Mercurial > octave-nkf
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 |
rev | line source |
---|---|
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1 ## Copyright (C) 2005-2012 Michael Zeising |
5565 | 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. | |
5565 | 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/>. | |
5565 | 18 |
19 ## -*- texinfo -*- | |
6547 | 20 ## @deftypefn {Function File} {@var{y} =} wavread (@var{filename}) |
5567 | 21 ## Load the RIFF/WAVE sound file @var{filename}, and return the samples |
22 ## in vector @var{y}. If the file contains multichannel data, then | |
23 ## @var{y} is a matrix with the channels represented as columns. | |
5565 | 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}). |
5565 | 28 ## |
6547 | 29 ## @deftypefnx {Function File} {[@dots{}] =} wavread (@var{filename}, @var{n}) |
5565 | 30 ## Read only the first @var{n} samples from each channel. |
31 ## | |
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32 ## @deftypefnx {Function File} {[@dots{}] =} wavread (@var{filename}, @var{n1} @var{n2}) |
5565 | 33 ## Read only samples @var{n1} through @var{n2} from each channel. |
34 ## | |
6547 | 35 ## @deftypefnx {Function File} {[@var{samples}, @var{channels}] =} wavread (@var{filename}, "size") |
5567 | 36 ## Return the number of samples (@var{n}) and channels (@var{ch}) |
37 ## instead of the audio data. | |
5642 | 38 ## @seealso{wavwrite} |
5565 | 39 ## @end deftypefn |
40 | |
7117 | 41 ## Author: Michael Zeising <michael@michaels-website.de> |
5565 | 42 ## Created: 06 December 2005 |
43 | |
5567 | 44 function [y, samples_per_sec, bits_per_sample] = wavread (filename, param) |
45 | |
5565 | 46 FORMAT_PCM = 0x0001; # PCM (8/16/32 bit) |
47 FORMAT_IEEE_FLOAT = 0x0003; # IEEE float (32/64 bit) | |
48 BYTEORDER = "ieee-le"; | |
49 | |
5567 | 50 if (nargin < 1 || nargin > 2) |
6046 | 51 print_usage (); |
5567 | 52 endif |
53 | |
54 if (! ischar (filename)) | |
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55 error ("wavread: FILENAME must be a character string"); |
5567 | 56 endif |
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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111 endif |
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112 |
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113 ## Number of interleaved channels. |
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114 channels = fread (fid, 1, "uint16", 0, BYTEORDER); |
5567 | 115 |
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116 ## Sample rate. |
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117 samples_per_sec = fread (fid, 1, "uint32", 0, BYTEORDER); |
5567 | 118 |
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119 ## Bits per sample. |
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120 fseek (fid, 6, "cof"); |
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121 bits_per_sample = fread (fid, 1, "uint16", 0, BYTEORDER); |
5567 | 122 |
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123 ### Read data chunk. |
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124 fseek (fid, data_pos, "bof"); |
5567 | 125 |
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126 ## Determine sample data type. |
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127 if (format_tag == FORMAT_PCM) |
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128 switch (bits_per_sample) |
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129 case 8 |
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130 format = "uint8"; |
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131 case 16 |
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132 format = "int16"; |
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133 case 24 |
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134 format = "uint8"; |
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135 case 32 |
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136 format = "int32"; |
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137 otherwise |
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138 error ("wavread: %d bits sample resolution is not supported with PCM", |
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139 bits_per_sample); |
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140 endswitch |
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141 else |
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142 switch (bits_per_sample) |
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143 case 32 |
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144 format = "float32"; |
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145 case 64 |
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146 format = "float64"; |
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147 otherwise |
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148 error ("wavread: %d bits sample resolution is not supported with IEEE float", |
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149 bits_per_sample); |
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150 endswitch |
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151 endif |
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152 |
13003
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153 ## Parse arguments. |
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154 if (nargin == 1) |
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155 length = idivide (8 * data_size, bits_per_sample); |
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156 else |
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157 nparams = numel (param); |
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158 if (nparams == 1) |
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159 ## Number of samples is given. |
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160 length = param * channels; |
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161 elseif (nparams == 2) |
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162 ## Sample range is given. |
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163 if (fseek (fid, (param(1)-1) * channels * (bits_per_sample/8), "cof") < 0) |
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164 warning ("wavread: seeking failed"); |
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165 endif |
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166 length = (param(2)-param(1)+1) * channels; |
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167 elseif (nparams == 4 && char (param) == "size") |
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168 ## Size of the file is requested. |
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169 tmp = idivide (8 * data_size, channels * bits_per_sample); |
