MACROMEDIA FLASH MEDIA SERVER 2-CLIENT-SIDE ACTIONSCRIPT LANGUAGE REFERENCE FOR FLASH MEDIA SERVER... Service manual

Client-Side ActionScript Language
Reference for Flash Media Server 2

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Acknowledgments
Project Management: Suzanne Smith
Writing: Jody Bleyle
Managing Editor: Rosana Francescato
Editing: Geta Carlson
Production Management: Patrice O’Neill
Media Design and Production: Adam Barnett, Aaron Begley, Mario Reynoso, Paul Benkman, John Franics
Special thanks to Erick Vera and the Flash Media Server engineering and QA teams.
First Edition: October 2005
Macromedia, Inc.
601 Townsend St.
San Francisco, CA 94103

3
Contents
Chapter 1: Client-Side ActionScript Language Reference. . . . . . . 5
ActionScript classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
ActionScript elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Camera class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Microphone class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
MovieClip class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
NetConnection class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
NetStream class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
SharedObject class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
System class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Video class. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139
Appendix A: Client-Side Information Objects . . . . . . . . . . . . . . .149
Camera information objects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
LocalConnection information objects . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Microphone information objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
NetConnection information objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
NetStream information objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .153
SharedObject information objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156

4Contents

5
1
CHAPTER 1
Client-Side ActionScript
Language Reference
Macromedia Flash Media Server provides two application program interfaces (APIs): a Client-
Side Media ActionScript API and a Server-Side Media ActionScript API. This guide explains
the client-side API.
This document is designed to be used in combination with the ActionScript documentation
included with Macromedia Flash. Refer to the Flash documentation for general scripting
information. Use this document to add Flash Media Server functionality to your Flash
applications.
For additional information about developing applications for Flash Media Server and to
understand how objects created on the client-side are paired with those on the server-Rside,
see Developing Media Applications.
ActionScript classes
The following table lists all the classes in this guide, Client-Side ActionScript Language
Reference for Flash Media Server 2:
NOTE
Most sample code in this document uses ActionScript 2.0 syntax.
ActionScript class Description
Camera class Lets you capture video from a video camera attached to the
computer that is running Macromedia Flash Player.
Microphone class Lets you capture audio from a microphone attached to the
computer that is running Flash Player.
MovieClip class Lets you specify whether an audio source is to be played locally
(Microphone object) or streamed from Flash Media Server
(NetStream object).

6 Client-Side ActionScript Language Reference
ActionScript elements
Entries in this document are alphabetical by class name and then by method, property, or
event handler name. The following table lists all classes, methods, properties, and event
handlers individually in alphabetical order.
NetConnection class Manages a bidirectional connection between Flash Player and a
server, which lets you connect to Flash Remoting or to Flash
Media Server.
NetStream class Opens a one-way streaming connection between Flash Player
and Flash Media Server through a connection made available by
a NetConnection object.
SharedObject class Allows real-time data sharing between multiple client SWF files
and objects that are persistent on the local or remote location.
System class The System class contains properties related to certain
operations that take place on the user's computer, such as
operations with shared objects, local settings for cameras and
microphones, and use of the Clipboard.
Video class Lets you display live or recorded streaming video on the Stage
without embedding it in your SWF file.
ActionScript element See entry
activityLevel Camera.activityLevel, Microphone.activityLevel
attachAudio MovieClip.attachAudio(), NetStream.attachAudio()
attachVideo NetStream.attachVideo(), Video.attachVideo()
bandwidth Camera.bandwidth
bufferLength NetStream.bufferLength
bufferTime NetStream.bufferTime
call NetConnection.call()
clear SharedObject.clear(), Video.clear()
close NetConnection.close(), NetStream.close(),
SharedObject.close()
connect NetConnection.connect(), SharedObject.connect()
currentFps Camera.currentFps, NetStream.currentFps
data SharedObject.data
ActionScript class Description

