[osg-submissions] ImageStream and xine plugin

[Uwe Woessner]

Hello Robert,

I could throw out the env var and resubmit.
This would satisfy your last statement of consistency and it would keep 
the code simple.
I don´t think that a xine object pool would help many users. I was more 
concerned about memory consumption processing overhead during runtime of 
the movies. Rather than startup overhead. That´s why I thought having 
the option of a single xine would be nice. But if you don´t think its 
necessary, I won´t convert the env checking to it to ReaderWriter::Options.

  Uwe
Robert Osfield schrieb:
> Hi Uwe,
> 
> I've just done a review of your changes, and unfortunately they
> complicated things alot more than I'd like.
> 
> It seem like to me we need to have multiple xine objects, one per
> XineImageStream, rather than try to enable a single global xine object
> when the multiple xine is not enabled.  Perhaps for efficiency sake we
> could share xine objects between subsequent XineImageStream i.e. if
> one deallocates it could return its handle to ReaderWriterXine to pass
> on the the new attempt to create an XineImageStream.  This would leave
> a pool xine handles in ReaderWriterXine that it can clean up on exit -
> this should work fine though.
> 
> I would dispatch with all the env var checking though, this is just
> added complexity both in the implementation and in the usage of videos
> - i.e. under Linux we'd need to know about this special case and set
> the env var/ReaderWriter::Options to enable independent pausing.  This
> is so obscure that it almost certainly will catch people out.  I think
> it's best to just go for making functionality as consistent across all
> platforms out of the bag, even if this means a little extra overhead.
> 
> Robert.
> 
> On Fri, Jun 6, 2008 at 10:12 AM, Uwe Woessner <woessner at hlrs.de> wrote:
>> Hello,
>>
>> We wanted to play multiple movies. everyting works fine so far but as soon
>> as you want to stop one movie, all other movies stop as well.
>> The only work around we found is to use an individual xine instance for each
>> movie stream.
>> This is not desirable from a resource point of view if you don´t want to
>> stop individual streams, thus we check for an environment variable and only
>> use multiple xines if this is set.
>> Is there a better way to pass parameters to an osgDB plugin?
>> If not I would suggest to include the following changes.
>> See attached tar archive for the files.
>>
>> I would like to suggest the following changes:
>> OpenSceneGraph/include/osg/ImageStream
>> add STOPPED State
>> OpenSceneGraph/src/osgPlugins/xine/video_out_rgb.c
>> initialization of frame->chunk[0]
>> OpenSceneGraph/src/osgPlugins/xine/ReaderWriterXine.cpp
>> support for multiple xine instances
>>
>> Regards,
>>  Uwe
>>
>>
>> --
>>
>>           \\\|/// *HLRS, High Performance Computing Center Stuttgart*
>>  _I_       ( o o )                *Visualization/VR*             _I_
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>>  | |    Uwe Woessner             woessner at hlrs.de                | |
>>  | |       .ooo0       http://www.hlrs.de/people/woessner/       | |
>>  |_|       (   )  Oooo. Phone: +49-711-6856-5790 or ...-5970     |_|
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            \\\|/// *HLRS, High Performance Computing Center Stuttgart*
  _I_       ( o o )                *Visualization/VR*             _I_
(_ at _)--oo0O--(_)--O0oo------------------------------------------(_ at _)
  | |    Uwe Woessner             woessner at hlrs.de                | |
  | |       .ooo0       http://www.hlrs.de/people/woessner/       | |
  |_|       (   )  Oooo. Phone: +49-711-6856-5790 or ...-5970     |_|
(_ at _)-------\ (---(   )-----------------------------------------(_ at _)
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