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src/io/source_sndfile.c: use linear resampling to make sure all output samples are created on first read

--- a/src/io/source_sndfile.c

+++ b/src/io/source_sndfile.c

@@ -104,7 +104,7 @@

   s->input_data = NULL;

   if (s->ratio != 1) {

     s->input_data = new_fvec(s->input_hop_size);

-    s->resampler = new_aubio_resampler(s->ratio, 0);

+    s->resampler = new_aubio_resampler(s->ratio, 4);

     if (s->ratio > 1) {

       // we would need to add a ring buffer for these

       if ( (uint_t)(s->input_hop_size * s->ratio + .5)  != s->hop_size ) {