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annotate scripts/audio/wavread.m @ 19790:446c46af4b42 stable

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strip trailing whitespace from most source files * Makefile.am, NEWS, build-aux/common.mk, configure.ac, doc/Makefile.am, doc/doxyhtml/Makefile.am, doc/interpreter/Makefile.am, doc/interpreter/arith.txi, doc/interpreter/audio.txi, doc/interpreter/basics.txi, doc/interpreter/bugs.txi, doc/interpreter/container.txi, doc/interpreter/cp-idx.txi, doc/interpreter/data.txi, doc/interpreter/debug.txi, doc/interpreter/diagperm.txi, doc/interpreter/diffeq.txi, doc/interpreter/doccheck/README, doc/interpreter/doccheck/spellcheck, doc/interpreter/emacs.txi, doc/interpreter/errors.txi, doc/interpreter/eval.txi, doc/interpreter/expr.txi, doc/interpreter/external.txi, doc/interpreter/fn-idx.txi, doc/interpreter/func.txi, doc/interpreter/geometry.txi, doc/interpreter/geometryimages.m, doc/interpreter/gpl.txi, doc/interpreter/grammar.txi, doc/interpreter/gui.txi, doc/interpreter/image.txi, doc/interpreter/install.txi, doc/interpreter/interp.txi, doc/interpreter/interpimages.m, 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scripts/statistics/distributions/unifrnd.m, scripts/statistics/distributions/wblrnd.m, scripts/statistics/models/module.mk, scripts/statistics/tests/kruskal_wallis_test.m, scripts/strings/base2dec.m, scripts/strings/deblank.m, scripts/strings/dec2base.m, scripts/strings/dec2bin.m, scripts/strings/dec2hex.m, scripts/strings/mat2str.m, scripts/strings/ostrsplit.m, scripts/strings/regexptranslate.m, scripts/strings/str2num.m, scripts/strings/strcat.m, scripts/strings/strjoin.m, scripts/strings/strsplit.m, scripts/strings/strtok.m, scripts/strings/strtrim.m, scripts/strings/strtrunc.m, scripts/strings/substr.m, scripts/testfun/__run_test_suite__.m, scripts/testfun/speed.m, scripts/testfun/test.m, scripts/time/asctime.m, scripts/time/datenum.m, scripts/time/datevec.m, scripts/time/weekday.m, src/Makefile.am, test/Makefile.am, test/build-bc-overload-tests.sh, test/build-sparse-tests.sh, test/jit.tst, test/line-continue.tst: Strip trailing whitespace.
author John W. Eaton <jwe@octave.org>
date Tue, 20 Jan 2015 08:26:57 -0500
parents d63878346099
children 4197fc428c7d
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1 ## Copyright (C) 2005-2013 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 ## @deftypefnx {Function File} {[@var{y}, @var{Fs}, @var{bps}] =} wavread (@var{filename})
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22 ## @deftypefnx {Function File} {[@dots{}] =} wavread (@var{filename}, @var{n})
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23 ## @deftypefnx {Function File} {[@dots{}] =} wavread (@var{filename}, [@var{n1} @var{n2}])
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24 ## @deftypefnx {Function File} {[@var{samples}, @var{channels}] =} wavread (@var{filename}, "size")
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25 ##
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26 ## Load the RIFF/WAVE sound file @var{filename}, and return the samples
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27 ## in vector @var{y}. If the file contains multichannel data, then
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28 ## @var{y} is a matrix with the channels represented as columns.
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29 ##
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30 ## @code{[@var{y}, @var{Fs}, @var{bps}] = wavread (@var{filename})}
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diff changeset
31 ##
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32 ## Additionally return the sample rate (@var{fs}) in Hz and the number of bits
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33 ## per sample (@var{bps}).
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34 ##
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35 ## @code{[@dots{}] = wavread (@var{filename}, @var{n})}
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36 ##
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37 ## Read only the first @var{n} samples from each channel.
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38 ##
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39 ## @code{wavread (@var{filename}, [@var{n1} @var{n2}])}
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40 ##
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41 ## Read only samples @var{n1} through @var{n2} from each channel.
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42 ##
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43 ## @code{[@var{samples}, @var{channels}] = wavread (@var{filename}, "size")}
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44 ##
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45 ## Return the number of samples (@var{n}) and number of channels (@var{ch})
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46 ## instead of the audio data.
