OGRE  1.12.4
Object-Oriented Graphics Rendering Engine
Ogre::Codec Class Referenceabstract

Abstract class that defines a 'codec'. More...

#include <OgreCodec.h>

+ Inheritance diagram for Ogre::Codec:

Classes

class  CodecData
 

Public Types

typedef SharedPtr< CodecDataCodecDataPtr
 
typedef ConstMapIterator< CodecList > CodecIterator
 
typedef std::pair< MemoryDataStreamPtr, CodecDataPtrDecodeResult
 Result of a decoding; both a decoded data stream and CodecData metadata. More...
 

Public Member Functions

virtual ~Codec ()
 
virtual DecodeResult decode (const DataStreamPtr &input) const =0
 Codes the data from the input chunk into the output chunk. More...
 
virtual DataStreamPtr encode (const MemoryDataStreamPtr &input, const CodecDataPtr &pData) const =0
 Codes the data in the input stream and saves the result in the output stream. More...
 
virtual void encodeToFile (const MemoryDataStreamPtr &input, const String &outFileName, const CodecDataPtr &pData) const =0
 Codes the data in the input chunk and saves the result in the output filename provided. More...
 
virtual String getDataType () const =0
 Returns the type of the data that supported by this codec as a String. More...
 
virtual String getType () const =0
 Returns the type of the codec as a String. More...
 
virtual bool magicNumberMatch (const char *magicNumberPtr, size_t maxbytes) const
 Returns whether a magic number header matches this codec. More...
 
virtual String magicNumberToFileExt (const char *magicNumberPtr, size_t maxbytes) const =0
 Maps a magic number header to a file extension, if this codec recognises it. More...
 

Static Public Member Functions

static CodecgetCodec (const String &extension)
 Gets the codec registered for the passed in file extension. More...
 
static CodecgetCodec (char *magicNumberPtr, size_t maxbytes)
 Gets the codec that can handle the given 'magic' identifier. More...
 
static CodecIterator getCodecIterator (void)
 Gets the iterator for the registered codecs. More...
 
static StringVector getExtensions (void)
 Gets the file extension list for the registered codecs. More...
 
static bool isCodecRegistered (const String &codecType)
 Return whether a codec is registered already. More...
 
static void registerCodec (Codec *pCodec)
 Registers a new codec in the database. More...
 
static void unregisterCodec (Codec *pCodec)
 Unregisters a codec from the database. More...
 

Detailed Description

Abstract class that defines a 'codec'.

Remarks
A codec class works like a two-way filter for data - data entered on one end (the decode end) gets processed and transformed into easily usable data while data passed the other way around codes it back.
The codec concept is a pretty generic one - you can easily understand how it can be used for images, sounds, archives, even compressed data.

Member Typedef Documentation

◆ CodecDataPtr

◆ CodecIterator

◆ DecodeResult

Result of a decoding; both a decoded data stream and CodecData metadata.

Constructor & Destructor Documentation

◆ ~Codec()

virtual Ogre::Codec::~Codec ( )
virtual

Member Function Documentation

◆ registerCodec()

static void Ogre::Codec::registerCodec ( Codec pCodec)
inlinestatic

Registers a new codec in the database.

References Ogre::Exception::ERR_DUPLICATE_ITEM, getType(), and OGRE_EXCEPT.

◆ isCodecRegistered()

static bool Ogre::Codec::isCodecRegistered ( const String codecType)
inlinestatic

Return whether a codec is registered already.

◆ unregisterCodec()

static void Ogre::Codec::unregisterCodec ( Codec pCodec)
inlinestatic

Unregisters a codec from the database.

References getType().

◆ getCodecIterator()

static CodecIterator Ogre::Codec::getCodecIterator ( void  )
inlinestatic

Gets the iterator for the registered codecs.

◆ getExtensions()

static StringVector Ogre::Codec::getExtensions ( void  )
static

Gets the file extension list for the registered codecs.

