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2014/10/16 ¤W¤È 08:20:08
android Programming Glossary: neonhttp://stackoverflow.com/questions/12260149/libjpeg-turbo-for-android add to command line LOCAL_ARM_MODE arm If your target has NEON support add to command line LOCAL_ARM_NEON true ARCH_ARM_HAVE_NEON..
Low-latency audio playback on Android http://stackoverflow.com/questions/14842803/low-latency-audio-playback-on-android and hard to debug. Use vector instructions such as NEON SSE or whatever the equivalent instruction set is on your target..
Retrieving Device Information on Android http://stackoverflow.com/questions/2201112/retrieving-device-information-on-android architecture but information like whether the CPU supports NEON instructions or such. For that kind of information you could..
Floating point or fixed-point for Android NDK OpenGL apps? http://stackoverflow.com/questions/3385964/floating-point-or-fixed-point-for-android-ndk-opengl-apps much more than that. Some devices additionally support the NEON Advanced SIMD extension which provides some fancy features beyond..
Producing optimised NDK code for multiple architectures? http://stackoverflow.com/questions/5089783/producing-optimised-ndk-code-for-multiple-architectures floating point instructions and some ARMv7 chips support NEON instructions and that the default ARM supports neither of these... Is it possible to set flags so that I can build ARMv7 with NEON ARMv7 without NEON and the default ARM build I'm know how to.. flags so that I can build ARMv7 with NEON ARMv7 without NEON and the default ARM build I'm know how to do the latter two..
What is the best method to render video frames? http://stackoverflow.com/questions/5666513/what-is-the-best-method-to-render-video-frames decoding combined with available CPU extensions like NEON for color space conversion. An implementation of YUV 2 RGB for.. color space conversion. An implementation of YUV 2 RGB for NEON exists here . The means by which you draw the frames SDL vs.. cases. You can determine if your target device supports NEON enhancements by running cat proc cpuinfo from adb shell and..
Is there a way to let Android NDK-build use a newer version of gcc? http://stackoverflow.com/questions/5786679/is-there-a-way-to-let-android-ndk-build-use-a-newer-version-of-gcc bug on generating not optimal assembly code for certain NEON intrinsics http gcc.gnu.org bugzilla show_bug.cgi id 43118 http..
Which compiler does Android NDK use? http://stackoverflow.com/questions/6602929/which-compiler-does-android-ndk-use compiler does Android NDK use I'm writing ARM NEON based code for an Android application and I was struggling with..
Android build system, NEON and non-NEON builds http://stackoverflow.com/questions/7679363/android-build-system-neon-and-non-neon-builds build system NEON and non NEON builds I want to build my library for armv6 and.. build system NEON and non NEON builds I want to build my library for armv6 and there is some.. pre neon devices e.g. armeabi . 3 this build contains NEON code which could be executed based on run time cpu detection..
http://stackoverflow.com/questions/12660043/arm-linux-androideabi-gcc-is-unable-to-create-an-executable-compile-ffmpeg-fo v7n #CPU armv7 a #OPTIMIZE_CFLAGS mfloat abi softfp mfpu neon marm march CPU mtune cortex a8 #PREFIX . android CPU #ADDITIONAL_CONFIGURE_FLAG.. a8 #PREFIX . android CPU #ADDITIONAL_CONFIGURE_FLAG enable neon #build_one #arm v6 vfp #CPU armv6 #OPTIMIZE_CFLAGS DCMP_HAVE_VFP..
Producing optimised NDK code for multiple architectures? http://stackoverflow.com/questions/5089783/producing-optimised-ndk-code-for-multiple-architectures example in the NDK samples directory that does this hello neon . Under the hood Thumb 2 is more ARM like in that its instructions..
Android build system, NEON and non-NEON builds http://stackoverflow.com/questions/7679363/android-build-system-neon-and-non-neon-builds I want to build my library for armv6 and there is some neon code that I enable at runtime if device supports it. The neon.. code that I enable at runtime if device supports it. The neon code uses neon intrinsics and to be able to compile I must enable.. at runtime if device supports it. The neon code uses neon intrinsics and to be able to compile I must enable armeabi v7a..
http://stackoverflow.com/questions/12260149/libjpeg-turbo-for-android
Low-latency audio playback on Android http://stackoverflow.com/questions/14842803/low-latency-audio-playback-on-android get this wrong and end up with glitches that are unpredictable and hard to debug. Use vector instructions such as NEON SSE or whatever the equivalent instruction set is on your target processor. Test and measure your code. Track how long it..
Retrieving Device Information on Android http://stackoverflow.com/questions/2201112/retrieving-device-information-on-android This gives you a baseline for the CPU architecture but information like whether the CPU supports NEON instructions or such. For that kind of information you could conceivably use the NDK to run some native code to interrogate..
