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69b40b46d2
Original commit message from CVS: Antoher way of dealing with EOS. This proposal does not use the recursion to propagate the EOS signal. This implies that an element cannot deny an EOS signal anymore but since the signal is generated when a NULL buffer is pushed, somebody did something wrong anyway.
73 lines
2.5 KiB
Text
73 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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