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docs/design/part-element-transform.txt: Update docs.

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Original commit message from CVS:
* docs/design/part-element-transform.txt:
Update docs.
This commit is contained in:
Wim Taymans 2008-07-31 08:39:15 +00:00
parent 66d6f67b02
commit d022bc7a12
2 changed files with 16 additions and 3 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2008-07-31 Wim Taymans <wim.taymans@collabora.co.uk>
* docs/design/part-element-transform.txt:
Update docs.
2008-07-31 Wim Taymans <wim.taymans@collabora.co.uk>
* plugins/elements/gstqueue.c: (gst_queue_init),

14
docs/design/part-element-transform.txt
View file

@ -163,11 +163,14 @@ Negotiation
- start from src aps, these caps are fixed.
- check if the caps are acceptable for us as src caps. This is usually
enforced by the padtemplate of the element.
- check if the caps are acceptable for the peer. If this is possible, we can
- calculate all caps we can transform too with transform_caps()
- if the original caps are a subset of the transforms, try to see if the
the caps are acceptable for the peer. If this is possible, we can
perform passthrough and make src == dest. This is performed by simply
calling gst_pad_peer_accept_caps().
- if the caps are not acceptable, we need to transform to something,
for each of the transformed caps retrieved with transform_caps():
- if the caps are not fixed, we need to fixate it, start by taking the peer
caps and intersect with them.
- for each of the transformed caps retrieved with transform_caps():
- try to fixate the caps with fixate_caps()
- if the caps are fixated, check if the peer accepts them with
_peer_accept_caps(), if the peer accepts, we have found a dest caps.
@ -474,3 +477,8 @@ Use cases
sinkpad
- resizing the videosink makes videoscale perform the scaling.
Problematic
-----------
filesrc location=~/media/moveyourfeet.mov ! decodebin !
ffmpegcolorspace ! videoscale ! ffmpegcolorspace ! ximagesink -v