MACROMEDIA FLASH COMMUNICATION SERVER MX-SERVER-SIDE COMMUNICATION ACTIONSCRIPT DICTIONARY Spezifikationen PDF herunterladen (Seite 254)

Client-Side Communication ActionScript 63

The following steps summarize the sequence of actions required for publishing real-time audio

and video using Flash Communication Server and the Real-Time Messaging Protocol (RTMP):

1 Use new NetConnection to create a NetConnection object.

2 Use NetConnection.connect("rtmp://serverName/appName/appInstanceName") to

connect the application to the Flash Communication Server.

3 Use new NetStream(connection) to create a data stream over the connection.

4 Use NetStream.attachAudio(audioSource) to capture and send audio over the stream, and

NetStream.attachVideo(videoSource) to capture and send video over the stream.

5 Use NetStream.publish(publishName) to give this stream a unique name and send data

over the stream to the Flash Communication Server, so others can receive it. You can also

record the data as you publish it, so that users can play it back later.

Movies that subscribe to this stream will use the name specified here; that is, they will call the

same

NetConnection.connect method as the publisher, and then call a

NetStream.play(publishName) method. They will also have to call Video.attachVideo to

display the video.

Multiple streams can be open simultaneously over one connection, but each stream either

publishes or plays. To publish and play over a single connection, open two streams over the

connection, as shown in the following example. This example publishes audio and video data

in real time on one stream and plays it back on another stream on the same client, through the

same connection.

// These lines begin broadcasting

nc = new NetConnection(); // create connection object

nc.connect("rtmp://mySvr.myDomain.com/App"); // connect to server

ns = new NetStream(nc); // open stream within connection

ns.attachAudio(Microphone.get()); // capture audio

ns.attachVideo(Camera.get()); // capture video

ns.publish("todays_news"); // begin broadcasting

// These lines open a stream to play the video portion of the broadcast

// inside a Video object named myVideoArea.

// The audio is played through the standard output device--you don’t

// need to issue a separate command to hear the audio.

ns2 = new NetStream(nc); // open another stream over the same connection

myVideoArea.attachVideo(ns2); // specify where to display video

ns2.play("todays_news"); // play uses the same name as publish, above

In the previous example, note that both the publisher and subscriber call an attachVideo

method. The publisher calls

NetStream.attachVideo to connect a video feed to a stream. The

subscriber calls

Video.attachVideo to connect a video feed to a Video object on the Stage; the

incoming video is displayed inside this object.

Note also that although the publisher calls an

attachAudio method, the subscriber does not.

This is because audio sent through a stream is played through the subscriber’s standard audio

output device by default; the subscriber doesn’t have to attach the incoming audio to an object on

the Stage. However, you can use

MovieClip.attachAudio to route audio from a NetStream

object to a movie clip. If you do this, you can then create a Sound object to control the volume of

the sound. For more information, see

MovieClip.attachAudio.

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