H.264 Video Decoder Realization And Optimization Based On BF561

Along with Internet's daily popularization in global scope,swift and violent development of mobile communication,the network transmission as well as each kind of emerging multimedia service all unexpectedly appears.Many new requests have been set arranged to the encoding and decoding technology of video.How to provide the higher transmission quality becomes hot spot in information science and the technical research.This paper realizes the real-time decoder of H.264 based on DSP,referring to the JM86 code.The author's sutdy is mainly in the application of H.264/AVC and the embedded system based on the Blackfin561.First,the author learns the basic thought and theory,studies the inter and intra prediction,the integer transform,the entropy coding,and so on,analyzes the detail of the standard,learns the syntax and semantics of the H.264/AVC.Second,the author learns the structure,the bus,the management of memory, management of the cache of the Blackfin561,studies the Instruction Set of the Blackfin561.The structure of program and video instruction is learned.Finally,at the core to ADSP-BF561 processor produced by ADI Company,paper constructs the decoder of the H.264.According to the characteristic of ADSP-BF561,it optimizes the Algorithm of H.264 Baseline Profile Decoder,prepares link description file,does Optimal allocation to Cache using conversion operations,and finishs the decoder on PC platform.On this basis,it standardizes data type,changes grammars,and realizes the transplantation of H.264 decoder from PC platform to DSP platform.Against the request of real-time application,the paper analyzes the core components of the decoder.It gives the optimization software series of decoder based on reference model JM86,and the execution can be improved greatly.Finally,the decoder has been tested on the development board ADSP-BF561 EZ-KIT LITE.The test data shows the decoder real-time decoding results of QCIF format has achieved.