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authorAndreas Rheinhardt <andreas.rheinhardt@gmail.com>2020-11-06 10:48:55 +0100
committerAndreas Rheinhardt <andreas.rheinhardt@gmail.com>2020-12-08 17:51:47 +0100
commit802fc678b262ea5d3523169184a9ec9503bf7807 (patch)
tree2444a0e4deb047af9fcad17be9dac12a4021d76b /libavutil/threadmessage.c
parent4cb4345f7895d1a169941df087152bf18f78a2f6 (diff)
downloadffmpeg-802fc678b262ea5d3523169184a9ec9503bf7807.tar.gz
avcodec/vp3: Use symbols table for VP3 motion vectors
Expressions like array[get_vlc2()] can be optimized by using a symbols table if the array is always the same for a given VLC. This requirement is fulfilled for the VLC used for VP3 motion vectors. The reason it hasn't been done before is probably that the array in this case contained entries in the range -31..31; but this is no problem with ff_init_vlc_from_lengths(): Just apply an offset of 31 to the symbols before storing them in the table used to initialize VP3 motion vectors and apply an offset of -31 when initializing the actual VLC. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Diffstat (limited to 'libavutil/threadmessage.c')
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