130 lines
3.4 KiB
C++
130 lines
3.4 KiB
C++
/*
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PROC.hpp - key abstraction: data-processing assets
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Copyright (C) Lumiera.org
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2008, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file proc.hpp
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** Data processing Plugins and Codecs can be treated as a specific Kind of Asset.
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** For the different <i>Kinds</i> of Assets, we use sub-interfaces inheriting
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** from the general Asset interface. To be able to get asset::Proc instances
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** directly from the AssetManager, we define a specialisation of the Asset ID.
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**
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** @see asset.hpp for explanation
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** @see ProcFactory creating concrete asset::Proc instances
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**
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*/
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#ifndef ASSET_PROC_H
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#define ASSET_PROC_H
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#include "pre_a.hpp"
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#include "proc/asset.hpp"
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#include "lib/factory.hpp"
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#include "lib/streamtype.hpp"
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namespace asset {
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class Proc;
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class ProcFactory;
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typedef P<const Proc> PProc;
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template<>
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class ID<Proc> : public ID<Asset>
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{
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public:
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ID (size_t id);
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ID (const Proc&);
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};
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/**
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* key abstraction: data processing asset
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* @todo just a stub, have to figure out what a asset::Proc is
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*/
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class Proc : public Asset
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{
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public:
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static ProcFactory create;
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virtual const ID<Proc>& getID() const ///< @return ID of kind Proc
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{
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return static_cast<const ID<Proc>& > (Asset::getID());
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}
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typedef lumiera::StreamType::ImplFacade::DataBuffer Buff;
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typedef Buff* PBuff;
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typedef void (ProcFunc) (PBuff);
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/** resolve any plugin and configuration info
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* to yield the actual media data processing function.
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* @return a function ready to be invoked; either the
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* "real thing" or a suitable placeholder.
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* @throw lumiera::error::Fatal if unable to provide
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* any usable function or placeholder. This case
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* can be considered exceptional and justifies a
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* subsystem failure.
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*/
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virtual ProcFunc*
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resolveProcessor() const =0;
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protected:
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Proc (const Asset::Ident& idi) : Asset(idi) {} //////////////TODO
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friend class ProcFactory;
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};
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// definition of ID<Proc> ctors is possible now,
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// after providing full definition of class Proc
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inline ID<Proc>::ID(size_t id) : ID<Asset> (id) {};
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inline ID<Proc>::ID(const Proc& proc) : ID<Asset> (proc.getID()) {};
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/**
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* Factory specialised for creating Processor Asset objects.
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*/
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class ProcFactory : public lib::Factory<asset::Proc>
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{
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public:
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typedef P<asset::Proc> PType;
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PType operator() (Asset::Ident& key); ////////////TODO define actual operation
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};
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} // namespace asset
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#endif
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