ActionScript elements 7
deblocking Video.deblocking
flush SharedObject.flush()
fps Camera.fps
gain Microphone.gain
get Camera.get(), Microphone.get()
getLocal SharedObject.getLocal()
getRemote SharedObject.getRemote()
getSize SharedObject.getSize()
height Camera.height, Video.height
index Camera.index, Microphone.index
isConnected NetConnection.isConnected
keyFrameInterval Camera.keyFrameInterval
loopback Camera.loopback
liveDelay NetStream.liveDelay
motionLevel Camera.motionLevel
motionTimeOut Camera.motionTimeOut
muted Camera.muted, Microphone.muted
name Camera.name, Microphone.name
names Camera.names, Microphone.names
onActivity Camera.onActivity, Microphone.onActivity
onCuePoint NetStream.onCuePoint
onMetaData NetStream.onMetaData
onPlayStatus NetStream.onPlayStatus
onStatus Camera.onStatus, Microphone.onStatus, NetConnection.onStatus,
NetStream.onStatus, SharedObject.onStatus
onSync SharedObject.onSync
pause NetStream.pause()
play NetStream.play()
publish NetStream.publish()
quality Camera.quality
ActionScript element See entry

8 Client-Side ActionScript Language Reference
Camera class
Availability
■Flash Player 6.
■Flash Media Server (not required).
rate Microphone.rate
receiveAudio NetStream.receiveAudio()
receiveVideo NetStream.receiveVideo()
seek NetStream.seek()
send NetStream.send(), SharedObject.send()
setBufferTime NetStream.setBufferTime()
setFps SharedObject.setFps()
setGain Microphone.setGain()
setKeyFrameInterval Camera.setKeyFrameInterval()
setLoopback Camera.setLoopback()
setMode Camera.setMode()
setMotionLevel Camera.setMotionLevel()
setQuality Camera.setQuality()
setRate Microphone.setRate()
setSilenceLevel Microphone.setSilenceLevel()
setUseEchoSuppression Microphone.setUseEchoSuppression()
showSettings System.showSettings()
silenceLevel Microphone.silenceLevel
silenceTimeout Microphone.silenceTimeout
smoothing Video.smoothing
time NetStream.time
uri NetConnection.uri
useCodepage System.useCodepage
useEchoSuppression Microphone.useEchoSuppression
width Camera.width, Video.width
ActionScript element See entry

Camera class 9
The Camera class lets you capture video from a video camera attached to the computer that is
running Macromedia Flash Player. When used with Flash Media Server, this class lets you
transmit, display, and optionally record the video being captured. With these capabilities, you
can develop media applications such as video conferencing, instant messaging with video, and
so on. Flash provides similar audio capabilities; for more information, see the Microphone
class entry.
You can also use a Camera object without a server—for example, to monitor a video feed from
a webcam attached to your local system.
To create or reference a Camera object, use the Camera.get() method.
Method summary for the Camera class
NOTE
When a SWF file tries to access the camera returned by Camera.get(), Flash Player
displays a Privacy dialog box that lets the user choose whether to allow or deny access
to the camera. (Make sure your Stage size is at least 215 x 138 pixels for the Camera
class examples; this is the minimum size Flash requires to display the dialog box.) End
users and administrative users may also disable camera access on a per-site or global
basis.
Method Description
Camera.get() Returns a reference to a Camera object for capturing
video.
Camera.setKeyFrameInterval() Specifies which video frames are transmitted in full
instead of being interpolated by the video compression
algorithm.
Camera.setLoopback() Specifies whether to use a compressed video stream for a
local view of what the camera is transmitting.
Camera.setMode() Sets aspects of the camera capture mode, including
height, width, and frames per second.
Camera.setMotionLevel() Specifies how much motion is required to invoke
Camera.onActivity(true).
Camera.setQuality() Sets the maximum amount of bandwidth per second or
the required picture quality of the current outgoing video
feed.

