编译vlc源
官方文档:https://wiki.videolan.org/AndroidCompile/
我们按照官方文档首先需要下载相应的软件:
sudo apt-get install automake ant autopoint cmake build-essential libtool-bin patch pkg-config protobuf-compiler ragel subversion unzip git openjdk-8-jre openjdk-8-jdk flex python wget
请不要直接复制官网的软件下载，会出现无法下载的问题，因为\和空格无法删除
然后我们需要jdk1.8，首先我们可以先看下Java的版本：java -version
openjdk version "11.0.6" 2020-01-14
OpenJDK Runtime Environment (build 11.0.6+10-post-Ubuntu-1ubuntu118.04.1)
OpenJDK 64-Bit Server VM (build 11.0.6+10-post-Ubuntu-1ubuntu118.04.1, mixed mode)
有一些有自带的jdk，如上，这时候就需要重新下载1.8，为什么？
如果不下载1.8并且配置的话会报下面的这个错误
compile:
[javac] /root/myworkdir/vlc-android/vlc/contrib/contrib-android-aarch64-linux-android/bluray/src/libbluray/bdj/build.xml:26: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
[javac] Compiling 33 source files to /root/myworkdir/vlc-android/vlc/contrib/contrib-android-aarch64-linux-android/bluray/src/libbluray/bdj/build
[javac] warning: [options] bootstrap class path not set in conjunction with -source 5
[javac] error: Source option 5 is no longer supported. Use 6 or later.
[javac] error: Target option 1.5 is no longer supported. Use 1.6 or later.
BUILD FAILED
/root/myworkdir/vlc-android/vlc/contrib/contrib-android-aarch64-linux-android/bluray/src/libbluray/bdj/build.xml:26: Compile failed; see the compiler error output for details.
Total time: 1 second
Makefile:2618: recipe for target 'all-local' failed
make[1]: *** [all-local] Error 1
make[1]: Leaving directory '/root/myworkdir/vlc-android/vlc/contrib/contrib-android-aarch64-linux-android/bluray'
../../contrib/src/bluray/rules.mak:56: recipe for target '.bluray' failed
make: *** [.bluray] Error 2
这个错误就是需要一个1.8的jdk，这时候我们把Linux版本的jdk1.8下载好之后(这里不贴链接)，需要配置Java环境
sudo vim /etc/profile
在最后一行加上
export JAVA_HOME=/root/myworkdir/jdk1.8.0_11//这里写上自己的jdk路径
export JAVA_BIN=$JAVA_HOME/bin
export JAVA_LIB=$JAVA_HOME/lib
export CLASSPATH=.:$JAVA_LIB/tools.jar:$JAVA_LIB/dt.jar
export PATH=$JAVA_BIN:$PATH
开始编译
./buildsystem/compile.sh -a arm64-v8(这个地方填写的是cpu版本)
如果你不知道cpu版本怎么写，可以
./buildsystem/compile.sh --help
进行查看
Use -a to set the ARCH:
ARM: (armeabi-v7a|arm)
ARM64: (arm64-v8a|arm64)
X86: x86, x86_64
Use --release to build in release mode
Use --signrelease to build in release mode and sign apk, see vlc-android/build.gradle
Use -s to set your keystore file and -p for the password
Use -c to get a ChromeOS build
Use -l to build only LibVLC
Use -b to bypass libvlc source checks (vlc custom sources)
现在就正式开始编译
这时候我们会遇到第一个问题
You must define ANDROID_NDK, ANDROID_SDK before starting.
They must point to your NDK and SDK directories.
