macos编译opencv+contrib+nonfree 4.2 for android

到处找编译命令，结果官方自带的有编译脚本。记录一下，免得下次又到处找！！！

# 直接使用python2 执行build_sdk.py脚本。➜  build python2.7 ../opencv-4.2.0/platforms/android/build_sdk.py --extra_modules_path ../opencv_contrib-4.2.0/modules

建议：如果你和我一样，也打算使用SIFT之类的算法，要修改build_sdk.py，在里面添加 OPENCV_ENABLE_NONFREE="ON"。建议关闭掉TBB和IPP：WITH_TBB="OFF"，android使用不到这个。

我的配置是：

#!/usr/bin/env python2.7import os, sysimport argparseimport globimport reimport shutilimport subprocessimport timeimport logging as logimport xml.etree.ElementTree as ETSCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))class Fail(Exception):    def __init__(self, text=None):        self.t = text    def __str__(self):        return "ERROR" if self.t is None else self.tdef execute(cmd, shell=False):    try:        log.debug("Executing: %s" % cmd)        log.info('Executing: ' + ' '.join(cmd))        retcode = subprocess.call(cmd, shell=shell)        if retcode < 0:            raise Fail("Child was terminated by signal: %s" % -retcode)        elif retcode > 0:            raise Fail("Child returned: %s" % retcode)    except OSError as e:        raise Fail("Execution failed: %d / %s" % (e.errno, e.strerror))def rm_one(d):    d = os.path.abspath(d)    if os.path.exists(d):        if os.path.isdir(d):            log.info("Removing dir: %s", d)            shutil.rmtree(d)        elif os.path.isfile(d):            log.info("Removing file: %s", d)            os.remove(d)def check_dir(d, create=False, clean=False):    d = os.path.abspath(d)    log.info("Check dir %s (create: %s, clean: %s)", d, create, clean)    if os.path.exists(d):        if not os.path.isdir(d):            raise Fail("Not a directory: %s" % d)        if clean:            for x in glob.glob(os.path.join(d, "*")):                rm_one(x)    else:        if create:            os.makedirs(d)    return ddef check_executable(cmd):    try:        log.debug("Executing: %s" % cmd)        result = subprocess.check_output(cmd, stderr=subprocess.STDOUT)        log.debug("Result: %s" % (result+'\n').split('\n')[0])        return True    except Exception as e:        log.debug('Failed: %s' % e)        return Falsedef determine_opencv_version(version_hpp_path):    # version in 2.4 - CV_VERSION_EPOCH.CV_VERSION_MAJOR.CV_VERSION_MINOR.CV_VERSION_REVISION    # version in master - CV_VERSION_MAJOR.CV_VERSION_MINOR.CV_VERSION_REVISION-CV_VERSION_STATUS    with open(version_hpp_path, "rt") as f:        data = f.read()        major = re.search(r'^#define\W+CV_VERSION_MAJOR\W+(\d+)$', data, re.MULTILINE).group(1)        minor = re.search(r'^#define\W+CV_VERSION_MINOR\W+(\d+)$', data, re.MULTILINE).group(1)        revision = re.search(r'^#define\W+CV_VERSION_REVISION\W+(\d+)$', data, re.MULTILINE).group(1)        version_status = re.search(r'^#define\W+CV_VERSION_STATUS\W+"([^"]*)"$', data, re.MULTILINE).group(1)        return "%(major)s.%(minor)s.%(revision)s%(version_status)s" % locals()# shutil.move fails if dst existsdef move_smart(src, dst):    def move_recurse(subdir):        s = os.path.join(src, subdir)        d = os.path.join(dst, subdir)        if os.path.exists(d):            if os.path.isdir(d):                for item in os.listdir(s):                    move_recurse(os.path.join(subdir, item))            elif os.path.isfile(s):                shutil.move(s, d)        else:            shutil.move(s, d)    move_recurse('')# shutil.copytree fails if dst existsdef copytree_smart(src, dst):    def copy_recurse(subdir):        s = os.path.join(src, subdir)        d = os.path.join(dst, subdir)        if os.path.exists(d):            if os.path.isdir(d):                for item in os.listdir(s):                    copy_recurse(os.path.join(subdir, item))            elif os.path.isfile(s):                shutil.copy2(s, d)        else:            if os.path.isdir(s):                shutil.copytree(s, d)            elif os.path.isfile(s):                shutil.copy2(s, d)    copy_recurse('')#===================================================================================================class ABI:    def __init__(self, platform_id, name, toolchain, ndk_api_level = None, cmake_vars = dict()):        self.platform_id = platform_id # platform code to add to apk version (for cmake)        self.name = name # general name (official Android ABI identifier)        self.toolchain = toolchain # toolchain identifier (for cmake)        