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Advanced Streaming Format (ASF). By Hung-Chin Wang. What is ASF ?. An extensible file format be composed of one or more media streams include specification of some commonly used media types support the transmission of “ live content ” over a wide variety of network and protocols.

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What is asf l.jpg
What is ASF ?

  • An extensible file format

  • be composed of one or more media streams

  • include specification of some commonly used media types

  • support the transmission of “ live content ”

  • over a wide variety of network and protocols


Asf features 1 l.jpg
ASF Features (1)

  • Extensible Media Types

    • easy to define new media types

  • Component Download

    • Stream-specific information in the file header

  • Scalable Media Types

    • provide information for clients to interpret scalability options


Asf features 2 l.jpg
ASF Features (2)

  • Multiple Languages

    • support multiple languages

  • Author-specified Stream Prioritization

  • Bibliographic Information


File format organization 1 l.jpg
File Format Organization(1)

  • ASF Object definition

    • the base unit of organization - ASF Object

    • store in little-endian byte order


File format organization 2 l.jpg
File Format Organization(2)

  • High-level File Structure

    • three top-level objects

      • Header Object

      • Data Object

      • Index Object


File format organization 3 l.jpg
File Format Organization(3)

  • ASF Header Object

    • File Properties Object

    • Stream Properties Object

    • Language List Object

    • Content Description Object

    • Maker Object

    • Index Parameters Object

    • …………


File format organization 4 l.jpg
File Format Organization(4)

  • ASF Data Object

    • data units ( contain all multimedia data )

  • ASF Index Object

  • Example





Standard asf media types l.jpg
Standard ASF Media Types

  • Audio Media Type

  • Video Media Type

  • Image Media Type

  • Timecode Media Type

  • Text Media Type

  • MIDI Media Type

  • Command Media Type

  • Media-Objects(Hotspot) Media Type


Index parameters object l.jpg
Index Parameters Object

  • Index Type

    • Nearest Data Unit

    • Nearest Object

    • Nearest Clean Point






Other asf header subobjects l.jpg
Other ASF Header SubObjects

  • Component Download Object

  • Stream Group Object

  • Scalable Object

  • Mutual Exclusion Object

  • ……...


Conclusion l.jpg
Conclusion

  • 如何將 media file 轉變成 asf 的檔案格式


Thanks l.jpg
Thanks

  • Everyone


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