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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<td><h1><div id="pagehead">QTCompressionOptionsWindow</div></h1></td>
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<h2>/QTCompressionOptionsWindow.m</h2>
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<pre class="sourcecodebox">//
// QTCompressionOptionsWindow.m
//
// A very simple window wrapper around the QTCompressionOptions object
// which can be used to bring up a UI listing the current compression
// options for use with QTCaptureFileOutput -compressionOptionsForConnection
/*
Disclaimer: IMPORTANT: This Apple software is supplied to you by
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Neither the name, trademarks, service marks or logos of Apple Inc.
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright (C) 2008 Apple Inc. All Rights Reserved.
*/
// QTCompressionOptionsWindow is a simple class that demonstrates how easy it is to manage the preset QTCapture media
// compression options encapsulated in a QTCompressionOptions object.
// The QTCompressionOptions class represents a set of compression options for a particular type of media.
// QTCompressionOptions objects are used to describe compression options for different kinds of media.
// Compression options are created from presets keyed by a named identifier such as @"QTCompressionOptions120SizeH264Video"
// or @"QTCompressionOptionsHighQualityAACAudio" but may also be returned dynamically using the
// +compressionOptionsIdentifiersForMediaType method.
#import "QTCompressionOptionsWindow.h"
@implementation QTCompressionOptionsWindow
#pragma mark ---- initialization ----
// designated initializer
// call with QTMediaTypeVideo or QTMediaTypeSound to initalize
- (id)initWithMediaType:(NSString *)inMediaType
{
// call NSWindowController designated initializer
if (self = [super initWithWindow:nil]) {
// inappropriate media types will bail on init
if ([self setMediaType:inMediaType]) {
[self release];
return nil;
}
}
return self;
}
#pragma mark ---- deallocation ----
- (void)dealloc
{
[mMediaType release];
[super dealloc];
}
#pragma mark ---- functions ----
// return the current media type being managed
- (NSString *)mediaType
{
return [[mMediaType retain] autorelease];
}
// set the media type of the compression options you want managed
- (OSStatus)setMediaType:(NSString *)inMediaType
{
// accept nil as a request for the default - the more common vide options
if (nil == inMediaType) inMediaType = QTMediaTypeVideo;
// only accept Video or Audio since they are the only valid compression option media types at this time
if ((NO == [inMediaType isEqualToString:QTMediaTypeVideo]) && (NO == [inMediaType isEqualToString:QTMediaTypeSound])) return invalidMedia;
// only do the set up if the media type has changed
if ([mMediaType isEqualToString:inMediaType]) return noErr;
[mMediaType release];
mMediaType = [inMediaType retain];
// make sure the nib is actually loaded at this time, required for our connections to the array controller and so on
if (![self isWindowLoaded]) { [self window]; }
// make sure the array controller is empty
[mOptionsArray removeObjects:[mOptionsArray arrangedObjects]];
// load it up with the currently chosen compression options objects
NSArray *optionsIdentifiers = [QTCompressionOptions compressionOptionsIdentifiersForMediaType:inMediaType];
NSEnumerator *enumerator = [optionsIdentifiers objectEnumerator];
UInt8 index;
UInt8 count = [optionsIdentifiers count];
for (index = 0; index < count; index++) {
QTCompressionOptions *options = [QTCompressionOptions compressionOptionsWithIdentifier:[enumerator nextObject]];
[mOptionsArray addObject:options];
}
[mOptionsArray setSelectionIndex:0];
return noErr;
}
// return the currently selected compression options object
- (QTCompressionOptions *)compressionOptions
{
return [[mOptionsArray selectedObjects] lastObject];
}
#pragma mark ---- actions ----
- (IBAction)closeWindow:(id)sender
{
[self close];
}
#pragma mark ---- subclassing behaviors ----
// window loaded
- (void)windowDidLoad
{
if (nil == mMediaType) {
// if a client of this class fails to set the media type
// but decides to show the window, set it here to the default
[self setMediaType:QTMediaTypeVideo];
}
}
// inform the client of this class that the window has been closed
// the client will then be able to ask for the currently selected
// compression options object
- (void)close
{
[super close];
if (nil != delegate && [delegate respondsToSelector:@selector(compressionOptionsWindowDidClose:)] ) {
[delegate compressionOptionsWindowDidClose:self];
}
}
// return the name of the nib file that stores the window
- (NSString *)windowNibName
{
return @"QTCompressionOptionsWindow";
}
#pragma mark ---- delegate ----
// manage deletates
- (id)delegate {
return delegate;
}
- (void)setDelegate:(id)inDelegate {
delegate = inDelegate;
}
@end</pre>
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