Floating point or fixed-point for Android NDK OpenGL apps? http://stackoverflow.com/questions/3385964/floating-point-or-fixed-point-for-android-ndk-opengl-apps much about the GL implementation though so I can't offer much more than that. Some devices additionally support the NEON Advanced SIMD extension which provides some fancy features beyond what the basic VFP support has. However you must test..
Producing optimised NDK code for multiple architectures? http://stackoverflow.com/questions/5089783/producing-optimised-ndk-code-for-multiple-architectures with #ifdef branches. For example I'm aware that ARMv7 has floating point instructions and some ARMv7 chips support NEON instructions and that the default ARM supports neither of these. Is it possible to set flags so that I can build ARMv7 with.. and that the default ARM supports neither of these. Is it possible to set flags so that I can build ARMv7 with NEON ARMv7 without NEON and the default ARM build I'm know how to do the latter two but not all 3. I'm cautious about what settings.. default ARM supports neither of these. Is it possible to set flags so that I can build ARMv7 with NEON ARMv7 without NEON and the default ARM build I'm know how to do the latter two but not all 3. I'm cautious about what settings I use as I assume..
What is the best method to render video frames? http://stackoverflow.com/questions/5666513/what-is-the-best-method-to-render-video-frames Options For the above reasons many have chosen to use software decoding combined with available CPU extensions like NEON for color space conversion. An implementation of YUV 2 RGB for NEON exists here . The means by which you draw the frames.. combined with available CPU extensions like NEON for color space conversion. An implementation of YUV 2 RGB for NEON exists here . The means by which you draw the frames SDL vs openGL should not matter for RGB since you are copying the same.. RGB since you are copying the same number of pixels in both cases. You can determine if your target device supports NEON enhancements by running cat proc cpuinfo from adb shell and looking for NEON in the features output. share improve this..
Is there a way to let Android NDK-build use a newer version of gcc? http://stackoverflow.com/questions/5786679/is-there-a-way-to-let-android-ndk-build-use-a-newer-version-of-gcc of gcc The reason I want to do this is Gcc4.4.3 has known bug on generating not optimal assembly code for certain NEON intrinsics http gcc.gnu.org bugzilla show_bug.cgi id 43118 http hilbert space.de p 22 The newly released GCC 4.6 claims..
Which compiler does Android NDK use? http://stackoverflow.com/questions/6602929/which-compiler-does-android-ndk-use compiler does Android NDK use I'm writing ARM NEON based code for an Android application and I was struggling with certain compiler flags not being recognized. I later realized..
Android build system, NEON and non-NEON builds http://stackoverflow.com/questions/7679363/android-build-system-neon-and-non-neon-builds build system NEON and non NEON builds I want to build my library for armv6 and there is some neon code that I enable at runtime if device.. build system NEON and non NEON builds I want to build my library for armv6 and there is some neon code that I enable at runtime if device supports it... main points 1 make only ONE lib. 2 make build that runs on armv6 pre neon devices e.g. armeabi . 3 this build contains NEON code which could be executed based on run time cpu detection cpu detection is outside the scope of the question . 4 NEON..
http://stackoverflow.com/questions/12660043/arm-linux-androideabi-gcc-is-unable-to-create-an-executable-compile-ffmpeg-fo . android CPU vfp #ADDITIONAL_CONFIGURE_FLAG #build_one #arm v7n #CPU armv7 a #OPTIMIZE_CFLAGS mfloat abi softfp mfpu neon marm march CPU mtune cortex a8 #PREFIX . android CPU #ADDITIONAL_CONFIGURE_FLAG enable neon #build_one #arm v6 vfp #CPU.. mfloat abi softfp mfpu neon marm march CPU mtune cortex a8 #PREFIX . android CPU #ADDITIONAL_CONFIGURE_FLAG enable neon #build_one #arm v6 vfp #CPU armv6 #OPTIMIZE_CFLAGS DCMP_HAVE_VFP mfloat abi softfp mfpu vfp marm march CPU #PREFIX . android..
Producing optimised NDK code for multiple architectures? http://stackoverflow.com/questions/5089783/producing-optimised-ndk-code-for-multiple-architectures for when it is available and when it is not. There's an example in the NDK samples directory that does this hello neon . Under the hood Thumb 2 is more ARM like in that its instructions can do more in a single instruction while having the..
Android build system, NEON and non-NEON builds http://stackoverflow.com/questions/7679363/android-build-system-neon-and-non-neon-builds build system NEON and non NEON builds I want to build my library for armv6 and there is some neon code that I enable at runtime if device supports it. The neon code uses neon intrinsics and to be able to compile I must.. I want to build my library for armv6 and there is some neon code that I enable at runtime if device supports it. The neon code uses neon intrinsics and to be able to compile I must enable armeabi v7a but that affects regular c code it becomes.. my library for armv6 and there is some neon code that I enable at runtime if device supports it. The neon code uses neon intrinsics and to be able to compile I must enable armeabi v7a but that affects regular c code it becomes broken on some..
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