* 3x encoding speedup. Finally we seem to be on par with libdv

     in terms of time and we're doing slightly better w.r.t. to
     quality. I don't think there's much room for improvement
     left, but I'd like to try and vectorize a couple of things.
     Btw, any ideas on what may impact performance will be greatly
     appreciated.

Originally committed as revision 2532 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dvdata.h

@@ -51,6 +51,11 @@ typedef struct DVprofile {
 
 #define NB_DV_VLC 409
 
+/* 
+ * There's a catch about the following three tables: the mapping they establish
+ * between (run, level) and vlc is not 1-1. So you have to watch out for that
+ * when building misc. tables. E.g. (1, 0) can be either 0x7cf or 0x1f82. 
+ */
 static const uint16_t dv_vlc_bits[409] = {
  0x0000, 0x0002, 0x0007, 0x0008, 0x0009, 0x0014, 0x0015, 0x0016,
  0x0017, 0x0030, 0x0031, 0x0032, 0x0033, 0x0068, 0x0069, 0x006a,