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作者:EasyWave 时间:2014.10.31
类别:Linux应用-MP4视频录制库MP4V2移植心得和简介 声明:转载,请保留链接
注意:如有错误,欢迎指正。这些是我学习的日志文章......
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一:MP4V2库简介
MP4V2的前身是MPEG4IP开源项目中的一个功能库,但是现在MPEG4IP已经不在更新了。但是MP4V2还在更新,并且独立出来了。MP4V2主要是作为MP4文件的录制一个开源库,如下所示:
MPEG4IP提供一个端对端的系统来实现音视频流的传输,支持包括MPEG4/H.261/MPEG2/H.263 MP3/AAC/AMR等不同编码格式。现在关于Google相关的code.google.com已经无法打开了,因此只好提供下面的下载地址,如下所示:https://launchpad.net/ubuntu/+source/mp4v2
二:MP4V2的编译
在Linux下编译MP4V2,首先需要配置哪些选项,我们可以通过configure来看看,执行./configure --help就可以了,如下所示:
/work/PRJ/mp4v2/mp4v2-2.0.0$ ./configure --help `configure' configures MP4v2 2.0.0 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] --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/mp4v2] --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] --disable-debug disable debugging compilation --disable-optimize disable optimizing compilation --disable-fvisibility disable use of -fvisibility --disable-gch disable GCC precompiled-headers --disable-largefile disable LFS (large file support) --disable-util disable build of command-line utilities --enable-bi=ARCH enable -mARCH for bi-arch compilation --enable-ub[=ARCHS] enable -arch ARCH for universal-binaries (OSX only) --enable-cygwin-win32 when building with Cygwin use -mwin32 --enable-mingw-threads when building with MinGW use -mthreads --disable-dependency-tracking speeds up one-time build --enable-dependency-tracking do not reject slow dependency extractors --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) Optional Packages: --with-PACKAGE[=ARG] use PACKAGE [ARG=yes] --without-PACKAGE do not use PACKAGE (same as --with-PACKAGE=no) --with-pic try to use only PIC/non-PIC objects [default=use both] --with-gnu-ld assume the C compiler uses GNU ld [default=no] Some influential environment variables: CXX C++ compiler command CXXFLAGS C++ compiler flags LDFLAGS linker flags, e.g. -L<lib dir> if you have libraries in a nonstandard directory <lib dir> LIBS libraries to pass to the linker, e.g. -l<library> CPPFLAGS (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if you have headers in a nonstandard directory <include dir> CC C compiler command CFLAGS C compiler flags 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 <[email protected]>.有太多的选项,应该怎么选呢,我这里提供了一个build.sh脚本,请按着里面的配置来做就好了,不过需要注意的是:--disable-optimize,如果使能--enable-optimize之后,mp4v2编译出来的库会少很多,否则mp4v2库就会比较大一些,具体的取舍就看自己去觉得啦,这里就不扯这个啦。build.sh脚本文件如下所示:
只要运行./build.sh脚本之后会自动去编译和安装,编译成功之后,会在_install目录中生成如下的文件夹,如下所示:
看看lib目录下是否有mp4v2的库,如下所示:
想要知道如何使用这个库,可以参考util目录下的应用代码,如下所示:
具体的应用就需要自己的去看啦,后续会将其用到一个实际的项目当中去。这里就不详细介绍如何使用啦。