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Added a simple mp3 mixer pipeline setup with an explanation of how EOS could be handled with it.

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Original commit message from CVS:
Added a simple mp3 mixer pipeline setup with an explanation of how EOS
could be handled with it.
This commit is contained in:
Wim Taymans 2001-01-12 22:44:41 +00:00
parent f607205951
commit f03c9fb1e7
1 changed files with 68 additions and 1 deletions
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69
docs/random/wtay/eos3
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@ -155,5 +155,72 @@ case 4)
it fires EOS. it fires EOS.
case 5)
(-----------------------------------------------------------------------)
! bin !
! (---------------) !
! !audiosink ! !
! (--------) (----------) (--------) ! ! !
! !disksrc1! ! effect ! ! mixer ! ! ! !
! ! src -- sink src ---- sink src -- sink ! !
! (--------) (----------) ! ! ! ! !
! ! ! (---------------) !
! (--------) (----------) ! ! !
! !disksrc2! ! effect ! ! ! !
! ! src -- sink src ---- sink ! !
! (--------) (----------) (--------) !
(-----------------------------------------------------------------------)
This is a simple audio mixer (mp3audio mixer).
We assume disksrc1 is going to be in EOS while disksrc2 is still in !EOS
.scheduling.
two chains are detected: disksrc1-effect-mixer-audiosink,
disksrc2-effect-mixer-audiosink
.eos.
disksrc1 has passed the last buffer in the _get function. with its next
call to _get, it will return a NULL buffer and set the src pad to EOS.
the EOS call travels up till the mixer element because it has overridden
the handler. The first chain is disabled from the scheduler.
finally disksrc2 run into EOS, same procedure as with disksrc1, except
now the mixer also sets EOS to its src pad, chain2 becomes inactive too
and the bin fires EOS because there are no more chains to schedule.
somebody sets the location of disksrc1 to a new mp3 file, the srcpad
is set to !EOS, chain1 is scheduled again, mixer is activated again too
and audio is playing again...