libyuv—AndroidStudio 编译libyuv

libyuv是google 开源的用于实现对各种yuv数据之间的转换包括裁剪、缩放、旋转，以及yuv和rgb 之间的转换，底层有一部分代码是基于汇编实现的，大大提高了转换速度。在Android 平台下一般用于处理直接从摄像头获取的原始yuv数据。 Android studio 最新版的已经支持了ndk 编译了，支持原先的Android.mk方式编译个Cmake编译方式，这里才用原始的编译方式。我用的版本是2.3.2，ndk版本是r13b。

1.下载NDK r3b

https://dl.google.com/android/repository/android-ndk-r13b-linux-x86_64.zip

2.在Project Structure 设置ndk 路径

 

Android.mk 文件内容

 

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_C_INCLUDES := \
    ./jni/include

LOCAL_MODULE 	:= libyuv
LOCAL_LDLIBS 	:= -ljnigraphics -llog



LOCAL_SRC_FILES := \
source/compare_common.cc \
source/compare_gcc.cc \
source/compare_neon64.cc \
source/compare_win.cc \
source/compare.cc \
source/convert_argb.cc \
source/convert_from_argb.cc \
source/convert_from.cc \
source/convert_jpeg.cc \
source/convert_to_argb.cc \
source/convert_to_i420.cc \
source/convert.cc \
source/cpu_id.cc \
source/mjpeg_decoder.cc \
source/mjpeg_validate.cc \
source/planar_functions.cc \
source/rotate_any.cc \
source/rotate_argb.cc \
source/rotate_common.cc \
source/rotate_gcc.cc \
source/rotate_mips.cc \
source/rotate_neon64.cc \
source/rotate_win.cc \
source/rotate.cc \
source/row_any.cc \
source/row_common.cc \
source/row_gcc.cc \
source/row_mips.cc \
source/row_neon64.cc \
source/row_win.cc \
source/scale_any.cc \
source/scale_argb.cc \
source/scale_common.cc \
source/scale_gcc.cc \
source/scale_mips.cc \
source/scale_neon64.cc \
source/scale_win.cc \
source/scale.cc \
source/video_common.cc

ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
    LOCAL_CFLAGS += -DLIBYUV_NEON
    LOCAL_SRC_FILES += \
        source/compare_neon.cc.neon    \
        source/rotate_neon.cc.neon     \
        source/row_neon.cc.neon        \
        source/scale_neon.cc.neon
endif

include $(BUILD_SHARED_LIBRARY)

Application.mk 内容

 

 

 

 

APP_PLATFORM := android-14
APP_ABI := armeabi-v7a

gradle 配置

 

 

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"
    defaultConfig {
        applicationId "com.example.libyuv"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    externalNativeBuild {
        ndkBuild {
            path "jni/Android.mk"
        }
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }



    defaultConfig {
        externalNativeBuild {
            ndkBuild {
                arguments "NDK_APPLICATION_MK:=jni/Application.mk", "APP_PLATFORM:=android-14"
                abiFilters "armeabi-v7a"
            }
        }
    }

}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
}

 

下载地址

 

https://github.com/XIAIBIANCHENG/android-libyuv