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src/io/source_apple_audio.c: reset mDataByteSize in case of short read

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

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

@@ -237,6 +237,13 @@

 }

 uint_t aubio_source_apple_audio_seek (aubio_source_apple_audio_t * s, uint_t pos) {

+  if (1) {

+    AudioBufferList *bufferList = &s->bufferList;

+    UInt32 samples = s->block_size * s->channels;

+    Float64 rateRatio = s->samplerate / s->source_samplerate;

+    uint_t segmentSize= (uint_t)(samples * rateRatio + .5);

+    bufferList->mBuffers[0].mDataByteSize = segmentSize * sizeof(short);

+  }

   SInt64 resampled_pos = (SInt64)ROUND( pos * s->source_samplerate * 1. / s->samplerate );

   OSStatus err = ExtAudioFileSeek(s->audioFile, resampled_pos);

   if (err) AUBIO_ERROR("source_apple_audio: error in ExtAudioFileSeek (%d)\n", (int)err);