Develop Reference

build openh264 for android under linux

I'm trying to build openh264 to use on android
-I've the latest openh264 source from git
-I've ndk 17
-I'm using ubuntu 16.04
running
make OS=android NDKROOT=/home/r/aff/ndk TARGET=android-27 NDKLEVEL=27 sysroot=/home/r/aff/ndk/sysroot
I get the error:
r#r:~/aff/openh264$ make OS=android NDKROOT=/home/r/aff/ndk TARGET=android-27 NDKLEVEL=27 sysroot=/home/r/aff/ndk/sysroot/home/r/aff/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc -O3 -DNDEBUG -DHAVE_NEON -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -DANDROID_NDK -fpic --sysroot=/home/r/aff/ndk/platforms/android-27/arch-arm -MMD -MP -DGENERATED_VERSION_HEADER -I./codec/api/svc -I./codec/common/inc -Icodec/common/inc -I/home/r/aff/ndk/sysroot -Dandroid_getCpuIdArm=wels_getCpuIdArm -Dandroid_setCpuArm=wels_setCpuArm -Dandroid_getCpuCount=wels_getCpuCount -Dandroid_getCpuFamily=wels_getCpuFamily -Dandroid_getCpuFeatures=wels_getCpuFeatures -Dandroid_setCpu=wels_setCpu -I/home/r/aff/ndk/sources/android/cpufeatures -c -o codec/common/src/cpu-features.o /home/r/aff/ndk/sources/android/cpufeatures/cpu-features.c
In file included from /home/r/aff/ndk/sources/android/cpufeatures/cpu-features.c:64:0:
/home/r/aff/ndk/sources/android/cpufeatures/cpu-features.h:31:23: fatal error: sys/cdefs.h: No such file or directory
#include <sys/cdefs.h>
^
compilation terminated.
build/platform-android.mk:96: recipe for target 'codec/common/src/cpu-features.o' failed
make: *** [codec/common/src/cpu-features.o] Error 1

When in doubt, stop rolling your own build configurations and use a standalone toolchain (pay particular attention to the section at the bottom about "Building open source projects using standalone toolchains": https://developer.android.com/ndk/guides/standalone_toolchain

Changing from
TARGET=android-27 NDKLEVEL=27
to
TARGET=android-21 NDKLEVEL=21
solved this issue for me.

Android Studio Cmake: "The C compiler clang.exe is not able to compile a simple test program

64 bit Windows 10. Android Studio 2.3.3.
I'm trying to use JNI to link an existing C++ project to Android Studio. I've also tried to load all of the provided NDK-JNI sample projects. Everything with JNI/Cmake is unable to Gradle Sync, failing with the same error:
Build command failed.
Error while executing process C:\Users\Alex\AppData\Local\Android\Sdk\cmake\3.6.3155560\bin\cmake.exe with arguments {-HC:\Users\Alex\Desktop\android-ndk\hello-jni\app\src\main\cpp -BC:\Users\Alex\Desktop\android-ndk\hello-jni\app\.externalNativeBuild\cmake\armDebug\armeabi -GAndroid Gradle - Ninja -DANDROID_ABI=armeabi -DANDROID_NDK=C:\Users\Alex\AppData\Local\Android\Sdk\ndk-bundle -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=C:\Users\Alex\Desktop\android-ndk\hello-jni\app\build\intermediates\cmake\arm\debug\obj\armeabi -DCMAKE_BUILD_TYPE=Debug -DCMAKE_MAKE_PROGRAM=C:\Users\Alex\AppData\Local\Android\Sdk\cmake\3.6.3155560\bin\ninja.exe -DCMAKE_TOOLCHAIN_FILE=C:\Users\Alex\AppData\Local\Android\Sdk\ndk-bundle\build\cmake\android.toolchain.cmake -DANDROID_PLATFORM=android-23 -DANDROID_TOOLCHAIN=clang}
-- Check for working C compiler: C:/Users/Alex/AppData/Local/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe
-- Check for working C compiler: C:/Users/Alex/AppData/Local/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe -- broken
CMake Error at C:/Users/Alex/AppData/Local/Android/sdk/cmake/3.6.3155560/share/cmake-3.6/Modules/CMakeTestCCompiler.cmake:61 (message):
The C compiler
"C:/Users/Alex/AppData/Local/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe"
is not able to compile a simple test program.
It fails with the following output:
Change Dir: C:/Users/Alex/Desktop/android-ndk/hello-jni/app/.externalNativeBuild/cmake/armDebug/armeabi/CMakeFiles/CMakeTmp
Run Build
Command:"C:\Users\Alex\AppData\Local\Android\Sdk\cmake\3.6.3155560\bin\ninja.exe"
"cmTC_accda"
[1/2] Building C object CMakeFiles/cmTC_accda.dir/testCCompiler.c.o
[2/2] Linking C executable cmTC_accda
FAILED: cmd.exe /C "cd . &&
C:\Users\Alex\AppData\Local\Android\sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang.exe
--target=armv5te-none-linux-androideabi
--gcc-toolchain=C:/Users/Alex/AppData/Local/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64
--sysroot=C:/Users/Alex/AppData/Local/Android/sdk/ndk-bundle/sysroot
-isystem
C:/Users/Alex/AppData/Local/Android/sdk/ndk-bundle/sysroot/usr/include/arm-linux-androideabi
-D__ANDROID_API__=23 -g -DANDROID -ffunction-sections -funwind-tables
-fstack-protector-strong -no-canonical-prefixes -march=armv5te
-Werror=format-security -Wl,--exclude-libs,libgcc.a --sysroot
C:/Users/Alex/AppData/Local/Android/sdk/ndk-bundle/platforms/android-23/arch-arm64
-Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings
-Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro
-Wl,-z,now -Wl,--gc-sections -Wl,-z,nocopyreloc -pie -fPIE
CMakeFiles/cmTC_f48b1.dir/testCCompiler.c.o -o cmTC_f48b1 -lm && cd ."
The system cannot find the path specified.
ninja: build stopped: subcommand failed.
CMake will not be able to correctly generate this project.
I have all necessary SDK tools installed. I've tried using GCC instead of clang. Thanks for your help!

