mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-23 18:21:04 +00:00
150 lines
6.2 KiB
Text
150 lines
6.2 KiB
Text
OUTDATED
|
|
--------
|
|
|
|
|
|
case 1)
|
|
|
|
(--------------------------------------------------)
|
|
! bin !
|
|
! (--------) (--------) (--------) !
|
|
! ! fakesrc! !identity! !fakesink! !
|
|
! ! src ----- sink src ---- sink ! !
|
|
! (--------) (--------) (--------) !
|
|
(--------------------------------------------------)
|
|
|
|
.scheduling.
|
|
|
|
case1 has just one scheduled entity (chain) no problem here.
|
|
|
|
.eos.
|
|
|
|
fakesrc detects the end of stream. It just returned the last buffer.
|
|
The next _pull will cause the srcpad to trigger gst_pad_set_eos ().
|
|
After that it will return a NULL buffer.
|
|
|
|
gst_pad_set_eos() will notify the parent about the plugins attempt to
|
|
signal eos. the parent adds the element to its possible EOS
|
|
providers.
|
|
|
|
gst_pad_set_eos() will by default propagate to identy and to fakesink.
|
|
none of these plugins override the default behaviour so gst_pad_set_eos
|
|
returns TRUE and fakesrc signals EOS with the value TRUE.
|
|
|
|
The parent looks in the list of EOS providers and finds the faksrc
|
|
element that is now signaling EOS. all EOS providers are now in EOS
|
|
and so the bin fires EOS.
|
|
|
|
|
|
|
|
case 2)
|
|
(---------------)
|
|
!thread !
|
|
(--------) (--------) (--------) ! (--------)!
|
|
! fakesrc! !identity! ! queue ! ! !fakesink!!
|
|
! src ----- sink src ---- sink src ---- sink !!
|
|
(--------) (--------) (--------) ! (--------)!
|
|
(---------------)
|
|
|
|
.scheduling.
|
|
|
|
case2 has two scheduled entities: fsr-i-q, q-fsk.
|
|
|
|
.eos.
|
|
|
|
fakesrc detects the end of stream. It just returned the last buffer.
|
|
The next _pull will cause the srcpad to trigger gst_pad_set_eos ().
|
|
After that it will return a NULL buffer.
|
|
|
|
gst_pad_set_eos() will notify the parent about the plugins attempt to
|
|
signal eos. the parent adds the element to its possible EOS
|
|
providers.
|
|
|
|
gst_pad_eos() will by default propagate to identy and to queue.
|
|
queue overrides the eos handler and returns false on the eos
|
|
request. fakesrc signals EOS with a value of false and the parent
|
|
bin removes the EOS provider from its list.
|
|
|
|
after the queue has sent out the last buffer, its calls eos on its
|
|
src pad. queue is added to the top level bin as an eos provider and
|
|
the default eos handler signals EOS with a value of TRUE to the parent.
|
|
|
|
the parent sees that all the eos providers are in eos now and signals
|
|
EOS.
|
|
|
|
|
|
case 3)
|
|
(---------------)
|
|
!thread !
|
|
(--------) (--------) (--------) ! (--------)!
|
|
! fakesrc! ! tee ! ! queue1 ! ! !fakesink!!
|
|
! src ----- sink src ---- sink src ---- sink !!
|
|
(--------) ! ! (--------) ! (--------)!
|
|
! ! (---------------)
|
|
! !
|
|
! ! (---------------)
|
|
! ! !thread !
|
|
! ! (--------) ! (--------)!
|
|
! ! ! queue2 ! ! !fakesink!!
|
|
! src ---- sink src ---- sink !!
|
|
! ! (--------) ! (--------)!
|
|
(--------) (---------------)
|
|
|
|
|
|
fakesrc detects the end of stream. It just sent the last buffer
|
|
and sets the srcpad to EOS with gst_pad_eos ().
|
|
|
|
the eos handler returns false because both queues return false on the
|
|
eos request. the parent removes fakesrc as an EOS provider.
|
|
|
|
queue1 and queue2 were responisble for the EOS delay and so they get
|
|
added to the bin as possible EOS providers.
|
|
|
|
after the queues have sent out their last buffer, they calls eos on their
|
|
src pads.
|
|
the parent allready has the two queues in the EOS provider list so they dont
|
|
get added twice.
|
|
the two queues perform gst_pad_eos () on their pads when the queue is empty,
|
|
the parent removes the EOS providers from its list, when the list is empty,
|
|
the parent fires EOS.
|
|
|
|
|
|
case 4)
|
|
|
|
(---------------)
|
|
!thread !
|
|
(--------) (----------) (--------) ! (--------)!
|
|
! fakesrc! !mpeg1parse! ! queue1 ! ! !fakesink!!
|
|
! src -- sink src ---- sink src ---- sink !!
|
|
(--------) ! ! (--------) ! (--------)!
|
|
! ! (---------------)
|
|
! !
|
|
! ! (---------------)
|
|
! ! !thread !
|
|
! ! (--------) ! (--------)!
|
|
! ! ! queue2 ! ! !fakesink!!
|
|
! src ---- sink src ---- sink !!
|
|
! ! (--------) ! (--------)!
|
|
(----------) (---------------)
|
|
|
|
|
|
this case differs from case3 in that one of the queues can be empty
|
|
while the other isn't. we assume queue1 is empty while queue2 isn't yet.
|
|
|
|
fakesrc detects the end of stream. It just sent the last buffer
|
|
and sets the srcpad to EOS with gst_pad_eos ().
|
|
|
|
the eos handler returns false because queue2 returns false on the
|
|
eos request. the parent removes fakesrc as an EOS provider.
|
|
|
|
queue2 was responisble for the EOS delay and so it gets added to the bin
|
|
as a possible EOS provider.
|
|
|
|
after the queue2 has sent its last buffer, it performs gst_pad_eos on its
|
|
src pad.
|
|
the parent allready has the queue2 in the list of EOS providers so it does not
|
|
get added twice.
|
|
queue2 finally fires the EOS signal and the parent removes the EOS provider
|
|
from its list, when the list is empty, the parent fires EOS.
|
|
|
|
|
|
|