5642
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47 ## @seealso{wavwrite}
5565
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48 ## @end deftypefn
2eeed655e801 [project @ 2005-12-06 20:38:20 by jwe]
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49
7117
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diff changeset
50 ## Author: Michael Zeising <michael@michaels-website.de>
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diff changeset
51 ## Created: 06 December 2005
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52
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diff changeset
53 function [y, samples_per_sec, bits_per_sample] = wavread (filename, param)
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diff changeset
54
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55 FORMAT_PCM = 0x0001; # PCM (8/16/32 bit)
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diff changeset
56 FORMAT_IEEE_FLOAT = 0x0003; # IEEE float (32/64 bit)
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diff changeset
57 BYTEORDER = "ieee-le";
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58
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59 if (nargin < 1 || nargin > 2)
6046
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diff changeset
60 print_usage ();
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61 endif
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62
80e629357483 [project @ 2005-12-07 06:31:28 by jwe]
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diff changeset
63 if (! ischar (filename))
10738
a4b8364e04c7 wavread.m: Correctly handle non-word aligned chunks (bug #30309).
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parents: 10635
diff changeset
64 error ("wavread: FILENAME must be a character string");
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65 endif
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66
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67 fid = -1;
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68
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69 unwind_protect
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70
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71 [fid, msg] = fopen (filename, "rb");
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72
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73 if (fid < 0)
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74 error ("wavread: %s", msg);
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75 endif
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76
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77 ## Get file size.
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78 fseek (fid, 0, "eof");
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79 file_size = ftell (fid);
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80 fseek (fid, 0, "bof");
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81
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82 ## Find RIFF chunk.
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83 riff_size = find_chunk (fid, "RIFF", file_size);
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84 riff_pos = ftell (fid);
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85 if (riff_size == -1)
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86 error ("wavread: file contains no RIFF chunk");
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87 endif
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88 riff_size = min (riff_size, file_size - riff_pos);
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89
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90 riff_type = char (fread (fid, 4))';
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91 if (! strcmp (riff_type, "WAVE"))
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92 error ("wavread: file contains no WAVE signature");
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93 endif
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94 riff_pos = riff_pos + 4;
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95 riff_size = riff_size - 4;
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96
13003
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97 ## Find format chunk inside the RIFF chunk.
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98 fseek (fid, riff_pos, "bof");
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99 fmt_size = find_chunk (fid, "fmt ", riff_size);
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diff changeset
100 fmt_pos = ftell (fid);
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101 if (fmt_size == -1)
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102 error ("wavread: file contains no format chunk");
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103 endif
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104
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105 ## Find data chunk inside the RIFF chunk.
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106 ## We don't assume that it comes after the format chunk.
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107 fseek (fid, riff_pos, "bof");
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108 data_size = find_chunk (fid, "data", riff_size);
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109 data_pos = ftell (fid);
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110 if (data_size == -1)
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111 error ("wavread: file contains no data chunk");
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diff changeset
112 endif
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113 data_size = min (data_size, file_size - data_pos);
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114
13003
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115 ### Read format chunk.
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116 fseek (fid, fmt_pos, "bof");
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117
13003
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118 ## Sample format code.
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119 format_tag = fread (fid, 1, "uint16", 0, BYTEORDER);
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120 if (format_tag != FORMAT_PCM && format_tag != FORMAT_IEEE_FLOAT)
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121 error ("wavread: sample format %#x is not supported", format_tag);
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122 endif
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123
13003
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124 ## Number of interleaved channels.
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125 channels = fread (fid, 1, "uint16", 0, BYTEORDER);
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126
13003
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127 ## Sample rate.
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128 samples_per_sec = fread (fid, 1, "uint32", 0, BYTEORDER);
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129
13003
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130 ## Bits per sample.
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131 fseek (fid, 6, "cof");
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132 bits_per_sample = fread (fid, 1, "uint16", 0, BYTEORDER);
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133
13003
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134 ### Read data chunk.
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135 fseek (fid, data_pos, "bof");
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136
13003
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137 ## Determine sample data type.
