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docs/design/part-sparsestreams.txt: Update sparse streams doc

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Original commit message from CVS:
* docs/design/part-sparsestreams.txt:
Update sparse streams doc
This commit is contained in:
Jan Schmidt 2006-01-19 09:08:15 +00:00
parent 872ad1b6f5
commit 6a8c739673
2 changed files with 15 additions and 6 deletions
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@ -1,3 +1,8 @@
2006-01-19 Jan Schmidt <thaytan@mad.scientist.com>
* docs/design/part-sparsestreams.txt:
Update sparse streams doc, hopefully for greater clarity
2006-01-18 Jan Schmidt <thaytan@mad.scientist.com> 2006-01-18 Jan Schmidt <thaytan@mad.scientist.com>
* docs/design/part-events.txt: * docs/design/part-events.txt:

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docs/design/part-sparsestreams.txt
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@ -43,11 +43,15 @@ Details
packets, and is effectively updating the minimum-timestamp for that stream. packets, and is effectively updating the minimum-timestamp for that stream.
A demuxer can do this by sending an 'update' NEWSEGMENT with a new start time A demuxer can do this by sending an 'update' NEWSEGMENT with a new start time
to the subtitle pad. For example, every time the SCR in the MPEG data to the subtitle pad. For example, every time the SCR in MPEG data
advances more than 0.5 seconds, the MPEG demuxer can issue a NEWSEGMENT with advances more than 0.5 seconds, the MPEG demuxer can issue a NEWSEGMENT with
(update=TRUE, start=SCR ). Downstream elements can then be aware not to (update=TRUE, start=SCR ). Downstream elements can then be aware not to
expect any data older than the new start time. expect any data older than the new start time.
The same holds true for any element that knows the current position in the
stream - once the element knows that there is no more data to be presented
until time 'n' it can advance the start time of the current segment to 'n'.
This technique can also be used, for example, to represent a stream of This technique can also be used, for example, to represent a stream of
MIDI events spaced to a clock period. When there is no event present for MIDI events spaced to a clock period. When there is no event present for
a clock time, a NEWSEGMENT update can be sent in its place. a clock time, a NEWSEGMENT update can be sent in its place.
@ -70,12 +74,12 @@ Details
* Send a NEWSEGMENT to restart playback with the next timestamp in the * Send a NEWSEGMENT to restart playback with the next timestamp in the
stream. stream.
The upstream element performing the wait MUST be marked as LIVE element, to The upstream element performing the wait must only do so when in the PLAYING
prevent GStreamer from attempting to preroll the element during a still frame state. During PAUSED, the clock will not be running, and may not even have
wait. been distributed to the element yet.
DRAIN is a new event that will block on the pad until all data downstream has DRAIN is a new event that will block on a src pad until all data downstream
been played out. has been played out.
Flushing after completing the still wait is to ensure that data after the wait Flushing after completing the still wait is to ensure that data after the wait
is played correctly. Without it, sinks will consider the first buffers is played correctly. Without it, sinks will consider the first buffers