环境 ubuntu21.04 + Android NDK r21e(下载 Android NDK 可以参考编译x264)
gitee链接(编译出的 android faac 静态库和动态库以及头文件)
1.下载faac
wget https://nchc.dl.sourceforge.net/project/faac/faac-src/faac-1.29/faac-1.29.9.2.tar.gz tar -xvf faac-1.29.9.2.tar.gz
2.编写编译脚本
cd faac-1.29.9.2/ touch build_faac.sh gedit build_faac.sh
脚本内容如下
#!/bin/bash PREFIX=/home/hg/faac-1.29.9.2/android export NDK=/home/hg/android-ndk-r21e TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/linux-x86_64 export CC=$TOOLCHAIN/bin/armv7a-linux-androideabi21-clang export CFLAGS="-O0 -g -fPIC" ./configure --prefix=$PREFIX --host=arm-linux-androideabi --with-pic make clean make install
3.运行脚本
sudo chmod +x build_faac.sh bash build_faac.sh
生成了android/armv7a目录以及相应的文件
下面说明下是怎么写出来的这个脚本
在终端输入 bash configure --help 输出内容如下
hg@ubuntu:~/faac-1.29.9.2$ bash configure -help
`configure' configures faac 1.29.9.2 to adapt to many kinds of systems.
Usage: configure [OPTION]... [VAR=VALUE]...
To assign environment variables (e.g., CC, CFLAGS...), specify them as
VAR=VALUE. See below for descriptions of some of the useful variables.
Defaults for the options are specified in brackets.
Configuration:
-h, --help display this help and exit
--help=short display options specific to this package
--help=recursive display the short help of all the included packages
-V, --version display version information and exit
-q, --quiet, --silent do not print `checking ...' messages
--cache-file=FILE cache test results in FILE [disabled]
-C, --config-cache alias for `--cache-file=config.cache'
-n, --no-create do not create output files
--srcdir=DIR find the sources in DIR [configure dir or `..']
Installation directories:
--prefix=PREFIX install architecture-independent files in PREFIX
[/usr/local]
--exec-prefix=EPREFIX install architecture-dependent files in EPREFIX
[PREFIX]
By default, `make install' will install all the files in
`/usr/local/bin', `/usr/local/lib' etc. You can specify
an installation prefix other than `/usr/local' using `--prefix',
for instance `--prefix=$HOME'.
For better control, use the options below.
Fine tuning of the installation directories:
--bindir=DIR user executables [EPREFIX/bin]
--sbindir=DIR system admin executables [EPREFIX/sbin]
--libexecdir=DIR program executables [EPREFIX/libexec]
--sysconfdir=DIR read-only single-machine data [PREFIX/etc]
--sharedstatedir=DIR modifiable architecture-independent data [PREFIX/com]
--localstatedir=DIR modifiable single-machine data [PREFIX/var]
--runstatedir=DIR modifiable per-process data [LOCALSTATEDIR/run]
--libdir=DIR object code libraries [EPREFIX/lib]
--includedir=DIR C header files [PREFIX/include]
--oldincludedir=DIR C header files for non-gcc [/usr/include]
--datarootdir=DIR read-only arch.-independent data root [PREFIX/share]
--datadir=DIR read-only architecture-independent data [DATAROOTDIR]
--infodir=DIR info documentation [DATAROOTDIR/info]
--localedir=DIR locale-dependent data [DATAROOTDIR/locale]
--mandir=DIR man documentation [DATAROOTDIR/man]
--docdir=DIR documentation root [DATAROOTDIR/doc/faac]
--htmldir=DIR html documentation [DOCDIR]
--dvidir=DIR dvi documentation [DOCDIR]
--pdfdir=DIR pdf documentation [DOCDIR]
--psdir=DIR ps documentation [DOCDIR]
Program names:
--program-prefix=PREFIX prepend PREFIX to installed program names
--program-suffix=SUFFIX append SUFFIX to installed program names
--program-transform-name=PROGRAM run sed PROGRAM on installed program names
System types:
--build=BUILD configure for building on BUILD [guessed]
--host=HOST cross-compile to build programs to run on HOST [BUILD]
Optional Features:
--disable-option-checking ignore unrecognized --enable/--with options
--disable-FEATURE do not include FEATURE (same as --enable-FEATURE=no)
--enable-FEATURE[=ARG] include FEATURE [ARG=yes]
--enable-silent-rules less verbose build output (undo: "make V=1")
--disable-silent-rules verbose build output (undo: "make V=0")
--enable-drm Digital Radio Mondiale support
--enable-dependency-tracking
do not reject slow dependency extractors
--disable-dependency-tracking
speeds up one-time build
--enable-shared[=PKGS] build shared libraries [default=yes]
--enable-static[=PKGS] build static libraries [default=yes]
--enable-fast-install[=PKGS]
optimize for fast installation [default=yes]
--disable-libtool-lock avoid locking (might break parallel builds)
--disable-largefile omit support for large files
Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
--without-PACKAGE do not use PACKAGE (same as --with-PACKAGE=no)
--with-pic[=PKGS] try to use only PIC/non-PIC objects [default=use
both]
--with-aix-soname=aix|svr4|both
shared library versioning (aka "SONAME") variant to
provide on AIX, [default=aix].
--with-gnu-ld assume the C compiler uses GNU ld [default=no]
--with-sysroot[=DIR] Search for dependent libraries within DIR (or the
compiler's sysroot if not specified).
Some influential environment variables:
CC C compiler command
CFLAGS C compiler flags
LDFLAGS linker flags, e.g. -L if you have libraries in a
nonstandard directory
LIBS libraries to pass to the linker, e.g. -l
CPPFLAGS (Objective) C/C++ preprocessor flags, e.g. -I if
you have headers in a nonstandard directory
CXX C++ compiler command
CXXFLAGS C++ compiler flags
LT_SYS_LIBRARY_PATH
User-defined run-time library search path.
CPP C preprocessor
CXXCPP C++ preprocessor
Use these variables to override the choices made by `configure' or to help
it to find libraries and programs with nonstandard names/locations.
Report bugs to
将以上选项设置即可
其中-with-pic猜测这个选项是为了生成与位置无关的指令，也就是生成相对地址指令，这是 so 库需要的，但是我已经在 CFLAGS中指定了 -fpic 不知道二者是否都是一样的功能。
因为我们是为了生成 armv7a 平台下的 so 库，所以我们需要使用 armv7a-linux-androideabi21-clang ， 这里我并不清楚到底使用哪个版本的clang，因为我使用的ndk版本是 android-ndk-r21e ,而且我自己的Android 项目的最低兼容是21，所以我使用了 armv7a-linux-androideabi21-clang ，也就是在编译脚本中写的
export CC=$TOOLCHAIN/bin/armv7a-linux-androideabi21-clang
因为 faac 是用 C 语言写的，所以我认为不需要配置C++编译器的相关参数
