【摘要】 针对手机和其他嵌入式平台特点,对AVS-P7 Jiben解码器进行了C语言级优化.通过对流缓存、指数Golomb解码、VLD码表、反量化、反变换、宏块解码、运动补偿插值等模块的优化处理,降低了运算复杂度,减少了内存开销.在S3C2440(ARM920T)平台上的测试结果表明,解码器在同等PSNR、无失真情况下比原有解码器提升了8~10倍的性能,基本满足了实时解码的需要.本文最后采用标准的AVS-P7一致性测试码流对优化后的解码器进行了一致性测试,发现同AVS标准组织提供的wm 2.7相比,测试结果更加理想.更多还原

【Abstract】 According to the characteristics of the mobile and other embedded system,the AVS-P7 Jiben profile decoder was optimized with C language.After the optimization of the streambuffer,Exp-Golomb decoding,VLD look-up table,inverse quantization,inverse transformation,macroblock decoding,motion compensation and interpolation modules,the computational complexity and the memory were greatly reduced.The simulation results in the S3C2440(ARM920T) showed that the optimized decoder was improved 8~10 times as compared with the original decoder with the same PSNR without any distortion,which meet the basic real-time decoding requirements.Finally,the AVS standard conformance test using the AVS-P7 conformance test bitstream showed that the test results are more satisfied and ideal than the wm 2.7 provided by the AVS standard organization.更多还原