编译Android版本FFmpeg 2.0小结

http://www.elesos.com/index.php?title=%E7%BC%96%E8%AF%91Android%E7%89%88%E6%9C%ACFFmpeg%E5%B0%8F%E7%BB%93

目录

 [隐藏] 

• 1 下载ndk
• 2 下载FFmpeg源代码
  • 2.1 修改configure文件
• 3 编译FFmpeg
• 4 配置FFmpeg库
• 5 如何在自己的工程中引用FFmpeg库
• 6 艺搜参考

下载ndk

此处下载的是android-ndk-r8e

官网上只有最新版下载链接，如果想要下载以前的版本，可打开https://archive.org/web/，然后输入

http://developer.android.com/tools/sdk/ndk/index.html

然后选择日期，比如2013年的6月。

解压/root/ffmpeg_compile/android-ndk-r8e，以$NDK代表此目录。

下载FFmpeg源代码

此处用的是ffmpeg-2.0.tar.bz2。解压到$NDK/sources目录下。得到$NDK/sources/ffmpeg-2.0目录。

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.

修改configure文件

找到

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.

改成

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

编译FFmpeg

复制下面内容，并保存为build_android.sh，然后放到$NDK/sources/ffmpeg-2.0目录下

#!/bin/bashNDK=/root/ffmpeg_compile/android-ndk-r8eSYSROOT=$NDK/platforms/android-9/arch-arm/TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.7/prebuilt/linux-x86_64function 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" \    $ADDITIONAL_CONFIGURE_FLAGmake cleanmakemake install}CPU=armPREFIX=$(pwd)/android/$CPU ADDI_CFLAGS="-marm"build_one

注意NDK，SYSROOT，TOOLCHAIN需要修改成你自己的路径。

如果脚本不能执行，执行：

yum install dos2unixdos2unix build_android.shchmod +x build_android.sh./build_android.sh

We disabled static library and enabled shared library. Note that the build script is not optimized for a particular CPU.

执行完成后，会输出到$NDK/sources/ffmpeg-2.0/android目录下，其中包含arm/lib and arm/include目录

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.

配置FFmpeg库

新建$NDK/sources/ffmpeg-2.0.1/android/arm/Android.mk

Android NDK allows us to reuse a compiled module through the “import-module” build command.

内容如下：

LOCAL_PATH:= $(call my-dir) include $(CLEAR_VARS)LOCAL_MODULE:= libavcodecLOCAL_SRC_FILES:= lib/libavcodec-55.soLOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/includeinclude $(PREBUILT_SHARED_LIBRARY) include $(CLEAR_VARS)LOCAL_MODULE:= libavformatLOCAL_SRC_FILES:= lib/libavformat-55.soLOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/includeinclude $(PREBUILT_SHARED_LIBRARY) include $(CLEAR_VARS)LOCAL_MODULE:= libswscaleLOCAL_SRC_FILES:= lib/libswscale-2.soLOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/includeinclude $(PREBUILT_SHARED_LIBRARY) include $(CLEAR_VARS)LOCAL_MODULE:= libavutilLOCAL_SRC_FILES:= lib/libavutil-52.soLOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/includeinclude $(PREBUILT_SHARED_LIBRARY) include $(CLEAR_VARS)LOCAL_MODULE:= libavfilterLOCAL_SRC_FILES:= lib/libavfilter-3.soLOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/includeinclude $(PREBUILT_SHARED_LIBRARY) include $(CLEAR_VARS)LOCAL_MODULE:= libwsresampleLOCAL_SRC_FILES:= lib/libswresample-0.soLOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/includeinclude $(PREBUILT_SHARED_LIBRARY)

如何在自己的工程中引用FFmpeg库

在jni目录下新建Android.mk，内容如下：

LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE    := ffcopyLOCAL_SRC_FILES := ffcopy.cLOCAL_LDLIBS := -llog -lz -landroidLOCAL_SHARED_LIBRARIES := libavformat libavcodec libswscale libavutil include $(BUILD_SHARED_LIBRARY)$(call import-module,ffmpeg-2.0/android/arm)

在jni目录下新建Application.mk，内容如下：

APP_ABI := armeabi  armeabi-v7aAPP_PLATFORM := android-8

android-8 corresponds to android SDK 2.2

然后运行ndk-build编译，在libs目录下会得到相应库。 在Java代码中引用方法：

static {        // 加载本地so库文件，注意顺序System.loadLibrary("avutil-52");System.loadLibrary("avcodec-55");System.loadLibrary("avformat-55");System.loadLibrary("swscale-2");        System.loadLibrary("ffcopy");            }

本文用到的部分文件下载：http://dl.vmall.com/c04w3kyzqt

艺搜参考

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

1个分类：

• FFmpeg编译

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