit.m, arch_rnd.m, arch_test.m, autoreg_matrix.m, diffpara.m, fftconv.m, filter2.m, hanning.m, hurst.m, periodogram.m, triangle_sw.m, sinc.m, spectral_xdf.m, spencer.m, stft.m, synthesis.m, unwrap.m, yulewalker.m, bicgstab.m, gmres.m, pcg.m, pcr.m, __sprand_impl__.m, speye.m, spfun.m, sprandn.m, spstats.m, svds.m, treelayout.m, treeplot.m, bessel.m, factor.m, legendre.m, perms.m, primes.m, magic.m, toeplitz.m, corr.m, cov.m, mean.m, median.m, mode.m, qqplot.m, quantile.m, ranks.m, zscore.m, logistic_regression_likelihood.m, bartlett_test.m, chisquare_test_homogeneity.m, chisquare_test_independence.m, kolmogorov_smirnov_test.m, run_test.m, u_test.m, wilcoxon_test.m, z_test.m, z_test_2.m, bin2dec.m, dec2base.m, mat2str.m, strcat.m, strchr.m, strjust.m, strtok.m, substr.m, untabify.m, assert.m, demo.m, example.m, fail.m, speed.m, test.m, now.m: Use Octave coding conventions for cuddling parentheses in scripts directory.
author Rik <octave@nomad.inbox5.com>
date Tue, 17 Jul 2012 07:08:39 -0700
parents f3d52523cde1
children 203c78063bff
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2005-2012 Michael Zeising
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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 3 of the License, or (at
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8 ## your option) 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, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {@var{y} =} wavread (@var{filename})
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21 ## Load the RIFF/WAVE sound file @var{filename}, and return the samples
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22 ## in vector @var{y}. If the file contains multichannel data, then
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23 ## @var{y} is a matrix with the channels represented as columns.
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24 ##
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25 ## @deftypefnx {Function File} {[@var{y}, @var{Fs}, @var{bps}] =} wavread (@var{filename})
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26 ## Additionally return the sample rate (@var{fs}) in Hz and the number of bits
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27 ## per sample (@var{bps}).
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28 ##
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29 ## @deftypefnx {Function File} {[@dots{}] =} wavread (@var{filename}, @var{n})
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30 ## Read only the first @var{n} samples from each channel.
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31 ##
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32 ## @deftypefnx {Function File} {[@dots{}] =} wavread (@var{filename}, @var{n1} @var{n2})
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33 ## Read only samples @var{n1} through @var{n2} from each channel.
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34 ##
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35 ## @deftypefnx {Function File} {[@var{samples}, @var{channels}] =} wavread (@var{filename}, "size")
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36 ## Return the number of samples (@var{n}) and channels (@var{ch})
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37 ## instead of the audio data.
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38 ## @seealso{wavwrite}
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39 ## @end deftypefn
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40
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41 ## Author: Michael Zeising <michael@michaels-website.de>
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42 ## Created: 06 December 2005
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43
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44 function [y, samples_per_sec, bits_per_sample] = wavread (filename, param)
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45
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46 FORMAT_PCM = 0x0001; # PCM (8/16/32 bit)
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47 FORMAT_IEEE_FLOAT = 0x0003; # IEEE float (32/64 bit)
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48 BYTEORDER = "ieee-le";
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49
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50 if (nargin < 1 || nargin > 2)
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51 print_usage ();
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52 endif
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53
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54 if (! ischar (filename))
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55 error ("wavread: FILENAME must be a character string");
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56 endif
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57
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58 fid = -1;
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59
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60 unwind_protect
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61
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62 [fid, msg] = fopen (filename, "rb");
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63
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64 if (fid < 0)
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65 error ("wavread: %s", msg);
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66 endif
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67
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68 ## Get file size.
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69 fseek (fid, 0, "eof");
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70 file_size = ftell (fid);
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71 fseek (fid, 0, "bof");
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72
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73 ## Find RIFF chunk.
