/*

File: CaptureChannel.m

Abstract:   The CaptureChannel handles the rendering of frames from the video input through QTCapture.

Version: 1.0

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*/ 

#import "CaptureChannel.h"

#import "LiveVideoMixerController.h"

@implementation CaptureChannel

+ (id)createWithQTCaptureDevice:(QTRDeviceSet*)theDevice forView:(VideoMixView*)inView

{

    return [[[CaptureChannel alloc] initWithQTCaptureDevice:theDevice forView:inView] autorelease];

}

//--------------------------------------------------------------------------------------------------

- (id)initWithQTCaptureDevice:(QTRDeviceSet*)theDevice forView:(VideoMixView*)inView

{

    OSStatus        theError = noErr;

    self = [super init];

    targetRect = NSMakeRect(0.0, 0.0, kVideoWidth, kVideoHeight);   // hard coded video size

    // Create the visual context

    theError = QTOpenGLTextureContextCreate(nil, [[inView sharedContext] CGLContextObj],

                        [[NSOpenGLView defaultPixelFormat] CGLPixelFormatObj],

                        nil,

                        &visualContext);

    if(visualContext == NULL) 

    {

        NSLog(@"QTVisualContext creation failed with error:%d", theError);

        [self dealloc];

        return nil;

    }

    // Create a capture session

    captureSession = [[QTCaptureSession alloc] init];

    [captureSession setDelegate:self];

    [captureSession setEnabled:NO];

    // Add the newly selected input device(s) to the capture session

    switch ([theDevice deviceSetType])

    {

        case 0: // Muxed

            [captureSession addInput:[QTCaptureDeviceInput deviceInputWithDevice:[theDevice muxedCaptureDevice]] error:nil];

            break;

        case 1: // Video-only

            [captureSession addInput:[QTCaptureDeviceInput deviceInputWithDevice:[theDevice videoCaptureDevice]] error:nil];

            break;

        case 2: // Audio-only

            [captureSession addInput:[QTCaptureDeviceInput deviceInputWithDevice:[theDevice audioCaptureDevice]] error:nil];

            break;

        case 3: // Audio-video

            [captureSession addInput:[QTCaptureDeviceInput deviceInputWithDevice:[theDevice audioCaptureDevice]] error:nil];

            [captureSession addInput:[QTCaptureDeviceInput deviceInputWithDevice:[theDevice videoCaptureDevice]] error:nil];

            break;

        default:

            break;

    }

    // Attach output based on our visual context to session

    captureOutput = [[QTCaptureVideoPreviewOutput alloc] init];

    [captureSession addOutput:captureOutput error:nil];

    [captureOutput setVisualContext:visualContext forChannel:[[captureOutput connectedChannels] objectAtIndex:0]];

    [captureSession setEnabled:YES];

    return self;

}

//--------------------------------------------------------------------------------------------------

- (void)dealloc

{

    [captureSession release];

    [captureOutput release];

    [super dealloc];

}   

//--------------------------------------------------------------------------------------------------

- (void)prerollMovie:(Fixed)rate

{

    // do nothing here

}

//--------------------------------------------------------------------------------------------------

- (void)startMovie:(Fixed)rate usingMasterTimeBase:(TimeBase)masterTimeBase

{

    // do nothing here

}

//--------------------------------------------------------------------------------------------------

- (void)stopMovie

{

    // do nothing here

}

//--------------------------------------------------------------------------------------------------

- (TimeBase)timeBase

{

    return 0;   // no timebase available

}

//--------------------------------------------------------------------------------------------------

@end