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Flexible interchange of coded multimedia facilitating access and streaming
| Details |
Inventors: Basso, Andrea; Eleftheriadis, Alexandros; Kalva, Hari; Puri, Atul; Schmidt, Robert Lewis;
Assignee: AT&T Corp. (New York, NY); The Trustees of Columbia University (New York, NY)
Primary Examiner: Vu; Kim
Assistant Examiner: Pham; Hung
Attorney, Agent or Firm:
A fundamental limitation in the exchange of audiovisual information today is that its representation is extremely low level. It is composed of coded video or audio samples (often as blocks) arranged in a commercial format. In contrast, the new generation multimedia requires flexible formats to allow a quick adaptation to requirements in terms of access, bandwidth scalability, streaming as well as general data reorganization. The Flexible-Integrated Intermedia Format (Flexible-IIF or F-IIF) is an advanced extension to the Integrated Intermedia Format (IIF). The Flexible-Integrated Intermedia Format (Flexible-IIF) datastructures, file formats systems and methods provide a framework that integrates advanced concepts, such as objects based audio-visual representation, meta-data and object oriented programming, to achieve a flexible and generic representation of the audiovisual information and the associated methods to operate on the audiovisual information. |
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DETAILED DESCRIPTION The data structures, file formats, systems and methods of this invention provide enhanced audiovisual coding and storage techniques, related to MPEG-4, by introducing enhanced formatting including an expanded physical object table which utilizes an "ordered" list of unique identifiers for a particular object for every object instance.
Therefore, using the invention, two object instances of the same object in the same segment can be separately identified.
Thus, among other advantages, different instances of the identical object may be differentiated from one another.
The term "ordered" herein denotes that all access layer data (AL PDUs) of the same object instance are placed in the file in their natural order of occurrence, or coding order.
An additional benefit of the invention is that a given object instance can change its local identifier in time and still be randomly accessed by means of an improved physical object table/segment object table (POT)/(SOT) mechanism.
The invention in one aspect relates to a method of composing data in a file, and a medium for storing that file, the file including a file header containing physical object information and logical object information, and generating a sequence of audiovisual segments, each including a plurality of audiovisual objects.
The physical object information and the physical object information contains pointers to access the audiovisual segments.
In another aspect the invention provides a corresponding method of extracting data from a file, including by accessing a file having a header which contains physical object information and logical object information, and accessing audiovisual segments contained therein.
In another aspect the invention provides a system for processing a data file including a processor unit and a storage unit connected to the processor unit, the storage unit storing a file including a file header and a sequence of audiovisual segments.
The file header contains physical object information and logical object information, and the physical object information contains pointers to access the audiovisual segments
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File Sharing 
