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