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manual: fix another typo and some inaccuracies

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Fix a wrong statement and flesh out section on messages and queries
a bit.
This commit is contained in:
Tim-Philipp Müller 2010-06-17 09:33:43 +01:00
parent 80ece8a4be
commit 8bfc2cc0c8
1 changed files with 16 additions and 10 deletions
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26
docs/manual/intro-basics.xml
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@ -108,32 +108,38 @@
<itemizedlist>
<listitem>
<para>
<emphasis>buffers</emphasis>: are objects for passing streaming data
<emphasis>buffers</emphasis> are objects for passing streaming data
between elements in the pipeline. Buffers always travel from sources
to sinks (downstream).
</para>
</listitem>
<listitem>
<para>
<emphasis>events</emphasis>: are objects send between elements or from
<emphasis>events</emphasis> are objects sent between elements or from
the application to elements. Events can travel upstream and downstream.
Downstream events can be synchronised to the data flow.
</para>
</listitem>
<listitem>
<para>
<emphasis>messages</emphasis>: are objects send from elements over the
bus to the application. Messages can be received synchronously, but
then from the streaming thread context of the sender or asynchronously
marshalled to the main thread of the application.
<emphasis>messages</emphasis> are objects posted by elements on
the pipeline's message bus, where they will be held for collection
by the application. Messages can be intercepted synchronously from
the streaming thread context of the element posting the message, but
are usually handled asynchronously by the application from the
application's main thread. Messages are used to transmit information
such as errors, tags, state changes, buffering state, redirects etc.
from elements to the application in a thread-safe way.
</para>
</listitem>
<listitem>
<para>
<emphasis>queries</emphasis>: allow application to request information
from the pipeline. Queries are answered synchronously. Also elements
can use queries. They can be used both ways, but most common are
downstream queries.
<emphasis>queries</emphasis> allow applications to request information
such as duration or current playback position from the pipeline.
Queries are always answered synchronously. Elements can also use
queries to request information from their peer elements (such as the
file size or duration). They can be used both ways within a pipeline,
but upstream queries are more common.
</para>
</listitem>
</itemizedlist>