Le 17 févr. 06 à 07:28, Olivier <email@hidden> a écrit :
Hello,
I need to write a component that should be called any time an
application wants to play video through QuickTime so it can check
some data in the movie file (in media "Initialize") and either
modify it before playing or let QT do its things as usual.
I thought of creating a derived media handler to override the Apple
Video Media Handler ('mhlr'/'vide') which seems to be used for
every kind of video files I must check. I decided to capture this
media handler so that each time an application opens a video movie,
my component is called first. It can then check if it must act on
the media or not. If not, it just calls the original media handler.
Otherwise it edits the data (in the idle function) before drawing
it with the regular codec.
Since my first post, I worked more on this project and I also
modified the qdmediahandler and qdmediamaker code samples so that
they work in Xcode and so that the qdmediahandler can be linked into
qdmediamaker and be traced easily. And I found the difference that
makes it work while my component does not: the SubType! If I change
the subtype of my own component to the one of qdmediahandler, my
component functions are properly called when I open a movie using
qdmediahandler media.
So the real question comes down to: How to override the Apple Video
Media Handler (type: 'mhlr'; subtype: 'vide'; manufacturer: 'appl')
so that my component (type: 'mhlr'; subtype: 'vide'; manufacturer:
'TEST') is called for more functions than Open, CanDo and Close?
I also tried to trace the different selectors used but it did not
make lot of sense to me so far (almost no selector belonging to the
media handler range is used!)...
Please, can someone tell me what I do wrong and how I can have my
component used to play 'vide' medias? This is driving me crazy!
Many thanks in advance.
Olivier
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