mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-24 02:31:03 +00:00
87 lines
3 KiB
Text
87 lines
3 KiB
Text
OUTDATED
|
|
--------
|
|
|
|
|
|
case 1)
|
|
|
|
(--------------------------------------------------)
|
|
! bin !
|
|
! (--------) (--------) (--------) !
|
|
! ! fakesrc! !identity! !fakesink! !
|
|
! ! 1 src ----- sink 1 src ---- sink 1 ! !
|
|
! (--------) (--------) (--------) !
|
|
! !
|
|
! (--------) (--------) (--------) !
|
|
! !fakesrc ! !identity! !fakesink! !
|
|
! ! 2 src ----- sink 2 src ---- sink 2 ! !
|
|
! (--------) (--------) (--------) !
|
|
(--------------------------------------------------)
|
|
|
|
just two scheduled chains in a single bin.
|
|
|
|
.scheduling.
|
|
|
|
we have two chains here fs1-i1-fsk1 and fs2-i2-fsk2
|
|
fakesrc1 will output 1 buffer, fakesrc2 3 buffers
|
|
|
|
.eos.
|
|
|
|
fs1 will call gst_pad_set_eos (src, TRUE) on its srcpad
|
|
in the _get function and returns a NULL buffer.
|
|
|
|
gst_pad_set_eos will recurse down the pipeline and set
|
|
all the pads in i1 and fsk1 to EOS too. none of these elements
|
|
override the default behaviour so gst_pad_set_eos returns TRUE.
|
|
|
|
fakesrc signals EOS. since an element in chain1 has signales
|
|
EOS, chain1 becomes EOS. All the elements in the chain are set
|
|
to the READY state and the chain is not scheduled anymore because
|
|
its EOS flag is on.
|
|
|
|
the same procedure happens for chain2. At that point, the bin
|
|
has no chains to schedule and so it fires EOS.
|
|
|
|
|
|
case 2)
|
|
|
|
(---------------------------------------------------)
|
|
! bin !
|
|
! (--------) (--------) (---------) !
|
|
! ! disksrc! ! mpg123 ! !audiosink! !
|
|
! ! 1 src ----- sink 1 src ---- sink 1 ! !
|
|
! (--------) (--------) (---------) !
|
|
! !
|
|
! (--------) (--------) (---------) !
|
|
! !disksrc ! ! mpg123 ! !audiosink! !
|
|
! ! 2 src ----- sink 2 src ---- sink 2 ! !
|
|
! (--------) (--------) (---------) !
|
|
(---------------------------------------------------)
|
|
|
|
same as case 1, an mp3 mixer where the mixing is performed
|
|
in hardware (in the audiosink).
|
|
we want to show how the EOS state can be undone.
|
|
|
|
.scheduling.
|
|
|
|
we have two chains here ds1-mpg1-ask1 and ds2-mpg2-ask2
|
|
the song in chain1 is about to end, chain2 has just begun
|
|
playing a song.
|
|
|
|
.eos.
|
|
|
|
disksrc1 will set the src pad to EOS with gst_pad_set_eos (pad, TRUE)
|
|
the call recurses up and down, disksrc1 signals EOS. the chain with
|
|
disksrc1 becomes EOS and is excluded from the scheduling algorithm.
|
|
disksrc1 is set to the READY state.
|
|
|
|
the user then changes the location of disksrc1 to the new mp3 song.
|
|
The user then sets the element state of disksrc to PLAYING. disksrc
|
|
performs gst_pad_set_eos (pad, FALSE)
|
|
|
|
the call recurses up and down and returns TRUE. chain1 is set to !EOS
|
|
so that it will be scheduled again.
|
|
|
|
disksrc1 is set to PLAYING and the new mp3 is playing again.
|
|
|
|
|
|
|