shared memory

[sharo]

Hi there,

I have a video filter which needs to communicate(share resources) with an output access module in VLC. Is there some guidelines in terms of thread communication and shared memory in VLC.

Any help will be greatly appreciated!

Thanks.

[Jean-Baptiste Kempf]

You want to output data to memory from VLC or to VLC?

[sharo]

I guess both: from a VLC thread to another VLC thread

My video filter is running on a separate thread and every once in a while it receives a message which needs to be forwarded to an output_access module. Note that both the video filter and the output_access module are running at the same time.

Any ideas ?

[Rémi Denis-Courmont]

Whatever components starts the video filter and the access_out instances should provide them with a rendez-vous mechanism. VLC thread communications mechanisms are otherwise fairly standard: mutexes, condition variables, recursive mutexes, thread-specific variables, semaphores, spin locks.

[sharo]

Hi Remi,

Thanks for your response.

Could you please give me an example of existing code that I can take a look at.

[sharo]

Does anybody else have an idea about this.

Or if someone can point me to the right place within the VLC codebase - that will be greatly appreciated.

Thanks

[Rémi Denis-Courmont]

You can use the audiobargraph audio and video filters as an example.