Merge added builder documentation
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7 changed files with 3049 additions and 23 deletions
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doc/devel/draw/Lumi.Architecture-1.svg
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doc/devel/draw/Lumi.Architecture-1.svg
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style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;opacity:1;color:#000000;fill:#004380;fill-opacity:0.63369966;fill-rule:evenodd;stroke:#005a80;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:0.71062275;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
|
||||
xml:space="preserve"><tspan
|
||||
sodipodi:role="line"
|
||||
id="tspan14759"
|
||||
x="243.81104"
|
||||
y="292.75879">(re)-Building</tspan></text>
|
||||
</g>
|
||||
</svg>
|
||||
|
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@ -578,8 +578,9 @@ The first step towards an solution is to isolate the problem; obviously we //nee
|
|||
[img[how to implement Automation|uml/fig129669.png]]
|
||||
</pre>
|
||||
</div>
|
||||
<div title="BasicBuildingOperations" modifier="Ichthyostega" modified="200804121734" created="200712040334" tags="design dynamic Builder" changecount="23">
|
||||
<div title="BasicBuildingOperations" modifier="Ichthyostega" modified="200805210230" created="200712040334" tags="design dynamic Builder" changecount="24">
|
||||
<pre>Starting out from the concepts of Objects, Placement to Tracks, render Pipes and connection properties (&rarr; see [[here|TrackPipeEDL]]) within the EDL, we can identify the elementary operations occuring within the Builder. Overall, the Builder is organized as application of //visiting tools// to a collection of objects, so finally we have to consider some object kind appearing in the working function of the given builder tool, which holds at this moment some //context//. The job now is to organize this context such as to create a predictable build process from this //event driven// approach.
|
||||
&rarr;see also: BuilderPrimitives for the elementary situations used to cary out the building operations
|
||||
|
||||
!Builder working Situations
|
||||
# any ''Clip'' (which at this point has been reduced already to a part of a simple elementary media stream &rarr; see [[Fixture]])
|
||||
|
|
@ -728,7 +729,7 @@ config.macros.timeline.handler = function(place,macroName,params,wikifier,paramS
|
|||
}
|
||||
//}}}</pre>
|
||||
</div>
|
||||
<div title="BuildProcess" modifier="Ichthyostega" modified="200712100440" created="200706190658" tags="dynamic Builder" changecount="27">
|
||||
<div title="BuildProcess" modifier="Ichthyostega" modified="200805210213" created="200706190658" tags="dynamic Builder" changecount="28">
|
||||
<pre>All decisions on //how // the RenderProcess has to be carried out are concentrated in this rather complicated Builder Subsystem. The benefit of this approach is, besides decoupling of subsystems, to keep the actual performance-intensive video processing code as simple and transparent as possible. The price, in terms of increased complexity &mdash; to pay in the Builder &mdash; can be handled by making the Build Process generic to a large degree. Using a Design By Contract approach we can decompose the various decisions into small decision modules without having to trace the actual workings of the Build Process as a whole.
|
||||
|
||||
[>img[Outline of the Build Process|uml/fig129413.png]]
|
||||
|
|
@ -737,8 +738,10 @@ The building itself will be broken down into several small tool application step
|
|||
* for each segment: generate a ProcNode for each found MObject and wire them accordingly
|
||||
Note, //we still have to work out how exactly building, rendering and playback work// together with the backend-design. The build process as such doesn't overly depend on these decisions. It is easy to reconfigure this process. For example, it would be possible as well to build for each frame separately (as Cinelerra2 does), or to build one segment covering the whole timeline (and handle everything via [[Automation]]
|
||||
|
||||
&rarr;see also: [[Builder Overview|Builder]]
|
||||
&rarr;see also: BasicBuildingOperations
|
||||
&rarr;see also: BuilderStructures
|
||||
&rarr;see also: BuilderMechanics
|
||||
&rarr;see also: PlanningBuildFixture
|
||||
&rarr;see also: PlanningSegementationTool
|
||||
&rarr;see also: PlanningNodeCreatorTool
|
||||
|
|
@ -746,7 +749,7 @@ Note, //we still have to work out how exactly building, rendering and playback w
|
|||
[img[Colaborations in the Build Process|uml/fig128517.png]]
|
||||
</pre>
|
||||
</div>
|
||||
<div title="Builder" modifier="Ichthyostega" modified="200712100631" created="200706220317" tags="def overview" changecount="24">
|
||||
<div title="Builder" modifier="Ichthyostega" modified="200805210209" created="200706220317" tags="def overview" changecount="26">
|
||||
<pre>The Builder takes some MObject/[[Placement]] information (called Timeline) and generates out of this a Render Engine configuration able to render this Objects. It does all decisions and retrieves the current configuration of all objects and plugins, so the Render Engine can just process them stright forward.