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74 riff_size = find_chunk (fid, "RIFF", file_size);
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75 riff_pos = ftell (fid);
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76 if (riff_size == -1)
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77 error ("wavread: file contains no RIFF chunk");
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78 endif
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79
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80 riff_type = char (fread (fid, 4))';
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81 if (! strcmp (riff_type, "WAVE"))
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82 error ("wavread: file contains no WAVE signature");
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83 endif
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84 riff_pos = riff_pos + 4;
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85 riff_size = riff_size - 4;
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86
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87 ## Find format chunk inside the RIFF chunk.
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88 fseek (fid, riff_pos, "bof");
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89 fmt_size = find_chunk (fid, "fmt ", riff_size);
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90 fmt_pos = ftell (fid);
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91 if (fmt_size == -1)
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92 error ("wavread: file contains no format chunk");
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93 endif
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94
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95 ## Find data chunk inside the RIFF chunk.
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96 ## We don't assume that it comes after the format chunk.
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97 fseek (fid, riff_pos, "bof");
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98 data_size = find_chunk (fid, "data", riff_size);
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99 data_pos = ftell (fid);
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100 if (data_size == -1)
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101 error ("wavread: file contains no data chunk");
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102 endif
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103
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104 ### Read format chunk.
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105 fseek (fid, fmt_pos, "bof");
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106
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107 ## Sample format code.
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108 format_tag = fread (fid, 1, "uint16", 0, BYTEORDER);
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109 if (format_tag != FORMAT_PCM && format_tag != FORMAT_IEEE_FLOAT)
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110 error ("wavread: sample format %#x is not supported", format_tag);
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John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
111 endif
11587
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parents: 11563
diff changeset
112
13003
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
113 ## Number of interleaved channels.
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John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
114 channels = fread (fid, 1, "uint16", 0, BYTEORDER);
5567
80e629357483 [project @ 2005-12-07 06:31:28 by jwe]
jwe
parents: 5566
diff changeset
115
13003
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
116 ## Sample rate.
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
117 samples_per_sec = fread (fid, 1, "uint32", 0, BYTEORDER);
5567
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jwe
parents: 5566
diff changeset
118
13003
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
119 ## Bits per sample.
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
120 fseek (fid, 6, "cof");
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
121 bits_per_sample = fread (fid, 1, "uint16", 0, BYTEORDER);
5567
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jwe
parents: 5566
diff changeset
122
13003
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
123 ### Read data chunk.
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
124 fseek (fid, data_pos, "bof");
5567
80e629357483 [project @ 2005-12-07 06:31:28 by jwe]
jwe
parents: 5566
diff changeset
125
13003
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
126 ## Determine sample data type.
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
127 if (format_tag == FORMAT_PCM)
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
128 switch (bits_per_sample)
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
129 case 8
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
130 format = "uint8";
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
131 case 16
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
132 format = "int16";
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
133 case 24
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
134 format = "uint8";
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
135 case 32
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
136 format = "int32";
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
137 otherwise
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
138 error ("wavread: %d bits sample resolution is not supported with PCM",
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
139 bits_per_sample);
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
140 endswitch
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
141 else
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
142 switch (bits_per_sample)
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
143 case 32
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
144 format = "float32";
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
145 case 64
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
146 format = "float64";
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
147 otherwise
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
148 error ("wavread: %d bits sample resolution is not supported with IEEE float",
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
149 bits_per_sample);
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
150 endswitch
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
151 endif
11587
c792872f8942 all script files: untabify and strip trailing whitespace
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parents: 11563
diff changeset
152
13003
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
153 ## Parse arguments.
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
154 if (nargin == 1)
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
155 length = idivide (8 * data_size, bits_per_sample);
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
156 else
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
157 nparams = numel (param);
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
158 if (nparams == 1)
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
159 ## Number of samples is given.
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
160 length = param * channels;
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
161 elseif (nparams == 2)
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
162 ## Sample range is given.
