Added status of the documents

Original commit message from CVS:
Added status of the documents
This commit is contained in:
Wim Taymans 2002-08-02 11:23:05 +00:00
parent 92119614be
commit 7e0656ec4f
35 changed files with 115 additions and 4 deletions

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OUTDATED
--------
GstElementFactory: GstElementFactory:
Base class for all elementfactories. Is a single-instance (per program) Base class for all elementfactories. Is a single-instance (per program)

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COMPLETELY OUTDATED
-------------------
A little explanation of the first autoplugger in GStreamer: A little explanation of the first autoplugger in GStreamer:
Autoplugging is implemented in the following places: Autoplugging is implemented in the following places:

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METADATA ON BUFFERS IS OUTDATED
-------------------------------
Buffer mutability properties are the most important part of gst, and Buffer mutability properties are the most important part of gst, and
similarly are the most complex. similarly are the most complex.

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SOME OF THE FIRST IDEAS, PRETTY OUTDATED
----------------------------------------
During the course of a discussion on IRC, it turned out During the course of a discussion on IRC, it turned out
that there are many possible ways to handle the capabilities. 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.
----------------------------------------------------------------
NB: This document does not represent the current state of CVS but my current plans on how to implement this. NB: This document does not represent the current state of CVS but my current plans on how to implement this.
Basics Basics

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the padtemplates. the padtemplates.
Dynamic pad usually have the presence indicator set to Dynamic pad usually have the presence indicator set to
GST_PAD_FACTORY_SOMETIMES. This indicated that the pad might become GST_PAD_SOMETIMES. This indicated that the pad might become
available at runtime. When the pad is actually created in the available at runtime. When the pad is actually created in the
element, the element will signal the new_pad signal. This signal can element, the element will signal the new_pad signal. This signal can
then be used to attach a desired (compatible) element to the then be used to attach a desired (compatible) element to the
pad. pad.
For certain elements, like a tee and a muxer, we need another pad For certain elements, like a tee and a muxer, we need another pad
presence flag: GST_PAD_FACTORY_REQUEST. With this flag, the presence flag: GST_PAD_REQUEST. With this flag, the
elementfactory will announce that some of the pads are available on elementfactory will announce that some of the pads are available on
request. For the tee element, for example, one might obtain a new output request. For the tee element, for example, one might obtain a new output
pad by looking up a suitable padtemplate (temp) and performing: pad by looking up a suitable padtemplate (temp) and performing:

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OUTDATED
--------
case 1) case 1)

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EARLY DOCUMENT, NOT EXACTLY AS IMPLEMENTED
------------------------------------------
EVENTS RFC EVENTS RFC
========== ==========

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OUTDATED, methods have different names now
------------------------------------------
Here's a pipeline that does audio/video MPEG streams with a queue on Here's a pipeline that does audio/video MPEG streams with a queue on
either side of each decompressor, for a total of 5 threads (read/split, either side of each decompressor, for a total of 5 threads (read/split,
decode audio, decode video, play audio, play video): decode audio, decode video, play audio, play video):

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OUTDATED
--------
Face it, the plugins/ directory hierarchy is crap. We want to propose a Face it, the plugins/ directory hierarchy is crap. We want to propose a
better layout for it now. Some things to consider: 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 GNOME Streamer is a pipeline-based media streaming framework. It is built
on top of the Gtk+ object model, and while it currently sits on top of on top of the gobject object model.
gtk, it can be divorced from it at any point in the future.
A pipeline consists of at one or more each of sources, sinks, and filters. A pipeline consists of at one or more each of sources, sinks, and filters.
These elements may be combined inside container elements, which may have These elements may be combined inside container elements, which may have

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OUTDATED
--------
The point of the metadata is to provide some context for each buffer. In The point of the metadata is to provide some context for each buffer. In
the case of audio data, for instance, it would provide the samplerate, bit the case of audio data, for instance, it would provide the samplerate, bit
depth, and channel count. depth, and channel count.

