OSX下NDK编译ffmpg和libx264
近期在研究Android视频开发相关的内容，先从ffmpg开发入手。这里描述下如何在mac osx 下使用NDK来编译libx264和ffmpg的过程。
1.版本
ndk：23版本，23版本ndk变化是去掉了platforms文件夹
下载地址： google官方 https://developer.android.com/ndkffmpeg: 4.4
从github获取 git@github.com:FFmpeg/FFmpeg.git git checkout release/4.4libx264: 用于支持ffmpeg编码h264。
git clone https://code.videolan.org/videolan/x264.git git checkout stable
2. NDK 编译libx264
首先需要修改configure脚本，由于原有交叉编译选项在ndk 23下有缺陷，需要手工修复
原来的代码：去configure下找 首先由于NDK 23版本是llvm clange的编译器，于是修改
CC="${CC-${cross_prefix}gcc}"
## 修改为：
CC="${CC-${cross_prefix}clang}"
STRIP="${STRIP-${cross_prefix}strip}"
## 增加cross_prefix_tool变量，并修改为llvm：
STRIP="${STRIP-${cross_prefix-tool}llvm-strip}"
STRINGS="${STRINGS-${cross_prefix}strings}"
## 增加cross_prefix_tool变量，并修改为llvm：
STRINGS="${STRINGS-${cross_prefix_tool}llvm-strings}"
INSTALL="${INSTALL-install}"
PKGCONFIG="${PKGCONFIG-${cross_prefix}pkg-config}
## 增加cross_prefix_tool变量，并修改为llvm：
PKGCONFIG="${PKGCONFIG-${cross_prefix-tool}llvm-pkg-config}
# ar and ranlib doesn't load the LTO plugin by default, prefer the gcc-prefixed wrappers which does.
if ${cross_prefix}gcc-ar --version >/dev/null 2>&1; then
AR="${AR-${cross_prefix}gcc-ar}"
else
AR="${AR-${cross_prefix}ar}"
# 支持llvm
AR="${AR-${cross_prefix-tool}llvm-ar}"
fi
if ${cross_prefix}gcc-ranlib --version >/dev/null 2>&1; then
RANLIB="${RANLIB-${cross_prefix}gcc-ranlib}"
else
RANLIB="${RANLIB-${cross_prefix}lranlib}"
# 支持llvm
AR="${AR-${cross_prefix-tool}llvm-ranlib}"
fi
引入新的选项
cross_prefix_tool=""
--cross-prefix-tool=*)
cross_prefix_tool="$optarg"
;;
编写如下build脚本：
#!/bin/bash
export NDK_HOME=/Volumes/data/Android/NDK
function build() {
./configure --prefix=$PREFIX \
--cross-prefix=$CROSS_COMPILE \
--sysroot=$SYSROOT \
--enable-static \
--enable-shared \
--enable-pic \
--disable-asm \
--cross-prefix-tool=/Volumes/data/Android/NDK/toolchains/llvm/prebuilt/darwin-x86_64/bin/ \
--host=$host
make clean
make -j8
make install
}
#x86
ARCH=x86_64
CPU=x86_64
PREFIX=$(pwd)/android/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin
CROSS_COMPILE=/Volumes/data/Android/NDK/toolchains/llvm/prebuilt/darwin-x86_64/bin/x86_64-linux-android31-
host="x86_64-linux"
build
#AARCH
ARCH=armv7a
CPU=armv7a
PREFIX=$(pwd)/android/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin
CROSS_COMPILE=/Volumes/data/Android/NDK/toolchains/llvm/prebuilt/darwin-x86_64/bin/armv7a-linux-androideabi31-
host="arm-linux"
build
#AARCH
ARCH=arm64
CPU=arm64
PREFIX=$(pwd)/android/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin
CROSS_COMPILE=/Volumes/data/Android/NDK/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android31-
host="arm64-linux"
build
运行该脚本完成libx264的编译
3. 编译ffmpeg
编写如下脚本：
#!/bin/bash
export NDK_HOME=/Volumes/data/Android/NDK
export PLATFORM_VERSION=android-10
export X264_LOCATION=/Users/lokie/Downloads/x264/android
function build
{
echo "start build ffmpeg for $ARCH"
make clean
./configure --target-os=android \
--prefix=$PREFIX --arch=$ARCH \
--disable-doc \
--enable-shared \
--disable-static \
--disable-yasm \
--disable-asm \
--disable-symver \
--enable-gpl \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--cross-prefix=$CROSS_COMPILE \
--enable-cross-compile \
--sysroot=$SYSROOT \
--enable-small \
--nm=$NM \
--strip=$STRIP \
--enable-libx264 \
--extra-cflags="-I$InclueX264" \
--extra-ldflags="-L$LinkX264" \
make -j8
make install
echo "build ffmpeg for $ARCH finished"
}
#x86
ARCH=x86_64
CPU=x86_64
PREFIX=$(pwd)/android/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin
CROSS_COMPILE=$TOOLCHAIN/x86_64-linux-android31-
STRIP=$TOOLCHAIN/llvm-strip
NM=$TOOLCHAIN/llvm-nm
ADDI_CFLAGS="-marm"
InclueX264=$X264_LOCATION/$ARCH/include
LinkX264=$X264_LOCATION/$ARCH/lib
SYSROOT=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/sysroot
build
#arm64
ARCH=arm64
CPU=arm64
PREFIX=$(pwd)/android/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin
CROSS_COMPILE=/Volumes/data/Android/NDK/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android31-
ADDI_CFLAGS="-marm"
SYSROOT=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/sysroot
STRIP=$TOOLCHAIN/llvm-strip
NM=$TOOLCHAIN/llvm-nm
InclueX264=$X264_LOCATION/$ARCH/include
LinkX264=$X264_LOCATION/$ARCH/lib
build
#arm
ARCH=armv7a
CPU=armv7a
PREFIX=$(pwd)/android/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin
CROSS_COMPILE=/Volumes/data/Android/NDK/toolchains/llvm/prebuilt/darwin-x86_64/bin/armv7a-linux-androideabi31-
ADDI_CFLAGS="-marm"
SYSROOT=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/sysroot
STRIP=$TOOLCHAIN/llvm-strip
NM=$TOOLCHAIN/llvm-nm
InclueX264=$X264_LOCATION/$ARCH/include
LinkX264=$X264_LOCATION/$ARCH/lib
build
执行就可以完成编译
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