Update to opus-HEAD-66611f1.

include/opus.h

 /* Copyright (c) 2010-2011 Xiph.Org Foundation, Skype Limited
    Written by Jean-Marc Valin and Koen Vos */
 /*
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
 
    - Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 
@@ skipping 598 matching lines @@
 /**@}*/
 
 /** @defgroup opus_repacketizer Repacketizer
   * @{
   *
   * The repacketizer can be used to merge multiple Opus packets into a single
   * packet or alternatively to split Opus packets that have previously been
   * merged. Splitting valid Opus packets is always guaranteed to succeed,
   * whereas merging valid packets only succeeds if all frames have the same
   * mode, bandwidth, and frame size, and when the total duration of the merged
-  * packet is no more than 120 ms.
+  * packet is no more than 120 ms. The 120 ms limit comes from the
+  * specification and limits decoder memory requirements at a point where
+  * framing overhead becomes negligible.
+  *
   * The repacketizer currently only operates on elementary Opus
   * streams. It will not manipualte multistream packets successfully, except in
   * the degenerate case where they consist of data from a single stream.
   *
   * The repacketizing process starts with creating a repacketizer state, either
   * by calling opus_repacketizer_create() or by allocating the memory yourself,
   * e.g.,
   * @code
   * OpusRepacketizer *rp;
   * rp = (OpusRepacketizer*)malloc(opus_repacketizer_get_size());
@@ skipping 339 matching lines @@
   */
 OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_multistream_packet_unpad(unsigned char *data, opus_int32 len, int nb_streams);
 
 /**@}*/
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif /* OPUS_H */