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src/io/source_apple_audio.h: add _get_duration

--- a/src/io/source_apple_audio.c

+++ b/src/io/source_apple_audio.c

@@ -311,10 +311,7 @@

     goto beach;

   }

   // check if we are not seeking out of the file

-  SInt64 fileLengthFrames = 0;

-  UInt32 propSize = sizeof(fileLengthFrames);

-  ExtAudioFileGetProperty(s->audioFile,

-      kExtAudioFileProperty_FileLengthFrames, &propSize, &fileLengthFrames);

+  uint_t fileLengthFrames = aubio_source_apple_audio_get_duration(s);

   // compute position in the source file, before resampling

   smpl_t ratio = s->source_samplerate * 1. / s->samplerate;

   SInt64 resampled_pos = (SInt64)ROUND( pos * ratio );

@@ -361,6 +358,21 @@

 uint_t aubio_source_apple_audio_get_channels(const aubio_source_apple_audio_t * s) {

   return s->channels;

+}

+

+uint_t aubio_source_apple_audio_get_duration(const aubio_source_apple_audio_t * s) {

+  SInt64 fileLengthFrames = 0;

+  UInt32 propSize = sizeof(fileLengthFrames);

+  OSStatus err = ExtAudioFileGetProperty(s->audioFile,

+      kExtAudioFileProperty_FileLengthFrames, &propSize, &fileLengthFrames);

+  if (err) {

+    char_t errorstr[20];

+    AUBIO_ERROR("source_apple_audio: Failed getting %s duration, "

+        "error in ExtAudioFileGetProperty (%s)\n", s->path,

+        getPrintableOSStatusError(errorstr, err));

+    return err;

+  }

+  return (uint_t)fileLengthFrames;

 }

 #endif /* HAVE_SOURCE_APPLE_AUDIO */

--- a/src/io/source_apple_audio.h

+++ b/src/io/source_apple_audio.h

@@ -109,6 +109,16 @@

 /**

+  get the duration of source object, in frames

+

+  \param s source object, created with ::new_aubio_source_apple_audio

+  \return number of frames in file

+

+*/

+uint_t aubio_source_apple_audio_get_duration(const aubio_source_apple_audio_t * s);

+

+/**

+

   seek source object

   \param s source object, created with ::new_aubio_source