On 15.2.2011 16:19, Leandro Santiago wrote:
Thx for your answer.
Do you have any examples? Where need I use this callback? When I open
the video? Which parameters are necessary to this function? I couldn't
find much information searching on web.
Hello,
here is my code with the callback function to realize a timeout on
av_read_frame. It is written in C++ with Visual Studio in Windows, but
with a little change also usable in other systems.
First you have to initialize the call back function in libav. At this
time libav call this function in blocking functions (av_read_frame)
url_set_interrupt_cb(decode_interrupt_cb);
The implementation of this function looks like that:
LONGLONG timeout; //für decode_interuppt_cb
static int decode_interrupt_cb(void)
{
LARGE_INTEGER ptime;
QueryPerformanceCounter(&ptime);
if (ptime.QuadPart > timeout) //timeout arrived?
return 1;
//return 0 for no timeout
return 0;
}
In the program every time i call a blocking function of libav I set a
new timeout (ptime):
QueryPerformanceCounter(&ptime);
timeout = ptime.QuadPart + pfreq.QuadPart *5; //Timeout
res = av_read_frame(decforctx,&re_pkt);
The QueryperformanceCounter is a 64 bit value of windows. The frequnecy
depends on the architecture of the pc, but is constant. I use it as a
relative time to define the timeout. The Callback function check the
time and decide to skip the function of libav.
I hope the code helps you.
Steffen
_______________________________________________
libav-user mailing list
[email protected]
https://lists.mplayerhq.hu/mailman/listinfo/libav-user
