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Today's Internet is accessible to diverse end devices
through a wide variety of network types. To react to
this diversity of usage contexts new media codecs
include adaptation support in the codec design.
Scalable media codecs enable to easily retrieve
different qualities of the media content by simply
disregarding certain media segments. The MPEG-21
Digital Item Adaptation (DIA) standard enables
codec-agnostic adaptation by specifying a set of
descriptions in order to describe content, adaptation
possibilities and usage context in the XML domain.
This book extends the DIA approach towards dynamic
and distributed environments. To achieve this, novel
mechanisms for fragmentation, storage and transport
of XML metadata are introduced. Additionally, a
mechanism based on a novel binary header to enable
codec-agnostic adaptation is specified. This Generic
Scalability Header (GSH) enables codec-agnostic
adaptation at a considerably lower performance cost
compared to the DIA approach. An adaptation node
based on these novel mechanisms is implemented and
evaluated for several types of scalable media. A
concluding discussion analyzes the results of the
evaluation of both mechanisms.
through a wide variety of network types. To react to
this diversity of usage contexts new media codecs
include adaptation support in the codec design.
Scalable media codecs enable to easily retrieve
different qualities of the media content by simply
disregarding certain media segments. The MPEG-21
Digital Item Adaptation (DIA) standard enables
codec-agnostic adaptation by specifying a set of
descriptions in order to describe content, adaptation
possibilities and usage context in the XML domain.
This book extends the DIA approach towards dynamic
and distributed environments. To achieve this, novel
mechanisms for fragmentation, storage and transport
of XML metadata are introduced. Additionally, a
mechanism based on a novel binary header to enable
codec-agnostic adaptation is specified. This Generic
Scalability Header (GSH) enables codec-agnostic
adaptation at a considerably lower performance cost
compared to the DIA approach. An adaptation node
based on these novel mechanisms is implemented and
evaluated for several types of scalable media. A
concluding discussion analyzes the results of the
evaluation of both mechanisms.