|
||||
|
||||
The Builder is the central part of the [[Builder Pattern|http://en.wikipedia.org/wiki/Builder_pattern]]
|
||||
|
|
@ -754,12 +757,81 @@ The Builder is the central part of the [[Builder Pattern|http://en.wikipedia.org
|
|||
As the builder has to create a render node network implementing most of the features and wiring possible with the various MObject kinds and placement types, it is a rather complicated piece of software. In order to keep it manageable, it is broken down into several specialized sub components:
|
||||
* clients access builder functionality via the BuilderFacade
|
||||
* the [[Proc-Layer-Controller|Controller]] initiates the BuildProcess and does the overall coordination of scheduling edit operations, rebuilding the fixture and triggering the Builder
|
||||
* to carry out the building, we use several tools (SegmentationTool, NodeCreaterTool,...), which are supplied by the [[tool factory|BuilderToolFactory]]
|
||||
* the actual building (i.e. the application of those tools to the timeline) is done by the [[Assembler|BuilderAssembler]], which is basically a collection of functions (but has a small amount of global configuration state)
|
||||
* to carry out the building, we use several primary tools (SegmentationTool, NodeCreaterTool,...), together with a BuilderToolKit to be supplied by the [[tool factory|BuilderToolFactory]]
|
||||
* //operating the Builder// can be viewed at from two different angles, either emphasizing the [[basic building operations|BasicBuildingOperations]] employed to assemble the render node network, or focussing rather at the [[mechanics|BuilderMechanics]] of cooperating parts while processing.
|
||||
* besides, we can identify a small set of elementary situations we call [[builder primitives|BuilderPrimitives]], to be covered by the mentioned BuilderToolKit; by virtue of [[processing patterns|ProcPatt]] they form an [[interface to the rule based configuration|BuilderRulesInterface]].
|
||||
* the actual building (i.e. the application of tools to the timeline) is done by the [[Assembler|BuilderAssembler]], which is basically a collection of functions (but has a small amount of global configuration state)
|
||||
* any non-trivial wiring of render nodes, tracks, pipes and automation is done by the services of the [[connection manager|ConManager]]
|
||||
</pre>
|
||||
</div>
|
||||
<div title="BuilderStructures" modifier="Ichthyostega" modified="200801031929" created="200706250734" tags="overview design Builder" changecount="18">
|
||||
<div title="BuilderMechanics" modifier="Ichthyostega" created="200805210256" tags="design dynamic Builder" changecount="1">
|
||||
<pre>The cooperation of several components creates a context of operation for the primary builder working tool, the [[node creator|PlanningNodeCreatorTool]]:
|
||||
* the BuilderToolFactory acts as the "builder for the builder tools", i.e. we can assume to be able to retrive all needed primary tools and elementary tools from this factory, completely configured and ready to use.
|
||||
* the [[Assembler|BuilderAssembler]] has the ability to consume objects from the high level model and feed them to the node creator (which translates into a dispatch of individual operations suited to the objects to be treated). This involves some sort of scheduling or ordering of the operaions, which is the only means to direct the overall process such as to create a sensible and usable result. //This is an fundamental design decision:// the actual working tools have no hard wired knowledge of the "right process", which makes the whole Builder highly configurable ("open").
|
||||
* the [[connection manager|ConManager]] on the contrary is a passive service provider. Fed with [[wiring requests|WiringRequest]], he can determine if a desired connection is possible, and what steps to take to implement it; the latter recursively creates further building requests to satisfy by the assembler, and possibly new wiring requests.
|
||||
|
||||
!!pattern of operation
|
||||
The working pattern of this builder mechanics can be described as triggering, enqueuing, priorizing, recursing and exhausting. Without the priorizing part, it would be a depth-first call graph without any context state, forcing us to have all cross reference information available at every node or element to be treated. We prefer to avoid this overhead by ordering the operations into several phases and within these phases into correlated entities with the help of a ''weighting function'' and scheduling with a ''priority queue''</pre>
|
||||
</div>
|
||||
<div title="BuilderMould" modifier="Ichthyostega" created="200805260248" tags="def" changecount="1">
|
||||
<pre>The [[Builder]] uses different kinds of tools for creating a network of render nodes from a given high-level model. When breaking down this (necessarily complex) process into small manageable chunks, we arrive at [[elementary building situations|BuilderPrimitives]]. For each of these there is a specialized tool. We denote these tools as "moulds" because they are a rather passive holder for the objects to be attached and wired up. They are shaped according to the basic form the connections have to follow for each of these basic situations:
|
||||
* attaching an effect to a pipe
|
||||
* combining pipes via a transition
|
||||
* starting out a pipe from a source reader
|
||||
* general connections from the exit node of a pipe to the port of another pipe
|
||||
In all those cases, the active part is provided by [[processing patterns|ProcPatt]] &mdash; sort of micro programs executed within the context of a given mould: the processing pattern defines the steps to take (in the standard/basic case this is just "attach"), while the mould holds and provides the location where these steps will operate.</pre>
|
||||
</div>
|
||||
<div title="BuilderPrimitives" modifier="Ichthyostega" modified="200805260332" created="200805210327" tags="impl spec Builder" changecount="25">
|
||||
<pre>While assembling and building up the render engines node network, a small number of primitive building situations is encountered repeatedly. The BuilderToolKit provides a "[[mould|BuilderMould]]" for each of these situations, typically involving parametrisation and the application of a [[processing pattern|ProcPatt]].
