發(fā)布時間：2018-08-01 08:01

【摘要】：為推動中國高清光盤產(chǎn)業(yè)的發(fā)展，中國高清光盤產(chǎn)業(yè)推進聯(lián)盟結(jié)合國內(nèi)藍光和紅光的力量，致力于在光盤物理格式之上建立一致的應(yīng)用層格式，以提高整體競爭力。光盤應(yīng)用數(shù)據(jù)格式規(guī)定了音視頻流和元數(shù)據(jù)的格式，以及它們在光盤上的組織形式。如何同時兼顧到光盤物理特性、音視頻數(shù)據(jù)特性及高清視頻播放體驗，提供最優(yōu)的數(shù)據(jù)組織和訪問特性，，從而設(shè)計合理的應(yīng)用數(shù)據(jù)格式，成為了需要研究解決的問題。 光盤數(shù)據(jù)存在隨機讀取性能較差、差錯率相對較高、以塊存取并校驗等特點。因此，將高清音視頻流的封裝分為復(fù)用層和物理層兩層，分別處理音視頻交織同步和數(shù)據(jù)之間的獨立性。對封裝過程采用主動容錯，并結(jié)合元數(shù)據(jù)冗余存儲，共同降低出錯的可能性。封裝結(jié)構(gòu)使用動態(tài)頭部的方式減少空間消耗，提高負載率，并通過均衡碼率等方法充分利用光盤容量。設(shè)計了以視頻對象集、時間索引、節(jié)目片段、播放鏈和全局影片信息為層次的元數(shù)據(jù)組織結(jié)構(gòu)。為光盤節(jié)目播放提供了多重流選擇、時間定位、節(jié)目場景重組、多視頻文件穿插的特性，同時提高節(jié)目編著的靈活性。使用FFmpeg的復(fù)用框架構(gòu)造出流復(fù)用功能的整體模塊，對應(yīng)實現(xiàn)一個平臺無關(guān)的解復(fù)用開發(fā)組件。最后通過自定義的鏡像生成模塊構(gòu)建文件系統(tǒng)，將元數(shù)據(jù)及其冗余文件分別定位到光盤的內(nèi)道和外道，增加可靠性。 測試結(jié)果表明流復(fù)用、鏡像生成和解復(fù)用整個過程均能順利進行。流復(fù)用的負載率高于藍光光盤，略低于MP4格式。其它各子部分也分別達到預(yù)期，方案具備可行性。
[Abstract]:In order to promote the development of China's HDCD industry, the China HDCD Industry Promotion Alliance combines the domestic forces of Blu-ray and Red Light and devotes itself to establishing a consistent application layer format on the physical format of CD-ROMs in order to improve the overall competitiveness. Optical disk application data formats specify the format of audio and video streams and metadata, and their organization on the disc. How to simultaneously take into account the physical characteristics of optical discs, audio and video data characteristics and high-definition video playback experience, to provide the best data organization and access characteristics, so as to design a reasonable application data format, has become a problem to be studied and solved. The optical disk data has the characteristics of poor random reading performance, relatively high error rate, block access and verification. Therefore, the encapsulation of high-definition audio and video stream is divided into two layers: multiplexing layer and physical layer, which deal with the synchronization of audio and video interleaving and the independence of data respectively. In the encapsulation process, active fault tolerance and metadata redundant storage are used to reduce the possibility of error. The encapsulation structure uses dynamic header to reduce space consumption, improve load rate, and make full use of optical disk capacity by balancing code rate and so on. The structure of metadata organization is designed based on video object set, time index, program segment, play chain and global video information. It provides the features of multiple stream selection, time orientation, program scene reorganization, multiple video files interlacing, and improves the flexibility of program authoring. The whole module of streaming multiplexing is constructed by using FFmpeg's reuse framework, and a platform-independent demultiplexing development component is implemented. Finally, the file system is constructed by the self-defined mirror generation module, and the metadata and its redundant files are positioned to the inner and outer channels of the optical disk, respectively, so as to increase the reliability. The test results show that the whole process of stream multiplexing, image generation and demultiplexing can proceed smoothly. The load rate of stream multiplexing is higher than Blu-ray disc and slightly lower than MP4 format. The other sub-parts also meet the expectations, the plan is feasible.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP333.4

【參考文獻】

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本文編號：2156834