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/* -----------------------------------------------------------------
GEM - Graphics Environment for Multimedia
Load an digital video (like AVI, Mpeg, Quicktime) into a pix block
(OS independant parent-class)
Copyright (c) 1997-1999 Mark Danks. mark@danks.org
Copyright (c) Günther Geiger. geiger@epy.co.at
Copyright (c) 2001-2011 IOhannes m zmölnig. forum::für::umläute. IEM. zmoelnig@iem.at
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "GEM.LICENSE.TERMS" in this distribution.
-----------------------------------------------------------------*/
#ifndef _INCLUDE__GEM_PLUGINS_FILM_H_
#define _INCLUDE__GEM_PLUGINS_FILM_H_
#include "Gem/ExportDef.h"
#include "Gem/GemGL.h"
#include <string>
/*-----------------------------------------------------------------
-------------------------------------------------------------------
CLASS
film
parent class for the system- and library-dependent film-loader classes
KEYWORDS
pix film movie
DESCRIPTION
-----------------------------------------------------------------*/
class pixBlock;
namespace gem {
class Properties;
}
namespace gem { namespace plugins {
class GEM_EXTERN film
{
public:
//////////
// returns an instance wrapping all plugins or NULL
// if NULL is returned, you might still try your luck with manually accessing the
// PluginFactory
static film*getInstance(void);
/////////
// dtor must be virtual
virtual ~film(void);
//////////
// open a movie up
/* open the film "filename" (think better about URIs ?)
*
* try to open the film with the requested properties
*
* about properties:
* requestprops: are properties that can change the behaviour of how the
* film is opened; examples are "colorspace" (e.g. GL_RGBA) or
* "streaming" (rather than random frame access)
* the backend need not implement any of the properties
*
* resultprops: give feedback about the opened film
* if the film could not be opened, the content is undefined
* if the film was successfully opened, following properties should be set
* if a property can not be determined (e.g. variable fps), it should be set unset
*
*
* discussion: should the colourspace be only a hint or should we force it
* (evt. by converting the actual cs by hand to the desired one)
* more discussion: i guess the cs should really be forced somehow by [pix_film]
* now i don't know, whether the cs-conversion should be done by [pix_film] itself or
* rather by the film*-classes.
* but i guess film* makes more sense, because then, [pix_film] doesn't have to know
* anything about the internal cs of the decoder
*/
/* returns TRUE if loading was successfull, FALSE otherwise */
virtual bool open(const std::string,
const gem::Properties&requestprops) = 0;
/* some error codes */
enum errCode { SUCCESS = 0,
FAILURE = 1,
DONTKNOW= 2 };
//////////
// Change which image to display
/* this is the second core function of this class:
* most decoding-libraries can set the frame-number on a random-access basis.
* some cannot, then this might do nothing
* you could also switch between various tracks of a file (if the format supports it)
* specifying trackNum as -1 means "same track as before"
*/
virtual errCode changeImage(int imgNum, int trackNum=-1) = 0;
//////////
// get the next frame
/* this is the core-function of this class !!!!
* when called it returns the current frame in the *pixBlock structure
* dev: you can use "m_image" for this (and "return &m_image;")
* if the image cannot be read, returns 0
* dev: you probably want to set the whole meta-information
* (xsize,ysize,csize,format) over again
* if you are smart and the colour-space is fine, just point
* if this is a "new" frame (e.g. freshly decoded),
* pixblock.newimage should be set to 1
*/
virtual pixBlock* getFrame(void) = 0;
//////////
// close the movie file
/* close the file and clean up temporary things */
virtual void close(void) = 0;
////////
// returns true if instance can be used in thread
virtual bool isThreadable(void) = 0;
/**
* list all properties the currently opened film supports
* if no film is opened, this returns generic backend properties
* which can be different from media specific properties
* after calling, "readable" will hold a list of all properties that can be read
* and "writeable" will hold a list of all properties that can be set
* if the enumeration fails, this returns <code>false</code>
*/
virtual bool enumProperties(gem::Properties&readable,
gem::Properties&writeable) = 0;
/**
* set a number of properties (as defined by "props")
* the "props" may hold properties not supported by the currently opened media,
* which is legal; in this case the superfluous properties are simply ignored
* this function MAY modify the props;
* namely one-shot properties should be removed from the props
*
* examples: "colorspace" GL_RGBA
* "auto" 1
*/
virtual void setProperties(gem::Properties&props) = 0;
/**
* get the current value of the given properties from the media
* if props holds properties that can not be read for the media, they are set to UNSET
*
* "width" (width of each frame in pixels)
* "height" (height of each frame in pixels)
* "fps" (frames per second)
* "frames" (framecount)
*/
virtual void getProperties(gem::Properties&props) = 0;
};
};}; // namespace gem::plugins
/**
* \fn REGISTER_FILMFACTORY(const char *id, Class filmClass)
* registers a new class "filmClass" with the film-factory
*
* \param id a symbolic (const char*) ID for the given class
* \param filmClass a class derived from "film"
*/
#define REGISTER_FILMFACTORY(id, TYP) static gem::PluginFactoryRegistrar::registrar<TYP, gem::plugins::film> fac_film_ ## TYP (id)
#endif // for header file
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