Compiling libjpeg-Turbo for Android

Source: Internet
Author: User

Recently, the video is decoded to generate YUV data and then JPG images. The previous scheme is YUV-RGB-BMP-JPG, which is very slow. The calculation time is about Ms, multiple clicks on the camera may lead to video screen latency. Therefore, you can only use other methods to query libjpeg on the Internet. However, I read another article titled. The following is the use of ndk to cross-compile libjpeg-Turbo to generate a libjpeg-turbo.so.

1. download the latest libjpeg-Turbo source code from the official website, http://sourceforge.net/projects/libjpeg-turbo/, now the latest version is libjpeg-turbo-1.2.1

2. decompress the downloaded file, enter, create a JNI folder, and finally copy all the files to the JNI file.

3. Enter the JNI directory, create a configuration file (for example, jconfig. H, config. H), and enter:

 ./configure --with-jpeg8

Will generate

config.status: creating config.hconfig.status: creating jconfig.h

4. Create the Android. mk file.

# Makefile for libjpeg-turbo#####################################################                simd                        #####################################################LOCAL_PATH := $(my-dir)include $(CLEAR_VARS)LOCAL_CFLAGS += -D__ARM_HAVE_NEON# From autoconf-generated MakefileEXTRA_DIST = simd/nasm_lt.sh simd/jcclrmmx.asm simd/jcclrss2.asm simd/jdclrmmx.asm simd/jdclrss2.asm \simd/jdmrgmmx.asm simd/jdmrgss2.asm simd/jcclrss2-64.asm simd/jdclrss2-64.asm \simd/jdmrgss2-64.asm simd/CMakeLists.txt libsimd_SOURCES_DIST = simd/jsimd_arm_neon.S \                       simd/jsimd_arm.c LOCAL_SRC_FILES := $(libsimd_SOURCES_DIST)LOCAL_C_INCLUDES := $(LOCAL_PATH)/simd \                    $(LOCAL_PATH)/android AM_CFLAGS := -march=armv7-a -mfpu=neonAM_CCASFLAGS := -march=armv7-a -mfpu=neonLOCAL_ARM_MODE=arm LOCAL_MODULE_TAGS := debug LOCAL_MODULE := libsimd include $(BUILD_STATIC_LIBRARY) #########################################################           libjpeg.so                       ######################################################## include $(CLEAR_VARS)# From autoconf-generated Makefilelibjpeg_SOURCES_DIST =  jcapimin.c jcapistd.c jccoefct.c jccolor.c \        jcdctmgr.c jchuff.c jcinit.c jcmainct.c jcmarker.c jcmaster.c \        jcomapi.c jcparam.c jcphuff.c jcprepct.c jcsample.c jctrans.c \        jdapimin.c jdapistd.c jdatadst.c jdatasrc.c jdcoefct.c jdcolor.c \        jddctmgr.c jdhuff.c jdinput.c jdmainct.c jdmarker.c jdmaster.c \        jdmerge.c jdphuff.c jdpostct.c jdsample.c jdtrans.c jerror.c \        jfdctflt.c jfdctfst.c jfdctint.c jidctflt.c jidctfst.c jidctint.c \        jidctred.c jquant1.c jquant2.c jutils.c jmemmgr.c jmemnobs.c \jaricom.c jcarith.c jdarith.c \turbojpeg.c transupp.c jdatadst-tj.c jdatasrc-tj.c \turbojpeg-mapfileLOCAL_SRC_FILES:= $(libjpeg_SOURCES_DIST) LOCAL_SHARED_LIBRARIES := libcutilsLOCAL_STATIC_LIBRARIES := libsimdLOCAL_ARM_MODE=armLOCAL_C_INCLUDES := $(LOCAL_PATH)  LOCAL_CFLAGS :=-O3 -fstrict-aliasing -fprefetch-loop-arrays  -DANDROID \        -DANDROID_TILE_BASED_DECODE -DENABLE_ANDROID_NULL_CONVERT -D__ARM_HAVE_NEONAM_CFLAGS := -march=armv7-a -mfpu=neonAM_CCASFLAGS := -march=armv7-a -mfpu=neonLOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_STATIC_LIBRARY)LOCAL_MODULE_TAGS := debugLOCAL_MODULE := libjpeginclude $(BUILD_SHARED_LIBRARY)

5. Enter ndk-build on the terminal. The result is as follows:

root@zhangjie:/home/libjpeg-turbo-1.2.1/jni# ndk-buildAndroid NDK: WARNING: Unsupported source file extensions in /home/libjpeg-turbo-1.2.1/jni/Android.mk for module jpeg    Android NDK:   turbojpeg-mapfile    Compile arm    : jpeg <= jcapimin.cCompile arm    : jpeg <= jcapistd.cCompile arm    : jpeg <= jccoefct.cCompile arm    : jpeg <= jccolor.cCompile arm    : jpeg <= jcdctmgr.cCompile arm    : jpeg <= jchuff.cCompile arm    : jpeg <= jcinit.cCompile arm    : jpeg <= jcmainct.cCompile arm    : jpeg <= jcmarker.cCompile arm    : jpeg <= jcmaster.cCompile arm    : jpeg <= jcomapi.cCompile arm    : jpeg <= jcparam.cCompile arm    : jpeg <= jcphuff.cCompile arm    : jpeg <= jcprepct.cCompile arm    : jpeg <= jcsample.cCompile arm    : jpeg <= jctrans.cCompile arm    : jpeg <= jdapimin.cCompile arm    : jpeg <= jdapistd.cCompile arm    : jpeg <= jdatadst.cCompile arm    : jpeg <= jdatasrc.cCompile arm    : jpeg <= jdcoefct.cCompile arm    : jpeg <= jdcolor.cCompile arm    : jpeg <= jddctmgr.cCompile arm    : jpeg <= jdhuff.cCompile arm    : jpeg <= jdinput.cCompile arm    : jpeg <= jdmainct.cCompile arm    : jpeg <= jdmarker.cCompile arm    : jpeg <= jdmaster.cCompile arm    : jpeg <= jdmerge.cCompile arm    : jpeg <= jdphuff.cCompile arm    : jpeg <= jdpostct.cCompile arm    : jpeg <= jdsample.cCompile arm    : jpeg <= jdtrans.cCompile arm    : jpeg <= jerror.cCompile arm    : jpeg <= jfdctflt.cCompile arm    : jpeg <= jfdctfst.cCompile arm    : jpeg <= jfdctint.cCompile arm    : jpeg <= jidctflt.cCompile arm    : jpeg <= jidctfst.cCompile arm    : jpeg <= jidctint.cCompile arm    : jpeg <= jidctred.cCompile arm    : jpeg <= jquant1.cCompile arm    : jpeg <= jquant2.cCompile arm    : jpeg <= jutils.cCompile arm    : jpeg <= jmemmgr.cCompile arm    : jpeg <= jmemnobs.cCompile arm    : jpeg <= jaricom.cCompile arm    : jpeg <= jcarith.cCompile arm    : jpeg <= jdarith.cCompile arm    : jpeg <= turbojpeg.cCompile arm    : jpeg <= transupp.cCompile arm    : jpeg <= jdatadst-tj.cCompile arm    : jpeg <= jdatasrc-tj.cCompile arm    : simd <= jsimd_arm_neon.SCompile arm    : simd <= jsimd_arm.cStaticLibrary  : libsimd.aSharedLibrary  : libjpeg.soInstall        : libjpeg.so => libs/armeabi/libjpeg.so

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.