/*

File: OpenGLDVExporter.m

Abstract: Implements the OpenGLQTCompressor class.

Version: 1.0

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*/

#import <OpenGL/CGLMacro.h>

#import "OpenGLDVExporter.h"

@implementation OpenGLDVExporter

+ (NSSize) sizeForFormat:(DVFormat)format

{

    switch(format) {

        case kDVFormat_NTSC: return NSMakeSize(720, 480);

        case kDVFormat_PAL: return NSMakeSize(720, 576);

    }

    return NSZeroSize;

}

+ (float) framerateForFormat:(DVFormat)format

{

    switch(format) {

        case kDVFormat_NTSC: return 29.97;

        case kDVFormat_PAL: return 25.00;

    }

    return 0.0;

}

- (id) initWithOpenGLContext:(NSOpenGLContext*)context pixelsWide:(unsigned)width pixelsHigh:(unsigned)height codec:(CodecType)codec quality:(CodecQ)quality flipVertically:(BOOL)flip useTextures:(BOOL)textures

{

    //Make sure client goes through designated initializer

    [self doesNotRecognizeSelector:_cmd];

    return nil;

}

- (id) initWithOpenGLContext:(NSOpenGLContext*)context dvFormat:(DVFormat)format flipVertically:(BOOL)flip useTextures:(BOOL)textures

{

    CodecType                       codec = (format == kDVFormat_NTSC ? kDVCNTSCCodecType : kDVCPALCodecType);

    NSSize                          size = [OpenGLDVExporter sizeForFormat:format];

    GWorldPtr                       displayGWorld;

    OSErr                           theError;

    //Check parameters

    if((format != kDVFormat_NTSC) && (format != kDVFormat_PAL)) {

        [self release];

        return nil;

    }

    //Initialize super class

    if(self = [super initWithOpenGLContext:context pixelsWide:size.width pixelsHigh:size.height codec:codec quality:codecMaxQuality flipVertically:flip useTextures:textures]) {

        //Create FireWire DV video out QuickTime component

        _displayImageDescription = (ImageDescriptionHandle) NewHandleClear(sizeof(ImageDescription));

        if(_displayImageDescription == NULL) {

            NSLog(@"Memory allocation failed");

            [self release];

            return nil;

        }

        (**_displayImageDescription).idSize = sizeof(ImageDescription);

        (**_displayImageDescription).cType = codec;

        (**_displayImageDescription).width = size.width;

        (**_displayImageDescription).height = size.height;

        (**_displayImageDescription).spatialQuality = codecNormalQuality;

        (**_displayImageDescription).depth = 24;

        (**_displayImageDescription).hRes = 72 << 16;

        (**_displayImageDescription).vRes = 72 << 16;

        (**_displayImageDescription).clutID = -1;

        theError = OpenADefaultComponent(QTVideoOutputComponentType, 'fire', &_displayComponent);

        if(theError == noErr)

        QTVideoOutputSetClientName(_displayComponent, "DV Exporter");

        theError = QTVideoOutputSetDisplayMode(_displayComponent, (format == kDVFormat_NTSC ? 1 : 2)); //NOTE: 1 = NTSC and 2 = PAL

        if(theError == noErr)

        theError = QTVideoOutputBegin(_displayComponent);

        if(theError == noErr)

        theError = QTVideoOutputGetGWorld(_displayComponent, &displayGWorld);

        if(theError == noErr)

        theError = DecompressSequenceBeginS(&_displayImageSequence, _displayImageDescription, nil, 0, displayGWorld, NULL, &_frameBounds, nil, srcCopy, nil, 0, codecNormalQuality, anyCodec);

        if(theError) {

            NSLog(@"Video out component creation failed (error %i)", theError);

            [self release];

            return nil;

        }

    }

     return self; 

}

- (void) dealloc

{

    //Destroy resources

    if(_displayImageSequence)

    CDSequenceEnd(_displayImageSequence);

    if(_displayComponent) {

        QTVideoOutputEnd(_displayComponent);

        CloseComponent(_displayComponent);

    }

    if(_displayImageDescription)

    DisposeHandle((Handle)_displayImageDescription);

    [super dealloc];

}

- (BOOL) exportFrame

{

    CodecFlags                      inFlags = 0;

    CodecFlags                      outFlags = 0;

    NSData*                         data;

    OSErr                           theError;

    //Call super class to compress a frame

    data = [super compressFrame:YES];

    if(data == nil)

    return NO;

    if(![data length])

    return YES;

    //Send compressed frame data to FireWire DV

    theError = DecompressSequenceFrameS(_displayImageSequence, (Ptr)[data bytes], [data length], inFlags, &outFlags, nil);

    if(theError) {

        NSLog(@"DecompressSequenceFrameS() failed with error %i", theError);

        return NO;

    }

    return YES;

}

@end