ubantu android编译环境 编译安卓x86

看了一下网络上的文章大多都是在windows环境下编译android的ffmpeg的

我跟着操作了一遍，发现windows下编译ffmpeg
其实就是安装了Ubuntu的linux的虚拟机
然后把资源放到虚拟机上进行编译
最后把编译好的so库再拷贝回到windows环境下使用

这里我就总结一下mac电脑编译ffmpeg的过程，因为mac就是unix系统的
这系统的源头和linux是一家的，所以环境本来就是对的

最大的好处是不需要装Ubuntu的虚拟机器 和把文件拷贝来拷贝去

1、下载FFmpeg源码（v3.3.8）

下载后记得要解压
然后打开ffmpeg-3.3.8/configure
修改其中一段代码 3305行左右

#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)’

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

修改完后记得保存一下

下载NDK（r14b）

找到android编译的脚本

build_android.sh 拖到ffmpeg-3.3.8 文件夹里面

修改一下里面的脚本参数

export NDK_HOME=/usr/work/android-ndk-r14b
改成自己下载的ndk的路径
export NDK_HOME=/Users/xxx/Library/Android/android-ndk-r14b

TOOLCHAIN=$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
需要改一下 改成苹果电脑的
TOOLCHAIN=$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64

TOOLCHAIN=$NDK_HOME/toolchains/x86-4.9/prebuilt/linux-x86_64
也改成苹果电脑的
TOOLCHAIN=$NDK_HOME/toolchains/x86-4.9/prebuilt/darwin-x86_64

其余就不需要修改了

到了最终的编译环节
1、执行configure文件生成makefile文件

chmod u+x configure(修改权限)
./configure(执行脚本)

2、执行android编译脚本

chmod u+x build_android.sh(修改权限)
./build_android.sh(执行脚本)

编译成功后的样子

build_android.sh

#!/bin/bash
export NDK_HOME=/
XXX/android/android-ndk-r14b
export PLATFORM_VERSION=android-9
function build
{
	echo "start build ffmpeg for $ARCH"
	./configure --target-os=linux \
	--prefix=$PREFIX --arch=$ARCH \
	--disable-doc \
	--enable-shared \
	--disable-static \
	--disable-yasm \
	--disable-asm \
	--disable-symver \
	--enable-gpl \
	--disable-ffmpeg \
	--disable-ffplay \
	--disable-ffprobe \
	--disable-ffserver \
	--cross-prefix=$CROSS_COMPILE \
	--enable-cross-compile \
	--sysroot=$SYSROOT \
	--enable-small \
	--extra-cflags="-Os -fpic $ADDI_CFLAGS" \
	--extra-ldflags="$ADDI_LDFLAGS" \
	$ADDITIONAL_CONFIGURE_FLAG
	make clean
	make
	make install
	echo "build ffmpeg for $ARCH finished"
}

#arm
ARCH=arm
CPU=arm
PREFIX=$(pwd)/android/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
CROSS_COMPILE=$TOOLCHAIN/bin/arm-linux-androideabi-
ADDI_CFLAGS="-marm"
SYSROOT=$NDK_HOME/platforms/$PLATFORM_VERSION/arch-$ARCH/
build

#x86
ARCH=x86
CPU=x86
PREFIX=$(pwd)/android/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/x86-4.9/prebuilt/darwin-x86_64
CROSS_COMPILE=$TOOLCHAIN/bin/i686-linux-android-
ADDI_CFLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32"
SYSROOT=$NDK_HOME/platforms/$PLATFORM_VERSION/arch-$ARCH/
build

