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Added some more TODOs

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Original commit message from CVS:
Added some more TODOs
Added a proposition for eos propagation
This commit is contained in:
Wim Taymans 2001-01-01 19:54:01 +00:00
parent 4328a30762
commit 9977f8e252
2 changed files with 137 additions and 0 deletions
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4
docs/random/TODO-post-0.1.0
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@ -5,3 +5,7 @@
- Convert to GObject - Convert to GObject
- Get editor working better - Get editor working better
- make autoplugging algorithms pluggable
- make scheduling algorithms pluggable

133
docs/random/eos Normal file
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@ -0,0 +1,133 @@
case 1)
(--------) (--------) (--------)
! fakesrc! !identity! !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 ().
gst_pad_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 fakesink.
none of these plugins override the default behaviour so gst_pad_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 !!
(--------) (--------) (--------) ! (--------)!
(---------------)
fakesrc detects the end of stream. It just sent the last buffer
and sets the srcpad to EOS with gst_pad_eos ().
gst_pad_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 return 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.