/*

File: VideoChannel.m

Abstract:   The VideoChannel handles one movie with its navigation and rendering.

Version: 1.0

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*/ 

#import "VideoChannel.h"

#import <OpenGL/gl.h>

#import <OpenGL/glext.h>

#import "LiveVideoMixerController.h"

@implementation VideoChannel

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

+ (id)createWithFilePath:(NSString*)theFilePath forView:(VideoMixView*)inView

{

    return [[[VideoChannel alloc] initWithFilePath:theFilePath forView:inView] autorelease];

}

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

- (id)initWithFilePath:(NSString*)theFilePath forView:(VideoMixView*)inView;

{

    self = [super init];

    OSStatus            theError = noErr;

    Boolean         active = TRUE;

    UInt32          trackCount = 0;

    OSType          theTrackType;

    Track           theTrack = nil;

    Media           theMedia = nil;

    // setup the movie and the visual context - for simplicity in this example we assume a fixed movie size of 7220x480

    targetRect = NSMakeRect(0.0, 0.0, kVideoWidth, kVideoHeight);

    QTNewMoviePropertyElement newMovieProperties[] = {  {kQTPropertyClass_DataLocation, kQTDataLocationPropertyID_CFStringNativePath, sizeof(theFilePath), &theFilePath, 0},

                            {kQTPropertyClass_NewMovieProperty, kQTNewMoviePropertyID_Active, sizeof(active), &active, 0},

                            {kQTPropertyClass_Context, kQTContextPropertyID_VisualContext, sizeof(visualContext), &visualContext, 0},

                            };

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

                        [[NSOpenGLView defaultPixelFormat] CGLPixelFormatObj],

                        nil,

                        &visualContext);

    if(visualContext == NULL) 

    {

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

    return nil;

    }

    theError = NewMovieFromProperties(sizeof(newMovieProperties) / sizeof(newMovieProperties[0]), newMovieProperties, 0, nil, &channelMovie);

    if(theError)

    {

    NSLog(@"NewMovieFromProperties failed with %d", theError);

    return nil;

    }

    // setup the movie

    GoToBeginningOfMovie(channelMovie);

    SetTimeBaseFlags(GetMovieTimeBase(channelMovie), loopTimeBase);

    SetMoviePlayHints(channelMovie, hintsLoop, hintsLoop);

    trackCount = GetMovieTrackCount(channelMovie);

    // As we want to mix only the video channels, disable all the other tracks

    while(trackCount > 0)

    {

    theTrack = GetMovieIndTrack(channelMovie, trackCount);

    if(theTrack != nil)

    {

        theMedia = GetTrackMedia(theTrack);

        if(theMedia != nil)

        {               

        GetMediaHandlerDescription(theMedia, &theTrackType, 0, 0);

        if(theTrackType != VideoMediaType)

        {

            SetTrackEnabled(theTrack, false);       // disable all non video tracks

        }

        }

    }

    trackCount--;

    }

    return self;

}

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

- (void)dealloc

{

    DisposeMovie(channelMovie);

    [super dealloc];

}

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

- (void)prerollMovie:(Fixed)rate

{

    GoToBeginningOfMovie(channelMovie);

    MoviesTask(channelMovie, 0);

    PrerollMovie(channelMovie, 0, rate);

}

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

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

{

    if (NULL != masterTimeBase) 

    {

    // set the movie to run from the master timebase unless it is the same as its own

    TimeBase selfTimeBase = [self timeBase];

    if (masterTimeBase != selfTimeBase)

        SetTimeBaseMasterTimeBase(selfTimeBase, masterTimeBase, nil);

    }

    SetMovieRate(channelMovie, rate);   // this starts the playback of the movie

}

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

- (void)stopMovie

{

    StopMovie(channelMovie);

}

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

- (TimeBase)timeBase

{

    return GetMovieTimeBase(channelMovie);

}

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

- (void)_setCurrentTextureRef:(CVOpenGLTextureRef)inTextureRef

{

    // release the old texture

    CVOpenGLTextureRelease(currentTexture); 

    currentTexture = inTextureRef;

