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src/io/source_sndfile.c: pad with 0 when end of file is reached

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

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

@@ -171,6 +171,13 @@

 #endif /* HAVE_SAMPLERATE */

   *read = (int)FLOOR(s->ratio * read_samples / input_channels + .5);

+

+  if (*read < s->hop_size) {

+    for (j = *read; j < s->hop_size; j++) {

+      data[j] = 0;

+    }

+  }

+

 }

 void aubio_source_sndfile_do_multi(aubio_source_sndfile_t * s, fmat_t * read_data, uint_t * read){

@@ -205,6 +212,15 @@

 #endif /* HAVE_SAMPLERATE */

   *read = (int)FLOOR(s->ratio * read_samples / input_channels + .5);

+

+  if (*read < s->hop_size) {

+    for (i = 0; i < input_channels; i++) {

+      for (j = *read; j < s->hop_size; j++) {

+        data[i][j] = 0.;

+      }

+    }

+  }

+

 }

 uint_t aubio_source_sndfile_get_samplerate(aubio_source_sndfile_t * s) {