av_gettime()是以什么时间为标准

Saint

int64_t av_gettime(void)
{      
#if HAVE_GETTIMEOFDAY
    struct timeval tv;
    gettimeofday(&tv, NULL);
    return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
#elif HAVE_GETSYSTEMTIMEASFILETIME
    FILETIME ft;
    int64_t t;
    GetSystemTimeAsFileTime(&ft);
    t = (int64_t)ft.dwHighDateTime << 32 | ft.dwLowDateTime;
    return t / 10 - 11644473600000000; /* Jan 1, 1601 */
#else
    return -1;
#endif
}

孙悟空

     return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
usec为微秒