Design And Implementation Of Multi-channel Audio Playback System Based On Streaming Media

With the gradual application of the Internet application in all walks of life, Digital TVhas gradually replaced the traditional TV, and become an important product of householdappliances. Digital TV provides users with traditional television services and additionalweb surfing, E-mail and entertainment, e-commerce, and other function, makes the user’slife entertainment diversification. At the same time, the digital television started usingmultichannel audio format for audio data transmission. The audio coding technologyprovided by Dolby company has been used by the major digital TV service providers.According to the actual needs of the system,we have carried on the demand analysisof system function,built the system function framework,and design requirements of eachfunctional module of the system.Starting from the actual demand, we have analysed the content of MPEG2-TSstreaming media protocol,design the method of TS stream parsing according to the datastructure of the agreement,optimized the TS stream multiplexing module according to theframework,add new features to it according to its design requirements,and design themethod of transplant based on the system hardware and software environment.Based on the analysis method of MPEG2-TS,we have achieved the specific parsingprocess,and optimized memory usage by using methods such ad improving bufferstorage.According to the principle of the multi-channel audio decoding,we have achieveda module function whitch can converse multi-channel audio,optimized the relevant partwhen decoding some audio formats,completed the target of transplant MPlayer on CE4100platform according to the system hardware conditions and the transplant method andsolved the problems of system transplant and optimized the output modulefunction,improved the audio time calculations in the audio output module according to theproblems in system debugging about audio and video synchronization playing.