volume

docker容器管理和数据管理

僤鯓⒐⒋嵵緔 提交于 2019-11-26 15:31:13
1、概念 容器类似于一个linux环境,是通过镜像创建启动的,可以理解为在镜像的最上一层创建一个可读写层,镜像本身是只读的,容器的读写不会改变镜像。 2、容器管理 2.1容器的创建 #docker run -itd --name nginx1 nginx:latest 基本的创建携带 i t d这三个参数即可,表示的意义分别如下; -i: 以交互模式运行容器,通常与 -t 同时使用; -d: 后台运行容器,并返回容器ID; -t: 为容器重新分配一个伪输入终端,通常与 -i 同时使用; nginx1和nginx:latest分别表示创建的容器名和所使用的镜像,创建完成后使用 docker ps 命令即可看到新建并运行的容器 #docker run -itd --name nginx2 -p 8080:80 nginx:latest 指定映射端口,将容器中的80端口映射到宿主机的8080端口上;这样就可以通过访问宿主机的8080端口达到访问容器的目的 #docker run -itd --name nginx3 --cpus 1 nginx:latest 限制cpu最大可用核数 #docker run -itd --name nginx5 --cpu-shares 512 nginx:latest 设置cpu的权重,默认值为1024;不设置或将其设置为0,均使用默认值

Android: MediaPlayer setVolume function

℡╲_俬逩灬. 提交于 2019-11-26 15:06:06
about the params Set what to make the player no sound and full sound Thanks This function is actualy wonderful. Thanks to it you can create a volume scale with any number of steps! Let's assume you want 50 steps: int maxVolume = 50; Then to set setVolume to any value in this range (0-49) you do this: float log1=(float)(Math.log(maxVolume-currVolume)/Math.log(maxVolume)); yourMediaPlayer.setVolume(log1,log1); //set volume takes two paramater Nice and easy! And DON'T use AudioManager to set volume! It will cause many side effects such as disabling silent mode, which will make your users mad!

kvm存储虚拟机介绍

纵饮孤独 提交于 2019-11-26 12:09:19
KVM 的存储虚拟化是通过存储池(Storage Pool)和卷(Volume)来管理的。 Storage Pool 是宿主机上可以看到的一片存储空间,可以是多种型; Volume 是在 Storage Pool 中划分出的一块空间,宿主机将 Volume 分配给虚拟机,Volume 在虚拟机中看到的就是一块硬盘。 二、目录类型的 Storage Pool 文件目录是最常用的 Storage Pool 类型。KVM 将宿主机目录 /var/lib/libvirt/images/ 作为默认的 Storage Pool Volume 是该目录下面的文件了,一个文件就是一个 Volume。 那 KVM 是怎么知道要把 /var/lib/libvirt/images 这个目录当做默认 Storage Pool 的呢? 实际上 KVM 所有可以使用的 Storage Pool 都定义在宿主机的 /etc/libvirt/storage 目录下,每个 Pool 一个 xml 文件,如下: 默认有一个 default.xml,其内容如下:注意:Storage Pool 的类型是 “dir”,目录的路径就是/var/lib/libvirt/images 三、创建Storage Pool (1)在 virt-manager 中打开一台虚拟机,为其添加硬盘,执行如下: (2)选择管理,弹出如下对话框

HTML5 <audio> playback with fade in and fade out

佐手、 提交于 2019-11-26 12:09:01
问题 I\'d like to start and stop HTML5 playback in a random position with fade in and fade out periods to smooth the listening experience. What kind of mechanisms exists for this? Manually ramp up the volume with setTimeout()? 回答1: The jQuery way... $audio.animate({volume: newVolume}, 1000); Edit: where $audio is a jQuery-wrapped audio element and newVolume is a double between 0 and 1. Edit: The element's effective media volume is volume, interpreted relative to the range 0.0 to 1.0, with 0.0

How to calculate the volume of a 3D mesh object the surface of which is made up triangles

烂漫一生 提交于 2019-11-26 11:43:30
I want to calculate the volume of a 3D mesh object having a surface made up triangles. Frank Krueger Reading this paper , it is actually a pretty simple calculation. The trick is to calculate the signed volume of a tetrahedron - based on your triangle and topped off at the origin. The sign of the volume comes from whether your triangle is pointing in the direction of the origin. (The normal of the triangle is itself dependent upon the order of your vertices, which is why you don't see it explicitly referenced below.) This all boils down to the following simple function: public float

Is it possible to programmatically mute the iPhone?

白昼怎懂夜的黑 提交于 2019-11-26 11:35:43
问题 I\'ve seen techniques to make sure that an app respects the mute switch, but is it possible to set the iPhone to mute (no sounds from any apps) using the SDK? 回答1: No. Applications developed using the official SDK cannot change (and in most cases cannot even access) system-wide settings. 回答2: It is possible, but only using private API's. I only went as far as muting the ringer, but you should be able to control the master level as well. See How to disable iOS System Sounds 回答3: It is

applicationMusicPlayer volume notification

限于喜欢 提交于 2019-11-26 10:54:44
问题 I am using an applicationMusicPlayer and when i try to change the volume appear the visual notification, as shown in the picture. Here the code I am using: [MPMusicPlayerController applicationMusicPlayer] setVolume:newVolune]; Anyone knows how to hide this notification? 回答1: I don't know where the docs says so, but if you add a MPVolumeView view to your app the system volume overlay goes away. Even if it is not visible: - (void) viewDidLoad { [super viewDidLoad]; MPVolumeView *volumeView = [

Can Java Sound be used to control the system volume?

风格不统一 提交于 2019-11-26 09:54:48
问题 Java Sound offers FloatControl instances for various sound line functionality, and both a MASTER_GAIN & VOLUME control type. Can these controls be used to change the system volume? 回答1: No, it cannot. Here is source adapted from an answer to Adjusting master volume on coderanch. The source iterates the available lines, checks if they have a control of the right type, and if so, puts them in a GUI attached to a JSlider import java.awt.*; import javax.swing.*; import javax.sound.sampled.*;

iOS: Change Device Volume

血红的双手。 提交于 2019-11-26 09:09:01
问题 Is there a way to change the volume of the device? I\'ve seen several apps do it. I have a desktop version of the iOS app and the device will be able to be controlled to some extent over the network. One of the things I want to allow the user to do is change the device volume and then play a sound. This can help if you loose your iPhone in a crack in your couch again, but can\'t find it. Is there any way that you can do this without Apple getting angry? 回答1: Using iPodMusicPlayer would affect

How to display a 3D plot of a 3D array isosurface in matplotlib mplot3D or similar?

偶尔善良 提交于 2019-11-26 08:52:27
问题 I have a 3-dimensional numpy array. I\'d like to display (in matplotlib) a nice 3D plot of an isosurface of this array (or more strictly, display an isosurface of the 3D scalar field defined by interpolating between the sample points). matplotlib\'s mplot3D part provides nice 3D plot support, but (so far as I can see) its API doesn\'t have anything which will simply take a 3D array of scalar values and display an isosurface. However, it does support displaying a collection of polygons, so