[FFmpeg-trac] #7233(avcodec:new): Problem with decoding gta3 sound assets in c++ lang

[FFmpeg]

#7233: Problem with decoding gta3 sound assets in c++ lang
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             Reporter:  shfil    |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  avcodec  |                  Version:  unspecified
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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 Summary of the bug: ffmpeg 4.0 broke mp3 compatibility with openAL
 buffers(AV_SAMPLE_FMT_S16P)
 How to reproduce: download latest version of openRW(requires gta3 assets),
 after starting new game there's no sound in cutscenes (mp3 stereo example:
 BET.mp3)

 I think it's caused by switching from decoder mp3 to mp3float.

 I was trying to use workaround - libswresampler. Mp3 started working, but
 then started happen problems with mono wav(pcm). FFmpeg doesn't recognized
 channel_layout and crashes. To fix it I've set it manually every time when
 nr channels is equal one. But then when playing these sounds it possible
 to hear cracking/ticking. I would say artifacts.

 (there's also 80MB file with short pcm sounds, with resampling sounds are
 distorted and audible everywhere(in binaural mode))

 code:
 https://gist.github.com/ShFil119/ebd0cf30632c89aa393913b1abf52594

 pull on which I work:
 https://github.com/rwengine/openrw/pull/420/files

 manually trying to decode:
 https://gist.github.com/ShFil119/affd3afdaa737063dba5fd115277a720

 ffmpeg version 4.0
 built on arch linux

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Ticket URL: <https://trac.ffmpeg.org/ticket/7233>
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