self.cmake_vars = dict(            ANDROID_STL="gnustl_static",            ANDROID_ABI=self.name,            ANDROID_PLATFORM_ID=platform_id,        )        if toolchain is not None:            self.cmake_vars['ANDROID_TOOLCHAIN_NAME'] = toolchain        else:            self.cmake_vars['ANDROID_TOOLCHAIN'] = 'clang'            self.cmake_vars['ANDROID_STL'] = 'c++_shared'        if ndk_api_level:            self.cmake_vars['ANDROID_NATIVE_API_LEVEL'] = ndk_api_level        self.cmake_vars.update(cmake_vars)    def __str__(self):        return "%s (%s)" % (self.name, self.toolchain)    def haveIPP(self):        return self.name == "x86" or self.name == "x86_64"#===================================================================================================class Builder:    def __init__(self, workdir, opencvdir, config):        self.workdir = check_dir(workdir, create=True)        self.opencvdir = check_dir(opencvdir)        self.config = config        self.libdest = check_dir(os.path.join(self.workdir, "o4a"), create=True, clean=True)        self.resultdest = check_dir(os.path.join(self.workdir, 'OpenCV-android-sdk'), create=True, clean=True)        self.docdest = check_dir(os.path.join(self.workdir, 'OpenCV-android-sdk', 'sdk', 'java', 'javadoc'), create=True, clean=True)        self.extra_packs = []        self.opencv_version = determine_opencv_version(os.path.join(self.opencvdir, "modules", "core", "include", "opencv2", "core", "version.hpp"))        self.use_ccache = False if config.no_ccache else True        self.cmake_path = self.get_cmake()        self.ninja_path = self.get_ninja()        self.debug = True if config.debug else False        self.debug_info = True if config.debug_info else False        self.no_samples_build = True if config.no_samples_build else False    def get_cmake(self):        if not self.config.use_android_buildtools and check_executable(['cmake', '--version']):            log.info("Using cmake from PATH")            return 'cmake'        # look to see if Android SDK's cmake is installed        android_cmake = os.path.join(os.environ['ANDROID_SDK'], 'cmake')        if os.path.exists(android_cmake):            cmake_subdirs = [f for f in os.listdir(android_cmake) if check_executable([os.path.join(android_cmake, f, 'bin', 'cmake'), '--version'])]            if len(cmake_subdirs) > 0:                # there could be more than one - just take the first one                cmake_from_sdk = os.path.join(android_cmake, cmake_subdirs[0], 'bin', 'cmake')                log.info("Using cmake from Android SDK: %s", cmake_from_sdk)                return cmake_from_sdk        raise Fail("Can't find cmake")    def get_ninja(self):        if not self.config.use_android_buildtools and check_executable(['ninja', '--version']):            log.info("Using ninja from PATH")            return 'ninja'        # Android SDK's cmake includes a copy of ninja - look to see if its there        android_cmake = os.path.join(os.environ['ANDROID_SDK'], 'cmake')        if os.path.exists(android_cmake):            cmake_subdirs = [f for f in os.listdir(android_cmake) if check_executable([os.path.join(android_cmake, f, 'bin', 'ninja'), '--version'])]            if len(cmake_subdirs) > 0:                # there could be more than one - just take the first one                ninja_from_sdk = os.path.join(android_cmake, cmake_subdirs[0], 'bin', 'ninja')                log.info("Using ninja from Android SDK: %s", ninja_from_sdk)                return ninja_from_sdk        raise Fail("Can't find ninja")    def get_toolchain_file(self):        if not self.config.force_opencv_toolchain:            toolchain = os.path.join(os.environ['ANDROID_NDK'], 'build', 'cmake', 'android.toolchain.cmake')            if os.path.exists(toolchain):                return toolchain        toolchain = os.path.join(SCRIPT_DIR, "android.toolchain.cmake")        if os.path.exists(toolchain):            return toolchain        else:            raise Fail("Can't find toolchain")    def get_engine_apk_dest(self, engdest):        return os.path.join(engdest, "platforms", "android", "service", "engine", ".build")    def add_extra_pack(self, ver, path):        if path is None:            return        self.extra_packs.append((ver, check_dir(path)))    def clean_library_build_dir(self):        for d in ["CMakeCache.txt", "CMakeFiles/", "bin/", "libs/", "lib/", "package/", "install/samples/"]:            