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[io] source_pad_do_output to pad extra channels

--- a/src/io/ioutils.c

+++ b/src/io/ioutils.c

@@ -111,6 +111,15 @@

           read_data->length - source_read);

     }

   }

+

+  // destination matrix has more channels than the file

+  // copy channels from the source to extra output channels

+  if (read_data->height > source_channels) {

+    for (i = source_channels; i < read_data->height; i++) {

+      AUBIO_MEMCPY(read_data->data[i], read_data->data[i % source_channels],

+          sizeof(smpl_t) * read_data->length);

+    }

+  }

 }

 uint_t