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src/io/source_sndfile.c: refuse to run when when resampled hop_size does not match the requested one

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

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

@@ -105,7 +105,12 @@

   if (s->ratio != 1) {

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

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

-    if (s-> ratio > 1) {

+    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 ) {

+        AUBIO_ERR("can not upsample from %d to %d\n", s->input_samplerate, s->samplerate);

+        goto beach;

+      }

       AUBIO_WRN("upsampling %s from %d to % d\n", s->path, s->input_samplerate, s->samplerate);

     }

   }

@@ -123,7 +128,7 @@

   return s;

 beach:

-  AUBIO_ERR("can not read %s at samplerate %dHz with hop_size of %d\n",

+  AUBIO_ERR("can not read %s at samplerate %dHz with a hop_size of %d\n",

       s->path, s->samplerate, s->hop_size);

   del_aubio_source_sndfile(s);

   return NULL;