ActionScript3.0 video

发布时间:2012-11-24 01:37:45

ActionScript3.0 video

源文地址:http://www.cnblogs.com/wayne23/archive/2010/07/15/1778077.html

1. 控制视频声音

使用NetStream对象的soundTransform属性

package {

import flash.display.Sprite;

import flash.events.MouseEvent;

import flash.media.SoundTransform;

import flash.media.Video;

import flash.net.NetConnection;

import flash.net.NetStream;

public class Sample0623 extends Sprite

{

private var ns:NetStream;

public function Sample0623()

{

var nc:NetConnection = new NetConnection();

nc.connect(null);

ns = new NetStream(nc);

ns.client = this;

var video:Video = new Video();

video.attachNetStream(ns);

ns.play("demo.flv");

stage.addEventListener(MouseEvent.CLICK,onClick);

this.addChild(video);

}

private function onClick(event:MouseEvent):void

{

var transform:SoundTransform = ns.soundTransform;

transform.volume = .2;

ns.soundTransform = transform;

}

public function onMetaData(infoObject:Object):void

{

for(var proName:String in infoObject)

{

trace(proName+":"+infoObject[proName]);

}

}

}

}

2. 获得播放时间(播放头)

使用NetStream对象的time属性,单位为秒。

textField.text = netStream.time + " seconds";

注意其值没有经过四舍五入,也就是说有时候得到数可能诸如5.235,如果需要整数,可使用Math.round(), Math.floor(), 或Math.ceil()

time属性是只读的

3. 获得视频总时间

使用onMetaData()回调函数读取duration源数据值,单位为秒

NetStream类没有定义一个属性指明视频长度,不过大多数情况,可以从flv文件的元数据获得长度值

当一个NetStream对象载入一个flv文件,它会自动调用onMetaData( )回调方法,该回调模型不同于ActionScript 3.0 API 中的一般事件模型,一般情况下我们通过使用addEventListener( ). 对一个事件进行监听,但是元数据事件必须为一个对象定义一个叫onMetaData( )方法,然后把这个对象赋值给NetStream对象的client属性。该方法自动传递一个类型为Object的关联数组,其包含flv文件的元数据信 息

package {

import flash.display.Sprite;

import flash.media.Video;

import flash.net.NetConnection;

import flash.net.NetStream;

public class Sample0623 extends Sprite

{

private var ns:NetStream;

public function Sample0623()

{

var nc:NetConnection = new NetConnection();

nc.connect(null);

ns = new NetStream(nc);

var client:Object = new Object();

client.onMetaData = onMetaData;

ns.client = client;

var video:Video = new Video();

video.attachNetStream(ns);

ns.play("demo.flv");

this.addChild(video);

}

private function onMetaData(data:Object):void

{

trace(data.duration);

}

}

}

4. 控制播放时间(播放头位置)

使用NetStream的seek()方法

当使用seek()时,Flash播放器将搜寻最接近于指定位置(从流的开始位置算起的偏移量,以秒为单位)的关键帧。到达该位置时,流将恢复播放

视频搜寻的确切位置取决于导出视频时的帧频率 (fps) 设置。 因此,如果以 6 fps 和 30 fps 的帧频率导出同一个视频,并对两个视频对象都使用myStream.seek(15),则这两个视频将搜寻两个不同的位置

如要返回到该流的开始处,请seek(0)

package {

import flash.display.Sprite;

import flash.events.MouseEvent;

import flash.media.Video;

import flash.net.NetConnection;

import flash.net.NetStream;

public class Sample0623 extends Sprite

{

private var ns:NetStream;

public function Sample0623()

{

var nc:NetConnection = new NetConnection();

nc.connect(null);

ns = new NetStream(nc);

var client:Object = new Object();

client.onMetaData = onMetaData;

ns.client = client;

var video:Video = new Video();

video.attachNetStream(ns);

ns.play("demo.flv");

stage.addEventListener(MouseEvent.CLICK,onClick);

this.addChild(video);

}

private function onClick(event:MouseEvent):void

{

ns.seek(ns.time + 15);

}

private function onMetaData(data:Object):void

{

}

}

}

5. 改变视频的显示尺寸

设置Video对象的width和height属性

Video类定义了两个只读属性:videoWidthvideoHeight,他们返回视频编码时的尺寸,可以用这两个属性设置Video的width和height值

video.width = video.videoWidth;

video.height = video.videoHeight;

