要在Android下从事音视频开发,同样也绕不开ffmpeg+opencv,不管是初学者还是有一定经验的程序,面临的首要问题就是环境的搭建和库文件的编译配置等问题,特别是初学者,往往会在实际开发前浪费大量的时间来编译ffmpeg及opencv的动态库.so文件。因此作者整理了自己实际开发用的ffmpeg及opencv库文件(ffmpeg已集成x264+aac+mp3编码),并集成到Eclipse开发环境中(JNI方式)实际运行成功后作为一个模板提供给大家,方便初学者快速上手进行实际开发,节省您大量宝贵时间。当然,Android SDK和NDK需要自己下载,然后在Eclipse中指定相应路径就可以了。
1.下载模板文件到本地磁盘并解压,解压后的路径如E:\jPro\demo\AndroidManifest.xml。
2.启动eclipse并导入该项目。
3.导入后如图所示:
4.用usb连接线把你的手机与电脑连接起来并允许在手机上调试项目。
5.右单击项目并选择调试为Android程序。
6.选中手机单击ok按钮会在手机上安装应用,安装成功后显示如下界面则表示成功。
然后你就可以在此基础上自由的开发了!
现在,让我们回过头来看下与jni有关的重要选项。
7./demo/jni/Android.mk:位于项目 jni
子目录中,用于向构建系统描述源文件和共享库,可以在其中配置动态链接库.so,类似于vs2013中加载.dll,在该项目中,其内容如下:
LOCAL_PATH := $(call my-dir)
#ffmpeg lib
include $(CLEAR_VARS)
LOCAL_MODULE := avcodec
LOCAL_SRC_FILES := lib/libavcodec.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := avdevice
LOCAL_SRC_FILES := lib/libavdevice.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := avfilter
LOCAL_SRC_FILES := lib/libavfilter.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := avformat
LOCAL_SRC_FILES := lib/libavformat.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := avutil
LOCAL_SRC_FILES := lib/libavutil.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := postproc
LOCAL_SRC_FILES := lib/libpostproc.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := swresample
LOCAL_SRC_FILES := lib/libswresample.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := swscale
LOCAL_SRC_FILES := lib/libswscale.so
include $(PREBUILT_SHARED_LIBRARY)
#x264 lib
include $(CLEAR_VARS)
LOCAL_MODULE := libx264
LOCAL_SRC_FILES := lib/libx264.161.so
include $(PREBUILT_SHARED_LIBRARY)
#opencv lib
include $(CLEAR_VARS)
LOCAL_MODULE := opencv
LOCAL_SRC_FILES :=lib/libopencv_java3.so
include $(PREBUILT_SHARED_LIBRARY)
#demo
include $(CLEAR_VARS)
LOCAL_MODULE := demo
LOCAL_SRC_FILES := demo.cpp
LOCAL_C_INCLUDES += $(LOCAL_PATH)/include
##-landroid for native windows
LOCAL_LDLIBS := -llog -landroid
#LOCAL_LDLIBS := -llog -lz
LOCAL_SHARED_LIBRARIES :=opencv libx264 avcodec avdevice avfilter avformat avutil postproc swresample swscale
include $(BUILD_SHARED_LIBRARY)
8./demo/jni/Application.mk:位于应用项目目录中的 jni
下,用于指定 ndk-build 的项目级设置。
APP_ABI := armeabi-v7a
APP_STL:=gnustl_static
APP_CPPFLAGS:=-frtti -fexceptions