The main error message is:
The system cannot find the path specified.
Note that above some places use / as path separator:
"C:/Users/Alex/AppData/Local/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe"
and have run successfully. And this line:
C:\Users\Alex\AppData\Local\Android\sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang.exe
Seems to have failed. I guess the problem is the \. Try find where this path is defined, maybe in the IDE options, configuration files or Makefiles, then modify it may solve the problem.

Its because of clang version mismatch
check clang version you have and what minimum clang version Android Application needed!

Use build_libstagefright in ffmpeg to build file .so for android

In order to use ffmpeg in android , I tried to build ffmpeg by using build_libstagefright in
ffmpeg/tools/lib_stagefright
but it alwalys appear a error which i coundn't solve it.
the message in the bottom of ffmpeg/config.log is
arm-linux-androideabi-g++ -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -I../android-source/frameworks/base/include -I../android-source/system/core/include -I../android-source/frameworks/base/media/libstagefright -I../android-source/frameworks/base/include/media/stagefright/openmax -I/home/user/android-ndk/sources/cxx-stl/gnu-libstdc++/include -I/home/user/android-ndk/sources/cxx-stl/gnu-libstdc++/libs/armeabi-v7a/include -march=armv7-a -mfloat-abi=softfp -mfpu=neon -march=armv7-a -std=c99 -fomit-frame-pointer -fPIC -marm -Wno-multichar -fno-exceptions -fno-rtti -D__STDC_CONSTANT_MACROS -c -o /tmp/ffconf.6ZzEMs87.o /tmp/ffconf.5jbfvJxK.cpp
./configure: line 701: /home/user/android-ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-g++: cannot execute binary file
ERROR: libstagefright_h264 not found
Anyone have the solution of this ??
my Build Environment is
Window 7
Cygwin
android-NDK-r8b linux version

I found a method ,let me cross this error.
In file of ffmpeg/configure
origin :
enabled libstagefright_h264 && require_cpp libstagefright_h264 "binder/ProcessState.h media/stagefright/MetaData.h
fixed :
enabled libstagefright && require_cpp libstagefright_h264 "binder/ProcessState.h media/stagefright/MetaData.h
When I fix libstagefright_h264 to libstagefright here, it seems be normal until the next error.
CC libavcodec/lagarithrac.o
CC libavcodec/latm_parser.o
CXX libavcodec/libstagefright.o
/bin/sh: /home/user/android-ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux- x86/bin/arm-linux-androideabi-g++: cannot execute binary file
CC libavcodec/lcldec.o
common.mak:51: recipe for target `libavcodec/libstagefright.o' failed
make: *** [libavcodec/libstagefright.o] Error 126
make: *** Waiting for unfinished jobs....
PS: ffmpeg version is 1.0

