QuickTime Kit Programming Guide - filibeto.org

C H A P T E R 5
Extending the QTKitPlayer To Stream Audio and Video
Figure 5-2 The movie window launched by the QTKitPlayer to stream audio and video with the big blue Q
at its center
When you click the play button in the control bar at the lower left, your application will send a request
to a server to fetch the audio or video stream with the RTSP protocol identifier. A few seconds later,
the stream will appear in the player window. You can then resize the window accordingly, as you
wish.
You’ll follow the same procedure as defined in the previous chapter: identify the tasks to accomplish,
construct and wire together the necessary objects for your user interface, and then add the code to
make it work.
Tasks to Accomplish
The tasks you need to accomplish to extend the capability of your streaming QTKitPlayer are more
complex than those described in the previous chapter. You’ll build on the existing QTKitPlayer
application, using the tools available to you in Interface Builder 2.5 and Xcode 2.0. But you’ll also be
adding more code to the project to deal with the handling of URL streams. You’ll do this:
1. Construct an OpenURL panel in Interface Builder with a ComboBox object for entering a movie
URL.
2. Add actions and outlets to the OpenURL panel you’ve constructed.
3. Add a new menu item to the File menu to open the URL.
4. Subclass NSObject with a QTKitAppDelegate class in your MainMenu.nib and wire it up to handle
the opening of a URL in your OpenURL panel.
5. Add to your Xcode project a new OpenURLPanel.h declaration file in which you define the class
methods, getters and setters, delegates, notifications, and actions for your URL panel.
6. Add an OpenURLPanel.m implementation file in which you get the URL from a string, validate
and save the URL, and inform the delegate before closing down the URL panel.
7. Add an QTKitPlayerAppDelegate.h class interface file to your project with IBActions for opening
the URL panel.
8. Add an QTKitPlayerAppDelegate.m implementation file to your project in order to create the
movie document from the URL.
80 Tasks to Accomplish
2005-11-09 | © 2004, 2005 Apple Computer, Inc. All Rights Reserved.