懒人脚本build_android.sh链接 创建一个新的项目 勾选C++支持

打开运行时编译器支持

解决找不到ndk的问题

选择 file ->Project Structure

设置自己的ndk-build14的包目录

拷贝jniLi 和include 到对应目录下

改写build.gradle

externalNativeBuild {
            cmake {
                cppFlags "-frtti -fexceptions"
                abiFilters 'armeabi', "x86"
            }
        }
        sourceSets {
            main {
                jniLibs.srcDirs = ['src/main/jniLibs']
            }
        }

ios平台编译左转 修改cmakelist

全部替换

cmake_minimum_required(VERSION 3.4.1)
include_directories(src/main/cpp/include)
add_library(
             native-lib
             SHARED
             src/main/cpp/native-lib.cpp )
add_library( avcodec-57 SHARED IMPORTED)
set_target_properties( avcodec-57
                       PROPERTIES IMPORTED_LOCATION
                       ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavcodec-57.so)
add_library( avdevice-57 SHARED IMPORTED)
set_target_properties( avdevice-57
                       PROPERTIES IMPORTED_LOCATION
                       ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavdevice-57.so)
add_library( avfilter-6 SHARED IMPORTED)
set_target_properties( avfilter-6
                       PROPERTIES IMPORTED_LOCATION
                       ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavfilter-6.so)
add_library( avformat-57 SHARED IMPORTED)
set_target_properties( avformat-57
                       PROPERTIES IMPORTED_LOCATION
                       ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavformat-57.so)
add_library( avutil-55 SHARED IMPORTED)
set_target_properties( avutil-55
                       PROPERTIES IMPORTED_LOCATION
                       ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavutil-55.so)
add_library( postproc-54 SHARED IMPORTED)
set_target_properties( postproc-54
                       PROPERTIES IMPORTED_LOCATION
                       ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libpostproc-54.so)
add_library( swresample-2 SHARED IMPORTED)
set_target_properties( swresample-2
                       PROPERTIES IMPORTED_LOCATION
                       ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libswresample-2.so)
add_library( swscale-4 SHARED IMPORTED)
set_target_properties( swscale-4
                        PROPERTIES IMPORTED_LOCATION
                        ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libswscale-4.so)


find_library(
              log-lib
              log )
target_link_libraries(
                       native-lib
                       ${log-lib}
                        avcodec-57
                        avdevice-57
                        avfilter-6
                        avformat-57
                        avutil-55
                        swresample-2
                        swscale-4
                        postproc-54)

java 增加库依赖

static {
        System.loadLibrary("native-lib");
        System.loadLibrary("avutil-55");
        System.loadLibrary("swresample-2");
        System.loadLibrary("avcodec-57");
        System.loadLibrary("avformat-57");
        System.loadLibrary("swscale-4");
        System.loadLibrary("postproc-54");
        System.loadLibrary("avfilter-6");
        System.loadLibrary("avdevice-57");
    }

修改native-lib.cpp

#include <jni.h>
#include <string>
extern "C"
{
    #include <libavformat/avformat.h>
}

extern "C" JNIEXPORT jstring
JNICALL
Java_playersdk_platform_leedarson_ffmpegforandroid_MainActivity_stringFromJNI(
        JNIEnv *env,
        jobject /* this */) {
    std::string hello = "Hello from C++";
    av_register_all();
    AVCodec *c_temp = av_codec_next(NULL);
    char *name = (char *) malloc(100000);
    strcpy(name, "Abality:");
    while (c_temp != NULL)
    {
        switch (c_temp->type)
        {
            case AVMEDIA_TYPE_VIDEO:
                printf("[Video]:%s\n", c_temp->name);
                strcat(name, "[Video]");
                strcat(name, c_temp->name);
                break;
            case AVMEDIA_TYPE_AUDIO:
                printf("[Audio]:%s\n", c_temp->name);
                strcat(name, "[Audio]");
                strcat(name, c_temp->name);
                break;
            default:
                printf("[Other]:%s\n", c_temp->name);
                strcat(name, "[Other]");
                strcat(name, c_temp->name);
                break;
        }
        c_temp = c_temp->next;
    }
    printf("[hahahaha]:%s\n", name);
    return env->NewStringUTF(name);
}

运行起来

到这里带ffmpeg的项目就跑起来了