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
163 if (fseek (fid, (param(1)-1) * channels * (bits_per_sample/8), "cof") < 0)
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
164 warning ("wavread: seeking failed");
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
165 endif
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
166 length = (param(2)-param(1)+1) * channels;
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
167 elseif (nparams == 4 && char (param) == "size")
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
168 ## Size of the file is requested.
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
169 tmp = idivide (8 * data_size, channels * bits_per_sample);
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
170 y = [tmp, channels];
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
171 return;
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
172 else
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
173 error ("wavread: invalid PARAM argument");
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
174 endif
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
175 endif
11587
c792872f8942 all script files: untabify and strip trailing whitespace
John W. Eaton <jwe@octave.org>
parents: 11563
diff changeset
176
13003
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
177 ## Read samples and close file.
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
178 if (bits_per_sample == 24)
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
179 length *= 3;
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
180 endif
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
181
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
182 [yi, n] = fread (fid, length, format, 0, BYTEORDER);
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
183
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
184 unwind_protect_cleanup
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
185
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
186 if (fid >= 0)
5565
2eeed655e801 [project @ 2005-12-06 20:38:20 by jwe]
jwe
parents:
diff changeset
187 fclose (fid);
2eeed655e801 [project @ 2005-12-06 20:38:20 by jwe]
jwe
parents:
diff changeset
188 endif
5839
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
189
13003
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
190 end_unwind_protect
5839
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
191
8506
bc982528de11 comment style fixes
John W. Eaton <jwe@octave.org>
parents: 7461
diff changeset
192 ## Check data.
6304
78a3254741b2 [project @ 2007-02-14 21:22:59 by jwe]
jwe
parents: 6046
diff changeset
193 if (mod (numel (yi), channels) != 0)
78a3254741b2 [project @ 2007-02-14 21:22:59 by jwe]
jwe
parents: 6046
diff changeset
194 error ("wavread: data in %s doesn't match the number of channels",
10549
95c3e38098bf Untabify .m scripts
Rik <code@nomad.inbox5.com>
parents: 9598
diff changeset
195 filename);
6304
78a3254741b2 [project @ 2007-02-14 21:22:59 by jwe]
jwe
parents: 6046
diff changeset
196 endif
78a3254741b2 [project @ 2007-02-14 21:22:59 by jwe]
jwe
parents: 6046
diff changeset
197
5839
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
198 if (bits_per_sample == 24)
14868
5d3a684236b0 maint: Use Octave coding conventions for cuddling parentheses in scripts directory
Rik <octave@nomad.inbox5.com>
parents: 14363
diff changeset
199 yi = reshape (yi, 3, rows (yi) / 3)';
5839
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
200 yi(yi(:,3) >= 128, 3) -= 256;
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
201 yi = yi * [1; 256; 65536];
7151
aeeb646f6538 [project @ 2007-11-09 19:34:17 by jwe]
jwe
parents: 7117
diff changeset
202 endif
aeeb646f6538 [project @ 2007-11-09 19:34:17 by jwe]
jwe
parents: 7117
diff changeset
203
5567
80e629357483 [project @ 2005-12-07 06:31:28 by jwe]
jwe
parents: 5566
diff changeset
204 if (format_tag == FORMAT_PCM)
8506
bc982528de11 comment style fixes
John W. Eaton <jwe@octave.org>
parents: 7461
diff changeset
205 ## Normalize samples.
5567
80e629357483 [project @ 2005-12-07 06:31:28 by jwe]
jwe
parents: 5566
diff changeset
206 switch (bits_per_sample)
5565
2eeed655e801 [project @ 2005-12-06 20:38:20 by jwe]
jwe
parents:
diff changeset
207 case 8
12701
de3e90a420e3 Overhaul wavwrite, wavread and fix normalization problem (Bug #33420).
