您的位置：首页 > 运维架构 > Linux

64位 CentOS NDK 编译 FFMPEG

2015-08-04 11:14 639 查看

64位CentOSNDK编译FFMPEG

一、参考文章：

/article/5394810.html

/article/4814143.html

二、编译环境：

CentOS10

工具包：

NDK：https://dl.google.com/android/ndk/android-ndk32-r10b-linux-x86_64.tar.bz2

SDK：https://dl.google.com/android/adt/adt-bundle-linux-x86_64-20140702.zip

Ffmpeg:http://ffmpeg.org/releases/ffmpeg-2.7.2.tar.bz2

三、NDK的安装

l下载：https://dl.google.com/android/ndk/android-ndk32-r10b-linux-x86_64.tar.bz2

l解压

//复制文件

cpandroid-ndk-r8b-linux-x86.tar.bz2/usr/local/lib

//解压文件

tarjxvfandroid-ndk-r8b-linux-x86.tar.bz2

l修改环境变量

终端运行：gedit
~/.bashrc

将下面的语句加入

#NDKsetting

NDK_ROOT=/usr/local/lib/android-ndk-r8b

exportNDK_ROOT

保存，终端运行：source~/.bashrc

使之立即生效。

在终端运行：echo$NDK_ROOT

若正确打印了NDK的路径，说明环境变量修改成功。

l测试

cd进入android-ndk-r8b/samples/hello-jni，然后在终端运行ndk的编译脚本：

sudo
/usr/local/lib/android-ndk-r8b/ndk-build

若结果如下图，则ndk安装成功。

四、
编译FFMPEG

l解压

tar-xvjfffmpeg-2.7.2.tar.bz2

cdffmpeg-2.7.2

l配置文件my-make.sh

geditmy-make.sh

将下面的代码拷贝到my-make.sh中

#!/bin/bash

NDK=/opt/adrd-stuff/android-ndk-r10b

SYSROOT=$NDK/platforms/android-19/arch-arm

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

functionbuild_one

{

./configure\

--prefix=$PREFIX\

--enable-shared\

--disable-static\

--disable-doc\

--disable-ffserver\

--enable-cross-compile\

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

--target-os=linux\

--arch=arm\

--sysroot=$SYSROOT\

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

--extra-ldflags="$ADDI_LDFLAGS"\

$ADDITIONAL_CONFIGURE_FLAG

}

CPU=arm

PREFIX=$(pwd)/android/$CPU

ADDI_CFLAGS="-marm"

build_one

make-j8

makeinstall

##endofmy-make.sh

l修改文件configure

很多ffmpeg编译资料上面说要修改configure文件，说的原因是如果不修改的话，在android上
System.loadLibrary("xxx");的时候个别so库无法加载的问题。

打开ffmpeg源码内configure文件进行如下修改：

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)'

替换为：

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

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

SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'

SLIB_INSTALL_LINKS='$(SLIBNAME)'