10 Client-Side ActionScript Language Reference
Property summary for the Camera class
Property (read-only) Description
Camera.activityLevel A numeric value from 0 to 100 that specifies the amount of
motion the camera is detecting.
Camera.bandwidth The maximum amount of bandwidth the current outgoing
video feed can use, in bytes.
Camera.currentFps The rate at which the camera is capturing data, in frames per
second.
Camera.fps The rate at which you would like the camera to capture data, in
frames per second.
Camera.height The current capture height, in pixels.
Camera.index The index of the camera, as reflected in the array returned by
Camera.names.
Camera.keyFrameInterval A number that specifies which video frames are transmitted in
full instead of being interpolated by the video compression
algorithm.
Camera.loopback A Boolean value that specifies whether a local view of what
the camera is capturing is compressed or uncompressed.
Camera.motionLevel A numeric value from 0 to 100 that specifies the amount of
motion required to invoke Camera.onActivity(true).
Camera.motionTimeOut The number of milliseconds between the time the camera
stops detecting motion and the time
Camera.onActivity(false) is invoked.
Camera.muted A Boolean value that specifies whether the user has allowed
or denied access to the camera.
Camera.name The name of the camera as specified by the camera hardware.
Camera.names Class property; an array of strings containing the names of all
available video capture devices, including video capture cards
and cameras.
Camera.quality A number that specifies the current level of picture quality
based on the amount of compression being applied to each
video frame.
Camera.width The current capture width, in pixels.

Camera class 11
Event handler summary for the Camera class
Constructor for the Camera class
See Camera.get().
Camera.activityLevel
Availability
■Flash Player 6.
■Flash Media Server (not required).
Usage
public activityLevel : Number [read-only]
Description
Property (read-only); a numeric value that specifies the amount of motion the camera is
detecting. Values range from 0 (no motion is being detected) to 100 (a large amount of
motion is being detected). The value of this property can help you determine if you need to
pass a setting to Camera.setMotionLevel().
If the camera is available but is not yet being used because neither Video.attachVideo() nor
NetStream.attachVideo() has been called, this property is set to -1.
If you are streaming only uncompressed local video—that is, you are not streaming the video
within a NetStream object and you have not called Camera.setLoopback()(true)—this
property is set only if you have assigned a function to the Camera.onActivity event handler.
Otherwise, it is undefined.
See also
Camera.motionLevel, Camera.onActivity, Camera.setMotionLevel()
Method Description
Camera.onActivity Invoked when the camera starts or stops detecting motion.
Camera.onStatus Invoked when the user allows or denies access to the camera.

12 Client-Side ActionScript Language Reference
Camera.bandwidth
Availability
■Flash Player 6.
■Flash Media Server (not required).
Usage
public bandwidth : Number [read-only]
Description
Property (read-only); an integer that specifies the maximum amount of bandwidth the current
outgoing video feed can use, in bytes. A value of 0 means that Flash Video can use as much
bandwidth as needed to maintain the desired frame quality.
To set this property, use Camera.setQuality().
Example
The following example changes the maximum amount of bandwidth used by the camera feed.
Create a new video instance by selecting New Video from the Library options menu. Add an
instance to the Stage and give it the instance name my_video. Add a NumericStepper
component instance to the Stage and give it the instance name bandwidth_nstep. Then add
the following ActionScript to Frame 1 of the Timeline:
var bandwidth_nstep:mx.controls.NumericStepper;
var my_video:Video;
var my_cam:Camera = Camera.get();
my_video.attachVideo(my_cam);
this.createTextField("bandwidth_txt", this.getNextHighestDepth(), 0, 0,
100, 22);
bandwidth_txt.autoSize = true;
this.onEnterFrame = function() {
bandwidth_txt.text = "Camera is currently using "+my_cam.bandwidth+"
bytes ("+Math.round(my_cam.bandwidth/1024)+" KB) bandwidth.";
};
//
bandwidth_nstep.minimum = 0;
bandwidth_nstep.maximum = 128;
bandwidth_nstep.stepSize = 16;
bandwidth_nstep.value = my_cam.bandwidth/1024;
function changeBandwidth(evt:Object) {
my_cam.setQuality(evt.target.value/1024, 0);
}
bandwidth_nstep.addEventListener("change", changeBandwidth);

