[Libav-user] Questions about using libav in a multi-threaded application

Tr3wory tr3w at freemail.hu
Mon Jan 16 12:20:44 CET 2012

But I don't call the av_log myself. I just call some libav function to
decode a video, and during the processing it calls the av_log.
I can register my own log callback, but because I run more than one
decoding, I don't know where the log information came from.

In other libraries, I can set a pointer called userData or something
when I register a callback, and I can use this pointer in the callback
because I get it as a parameter.

Is this possible somehow in libav?


On Mon, Jan 16, 2012 at 12:13 PM, wl2776 <wl2776 at gmail.com> wrote:
> Yes, y
> Tr3wory wrote
>> Can't I just set some pointer in a context or somewhere else what I
>> can use in the callback like in most other callback driven library?
> Yes, you can.
> Generally, you call av_log(/*log level*/, /* context pointer */, "message",
> /*other arguments*/ );
> Default log callback casts context pointer from void * to AVClass * and
> extracts all necessary information from it.
> You can create your own variable of type AVClass and pass its pointer to the
> log.
> --
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