[FFmpeg-devel] [PATCH v3 1/2] lavf: Add general API for IO buffer synchronization.

Nicolas George george at nsup.org
Thu Dec 20 12:00:32 EET 2018

Andrey Semashev (2018-12-10):
> This commit adds a new set of functions to avio and url subsystems, which
> allow users to invoke IO buffer synchronization with the underlying media.
> The most obvious target for this extension if the filesystem streams. Invoking
> IO synchronization allows user applications to ensure that all written content
> has reached the filesystem on the media and can be observed by other processes.
> The public API for this is avio_sync() function, which can be called on
> AVIOContext. The internal, lower layer API is ffurl_sync(), which works
> directly on the underlying URLContext. URLContext backends can add support for
> this new API by setting the sync handler to the new url_sync member of
> URLProtocol. When no handler is set then the sync operation is a no-op,
> the result code is AVERROR(ENOSYS).
> ---
>  libavformat/avio.c    |  7 +++++++
>  libavformat/avio.h    | 20 ++++++++++++++++++++
>  libavformat/aviobuf.c | 17 +++++++++++++++++
>  libavformat/url.h     | 12 ++++++++++++
>  4 files changed, 56 insertions(+)

I have no more objections to the patch as it is, thanks. But I have no
opinion in favor of it either; it is useful in principle, but I do not
know if it is worth the extra maintenance for a use case like this
project. I will leave the judgement to others.


  Nicolas George
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