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src/io/source_sndfile.c: automagically set samplerate to input file if 0 is requested

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

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

@@ -69,7 +69,6 @@

   }

   s->hop_size = hop_size;

-  s->samplerate = samplerate;

   s->channels = 1;

   s->path = path;

@@ -89,6 +88,11 @@

   s->input_channels   = sfinfo.channels;

   s->input_format     = sfinfo.format;

+  if (samplerate == 0) {

+    samplerate = s->input_samplerate;

+    AUBIO_WRN("sampling rate set to 0, automagically adjusting to %d", samplerate);

+  }

+  s->samplerate = samplerate;

   /* compute input block size required before resampling */

   s->ratio = s->samplerate/(float)s->input_samplerate;

   s->input_hop_size = (uint_t)FLOOR(s->hop_size / s->ratio + .5);