所以我们需要配置Android sdk和ndk的环境变量
export ADNROID_SDK=/path
export ANDROID_NDK=/path
export PATH=$PATH:$ANDROID_SDK/platform-tools:$ANDROID_SDK/tools
直接执行命令可以配置一个临时的环境变量
但是可能会造成失败的情况所以我们需要更改我们的~/.bashrc文件来为当前用户配置环境变量
sudo vim ~/.bashrc
也可以修改/etc/profile文件让我们的系统新增环境变量
sudo vim /etc/profile
这个 时候我们就把当前的环境变量配置完成，现在可以执行编译
buildsystem/compile.sh -a <ABI>
请注意，我们新手学习Linux编译的时候会直接复制造成不必要的错误，一定要注意，在vlc-Android里的这个compile.sh是一个可执行文件，所以之前的那其实是一个路径，第二是参数，第三是参数的值请一定注意，上一篇文章已经说过-a参数的值怎么去写这里不多赘述，然后执行编译
我们运行脚本之后会发现一个问题，那就是会出现
Download Gradle
我们知道这是在下载Android的gradle，但是就是这个访问速度着实让人难受所以我们需要去修改compile.sh脚本
sudo vim compile.sh
我们可以看到这一段
if [ ! -d "gradle/wrapper" ]; then
diagnostic "Downloading gradle"
GRADLE_VERSION=5.6.4
GRADLE_URL=https://download.videolan.org/pub/contrib/gradle/gradle-${GRADLE_VERSION}-bin.zip
wget ${GRADLE_URL} 2>/dev/null || curl -O ${GRADLE_URL} || fail "gradle: download failed"
unzip -o gradle-${GRADLE_VERSION}-bin.zip || fail "gradle: unzip failed"
./gradle-${GRADLE_VERSION}/bin/gradle wrapper || fail "gradle: wrapper failed"
./gradlew -version || fail "gradle: wrapper failed"
chmod a+x gradlew
rm -rf gradle-${GRADLE_VERSION}-bin.zip
fi
很明显这里是说如果没找到gradle/wrapper这个目录，那就下载gradle
所以我们可以修改这段脚本，删掉下载的代码，把我们下载好的gradle解压，请注意这个脚本用的是5.6.4可以修改成你自己下载好的，我用的就是5.6.4，gradle:https://services.gradle.org/distributions/
if [ ! -d "gradle/wrapper" ]; then
# diagnostic "Downloading gradle"
GRADLE_VERSION=5.6.4
# GRADLE_URL=https://download.videolan.org/pub/contrib/gradle/gradle-${GRADLE_VERSION}-bin.zip
# wget ${GRADLE_URL} 2>/dev/null || curl -O ${GRADLE_URL} || fail "gradle: download failed"
unzip -o gradle-${GRADLE_VERSION}-bin.zip || fail "gradle: unzip failed"
./gradle-${GRADLE_VERSION}/bin/gradle wrapper || fail "gradle: wrapper failed"
./gradlew -version || fail "gradle: wrapper failed"
chmod a+x gradlew
rm -rf gradle-${GRADLE_VERSION}-bin.zip
fi
然后我们又会遇到一个问题，那就是又需要下载vlc，同样也是访问速度的问题，我们需要修改这个脚本的这一段
TESTED_HASH=7f204ee
VLC_REPOSITORY=https://git.videolan.org/git/vlc/vlc-3.0.git
if [ ! -d "vlc" ]; then
diagnostic "VLC sources: not found, cloning"
git clone "${VLC_REPOSITORY}" vlc || fail "VLC sources: git clone failed"
cd vlc
diagnostic "VLC sources: resetting to the TESTED_HASH commit (${TESTED_HASH})"
git reset --hard ${TESTED_HASH} || fail "VLC sources: TESTED_HASH ${TESTED_HASH} not found"
diagnostic "VLC sources: applying custom patches"
# Keep Message-Id inside commits description to track them afterwards
git am --message-id ../libvlc/patches/vlc3/*.patch || fail "VLC sources: cannot apply custom patches"
cd ..
else
diagnostic "VLC source: found sources, leaving untouched"
fi
if [ "$BYPASS_VLC_SRC_CHECKS" = 1 ]; then
diagnostic "VLC sources: Bypassing checks (required by option)"
else
diagnostic "VLC sources: Checking TESTED_HASH and patches presence"
diagnostic "NOTE: checks can be bypass by adding '-b' option to this script."
cd vlc
git cat-file -e ${TESTED_HASH} 2> /dev/null || \
fail "Error: Your vlc checkout does not contain the latest tested commit: ${TESTED_HASH}"
for patch_file in ../libvlc/patches/vlc3/*.patch; do
check_patch_is_applied "$patch_file"
done
cd ..
fi
删掉下载的代码，把自己下载好的vlc解压到vlc-Android里，请注意这里的目录名称必须为vlc
然后我们可以继续开始编译vlc
后面我们还会遇到一个问题，那就是gradle的问题，我当时报的错是什么什么byte exist，然后再次执行编译的时候又会说什么compile fail 然后我找了一些资料还是没找到，但是看到一个说是修改为Android studio的jdk，所以我感觉是高版本的gradle或者说是vlc会出现的问题，所以我把jdk的路径改成了Android studio的这时候就通过了，对于下载速度慢的问题我是采取的用服务器的方式，我建议还是用服务器，因为有可能配置方面可能考虑不周全，如果一个一个去处理很麻烦，一定要注意是有外网的服务器
./libvlc/build/outputs/aar/libvlc-armv7-3.3.0-eap03.aar，这里是结果
链接：https://pan.baidu.com/s/1NvFDPvCTm9WPDym3UT1vxA
提取码：rm7c
