[FFmpeg-devel] [PATCH] DVCPRO HD [1/3] dynamic DV macroblock lookup
Thu Jan 3 14:07:46 CET 2008
This is a series of 3 incremental patches that add DVCPRO HD support to
Patch 1 of 3 removes the look-up tables used by the DV codec to
determine macroblock locations, and replaces them with functions that
computes the macroblock locations at runtime. I feel this is a necessary
step before adding DVCPRO HD support, because the look-up tables that
would be required for the HD format would be very large. DVCPRO HD has
about four times as many macroblocks as NTSC/PAL formats, and the
coordinate numbers won't fit in 16-bit entries anymore, so the table
would have to grow even more than that.
I cannot detect any measurable speed change with this patch compared to
the current look-up table code. If anything it may be slightly faster
due to smaller cache footprint.
(apologies for compressing the patch; it's 100KB uncompressed due to the
removal of large look-up tables)
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 21460 bytes
Desc: not available
More information about the ffmpeg-devel