【摘要】：Android系統(tǒng)是一種嵌入式的多媒體系統(tǒng)。隨著多媒體技術的發(fā)展,圖像處理所需要的計算量越來越大,僅依靠一顆通用的CPU來完成復雜繁多的圖像處理計算,越來越困難。常用的DSP微處理器和Intel處理器擴展指令集方式的顯示硬件加速技術不能在嵌入式硬件平臺實現(xiàn),要減少嵌入式CPU處理圖像數(shù)據(jù)的負擔,需要使用CPU平臺的2D或3D模塊來實現(xiàn)顯示硬件加速。同時,音頻系統(tǒng)也因為沒有統(tǒng)一的音頻硬件,不同的平臺設備所使用的編解碼芯片,處理器音頻處理模塊各不相同,在跨平臺的時候,都需要開發(fā)者來完成軟件的移植。 針對上述問題,本文以使用的R2R(SH-MobileR2R,瑞薩SH7724處理器)硬件平臺為對象,研究分析了Android的顯示系統(tǒng)和音頻系統(tǒng)；解決的問題是在R2R硬件平臺上實現(xiàn)多硬件模塊協(xié)同加速圖像顯示,以及音頻系統(tǒng)的移植。本文主要工作如下： 1)結合Android系統(tǒng)堆棧層次的特點,自上層向下層的研究了Android多媒體的顯示系統(tǒng),針對R2R硬件平臺的2D硬件模塊的功能特點,結合Android顯示系統(tǒng)的架構,設計了多硬件模塊協(xié)同加速圖像顯示的方案； 2)采用從底層向頂層移植的思路,移植BEU(混合引擎)、2DDMAC(圖像獲取直接存儲器)硬件模塊驅動,硬件適配層。實現(xiàn)了Android顯示系統(tǒng)的硬件加速功能； 3)研究了Android音頻系統(tǒng)的硬件結構和軟件架構,結合R2R硬件平臺的特點,設計了R2R硬件平臺的音頻移植方案,使音頻系統(tǒng)支持多采樣率音頻文件播放,移植了音頻驅動和硬件適配層,實現(xiàn)了音頻系統(tǒng)功能。 經(jīng)過以上的移植,在R2R硬件平臺實現(xiàn)了Android系統(tǒng)多硬件模塊協(xié)同加速圖像顯示,提升了Android界面滑動的流暢度；實現(xiàn)了Android音頻系統(tǒng)在R2R硬件平臺上的移植,支持多采樣率音頻文件播放,成功使用Android應用程序播放音頻文件,通過移植前后對比分析,系統(tǒng)性能得到提升。
[Abstract]:Android system is an embedded multimedia system. With the development of multimedia technology, image processing needs more and more computation. It is more and more difficult to rely on a general CPU to complete the complicated and various image processing calculation. The commonly used DSP microprocessor and Intel processor extended instruction set display hardware acceleration technology can not be implemented on embedded hardware platform, so the burden of embedded CPU processing image data should be reduced. Need to use CPU platform 2 D or 3 D module to achieve display hardware acceleration. At the same time, the audio system also because there is no unified audio hardware, different platform devices used by the codec chip, processor audio processing modules are different, in cross-platform time, developers are required to complete the software migration. Aiming at the above problems, this paper takes the R2R (SH-MobileR2R, Resa SH7724 processor) hardware platform as the object, studies and analyzes the display system and audio system of Android. The problem is to realize multi-hardware module cooperative acceleration of image display and transplant audio system on R2R hardware platform. The main work of this paper is as follows: 1) according to the characteristics of Android system stack layer, the Android multimedia display system is studied from the upper layer down layer. According to the function characteristics of 2D hardware module of R2R hardware platform and the framework of Android display system, The scheme of multi-hardware module cooperative acceleration image display is designed. 2) using the idea of transplanting from the bottom layer to the top layer, transplanting BEU (hybrid engine), 2DDMAC (image acquisition direct memory) hardware module driver, hardware adaptation layer. The hardware acceleration function of Android display system is realized. 3) the hardware structure and software architecture of Android audio system are studied. According to the characteristics of R2R hardware platform, the audio transplant scheme of R2R hardware platform is designed, which enables the audio system to support multi-sampling rate audio file playback. The audio driver and hardware adaptation layer are transplanted to realize the function of audio system. After the above transplantation, the multi-hardware module of Android system can accelerate the image display cooperatively on the R2R hardware platform, which improves the smooth degree of Android interface sliding. The transplant of Android audio system on R2R hardware platform is realized, and the multi-sampling rate audio file playing is supported. The Android application is successfully used to play the audio file. The system performance is improved by comparing and analyzing before and after transplantation.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TP368.1;TP37

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