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170 y = [tmp, channels]; |
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171 return; |
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172 else |
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173 error ("wavread: invalid PARAM argument"); |
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174 endif |
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175 endif |
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176 |
13003
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177 ## Read samples and close file. |
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178 if (bits_per_sample == 24) |
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179 length *= 3; |
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180 endif |
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181 |
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182 [yi, n] = fread (fid, length, format, 0, BYTEORDER); |
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183 |
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184 unwind_protect_cleanup |
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185 |
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186 if (fid >= 0) |
5565 | 187 fclose (fid); |
188 endif | |
5839 | 189 |
13003
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190 end_unwind_protect |
5839 | 191 |
8506 | 192 ## Check data. |
6304 | 193 if (mod (numel (yi), channels) != 0) |
194 error ("wavread: data in %s doesn't match the number of channels", | |
10549 | 195 filename); |
6304 | 196 endif |
197 | |
5839 | 198 if (bits_per_sample == 24) |
14868
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199 yi = reshape (yi, 3, rows (yi) / 3)'; |
5839 | 200 yi(yi(:,3) >= 128, 3) -= 256; |
201 yi = yi * [1; 256; 65536]; | |
7151 | 202 endif |
203 | |
5567 | 204 if (format_tag == FORMAT_PCM) |
8506 | 205 ## Normalize samples. |
5567 | 206 switch (bits_per_sample) |
5565 | 207 case 8 |
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Overhaul wavwrite, wavread and fix normalization problem (Bug #33420).
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208 yi = (yi - 128)/128; |
5572 | 209 case 16 |
12701
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Overhaul wavwrite, wavread and fix normalization problem (Bug #33420).
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diff
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210 yi /= 32768; |
5839 | 211 case 24 |
12701
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Overhaul wavwrite, wavread and fix normalization problem (Bug #33420).
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212 yi /= 8388608; |
5572 | 213 case 32 |
12701
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Overhaul wavwrite, wavread and fix normalization problem (Bug #33420).
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214 yi /= 2147483648; |
5565 | 215 endswitch |
216 endif | |
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217 |
8506 | 218 ## Deinterleave. |
5567 | 219 nr = numel (yi) / channels; |
220 y = reshape (yi, channels, nr)'; | |
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221 |
5565 | 222 endfunction |
8796
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223 |
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diff
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224 ## Given a chunk_id, scan through chunks from the current file position |
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225 ## though at most size bytes. Return the size of the found chunk, with |
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226 ## file position pointing to the start of the chunk data. Return -1 for |
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227 ## size if chunk is not found. |
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228 |
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diff
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229 function chunk_size = find_chunk (fid, chunk_id, size) |
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diff
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230 id = ""; |
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231 offset = 8; |
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232 chunk_size = 0; |
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233 |
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234 while (! strcmp (id, chunk_id) && (offset < size)) |
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235 fseek (fid, chunk_size, "cof"); |
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236 id = char (fread (fid, 4))'; |
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237 chunk_size = fread (fid, 1, "uint32", 0, "ieee-le"); |
10738
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wavread.m: Correctly handle non-word aligned chunks (bug #30309).
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diff
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|
238 ## Chunk sizes must be word-aligned (2 byte) |
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239 chunk_size += rem (chunk_size, 2); |
8796
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wavread.m: improve search for data chunks
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240 offset = offset + 8 + chunk_size; |
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241 endwhile |
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242 if (! strcmp (id, chunk_id)) |
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243 chunk_size = -1; |
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244 endif |
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|
245 endfunction |
12701
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Overhaul wavwrite, wavread and fix normalization problem (Bug #33420).
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diff
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|
246 |
14363
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Use Octave coding conventions in all m-file %!test blocks
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diff
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|
247 |
f3d52523cde1
Use Octave coding conventions in all m-file %!test blocks
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diff
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|
248 ## Mark file as tested. Tests for wavread/wavwrite pair are in wavwrite.m. |
14868
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diff
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|
249 %!assert (1) |
14363
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Use Octave coding conventions in all m-file %!test blocks
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diff
changeset
|
250 |