Sustainability of Digital Formats
Planning for Library of Congress Collections
Sustainability of Digital Formats
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| Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact | |
| Full name | Windows Media Audio File with Windows Media 9 Lossless Codec |
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| Description | File format based in ASF (Advanced Systems Format) that wraps a Windows Media 9 lossless audio bitstream. |
| Production phase | Used for middle-state purposes, e.g., archiving of high-quality files. |
| Relationship to other formats | |
| Subtype of | WMA, (Windows Media Audio) |
| Contains | WMA9_LL, audio codec |
| LC experience or existing holdings | |
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| LC preference | See WMA |
| Disclosure | See WMA and ASF |
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| Documentation | See WMA and ASF |
| Adoption | Not known to the compilers of this document; the WMA file format is widely adopted. The lossless codec is specialized and may not see wide adoption. |
| Licensing and patents | See ASF for link to pages covering licensing of Windows Media and the Advanced Systems Format. |
| Transparency | Depends upon algorithms and tools to read; will require sophistication to build tools. |
| Self-documentation | See ASF |
| External dependencies | See WMA |
| Technical protection considerations | See ASF |
| Sound | |
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| Normal rendering | Good support. |
| Fidelity (high audio resolution) | See WMA9_LL (audio codec). |
| Multiple channels | See WMA9_LL (audio codec). |
| Functionality beyond normal rendering | None |
| Tag | Value | Note |
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| Filename extension | wma |
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| Internet Media Type | See note. |
See WMA |
| Magic numbers | See note. |
See WMA |
| ASF GUID | See note. |
See WMA |
| General | |
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| History |
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