sdl, good game open source project, there are audio and image processing code.

SDL2-2.0.2
..........\acinclude
..........\.........\ac_check_define.m4
..........\.........\alsa.m4
..........\.........\ax_check_compiler_flags.m4
..........\.........\ax_gcc_archflag.m4
..........\.........\ax_gcc_x86_cpuid.m4.htm
..........\.........\esd.m4
..........\.........\libtool.m4
..........\.........\ltoptions.m4
..........\.........\ltsugar.m4
..........\.........\ltversion.m4
..........\.........\lt~obsolete.m4
..........\android-project
..........\...............\AndroidManifest.xml
..........\...............\ant.properties
..........\...............\build.properties
..........\...............\build.xml
..........\...............\default.properties
..........\...............\jni
..........\...............\...\Android.mk
..........\...............\...\Application.mk
..........\...............\...\src
..........\...............\...\...\Android.mk
..........\...............\...\...\Android_static.mk
..........\...............\proguard-project.txt
..........\...............\project.properties
..........\...............\res
..........\...............\...\drawable-hdpi
..........\...............\...\.............\ic_launcher.png
..........\...............\...\drawable-mdpi
..........\...............\...\.............\ic_launcher.png
..........\...............\...\drawable-xhdpi
..........\...............\...\..............\ic_launcher.png
..........\...............\...\drawable-xxhdpi
..........\...............\...\...............\ic_launcher.png
..........\...............\...\layout
..........\...............\...\......\main.xml
..........\...............\...\values
..........\...............\...\......\strings.xml
..........\...............\src
..........\...............\...\org
..........\...............\...\...\libsdl
..........\...............\...\...\......\app
..........\...............\...\...\......\...\SDLActivity.java
..........\Android.mk
..........\autogen.sh
..........\BUGS.txt
..........\build-scripts
..........\.............\androidbuild.sh
..........\.............\config.guess
..........\.............\config.sub
..........\.............\g++-fat.sh
..........\.............\gcc-fat.sh
..........\.............\install-sh
..........\.............\iosbuild.sh
..........\.............\ltmain.sh
..........\.............\mkinstalldirs
..........\.............\raspberrypi-buildbot.sh
..........\.............\showrev.sh
..........\.............\strip_fPIC.sh
..........\.............\updaterev.sh
..........\cmake
..........\.....\macros.cmake
..........\.....\sdlchecks.cmake
..........\CMakeLists.txt
..........\configure
..........\configure.in
..........\COPYING.txt
..........\CREDITS.txt
..........\debian
..........\......\changelog
..........\......\compat
..........\......\control
..........\......\copyright
..........\......\docs
..........\......\libsdl2-dev.install
..........\......\libsdl2-dev.manpages
..........\......\libsdl2.install
..........\......\rules
..........\......\sdl2-config.1
..........\......\source
..........\......\......\format
..........\......\watch
..........\include
..........\.......\begin_code.h
..........\.......\close_code.h
..........\.......\doxyfile
..........\.......\SDL.h
..........\.......\SDL_assert.h
..........\.......\SDL_atomic.h
..........\.......\SDL_audio.h
..........\.......\SDL_bits.h
..........\.......\SDL_blendmode.h
..........\.......\SDL_clipboard.h
..........\.......\SDL_config.h
..........\.......\SDL_config.h.cmake
..........\.......\SDL_config.h.in
..........\.......\SDL_config_android.h
..........\.......\SDL_config_iphoneos.h

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