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annotate libinterp/dldfcn/audioinfo.cc @ 19496:0243b86b3cee

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Added libsndfile based audio file utilities to the source tree * audioinfo.cc, audioread.cc, audiowrite.cc: new files * module-files: appended with lines to build new files
author Vytautas Jančauskas <unaudio@gmail.com>
date Tue, 10 Sep 2013 11:50:55 +0300
parents
children 157eeaa53277
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
19496
0243b86b3cee Added libsndfile based audio file utilities to the source tree
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1 #include <octave/oct.h>
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2 #include <octave/ov-struct.h>
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3 #include <sndfile.h>
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4
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5 DEFUN_DLD(audioinfo, args, ,
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6 "-*- texinfo -*-\n\
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7 @deftypefn{Loadable Function} info = audioinfo(@var{filename})\n\
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8 \n\
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9 Return information about an audio file specified by @var{filename}.\
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10 \n\
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11 @end deftypefn"
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12 )
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13 {
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14 octave_scalar_map retval;
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15 Matrix audio;
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16 SNDFILE *file;
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17 SF_INFO info;
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18 info.format = 0;
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19 int start, end;
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20 file = sf_open(args(0).string_value ().c_str (), SFM_READ, &info);
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21 retval.assign ("Filename", args(0).string_value ());
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22 retval.assign ("CompressionMethod", "");
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23 retval.assign ("NumChannels", info.channels);
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24 retval.assign ("SampleRate", info.samplerate);
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25 retval.assign ("TotalSamples", info.frames);
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26 retval.assign ("Duration", (float)info.frames / (float)info.samplerate);
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27 int bits;
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28 if (info.format & SF_FORMAT_PCM_S8)
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29 {
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30 bits = 8;
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31 }
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32 else if (info.format & SF_FORMAT_PCM_U8)
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33 {
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34 bits = 8;
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35 }
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36 else if (info.format & SF_FORMAT_PCM_16)
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37 {
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38 bits = 16;
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39 }
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40 else if (info.format & SF_FORMAT_PCM_24)
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41 {
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42 bits = 24;
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43 }
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44 else if (info.format & SF_FORMAT_PCM_32)
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45 {
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46 bits = 32;
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47 }
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48 else
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49 {
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50 bits = -1;
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51 }
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52 retval.assign ("BitsPerSample", bits);
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53 retval.assign ("BitRate", -1);
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54 retval.assign ("Title", sf_get_string (file, SF_STR_TITLE));
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55 retval.assign ("Artist", sf_get_string (file, SF_STR_ARTIST));
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56 retval.assign ("Comment", sf_get_string (file, SF_STR_COMMENT));
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57 return octave_value(retval);
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58 }