    //get the clean aperture texture coordinates

    CVOpenGLTextureGetCleanTexCoords(currentTexture, lowerLeft, lowerRight, upperRight, upperLeft);

}

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

- (BOOL)renderChannel:(const CVTimeStamp*)syncTimeStamp

{

    CVOpenGLTextureRef      newTextureRef = nil;

    QTVisualContextTask(visualContext);

    if(QTVisualContextIsNewImageAvailable(visualContext, syncTimeStamp))    // is a new frame available

    {

    QTVisualContextCopyImageForTime(visualContext, nil, syncTimeStamp, &newTextureRef); // get the texture for the frame

    [self _setCurrentTextureRef:newTextureRef];

    return YES; // we got a frame from QT

    } else {

        //NSLog(@"No Frame ready");

    }

    return NO;  // no frame ready

}

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

- (float)opacity

{

    return [channelOpacity floatValue] / 100.0; // the slider ranges from zero to 100 while alpha is normalize (0.0 to 1.0)

}

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

- (void)setTargetRect:(NSRect)inRect

{

    targetRect = inRect;

}

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

- (NSRect)targetRect

{

    return targetRect;

}

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

// drawOutline renders the red positioning rectangle

- (void)drawOutline:(NSRect)destRect

{

    glLoadIdentity();

    glActiveTextureARB(GL_TEXTURE1_ARB);

    glDisable(GL_TEXTURE_RECTANGLE_EXT);

    glDisable(GL_TEXTURE_2D);

    glActiveTextureARB(GL_TEXTURE0_ARB);

    glDisable(GL_TEXTURE_RECTANGLE_EXT);

    glDisable(GL_TEXTURE_2D);

    glPushAttrib(GL_POLYGON_BIT);

    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

    glMatrixMode(GL_TEXTURE);

    glLineWidth(1);

    glColor4f(1, 0, 0, 1);

    glBegin(GL_QUADS);            

        glVertex2f(destRect.origin.x, destRect.origin.y);

        glVertex2f(destRect.origin.x + destRect.size.width, destRect.origin.y);

        glVertex2f(destRect.origin.x + destRect.size.width, destRect.origin.y + destRect.size.height);

        glVertex2f(destRect.origin.x, destRect.origin.y + destRect.size.height);

    glEnd();

    glPopAttrib();

}

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

- (void)compositeChannelInRect:(NSRect)destRect;

{

    float               opacity = [self opacity];

    if(!channelShape)

    {

    // when no shape is used, we can simply render the texture of the current frame onto a quad.

    glEnable(CVOpenGLTextureGetTarget(currentTexture));

    glBindTexture(CVOpenGLTextureGetTarget(currentTexture), CVOpenGLTextureGetName(currentTexture));

    glMatrixMode(GL_TEXTURE);

    glLoadIdentity();

    glColor4f(1, 1, 1, opacity);

    glBegin(GL_QUADS);            

        glTexCoord2f(upperLeft[0], upperLeft[1]);

        glVertex2f  (destRect.origin.x, destRect.origin.y);

        glTexCoord2f(upperRight[0], upperRight[1]);

        glVertex2f  (destRect.origin.x + destRect.size.width, destRect.origin.y);

        glTexCoord2f(lowerRight[0], lowerRight[1]);

        glVertex2f  (destRect.origin.x + destRect.size.width, destRect.origin.y + destRect.size.height);

        glTexCoord2f(lowerLeft[0], lowerLeft[1]);

        glVertex2f  (destRect.origin.x, destRect.origin.y + destRect.size.height);

    glEnd();

    } else {

    // the user selected a shape so we use our shape textures as masks. This is done through multitexturing

    // setup the matte texture as a mask in texture unit 1

    glActiveTextureARB(GL_TEXTURE1_ARB);

    glEnable(kTextureTarget);

    glBindTexture(kTextureTarget, gTexNames[[channelShape intValue]]);  

    glMatrixMode(GL_TEXTURE);

    glLoadIdentity();

    // setup the image texture in texture unit 0

    glActiveTextureARB(GL_TEXTURE0_ARB);

    glEnable(CVOpenGLTextureGetTarget(currentTexture));

    glBindTexture(CVOpenGLTextureGetTarget(currentTexture), CVOpenGLTextureGetName(currentTexture));

    glMatrixMode(GL_TEXTURE);

    glLoadIdentity();

