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annotate libinterp/dldfcn/audioread.cc @ 19535:1f551d169db2

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Include config.h in audio project source files * libinterp/dldfcn/__player_audioplayer__.cc, libinterp/dldfcn/__recorder_audiorecorder__.cc, libinterp/dldfcn/audiodevinfo.cc, libinterp/dldfcn/audioinfo.cc, libinterp/dldfcn/audioread.cc, libinterp/dldfcn/audiowrite.cc, libinterp/dldfcn/player_class.cc, libinterp/dldfcn/recorder_class.cc: Include config.h before all other header files.
author Mike Miller <mtmiller@ieee.org>
date Tue, 01 Oct 2013 23:42:43 -0400
parents 8bb399569393
children 36a26a131209
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19534
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1 /*
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2
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3 Copyright (C) 2013 Vytautas Jančauskas
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include "oct.h"
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28 #include "ov-struct.h"
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29 #ifdef HAVE_SNDFILE
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30 #include <sndfile.h>
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31 #endif
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32
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33 DEFUN_DLD(audioread, args, ,
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34 "-*- texinfo -*-\n\
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35 @deftypefn{Loadable Function} [@var{y}, @var{Fs}] = audioread(@var{filename})\n\
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36 \n\
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37 Load an audio file that is specified by @var{filename}. It will be loaded in to \
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38 a column matrix with as many rows as there are audio frames and as many columns \
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39 as there are channels in the file. Sampling rate will be stored in @var{Fs}. \
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40 \n\
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41 @end deftypefn\n\
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42 @deftypefn{Loadable Function} [@var{y}, @var{Fs}] = audioread(@var{filename}, @var{samples})\n\
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43 \n\
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44 Read a specified range of samples from a file specified by @var{filename}. \
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45 Argument @var{samples} is a vector with two values specifying starting frame \
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46 and ending frame. \
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47 \n\
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48 @end deftypefn\n\
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49 @deftypefn{Loadable Function} [@var{y}, @var{Fs}] = audioread(@var{filename}, @var{dataType})\n\
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50 \n\
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51 Read a file and return an array of specified type. If @var{dataType} is \"native\" then \
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52 an array of fixed width integer type will be returned depending on how data is stored \
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53 in the audio file. If @var{dataType} is \"double\" a double matrix will be returned. \
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54 \n\
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55 @end deftypefn\n\
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56 @deftypefn{Loadable Function} [@var{y}, @var{Fs}] = audioread(@var{filename}, @var{samples}, @var{dataType})\n\
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57 \n\
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58 Read a file and return a specified range of frames in an array of specified type. \
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59 \n\
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60 @end deftypefn"
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61 )
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62 {
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63 octave_value_list retval;
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64 #ifdef HAVE_SNDFILE
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65 Matrix audio;
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66 octave_value ret_audio;
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67 SNDFILE *file;
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68 SF_INFO info;
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69 info.format = 0;
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70 int start, end;
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71 file = sf_open(args(0).string_value ().c_str (), SFM_READ, &info);
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72 start = 0;
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73 end = info.frames;
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74 float *data = (float *)malloc (sizeof(float) * info.frames * info.channels);
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75 sf_read_float(file, data, info.frames * info.channels);
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76 if (args.length () == 2 && !args(1).is_string () || args.length () == 3)
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77 {
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78 RowVector range = args(1).row_vector_value ();
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79 start = range(0);
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80 end = range(1);
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81 }
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82 audio.resize (end - start, info.channels);
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83 for (int i = start; i < end; i++)
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84 {
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85 for (int channel = 0; channel < info.channels; channel++)
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86 {
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87 audio(i - start, channel) = data[i * info.channels + channel];
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88 }
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89 }
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90 free (data);
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91 if (args.length () == 2 && args(1).is_string () || args.length () == 3)
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92 {
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93 std::string type;
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94 if (args.length () == 3)
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95 {
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96 type = args(2).string_value ();
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97 }
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98 else
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99 {
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100 type = args(1).string_value ();
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101 }
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102 if (type == "native")
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103 {
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104 if (info.format & SF_FORMAT_PCM_S8)
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105 {
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106 ret_audio = octave_value ((audio * 127)).int8_array_value ();
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107 }
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108 else if (info.format & SF_FORMAT_PCM_U8)
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109 {
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110 ret_audio = octave_value ((audio * 127 + 127)).uint8_array_value ();
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111 }
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112 else if (info.format & SF_FORMAT_PCM_16)
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113 {
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114 ret_audio = octave_value ((audio * 32767)).int16_array_value ();
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115 }
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116 else if (info.format & SF_FORMAT_PCM_24)
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117 {
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118 ret_audio = octave_value ((audio * 8388608)).int32_array_value ();
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119 }
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120 else if (info.format & SF_FORMAT_PCM_32)
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121 {
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122 ret_audio = octave_value ((audio * 2147483648)).int32_array_value ();
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123 }
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124 else
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125 {
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126 ret_audio = octave_value (audio);
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127 }
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128 }
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129 else
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130 {
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131 ret_audio = octave_value (audio);
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132 }
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133 }
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134 else
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135 {
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136 ret_audio = octave_value (audio);
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137 }
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138 retval(0) = ret_audio;
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139 retval(1) = info.samplerate;
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140 #else
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141 error("sndfile not found on your system and thus audioread is not functional");
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142 #endif
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143 return octave_value(retval);
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144 }