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docs/pwg/intro-preface.xml: Rewrite preface.
Original commit message from CVS: * docs/pwg/intro-preface.xml: Rewrite preface.
This commit is contained in:
Ronald S. Bultje
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2 changed files with 92 additions and 38 deletions
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@ -1,3 +1,8 @@
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2004-11-06 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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* docs/pwg/intro-preface.xml:
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Rewrite preface.
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2004-11-06 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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* docs/pwg/advanced-scheduling.xml:
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@ -92,28 +92,29 @@
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filter for illustration.
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</para>
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<para>
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This part covers all the basic steps you generally need to perform to
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build a plugin. The discussion begins by giving examples of generating
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the basic structures with <xref linkend="chapter-building-boiler"/>. Then
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you will learn how to write the code to get a basic filter plugin
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working: These steps include chapters on <xref
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linkend="chapter-building-types"/>, <xref linkend="chapter-building-pads"/>,
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<xref linkend="chapter-building-chainfn"/>, and <!-- <xref
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linkend="chapter-building-state"/>--> (WRITEME: building state).
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This part covers all the basic steps you generally need to perform
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to build a plugin, such as registering the element with &GStreamer;
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and setting up the basics so it can receive data from and send data
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to neighbour elements. The discussion begins by giving examples of
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generating the basic structures and registering an element in
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<xref linkend="chapter-building-boiler"/>. Then, you will learn how
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to write the code to get a basic filter plugin working in <xref
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linkend="chapter-building-pads"/>, <xref
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linkend="chapter-building-chainfn"/> and <xref
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linkend="chapter-statemanage-states"/>.
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</para>
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<para>
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After you have finished the first steps, you will be able to create a
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working plugin, but your new plugin might not have all the
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functionality you need. To provide some standard functionality, you
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will learn how to add more features to a new plugin. These features
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are described in the chapters on
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<!--FIXME: WRITEME <xref linkend="chapter-building-props"/> -->
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(WRITEME)
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and <xref linkend="chapter-building-signals"/>.
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Finally, you will see in
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<!--<xref linkend="chapter-building-testapp"/>-->(WRITEME)
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how to write a short test
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application to try out your new plugin.
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After that, we will show some of the GObject concepts on how to
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make an element configurable for applications and how to do
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application-element interaction in
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<xref linkend="chapter-building-args"/> and <xref
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linkend="chapter-building-signals"/>. Next, you will learn to build
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a quick test application to test all that you've just learned in
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<xref linkend="chapter-building-testapp"/>. We will just touch upon
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basics here. For full-blown application development, you should
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look at <ulink type="http"
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url="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/index.html">the
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Application Development Manual</ulink>.
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</para>
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</listitem>
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<listitem>
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@ -125,14 +126,64 @@
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After learning about the basic steps, you should be able to create a
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functional audio or video filter plugin with some nice features.
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However, &GStreamer; offers more for plugin writers. This part of the
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guide includes chapters on more advanced topics, such as <xref
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linkend="chapter-advanced-request"/>, <!-- <xref
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linkend="chapter-advanced-clock"/>, <xref
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linkend="chapter-advanced-scheduling"/>, <xref
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linkend="chapter-advanced-dparams"/>, and <xref
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linkend="chapter-advanced-midi"/>-->. Since these features are more advanced,
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the chapters can basically be read in any order, as you find that your
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plugins require these features.
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guide includes chapters on more advanced topics, such as scheduling,
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media type definitions in &GStreamer;, clocks, interfaces and
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tagging. Since these features are purpose-specific, you can read them
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in any order, most of them don't require knowledge from other
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sections.
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</para>
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<para>
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The first chapter, named <xref linkend="chapter-loopbased-sched"/>,
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will explain some of the basics of element scheduling. It is not
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very in-depth, but is mostly some sort of an introduction on why
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other things work as they do. Read this chapter if you're interested
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in &GStreamer; internals. Next, we will apply this knowledge and
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discuss another type of data transmission than what you learned in
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<xref linkend="chapter-building-chainfn"/>: <xref
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linkend="chapter-loopbased-loopfn"/>. Loop-based elements will give
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you more control over input rate. This is useful when writing, for
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example, muxers or demuxers.
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</para>
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<para>
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Next, we will discuss media identification in &GStreamer; in <xref
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linkend="chapter-building-types"/>. You will learn how to define
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new media types and get to know a list of standard media types
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defined in &GStreamer;.
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</para>
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<para>
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In the next chapter, you will learn the concept of request- and
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sometimes-pads, which are pads that are created dynamically, either
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because the application asked for it (request) or because the media
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stream requires it (sometimes). This will be in <xref
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linkend="chapter-advanced-request"/>.
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</para>
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<para>
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The next chapter, <xref linkend="chapter-advanced-clock"/>, will
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explain the concept of clocks in &GStreamer;. You need this
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information when you want to know how elements should achieve
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audio/video synchronization.
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</para>
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<para>
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The next few chapters will discuss advanced ways of doing
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application-element interaction. Previously, we learned on the
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GObject-ways of doing this in <xref linkend="chapter-building-args"/>
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and <xref linkend="chapter-building-signals"/>. We will discuss
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dynamic parameters, which are a way of defining element behaviour
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over time in advance, in <xref linkend="chapter-dparams"/>. Next,
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you will learn about interfaces in <xref
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linkend="chapter-advanced-interfaces"/>. Interfaces are very target-
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specific ways of application-element interaction, based on GObject's
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GInterface. Lastly, you will learn about how metadata is handled in
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&GStreamer; in <xref linkend="chapter-advanced-tagging"/>.
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</para>
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<para>
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The last chapter, <xref linkend="chapter-advanced-events"/>, will
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discuss the concept of events in &GStreamer;. Events are, on the
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one hand, another way of doing application-element interaction. It
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atkes care of seeking, for example. On the other hand, it is also
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a way in which elements interact with each other, such as letting
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each other know about media stream discontinuities, forwarding tags
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inside a pipeline and so on.
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</para>
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</listitem>
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<listitem>
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@ -146,10 +197,11 @@
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the concepts apply equally to other plugin types, including sources,
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sinks, and autopluggers. This part of the guide presents the issues
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that arise when working on these more specialized plugin types. The
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part includes chapters on <xref linkend="chapter-other-source"/>, <xref
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linkend="chapter-other-sink"/>, <!-- FIXME: WRITEME
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<xref linkend="chapter-other-scheduler"/>,--> and
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<xref linkend="chapter-other-autoplugger"/>.
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part includes chapters on <xref linkend="chapter-other-source"/>,
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<xref linkend="chapter-other-sink"/>, <xref
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linkend="chapter-other-oneton"/> (including demuxers), <xref
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linkend="chapter-other-ntoone"/> (including muxers) and <xref
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linkend="chapter-other-manager"/>.
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</para>
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</listitem>
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<listitem>
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@ -158,12 +210,9 @@
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information for plugin developers.
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</para>
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<para>
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The appendices contain some information that stubbornly refuses to fit
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cleanly in other sections of the guide. This information includes
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<!-- FIXME: WRITEME
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<xref linkend="chapter-appendix-checklist"/>--> (WRITEME) and
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<!-- <xref
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linkend="chapter-appendix-python"/>.--> FIXME: organize better.
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The appendices contain some information that stubbornly refuses
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to fit cleanly in other sections of the guide. Most of this section
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is not yet finished.
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</para>
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</listitem>
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</itemizedlist>
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