【正文】 音視頻編碼解碼研究 I 摘 要 編碼 主要有三方面的含義：模擬信號的數(shù)字化過程、數(shù)據(jù)的壓縮過程和數(shù)據(jù)的加密過程。本文所研究的范圍是音頻、視頻的壓縮編碼和解壓縮解碼問題。 本文 目的 是在研究已有的音視頻編碼解碼基礎上，嘗試將無損壓縮應用于音頻、視頻的編碼和解碼，開發(fā)出一種新的編解碼方法，并在新方法的研究過程中對已有的編解碼原理進行驗證加深理解，并探究音視頻編解碼 在實際生活中運用的意義，理論與實際相結合的價值 。 本文先對已有的視頻、音頻的編解碼原理、機制和主流編解碼框架進行了整理和研究，然后根據(jù)已有原理嘗試應用新的思想開發(fā)了一種音視頻 編碼解碼方法，通過運用 DirectShow和 VC++作為開發(fā)工具，引用 Zlib 函數(shù)庫來實現(xiàn)了這種音視頻編碼解碼方法，并通過運行測試對新的編解碼方法對 CPU 運行的影響、編碼后的文件大小和網(wǎng)絡傳輸時間的花費三方面進行了測試和總結 。 通過研究開發(fā)出了這種新的編解碼方法，經(jīng)測試發(fā)現(xiàn)新的編碼方法較未編碼時花費較多的 CPU 資源，編碼后的文件大小大約是未編碼文件時的 1/2 左右，網(wǎng)絡傳輸時間的花費也較少。 通過研究證明音視頻的編碼解碼過程就是音視頻壓縮與解壓縮的過程。 無損壓縮 也能較好的對音頻和 圖像數(shù)據(jù) 進行壓縮 。 無損 壓縮音視頻的編碼方式可應用于對于圖像還原有較高要求的領域。 關鍵詞： 音頻 ； 視頻 ； 編碼；解碼 音視頻編碼解碼研究 II The Research on Audio and Video Encoding and Decoding Abstract There are three main coding meaning: the digital simulation signal process, data pression process and data encryption process. This paper studies the range of audio and video Encoding and Decoding. The purpose is to research that basis on the existing of video encoding and decoding, try to be applied to audio and video with nondestructive pressed video encoding and decoding, developed a new kind of encoding and decoding method, in the process of encoding and decoding principle, verify and explore deeper understanding audio and video codec used in real life, the value of bining theory with practice. This paper first to research and summarize the video and audio codec principle, mechanism and mainstream decoding frame, and then based on the principle and new ideas to develop an audio and video codec encoding and decoding method, using VC + +, DirectShow as development tools, citing a function of Zlib to realize this method, and through the operation of the new test method of encoding and decoding CPU run after the impact, the code of the file size and work transmission time spent three aspects were tested and summarized. Through the research and develop the new decoding method, the new method of testing code spend more resources than when the CPU is not coding, the code file size is about the1/2 of the files without code, and work transmission spent less time. Through the research of audio and video encoding and decoding process is to pression and unpress process. nondestructive press also can better pression condition of audio and image data. Audio and video pression condition can be applied to the coding method for image still higher requirement of original. Key Words： Audio。 Video。 Encoding。 Decoding 音視頻編碼解碼研究 III 目 錄 摘 要 ............................................................................................................................. I Abstract............................................................................................................................... II 一、引言 ............................................................................................................................ 1 二、音視頻編解碼原理 .................................................................................................... 2 （一）視頻編碼原理 ........................................................................................................ 2 1. 去時域冗余信息 ................................................................................................... 2 2. 去幀域冗余信息 ................................................................................................... 2 （二）視頻編碼機制 ........................................................................................................ 3 ................................................................................................................. 4 ................................................................................................................. 4 （三）主流視頻編碼框架 ................................................................................................ 5 1. MPEG ..................................................................................................................... 5 2. ..................................................................................................................... 5 3. 微軟 windows media............................................................................................. 6 4. QuickTime.............................................................................................................. 6 5. Real Media ............................................................................................................. 6 （四）視頻解碼原理 ........................................................................................................ 6 （五）音頻編碼原理 ........................................................................................................ 6 （六）音頻 編碼機制 ........................................................................................................ 6 （七）主流音頻編碼框架 ................................................................................................ 7 1. WAVE .................................................................................................................... 7 2. MP3 ........................................................................................................................ 7 3. OGG ....................................................................................................................... 7 4. WMA...................................................................................................................... 8 5. RA ..........................................