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138 if (format_tag == FORMAT_PCM)
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diff changeset
139 switch (bits_per_sample)
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diff changeset
140 case 8
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diff changeset
141 format = "uint8";
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diff changeset
142 case 16
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diff changeset
143 format = "int16";
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diff changeset
144 case 24
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diff changeset
145 format = "uint8";
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diff changeset
146 case 32
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diff changeset
147 format = "int32";
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diff changeset
148 otherwise
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diff changeset
149 error ("wavread: %d bits sample resolution is not supported with PCM",
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diff changeset
150 bits_per_sample);
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diff changeset
151 endswitch
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diff changeset
152 else
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diff changeset
153 switch (bits_per_sample)
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154 case 32
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155 format = "float32";
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diff changeset
156 case 64
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157 format = "float64";
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diff changeset
158 otherwise
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diff changeset
159 error ("wavread: %d bits sample resolution is not supported with IEEE float",
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diff changeset
160 bits_per_sample);
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diff changeset
161 endswitch
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diff changeset
162 endif
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163
13003
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diff changeset
164 ## Parse arguments.
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parents: 13001
diff changeset
165 if (nargin == 1)
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
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parents: 13001
diff changeset
166 length = idivide (8 * data_size, bits_per_sample);
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parents: 13001
diff changeset
167 else
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John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
168 nparams = numel (param);
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John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
169 if (nparams == 1)
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
170 ## Number of samples is given.
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parents: 13001
diff changeset
171 length = param * channels;
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John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
172 elseif (nparams == 2)
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
173 ## Sample range is given.
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parents: 13001
diff changeset
174 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
175 warning ("wavread: seeking failed");
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
176 endif
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
177 length = (param(2)-param(1)+1) * channels;
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parents: 13001
diff changeset
178 elseif (nparams == 4 && char (param) == "size")
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
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parents: 13001
diff changeset
179 ## Size of the file is requested.
17193
af2051e363ea Fix return arguments for wavread (...,"size"), bug #39639.
Rik <rik@octave.org>
parents: 16491
diff changeset
180 y = idivide (8 * data_size, channels * bits_per_sample);
af2051e363ea Fix return arguments for wavread (...,"size"), bug #39639.
Rik <rik@octave.org>
parents: 16491
diff changeset
181 samples_per_sec = channels;
13003
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
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parents: 13001
diff changeset
182 return;
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John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
183 else
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
184 error ("wavread: invalid PARAM argument");
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
185 endif
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
186 endif
11587
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parents: 11563
diff changeset
187
13003
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parents: 13001
diff changeset
188 ## Read samples and close file.
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parents: 13001
diff changeset
189 if (bits_per_sample == 24)
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John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
190 length *= 3;
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John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
191 endif
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parents: 13001
diff changeset
192
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
193 [yi, n] = fread (fid, length, format, 0, BYTEORDER);
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parents: 13001
diff changeset
194
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
John W. Eaton <jwe@octave.org>
parents: 13001
diff changeset
195 unwind_protect_cleanup
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parents: 13001
diff changeset
196
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
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parents: 13001
diff changeset
197 if (fid >= 0)
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198 fclose (fid);
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jwe
parents:
diff changeset
199 endif
5839
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
200
13003
74c5fa5cef47 use unwind_protect to ensure wavread closes file.
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parents: 13001
diff changeset
201 end_unwind_protect
5839
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
202
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parents: 7461
diff changeset
203 ## Check data.
6304
78a3254741b2 [project @ 2007-02-14 21:22:59 by jwe]
jwe
parents: 6046
diff changeset
204 if (mod (numel (yi), channels) != 0)
78a3254741b2 [project @ 2007-02-14 21:22:59 by jwe]
jwe
parents: 6046
diff changeset
205 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
206 filename);
6304
78a3254741b2 [project @ 2007-02-14 21:22:59 by jwe]
jwe
parents: 6046
diff changeset
207 endif
78a3254741b2 [project @ 2007-02-14 21:22:59 by jwe]
jwe
parents: 6046
diff changeset
208
5839
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
209 if (bits_per_sample == 24)
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parents: 14363
diff changeset
210 yi = reshape (yi, 3, rows (yi) / 3)';
5839
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
211 yi(yi(:,3) >= 128, 3) -= 256;
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
212 yi = yi * [1; 256; 65536];
7151
aeeb646f6538 [project @ 2007-11-09 19:34:17 by jwe]
jwe
parents: 7117
diff changeset
213 endif
aeeb646f6538 [project @ 2007-11-09 19:34:17 by jwe]
jwe
parents: 7117
diff changeset
214
5567
80e629357483 [project @ 2005-12-07 06:31:28 by jwe]
jwe
parents: 5566
diff changeset
215 if (format_tag == FORMAT_PCM)
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diff changeset
216 ## Normalize samples.