|
||||
|
||||
The ''Lifecycle'' of such a mould starts out by arming it with the object references involved into the next building step. After conducting this building step, the resulting render nodes can be found &mdash; depending on the situation &mdash; attached either to the same mould, or to another kind of mould, but in any case ready to be included in the next building step. Thus, //effectively//&nbsp; the moulds are //used to handle the nodes being built,// due to the fact that the low-level model (nodes to be built) and the high-level model (objects directing what is to be built) are //never connected directly.//
|
||||
|
||||
!List of elementary building situations
|
||||
!!!inserting an Effect or Plugin
|
||||
[>img[draw/builder-primitives1.png]]
|
||||
The __~PipeMould__ is used to chain up the effects attached to a clip (=local pipe) or global pipe (=bus)
|
||||
* participating: a Pipe and an Effect
|
||||
* point of reference: current exit node of the pipe
|
||||
* result: Effect appended at the pipe's exit node
|
||||
* returns: ~PipeMould holding onto the new exit node
|
||||
|
||||
@@clear(right):display(block):@@
|
||||
|
||||
|
||||
!!!attaching a transition
|
||||
[>img[draw/builder-primitives2.png]]
|
||||
After having completed N pipe's node chains, a __~CombiningMould__ can be used to join them into a [[transition|TransitionsHandling]]
|
||||
* participating: N pipe's exit nodes, transition
|
||||
* point of reference: N exit nodes corresponding to (completed) pipes
|
||||
* result: transition has been attached with the pipe's exit nodes, new wiring requests created attached to the transition's exit node(s)
|
||||
* returns: ~WiringMould, connected with the created wiring request
|
||||
Using this mould implicitly "closes" the involved pipes, which means that we give up any reference to the exit node and can't build any further effect attached to this pipes. Generally speaking, "exit node" isn't a special kind of node, rather it's a node we are currently holding on. Similarly, there is nothing directly correlated to a pipe within the render nodes network after we are done with building the part of the network corresponding to the pipe; the latter serves rather as a blueprint for building, but isn't an entity in the resulting low-level model.
|
||||
Actually, there is {{red{planned}}} a more general (and complicated) kind of transition, which can be inserted into N data connections without joining them together into one single output, as the standard transitions do. The ~CombiningMould can handle this case too by just returning N wiring moulds as a result.
|
||||
|
||||
@@clear(right):display(block):@@
|
||||
|
||||
!!!building a source connection
|
||||
[>img[draw/builder-primitives3.png]]
|
||||
The __~SourceChainMould__ is used as a starting point for any further building, as it results in a local pipe (=clip) rooted at the clip source port. This reflects the fact that the source readers (=media access points) are the //leaf nodes// in the node graph we are about to build.
|
||||
* participating: source port of a clip, media access point, [[processing pattern|ProcPatt]]
|
||||
* point of reference: //none//
|
||||
* result: processing pattern has been //executed//, resulting in a chain of nodes from the source reader to the clip source port
|
||||
* returns: ~PipeMould holding onto the new exit node (of a yet-empty pipe)
|
||||
|
||||
@@clear(right):display(block):@@
|
||||
|
||||
!!!wiring a general connection
|
||||
Any wiring (outside the chain of effects within a pipe) is always done from exit nodes to the port of another pipe, requiring an [[wiring request|WiringRequest]] already checked and deemed resolvable. Within the __~WiringMould__ the actual wiring is conducted, possibly adding a summation node (called "overlayer" in case of video) and typically a fader element (the specific setup to be used is subject to configuration by processing patterns)
|
||||
* participating: already verified connection request, providing a Pipe and an exit node; a processing pattern and a Placement
|
||||
* points of reference: exit node and (optionally) starting point of a pipe's chain (in case there are already other connections)
|
||||
* result: summation node prepended to the port of the pipe, processing pattern has been //executed// for building the connection from the exit node to the pipe's port, ParamProvider has been setup in [[accordance|PlacementDerivedDimension]] to the Placement.
