Androidstudio的FFmpeg移植

准备

1.下载最新的ndk,ffmpeg包,android studio

一.因为ffmpeg是c,c++的东西所以通过ndk编译成os文件供开发使用

1-> 解压ndk到桌面路径:     /Users/用户名/Desktop/android-ndk-r12b(后面idk路径用”&NDK_PATH&＃8221;表示)

2->将ffmpeg包解压到:     &NDK_PATH/sources/ffmpeg-3.1.1

3.->修改ffmpeg-3.1.1目录下的configure文件,目的是将生成的库类文件名字libavcodec.so.56的56版本号去掉(可用文本编辑器打开修改)

找到

修改成

4->编译FFmpeg

·在ffmpeg-3.1.1创建文件build_android.sh

·添加内容

#!/bin/bash

NDK=&NDK_PATH(NDK路径)

SYSROOT=$NDK/platforms/android-21/arch-arm/(删:指定NDK所用的编译平台)

TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64(删:指定编译工具集的位置)

function build_one

{

./configure \

&＃8211;prefix=$PREFIX \

&＃8211;enable-shared \

&＃8211;disable-static \

&＃8211;disable-doc \

&＃8211;disable-ffmpeg \

&＃8211;disable-ffplay \

&＃8211;disable-ffprobe \

&＃8211;disable-ffserver \

&＃8211;disable-avdevice \

&＃8211;disable-doc \

&＃8211;disable-symver \

&＃8211;cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \

&＃8211;target-os=linux \

&＃8211;arch=arm \

&＃8211;enable-cross-compile \

&＃8211;sysroot=$SYSROOT \

&＃8211;extra-cflags=&＃8221;-Os -fpic $ADDI_CFLAGS&＃8221;\

&＃8211;extra-ldflags=&＃8221;$ADDI_LDFLAGS&＃8221;\

$ADDITIONAL_CONFIGURE_FLAG

make clean

make

make install

}

CPU=arm

PREFIX=$(pwd)/android/$CPU

ADDI_CFLAGS=&＃8221;-marm&＃8221;

build_one

·保存后在终端执行

cd /…/…/ffmpeg3.1.3(idk中ffmpeg的文件夹路径)

sudo chmod +x build_android.sh

./build_android.sh

编译需要等待上一段时间,编译成功后会出现下面这样一个目录

其中libavcodec.so、libavfilter.so、libavformat.so、libavutil.so、libswresample.so、libswscale.so都是软链，没有用，可以删掉

·然后在arm文件夹中创建一个Android.mk文件内容如下

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE:= libavcodec

LOCAL_SRC_FILES:= lib/libavcodec-57.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE:= libavformat

LOCAL_SRC_FILES:= lib/libavformat-57.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

# FFmpeg library

include $(CLEAR_VARS)

LOCAL_MODULE:= libswscale

LOCAL_SRC_FILES:= lib/libswscale-4.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE:= libavutil

LOCAL_SRC_FILES:= lib/libavutil-54.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE:= libavfilter

LOCAL_SRC_FILES:= lib/libavfilter-6.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE:= libswresample

LOCAL_SRC_FILES:= lib/libswresample-2.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

# Program

include $(CLEAR_VARS)

LOCAL_MODULE := herobayboomerangLive

LOCAL_SRC_FILES :=com.herobay.liangchao.herobayboomerang.MainActivity.c

LOCAL_C_INCLUDES += $(LOCAL_PATH)/include        #头文件搜索路径

LOCAL_LDLIBS :=-llog -lz                         #附加的链接器选项

LOCAL_SHARED_LIBRARIES := avcodec avdevice avfilter avformat avutil postproc swresample swscale

include $(BUILD_SHARED_LIBRARY)

要注意其中.so前面的数字应该改成你的ffmpeg版本编译出来的数字

到这里就完成了ffmpeg库文件的编译可以再android项目中使用了

二.在android studio中进行使用

1.将下面的内容添加到项目中的jni文件夹中

2.在local.properties文件配置ndk路径

ndk.dir=&NDK_PATH 如:

3.配置app的build.gradle文件

·添加这一段禁止自动ndk-build

sourceSets.main.jni.srcDirs = []

·添加这一段让它知道调用哪个库

ndk {

abiFilter &＃8220;armeabi&＃8221;

moduleName &＃8220;ovsplayer&＃8221;

ldLibs &＃8220;log&＃8221;, &＃8220;z&＃8221;, &＃8220;m&＃8221;, &＃8220;jnigraphics&＃8221;, &＃8220;android&＃8221;

}

如:

4.在grade.properties文件中添加:android.useDeprecatedNdk=true

5.进入Project中的src/main/jni文件夹,修改其中的Application.mk文件,添加:APP_PLATFORM := android-21(因为该example采用-ljnigraphics默认库,这个库在android-3中没有,如果不声明的话,idk会默认采用android-3进行build)

接下来就可以开始FFmpeg的使用了