From e15c330246b695e940f9b1404e9926e0d18a68d6 Mon Sep 17 00:00:00 2001 From: Roman Shaposhnik Date: Thu, 27 Nov 2003 01:40:13 +0000 Subject: * 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 | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'libavcodec/dvdata.h') diff --git a/libavcodec/dvdata.h b/libavcodec/dvdata.h index 57a7e20281..e6e0986ba5 100644 --- a/libavcodec/dvdata.h +++ b/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, -- cgit v1.2.3