win7下编译android版ffmpeg

参考: http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/

ffmpeg用的是2.3.2版本。

困扰了很久，终于使用参考链接里的脚本成功编译了ffmpeg232版本，具体步骤为：

1. 下载ffmpeg源码并解压，我解压后的源码目录为：E:\android；（参考链接说需要放到ndk目录下的source目录下，实测表明不是必须的如此）

2. 安装MinGW； (1，2步参考http://blog.csdn.net/finewind/article/details/38854517，实际上我使用的也是当时编译VS版FFMPEG的环境)；

3. 下载android NDK，下载地址：http://developer.android.com/tools/sdk/ndk/index.html，要注意win7是32位版还是64位版，我下载的是android-ndk-r10d-windows-x86_64.exe

，双击解压，我最后把解压后的android-ndk-r10d文件夹放在E:\android下面；

4. 修改配置文件（参考链接里说需要修改配置文件，但我不修改也能成功编译）；

将以下内容:

SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'

修改为:

SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
SLIB_INSTALL_LINKS='$(SLIBNAME)'

5. 在ffmpeg源码目录下新建一个build_android.sh脚本，并输入如下内容：

NDK=E:/android/android-ndk-r9d
SYSROOT=$NDK/platforms/android-19/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows-x86_64
CPU=arm
PREFIX=$(pwd)/android/$CPU
ADDI_CFLAGS="-marm"function build_one
{
./configure \--prefix=$PREFIX \--enable-shared \--disable-static \--disable-doc \--disable-ffmpeg \--disable-ffplay \--disable-ffprobe \--disable-ffserver \--disable-avdevice \--disable-doc \--disable-symver \--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \--target-os=linux \--arch=arm \--enable-cross-compile \--sysroot=$SYSROOT \--extra-cflags="-Os -fpic $ADDI_CFLAGS" \--extra-ldflags="$ADDI_LDFLAGS"
make clean
make
make install
}
build_one

(注意不要直接从网页上复制这个脚本,如果直接从网页复制,有些行结尾会有2个空格,这会导致配置失败,可以用代码段上方的复制功能复制脚本)

6. 双击msys.bat，进入类linux shell界面(mysy在C:\MinGW\msys\1.0下)，然后跳转到ffmpeg源码目录下(cd E:/android/ffmpeg232/);先用chmod +x build_android.sh给build_android.sh增加执行权限,在输入build_android.sh,然后就静等ffmpeg编译完成.

以下是链接地址原文:

This is a updated post for a previous post, where we built ffmpeg 0.8 with Android NDK r5 and r6. This post will give instructions of how to build ffmpeg 2.0.1 with Android NDK r9.

0. Download Android NDK

The latest version of Android NDK can be downloaded at Android NDK website. At the time of writing, the newest version is NDK r9. Note that the website provides both current and legacy toolchains. We only need the current toolchain to compile ffmpeg.

After download NDK, simply decompress the archive. Note that we’ll use $NDK to represent the root path of the decompressed NDK.

1. Download ffmpeg source code

FFMPEG source code can be downloaded from the ffmpeg website. The latest stable release is 2.0.1. Download the source code and decompress it to $NDK/sources folder. We’ll discuss about the reason for doing this later.

2. Update configure file

Open ffmpeg-2.0.1/configure file with a text editor, and locate the following lines.

SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'

LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'

SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'

SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'

This cause ffmpeg shared libraries to be compiled to libavcodec.so.<version> (e.g. libavcodec.so.55), which is not compatible with Android build system. Therefore we’ll need to replace the above lines with the following lines.

SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'

LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'

SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'

SLIB_INSTALL_LINKS='$(SLIBNAME)'

3. Build ffmpeg

Copy the following text to a text editor and save it as build_android.sh.

#!/bin/bash

NDK=$HOME/Desktop/adt/android-ndk-r9

SYSROOT=$NDK/platforms/android-9/arch-arm/

TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64

function build_one

./configure \

    --prefix=$PREFIX \

    --enable-shared \

    --disable-static \

    --disable-doc \

    --disable-ffmpeg \

    --disable-ffplay \

    --disable-ffprobe \

    --disable-ffserver \

    --disable-avdevice \

    --disable-doc \

    --disable-symver \

    --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \

    --target-os=linux \

    --arch=arm \

    --enable-cross-compile \

    --sysroot=$SYSROOT \

    --extra-cflags="-Os -fpic $ADDI_CFLAGS" \

    --extra-ldflags="$ADDI_LDFLAGS" \

    $ADDITIONAL_CONFIGURE_FLAG

make clean

make

make install

CPU=arm

PREFIX=$(pwd)/android/$CPU

ADDI_CFLAGS="-marm"

build_one

We disabled static library and enabled shared library. Note that the build script is not optimized for a particular CPU. One should refer to ffmpeg documentation for detailed information about available configure options.

Once the file is saved, make sure the script is executable by the command below,

sudo chmod +x build_android.sh

Then execute the script by the command,

./build_android.sh

4. Build Output

The build can take a while to finish depending on your computer speed. Once it’s done, you should be able to find a folder $NDK/sources/ffmpeg-2.0.1/android, which contains arm/lib and arm/include folders.

The arm/lib folder contains the shared libraries, while arm/include folder contains the header files for libavcodec, libavformat, libavfilter, libavutil, libswscale etc.

Note that the arm/lib folder contains both the library files (e.g.: libavcodec-55.so) and symbolic links (e.g.: libavcodec.so) to them. We can remove the symbolic links to avoid confusion.

5. Make ffmpeg Libraries available for Your Projects

Now we’ve compiled the ffmpeg libraries and ready to use them. Android NDK allows us to reuse a compiled module through the import-module build command.

The reason we built our ffmpeg source code under $NDK/sources folder is that NDK build system will search for directories under this path for external modules automatically. To declare the ffmpeg libraries as reusable modules, we’ll need to add a file named $NDK/sources/ffmpeg-2.0.1/android/arm/Android.mk with the following content,

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE:= libavcodec

LOCAL_SRC_FILES:= lib/libavcodec-55.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE:= libavformat

LOCAL_SRC_FILES:= lib/libavformat-55.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE:= libswscale

LOCAL_SRC_FILES:= lib/libswscale-2.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE:= libavutil

LOCAL_SRC_FILES:= lib/libavutil-52.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE:= libavfilter

LOCAL_SRC_FILES:= lib/libavfilter-3.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE:= libwsresample

LOCAL_SRC_FILES:= lib/libswresample-0.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

Below is an example of how we can use the libraries in a Android project’s jni/Android.mk file,

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := tutorial03

LOCAL_SRC_FILES := tutorial03.c

LOCAL_LDLIBS := -llog -ljnigraphics -lz -landroid

LOCAL_SHARED_LIBRARIES := libavformat libavcodec libswscale libavutil

include $(BUILD_SHARED_LIBRARY)

$(call import-module,ffmpeg-2.0.1/android/arm)

Note that we called import-module with the relative path to $NDK/sources for the build system to locate the reusable ffmpeg libraries.

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