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pwg: small tweaks to negotiation

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This commit is contained in:
Wim Taymans 2012-10-15 13:59:50 +02:00
parent bbcdafa05f
commit 92a44a6e32
1 changed files with 20 additions and 9 deletions
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29
docs/pwg/advanced-negotiation.xml
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@ -317,7 +317,9 @@ gst_my_filter_sink_event (GstPad *pad,
<listitem>
<para>
If the element prefers to operate in passthrough mode, check
if downstream accepts the caps with the ACCEPT_CAPS query.
if downstream accepts the caps with the ACCEPT_CAPS query. If it
does, we can complete negotiation and we can operate in
passthrough mode.
</para>
</listitem>
<listitem>
@ -334,7 +336,9 @@ gst_my_filter_sink_event (GstPad *pad,
<listitem>
<para>
Select from the downstream list the first caps that you can
transform to and set this as the output caps.
transform to and set this as the output caps. You might have to
fixate the caps to some reasonable defaults to construct
fixed caps.
</para>
</listitem>
</itemizedlist>
@ -444,12 +448,6 @@ gst_my_filter_chain (GstPad *pad,
</sect2>
</sect1>
<sect1 id="section-nego-pullmode">
<title>Pull-mode Caps negotiation</title>
<para>
</para>
</sect1>
<sect1 id="section-nego-upstream" xreflabel="Upstream caps (re)negotiation">
<title>Upstream caps (re)negotiation</title>
<para>
@ -489,13 +487,17 @@ gst_my_filter_chain (GstPad *pad,
<para>
Elements that operate in transform negotiation according to
<xref linkend="section-nego-transform"/> pass the RECONFIGURE
event upstream.
event upstream. Because these elements simply do a fixed transform
based on the upstream caps, they need to send the event upstream
so that it can select a new format.
</para>
</listitem>
<listitem>
<para>
Elements that operate in fixed negotiation
(<xref linkend="section-nego-fixed"/>) drop the RECONFIGURE event.
These elements can't reconfigure and their output caps don't depend
on the upstream caps so the event can be dropped.
</para>
</listitem>
<listitem>
@ -580,6 +582,15 @@ gst_my_filter_query (GstPad *pad, GstObject * parent, GstQuery * query)
}
]]>
</programlisting>
</sect1>
<sect1 id="section-nego-pullmode">
<title>Pull-mode Caps negotiation</title>
<para>
WRITEME, the mechanism of pull-mode negotiation is not yet fully
understood.
</para>
<para>
Using all the knowledge you've acquired by reading this chapter, you
should be able to write an element that does correct caps negotiation.