[FFmpeg-trac] #942(swresample:closed): swresample leaks memory when sampling up

[FFmpeg]

#942: swresample leaks memory when sampling up
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             Reporter:  beafdefx    |                    Owner:  michael
                 Type:  defect      |                   Status:  closed
             Priority:  normal      |                Component:  swresample
              Version:  git-master  |               Resolution:  invalid
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by beafdefx):

 I know where I went wrong.  I was not realizing here that the number of
 samples changes during a resample.  For some reason I was thinking that
 the width of a sample changes, which is not going to be the case unless
 the sample format changes as specified in the context.  So that was just
 my misunderstanding.

 But you touched on an auxiliary issue about rounding.  If I have
 arbitrarily large amount of audio to resample over time, and the ratio is
 not a nice multiple, what is the best way to avoid accumulating extra bits
 in the internal swresample buffer without having to push extra non-samples
 at the end of one of my buffers?  And, for that matter, I don't think this
 behavior of implicit buffering made perfectly clear to callers of the API
 so we can knowingly avoid or compensate.

 By the way, thanks for hanging with me on this one.  swresample definitely
 meets some specific needs of mine and dealing with memory well is
 absolutely crucial on limited mobile devices.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/942#comment:13>
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