rm_one(d)    def build_library(self, abi, do_install):        cmd = [self.cmake_path, "-GNinja"]        cmake_vars = dict(            CMAKE_TOOLCHAIN_FILE=self.get_toolchain_file(),            INSTALL_CREATE_DISTRIB="ON",            WITH_OPENCL="OFF",            WITH_IPP="OFF",  # 不需要            WITH_TBB="OFF",  # 不需要            OPENCV_ENABLE_NONFREE="ON",   # SIFT等需要这个配置            BUILD_EXAMPLES="OFF",            BUILD_TESTS="OFF",            BUILD_PERF_TESTS="OFF",            BUILD_DOCS="OFF",            BUILD_ANDROID_EXAMPLES=("OFF" if self.no_samples_build else "ON"),            INSTALL_ANDROID_EXAMPLES="ON",        )        if self.ninja_path != 'ninja':            cmake_vars['CMAKE_MAKE_PROGRAM'] = self.ninja_path        if self.debug:            cmake_vars['CMAKE_BUILD_TYPE'] = "Debug"        if self.debug_info:  # Release with debug info            cmake_vars['BUILD_WITH_DEBUG_INFO'] = "ON"        if self.config.extra_modules_path is not None:            cmd.append("-DOPENCV_EXTRA_MODULES_PATH='%s'" % self.config.extra_modules_path)        if self.use_ccache == True:            cmd.append("-DNDK_CCACHE=ccache")        if do_install:            cmd.extend(["-DBUILD_TESTS=ON", "-DINSTALL_TESTS=ON"])        cmake_vars.update(abi.cmake_vars)        cmd += [ "-D%s='%s'" % (k, v) for (k, v) in cmake_vars.items() if v is not None]        cmd.append(self.opencvdir)        execute(cmd)        # full parallelism for C++ compilation tasks        execute([self.ninja_path, "opencv_modules"])        # limit parallelism for building samples (avoid huge memory consumption)        if self.no_samples_build:            execute([self.ninja_path, "install" if (self.debug_info or self.debug) else "install/strip"])        else:            execute([self.ninja_path, "-j1" if (self.debug_info or self.debug) else "-j3", "install" if (self.debug_info or self.debug) else "install/strip"])    def build_javadoc(self):        classpaths = []        for dir, _, files in os.walk(os.environ["ANDROID_SDK"]):            for f in files:                if f == "android.jar" or f == "annotations.jar":                    classpaths.append(os.path.join(dir, f))        srcdir = os.path.join(self.resultdest, 'sdk', 'java', 'src')        dstdir = self.docdest        # synchronize with modules/java/jar/build.xml.in        shutil.copy2(os.path.join(SCRIPT_DIR, '../../doc/mymath.js'), dstdir)        cmd = [            "javadoc",            '-windowtitle', 'OpenCV %s Java documentation' % self.opencv_version,            '-doctitle', 'OpenCV Java documentation (%s)' % self.opencv_version,            "-nodeprecated",            "-public",            '-sourcepath', srcdir,            '-encoding', 'UTF-8',            '-charset', 'UTF-8',            '-docencoding', 'UTF-8',            '--allow-script-in-comments',            '-header','''            ''' % 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0',            '-bottom', 'Generated on %s / OpenCV %s' % (time.strftime("%Y-%m-%d %H:%M:%S"), self.opencv_version),            "-d", dstdir,            "-classpath", ":".join(classpaths),            '-subpackages', 'org.opencv',        ]        execute(cmd)    def gather_results(self):        # Copy all files        root = os.path.join(self.libdest, "install")        for item in os.listdir(root):            src = os.path.join(root, item)            dst = os.path.join(self.resultdest, item)            if os.path.isdir(src):                log.info("Copy dir: %s", item)                if self.config.force_copy:                    copytree_smart(src, dst)                else:                    move_smart(src, dst)            elif os.path.isfile(src):                log.info("Copy file: %s", item)                if self.config.force_copy:                    shutil.copy2(src, dst)                else:                    shutil.move(src, dst)#===================================================================================================if __name__ == "__main__":    parser = argparse.ArgumentParser(description='Build OpenCV for Android SDK')    parser.add_argument("work_dir", nargs='?', default='.', help="Working directory (and output)")    parser.add_argument("opencv_dir", nargs='?', default=os.path.join(SCRIPT_DIR, '../..'), help="Path to OpenCV source dir")    parser.add_argument('--config', default='ndk-18-api-level-21.config.py', type=str, help="Package