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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/QuickTime/index.html">QuickTime</a> > <a href="../../samplecode/QuickTime/idxMovieCreation-date.html">Movie Creation</a> > <A HREF="javascript:location.replace('index.html');">SGDevices</A> >
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<h2>/SGUtils.m</h2>
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<p><strong>View Source Code:</strong>
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<p><strong><a href="SGDevices.zip">Download Sample</a></strong> (“SGDevices.zip”, 51.1K)<BR>
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<pre class="sourcecodebox">//////////
//
// File: SGUtils.m
//
// Contains: Implementation file for the SGUtils class.
//
// Written by: Apple Developer Technical Support
//
// Copyright: © 2002 by Apple Computer, Inc., all rights reserved.
//
// Change History (most recent first):
//
// <1> 10/7/02 srk first file
//
//////////
/*
IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. ("Apple") in
consideration of your agreement to the following terms, and your use, installation,
modification or redistribution of this Apple software constitutes acceptance of these
terms. If you do not agree with these terms, please do not use, install, modify or
redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject to these
terms, Apple grants you a personal, non-exclusive license, under Apple's copyrights in
this original Apple software (the "Apple Software"), to use, reproduce, modify and
redistribute the Apple Software, with or without modifications, in source and/or binary
forms; provided that if you redistribute the Apple Software in its entirety and without
modifications, you must retain this notice and the following text and disclaimers in all
such redistributions of the Apple Software. Neither the name, trademarks, service marks
or logos of Apple Computer, Inc. may be used to endorse or promote products derived from
the Apple Software without specific prior written permission from Apple. Except as expressly
stated in this notice, no other rights or licenses, express or implied, are granted by Apple
herein, including but not limited to any patent rights that may be infringed by your
derivative works or by other works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT,
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS
USE AND OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE,
REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND
WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR
OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#import "SGUtils.h"
@implementation SGUtils
//////////
//
// init
//
//////////
-(id)init
{
if (self == [super init])
{
videoChannel = NULL;
seqGrabber = NULL;
deviceList = NULL;
[self makeSGDeviceListForVideoChannel];
}
return self;
}
//////////
//
// makeSGDeviceListForVideoChannel
//
// Create a video channel and build a device list using this channel
//
//////////
-(void)makeSGDeviceListForVideoChannel
{
ComponentDescription theDesc;
Component sgCompID;
ComponentResult result;
// Find and open a sequence grabber
theDesc.componentType = SeqGrabComponentType;
theDesc.componentSubType = 0L;
theDesc.componentManufacturer = 'appl';
theDesc.componentFlags = 0L;
theDesc.componentFlagsMask = 0L;
sgCompID = FindNextComponent (NULL, &theDesc);
if (sgCompID != 0)
{
seqGrabber = OpenComponent (sgCompID);
if (seqGrabber)
{
result = SGInitialize (seqGrabber);
if (result == noErr)
{
// Get a video channel
result = SGNewChannel (seqGrabber, VideoMediaType, &videoChannel);
if (result == noErr)
{
/* build a device list */
result = SGGetChannelDeviceList(videoChannel,sgDeviceListIncludeInputs,&deviceList);
}
else /* error!! */
{
int choice;
choice = NSRunAlertPanel(@"Error", @"Couldn't create video channel - please connect a video device and try again", @"OK", nil, nil);
[NSApp terminate:self];
}
}
}
}
NSAssert(seqGrabber != 0, @"FindNextComponent failed");
NSAssert(sgCompID != 0, @"FindNextComponent failed");
NSAssert(result == noErr, @"SG call failed");
}
//////////
//
// getDeviceNameCount
//
// Returns the number of SGDeviceName structs - this is
// found from the count field in the SGDeviceListRecord struct:
//
// struct SGDeviceListRecord {
// short count;
// short selectedIndex;
// long reserved; /* zero*/
// SGDeviceName entry[1];
// };
//
//
//////////
-(short)getDeviceNameCount
{
NSAssert(deviceList != nil, @"nil device list");
return (*deviceList)->count;
}
//////////
//
// returnDeviceName
//
// Returns the string found in name field of the SGDeviceName structure for
// the specified SGDeviceName entry in the SGDeviceListRecord:
//
// struct SGDeviceName {
// Str63 name;
// Handle icon;
// long flags;
// long refCon;
// SGDeviceInputList inputs; /* list of inputs; formerly reserved to 0*/
// };
//
// struct SGDeviceListRecord {
// short count;
// short selectedIndex;
// long reserved; /* zero*/
// SGDeviceName entry[1];
// };
//
//
//////////
-(void)returnDeviceName:(Str63)name atIndex:(int)index
{
SGDeviceName nameRec;
NSAssert(deviceList != nil, @"nil device list");
NSAssert(index < (*deviceList)->count, @"index out of range");
nameRec =(*deviceList)->entry[index];
memcpy(name, nameRec.name, sizeof(Str63));
}
//////////
//
// getDeviceInputNameCount
//
// Returns the count of the SGDeviceInputName structs corresponding to
// the given SGDeviceName struct
//
// struct SGDeviceName {
// Str63 name;
// Handle icon;
// long flags;
// long refCon;
// SGDeviceInputList inputs; /* list of inputs; formerly reserved to 0*/
// };
//
// struct SGDeviceInputListRecord {
// short count;
// short selectedIndex;
// long reserved; /* zero*/
// SGDeviceInputName entry[1];
//};
//
//////////
-(short)getDeviceInputNameCount:(short)deviceNameIndex
{
SGDeviceName nameRec;
SGDeviceInputList deviceInputList = NULL;
NSAssert(deviceList != nil, @"nil device list");
NSAssert(deviceNameIndex < (*deviceList)->count, @"index out of range");
nameRec =(*deviceList)->entry[deviceNameIndex];
deviceInputList = nameRec.inputs;
if (deviceInputList)
{
return ((*deviceInputList)->count);
}
else
{
return 0;
}
}
//////////
//
// returnDeviceInputName
//
// Returns the name from the SGDeviceInputName struct corresponding to
// the given SGDeviceName struct
//
// struct SGDeviceInputName {
// Str63 name;
// Handle icon;
// long flags;
// long reserved; /* zero*/
// };
//
// struct SGDeviceName {
// Str63 name;
// Handle icon;
// long flags;
// long refCon;
// SGDeviceInputList inputs; /* list of inputs; formerly reserved to 0*/
// };
//
//////////
-(void)returnDeviceInputName:(Str63)name atIndex:(int)index forDeviceNameIndex:(int)deviceNameIndex
{
SGDeviceName nameRec;
SGDeviceInputList deviceInputList = NULL;
NSAssert(name != nil, @"bad name parameter");
nameRec =(*deviceList)->entry[deviceNameIndex];
deviceInputList = nameRec.inputs;
if (deviceInputList)
{
SGDeviceInputName inputNameRec;
inputNameRec = (*deviceInputList)->entry[index];
memcpy(name, inputNameRec.name, sizeof(Str63));
}
}
//////////
//
// dealloc
//
// Free up our device list
//
//////////
-(void)dealloc
{
SGDisposeDeviceList(seqGrabber, deviceList);
}
@end
</pre>
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