Python libvlc_video_set_callbacks

[jorge.ab]

Hi,

I was trying to retrieve frames from a stream using (as with plain libvlc) libvlc_video_set_callbacks but realized the function is blacklisted on Python bindings.
I'm afraid I haven't found the reason nor the workaround, any clues?
My aim is to have the decoded frames from a media player on Python but cannot manage to find how to do it

Thanks in advance for your help.

Regards,

Jorge

[OlivierAubert]

The reason for the blacklisting was that libvlc_video_set_callbacks uses

Code: Select all

typedef void *(*libvlc_video_lock_cb)(void *opaque, void **planes);

as one of its parameters, and callback conversion did not handle this pattern. I have fixed this in the git tree, but it is completely untested apart from running the test suite, that does not check this function so I can only tell that it is syntactically correct.

Feel free to experiment with the new code and report issues and successes.

[test]

Dear Olivier, Jorge,

Could you please drop an example of these callback usage.
I have the same goal as Jorge --- need to get decoded frames (in real time)

I was trying (to start) to do something like this:

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@vlc.CallbackDecorators.VideoLockCb def _lockcb(opaque, planes): print "lock" return ctypes.create_string_buffer('\000') @vlc.CallbackDecorators.VideoUnlockCb def _unlockcb(opaque, pic, planes ): print "unlock" return ctypes.create_string_buffer('\000' ) @vlc.CallbackDecorators.VideoDisplayCb def _displaycb(opaque, picture): print "display" return ctypes.create_string_buffer('\000') a = ctypes.create_string_buffer('\000' * 2048) player.video_set_callbacks(_lockcb,_unlockcb, _displaycb,a)

But I have not enough knowledge to do so (the code I wrote might be nonsense).

When I run it, I got:
Parsing argument 1
TypeError: cannot build parameter
Segmentation fault

Could you please point me out to the error?