Mercurial > octave-nkf

annotate libinterp/dldfcn/audioread.cc @ 19507:2e174b5e7703

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Fix audiodevinfo, audioinfo, audioread and audiowrite build process * audiodevinfo.cc: added bits_to_format utility function * audioinfo.cc, audioread.cc, audiowrite.cc: make sure to not attempt to include sndfile.h if it is not present
author Vytautas Jančauskas <unaudio@gmail.com>
date Wed, 11 Sep 2013 22:05:47 +0300
parents 9161b7653392
children 93f26237c30b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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157eeaa53277 Fix includes in audioread, audiowrite and audioinfo
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1 #include "oct.h"
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2 #include "ov-struct.h"
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3 #ifdef HAVE_SNDFILE
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4 #include <sndfile.h>
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5 #endif
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6
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7 DEFUN_DLD(audioread, args, ,
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8 "-*- texinfo -*-\n\
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9 @deftypefn{Loadable Function} [@var{y}, @var{Fs}] = audioread(@var{filename})\n\
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10 \n\
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11 Load an audio file that is specified by @var{filename}. It will be loaded in to \
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12 a column matrix with as many rows as there are audio frames and as many columns \
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13 as there are channels in the file. Sampling rate will be stored in @var{Fs}. \
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14 \n\
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15 @deftypefnx{Loadable Function} [@var{y}, @var{Fs}] = audioread(@var{filename}, @var{samples})\n\
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16 \n\
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17 Read a specified range of samples from a file specified by @var{filename}. \
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18 Argument @var{samples} is a vector with two values specifying starting frame \
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19 and ending frame. \
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20 \n\
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21 @deftypefnx{Loadable Function} [@var{y}, @var{Fs}] = audioread(@var{filename}, @var{dataType})\n\
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22 \n\
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23 Read a file and return an array of specified type. If @var{dataType} is \"native\" then \
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24 an array of fixed width integer type will be returned depending on how data is stored \
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25 in the audio file. If @var{dataType} is \"double\" a double matrix will be returned. \
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26 \n\
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27 @deftypefnx{Loadable Function} [@var{y}, @var{Fs}] = audioread(@var{filename}, @var{samples}, @var{dataType})\n\
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28 \n\
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29 Read a file and return a specified range of frames in an array of specified type. \
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30 \n\
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31 @end deftypefn"
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32 )
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33 {
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34 octave_value_list retval;
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35 #ifdef HAVE_SNDFILE
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36 Matrix audio;
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37 octave_value ret_audio;
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38 SNDFILE *file;
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39 SF_INFO info;
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40 info.format = 0;
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41 int start, end;
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42 file = sf_open(args(0).string_value ().c_str (), SFM_READ, &info);
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43 start = 0;
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44 end = info.frames;
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45 float *data = (float *)malloc (sizeof(float) * info.frames * info.channels);
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46 sf_read_float(file, data, info.frames * info.channels);
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47 if (args.length () == 2 && !args(1).is_string () || args.length () == 3)
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48 {
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49 RowVector range = args(1).row_vector_value ();
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50 start = range(0);
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51 end = range(1);
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52 }
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53 audio.resize (end - start, info.channels);
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54 for (int i = start; i < end; i++)
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55 {
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56 for (int channel = 0; channel < info.channels; channel++)
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57 {
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58 audio(i - start, channel) = data[i * info.channels + channel];
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59 }
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60 }
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61 free (data);
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62 if (args.length () == 2 && args(1).is_string () || args.length () == 3)
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63 {
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64 std::string type;
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65 if (args.length () == 3)
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66 {
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67 type = args(2).string_value ();
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68 }
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69 else
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70 {
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71 type = args(1).string_value ();
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72 }
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73 if (type == "native")
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74 {
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75 if (info.format & SF_FORMAT_PCM_S8)
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76 {
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77 ret_audio = octave_value ((audio * 127)).int8_array_value ();
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78 }
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79 else if (info.format & SF_FORMAT_PCM_U8)
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80 {
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81 ret_audio = octave_value ((audio * 127 + 127)).uint8_array_value ();
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82 }
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83 else if (info.format & SF_FORMAT_PCM_16)
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84 {
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85 ret_audio = octave_value ((audio * 32767)).int16_array_value ();
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86 }
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87 else if (info.format & SF_FORMAT_PCM_24)
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88 {
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89 ret_audio = octave_value ((audio * 8388608)).int32_array_value ();
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90 }
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91 else if (info.format & SF_FORMAT_PCM_32)
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92 {
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93 ret_audio = octave_value ((audio * 2147483648)).int32_array_value ();
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94 }
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95 else
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96 {
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97 ret_audio = octave_value (audio);
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98 }
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99 }
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100 else
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101 {
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102 ret_audio = octave_value (audio);
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103 }
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104 }
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105 else
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106 {
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107 ret_audio = octave_value (audio);
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108 }
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109 retval(0) = ret_audio;
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110 retval(1) = info.samplerate;
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111 #else
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112 error("sndfile not found on your system and thus audioread is not functional")
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113 #endif
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114 return octave_value(retval);
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115 }