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docs: small docs updates

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This commit is contained in:
Wim Taymans 2010-01-19 16:39:38 +01:00
parent 053ada3308
commit 6078dc4931
2 changed files with 20 additions and 7 deletions
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9
docs/design/part-qos.txt
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@ -54,11 +54,14 @@ QoS message
----------- -----------
Whenever QoS discards a piece of data or affects the quality of the stream, a Whenever QoS discards a piece of data or affects the quality of the stream, a
message must be posted by the element that performed the QoS. message must be posted by the element that performed the QoS. We assume that
the time gained by dropping the data outweighs the time spend in creating and
posting the QoS message so that posting the message should not cause more
performance problems.
This message can be posted by a sink/src that performs synchronisation against the This message can be posted by a sink/src that performs synchronisation against the
clock or it could be dropped by an upstream element that performs QoS because of clock or it could be dropped by an upstream element that performs QoS because of
QOS events received from downstream. QOS events received from a downstream element.
- live: G_TYPE_BOOLEAN: - live: G_TYPE_BOOLEAN:
If the QoS message was dropped by a live element such as a sink or a live If the QoS message was dropped by a live element such as a sink or a live
@ -72,7 +75,7 @@ QOS events received from downstream.
The lateness of the buffer. The lateness of the buffer.
- proportion, G_TYPE_DOUBLE: - proportion, G_TYPE_DOUBLE:
Long term prediction of the ideal rate. Long term prediction of the ideal rate.
Optional stats: Optional stats:

18
docs/design/part-seeking.txt
View file

@ -2,9 +2,9 @@ Seeking
------- -------
Seeking in GStreamer means configuring the pipeline for playback of the Seeking in GStreamer means configuring the pipeline for playback of the
media between a certain start and stop time, called a segment. By default a media between a certain start and stop time, called the playback segment.
pipeline will play from position 0 to the total duration of the media at a rate By default a pipeline will play from position 0 to the total duration of the
of 1.0. media at a rate of 1.0.
A seek is performed by sending a seek event to the sink elements of a A seek is performed by sending a seek event to the sink elements of a
pipeline. Sending the seek event to a bin will by default forward pipeline. Sending the seek event to a bin will by default forward
@ -13,7 +13,9 @@ the event to all sinks in the bin.
When performing a seek, the start and stop values of the segment can be When performing a seek, the start and stop values of the segment can be
specified as absoulte positions or relative to the currently configured specified as absoulte positions or relative to the currently configured
playback segment. Note that it is not possible to seek relative to the current playback segment. Note that it is not possible to seek relative to the current
playback position. playback position. To seek relative to the current playback position, one must
query the position first and then perform an absolute seek to the desired
position.
Feedback of the seek operation can be immediatly using the GST_SEEK_FLAG_FLUSH Feedback of the seek operation can be immediatly using the GST_SEEK_FLAG_FLUSH
flag. With this flag, all pending data in the pipeline is discarded and playback flag. With this flag, all pending data in the pipeline is discarded and playback
@ -55,6 +57,14 @@ are allowed to skip decoding. This can be useful when resource consumption is
more important than accurately producing all frames. more important than accurately producing all frames.
Seeking in push based elements
------------------------------
Generating seeking events Generating seeking events
------------------------- -------------------------