|
||||
* returns: ~PipeMould holding onto the destination pipe's exit node, ~WiringMould holding onto the port side of the same pipe, i.e. the destination where further connections will insert summation nodes. {{red{TODO how to handle the //empty//-case?}}}
|
||||
[>img[draw/builder-primitives4.png]]
|
||||
|
||||
@@clear(right):display(block):@@
|
||||
</pre>
|
||||
</div>
|
||||
<div title="BuilderStructures" modifier="Ichthyostega" modified="200805210227" created="200706250734" tags="overview design Builder" changecount="21">
|
||||
<pre>* the MObjects implement //Buildable//
|
||||
* each Buildable can "receive" a Tool object and apply it
|
||||
* the different Tool objects are iterated/mapped onto the list of MObjects in the [[Timeline]]
|
||||
|
|
@ -769,10 +841,35 @@ As the builder has to create a render node network implementing most of the feat
|
|||
** a given Tool instance can carry state while being iterated, so we don't need any global (or object-global) variables to hold the result of the build process
|
||||
|
||||
This programming technique is often referred to as [["double dispatch" or "visitor"|VisitorUse]]. We use a specialized library implementation of this pattern &mdash; heavily inspired by the [[Loki library|http://loki-lib.sourceforge.net/]]. We use this approach not only for the builder, but also for carrying out operations on the objects in the EDL in a typesafe manner.
|
||||
For the actual building operations see BasicBuildingOperations {{red{TODO:flesh out the actual Operations}}}
|
||||
|
||||
|
||||
It is the low level foundation of the actual [[building operations|BasicBuildingOperations]] necessary to create render nodes starting from the given high level model.
|
||||
[img[Entities cooperating in the Builder|uml/fig129285.png]]
|
||||
|
||||
!Colaborations
|
||||
|
||||
While building, the application of such a visiting tool (especially the [[NodeCreatorTool|PlanningNodeCreatorTool]]) is embedded into an execution context formed by the BuilderToolFactory providing our BuilderToolKit, the [[Assembler|BuilderAssembler]] and [[connection manager|ConManager]]. The colaboration of these parts can be seen as the [[mechanics of the builder|BuilderMechanics]] &mdash; sort of the //outward view//, contrary to the //invard aspects// visible when focussing on how the nodes are put together.
|
||||
|
||||
[img[Colaborations in the Build Process|uml/fig128517.png]]
|
||||
|
||||
</pre>
|
||||
</div>
|
||||
<div title="BuilderToolKit" modifier="Ichthyostega" modified="200805260414" created="200805210308" tags="impl Builder" changecount="5">
|
||||
<pre>Besides the primary working tool within the builder (namely the [[Node Creator Tool|PlanningNodeCreatorTool]]), on a lower level, we encounter several [[elementary building situations|BuilderPrimitives]] &mdash; and for each of these elementary situations we can retrieve a suitable "fitting tool" or [[mould|BuilderMould]]. The palette of these moulds is called the ''tool kit'' of the builder. It is subject to configuration by rules.
|
||||
|
||||
!! {{red{open questions}}}
|
||||
* how to address these moulds
|
||||
* how to type them
|
||||
* how to parametrize them
|
||||
|
||||
!!addressing a mould
|
||||
All mould instances are owned and managed by the [[tool factory|BuilderToolFactory]], and can be referred to by their type ({{{PipeMould}}}, {{{CombiningMould}}}, {{{SourceChainMould}}}, {{{WiringMould}}}) and a concrete object instance (of suitable type). The returned mould (instance) acts as a handle to stick together the given object instance (from the high-level model) with the corresponding point in the low-level node network under construction. As consequence of this approach, the tool factory instance holds a snapshot of the current building state, including all the active spots in the build process. As the latter is driven by objects from the high-level model appearing (in a sensible order &rarr; see BuilderMechanics) within the NodeCreatorTool, new moulds will be created and fitted as necessary, and existing moulds will be exhausted when finished, until the render node network is complete.
|
||||
|
||||
!!configuring a mould
|
||||
As each mould kind is different, it has a {{{prepare(...)}}} function with suitably typed parameters. The rest is intended to be self-configuring (for example, a ~CombiningMould will detect the actual kind of Transition and select the internal mode of operation), so that it's sufficient to just call {{{operate()}}}
|
||||
|
||||
!!sequence of operations
|
||||
When {{{operate()}}} doesn't throw, the result is a list of //successor moulds// &mdash; you shouldn't use the original mould after triggering its operation, because it may have been retracted as a result and reused for another purpose by the tool factory. It is not necessary to store these resulting moulds either (as they can be retrieved as described above), but they can be used right away for the next building step if applicable. In the state they are returned from a successful building step (mould operation = execution of a contained [[processing pattern|ProcPatt]]), they are usually already holding a reference to the part of the network just created and need to be configured only with the next high-level object (effect, placement, pipe, processing pattern or similar, depending on the concrete situation) in order to carry out the next step.
