在TI DaVinci雙核心平台上以XDAIS標準封裝H.264編碼器

Abstract

由於輸入/輸出控制、記憶體管理及其他硬體元件的差異，傳統數位訊號處理(DSP)程式在不同嵌入式系統上的實做往往有很大的差異。此外，嵌入式系統資源有限，當多個演算法在系統中同時運行時往往會產生資源競爭的問題。德州儀器公司(TI)提出了eXpress DSP演算法互通介面標準(XDAIS, eXpressDsp Algorithm Interoperability Standard)以增加DSP程式在不同環境中的可攜性、可用性並協調不同演算法間的溝通。應用了XDAIS標準的達芬奇技術(DaVinci Technology)亦由TI發展出來，提供了一個研發多媒體產品的完整解決方案。 然而，開發出一個符合XDAIS標準的程式不是件容易的事情，以XDAIS標準封裝演算法時往往會遇到困難。另一方面，開發者們也關心著XDAIS與DaVinci Technology的效能問題。在本研究中，我們嘗試以XDAIS標準封裝一H.264編碼器，並驗證於TI DM6446雙核心平台，以期能深入了解DaVinci Technology及將此封裝技術提供予台灣產學界。

Traditional Digital Signal Processing (DSP) programs are usually various according to specific embedded systems, i.e., I/O handling mechanisms, memory management policies or hardware components. In addition, resource competition occurs while multiple algorithms executing simultaneously on a system-on-chip (Soc). eXpressDsp Algorithm Interoperability Standard (XDAIS) was proposed by Texas Instruments (TI). The XDAIS can support interoperability, compatibility as well as reusability across environments for DSP programs. TI also evolved DaVinci Technology applying to XDAIS. The technology provides a complete solution for advanced implementation of multimedia products. However, it is a challenge to make a XDAIS-compliant program. While encapsulating algorithms to follow XDAIS standards will encounter difficulties frequently. On the other hand, the developers are concerned about the overheads induced by XDAIS and DaVinci Technology. In the study, we attempt to encapsulate a H.264 encoder with XDAIS and examine it on the DaVinci DM6446 dual-core platform. Therefore, we anticipate to introduce encapsulation techniques as well as to thoroughly understand the Technology for industries and academies in Taiwan.