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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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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 accurate the seek should be (ACCURATE)
- how to perform the seek (FLUSH) - how to perform the seek (FLUSH)
- what to do when the stop position is reached (SEGMENT). - 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 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 - 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 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 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 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, ...). 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 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 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 applied rate so that downstream elements don't resample again but are aware that the