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Added status of the documents
Original commit message from CVS: Added status of the documents
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35 changed files with 115 additions and 4 deletions
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OUTDATED
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--------
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GstElementFactory:
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Base class for all elementfactories. Is a single-instance (per program)
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COMPLETELY OUTDATED
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-------------------
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A little explanation of the first autoplugger in GStreamer:
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Autoplugging is implemented in the following places:
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METADATA ON BUFFERS IS OUTDATED
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-------------------------------
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Buffer mutability properties are the most important part of gst, and
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similarly are the most complex.
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SOME OF THE FIRST IDEAS, PRETTY OUTDATED
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----------------------------------------
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During the course of a discussion on IRC, it turned out
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that there are many possible ways to handle the capabilities.
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STATUS: GstData is not implemented as a class for speed reasons.
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----------------------------------------------------------------
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NB: This document does not represent the current state of CVS but my current plans on how to implement this.
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Basics
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@ -10,14 +10,14 @@ and properties of a pad can be obtained from the elementfactory using
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the padtemplates.
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Dynamic pad usually have the presence indicator set to
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GST_PAD_FACTORY_SOMETIMES. This indicated that the pad might become
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GST_PAD_SOMETIMES. This indicated that the pad might become
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available at runtime. When the pad is actually created in the
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element, the element will signal the new_pad signal. This signal can
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then be used to attach a desired (compatible) element to the
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pad.
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For certain elements, like a tee and a muxer, we need another pad
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presence flag: GST_PAD_FACTORY_REQUEST. With this flag, the
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presence flag: GST_PAD_REQUEST. With this flag, the
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elementfactory will announce that some of the pads are available on
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request. For the tee element, for example, one might obtain a new output
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pad by looking up a suitable padtemplate (temp) and performing:
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OUTDATED
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--------
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case 1)
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EARLY DOCUMENT, NOT EXACTLY AS IMPLEMENTED
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------------------------------------------
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EVENTS RFC
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==========
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OUTDATED, methods have different names now
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------------------------------------------
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Here's a pipeline that does audio/video MPEG streams with a queue on
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either side of each decompressor, for a total of 5 threads (read/split,
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decode audio, decode video, play audio, play video):
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OUTDATED
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--------
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Face it, the plugins/ directory hierarchy is crap. We want to propose a
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better layout for it now. Some things to consider:
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GNOME Streamer is a pipeline-based media streaming framework. It is built
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on top of the Gtk+ object model, and while it currently sits on top of
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gtk, it can be divorced from it at any point in the future.
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on top of the gobject object model.
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A pipeline consists of at one or more each of sources, sinks, and filters.
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These elements may be combined inside container elements, which may have
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OUTDATED
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--------
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The point of the metadata is to provide some context for each buffer. In
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the case of audio data, for instance, it would provide the samplerate, bit
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depth, and channel count.
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OUTDATED
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--------
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What I propose for EOS condition is th following: As is stands, EOS is a
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flag in a buffer. However, it's also a signal from an element, which is
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odd. What I propose is that EOS become a pad thing. Here's how it would
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OUTDATED, EARLY IDEA
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--------------------
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When two pads are connected, a negotiation phase is going to have to
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happen. Ideally, the caps of the two pads will both be fully-specified,
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and match. That's the ideal case, but may rarely happen in practice.
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OUTDATED
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--------
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typedef gpointer GstCapsFactoryEntry;
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typedef GstCapsFactoryEntry GstCapsFactory[];
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typedef GstCapsFactory *GstCapsListFactory[];
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OUTDATED
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--------
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Plan generation happens at transition from NULL to READY (and PLAYING to READY right now, need to fix
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that). By way of some logic in gst_bin_change_state(), gst_bin_create_plan() is only called for the
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outer Bin, usually a Pipeline. This keeps things from getting nasty later on.
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STATUS: pushregion/pullregion is gone
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-------------------------------------
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Changed the way things are scheduled, especially sources. A Src used to
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have a push() function, and optionally a pushregion() to deal with async
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reads, etc. That whole thing has gone away, in favor of providing a
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STATUS: pull on srcpads is outdated, they use _get
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--------------------------------------------------
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0) definitions:
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All pads without further specifiers are assumed to belong to the element
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OUTDATED
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--------
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A type properties system might look like following:
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SOMEWHAT OUTDATED
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-----------------
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We describe how the plugin system works.
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Plugins
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OUTDATED
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--------
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GST State Bits and Transition Rules (graph to follow)
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-----------------------------------
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OUTDATED
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--------
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Since the plan generation only happens as a result of the state mechanism,
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I'll describe that first.
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OUTDATED
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--------
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GST States and Transition Rules (graph to follow)
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-------------------------------
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OUTDATED
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--------
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1. Introduction
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---------------
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SOMEWHAT OUTDATED, design still holds though
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--------------------------------------------
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1. Introduction
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---------------
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OUTDATED
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--------
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You might start by creating a source element and put it into a pipeline.
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At this point both element's state would be GST_STATE_NEW, since they
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don't have enough state to actually run yet. At this point you can set
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OUTDATED
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--------
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caps negotiation
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================
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OUTDATED
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--------
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pad has caps
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| pad has template
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OUTDATED
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--------
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EOS as implemented on Jan 21 2001:
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1) terminology
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OUTDATED
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--------
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case 1)
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OUTDATED
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--------
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case 1)
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OUTDATED
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--------
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case 1)
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OUTDATED
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--------
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case 1)
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INITIAL RAMBLINGS
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-----------------
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some random ramblings about the event system:
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Possible candidates for events
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OUTDATED
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--------
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problem
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-------
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