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docs: update trickmode document

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Wim Taymans 2009-05-13 23:38:08 +02:00 committed by Wim Taymans
parent cc7985ab48
commit 0f83510620
1 changed files with 3 additions and 1 deletions
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4
docs/design/part-trickmodes.txt
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@ -44,6 +44,7 @@ When performing a seek, the following steps have to be taken by the application:
- how accurate the seek should be (ACCURATE)
- how to perform the seek (FLUSH)
- what to do when the stop position is reached (SEGMENT).
- extra playback options (SKIP)
- a format to seek in, this can be time, bytes, units (frames, samples), ...
- a playback rate, 1.0 is normal playback speed, positive values bigger than 1.0
mean fast playback. negative values mean reverse playback. A playback speed of
@ -135,7 +136,8 @@ client side forward trickmodes
The seek happens as stated above. a NEW_SEGMENT event is sent downstream with a rate
different from 1.0. Plugins receiving the NEW_SEGMENT can decide to perform the
rate conversion of the media data (retimestamp video frames, resample audio, ...).
A plugin can also decide to drop frames in the case of fast playback or use a more
A plugin should not drop frames unless the SKIP flag is set. When the SKIP flag is
set, a plugin can decide to drop frames in the case of fast playback or use a more
efficient decoding algorithm (skip B frames, ...). If a plugin decides to resample
or retimestamp, it should modify the NEW_SEGMENT with a rate of 1.0 and update the
applied rate so that downstream elements don't resample again but are aware that the