[FFmpeg-devel] rtsp/rtp - blocking loop in udp_read_packet

[Anthony Champagne]

I've started to modify url_*interrupt_cb but the problem is harder that it
seems. I couldn't pass a AVFormatContext because avio.h doesn't know
anything about this struct, and passing URLContext doesn't help because
RTSPStream and RTSPState structures are private (declared in rtsp.c). 

Probably url_*interrupt_cb is defined in the wrong file, and doesn't take
the right name. Perhaps in avformat.h directly in AVFormatContext as a
function pointer field would be a better place ?

A complete implementation of nonblocking reads involve removing hack like
rtp_get_file_handles()/select() call in udp_read_packet() and implement a
url_list_create() url_list_probe_read() or something like that, which manage
blocking/nonblocking URLContext. Am I wrong?

Anyway, thanks for your answer :) I think I'll choose your patch for the
moment.

Anthony

-----Message d'origine-----
De?: ffmpeg-devel-bounces at mplayerhq.hu
[mailto:ffmpeg-devel-bounces at mplayerhq.hu] De la part de elupus
Envoy??: mercredi 23 avril 2008 11:42
??: ffmpeg-devel at mplayerhq.hu
Objet?: Re: [FFmpeg-devel] rtsp/rtp - blocking loop in udp_read_packet

Anthony Champagne <anthony.champagne <at> haxe.fr> writes:


> What do you think of, could it be part of a patch ? or is there another
way
> (except threadlock entire av_read_packet() call with a previously
> initialized global variable with format context) to achieve my needs ?
> 
> Anthony Champagne
> 

I posted a patch a while back that caused the read function to behave semi 
nonblocking and return EAGAIN if no data was available. You could
potentially 
use that. 
http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/57508/focus=57881

But as Luca pointed out. It's not entire complete as it could still stall 
during a read + it's not really the correct use for that flag as sockets are

really not nonblocking.

A complete implementation of nonblocking reads or fixing up the abort
function 
to give context would be accepted as a patch.

Regards
Joakim



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