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MPEG-4 Book, The by Touradj Ebrahimi, Fernando Pereira

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B.1. Complexity Units

Complexity units are defined to give an approximation of the decoder complexity in terms of processing power and RAM usage required for processing MPEG-4 Audio bitstreams in dependence of specific parameters.

The approximate processing power is given in Processor Complexity Units (PCU), specified in integer numbers of MOPS (Millions of Operations Per Second). The approximated RAM usage is given in RAM Complexity Units (RCU), specified in (mostly) integer numbers of kWords (1,000 Words) [MPEG4-4]. The RCU numbers do not include working buffers that can be shared among different objects and/or channels.

If a level for a profile is specified by the maximum number of complexity units, then a flexible configuration of the decoder ...

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