    // render both textures together

    glColor4f(1, 1, 1, opacity);

    glBegin(GL_QUADS);            

        glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0, 0);

        glMultiTexCoord2fARB(GL_TEXTURE0_ARB, upperLeft[0], upperLeft[1]);

        glVertex2f  ( destRect.origin.x, destRect.origin.y);

        glMultiTexCoord2fARB(GL_TEXTURE1_ARB, kVideoWidth, 0);

        glMultiTexCoord2fARB(GL_TEXTURE0_ARB, upperRight[0], upperRight[1]);

        glVertex2f  ( destRect.origin.x + destRect.size.width, destRect.origin.y);

        glMultiTexCoord2fARB(GL_TEXTURE1_ARB, kVideoWidth, kVideoHeight);

        glMultiTexCoord2fARB(GL_TEXTURE0_ARB, lowerRight[0], lowerRight[1]);

        glVertex2f  ( destRect.origin.x + destRect.size.width, destRect.origin.y + destRect.size.height);

        glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0, kVideoHeight);

        glMultiTexCoord2fARB(GL_TEXTURE0_ARB, lowerLeft[0], lowerLeft[1]);

        glVertex2f  ( destRect.origin.x, destRect.origin.y + destRect.size.height);

    glEnd();    

    glActiveTextureARB(GL_TEXTURE1_ARB);    // make sure the texture unit 1 is now disabled 

    glDisable(GL_TEXTURE_RECTANGLE_EXT);

    glDisable(GL_TEXTURE_2D);

    glActiveTextureARB(GL_TEXTURE0_ARB);

    // the speech bubble shape has a white frame/shape that has to be rendered on top of the masked content

    // this is done by rendering the texture on the quad.

    if([channelShape intValue] == kSpeechBubble)

    {

        glEnable(kTextureTarget);

        glBindTexture(kTextureTarget, gTexNames[kSpeechBubbleTextureID]);

        glMatrixMode(GL_TEXTURE);

        glLoadIdentity();

        glColor4f(1, 1, 1, 1);

        glBegin(GL_QUADS);            

            glTexCoord2f( 0, 0);

            glVertex2f  ( destRect.origin.x, destRect.origin.y);

            glTexCoord2f( kVideoWidth, 0);

            glVertex2f  ( destRect.origin.x + destRect.size.width, destRect.origin.y);

            glTexCoord2f( kVideoWidth, kVideoHeight);

            glVertex2f  ( destRect.origin.x + destRect.size.width, destRect.origin.y + destRect.size.height);

            glTexCoord2f( 0, kVideoHeight);

            glVertex2f  ( destRect.origin.x, destRect.origin.y + destRect.size.height);

        glEnd();

    }

    }

}

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

- (void)compositeChannelThumbnailInRect:(NSRect)destRect

{

    // for the thumbnail video we can simply render the texture on a quad as the thumbnail is 

    // not supposed to show the shape effect.

    glEnable(CVOpenGLTextureGetTarget(currentTexture));

    glBindTexture(CVOpenGLTextureGetTarget(currentTexture), CVOpenGLTextureGetName(currentTexture));

    glMatrixMode(GL_TEXTURE);

    glLoadIdentity();

    glColor4f(1, 1, 1, 1);

    glBegin(GL_QUADS);            

        glTexCoord2f(upperLeft[0], upperLeft[1]);

        glVertex2f  (destRect.origin.x, destRect.origin.y);

        glTexCoord2f(upperRight[0], upperRight[1]);

        glVertex2f  (destRect.origin.x + destRect.size.width, destRect.origin.y);

        glTexCoord2f(lowerRight[0], lowerRight[1]);

        glVertex2f  (destRect.origin.x + destRect.size.width, destRect.origin.y + destRect.size.height);

        glTexCoord2f(lowerLeft[0], lowerLeft[1]);

        glVertex2f  (destRect.origin.x, destRect.origin.y + destRect.size.height);

    glEnd();

}

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

@end