build configuration", )    parser.add_argument('--ndk_path', help="Path to Android NDK to use for build")    parser.add_argument('--sdk_path', help="Path to Android SDK to use for build")    parser.add_argument('--use_android_buildtools', action="store_true", help='Use cmake/ninja build tools from Android SDK')    parser.add_argument("--extra_modules_path", help="Path to extra modules to use for build")    parser.add_argument('--sign_with', help="Certificate to sign the Manager apk")    parser.add_argument('--build_doc', action="store_true", help="Build javadoc")    parser.add_argument('--no_ccache', action="store_true", help="Do not use ccache during library build")    parser.add_argument('--force_copy', action="store_true", help="Do not use file move during library build (useful for debug)")    parser.add_argument('--force_opencv_toolchain', action="store_true", help="Do not use toolchain from Android NDK")    parser.add_argument('--debug', action="store_true", help="Build 'Debug' binaries (CMAKE_BUILD_TYPE=Debug)")    parser.add_argument('--debug_info', action="store_true", help="Build with debug information (useful for Release mode: BUILD_WITH_DEBUG_INFO=ON)")    parser.add_argument('--no_samples_build', action="store_true", help="Do not build samples (speeds up build)")    args = parser.parse_args()    log.basicConfig(format='%(message)s', level=log.DEBUG)    log.debug("Args: %s", args)    if args.ndk_path is not None:        os.environ["ANDROID_NDK"] = args.ndk_path    if args.sdk_path is not None:        os.environ["ANDROID_SDK"] = args.sdk_path    if not 'ANDROID_HOME' in os.environ and 'ANDROID_SDK' in os.environ:        os.environ['ANDROID_HOME'] = os.environ["ANDROID_SDK"]    if not 'ANDROID_SDK' in os.environ:        raise Fail("SDK location not set. Either pass --sdk_path or set ANDROID_SDK environment variable")    # look for an NDK installed with the Android SDK    if not 'ANDROID_NDK' in os.environ and 'ANDROID_SDK' in os.environ and os.path.exists(os.path.join(os.environ["ANDROID_SDK"], 'ndk-bundle')):        os.environ['ANDROID_NDK'] = os.path.join(os.environ["ANDROID_SDK"], 'ndk-bundle')    if not 'ANDROID_NDK' in os.environ:        raise Fail("NDK location not set. Either pass --ndk_path or set ANDROID_NDK environment variable")    if not check_executable(['ccache', '--version']):        log.info("ccache not found - disabling ccache support")        args.no_ccache = True    if os.path.realpath(args.work_dir) == os.path.realpath(SCRIPT_DIR):        raise Fail("Specify workdir (building from script directory is not supported)")    if os.path.realpath(args.work_dir) == os.path.realpath(args.opencv_dir):        raise Fail("Specify workdir (building from OpenCV source directory is not supported)")    # Relative paths become invalid in sub-directories    if args.opencv_dir is not None and not os.path.isabs(args.opencv_dir):        args.opencv_dir = os.path.abspath(args.opencv_dir)    if args.extra_modules_path is not None and not os.path.isabs(args.extra_modules_path):        args.extra_modules_path = os.path.abspath(args.extra_modules_path)    cpath = args.config    if not os.path.exists(cpath):        cpath = os.path.join(SCRIPT_DIR, cpath)        if not os.path.exists(cpath):            raise Fail('Config "%s" is missing' % args.config)    with open(cpath, 'r') as f:        cfg = f.read()    print("Package configuration:")    print('=' * 80)    print(cfg.strip())    print('=' * 80)    ABIs = None  # make flake8 happy    exec(compile(cfg, cpath, 'exec'))    log.info("Android NDK path: %s", os.environ["ANDROID_NDK"])    log.info("Android SDK path: %s", os.environ["ANDROID_SDK"])    builder = Builder(args.work_dir, args.opencv_dir, args)    log.info("Detected OpenCV version: %s", builder.opencv_version)    for i, abi in enumerate(ABIs):        do_install = (i == 0)        log.info("=====")        log.info("===== Building library for %s", abi)        log.info("=====")        os.chdir(builder.libdest)        builder.clean_library_build_dir()        builder.build_library(abi, do_install)    builder.gather_results()    if args.build_doc:        builder.build_javadoc()    log.info("=====")    log.info("===== Build finished")    log.info("=====")    log.info("SDK location: %s", builder.resultdest)    log.info("Documentation location: %s", builder.docdest)

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