Android多媒体开发技术浅析.ppt

Android多媒体开发技术浅析 2012.10.14 Android Multimedia Framework Media Applications Video Codecs Audio Codecs Image Codecs Media API Libraries Hardware: processors and accelerators Operating System Multimedia framework Silicon vendors provide high performance media primitive implementations optimized for their silicon architecture Media API library implementations re-use optimized primitives across diverse silicon and platforms Portable integration of Media API libraries into host operating system - if needed Available across a wide variety of processor architectures and operating systems and tool chains Physics Engines Focused on key ‘hotspot’ functions and algorithms Multimedia Software Stack ”Application Level”Media Application PortabilityApplications programmed using cross-vendor interfaces “Integration Level”Media Graph PortabilityIntegrate media networks using standard interconnect protocols “Development Level” Media Component Portability Develop portable media components using low-level media APIs More media applications available on more platforms for more end-user value! Component vendors can ship more advanced functionality across more processors. Media silicon vendors reduce costs and time to market Portable and powerful media processing graphs can flexibly leverage available platform media components Streaming Media Infrastructure PortabilityOpen, royalty-free standard IL DL AL OpenMAX defines three holistically designed media open standards to provide complete streaming media infrastructure portability OpenMAX - Three Layer Solution Media Multimedia File Path Stagefright的头文件路径如下： frameworks/include/media/stagefright/ 实现Stagefright 功能的文件路径如下： frameworks/base/media/libstagefright/ 实现Stagefright 播放和录音功能的文件路径如下： frameworks/base/media/libmediaplayerservice/ 实现录音和音频的文件路径如下： frameworks/base/media/libmedia/ Media recorder state mechine Application 照相机系统： android.hardware.Camera? 实现录音： androi