在一些实时视频或视频分享应用中,需要动态显示麦克风的音量大小,或者检测视频是不是正在播放,这里演示一种简单的音量指示器 1.先写一个指示器类
其实就是一个根据百分比来填充的矩形
package {
import flash.display.Sprite;
//音量指示器(by 菩提树下的杨过 http://yjmyzz.cnblogs.com/)
public class Indicator extends Sprite {
private var _w:uint;
private var _h:uint;
private var _bColor:uint;
private var _bgColor:uint;
private var _fColor:uint;
private var _current:Number;
public function Indicator(w:uint=150,h:uint=15,borderColor:uint=0x000000,bgColor:uint=0xffffff,fillColor:uint=0xff6600,current:Number=0.3):void {
//trace("Indicator");
this._w=w;
this._h=h;
this._bColor=borderColor;
this._bgColor=bgColor;
this._fColor=fillColor;
this._current=current;
if (_current>=1) {
_current=1;
} else if (_current<=0) {
_current=0;
}
init();
}
public function set Current(v:Number):void {
_current=v;
if (_current>=1) {
_current=1;
} else if (_current<=0) {
_current=0;
}
init();
}
public function get Current():Number {
return (_current);
}
private function init():void {
graphics.clear();
graphics.lineStyle(1,_bColor);
//先画背景色
graphics.beginFill(_bgColor);
graphics.drawRect(-1*_w/2,-1*_h/2,_w,_h);
graphics.endFill();
//再画当前值
graphics.lineStyle(1,_bColor,0);
graphics.beginFill(_fColor);
var _per:Number=_w*_current;
graphics.drawRect(-1*_w/2 +0.5 ,-1*_h/2 +0.5,_per,_h-1);
graphics.endFill();
}
}
}
2.如何获取音量大小以及监测摄像头直播状态
音量大小可以通过activityLevel属性获得,但摄像头的画面变化程度却无法直接获取,但每当摄像头画面有活动时ACTIVITY事件将被触发,所以可在该事件中监测最后一次活动的时间与当前时间做比较,从而判断画面有多久没有变化了。
var videoInd:Indicator=new Indicator(100,10,0x000000,0xffffff);
var audioInd:Indicator=new Indicator(100,10,0x000000,0xffffff);
addChild(videoInd);
addChild(audioInd);
//初始化视频/音频指示器位置
videoInd.x=stage.stageWidth/2 + 30;
videoInd.y=-100;
audioInd.x=stage.stageWidth/2 + 30;
audioInd.y=-100;
txtMsg.y = stage.stageHeight/2 - txtMsg.height/2;
txtMsg.width = stage.stageWidth;
var cam:Camera;
var mic:Microphone;
var video:Video;
var videoIsWorked=false;
var lastVideoActiveData:Date = new Date();
var timer:Timer = new Timer(100,20);//每隔100ms检测摄像头状态,一共检测20次
function startCheckVideo() {
cam=Camera.getCamera();
if (cam==null) {
txtMsg.text="未安装摄像头!";
return;
}
cam.addEventListener(StatusEvent.STATUS, statusHandler);
cam.addEventListener(ActivityEvent.ACTIVITY,camActivityHandler);
video=new Video(cam.width,cam.height);
//trace("视频宽度:" + cam.width + ",视频高度:" + cam.height);
video.height = 120;
video.width = 160;
video.x=stage.stageWidth/2-video.width/2;
video.y=10;
video.attachCamera(cam);//执行这句时,flash才会弹出摄像头是否允许使用提示框
}
//摄像头有活动时,被触发
function camActivityHandler(e:ActivityEvent) {
//trace("camActivityHandler:" + new Date().toString());
if (!videoIsWorked) {
timer.addEventListener(TimerEvent.TIMER,TimerHandler);
timer.addEventListener(TimerEvent.TIMER_COMPLETE,timerCompleteHandler);
timer.start();
}
lastVideoActiveData = new Date();//记录本次视频活动时间
}
//回调函数
function TimerHandler(e:TimerEvent):void {
txtMsg.text="摄像头视频获取中..." ;
if (cam.currentFPS>0) {
timer.stop();
addChild(video);//加载到当前舞台中
videoInd.y=video.y+video.height+10;
audioInd.y=videoInd.y + videoInd.height + 10;
txtVideo.text = "视频状态:"
txtVideo.y = videoInd.y - 8
txtVideo.x = videoInd.x - videoInd.width -20 ;
txtAudio.text = "音频状态:"
txtAudio.y = audioInd.y - 8
txtAudio.x = audioInd.x - audioInd.width -20 ;
if (txtMsg!=null) {
removeChild(txtMsg);
}
videoIsWorked=true; //摄像头工作正常
this.addEventListener(Event.ENTER_FRAME,EnterFrameHandler);
}
}
function timerCompleteHandler(e:TimerEvent):void{
txtMsg.text="设备无法使用(有可能被占用)";
}
//用户选择"同意"或"不允许"使用摄像头时触发
function statusHandler(e:StatusEvent) {
if (e.code=="Camera.Muted") {
txtMsg.text="您不允许使用摄像头!";
} else if (e.code == "Camera.Unmuted") {
txtMsg.text="摄像头视频获取中...";
camActivityHandler(null);//重要:在release模式下,webCam的Activity事件不会自动触发(Adobe的bug?),所以要显式手动调用一次
}
}
//开始检测麦克风
function startCheckAudio():void{
mic = Microphone.getMicrophone();
mic.setLoopBack(true);//将采集到的声音回发到扬声器(否则自己听不到自己的声音,不方便测试)
}
function EnterFrameHandler(e:Event):void{
var curDate:Date = new Date();
var _timeSpan:Number = curDate.time - lastVideoActiveData.time;
if (_timeSpan >= 30 * 1000){
trace("您的视频已经超过30秒没动静了!");
videoInd.Current = 0;
}
else{
videoInd.Current = Math.random() * 0.1;//视频指示器
}
if (mic!=null){
audioInd.Current = 0.05 + mic.activityLevel/100;//音量指示器
}
}
txtMsg.text="正在检测摄像头...";
startCheckVideo();
startCheckAudio();
源文件:http://cid-2959920b8267aaca.skydrive.live.com/self.aspx/Flash/webCamStatus.rar