streamtype.hpp

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/*
  STREAMTYPE.hpp  -  classification of media stream types
 
   Copyright (C)
     2008,            Hermann Vosseler <Ichthyostega@web.de>
 
 **Lumiera** is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by the
 Free Software Foundation; either version 2 of the License, or (at your
 option) any later version. See the file COPYING for further details.
 
*/
 
#ifndef STEAM_STREAMTYPE_H
#define STEAM_STREAMTYPE_H
 
#include "lib/symbol.hpp"
//#include "common/query.hpp"
#include "lib/idi/entry-id.hpp"
 
 
 
namespace steam {
  
  using lib::Symbol;
 
// "yes mummy, we all know this code is not finished yet..."
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wuninitialized"
  
  struct StreamType
    : util::NonCopyable
    {
      enum MediaKind
        {
          VIDEO,
          IMMAGE,
          AUDIO,
          MIDI
        };
      
      enum Usage
        {
          RAW,
          SOURCE,
          TARGET,
          TRANSIENT
        };
      
      struct Prototype;
      
      class ImplFacade;
      class ImplConstraint;
      
      using ID = lib::idi::EntryID<StreamType>;
      
      
      Prototype const& prototype;
      ImplFacade * implType;       
      Usage intentionTag;
      
    };
#pragma GCC diagnostic pop
  
  
  struct StreamType::Prototype
    {
      Symbol id;
      MediaKind kind;
      
      bool subsumes (Prototype const& other)  const;
      bool canRender (Prototype const& other)  const;
    };
  
  
  
  
  class StreamType::ImplFacade
    {
    public:
      Symbol libraryID;
      
      class TypeTag ;
      
      struct DataBuffer { };
      
      
      virtual bool operator== (ImplFacade const& other)  const =0;
      virtual bool operator== (StreamType const& other)  const =0;
      
      virtual bool canConvert (ImplFacade const& other)  const =0;
      virtual bool canConvert (StreamType const& other)  const =0;
      
      virtual DataBuffer* createFrame ()  const =0;
      virtual MediaKind getKind()         const =0;
      
      virtual ~ImplFacade() {};
      
    protected:
      ImplFacade (Symbol libID) ;
    };
  
  
  class StreamType::ImplConstraint
    : public StreamType::ImplFacade
    {
    public:
      virtual bool canConvert (ImplFacade const& other)  const =0;
      virtual bool canConvert (StreamType const& other)  const =0;
      
      virtual bool subsumes (ImplFacade const& other)  const   =0;
      
      virtual void makeCompliant (ImplFacade & other)  const   =0;
      
      virtual DataBuffer* createFrame ()  const =0;
      
      virtual DataBuffer* createFrame (ImplConstraint const& furtherConstraints)  const =0;
      
      //TODO: do we need functions to represent and describe this constraint?
      
    };
  
  
  class StreamType::ImplFacade::TypeTag
    {
      void* rawTypeStruct_;
      
    public:
      Symbol libraryID;
      
      template<class TY>
      TypeTag (Symbol lID, TY& rawType)
        : rawTypeStruct_(&rawType),
          libraryID(lID)
        { }
    };
  
  
  
  
} // namespace steam
 
 
namespace lumiera {
  using steam::StreamType;
}
 
#endif /*STEAM_STREAMTYPE_H*/