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src/io/source_apple_audio.c: copy data to missing channels

--- a/src/io/source_apple_audio.c

+++ b/src/io/source_apple_audio.c

@@ -204,10 +204,19 @@

       buf[c][v] = SHORT_TO_FLOAT(data[ v * s->channels + c]);

     }

   }

+  // if read_data has more channels than the file

+  if (read_to->height > s->channels) {

+    // copy last channel to all additional channels

+    for (v = 0; v < loadedPackets; v++) {

+      for (c = s->channels; c < read_to->height; c++) {

+        buf[c][v] = SHORT_TO_FLOAT(data[ v * s->channels + (s->channels - 1)]);

+      }

+    }

+  }

   // short read, fill with zeros

   if (loadedPackets < s->block_size) {

     for (v = loadedPackets; v < s->block_size; v++) {

-      for (c = 0; c < s->channels; c++) {

+      for (c = 0; c < read_to->height; c++) {

         buf[c][v] = 0.;

       }

     }