Take a look at ffmpeg/config.log - there has to be an error description on the last line.
PS. On windows i used MinGW|MSYS to successfully compile ffmpeg

Android ndk-r8 "error trying to exec 'cc1plus': execvp: No such file or directory"

I am trying to use the Android NDK on Mountain Lion to build a library for Android, following this guide
http://masl.cis.gvsu.edu/2012/01/25/android-echoprint/
When it comes time to compile the library, I run:
cd <path to jni>
<ndk>/ndk-build
I get the following error:
Compile++ thumb : echoprint-jni <= AndroidCodegen.cpp
arm-linux-androideabi-g++: error trying to exec 'cc1plus': execvp: No such file or directory
make: *** [/Users/wingdom/Desktop/obj/local/armeabi/objs/echoprint-jni/AndroidCodegen.o] Error 1
I believe I have added everything I need to to my path variable:
export PATH=$PATH:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:Developer/android-sdk/tools:/Developer/android-sdk/platform-tools:/Developer/android-ndk:/Developer/android-ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86/bin
What else do I need to do in order to get this to compile? I am using the r8b NDK currently, but have tried it with versions all the way back to 6.
EDIT:
I tried this solution: Error while building android ndk sample project
adding
export PATH=$PATH:/usr/lib/i386-linux-gnu/gcc/i686-linux-gnu/4.5.2
to my path gets me this error:
cc1plus: error: unrecognized command line option "-mbionic"
cc1plus: error: unrecognized command line option "-mthumb"
cc1plus: error: unrecognized command line option "-mfpu=vfp"
/Users/wingdom/Desktop/jni/AndroidCodegen.cpp:1: error: bad value (armv5te) for -march= switch
/Users/wingdom/Desktop/jni/AndroidCodegen.cpp:1: error: bad value (xscale) for -mtune= switch
make: *** [/Users/wingdom/Desktop/obj/local/armeabi/objs/echoprint-jni/AndroidCodegen.o] Error 1
but adding
export CROSS_COMPILER=$PATH:/Developer/android-ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86/bin
doesn't help, like it did in the link above.

I have experienced same error.
I was not able to execute even 'gcc, g++' command. So I have googled a lot to find solution, but nothing helped for me.
Then, I found that some filename in ndk is not correct, with tailing _ on some filename.. (In my case, in toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86/arm-linux-androideabi/bin folder, there are gcc_, g++_, c++_ instead of gcc, g++, c++.)
I used The unarchiver to extract NDK archive, so I think there are something wrong with unarchiving procedure.
So I re-downloaded NDK and checked MD5 checksum, then extracted archive using Mac's default archive utility.
Now, the problem has solved.

Sounds like you have a bad download/unpack of the NDK. The cc1plus binary that it's looking for should be in $NDK_HOME/toolchains/arm-linux-androideabi-4.4.3/prebuilt/darwin-x86/libexec/gcc/arm-linux-androideabi/4.4.3/. If it's not there, try re-downloading the SDK and/or unpacking it again.
If it is there, be sure to build passing V=1 to ndk-build, and see if there are any odd -B options passed to the compiler. The -B option tells gcc where to find its "sub-programs" (of which cc1plus is one). Pretty sure there shouldn't be any on the command lines for r8, so if there are, something somewhere is passing bad flags. For example, on my system, a C++ NDK command line ends up looking something like this:
/opt/android-ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-g++ -MMD -MP -MF ./obj/local/armeabi-v7a/objs/sometarget/SomeCppFile.o.d -fpic -ffunction-sections -funwind-tables -fstack-protector -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -Wno-psabi -march=armv7-a -mfloat-abi=softfp -mfpu=vfp -fno-exceptions -fno-rtti -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -I/opt/android-ndk/sources/cxx-stl/stlport/stlport -I/opt/android-ndk/sources/cxx-stl//gabi++/include -DANDROID -Wall -Wa,--noexecstack -frtti -O2 -DNDEBUG -g -I/opt/android-ndk/platforms/android-8/arch-arm/usr/include -c jni/SomeCppFile.cpp -o ./obj/local/armeabi-v7a/objs/sometarget/SomeCppFile.o

Maybe you need to install the g++:
$sudo apt-get install g++

I have spent about a day to find root cause of this
arm-linux-androideabi-gcc: error trying to exec 'cc1': execvp: No such file...
and others issues.
The issues were that I unpacked NDK and SDK with 7z which removed executable permission for all binaries and Eclipse was not able to start cc1.
Once I unpacked tar files of SDK and NDK using tar, everything started working well.

