plugins/crazychat/QTUtilities.c

/*
	File:		QTUtilities.c
	
	Description: Miscellaneous QuickTime utility routines.

	Copyright: 	© Copyright 2003 Apple Computer, Inc. All rights reserved.
	
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	Change History (most recent first):

*/

#include "QTUtilities.h"
#include "Utilities.h"

#define BailErr(x) {if (x != noErr) goto bail;}

//////////
//
// GetMovieFromFile
// Opens a movie file, then creates a new movie for the file
//
//////////

OSErr GetMovieFromFile(FSSpec *fsspecPtr, Movie *theMovie)
{
	short	resRefNum = -1;
    OSErr	result;

    *theMovie = NULL;
    
	result = OpenMovieFile(fsspecPtr, &resRefNum, 0);
	if (result == noErr)
    {
        short actualResId = DoTheRightThing;
        
        result = NewMovieFromFile(theMovie, 
                                resRefNum, 
                                &actualResId, 
                                (unsigned char *) 0,
                                0,
                                (Boolean *) 0);
        CloseMovieFile(resRefNum);
    }
    
    return result;
}

//////////
//
// GetAMovieFile
// Prompt the user for a movie file, then open
// the file and create a movie for it.
//
//////////

OSErr GetAMovieFile(Movie *theMovie)
{
    OSType 	myTypeList[2] = {kQTFileTypeMovie, kQTFileTypeQuickTimeImage};
    FSSpec	theFSSpec;
    OSErr	result = noErr;

    *theMovie = nil;
    
    result = GetOneFileWithPreview(2, myTypeList, &theFSSpec, NULL);
    if (result != userCanceledErr)
    {            
        result = GetMovieFromFile(&theFSSpec, theMovie);
    }
    
    return result;
}

//////////
//
// NormalizeMovieRect
//
//////////

void NormalizeMovieRect(Movie theMovie)
{
    Rect movieBounds;
    
	GetMovieBox(theMovie, &movieBounds);
	OffsetRect(&movieBounds, -movieBounds.left, -movieBounds.top);
	movieBounds.right = movieBounds.left + 640;
	movieBounds.bottom = movieBounds.top + 480;
	SetMovieBox(theMovie, &movieBounds);
}

//////////
//
// EraseRectAndAlpha
// Zeros out a section of the GWorld, including alpha.
//
//////////

void EraseRectAndAlpha(GWorldPtr gWorld, Rect *pRect)
{
	PixMapHandle	pixMap = GetGWorldPixMap(gWorld);
	long			rows;
	Ptr				rowBaseAddr;


    LockPixels(pixMap);
	rows = pRect->bottom - pRect->top;
    
    rowBaseAddr = GetPixBaseAddr(pixMap) + (GetPixRowBytes(pixMap) & 0x3fff) * pRect->top + pRect->left * GetPixDepth(pixMap) / 8;
	do
	{
		long	cols;
		UInt32	*baseAddr;
		
		cols = pRect->right - pRect->left;
		baseAddr = (UInt32*)rowBaseAddr;
		rowBaseAddr += (**pixMap).rowBytes & 0x3fff;
		do
		{
			*baseAddr++ = 0;
		} while (--cols);
	} while (--rows);

    UnlockPixels(pixMap);

} // EraseRectAndAlpha

//////////
//
// CreateDecompSeqForSGChannelData
// Create a decompression sequence for the passed
// Sequence Grabber channel data
//
//////////

OSErr CreateDecompSeqForSGChannelData(SGChannel sgChannel, Rect *srcBounds, GWorldPtr imageDestination, ImageSequence *imageSeqID)
{
	OSErr err = noErr;
	
	ImageDescriptionHandle	imageDesc = (ImageDescriptionHandle)NewHandle(sizeof(ImageDescription));
	if (imageDesc)
	{

		err = SGGetChannelSampleDescription(sgChannel,(Handle)imageDesc);
		// The original version of this code had a bug - it passed in a Crop Rect to DecompressSequenceBegin instead of a scaling matrix
		// This only worked because of another bug inside QT that reated the crop Rect as a destination rect for DV
		// the following code does the right thing in all cases.
		
