[FFmpeg-trac] #3921(avcodec:new): Faster RDFT

[FFmpeg]

#3921: Faster RDFT
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             Reporter:  ubitux       |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  fft rdft     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by ubitux):

 Replying to [comment:3 kurosu]:
 > Would ne nice to have a (short) sample program or a FFmpeg command line,
 ie anything needed to just measure the test case. I haven't looked but
 isn't the reason for this slowness the use of atypical lengths. IIRC audio
 codecs may have specifical short windows (max 2048 samples?).

 It tests for nbits from 9 to 13, so from 512 to 8192. It sounds pretty
 appropriate.

 Note: we use the RDFT code in area similar to what spek does; see
 showspectrum filter.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3921#comment:5>
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