Index: libmpcodecs/ad_hwac3.c
===================================================================
--- libmpcodecs/ad_hwac3.c	(revision 24443)
+++ libmpcodecs/ad_hwac3.c	(working copy)
@@ -168,7 +168,8 @@
     buf[6] = (len << 3) & 0xFF;
     buf[7] = (len >> 5) & 0xFF;
 #ifdef WORDS_BIGENDIAN
-    memcpy(buf + 8, sh_audio->a_in_buffer, len);  // untested
+    swab(buf, buf, 8);
+    memcpy(buf + 8, sh_audio->a_in_buffer, len);
 #else
     swab(sh_audio->a_in_buffer, buf + 8, len);
 #endif
@@ -362,7 +363,8 @@
     mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: more data than fits\n");
   }
 #ifdef WORDS_BIGENDIAN
-  memcpy(&buf[8], indata_ptr, fsize);  // untested
+  swab(buf, buf, 8);
+  memcpy(&buf[8], indata_ptr, fsize);
 #else
   //TODO if fzise is odd, swab doesn't copy the last byte
   swab(indata_ptr, &buf[8], fsize);