需要注意的是,flv还没下载之前这两个属性是不可用的,因此必须等两个属性可用时才行,可以监听netStatus事件达到目的:

PS: NetConnectionNetStream对象报告其状态时,将调度NetStatusEvent对象。只有一种类型的状态事件:NetStatusEvent.NET_STATUS

package {

import flash.display.Sprite;

import flash.events.NetStatusEvent;

import flash.media.Video;

import flash.net.NetConnection;

import flash.net.NetStream;

public class Sample0623 extends Sprite

{

public function Sample0623()

{

var nc:NetConnection = new NetConnection();

nc.addEventListener(NetStatusEvent.NET_STATUS,onNetStatus);

nc.connect(null);

}

private function onNetStatus(event:NetStatusEvent):void

{

if(event.info.code=="NetConnection.Connect.Success")

{

var ns:NetStream = new NetStream(event.target as NetConnection);

ns.addEventListener(NetStatusEvent.NET_STATUS,onNetStatus);

ns.client = this;

ns.play("demo2.flv");

var video:Video = new Video();

video.attachNetStream(ns);

if(video.videoWidth>0 && video.width!=video.videoWidth)

{

video.width = video.videoWidth;

video.height = video.videoHeight;

}

this.addChild(video);

}

}

public function onMetaData(infoObject:Object):void

{

}

}

}

6. 管理和监视缓冲及下载进度

利用NetStream的以下属性:

bufferTime -- 缓冲区大小。可设置(单位为秒),默认为0.1秒

bufferLength -- 已进入缓冲区的秒数

bufferLength / bufferTime -- 已缓冲的百分比

bytesLoaded -- 已下载的字节数

bytesTotal -- 总字节数

bytesLoaded / bytesTotal -- 已下载的百分比

package {

import flash.display.Sprite;

import flash.events.Event;

import flash.events.MouseEvent;

import flash.media.Video;

import flash.net.NetConnection;

import flash.net.NetStream;

import flash.text.TextField;

import flash.text.TextFieldAutoSize;

public class Sample0623 extends Sprite

{

private var textBox:TextField;

private var ns:NetStream;

public function Sample0623()

{

//Video 

var nc:NetConnection = new NetConnection();

nc.connect(null);

ns = new NetStream(nc);

ns.client = this;

ns.bufferTime = 5;

ns.play("demo.flv");

var video:Video = new Video();

video.attachNetStream(ns);

this.addChild(video);

//Text 

textBox = new TextField();

textBox.autoSize = TextFieldAutoSize.CENTER;

textBox.multiline = true;

textBox.x = 100;

textBox.y = 250;

this.addChild(textBox);

stage.addEventListener(Event.ENTER_FRAME,onEnterFrame);

}

private function onEnterFrame(event:Event):void

{

textBox.text = "";

textBox.appendText("缓冲区大小是:"+ns.bufferTime+"\n");

textBox.appendText("已进入缓冲区的秒数:"+ns.bufferLength+"\n");

textBox.appendText("已缓冲的百分比:"+ Math.round((ns.bufferLength/ns.bufferTime)*100) +"%\n");

textBox.appendText("已下载的字节数:"+ns.bytesLoaded+"\n");

textBox.appendText("总字节数:"+ns.bytesTotal+"\n");

textBox.appendText("已下载的百分比:"+ Math.round((ns.bytesLoaded/ns.bytesTotal)*100) +"%\n");

}

public function onMetaData(infoObject:Object):void

{

}

}

}

7. 监听flv的提示点

使用onCuePoint( )回调函数

onMetaData( ) 一样onCuePoint( )方法定义为Object,然后赋值给NetStream对象的client属性。onCuePoint( )方法接受一个参数,类型为object,属性有:

name -- 提示点的名称

time -- 提示点所在位置的时间

type -- 无论是"event"或"navigation," 都由编码时所选择的类型决定

parameters -- key/value 对组成的关联数组

package {

import flash.display.Sprite;

import flash.media.Video;

import flash.net.NetConnection;

import flash.net.NetStream;

public class Sample0623 extends Sprite

{

public function Sample0623()

{

var nc:NetConnection = new NetConnection();

nc.connect(null);

var ns:NetStream = new NetStream(nc);

var client:Object = new Object( );

client.onCuePoint = onCuePoint;

ns.client = client;

ns.play("demo2.flv");

var video:Video = new Video();

video.attachNetStream(ns);

this.addChild(video);