5567
80e629357483 [project @ 2005-12-07 06:31:28 by jwe]
jwe
parents: 5566
diff changeset
217 switch (bits_per_sample)
5565
2eeed655e801 [project @ 2005-12-06 20:38:20 by jwe]
jwe
parents:
diff changeset
218 case 8
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Rik <octave@nomad.inbox5.com>
parents: 11587
diff changeset
219 yi = (yi - 128)/128;
5572
c45cf76df06f [project @ 2005-12-12 20:54:06 by jwe]
jwe
parents: 5567
diff changeset
220 case 16
12701
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Rik <octave@nomad.inbox5.com>
parents: 11587
diff changeset
221 yi /= 32768;
5839
0bc78d9ddcd4 [project @ 2006-06-01 21:21:11 by jwe]
jwe
parents: 5642
diff changeset
222 case 24
12701
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Rik <octave@nomad.inbox5.com>
parents: 11587
diff changeset
223 yi /= 8388608;
5572
c45cf76df06f [project @ 2005-12-12 20:54:06 by jwe]
jwe
parents: 5567
diff changeset
224 case 32
12701
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Rik <octave@nomad.inbox5.com>
parents: 11587
diff changeset
225 yi /= 2147483648;
5565
2eeed655e801 [project @ 2005-12-06 20:38:20 by jwe]
jwe
parents:
diff changeset
226 endswitch
2eeed655e801 [project @ 2005-12-06 20:38:20 by jwe]
jwe
parents:
diff changeset
227 endif
11587
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parents: 11563
diff changeset
228
8506
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parents: 7461
diff changeset
229 ## Deinterleave.
5567
80e629357483 [project @ 2005-12-07 06:31:28 by jwe]
jwe
parents: 5566
diff changeset
230 nr = numel (yi) / channels;
80e629357483 [project @ 2005-12-07 06:31:28 by jwe]
jwe
parents: 5566
diff changeset
231 y = reshape (yi, channels, nr)';
11587
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John W. Eaton <jwe@octave.org>
parents: 11563
diff changeset
232
5565
2eeed655e801 [project @ 2005-12-06 20:38:20 by jwe]
jwe
parents:
diff changeset
233 endfunction
8796
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Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
234
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
235 ## Given a chunk_id, scan through chunks from the current file position
9662dfb26652 wavread.m: improve search for data chunks
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parents: 8506
diff changeset
236 ## 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
237 ## 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
238 ## size if chunk is not found.
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Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
239
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
240 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
241 id = "";
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
242 offset = 8;
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
243 chunk_size = 0;
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
244
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
245 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
246 fseek (fid, chunk_size, "cof");
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
247 id = char (fread (fid, 4))';
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
248 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
249 ## 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
250 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
251 offset = offset + 8 + chunk_size;
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
252 endwhile
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
253 if (! strcmp (id, chunk_id))
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
254 chunk_size = -1;
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
255 endif
9662dfb26652 wavread.m: improve search for data chunks
Frederick Umminger <Frederick_Umminger@playstation.sony.com>
parents: 8506
diff changeset
256 endfunction
12701
de3e90a420e3 Overhaul wavwrite, wavread and fix normalization problem (Bug #33420).
Rik <octave@nomad.inbox5.com>
parents: 11587
diff changeset
257
14363
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks
Rik <octave@nomad.inbox5.com>
parents: 14138
diff changeset
258
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks
Rik <octave@nomad.inbox5.com>
parents: 14138
diff changeset
259 ## Mark file as tested. Tests for wavread/wavwrite pair are in wavwrite.m.
14868
5d3a684236b0 maint: Use Octave coding conventions for cuddling parentheses in scripts directory
Rik <octave@nomad.inbox5.com>
parents: 14363
diff changeset
260 %!assert (1)
14363
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks
Rik <octave@nomad.inbox5.com>
parents: 14138
diff changeset
261