Fix valgrind and asan memory leaks and crashes.

libavformat/oggdec.h

 /**
     Copyright (C) 2005  Michael Ahlberg, Måns Rullgård
 
     Permission is hereby granted, free of charge, to any person
     obtaining a copy of this software and associated documentation
     files (the "Software"), to deal in the Software without
     restriction, including without limitation the rights to use, copy,
     modify, merge, publish, distribute, sublicense, and/or sell copies
     of the Software, and to permit persons to whom the Software is
     furnished to do so, subject to the following conditions:
@@ skipping 77 matching lines @@
 };
 
 struct ogg {
     struct ogg_stream *streams;
     int nstreams;
     int headers;
     int curidx;
     struct ogg_state *state;
 };
 
+struct oggvorbis_private {
+    unsigned int len[3];
+    unsigned char *packet[3];
+};
+
 #define OGG_FLAG_CONT 1
 #define OGG_FLAG_BOS  2
 #define OGG_FLAG_EOS  4
 
 extern const struct ogg_codec ff_celt_codec;
 extern const struct ogg_codec ff_dirac_codec;
 extern const struct ogg_codec ff_flac_codec;
 extern const struct ogg_codec ff_ogm_audio_codec;
 extern const struct ogg_codec ff_ogm_old_codec;
 extern const struct ogg_codec ff_ogm_text_codec;
@@ skipping 31 matching lines @@
     } else {
         pts = gp;
         if (dts)
             *dts = pts;
     }
 
     return pts;
 }
 
 #endif /* AVFORMAT_OGGDEC_H */