Camera class 13
The MovieClip.getNextHighestDepth() method used in this example requires Flash Player
7 or later. If your SWF file includes a v2 component (version 2 of the Macromedia
Component Architecture), use the DepthManager class from the component framework
instead of the MovieClip.getNextHighestDepth() method.
See also
Camera.setQuality()
Camera.currentFps
Availability
■Flash Player 6.
■Flash Media Server (not required).
Usage
public currentFps : Number [read-only]
Description
Property (read-only); the rate at which the camera is capturing data, in frames per second.
This property cannot be set; however, you can use Camera.setMode() to set a related
property—Camera.fps—which specifies the maximum frame rate at which you would like
the camera to capture data.
Example
The following example detects the rate in frames per second that the camera captures data,
using the currentFps property and a ProgressBar instance. Create a new video instance by
selecting New Video from the Library options menu. Add an instance to the Stage and give it
the instance name my_video. Add a ProgressBar component instance to the Stage and give it
the instance name fps_pb. Then add the following ActionScript to Frame 1 of the Timeline:
var my_video:Video;
var fps_pb:mx.controls.ProgressBar;
var my_cam:Camera = Camera.get();
my_video.attachVideo(my_cam);
this.onEnterFrame = function() {
fps_pb.setProgress(my_cam.fps-my_cam.currentFps, my_cam.fps);
};
fps_pb.setStyle("fontSize", 10);
fps_pb.setStyle("themeColor", "haloOrange");
fps_pb.labelPlacement = "top";
fps_pb.mode = "manual";
fps_pb.label = "FPS: %2 (%3%% dropped)";

14 Client-Side ActionScript Language Reference
See also
Camera.fps, Camera.setMode()
Camera.fps
Availability
■Flash Player 6.
■Flash Media Server (not required).
Usage
public fps : Number [read-only]
Description
Property (read-only); the maximum rate at which you want the camera to capture data, in
frames per second. The maximum rate possible depends on the capabilities of the camera; that
is, if the camera doesn’t support the value you set here, this frame rate will not be achieved.
■To set a desired value for this property, use Camera.setMode().
■To determine the rate at which the camera is currently capturing data, use
Camera.currentFps.
Example
The following example detects the rate in frames per second that the camera captures data,
using the currentFps property and a ProgressBar instance. Create a new video instance by
selecting New Video from the Library options menu. Add an instance to the Stage and give it
the instance name my_video. Add a ProgressBar component instance to the Stage and give it
the instance name fps_pb. Then add the following ActionScript to Frame 1 of the Timeline:
var my_video:Video;
var fps_pb:mx.controls.ProgressBar;
var my_cam:Camera = Camera.get();
my_video.attachVideo(my_cam);
this.onEnterFrame = function() {
fps_pb.setProgress(my_cam.fps-my_cam.currentFps, my_cam.fps);
};
fps_pb.setStyle("fontSize", 10);
fps_pb.setStyle("themeColor", "haloOrange");
fps_pb.labelPlacement = "top";
fps_pb.mode = "manual";
fps_pb.label = "FPS: %2 (%3%% dropped)";
NOTE
The setMode() method does not guarantee the requested fps setting; it sets the fps you
requested or the fastest fps available.

Camera class 15
See also
Camera.currentFps, Camera.setMode()
Camera.get()
Availability
■Flash Player 6.
■Flash Media Server (not required).
Usage
public static get([index:Number]) : Camera
Parameters
index An optional zero-based integer that specifies which camera driver to get, as
determined from the array returned by Camera.names. To get the default camera driver
(which is recommended for most applications), omit this parameter.
Returns
■If index is not specified, this method returns a reference to the default camera driver or, if
it is in use by another application, to the first available camera driver. (If there is more
than one camera driver installed, the user may specify the default camera driver in the
Flash Player Camera Settings panel.) If no camera drivers are available or installed, the
method returns null.
■If index is specified, this method returns a reference to the requested camera driver, or
null if it is not available.
Description
Method; returns a reference to a Camera object for capturing video. To actually begin
capturing the video, you must attach the Camera object either to a Video object (see
Video.attachVideo()) or to a NetStream object (see NetStream.attachVideo()). (The
NetStream object is available only with Flash Media Server.)
NOTE
To assign the Camera object to a variable, use the following syntax:
var active_cam:Camera = Camera.get().
NOTE
The Camera.get() method returns a reference to a camera driver, not to a physical
camera.

