mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-25 11:11:08 +00:00
More ramblings..
Original commit message from CVS: More ramblings..
This commit is contained in:
Wim Taymans
parent
a588e5748b
commit
933bf32b3f
1 changed files with 119 additions and 77 deletions
|
|
@ -52,42 +52,6 @@ called, presumably causing a push out the other side of that element, and
|
|||
eventually data gets to the other end. The stack unrolls, and the
|
||||
iteration ends for that Src.
|
||||
|
||||
chained (alternative implementation)
|
||||
|
||||
bin src pad1 pad2 plugin
|
||||
! (= pad1->peer)
|
||||
gst_bin_iterate
|
||||
!
|
||||
! (find entry)
|
||||
!
|
||||
! (find src pad
|
||||
! of entry element)
|
||||
!
|
||||
! gst_pad_pull
|
||||
!------------------------------------------------>!
|
||||
? !
|
||||
!<------------------------------!
|
||||
!
|
||||
! (create buffer)
|
||||
!
|
||||
! gst_pad_push
|
||||
!------------------------------>!
|
||||
! (bufpen filled)
|
||||
(return buffer) !
|
||||
!<------------------------------------------------!
|
||||
!
|
||||
! gst_pad_chain
|
||||
!------------------------------------------------------------------->!
|
||||
!
|
||||
:
|
||||
(more chaining)
|
||||
:
|
||||
!<-------------------------------------------------------------------!
|
||||
!
|
||||
iteration ends
|
||||
!
|
||||
---
|
||||
-
|
||||
|
||||
|
||||
Cothreaded:
|
||||
|
|
@ -106,7 +70,7 @@ again in the next iteration.
|
|||
|
||||
|
||||
bin cothread1 src pad1 pad2 cothread2 plugin
|
||||
! (src) (= pad1->peer) (plugin)
|
||||
! (src) (= pad2->peer) (plugin)
|
||||
gst_bin_iterate
|
||||
!
|
||||
! (first entry)
|
||||
|
|
@ -190,11 +154,125 @@ again in the next iteration.
|
|||
:
|
||||
|
||||
|
||||
(alternative implementation):
|
||||
-----------------------------------------------------------------------------------------------
|
||||
1b) Simple push-function based with multiple output
|
||||
|
||||
Chained:
|
||||
|
||||
Similar to the single output variant, except several chains are spawned
|
||||
off, one per push, hanging off whichever pad the buffer is pushed off of.
|
||||
The stack will grow and unwind as many times as buffers are pushed out.
|
||||
|
||||
(current implementation)
|
||||
|
||||
bin src pad1 pad2 plugin
|
||||
! (= pad1->peer)
|
||||
gst_bin_iterate
|
||||
!
|
||||
! (find entry)
|
||||
!
|
||||
! gst_src_push
|
||||
!---------------->!
|
||||
! (create buffer)
|
||||
!
|
||||
! gst_pad_push
|
||||
!---------------->!
|
||||
!
|
||||
! pad1->chainfunc (pad1->peer)
|
||||
!------------------------------->!
|
||||
! !
|
||||
: :
|
||||
(more chaining)
|
||||
: :
|
||||
!<-------------------------------!
|
||||
!<----------------!
|
||||
! (create buffer)
|
||||
!
|
||||
! gst_pad_push
|
||||
!---------------->!
|
||||
!
|
||||
! pad1->chainfunc (pad1->peer)
|
||||
!------------------------------->!
|
||||
! !
|
||||
: :
|
||||
(more chaining)
|
||||
: :
|
||||
!<-------------------------------!
|
||||
!<----------------!
|
||||
:
|
||||
(more pushes)
|
||||
:
|
||||
!<-----------------!
|
||||
!
|
||||
iteration ends
|
||||
!
|
||||
---
|
||||
-
|
||||
|
||||
|
||||
Cothreaded:
|
||||
|
||||
Also similar to the single output variant. When the pull winds its way
|
||||
back from the first push, execution returns to the Src's _push function,
|
||||
which simply goes off and pushes out another buffer, causing another
|
||||
series of context switches. Eventually the loopfunc wrapper starts over,
|
||||
round and round we go.
