WMA文件格式和解码流程
2014-10-12 17:36
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1 文件格式(ASF)
ASF:Advanced Systems Format (formerly Advanced Streaming Format, Active Streaming Format) is Microsoft's proprietary digital audio/digital video container format, especially meant for streaming media. ASF is part of the Windows Media framework.—from google
define
Object format
1.1 Header Object(objects can apper in any order)
1.2 Data Object
Data Packet’s length is fixed. Data Packets are devided based on the time.
1.3 Index Object(skiped)
2 解码原理及流程
3 附录
http://ffmpeg.org/
ASF:Advanced Systems Format (formerly Advanced Streaming Format, Active Streaming Format) is Microsoft's proprietary digital audio/digital video container format, especially meant for streaming media. ASF is part of the Windows Media framework.—from google
define
Header Object | Required |
Data Object | Required |
Index Object | Optional |
Object GUID | 16 Bytes |
Object Size | 8 Bytes(the value is 24 + Object Data Size) |
Object Data | (Object Size – 24)Bytes |
File Properties(Required) |
Header Extention(Required) |
Stream Properties(At least one stream properties object) |
…… |
Stream Properties |
Other header Object(optional) |
Data Packet 0 |
Data Packet 1 |
…… |
Data Packet N |
1.3 Index Object(skiped)
2 解码原理及流程
3 附录
http://ffmpeg.org/
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