|
||||
|
||||
&rarr;see also: BuilderPrimitives for the elementary working situations corresponding to these fitting tools
|
||||
</pre>
|
||||
</div>
|
||||
<div title="ColorPalette" modifier="Ichthyostega" modified="200706260455" created="200706190033" tags="excludeMissing" changecount="11">
|
||||
|
|
@ -2315,12 +2412,12 @@ The GUI can connect the viewer(s) to some pipe (and moreover can use [[probe poi
|
|||
|
||||
</pre>
|
||||
</div>
|
||||
<div title="PipeHandling" modifier="Ichthyostega" modified="200804061705" created="200801101352" tags="spec" changecount="10">
|
||||
<div title="PipeHandling" modifier="Ichthyostega" modified="200805250303" created="200801101352" tags="spec" changecount="11">
|
||||
<pre>!Identification
|
||||
Pipes are distinct objects and can be identified by their asset ~IDs. Besides, as for all [[structural assets|StructAsset]] there are extended query capabilities, including a symbolic pipe-id and a media (stream) type id. Any pipe can accept and deliver exactly one media stream kind (which may be inherently structured though, e.g. spatial sound systems or stereoscopic video)
|
||||
|
||||
!creating pipes
|
||||
Pipe assets are created automatically by being used and referred. The [[Session]] holds a collection of global pipes, and further pipes can be created by using a new pipe reference in some placement. Moreover, every clip has an (implicit) [[source port|ClipSourcePort]], which will appear as pipe asset when first used (referred) while [[building|BuildProcess]]. Note that creating a new pipe implies using a [[processing pattern|ProcPatt]], which will be queried from the [[Defaults Manager|DefaultsManagement]] (resulting in the use of some preconfigured pattern or maybe the creation of a new ProcPatt object if necessary)
|
||||
Pipe assets are created automatically by being used and referred. The [[Session]] holds a collection of global pipes ({{red{todo: implementation missing as of 5/08}}}), and further pipes can be created by using a new pipe reference in some placement. Moreover, every clip has an (implicit) [[source port|ClipSourcePort]], which will appear as pipe asset when first used (referred) while [[building|BuildProcess]]. Note that creating a new pipe implies using a [[processing pattern|ProcPatt]], which will be queried from the [[Defaults Manager|DefaultsManagement]] (resulting in the use of some preconfigured pattern or maybe the creation of a new ProcPatt object if necessary)
|
||||
|
||||
!removal
|
||||
Deleting a Pipe is an advanced operation, because it includes finding and "detaching" all references, otherwise the pipe will leap back into existence immediately. Thus, global pipe entries in the Session and pipe references in [[locating pins|LocatingPin]] within any placement have to be removed, while clips using a given source port will be disabled. {{red{todo: implementation deferred}}}
|
||||
|
|
@ -2330,17 +2427,37 @@ there is not much you can do directly with a pipe asset. It is an point of refer
|
|||
Pipes are integrated with the [[management of defaults|DefaultsManagement]]. For example, any pipe uses implicitly some [[processing pattern|ProcPatt]] &mdash; it may default to the empty pattern. This feature enables to apply some standard wiring to the pipes (e.g a fader for audio, similar to the classic mixing consoles). This //is // a global property of the pipe, but &mdash; contrary to the stream type &mdash; this pattern may be switched
|
||||
</pre>
|
||||
</div>
|
||||
<div title="Placement" modifier="Ichthyostega" modified="200710100120" created="200706220306" tags="def" changecount="6">
|
||||
<pre>A Placement represents a //relation:// it is always linked to a //Subject// (this being a [[Media Object|MObject]]) and has the meaning to //place// this Subject in some manner, either relatively to other Media Objects, or by some Constraint or simply absolute at (time,track). The latter case is especially important and represented by a special [[Sub-Interface|ExplicitPlacement]]
|
||||
<div title="Placement" modifier="Ichthyostega" modified="200805260156" created="200706220306" tags="def" changecount="8">
|
||||
<pre>A Placement represents a //relation:// it is always linked to a //Subject// (this being a [[Media Object|MObject]]) and has the meaning to //place// this Subject in some manner, either relatively to other Media Objects, or by some Constraint or simply absolute at (time, output). The latter case is especially important for the build process and thus represented by a special [[Sub-Interface ExplicitPlacement|ExplicitPlacement]]. Besides this simple cases, Placements can also express more specific kinds of "locating" an object, like placing a sound source at a pan position or placing a video clip at a given layer (above or below another video clip)
|
||||
|
||||
So basically placements represent a query interface: you can allways ask the placement to find out about the position of the related object in terms of (time, output), and &mdash; depending on the specific object and situation &mdash; also about these additional [[placement derived dimensions|PlacementDerivedDimension]] like sound pan or layer order or similar things which also fit into the general concept of "placing" an object.
