add snapshot interface，using GPU decoder and save jpg format

SingleVideoPlayer\.classpath
.................\.project
.................\AndroidManifest.xml
.................\ic_launcher-web.png
.................\proguard-project.txt
.................\project.properties
.................\res\drawable-hdpi\ic_launcher.png
.................\...\.........mdpi\ic_launcher.png
.................\...\.........xhdpi\ic_launcher.png
.................\...\..........xhdpi\ic_launcher.png
.................\...\layout\set_rtsp_path.xml
.................\...\......\view.xml
.................\...\values\attrs.xml
.................\...\......\colors.xml
.................\...\......\strings.xml
.................\...\......\styles.xml
.................\src\com\via\singlevideoplayer\SingleVideoActivity.java
.................\...\...\...\singlevideoplayer
.................\...\...\via
.................\res\drawable-hdpi
.................\...\drawable-ldpi
.................\...\drawable-mdpi
.................\...\drawable-xhdpi
.................\...\drawable-xxhdpi
.................\...\layout
.................\...\values
.................\...\values-v11
.................\...\values-v14
.................\src\com
.................\libs
.................\res
.................\src
SingleVideoPlayer

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