64位 CentOS NDK 编译 FFMPEG

64位 CentOS NDK 编译 FFMPEG

一、           参考文章：

http://www.cnblogs.com/baopu/p/4733029.html

http://www.cnblogs.com/wainiwann/p/3785485.html

二、 编译环境：

CentOS 10

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  
cp android-ndk-r8b-linux-x86.tar.bz2 /usr/local/lib  
//解压文件  
tar jxvf android-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

#NDK setting  
NDK_ROOT=/usr/local/lib/android-ndk-r8b  
export NDK_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 -xvjf ffmpeg-2.7.2.tar.bz2

cd ffmpeg-2.7.2

l  配置文件my-make.sh

gedit my-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

function build_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

make install

## end of my-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 +x my-make.sh

mkdir android/arm -p

./my-make.sh

最后就可以在android/arm下面：

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

bin include lib share

 

五、           Android使用编译好的so库

l  项目目录

l  Android.mk

 

LOCAL_PATH := $(call my-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)

l  Application.mk

 

APP_PLATFORM := android-17

APP_ABI := armeabi-v7a

APP_OPTIM := debug

APP_STL :=  gnustl_static

APP_CPPFLAGS += -fexceptions

APP_CPPFLAGS += -frtti

 

l  FFmpegNative.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,

jobject thiz )

{

char str[25];

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

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

}

l  MainActivity.java

 

 

package com.example.ffmpegtst;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.widget.TextView;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

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

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

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

return true;

}

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");

}

public native String  stringFromJNI();

}

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: dlopen failed: cannot locate symbol "atof" referenced by "libavformat-56.so"...

W/dalvikvm(31393): Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lcom/az/ffmpegapp/FFmpegNative;

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

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

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

W/ActivityManager( 834): Force finishing activity com.az.ffmpegapp/.MainActivity