The Research And Realization On H.264 Decoder Based On Blackfin533

In the recent years, along with Internet in global scope daily popularization, 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 become 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 JM8.6 code.At the core to ADSP BF 533 processor produced by ADI Company, paper construct the decoder of the H.264, gives a overall framework of the system hardware. It analyzes the reference pattern of H.264–JM8.6. According to the characteristic of ADSP BF 533, it optimizes the Algorithm of H.264 Baseline Profile Decoder, prepares link description file, does Optimal allocation to Cache using Conversion operations, and finish 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 every components of the decoder. It gives the Optimization Software Series of decoder based on reference model JM8.6. In entropy module, resolute code table, changes the way of search, can noticeably improves the efficiency lookup, and then improves the operating speed. Interpolation scene, minimization reference frame data can conserve the bandwidth of memory chip in luma pixel interpolation algorithm. In the deblocking filter algorithm, strength filter function getNeighbour() has been call again. The execution can be improved by removing redundant code and void judgment and big priority probability judgment. Meanwhile, reasonable arrangements for the data storage space can improve the deblocking filter speed.Finally, the decoder has been tested on the development board ADSP-BF533 EZ-KIT LITE. The test data shows the decoder real-time decoding results of CIF format at the speeding of 30 frames per second has achieved.