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OUTDATED
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What I propose for EOS condition is th following: As is stands, EOS is a What I propose for EOS condition is th following: As is stands, EOS is a
flag in a buffer. However, it's also a signal from an element, which is flag in a buffer. However, it's also a signal from an element, which is
odd. What I propose is that EOS become a pad thing. Here's how it would odd. What I propose is that EOS become a pad thing. Here's how it would

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OUTDATED, EARLY IDEA
--------------------
When two pads are connected, a negotiation phase is going to have to When two pads are connected, a negotiation phase is going to have to
happen. Ideally, the caps of the two pads will both be fully-specified, happen. Ideally, the caps of the two pads will both be fully-specified,
and match. That's the ideal case, but may rarely happen in practice. and match. That's the ideal case, but may rarely happen in practice.

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OUTDATED
--------
typedef gpointer GstCapsFactoryEntry; typedef gpointer GstCapsFactoryEntry;
typedef GstCapsFactoryEntry GstCapsFactory[]; typedef GstCapsFactoryEntry GstCapsFactory[];
typedef GstCapsFactory *GstCapsListFactory[]; typedef GstCapsFactory *GstCapsListFactory[];

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OUTDATED
--------
Plan generation happens at transition from NULL to READY (and PLAYING to READY right now, need to fix Plan generation happens at transition from NULL to READY (and PLAYING to READY right now, need to fix
that). By way of some logic in gst_bin_change_state(), gst_bin_create_plan() is only called for the that). By way of some logic in gst_bin_change_state(), gst_bin_create_plan() is only called for the
outer Bin, usually a Pipeline. This keeps things from getting nasty later on. outer Bin, usually a Pipeline. This keeps things from getting nasty later on.

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STATUS: pushregion/pullregion is gone
-------------------------------------
Changed the way things are scheduled, especially sources. A Src used to Changed the way things are scheduled, especially sources. A Src used to
have a push() function, and optionally a pushregion() to deal with async have a push() function, and optionally a pushregion() to deal with async
reads, etc. That whole thing has gone away, in favor of providing a 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
--------------------------------------------------
0) definitions: 0) definitions:
All pads without further specifiers are assumed to belong to the element All pads without further specifiers are assumed to belong to the element

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OUTDATED
--------
A type properties system might look like following: A type properties system might look like following:

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SOMEWHAT OUTDATED
-----------------
We describe how the plugin system works. We describe how the plugin system works.
Plugins Plugins

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OUTDATED
--------
GST State Bits and Transition Rules (graph to follow) GST State Bits and Transition Rules (graph to follow)
----------------------------------- -----------------------------------

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OUTDATED
--------
Since the plan generation only happens as a result of the state mechanism, Since the plan generation only happens as a result of the state mechanism,
I'll describe that first. I'll describe that first.

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OUTDATED
--------
GST States and Transition Rules (graph to follow) GST States and Transition Rules (graph to follow)
------------------------------- -------------------------------

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OUTDATED
--------
1. Introduction 1. Introduction
--------------- ---------------

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SOMEWHAT OUTDATED, design still holds though
--------------------------------------------
1. Introduction 1. Introduction
--------------- ---------------

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OUTDATED
--------
You might start by creating a source element and put it into a pipeline. You might start by creating a source element and put it into a pipeline.
At this point both element's state would be GST_STATE_NEW, since they At this point both element's state would be GST_STATE_NEW, since they
don't have enough state to actually run yet. At this point you can set don't have enough state to actually run yet. At this point you can set

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OUTDATED
--------
caps negotiation caps negotiation
================ ================

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OUTDATED
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pad has caps pad has caps
| pad has template | pad has template

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OUTDATED
--------
EOS as implemented on Jan 21 2001: EOS as implemented on Jan 21 2001:
1) terminology 1) terminology

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OUTDATED
--------
case 1) case 1)

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OUTDATED
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case 1) case 1)

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OUTDATED
--------
case 1) case 1)

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OUTDATED
--------
case 1) case 1)

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INITIAL RAMBLINGS
-----------------
some random ramblings about the event system: some random ramblings about the event system:
Possible candidates for events Possible candidates for events

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OUTDATED
--------
problem problem
------- -------