[FFmpeg-trac] #2388(undetermined:closed): ape: fail to seek

FFmpeg trac at avcodec.org
Mon Mar 25 21:54:56 CET 2013

#2388: ape: fail to seek
             Reporter:  ami_stuff    |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  ape          |               Resolution:  invalid
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by DonMoir):

 I am able to seek to any real time position on the test_2.ape file but
 it's slow. The bottleneck is in do_apply_filter of apedec.c when it calls:

    res = ctx->dsp.scalarproduct_and_madd_int16(f->coeffs, f->delay -
       f->adaptcoeffs - order,order, APESIGN(*data));

 APESIGN(*data) is always either -1, 0, or +1, so it seems it could be
 optimized on that and maybe table driven. I would have to think that it's
 been looked at in that regard but don't know. Not sure if it's worth the
 effort but something to think about.

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2388#comment:4>
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