2.2.2.2.2 Buffer Size Attribute (a=bufsize)

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The bufsize attribute is defined for use at the SDP media level. It specifies the buffer window that corresponds to the bit rate specified in the b=AS attribute defined in section 5.8 of [RFC4566] when the b=AS field is present at the SDP media level.

If there is no b=AS field at the SDP media level, then the meaning of the bufsize attribute is undefined.

The syntax of the attribute is defined as follows.

  
 bufsize = "a=bufsize:AS=" buffer-window
 buffer-window = 1*10DIGIT

The buffer-window parameter specifies the amount of data that is required to be buffered by clients if they are receiving the data at the bit rate given by the b=AS field. The value of the buffer-window parameter is expressed in millisecond time units. The valid numerical range of the buffer-window parameter is from 0 to 4,294,967,265, inclusive.