[mythtv] ringbuffer.cpp

[Lincoln Rogers]

Hi JYA,

Thanks for your work on this. It seems to have solved all my issues with
watching an in-progress recording exiting when fast-forwarded to real time.
Haven't had any other problems with the change. Its greatly appreciated :-)

Lincoln.


On Mon, Mar 3, 2014 at 6:22 PM, Jean-Yves Avenard <jyavenard at gmail.com>wrote:

> On 3 March 2014 15:26, Bill Meek <keemllib at gmail.com> wrote:
> > Is this message supposed to be loglevel debug?
> >
> > 2014-03-02 22:08:02.032226 I [4857/4891] MythSocketThread(-1)
> > mythcorecontext.cpp:1151 (readyRead) - MythCoreContext: Received remote
> > 'FILE_WRITTEN /srv/mythtv-0/recordings/2615_20140303040000.mpg' request
> > 2014-03-02 22:08:02.239430 I [4857/4891] MythSocketThread(-1)
> > mythcorecontext.cpp:1151 (readyRead) - MythCoreContext: Received remote
> > 'FILE_WRITTEN /srv/mythtv-1/recordings/1021_20140303030000.mpg' request
> >
> > I've had over 5300 (with various channels) in the last 10 hours. None
> > were from LiveTV, they were scheduled recordings.
> >
> > They were all on a FE which is running: v0.28-pre-931-g2c71895.
> >
> > The message appears in: commit fafc658.
>
> Yes, those messages appear with loglevel=debug like all messages sent
> by the backend.
> FILE_WRITTEN is sent by the backend whenever a new file is created in
> write mode, and following that, no more than every 10s whenever a file
> is being written to.
>
> Those messages are needed in order to resolve one particular problem:
> when watching an in-progress recording, if you were to fast forward
> very close to the end, playback would exit.
>
> The reason was that the frontend had no way to differentiate during
> playback between reading a completed recording and reading an
> in-progress recording. So if it ever encountered an EOF (End Of File),
> it would simply exit, regardless of the backend still writing to the
> file or not.
>
> With those messages, every frontends can keep a record of while file
> are currently being written to and those that aren't.
>
> If during playback it encounters and EOF, if the file is still being
> written to by the backend (e.g. an in-progress recording) then it
> won't exit when encountering EOF, instead it will retry.
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