|
||||
|
||||
The fact of being placed in the [[Session|SessionOverview]]/[[EDL]]is constitutive for all sorts of [[MObject]]s, without Placement they make no sense. Thus &mdash; technically &mdash; Placements act as ''smart pointers''. Of course, there are several kinds of Placements and they are templated on the type of MObject they are refering to. Placements can be //aggregated// to increasingly constrain the resulting "location" of the refered ~MObject. See &rarr; [[handling of Placements|PlacementHandling]] for more details</pre>
|
||||
</div>
|
||||
<div title="PlacementHandling" modifier="Ichthyostega" modified="200710191414" created="200710100124" tags="design impl" changecount="11">
|
||||
<div title="PlacementDerivedDimension" modifier="Ichthyostega" modified="200805260223" created="200805260219" tags="def spec" changecount="3">
|
||||
<pre>For any [[media object|MObject]] within the session, we can allways at least query the time (reference/start) point and the output destination from the [[Placement]], by which the object is being handled. But the simple act of placing an object in some way, can &mdash; depending on the context &mdash; create additional degrees of freedom. To list some important examples:
|
||||
* placing a video clip overlapping with other clips on other tracks creates the possibility for the clip to be above another clip or to be combined in various other ways with the other clips at the same time position
|
||||
* placing a mono sound object plugged to a stereophoic output destination creates the freedom to define the pan position
|
||||
The Placement interface allows to query for these additional //parameter values derived from the fact of being placed.//
|
||||
|
||||
!defining additional dimensions
|
||||
probably a LocatingPin but... {{red{TODO any details are yet unknown as of 5/08}}}
|
||||
!querying additional dimensions
|
||||
basically you resolve the Placement, yielding an ExplicitPlacement... {{red{TODO but any details of how additional dimensions are resolved is still undefined as of 5/08}}}</pre>
|
||||
</div>
|
||||
<div title="PlacementHandling" modifier="Ichthyostega" modified="200805260212" created="200710100124" tags="design impl" changecount="13">
|
||||
<pre>[[Placement]]s are at the very core of all [[editing operations|EditingOperations]], because they act as handles (smart pointers) to access the [[media objects|MObject]] to be manipulated. Moreover, Placements are the actual content of the EDL(s) and Fixture and thus are small objects with //value semantics//. Many editing tasks include finding some Placement in the EDL or directly take a ref to some Placement. By acting on the Placement object, we can in some cases change parameters of the way the media object is placed (e.g. adjust an offset), while by dereferencing the Placement object, we access the "real" media object (e.g. for trimming its length). Placements are ''templated'' on the type of the actual ~MObject they refer to, thus defining the interface/methods usable on this object.
|
||||
|
||||
Actually, the way each Placement locates its subject is implemented by one or several small LocatingPin objects, where subclasses of LocatingPin implement the various differend methods of placing and resolving the final location. Notably, we can give a ~FixedLocation or we can atach to another ~MObject to get a ~RelativeLocation, etc.
|
||||
Actually, the way each Placement locates its subject is implemented by one or several small LocatingPin objects, where subclasses of LocatingPin implement the various different methods of placing and resolving the final location. Notably, we can give a ~FixedLocation or we can atach to another ~MObject to get a ~RelativeLocation, etc. In the typical use case, these ~LocatingPins are added to the Placement, but never retrieved directly. Rather the Placement acts as a ''query interface'' for determining the location of the related object. Here, "location" can be thought of as encompassing multiple dimenstions at the same time. An object can be
|
||||
* located at a specific point in time
|
||||
* related to and plugged into a specific output or global bus
|
||||
* defined to have a position within some [[context-dependant additional dimensions|PlacementDerivedDimension]] like
|
||||
** the pan position, either on the stereophoic base, or within a fully periphoic (spatial) sound system
|
||||
** the layer order and overlay mode for video (normal, additive, subtractive, masking)
|
||||
** the stereoscopic window position (depth parameter) for 3D video
|
||||
** channel and parameter selection for MIDI data
|
||||
|
||||
Placements have //value semantics,// i.e. we don't stress the identity of a placement object (~MObjects on the other hand //do have// a distinguishable identity): initially, you create a Placement parametrized to some specific kind (fixed, relative,...), but later on, you treat the placement polymorphically and don't care about its kind. The sole purpose of the placement's kind is to select some virtual function implementing the desired behaviour. There is no limitation to one single Placement per ~MObject, indeed we have several different Placements of the same MObject (from a users point of view, this behaves like having clones). Besides, we can ''aggregate'' additional [[LocatingPin]]a to one Placements, resulting in their properties and constraints being combined to yield the actual position of the referred ~MObject.
