[FFmpeg-trac] #5862(avcodec:new): A clipping value of ADPCM is different from specifications.

FFmpeg trac at avcodec.org
Sun Sep 25 10:33:32 EEST 2016


#5862: A clipping value of ADPCM is different from specifications.
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  kei_kissinger                      |                 Priority:  normal
               Status:  new          |                  Version:  git-
            Component:  avcodec      |  master
             Keywords:  ADPCM 24567  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 source code: adpcm.c
 function: adpcm_yamaha_expand_nibble
 line: c->step = av_clip(c->step, 127, 24567);
 fail: 24567 must be 24576.

 reference about specification:
 http://nemesis.hacking-cult.org/MegaDrive/Documentation/YM2608J.PDF --
 scanned image in japanese. page 44 (5)

 http://nemesis.hacking-
 cult.org/MegaDrive/Documentation/YM2608J%20Translated.PDF -- translated
 into English. page 44 (5)

 also another dokument,
 http://www.dtech.lv/files_ym/ym2610.pdf page 6 und 7

 Thank you.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5862>
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