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研究生:陳立群
研究生(外文):Li-ChiunChen
論文名稱:AndroidOpenCORE之功率感知H.264解碼於異質多核心平台之分析與實現
論文名稱(外文):Analysis and Implementation of Power-Aware H.264 Decoding for Android OpenCORE on Heterogeneous Multicore Platform
指導教授:黃悅民黃悅民引用關係
指導教授(外文):Yueh-Min Huang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:工程科學系碩博士班
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2010
畢業學年度:98
語文別:中文
論文頁數:65
中文關鍵詞:功率感知H.264DVFSPAC Duo
外文關鍵詞:power-awareH.264DVFSPAC Duo
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近年來,越來越多手持裝置採用Android為作業系統,由於其開放的特性,讓開發者有很大的研發空間,面對需求越來越大的多媒體播放能力,其OpenCORE多媒體框架更提供了開發的基礎。
此外,為了加強多媒體處理的能力,許多平台會利用DSP加強影像處理的效能。對於手持裝置這類以電池驅動的產品來說,省電一直是很多人探討的議題,面對這個難題,若能導入DVFS(Dynamic Voltage and Frequency Scaling)的機制,視處理器的負載調整合適的電壓及頻率,將可以節省許多電能,進而延長電池的壽命,也讓產品在市場上更有競爭力。
本文以PAC Duo SoC異質多核心平台為基礎,於Android作業系統的OpenCORE多媒體框架下增加對Dual DSP H.264解碼的支援,並針對其解碼流程與特性設計了一套DVFS機制,最後驗證及分析此套機制在平行影像解碼之省電效果。

In recent years, more and more mobile devices choose Android as their OS. Because of this open source project, developers get a free environment to do anything. Moreover, to meet the growing requirement for multimedia playback, Android’s OpenCORE multimedia framework also provides a great base for development.
In addition, to deal with multimedia processing, some mobile devices may contain DSP to enhance performance. For such kinds of battery-driven devices, power saving is always an interesting issue. In this case, if we can integrate DVFS (Dynamic Voltage and Frequency Scaling) with video decoding to dynamically adjust suitable voltage and frequency according to processor’s loading, more energy could be saved. Thus the battery can come with better performance and make the product more competitive.
This thesis first describes how to add support for Dual DSP H.264 decoding for Android OpenCORE on heterogeneous multicore platform PAC Duo SoC. Then it proposes a DVFS mechanism for the decoding flow according to its characteristics, verifies and analyzes this mechanism for its performance on energy reduction on parallel video decoding.

中文摘要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VI
圖目錄 VII
第一章 緒論 1
1.1 研究動機 1
1.2研究目的 2
1.3章節提要 2
第二章 硬體平台介紹 4
2.1 PAC Duo SoC 4
第三章 軟體架構介紹 13
3.1 Android 13
3.1.1 Android 特色 13
3.1.2 Android系統架構 13
3.2 Android OpenCORE 16
3.2.1 OpenCORE Framework 16
3.2.2 OpenCORE Video Codecs 17
第四章 相關標準與研究 19
4.1 H.264 19
4.1.1 H.264簡介 19
4.1.2 H.264 Decoder 20
4.2 Dual DSP Parallel Decoding Algorithm for H.264 21
4.3 工研院 Dual DSP H.264 解碼器 25
4.4 DVFS 27
4.5 PAC Duo PM Driver 30
第五章 功率感知H.264解碼於OpenCORE之設計與實現 32
5.1 系統架構與設計實作流程 32
5.2 開發環境之建置 33
5.1.1 建立編譯環境 34
5.1.2 編譯Linux Kernel 34
5.1.3編譯Android 35
5.1.4 於PAC Duo SoC上運行系統 36
5.2 Dual DSP H.264解碼器與OpenCORE之整合 37
5.3 DSP1 PM Drive之實現 41
5.4 DVFS演算法之設計與實現 43
5.4.1 DVFS演算法之分析 43
5.4.2 DVFS演算法之實作 47
5.4.3 DVFS演算法之修正機制 48
5.4.4 DVFS演算法與OpenCORE解碼之整合 49
5.5 Player APK之實現 51
第六章 系統實作結果與分析 55
6.1測試環境 55
6.2測試結果與分析 55
6.2.1 樣本數對預測模型準確度的影響 55
6.2.2 DVFS level數對能量消耗的影響 56
6.2.3 Bitrate對能量消耗的影響 57
6.2.4 Deadline miss之分析 58
6.2.5 Decoding time之分析 59
第七章 結論與未來展望 62
參考文獻 63

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