|
||||
Placements have //value semantics,// i.e. we don't stress the identity of a placement object (~MObjects on the other hand //do have// a distinguishable identity): initially, you create a Placement parametrized to some specific kind by adding [[LocatingPin]]s (fixed, relative,...) and possibliy you use a subclass of {{{Placement<MObject>}}} to encode additional type information, say {{{Placement<Clip>}}}, but later on, you treat the placement polymorphically and don't care about its kind. The sole purpose of the placement's kind is to select some virtual function implementing the desired behaviour. There is no limitation to one single Placement per ~MObject, indeed we can have several different Placements of the same MObject (from a users point of view, these behave like being clones). Besides, we can ''aggregate'' additional [[LocatingPin]]s to one Placements, resulting in their properties and constraints being combined to yield the actual position of the referred ~MObject.
|
||||
|
||||
!design decisions
|
||||
* the actual way of placing is implemented similar to the ''State Pattern'' by small embedded LocatingPin objects.
|
||||
|
|
@ -2513,13 +2630,12 @@ Besides, they provide an important __inward interface__ for the [[ProcNode]]s, w
|
|||
|
||||
</pre>
|
||||
</div>
|
||||
<div title="ProcLayer and Engine" modifier="Ichthyostega" modified="200804122354" created="200706190056" tags="overview" changecount="9">
|
||||
<div title="ProcLayer and Engine" modifier="Ichthyostega" modified="200805250304" created="200706190056" tags="overview" changecount="10">
|
||||
<pre>The Render Engine is the part of the application doing the actual video calculations. Its operations are guided by the Objects and Parameters edited by the user in [[the EDL|EDL]] and it retrieves the raw audio and video data from the [[Data backend|backend.html]]. Because the inner workings of the Render Engine are closely related to the structures used in the EDL, this design covers [[the aspect of objects placed into the EDL|MObjects]] as well.
|
||||
<<<
|
||||
''Status'': started out as design draft in summer '07, Ichthyo is now in the middle of a implementing the foundations and main structures in C++
|
||||
* basic AssetManager working
|
||||
* currently impmenenting the Builder (&rarr;[[more|PlanningNodeCreatorTool]])
|
||||
* intermittently working out how to deal with &rarr; [[ConfigQueries / default objects|ConfigQueryIntegration]])
|
||||
<<<
|
||||
|
||||
!Summary
|
||||
|
|
@ -2545,17 +2661,29 @@ The system is ''open'' inasmuch every part mirrors the structure of correspondin
|
|||
<pre>A data processing node within the Render Engine. Its key feature is the possibility to pull from it one (freely addressable) [[Frame]] of calculated data. Further, each ~ProcNode has the ability to be wired with other nodes and [[Parameter Providers|ParamProvider]]
|
||||
</pre>
|
||||
</div>
|
||||
<div title="ProcPatt" modifier="Ichthyostega" modified="200804102256" created="200709212315" tags="def design" changecount="5">
|
||||
<pre>This special type of [[structural Asset|StructAsset]] represents information how to build some part of the render engine's processing nodes network. It can be thought of as a template or blueprint for construction. Most notably, it is used for creating nodes reading, decoding and delivering source media material to the render network. Each [[media Asset|MediaAsset]] has associated processing patterns describing the codecs and other transformations needed to get at the media data of this asset. (and because media assets are typically compound objects, the referred ~ProcPatt will be compound too). Obviously, the possibilities opened by using processing patterns go far beyond.
|
||||
<div title="ProcPatt" modifier="Ichthyostega" modified="200805260329" created="200709212315" tags="def design" changecount="9">
|
||||
<pre>This special type of [[structural Asset|StructAsset]] represents information how to build some part of the render engine's processing nodes network. Processing patterns can be thought of as a blueprint or micro program for construction. Most notably, they are used for creating nodes reading, decoding and delivering source media material to the render network, and they are used for building the output connection via faders, summation or overlay nodes to the global pipes (busses). Each [[media Asset|MediaAsset]] has associated processing patterns describing the codecs and other transformations needed to get at the media data of this asset. (and because media assets are typically compound objects, the referred ~ProcPatt will be compound too). Similarily, for each stream kind, we can retrieve a processing pattern for making output connections. Obviously, the possibilities opened by using processing patterns go far beyond.
