來點(diǎn)前奏說明

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本文以https://github.com/libjpeg-turbo/libjpeg-turbo
的默認(rèn)master分支進(jìn)行編譯，以Ubuntu進(jìn)行演示編譯過程。

1、硬件要求：

系統(tǒng)：  Unbuntu

2、軟件要求：

sudo apt install git
sudo apt install yasm
sudo apt install vim
sudo snap install cmake 

NDK版本要求：NDK 14及其以前的版本

下載NDK 14以前包括14的版本

3、libjpeg 編譯

git clone https://github.com/libjpeg-turbo/libjpeg-turbo.git
cd libjpeg-turbo/

Building libjpeg-turbo for Android platforms requires v13b or later of the Android NDK.

先放上我已經(jīng)寫好的shell腳本，以ARMv8 (64-bit)寫的,為命名為build_arm64_android.sh

#!/bin/bash
# Set these variables to suit your needs
NDK_PATH=/home/zhangbin/Android/Sdk/ndk-bundle
#TOOLCHAIN={"gcc" or "clang"-- "gcc" must be used with NDK r14b and earlier,and "clang" must be used with NDK r17c and later}
TOOLCHAIN=gcc
#ANDROID_VERSION={the minimum version of Android to support.  "21" or lateris required for a 64-bit build.}
ANDROID_VERSION=21
cmake -G"Unix Makefiles" \
  -DANDROID_ABI=arm64-v8a \
  -DANDROID_ARM_MODE=arm \
  -DANDROID_PLATFORM=android-${ANDROID_VERSION} \
  -DANDROID_TOOLCHAIN=${TOOLCHAIN} \
  -DCMAKE_ASM_FLAGS="--target=aarch64-linux-android${ANDROID_VERSION}" \
  -DCMAKE_TOOLCHAIN_FILE=${NDK_PATH}/build/cmake/android.toolchain.cmake \

ARMv7 (32-bit)

# Set these variables to suit your needs
NDK_PATH={full path to the NDK directory-- for example,
  /opt/android/android-ndk-r16b}
TOOLCHAIN={"gcc" or "clang"-- "gcc" must be used with NDK r16b and earlier,
  and "clang" must be used with NDK r17c and later}
ANDROID_VERSION={the minimum version of Android to support-- for example,
  "16", "19", etc.}

cd {build_directory}
cmake -G"Unix Makefiles" \
  -DANDROID_ABI=armeabi-v7a \
  -DANDROID_ARM_MODE=arm \
  -DANDROID_PLATFORM=android-${ANDROID_VERSION} \
  -DANDROID_TOOLCHAIN=${TOOLCHAIN} \
  -DCMAKE_ASM_FLAGS="--target=arm-linux-androideabi${ANDROID_VERSION}" \
  -DCMAKE_TOOLCHAIN_FILE=${NDK_PATH}/build/cmake/android.toolchain.cmake \
  [additional CMake flags] {source_directory}
make

ARMv8 (64-bit)

# Set these variables to suit your needs
NDK_PATH={full path to the NDK directory-- for example,
  /opt/android/android-ndk-r16b}
TOOLCHAIN={"gcc" or "clang"-- "gcc" must be used with NDK r14b and earlier,
  and "clang" must be used with NDK r17c and later}
ANDROID_VERSION={the minimum version of Android to support.  "21" or later
  is required for a 64-bit build.}

cd {build_directory}
cmake -G"Unix Makefiles" \
  -DANDROID_ABI=arm64-v8a \
  -DANDROID_ARM_MODE=arm \
  -DANDROID_PLATFORM=android-${ANDROID_VERSION} \
  -DANDROID_TOOLCHAIN=${TOOLCHAIN} \
  -DCMAKE_ASM_FLAGS="--target=aarch64-linux-android${ANDROID_VERSION}" \
  -DCMAKE_TOOLCHAIN_FILE=${NDK_PATH}/build/cmake/android.toolchain.cmake \
  [additional CMake flags] {source_directory}
make

執(zhí)行上面寫好的腳本，我的腳本命名為build_arm64_android.sh

./build_arm64_android.sh

Installing libjpeg-turbo

sudo make install

成功的標(biāo)志，a文件為靜態(tài)庫，so文件為動(dòng)態(tài)庫

目錄下面生成  libjpeg.a 和  libturbojpeg.a

4、libjpeg 使用