16 Client-Side ActionScript Language Reference
Unlike objects that you create using the new constructor, multiple calls to Camera.get()
reference the same camera driver. Thus, if your script contains the lines
cam1 = Camera.get() and cam2 = Camera.get(), both cam1 and cam2 reference the same
(default) camera driver.
In general, you shouldn’t pass a value for index; simply use Camera.get() to return a
reference to the default camera driver. By means of the Camera settings panel (discussed later
in this section), the user can specify the default camera driver Flash should use. If you pass a
value for index, you might be trying to reference a camera driver other than the one the user
prefers. You might use index in rare cases—for example, if your application is capturing video
from two cameras at the same time.
When a SWF file tries to access the camera returned by Camera.get()—for example, when
you issue NetStream.attachVideo() or Video.attachVideo()—Flash Player displays a
Privacy dialog box that lets the user choose whether to allow or deny access to the camera.
(Make sure your Stage size is at least 215 by 138 pixels; this is the minimum size Flash
requires to display the dialog box.)
When the user responds to this dialog box, the Camera.onStatus event handler returns an
information object that indicates the user’s response. To determine whether the user has
denied or allowed access to the camera without processing this event handler, use
Camera.muted.
The user can also specify permanent privacy settings for a particular domain by right-clicking
(Windows) or Control-clicking (Macintosh) while a SWF file is playing and selecting
Settings. When the Privacy dialog box opens, the user selects Remember.
You can’t use ActionScript to set the Allow or Deny value for a user, but you can display the
Privacy dialog box for the user by using System.showSettings(0). If the user selects
Remember, Flash Player no longer displays the Privacy dialog box for SWF files from this
domain.
If Camera.get() returns null, either the camera is in use by another application, or there are
no cameras installed on the system. To determine whether any cameras are installed, use
Camera.names.length. To display the Flash Player Camera Settings panel, which lets the
user choose the camera driver to be referenced by Camera.get(), use
System.showSettings(3).

Camera class 17
Scanning the hardware for cameras takes time. When Flash finds at least one camera, the
hardware is not scanned again for the lifetime of the Flash Player instance. However, if Flash
doesn’t find any cameras, it will scan each time Camera.get() is called. This is helpful if a
user has forgotten to connect the camera; if your SWF file provides a Try Again button
that calls Camera.get(), Flash can find the camera without the user having to restart the
SWF file.
Example
The following example lets you select an active camera to use from a ComboBox instance.
The current active camera is displayed in a Label instance. Create a new video instance by
selecting New Video from the Library options menu. Add an instance to the Stage and give it
the instance name my_video. Add a Label component instance to the Stage and give it the
instance name camera_lbl, and a ComboBox component instance and give it the instance
name cameras_cb. Then add the following ActionScript to Frame 1 of the Timeline:
var my_cam:Camera = Camera.get();
var my_video:Video;
my_video.attachVideo(my_cam);
var camera_lbl:mx.controls.Label;
var cameras_cb:mx.controls.ComboBox;
camera_lbl.text = my_cam.name;
cameras_cb.dataProvider = Camera.names;
function changeCamera():Void {
my_cam = Camera.get(cameras_cb.selectedIndex);
my_video.attachVideo(my_cam);
camera_lbl.text = my_cam.name;
}
cameras_cb.addEventListener("change", changeCamera);
camera_lbl.setStyle("fontSize", 9);
cameras_cb.setStyle("fontSize", 9);
See also
Camera.index, Camera.muted, Camera.names, Camera.onStatus, Camera.setMode(),
NetStream.attachVideo(), System.showSettings(), Video.attachVideo()

