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74 lines
2.5 KiB
Text
74 lines
2.5 KiB
Text
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case 1)
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(--------------------------------------------------)
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! bin !
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! (--------) (--------) (--------) !
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! ! fakesrc! !identity! !fakesink! !
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! ! 1 src ----- sink 1 src ---- sink 1 ! !
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! (--------) (--------) (--------) !
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! !
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! (--------) (--------) (--------) !
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! !fakesrc ! !identity! !fakesink! !
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! ! 2 src ----- sink 2 src ---- sink 2 ! !
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! (--------) (--------) (--------) !
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(--------------------------------------------------)
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just two scheduled chains in a single bin.
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.scheduling.
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we have two chains here fs1-i1-fsk1 and fs2-i2-fsk2
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fakesrc1 will output 1 buffer, fakesrc2 3 buffers
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.eos.
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fs1 will return a NULL buffer on EOS. the scheduler
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detects the NULL buffer and puts chain1 in EOS so that it
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doesn't get scheduled again. The scheduler fires the EOS
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signal for all the elements in the chain and puts the fs1
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element in the READY state.
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the same procedure happens for chain2. At that point, the bin
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has no chains to schedule and so it fires EOS.
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case 2)
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(---------------------------------------------------)
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! bin !
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! (--------) (--------) (---------) !
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! ! disksrc! ! mpg123 ! !audiosink! !
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! ! 1 src ----- sink 1 src ---- sink 1 ! !
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! (--------) (--------) (---------) !
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! !
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! (--------) (--------) (---------) !
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! !disksrc ! ! mpg123 ! !audiosink! !
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! ! 2 src ----- sink 2 src ---- sink 2 ! !
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! (--------) (--------) (---------) !
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(---------------------------------------------------)
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same as case 1, an mp3 mixer where the mixing is performed
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in hardware (in the audiosink).
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we want to show how the EOS state can be undone.
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.scheduling.
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we have two chains here ds1-mpg1-ask1 and ds2-mpg2-ask2
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the song in chain1 is about to end, chain2 has just begun
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playing a song.
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.eos.
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fs1 will return a NULL buffer on EOS. the scheduler
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detects the NULL buffer and puts chain1 in EOS so that it
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doesn't get scheduled again. The scheduler fires the EOS
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signal for all the elements in the chain and puts the fs1
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element in the READY state.
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the app sets the new location for the disksrc. The element is
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put in the PLAYING state, the chain is marked !EOS so that
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it will be scheduled again.
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