[FFmpeg-trac] #9397(undetermined:new): Allow any ADPCM block size to support XAudio2

[FFmpeg]

#9397: Allow any ADPCM block size to support XAudio2
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             Reporter:  Thomas       |                     Type:
  Cashman                            |  enhancement
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:
 Related to https://trac.ffmpeg.org/ticket/6585 and
 https://github.com/MonoGame/MonoGame/issues/5662

 Microsoft measures the size of a block in samples for XAudio2
 (https://msdn.microsoft.com/de-
 de/library/windows/desktop/ee415711(v=vs.85).aspx).

 From Github thread:
 FFMPEG forces the block size to be a power of 2 which appears to generate
 invalid samples per block. A block size of 70 would be needed to generate
 a valid 128 samples per block.

 How to reproduce:
 {{{
 % ffmpeg.exe -y -i sample.ogg -vn -c:a adpcm_ms -block_size 70 -b:a 128000
 -ar 36000 -f:a wav -strict experimental result.wav
 ffmpeg version 4.4
 Downloaded from https://github.com/BtbN/FFmpeg-Builds/releases
 }}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/9397>
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