Rik <octave@nomad.inbox5.com>
parents: 11587
diff changeset
208 yi = (yi - 128)/128;
5572
c45cf76df06f [project @ 2005-12-12 20:54:06 by jwe]
jwe
parents: 5567
diff changeset
209 case 16
12701
de3e90a420e3 Overhaul wavwrite, wavread and fix normalization problem (Bug #33420).
Rik <octave@nomad.inbox5.com>
parents: 11587
diff changeset
210 yi /= 32768;
5839
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
211 case 24
12701
de3e90a420e3 Overhaul wavwrite, wavread and fix normalization problem (Bug #33420).
Rik <octave@nomad.inbox5.com>
parents: 11587
diff changeset
212 yi /= 8388608;
5572
c45cf76df06f [project @ 2005-12-12 20:54:06 by jwe]
jwe
parents: 5567
diff changeset
213 case 32
12701
de3e90a420e3 Overhaul wavwrite, wavread and fix normalization problem (Bug #33420).
Rik <octave@nomad.inbox5.com>
parents: 11587
diff changeset
214 yi /= 2147483648;
5565
2eeed655e801 [project @ 2005-12-06 20:38:20 by jwe]
jwe
parents:
diff changeset
215 endswitch
2eeed655e801 [project @ 2005-12-06 20:38:20 by jwe]
jwe
parents:
diff changeset
216 endif
11587
c792872f8942 all script files: untabify and strip trailing whitespace
John W. Eaton <jwe@octave.org>
parents: 11563
diff changeset
217
8506
bc982528de11 comment style fixes
John W. Eaton <jwe@octave.org>
parents: 7461
diff changeset
218 ## Deinterleave.
5567
80e629357483 [project @ 2005-12-07 06:31:28 by jwe]
jwe
parents: 5566
diff changeset
219 nr = numel (yi) / channels;
80e629357483 [project @ 2005-12-07 06:31:28 by jwe]
jwe
parents: 5566
diff changeset
220 y = reshape (yi, channels, nr)';
11587
c792872f8942 all script files: untabify and strip trailing whitespace
John W. Eaton <jwe@octave.org>
parents: 11563
diff changeset
221
5565
2eeed655e801 [project @ 2005-12-06 20:38:20 by jwe]
jwe
parents:
diff changeset
222 endfunction
8796
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
223
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
224 ## Given a chunk_id, scan through chunks from the current file position
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
225 ## though at most size bytes. Return the size of the found chunk, with
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
226 ## file position pointing to the start of the chunk data. Return -1 for
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
227 ## size if chunk is not found.
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
228
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
229 function chunk_size = find_chunk (fid, chunk_id, size)
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
230 id = "";
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
231 offset = 8;
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
232 chunk_size = 0;
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
233
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
234 while (! strcmp (id, chunk_id) && (offset < size))
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
235 fseek (fid, chunk_size, "cof");
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
236 id = char (fread (fid, 4))';
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
237 chunk_size = fread (fid, 1, "uint32", 0, "ieee-le");
10738
a4b8364e04c7 wavread.m: Correctly handle non-word aligned chunks (bug #30309).
Rik <octave@nomad.inbox5.com>
parents: 10635
diff changeset
238 ## Chunk sizes must be word-aligned (2 byte)
11587
c792872f8942 all script files: untabify and strip trailing whitespace
John W. Eaton <jwe@octave.org>
parents: 11563
diff changeset
239 chunk_size += rem (chunk_size, 2);
8796
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
240 offset = offset + 8 + chunk_size;
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
241 endwhile
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
242 if (! strcmp (id, chunk_id))
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
243 chunk_size = -1;
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
244 endif
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
245 endfunction
12701
de3e90a420e3 Overhaul wavwrite, wavread and fix normalization problem (Bug #33420).
Rik <octave@nomad.inbox5.com>
parents: 11587
diff changeset
246
14363
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248 ## Mark file as tested. Tests for wavread/wavwrite pair are in wavwrite.m.
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249 %!assert (1)
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