Mercurial > octave-nkf
annotate libinterp/dldfcn/audioread.cc @ 19525:93f26237c30b
fix some missing semicolons and add some conditional compilation constructs to audio functions
* audioinfo.cc, audioread.cc, audiowrite.cc: fix a missing semicolon
* audiowrite.cc: prevent building the extension to format table if sndfile
is not present
author | Vytautas Jančauskas <unaudio@gmail.com> |
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date | Thu, 19 Sep 2013 15:18:25 +0300 |
parents | 2e174b5e7703 |
children | 0ac6a4e7369b |
rev | line source |
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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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0243b86b3cee
Added libsndfile based audio file utilities to the source tree
Vytautas Jančauskas <unaudio@gmail.com>
parents:
diff
changeset
|
114 return octave_value(retval); |
0243b86b3cee
Added libsndfile based audio file utilities to the source tree
Vytautas Jančauskas <unaudio@gmail.com>
parents:
diff
changeset
|
115 } |