|
||||
|
||||
|
||||
|
||||
-----------------------------------------------------------------------------------------------
|
||||
2) Pull-function based with single output
|
||||
|
||||
Similar to a regular filter with a chain function associated with each
|
||||
pad, this kind of source doesn't provide a src-wide push function, but
|
||||
does provide pullfuncs for its pad. A pullfunc puts a buffer in the pen
|
||||
and exits.
|
||||
|
||||
Chained:
|
||||
|
||||
bin src pad1 pad2 plugin
|
||||
! (= pad1->peer)
|
||||
gst_bin_iterate
|
||||
!
|
||||
! (find entry)
|
||||
!
|
||||
! (find src pad
|
||||
! of entry element)
|
||||
!
|
||||
! gst_pad_pull
|
||||
!------------------------------------------------>!
|
||||
? !
|
||||
!<------------------------------!
|
||||
!
|
||||
! (create buffer)
|
||||
!
|
||||
! gst_pad_push
|
||||
!------------------------------>!
|
||||
! (bufpen filled)
|
||||
(return buffer) !
|
||||
!<------------------------------------------------!
|
||||
!
|
||||
! gst_pad_chain
|
||||
!------------------------------------------------------------------->!
|
||||
!
|
||||
:
|
||||
(more chaining)
|
||||
:
|
||||
!<-------------------------------------------------------------------!
|
||||
!
|
||||
iteration ends
|
||||
!
|
||||
---
|
||||
-
|
||||
|
||||
As usual, is likely to be an entry into a Bin. The Bin iterate code must
|
||||
explicitely pull a buffer and pass it on to the peer.
|
||||
|
||||
Cothreaded:
|
||||
|
||||
|
||||
bin cothread1 src pad1 pad2 cothread2 plugin
|
||||
! (src) (= pad1->peer) (plugin)
|
||||
! (src) (= pad2->peer) (plugin)
|
||||
gst_bin_iterate
|
||||
!
|
||||
! (first entry)
|
||||
|
|
@ -236,47 +314,11 @@ again in the next iteration.
|
|||
! (bufpen empty)
|
||||
!<-----------!
|
||||
! cothread switch
|
||||
!<------------------------------------!
|
||||
!-------------------!
|
||||
!<----------------!
|
||||
!<----------------!
|
||||
!
|
||||
iteration ends
|
||||
!
|
||||
:
|
||||
|
||||
-----------------------------------------------------------------------------------------------
|
||||
1b) Simple push-function based with multiple output
|
||||
|
||||
Chained:
|
||||
|
||||
Similar to the single output variant, except several chains are spawned
|
||||
off, one per push, hanging off whichever pad the buffer is pushed off of.
|
||||
The stack will grow and unwind as many times as buffers are pushed out.
|
||||
|
||||
Cothreaded:
|
||||
|
||||
Also similar to the single output variant. When the pull winds its way
|
||||
back from the first push, execution returns to the Src's _push function,
|
||||
which simply goes off and pushes out another buffer, causing another
|
||||
series of context switches. Eventually the loopfunc wrapper starts over,
|
||||
round and round we go.
|
||||
|
||||
|
||||
|
||||
-----------------------------------------------------------------------------------------------
|
||||
2) Pull-function based with single output
|
||||
|
||||
Similar to a regular filter with a chain function associated with each
|
||||
pad, this kind of source doesn't provide a src-wide push function, but
|
||||
does provide pullfuncs for its pad. A pullfunc puts a buffer in the pen
|
||||
and exits.
|
||||
|
||||
Chained:
|
||||
|
||||
As usual, is likely to be an entry into a Bin. The Bin iterate code must
|
||||
explicitely pull a buffer and pass it on to the peer.
|
||||
|
||||
Cothreaded:
|
||||
|
||||
|
||||
---- ok, I'll finish this tomorrow when my brain's working again.... ----
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue