add init_vlc_sparse(). faster than init_vlc() if there are lots of holes in the tables.

Originally committed as revision 9117 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 11 insertions, 1 deletions

diff --git a/libavcodec/bitstream.h b/libavcodec/bitstream.h
index 2ef76ec5d7..e30ba83510 100644
--- a/libavcodec/bitstream.h
+++ b/libavcodec/bitstream.h
@@ -799,9 +799,19 @@ static inline void align_get_bits(GetBitContext *s)
     if(n) skip_bits(s, n);
 }
 
-int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
+#define init_vlc(vlc, nb_bits, nb_codes,\
+                 bits, bits_wrap, bits_size,\
+                 codes, codes_wrap, codes_size,\
+                 flags)\
+        init_vlc_sparse(vlc, nb_bits, nb_codes,\
+                 bits, bits_wrap, bits_size,\
+                 codes, codes_wrap, codes_size,\
+                 NULL, 0, 0, flags)
+
+int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
              const void *bits, int bits_wrap, int bits_size,
              const void *codes, int codes_wrap, int codes_size,
+             const void *symbols, int symbols_wrap, int symbols_size,
              int flags);
 #define INIT_VLC_USE_STATIC 1
 #define INIT_VLC_LE         2