android编译mp4v2

最近项目需要使用到mp4v2，记录一下基于ndkexternalBuild的流程

1. 下载源码

这个项目比较老，貌似也没有人维护了，在git发现上面fork了不少版本，选择star最多的
TechSmith/mp4v2

2.删掉几个平台相关的文件

在编译时发现几个文件都是win平台相关，删掉才能用
libplatform/io/FileSystem_win32.cpp
libplatform/io/File_win32.cpp

3.修改获取时间函数

milliseconds_tgetLocalTimeMilliseconds(){  
    timeval buf;
    if( gettimeofday( &buf, 0 ))        
    memset( &buf, 0, sizeof( buf )); 
     return milliseconds_t( buf.tv_sec ) * 1000 + buf.tv_usec / 1000;
}

4.最终CMakeLists.txt

只需要把里面的${mp4v2_DIR}变量路径替换一下，就能跑了

cmake_minimum_required(VERSION 3.4.1)

set(CMAKE_VERBOSE_MAKEFILE on)
set(mp4v2_DIR ${CMAKE_SOURCE_DIR}/src/main/cpp/mp4v2)
file(GLOB mp4v2src ${mp4v2_DIR}/src/*.cpp)
file(GLOB mp4v2src_bmff ${mp4v2_DIR}/src/bmff/*.cpp)
file(GLOB mp4v2src_itmf ${mp4v2_DIR}/src/itmf/*.cpp)
file(GLOB mp4v2src_qtff ${mp4v2_DIR}/src/qtff/*.cpp)
file(GLOB mp4v2util ${mp4v2_DIR}/util/*.cpp)
file(GLOB mp4v2libutil "${mp4v2_DIR}/libutil/*.cpp")
file(GLOB mp4v2libplatform "${mp4v2_DIR}/libplatform/*.cpp")
file(GLOB mp4v2libplatform_time "${mp4v2_DIR}/libplatform/time/*.cpp")
file(GLOB mp4v2libplatform_number "${mp4v2_DIR}/libplatform/number/*.cpp")
file(GLOB mp4v2libplatform_io "${mp4v2_DIR}/libplatform/io/*.cpp")
file(GLOB mp4v2libplatform_process "${mp4v2_DIR}/libplatform/process/*.cpp")
file(GLOB mp4v2libplatform_prog "${mp4v2_DIR}/libplatform/prog/*.cpp")
file(GLOB mp4v2libplatform_sys "${mp4v2_DIR}/libplatform/sys/*.cpp")

include_directories(${mp4v2_DIR}
                    ${mp4v2_DIR}/include)
add_library( # Sets the name of the library.
             mp4v2
             # Sets the library as a shared library.
             STATIC
             # Provides a relative path to your source file(s).
             # Associated headers in the same location as their source
             # file are automatically included.
             ${mp4v2src}
             ${mp4v2src_bmff}
             ${mp4v2src_itmf}
             ${mp4v2src_qtff}
             ${mp4v2util}
             ${mp4v2libplatform}
             ${mp4v2libplatform_time}
             ${mp4v2libplatform_number}
             ${mp4v2libplatform_io}
             ${mp4v2libplatform_prog}
             ${mp4v2libplatform_sys}
             ${mp4v2libutil}
             )