96 lines
4.5 KiB
Text
96 lines
4.5 KiB
Text
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JPEG XR Device Porting Kit v1.0 - April 2013
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JPEG XR
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-------
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This device porting kit (DPK) supports the JPEG XR still image format, based on
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technology originally developed by Mirosoft under the name HD Photo (formerly
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Windows Media<69> Photo). The JPEG XR format is similar, but not identical, to the
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HD Photo/Windows Media<69> Photo format.
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The JPEG XR format replaces the HD Photo/Windows Media<69> Photo format in both
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Windows 8 and the Windows Image Component (WIC). WIC accompanies the Internet
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Explorer 10 redistributable packages for down-level versions of Windows.
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Some <20>Windows Media<69> Photo<74> (WMP) naming conventions are still used internally
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with this release of the DPK.
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JPEG XR files use the .jxr extension. Applications that support the JPEG XR
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file format should recognize and decode HD Photo/Windows Media<69> Photo
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.hdp/.wdp files, but only offer to create files with the .jxr extension.
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Device Porting Kit Contents
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---------------------------
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This device porting kit contains documentation, reference source code, sample
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applications and utilities for the evaluation and implementation of the JPEG XR
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file format and compression technology.
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Assuming the installation dir is C:\jxrlib, all the paths mentioned below are
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relative to this base path.
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The Visual Studio 2010 main solution is:
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jxrencoderdecoder\JXR.sln
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The Visual Studio 2012 main solution is:
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jxrencoderdecoder\JXR_vc11.sln
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Build JXR.sln Debug Configuration, you will get:
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jxrencoderdecoder\Debug\JXRDecApp\JXRDecApp.exe
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jxrencoderdecoder\Debug\JXREncApp\JXREncApp.exe
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The main directory contains a Unix/Linux compatible make file for building the
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encoder and decoder, including support for big endian or little endian processor
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architecture. It is the developer's responsibility to properly organize all the
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source files according to the paths defined in this make file for its correct
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operation. This is provided as a convenience for cross-platform developers and
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to demonstrate the correct operation of the encoder and decoder on big endian
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systems.
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The JPEG XR Image Coding Spectification provides a detailed specification of the
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compression encoder and decoder algorithms plus the detailed structure of the
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compressed data (elementary) bit stream. This document is designed to be used in
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conjunction with the included source code. If you find instances where the code
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differs from the documentation, the code implementation should be used as the
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reference.
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The JPEG XR Image Coding Spectification is an international standard and is
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available at: http://www.itu.int/rec/T-REC-T.832 while the reference software is
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available at: http://www.itu.int/rec/T-REC-T.835.
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"JPEGXR_DPK_1.0.doc" documents the contents of this porting kit, the usage of
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the command line file conversion utilities (JXREncApp.exe and JXRDecApp.exe), and
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technical details of the API's and data structures between these sample command
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line applications and the core codec.
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The code and documentation in this release represent the final design and
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specification of the 1.0 bit stream, and can be used as the reference for final
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implementations of encoders and decoders for JPEG XR.
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This release of the DPK has received extensive testing of all the various pixel
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formats, encoder options and modes of operation. We are confident that most errors
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and other bugs have been resolved. Any code bugs, documentation errors or other
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discrepancies found in this release candidate should be reported to Microsoft as
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promptly as possible. These can be submitted to hdview@microsoft.com.
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This DPK provides basic support for big endian architectures. We have
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successfully tested the encoder and decoder using a big endian processor. This
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support is provided as a starting reference to be adapted to the specific
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platform and hardware architecture of the target system.
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Contact Information
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-------------------
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For any and all technical questions or feedback about any part of this Device
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Porting Kit, including the documentation, please send email to:
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hdview@microsoft.com
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We will respond as promptly as possible with answers to your questions.
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Additional information, best practices, tools, utilities, sample code, sample
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image content, links to additional resources and community discussion can
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currently be found at http://hdview.wordpress.com/.
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- The Microsoft JPEG XR Development Team
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---------------------------------------------------------------------------------
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