|
||||
|
||||
Technically, a processing pattern is a list of building instructions, which will be //executed// by the [[Builder]] on the render node network under construction. This implies the possibility to define further instruction kinds when needed in future; at the moment the relevant sorts of instructions are
|
||||
* attach the given sequence of nodes to the specified point
|
||||
* recursively execute a nested ~ProcPatt
|
||||
More specifically, a sequence of nodes is given by a sequence of prototypical effect and codec assets (and from each of them we can create the corresponding render node). And the point to attach these nodes is given by an identifier &mdash; in most cases just "{{{current}}}", denoting the point the builder was just working at, when he treated some MObject which in turn yielded this processing pattern in question.
|
||||
More specifically, a sequence of nodes is given by a sequence of prototypical effect and codec assets (and from each of them we can create the corresponding render node). And the point to attach these nodes is given by an identifier &mdash; in most cases just "{{{current}}}", denoting the point the builder is currently working at, when treating some placed ~MObject which in turn yielded this processing pattern in question.
|
||||
|
||||
Like all [[structural assets|StructAsset]], ~ProcPatt employs a special naming scheme within the asset name field, which directly mirrors its purpose and allows to bind to existing processing pattern instances when needed. The idea is letting all assets in need of a similar processing pattern refer to one shared ~ProcPatt instance. For example, within a MPEG video media asset, at some point there will be a ~ProcPatt labeled "{{{stream(mpeg)}}}". In consequence, all MPEG video will use the same pattern of node wiring. And, of course, this pattern could be changed, either globally, or by binding a single clip to some other processing pattern (for making a punctual exception from the general rule)
|
||||
Like all [[structural assets|StructAsset]], ~ProcPatt employs a special naming scheme within the asset name field, which directly mirrors its purpose and allows to bind to existing processing pattern instances when needed. {{red{TODO: that's just the general idea, but really it will rather use some sort of tags. Yet undefined as of 5/08}}} The idea is letting all assets in need of a similar processing pattern refer to one shared ~ProcPatt instance. For example, within a MPEG video media asset, at some point there will be a ~ProcPatt labeled "{{{stream(mpeg)}}}". In consequence, all MPEG video will use the same pattern of node wiring. And, of course, this pattern could be changed, either globally, or by binding a single clip to some other processing pattern (for making a punctual exception from the general rule)
|
||||
|
||||
!!defining Processing Patterns
|
||||
The basic working set of processing patterns can be expected to be just there (hard wired or default configuration, mechanism for creating an sensible fallback). Besides, the idea is that new processing patterns can be added via rules in the session and then referred to by other rules controlling the build process. Any processing pattern is assembled by adding individual build instructions, or by including another (nested) processing pattern.
|
||||
|
||||
!!retrieving a suitable Processing Pattern
|
||||
For a given situation, the necessary ProcPatt can be retrieved by issuing a [[configuration query|ConfigQuery]]. This query should include the needed capabilities in predicate form (technically this query is a Prolog goal), but it can leave out informations by just requesting "the default" &rarr; see DefaultsManagement
|
||||
|
||||
!!how does this actually work?
|
||||
Any processing pattern needs the help of a passive holder tool suited for a specific [[building situation|BuilderPrimitives]]; we call these holder tools [[building moulds|BuilderMould]]. Depending on the situation, the mould has been armed up by the builder with the involved objects to be connected and extended. So, just by issuing the //location ID// defined within the individual build instruction (in most cases simply {{{"current"}}}), the processing pattern can retrieve the actual render object to use for building from the mould it is executed in.
|
||||
|
||||
!!errors and misconfiguration
|
||||
Viewed as a micro program, the processing patterns are ''weak typed'' &mdash; thus providing the necessary flexibility within an otherwise strong typed system. Consequently, the builder assumes they are configured //the right way// &mdash; and will just bail out when this isn't the case, marking the related part of the high-level model as erroneous.
|
||||
&rarr; see BuilderErrorHandling for details
|
||||
|
||||
//Note,// nothing has been said about how processing patterns are defined. One can expect for some //default patterns// beeing defined somewhere in the application, any session could overrule these defaults, and when there is no default, we can expect some mechanism deriving sensible fallback patterns //for every specific use case// of processing patterns. See the problem of [[Loading Media]] as an example.
|
||||
</pre>
|
||||
</div>
|
||||
<div title="Processors" modifier="Ichthyostega" created="200706220412" tags="def" changecount="1">
|
||||
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|
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