l编译

chmod+xmy-make.sh

mkdirandroid/arm-p

./my-make.sh

最后就可以在android/arm下面：

~~~~~~~~~~~/android/arm$ls

binincludelibshare

五、Android使用编译好的so库

l项目目录

lAndroid.mk

LOCAL_PATH:=$(callmy-dir)

include$(CLEAR_VARS)

LOCAL_MODULE:=avcodec-56-prebuilt

LOCAL_SRC_FILES:=ffmpeg/lib/libavcodec-56.so

include$(PREBUILT_SHARED_LIBRARY)

include$(CLEAR_VARS)

LOCAL_MODULE:=avdevice-56-prebuilt

LOCAL_SRC_FILES:=ffmpeg/lib/libavdevice-56.so

include$(PREBUILT_SHARED_LIBRARY)

include$(CLEAR_VARS)

LOCAL_MODULE:=avfilter-5-prebuilt

LOCAL_SRC_FILES:=ffmpeg/lib/libavfilter-5.so

include$(PREBUILT_SHARED_LIBRARY)

include$(CLEAR_VARS)

LOCAL_MODULE:=avformat-56-prebuilt

LOCAL_SRC_FILES:=ffmpeg/lib/libavformat-56.so

include$(PREBUILT_SHARED_LIBRARY)

include$(CLEAR_VARS)

LOCAL_MODULE:=avutil-54-prebuilt

LOCAL_SRC_FILES:=ffmpeg/lib/libavutil-54.so

include$(PREBUILT_SHARED_LIBRARY)

include$(CLEAR_VARS)

LOCAL_MODULE:=avswresample-1-prebuilt

LOCAL_SRC_FILES:=ffmpeg/lib/libswresample-1.so

include$(PREBUILT_SHARED_LIBRARY)

include$(CLEAR_VARS)

LOCAL_MODULE:=swscale-3-prebuilt

LOCAL_SRC_FILES:=ffmpeg/lib/libswscale-3.so

include$(PREBUILT_SHARED_LIBRARY)

include$(CLEAR_VARS)

LOCAL_MODULE:=ffmpeg_codec

LOCAL_SRC_FILES:=FFmpegNative.c

LOCAL_LDLIBS:=-llog#-ljnigraphics-lz-landroid

LOCAL_C_INCLUDES+=$(LOCAL_PATH)/ffmpeg/include

LOCAL_SHARED_LIBRARIES:=\

avcodec-56-prebuilt\

avdevice-56-prebuilt\

avfilter-5-prebuilt\

avformat-56-prebuilt\

avutil-54-prebuilt

include$(BUILD_SHARED_LIBRARY)

lApplication.mk

APP_PLATFORM:=android-17

APP_ABI:=armeabi-v7a

APP_OPTIM:=debug

APP_STL:=gnustl_static

APP_CPPFLAGS+=-fexceptions

APP_CPPFLAGS+=-frtti

lFFmpegNative.c

#include<jni.h>

#include"libavcodec/avcodec.h"

#include"libavutil/imgutils.h"

#include"libavutil/samplefmt.h"

#include"libavutil/timestamp.h"

#include"libavformat/avformat.h"

jstring

Java_com_example_ffmpegtst_MainActivity_stringFromJNI(JNIEnv*env,

jobjectthiz)

{

charstr[25];

sprintf(str,"%d",avcodec_version());

return(*env)->NewStringUTF(env,str);

}

lMainActivity.java

packagecom.example.ffmpegtst;

importandroid.app.Activity;

importandroid.os.Bundle;

importandroid.view.Menu;

importandroid.widget.TextView;

publicclassMainActivityextendsActivity{

@Override

protectedvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

((TextView)findViewById(R.id.hello_jni)).setText(stringFromJNI());

}

@Override

publicbooleanonCreateOptionsMenu(Menumenu){

//Inflatethemenu;thisaddsitemstotheactionbarifitispresent.

getMenuInflater().inflate(R.menu.main,menu);

returntrue;

}

static{

System.loadLibrary("avutil-54");

System.loadLibrary("avcodec-56");

System.loadLibrary("swresample-1");

System.loadLibrary("avformat-56");

System.loadLibrary("swscale-3");

System.loadLibrary("avfilter-5");

System.loadLibrary("ffmpeg_codec");

}

publicnativeStringstringFromJNI();

}

六、注意：

NDK版本：

32bits小机用：android-ndk32-r10b-linux-x86_64.tar.bz2

64bits小机用：android-ndk64-r10b-linux-x86_64.tar.bz2

64bits编译出来的APK在S3上面运行，会有闪退的现象，

E/dalvikvm(31393):dlopen("/data/app-lib/com.az.ffmpegapp-1/libavformat-56.so")failed:dlopenfailed:cannotlocatesymbol"atof"referencedby"libavformat-56.so"...

W/dalvikvm(31393):ExceptionLjava/lang/UnsatisfiedLinkError;thrownwhileinitializingLcom/az/ffmpegapp/FFmpegNative;

E/AndroidRuntime(31393):Process:com.az.ffmpegapp,PID:31393

E/AndroidRuntime(31393):atcom.az.ffmpegapp.FFmpegNative.<clinit>(FFmpegNative.java:7)

E/AndroidRuntime(31393):atcom.az.ffmpegapp.MainActivity.onCreate(MainActivity.java:15)

W/ActivityManager(834):Forcefinishingactivitycom.az.ffmpegapp/.MainActivity

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航