上一篇文章說到,怎麼將ffmepg打包成so庫的編譯過程,這篇文章將把上一篇文章的so庫打包進android studio中,通常情況下只需要直接將so庫和頭文件直接放在libs下就可以,但是那樣比較容易錯,本人試過好幾次都有頭文件找不到的報錯,於是直接採用下面的方法:
1將ndk路徑添加到環境變量
touch ~/.bash_profile
open ~/.bash_profile
然後在文本內輸入ndk的路徑,本文是
export PATH=$PATH:/Users/wenxi/Library/Android/sdk/ndk-bundle (也就是SDK默認的下載路徑)
然後source ~/.bash_profile使環境變量生效。
2,將編譯生成的頭文件和libs放入ndk的sources目錄,這個目錄會在ndk編譯的時候被引用,本文采用的路徑是
sources/ffmepg/android/arm(這個路徑在studio的工程中將會被用到,要記下來)
頭文件和lib目錄放在arm文件夾裏面,在arm文件夾裏面新建一個Android.mk文件,
其內容如下:
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:= libavdevice
LOCAL_SRC_FILES:= lib/libavdevice-57.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:= libavformat
LOCAL_SRC_FILES:= lib/libavformat-57.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE:= libavutil
LOCAL_SRC_FILES:= lib/libavutil-55.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE:= libpostproc
LOCAL_SRC_FILES:= lib/libpostproc-54.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)
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:= libx264
LOCAL_SRC_FILES:= lib/libx2641.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)
大概的意思是將lib下的so重新命名並綁定頭文件,這樣我們就不用那麼麻煩把頭文件添加到工程了
3在android studio中創建jni
在工程的main目錄下創建jni文件夾,在該文件夾下創建Android.mk文件,內容如下:
LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := tutorial01 LOCAL_SRC_FILES := tutorial01.c LOCAL_LDLIBS := -llog -ljnigraphics -lz LOCAL_SHARED_LIBRARIES := libavcodec libavdevice libavfilter libavformat libavutil libpostproc libswresample libswscale libx264 include $(BUILD_SHARED_LIBRARY) $(call import-module,ffmepg/android/arm)
其中,ffmepg/android/arm就是我們剛纔記錄下來的路徑
創建一個Application.mk文件:
APP_ABI := armeabi #APP_ABI := armeabi-v7a APP_PLATFORM := android-24
最後,在android studio下打開終端,sudo一下,cd 到工程的main文件夾,然後執行ndk-build命令看到編譯結果
在libs文件夾下看到對應的so就成功了
下面我們來寫個hello word牛刀小試下,新建一個工程,裏面有一個textview ,
在main activity裏面加載所有的so文件庫,
static { System.loadLibrary("x2641"); System.loadLibrary("avcodec-57"); System.loadLibrary("avdevice-57"); System.loadLibrary("avfilter-6"); System.loadLibrary("avformat-57"); System.loadLibrary("avutil-55"); System.loadLibrary("postproc-54"); System.loadLibrary("swresample-2"); System.loadLibrary("swscale-4"); System.loadLibrary("hello"); }
創建一個Utilts類,下面定義一個方法
public native String stringFromJNI();
使用java生成.h文件(參考ndk教程的使用,本文不再描述)
創建一個.c文件,
其內容如下,
#include <jni.h> #include <com_example_wenxi_myapplication_Utils.h> #include "libavcodec/avcodec.h" JNIEXPORT jstring JNICALL Java_com_example_wenxi_myapplication_Utils_stringFromJNI (JNIEnv *env, jobject obj) { char info[10000] = { 0 }; sprintf(info, "%s\n", avcodec_configuration()); return (*env)->NewStringUTF(env, info); }該函數用來返回ffmepg的配置信息
我們讓它顯示在textview上
Utils utils=new Utils(); editText=(TextView)findViewById(R.id.textview); editText.setText(utils.stringFromJNI());
我們需要設置一下NDK的相關配置:
在gradle.properties中添加
android.useDeprecatedNdk=true //該代碼啓動NDK的相關配置
然後在APP build中添加
sourceSets.main {
jni.srcDirs = []
jniLibs.srcDir 'src/main/libs'
}
該代碼用來配置NDK相關資源的目錄,沒有這個APP會崩潰
最後,運行如圖:
最後,貢獻自己的源碼:http://download.csdn.net/detail/qq_25817651/9655958