ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Working with video
Using image metadata
Flash Player 9 and later, Adobe AIR 1.0 and later
The onImageData event sends image data as a byte array through an AMF0 data channel. The data can be in JPEG,
PNG, or GIF formats. Define an onImageData() callback method to process this information, in the same way that
you would define callback methods for onCuePoint and onMetaData. The following example accesses and displays
image data using an onImageData() callback method:
public function onImageData(imageData:Object):void
{
// display track number
trace(imageData.trackid);
var loader:Loader = new Loader();
//imageData.data is a ByteArray object
loader.loadBytes(imageData.data);
addChild(loader);
}
Using text metadata
Flash Player 9 and later, Adobe AIR 1.0 and later
The onTextData event sends text data through an AMF0 data channel. The text data is in UTF-8 format and contains
additional information about formatting, based on the 3GP timed-text specification. This specification defines a
standardized subtitle format. Define an onTextData() callback method to process this information, in the same way
that you would define callback methods for onCuePoint or onMetaData. In the following example, the onTextData()
method displays the track ID number and corresponding track text.
public function onTextData(textData:Object):void
{
// display the track number
trace(textData.trackid);
// displays the text, which can be a null string, indicating old text
// that should be erased
trace(textData.text);
}
Monitoring NetStream activity
Flash Player 10.3 and later, Adobe AIR 2.7 and later
You can monitor NetStream activity to collect the information required to support media usage analysis and reporting.
The monitoring features discussed in this section allow you to create media measurement libraries that collect data
without close coupling to the particular video player displaying the media. This allows your client developers to choose
their favorite video players when using your library. Use the NetMonitor class to monitor the creation and activity of
NetStream objects in an application. The NetMonitor class provides a list of the active NetStreams existing at any given
time and also dispatches an event whenever a NetStream object is created.
A NetStream object dispatches the events listed in the following table, depending on the type of media being played:
Last updated 6/6/2012
501