		if (err == noErr)
		{
			MatrixRecord 	mr;
			Rect 			fromR;

			fromR.left = 0;
			fromR.top = 0;
			fromR.right = (**imageDesc).width;
			fromR.bottom = (**imageDesc).height;
			RectMatrix(&mr, &fromR, srcBounds);
			
			err = DecompressSequenceBegin(imageSeqID, imageDesc, imageDestination, 0, nil, &mr,srcCopy,nil,0, codecNormalQuality, bestSpeedCodec);
		}
		
		DisposeHandle((Handle)imageDesc);
	}
	else
	{
		err = MemError();
	}
	
	return err;
}


//////////
//
// CreateDecompSeqForGWorldData
// Create a decompression sequence for the specified gworld data
//
//////////

OSErr CreateDecompSeqForGWorldData(GWorldPtr srcGWorld, Rect *srcBounds, MatrixRecordPtr mr, GWorldPtr imageDestination, ImageSequence *imageSeqID)
{
    OSErr err;
    
    ImageDescriptionHandle imageDesc = (ImageDescriptionHandle)NewHandle(sizeof(ImageDescription));
    if (imageDesc)
    {
        err = MakeImageDescriptionForPixMap (GetGWorldPixMap(srcGWorld), &imageDesc);
        err = DecompressSequenceBegin(	imageSeqID, 
                                        imageDesc, 
                                        imageDestination, 
                                        0, 
                                        srcBounds, 
                                        mr, 
                                        srcCopy, 
                                        nil, 
                                        0, 
                                        codecNormalQuality, 
                                        bestSpeedCodec);
        DisposeHandle((Handle)imageDesc);
    }
    else
    {
        err = MemError();
    }
    
    return err;
}

//////////
//
// CreateNewSGChannelForRecording
// - create a new Sequence Grabber video channel
// - let the use configure the channel
// - set the channel bounds, usage
// - set a data proc for the channel
// - start recording data
//
//////////

OSErr CreateNewSGChannelForRecording(ComponentInstance seqGrab, SGDataUPP dataProc, CGrafPtr drawPort, Rect *theRect, SGChannel *sgChannel, long refCon)
{
	OSErr err = noErr;
	
	BailErr((err = SGInitialize(seqGrab)));

	// tell it we're not making a movie
	BailErr((err = SGSetDataRef(seqGrab,0,0,seqGrabDontMakeMovie)));
	// It wants a port, even if its not drawing to it
	BailErr((err = SGSetGWorld(seqGrab, drawPort, GetMainDevice())));
	BailErr((err = SGNewChannel(seqGrab, VideoMediaType, sgChannel)));
	
	// let the user configure the video channel
	//BailErr((err = SGSettingsDialog(seqGrab, *sgChannel, 0, nil, 0, nil, 0)));    // ************************
// ************************************************************	
	
	
	BailErr((err = SGSetChannelBounds(*sgChannel, theRect)));
	// set usage for new video channel to avoid playthrough
	BailErr((err = SGSetChannelUsage(*sgChannel, seqGrabRecord ))); //note we don't set seqGrabPlayDuringRecord
    BailErr((err = SGSetDataProc(seqGrab, dataProc, refCon)));
	BailErr((err = SGStartRecord(seqGrab)));

bail:
    return err;
}

//////////
//
// DoCloseSG
// Terminate recording for our SG channel - dispose of the channel and 
// the associated SG component instance
//
//////////

void DoCloseSG(ComponentInstance seqGrab, SGChannel sgChannel, SGDataUPP dataProc)
{
	if(seqGrab) 
    {
		SGStop(seqGrab);
        SGSetDataProc(seqGrab, NULL ,NULL);
        if (dataProc)
        {
            DisposeSGDataUPP(dataProc);
        }

        SGDisposeChannel(seqGrab, sgChannel);
		CloseComponent(seqGrab);
	}
}