Building native library with standalone toolchain android arm

I am trying to build libraw as a Android shared library. It looks the lib is too complex to use with Android.mk etc, or better: I am not capable yet of doing that.
I tried the route of using a standalone toolchain from the NDK, but I am getting stuck when compiling this lib.
This is the path I take to compile the lib. Please point out if I am making obvious errors:
I downloaded the ndk.
ran: make-standalone-toolchain.sh
Added the bin folder of that standalone toolchain as first item in my PATH.
Ran ./configure with --host=arm-linux-androideabi. This succeeded
Ran make, here it crashed very fast.
LibRaw-0.14.4$ make
depbase=`echo internal/dcraw_common.lo | sed 's|[^/]*$|.deps/&|;s|\.lo$||'`;\
/bin/bash ./libtool --tag=CXX --mode=compile arm-linux-androideabi-g++ -DPACKAGE_NAME=\"LibRaw\" -DPACKAGE_TARNAME=\"libraw\" -DPACKAGE_VERSION=\"0.14.4\" -DPACKAGE_STRING=\"LibRaw\ 0.14.4\" -DPACKAGE_BUGREPORT=\"info#libraw.org\" -DPACKAGE_URL=\"http://www.libraw.org\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -I. -I/usr/local/include -g -O2 -MT internal/dcraw_common.lo -MD -MP -MF $depbase.Tpo -c -o internal/dcraw_common.lo internal/dcraw_common.cpp &&\
mv -f $depbase.Tpo $depbase.Plo
libtool: compile: arm-linux-androideabi-g++ -DPACKAGE_NAME=\"LibRaw\" -DPACKAGE_TARNAME=\"libraw\" -DPACKAGE_VERSION=\"0.14.4\" "-DPACKAGE_STRING=\"LibRaw 0.14.4\"" -DPACKAGE_BUGREPORT=\"info#libraw.org\" -DPACKAGE_URL=\"http://www.libraw.org\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -I. -I/usr/local/include -g -O2 -MT internal/dcraw_common.lo -MD -MP -MF internal/.deps/dcraw_common.Tpo -c internal/dcraw_common.cpp -fPIC -DPIC -o internal/.libs/dcraw_common.o
internal/dcraw_common.cpp: In member function 'void LibRaw::read_shorts(ushort*, int)':
internal/dcraw_common.cpp:119: error: 'swab' was not declared in this scope
internal/dcraw_common.cpp: In member function 'void LibRaw::write_ppm_tiff()':
internal/dcraw_common.cpp:9235: error: 'swab' was not declared in this scope
make: *** [internal/dcraw_common.lo] Error 1
I doubt this error message is helpfull here at stackoverflow, but I am left wondering if I should have applied some additional flags or configuration to get this to work?
Note that I am able to compile this lib succesfully if just compiling for my system without crosscompiling. (linux 32bit).
When I am looking to a instruction for building GDAL for Android (here), it uses a additional setting of LIBS="-lsupc++ -lstdc++". This links the STL and C++ exceptions?
However, when I set those before running my configure I get immediately errors like:
configure:3018: checking whether the C++ compiler works
configure:3040: arm-linux-androideabi-g++ conftest.cpp -lsupc++ -lstdc++ >&5
/tmp/android-chain/bin/../lib/gcc/arm-linux-androideabi/4.4.3/../../../../arm-linux-androideabi/bin/ld: cannot find -lsupc++
collect2: ld returned 1 exit status
So, I am a bit stuck. Someone an idea?

I had to add an implementation of the swab function, since the NDK does not have that one.
Afterwards this compiled fine (but I used the crystax ndk).
A better way toolwise was to just use a Android.mk file and use ndk-build to compile it.

Linker error from the bottom of your question occurs because make-standalone-toolchain.sh from NDK r7 creates incomplete toolchain (it misses some libraries including libsupc++.a). I recommend you try making a toolchain from one of previous NDK releases (r6b should be fine).