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| author | Roman Shaposhnik <roman@shaposhnik.org> | 2003-11-27 01:40:13 +0000 |
|---|---|---|
| committer | Roman Shaposhnik <roman@shaposhnik.org> | 2003-11-27 01:40:13 +0000 |
| commit | e15c330246b695e940f9b1404e9926e0d18a68d6 (patch) | |
| tree | 4298272e41709ff38c83def3db5b0c07e8379704 /libavcodec/dvdata.h | |
| parent | e1c2a5a0a8e9f8a4e68a33f31d4a917771bbc1bb (diff) | |
* 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
Diffstat (limited to 'libavcodec/dvdata.h')
| -rw-r--r-- | libavcodec/dvdata.h | 5 |
1 files changed, 5 insertions, 0 deletions
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, |