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design/preroll: grammar and reflow fixes

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Reynaldo H. Verdejo Pinochet 2016-12-19 15:18:24 -08:00
parent 8273bae135
commit 7821f05e72
1 changed files with 5 additions and 5 deletions
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markdown/design/preroll.md
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@ -3,7 +3,7 @@
A sink element can only complete the state change to `PAUSED` after a
buffer has been queued on the input pad or pads. This process is called
prerolling and is needed to fill the pipeline with buffers so that the
transition to `PLAYING` goes as fast as possible with no visual delay for
transition to `PLAYING` goes as fast as possible, with no visual delay for
the user.
Preroll is also crucial in maintaining correct audio and video
@ -15,13 +15,13 @@ EOS message. While waiting, the sink will wait for the preroll cond to
be signalled.
Several things can happen that require the preroll cond to be signalled.
This include state changes or flush events. The prerolling is
These include state changes or flush events. The prerolling is
implemented in sinks (see [element-sink](design/element-sink.md)
## Committing the state
When going to `PAUSED` and `PLAYING` a buffer should be queued in the pad.
We also make this requirement for going to `PLAYING` since a flush event
We also make this a requirement for going to `PLAYING` since a flush event
in the `PAUSED` state could unqueue the buffer again.
The state is commited in the following conditions:
@ -30,8 +30,8 @@ The state is commited in the following conditions:
- an GAP event is received on a sinkpad.
- an EOS event is received on a sinkpad.
We require the state change to be commited in EOS as well since an EOS
means by definition that no buffer is going to arrive anymore.
We require the state change to be commited in EOS as well, since an EOS
, by definition, means no buffer is going to arrive anymore.
After the state is commited, a blocking wait should be performed for the
next event. Some sinks might render the preroll buffer before starting