18 Client-Side ActionScript Language Reference
Camera.height
Availability
■Flash Player 6.
■Flash Media Server (not required).
Usage
public height : Number [read-only]
Description
Property (read-only); the current capture height, in pixels. To set a value for this property, use
Camera.setMode().
Example
The following code displays the current width, height and FPS of a video instance in a Label
component instance on the Stage. Create a new video instance by selecting New Video from
the Library options menu. Add an instance to the Stage and give it the instance name
my_video. Add a Label component instance to the Stage and give it the instance name
dimensions_lbl. Then add the following ActionScript to Frame 1 of the Timeline:
var my_cam:Camera = Camera.get();
var my_video:Video;
my_video.attachVideo(my_cam);
var dimensions_lbl:mx.controls.Label;
dimensions_lbl.setStyle("fontSize", 9);
dimensions_lbl.setStyle("fontWeight", "bold");
dimensions_lbl.setStyle("textAlign", "center");
dimensions_lbl.text = "width: "+my_cam.width+", height: "+my_cam.height+",
FPS: "+my_cam.fps;
See also the example for Camera.setMode().
See also
Camera.setMode(), Camera.width
Camera.index
Availability
■Flash Player 6.
■Flash Media Server (not required).

Camera class 19
Usage
active_cam.index
Description
Property (read-only); a zero-based integer that specifies the index of the camera, as reflected in
the array returned by Camera.names.
Example
The following example displays an array of cameras in a text field that is created at runtime,
and tells you which camera you are currently using. Create a new video instance by selecting
New Video from the Library options menu. Add an instance to the Stage and give it the
instance name my_video. Add a Label component instance to the Stage and give it the
instance name camera_lbl. Then add the following ActionScript to Frame 1 of the Timeline:
var camera_lbl:mx.controls.Label;
var my_cam:Camera = Camera.get();
var my_video:Video;
my_video.attachVideo(my_cam);
camera_lbl.text = my_cam.index+". "+my_cam.name;
this.createTextField("cameras_txt", this.getNextHighestDepth(), 25, 160,
160, 80);
cameras_txt.html = true;
cameras_txt.border = true;
cameras_txt.wordWrap = true;
cameras_txt.multiline = true;
for (var i = 0; i<Camera.names.length; i++) {
cameras_txt.htmlText += "<li><u><a
href=\"asfunction:changeCamera,"+i+"\">"+Camera.names[i]+"</a></u></
li>";
}
function changeCamera(index:Number) {
my_cam = Camera.get(index);
my_video.attachVideo(my_cam);
camera_lbl.text = my_cam.index+". "+my_cam.name;
}
The MovieClip.getNextHighestDepth() method used in this example requires Flash Player
7 or later. If your SWF file includes a v2 component (version 2 of the Macromedia
Component Architecture), use the DepthManager class from the component framework
instead of the MovieClip.getNextHighestDepth() method.
See also
Camera.get(), Camera.names

20 Client-Side ActionScript Language Reference
Camera.keyFrameInterval
Availability
■Flash Player 6.
■Flash Media Server (not required).
Usage
public keyFrameInterval : Number [read-only]
Description
Property (read-only); a number that specifies which video frames are transmitted in full
(called keyframes) instead of being interpolated by the video compression algorithm. The
default value is 15 (every 15th frame is a keyframe).
See also
Camera.setKeyFrameInterval()
Camera.loopback
Availability
■Flash Player 6.
■Flash Media Server (not required).
Usage
public loopback : Boolean [read-only]
Description
Property (read-only); a Boolean value that specifies whether a local view of what the camera is
capturing is compressed and decompressed as it would be for live transmission using Flash
Media Server (true) or uncompressed (false). The default value is false.
To set this value, use Camera.setLoopback(). To set the amount of compression used when
this property is true, use Camera.setQuality().
Example
See the example for Camera.setLoopback().
See also
Camera.setLoopback(), Camera.setQuality()