}

public function onCuePoint(cuePoint:Object):void

{

trace(cuePoint.name + ":" + cuePoint.time);

}

}

}

8. 暂停和继续播放视频

使用NetStream对象的pause()和resume()方法

package {

import flash.display.Sprite;

import flash.events.MouseEvent;

import flash.media.Video;

import flash.net.NetConnection;

import flash.net.NetStream;

public class Sample0624 extends Sprite

{

private var ns:NetStream;

private var isPause:Boolean = false;

public function Sample0624()

{

var nc:NetConnection = new NetConnection();

nc.connect(null);

ns = new NetStream(nc);

var client:Object = new Object();

client.onMetaData = onMetaData;

ns.client = client;

ns.play("demo.flv");

var video:Video = new Video;

video.attachNetStream(ns);

this.addChild(video);

stage.addEventListener(MouseEvent.CLICK,onClick);

}

private function onClick(event:MouseEvent):void

{

if(isPause)

{

ns.resume();

isPause = false;

}

else

{

ns.pause();

isPause = true;

}

}

private function onMetaData(infoObject:Object):void

{

trace(infoObject.duration);

}

}

}

9. 停止播放视频

使用NetStream类的close()方法

pause()方法只是暂停播放,flv数据还是在继续下载,如果要完全停止视频下载,必须使用close()方法

当调用close()方法后,Flash Player删除内存中的flv数据,要想播放需要重新下载一遍。但是浏览器可能已经缓存了flv数据,因此第二次播放可能会快一些,但是这可能导致不适 最新的数据,如果想每次都是播放最新的数据,可以再url上加上唯一字符串,如下面的代码:

netStream.play("video.flv?uniqueIndex=" + (new Date()).getTime());

如果因为数字版权问题不想视频数据被缓存,就不能使用渐进式下载视频,这种情况可使用流播放,例如可使用Flash Media Server

10. 快进或快退播放(滑块控制)

package {

import flash.display.Sprite;

import flash.events.Event;

import flash.events.MouseEvent;

import flash.geom.Rectangle;

import flash.media.Video;

import flash.net.NetConnection;

import flash.net.NetStream;

public class Sample0624 extends Sprite

{

private var ns:NetStream;

private var timeLine:Sprite;

private var bar:Sprite;

private var videoTime:Number;

private var barIsUp:Boolean = true;

private var barIsMove:Boolean = false;

public function Sample0624()

{

//Video 

var nc:NetConnection = new NetConnection();

nc.connect(null);

ns = new NetStream(nc);

var client:Object = new Object();

client.onMetaData = onMetaData;

ns.client = client;

ns.play("demo.flv");

var video:Video = new Video();

video.attachNetStream(ns);

this.addChild(video);

timeLine = new Sprite;

timeLine.graphics.beginFill(0x000000);

timeLine.graphics.drawRect(0,0,200,3);

timeLine.graphics.endFill();

timeLine.x = 50;

timeLine.y = 250;

this.addChild(timeLine);

bar = new Sprite();

bar.graphics.beginFill(0xFFFF00);

bar.graphics.drawRect(0,0,8,15);

bar.graphics.endFill();

bar.y = -6;

bar.addEventListener(MouseEvent.MOUSE_DOWN,onMouseDown);

bar.addEventListener(MouseEvent.MOUSE_UP,onMouseUp);

timeLine.addChild(bar);

stage.addEventListener(Event.ENTER_FRAME,onEnterFrame);

}

private function onEnterFrame(event:Event):void

{

if(barIsUp)

{

var percent:Number = bar.x / 200;

ns.seek(bar.x / timeLine.width * videoTime);

barIsUp = false;

}

else

{

if(!barIsMove)

{

bar.x = ns.time / videoTime * 200;

}

}

}

private function onMouseDown(event:MouseEvent):void

{

var rectangle:Rectangle = new Rectangle(0,-6,timeLine.width-8,0);

bar.startDrag(false,rectangle);

barIsMove = true;

}

private function onMouseUp(event:MouseEvent):void

{

bar.stopDrag();

barIsUp = true;

barIsMove = false;

}

private function onMetaData(infoObject:Object):void

{

videoTime = infoObject.duration;

}

}

}

ActionScript3.0 video

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