android 多媒体开发技术浅析 2012.10.14. android multimedia framework
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Android多媒体开发技术浅析
2012.10.14
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Android Multimedia Framework
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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 platformsPortable 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
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”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 PortabilityDevelop 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
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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/
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Media recorder state mechine
Idle
Initialezed
Preparing
Prepared
Recording
Released
Error
setAudoSource()/setVideoSource()
setAudoSource()/setVideoSource()
setAudioEncoder()setVideoEncoder()
setOutputFile()setVideoSize()
setVideoFrameRate()setPreviewDisplay()
setOutputFormat()
reset()
reset()
Prepare()
reset()
Start()
reset()/stop()
release()
reset()
Error occurs or an invalid call
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Application
• 照相机系统:android.hardware.Camera
• 实现录音:android.media.MediaRecorder
• 实现播放:android.media.MediaPlayer
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Graphics
Skia 是 Google 一个底层的图形、图像、动画、 SVG 、文本等多方面的图形库,是 Android 中图形系统的引擎。
• 图形包的文件路径如下:frameworks/base/graphics/java/android/graphics/
• 实现图形库:android.graphics.*;
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Media Scanner
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DLNA
DLNA ( DIGITAL LIVING NETWORK ALLIANCE ,数字家庭网络联盟)
• DMS( 数字媒体服务器 )
• DMP( 数字媒体播放器 )
• DMC( 数字媒体控制器 )
• DMD( 数字媒体下载 )
• DMU( 数字媒体上传 )
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DLNA 结构图
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The More
• 视频电话• 家庭控制系统• 基于多媒体分享社交平台
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09/17/12 20
Thanks !