◆ getCodec() [1/2]

static Codec* Ogre::Codec::getCodec ( const String extension)
static

Gets the codec registered for the passed in file extension.

◆ getCodec() [2/2]

static Codec* Ogre::Codec::getCodec ( char *  magicNumberPtr,
size_t  maxbytes 
)
static

Gets the codec that can handle the given 'magic' identifier.

Parameters
magicNumberPtrPointer to a stream of bytes which should identify the file. Note that this may be more than needed - each codec may be looking for a different size magic number.
maxbytesThe number of bytes passed

◆ encode()

virtual DataStreamPtr Ogre::Codec::encode ( const MemoryDataStreamPtr input,
const CodecDataPtr pData 
) const
pure virtual

Codes the data in the input stream and saves the result in the output stream.

Implemented in Ogre::DDSCodec, Ogre::FreeImageCodec, Ogre::ETCCodec, Ogre::ASTCCodec, Ogre::PVRTCCodec, Ogre::STBIImageCodec, and Ogre::EXRCodec.

◆ encodeToFile()

virtual void Ogre::Codec::encodeToFile ( const MemoryDataStreamPtr input,
const String outFileName,
const CodecDataPtr pData 
) const
pure virtual

Codes the data in the input chunk and saves the result in the output filename provided.

Provided for efficiency since coding to memory is progressive therefore memory required is unknown leading to reallocations.

Parameters
inputThe input data
outFileNameThe filename to write to
pDataExtra information to be passed to the codec (codec type specific)

Implemented in Ogre::DDSCodec, Ogre::FreeImageCodec, Ogre::ETCCodec, Ogre::ASTCCodec, Ogre::PVRTCCodec, Ogre::STBIImageCodec, and Ogre::EXRCodec.

◆ decode()

virtual DecodeResult Ogre::Codec::decode ( const DataStreamPtr input) const
pure virtual

Codes the data from the input chunk into the output chunk.

Parameters
inputStream containing the encoded data

Implemented in Ogre::DDSCodec, Ogre::FreeImageCodec, Ogre::ETCCodec, Ogre::ASTCCodec, Ogre::PVRTCCodec, Ogre::STBIImageCodec, and Ogre::EXRCodec.

◆ getType()

virtual String Ogre::Codec::getType ( ) const
pure virtual

Returns the type of the codec as a String.

Implemented in Ogre::DDSCodec, Ogre::FreeImageCodec, Ogre::ETCCodec, Ogre::ASTCCodec, Ogre::PVRTCCodec, Ogre::STBIImageCodec, and Ogre::EXRCodec.

Referenced by registerCodec(), and unregisterCodec().

◆ getDataType()

virtual String Ogre::Codec::getDataType ( ) const
pure virtual

Returns the type of the data that supported by this codec as a String.

Implemented in Ogre::ImageCodec.

◆ magicNumberMatch()

virtual bool Ogre::Codec::magicNumberMatch ( const char *  magicNumberPtr,
size_t  maxbytes 
) const
inlinevirtual

Returns whether a magic number header matches this codec.

Parameters
magicNumberPtrPointer to a stream of bytes which should identify the file. Note that this may be more than needed - each codec may be looking for a different size magic number.
maxbytesThe number of bytes passed

◆ magicNumberToFileExt()

virtual String Ogre::Codec::magicNumberToFileExt ( const char *  magicNumberPtr,
size_t  maxbytes 
) const
pure virtual

Maps a magic number header to a file extension, if this codec recognises it.

Parameters
magicNumberPtrPointer to a stream of bytes which should identify the file. Note that this may be more than needed - each codec may be looking for a different size magic number.
maxbytesThe number of bytes passed
Returns
A blank string if the magic number was unknown, or a file extension.

Implemented in Ogre::DDSCodec, Ogre::FreeImageCodec, Ogre::ETCCodec, Ogre::ASTCCodec, Ogre::PVRTCCodec, Ogre::STBIImageCodec, and Ogre::EXRCodec.


The documentation for this class was generated from the following file: