bslbf uimsbf

uimsbf: unsigned integer, most significant bit first

bslbf: bit string, left bit first

对这两个描述，不太清楚作用是什么？

参考文档：

bslbf: 

bit string, left bit first. "Left" is the order in which bit strings are written and are shown as a string of 1s and 0s within single quote marks. When there are blanks within the quote marks, these are merely for ease of reading and have no significance This is the mnemonic used in MPEG-2 private table sections to represent 'not-quite-numeric' values such as boolean fields, pointers and variable-length fields such asdata_byte. For numeric values the uimsbf mnemonic is generally used.

http://www.etherguidesystems.com/help/sdos/mpeg/semantics/mpeg-2/bslbf.aspx

uimsbf: 

An unsigned integer, transmitted most significant bit first This is the mnemonic used in MPEG-2 private table sections to transmit numbers represented by 8 or more bits.

http://www.etherguidesystems.com/help/sdos/mpeg/semantics/mpeg-2/uimsbf.aspx

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