在Android的NDK编译fftw3 [英] compiling fftw3 in android ndk

问题描述

您好，我是新来的Andr​​oid NDK到目前为止，我与所有示例应用程序工作的Andr​​oid NDK，现在我想端口fftw3库在Android中，你可以PLZ建议我这方面的任何教程。

hi i am new to android-ndk so far i worked with all sample applications in android-ndk,now i am trying to port fftw3 library in android, can you plz suggest me any tutorial for this.

感谢。

推荐答案

该FFTW3构建系统利用自动工具，让你无法与Android NDK直接使用它。
一个好的博客文章处理这个问题是<一个href=\"http://warpedtimes.word$p$pss.com/2010/02/03/building-open-source-libraries-with-android-ndk/\">here.

The FFTW3 build system makes use of Autotools, so that you can not use it directly with the Android NDK. A good blog post dealing with this issue is here.

我们的想法是生成正确的的config.h 文件离线和创造的Andr​​oid的Makefile，取代通常由自动工具产生的。没有的部分。

The idea is to generate a proper config.h file offline and to create Android Makefiles, which replace the missing ones normally generated by the Autotools.

要实现不同的本地模块的模块化布局，你可以使用，我提出以下建议：

To achieve a modular layout for the different native modules you might use, I'd recommend the following:

在您的顶级 JNI / 目录将这两个文件：

In your top jni/ directory put these two files:

Application.mk ：

    APP_OPTIM        := release
    APP_ABI          := armeabi armeabi-v7a
    APP_MODULES      := fftw3

Android.mk ：

    TOP_DIR := $(call my-dir)
    include $(TOP_DIR)/fftw3/project/jni/Android.mk

这种方式，你可以很容易地创建一个 JNI / new_module_name 目录，然后将添加一个新的模块 new_module_name 来在 APP_MODULES 列表。

This way you can easily add a new module by creating a jni/new_module_name directory and then adding new_module_name to the APP_MODULES list.

然后创建一个新的 JNI / fftw3 目录，并把另一个 Application.mk 有：

Then create a new jni/fftw3 directory and put another Application.mk there:

Application.mk ：

    APP_PROJECT_PATH := $(call my-dir)/project
    APP_MODULES      += fftw3
    APP_OPTIM        := release
    APP_ABI          := armeabi armeabi-v7a

然后把原来的FFTW3包下 JNI / fftw3 /项目/ JNI 。

在这一点上，你需要生成一个的config.h 。您可以通过使用一个小的shell脚本如这做到这一点。

At this point you need to generate a config.h. You can do this by using a small shell script like this.

最后一步是创建所需的Andr​​oid Makefile文件。在 JNI / fftw3 /项目/ JNI 把顶部 Android.mk ：

The last step is to create the needed Android Makefile. In jni/fftw3/project/jni put a top Android.mk:

    LOCAL_PATH := $(call my-dir)
    include $(CLEAR_VARS)

    include $(LOCAL_PATH)/api/sources.mk
    include $(LOCAL_PATH)/dft/sources.mk
    include $(LOCAL_PATH)/dft/scalar/sources.mk
    include $(LOCAL_PATH)/dft/scalar/codelets/sources.mk
    include $(LOCAL_PATH)/kernel/sources.mk
    include $(LOCAL_PATH)/rdft/sources.mk
    include $(LOCAL_PATH)/rdft/scalar/sources.mk
    include $(LOCAL_PATH)/rdft/scalar/r2cb/sources.mk
    include $(LOCAL_PATH)/rdft/scalar/r2cf/sources.mk
    include $(LOCAL_PATH)/rdft/scalar/r2r/sources.mk
    include $(LOCAL_PATH)/reodft/sources.mk

    LOCAL_MODULE := fftw3
    LOCAL_C_INCLUDES := $(LOCAL_PATH) \
        $(LOCAL_PATH)/api \
        $(LOCAL_PATH)/dft \
        $(LOCAL_PATH)/dft/scalar \
        $(LOCAL_PATH)/dft/scalar/codelets \
        $(LOCAL_PATH)/kernel \
        $(LOCAL_PATH)/rdft \
        $(LOCAL_PATH)/rdft/scalar \
        $(LOCAL_PATH)/rdft/scalar/r2cb \
        $(LOCAL_PATH)/rdft/scalar/r2cf \
        $(LOCAL_PATH)/rdft/scalar/r2r \
        $(LOCAL_PATH)/reodft

    # Use APP_OPTIM in Application.mk
    LOCAL_CFLAGS := -g

    include $(BUILD_SHARED_LIBRARY)

现在你必须创建所有这些 sources.mk 文件FROW。
例如。一个典型的 sources.mk 是这样的：

Frow now on you have to create all these sources.mk files. E.g. a typical sources.mk looks like this:

RDFT / sources.mk ：

    sources = buffered2.c \
              buffered.c \
              <....>
              vrank-geq1.c \
              vrank-geq1-rdft2.c

    LOCAL_SRC_FILES += $(sources:%=rdft/%)

调用 NDK的构建脚本在您的应用程序的顶级目录，你应该有两个现成的使用FFTW3库结束：

Call the ndk-build script in the top directory of your app and you should end up with two ready-to-use FFTW3 libraries:

• 库/ armeabi-V7A / libfftw3.so


• 库/ armeabi / libfftw3.so

• libs/armeabi-v7a/libfftw3.so
• libs/armeabi/libfftw3.so

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