[FFmpeg-trac] #1854(swscale:new): libswscale has unreasonable alignment constraints

FFmpeg trac at avcodec.org
Mon Mar 18 22:34:33 CET 2013

#1854: libswscale has unreasonable alignment constraints
             Reporter:  gjdfgh       |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:  swscale
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |

Comment (by michael):

 swscale does not revert to "the slow path" on misaligned data, it should
 just be slower because some operations are slower on misaligned data and
 some codepathes are not possible on misaligned data because the CPU
 instructions require aligned data.
 Please provide some specific examples where there are problems, like
 unreasonable slowdown, crashes (which would be a bug) or other. This
 feature request as such is hard to implement as its to vague.
 The suggestion about mixing unaligned and aligned is generally not
 possible as source & destination can have different alignmnet and even if
 they match the data tables then would likely not.

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1854#comment:3>
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