/*

File: QTUtils.m

Abstract: Utility functions for QTMovies

Version: <1.0>

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*/ 

#import "QTUtils.h"

@implementation QTUtils

//

// appendMovies

//

// given an array of movies, append them together in sequence

// to create a new movie file at the specified path

//

// Inputs

//      inMoviesArray - an array of QTMovie objects

//      filePath - destination file path for flattened movie

//

// Outputs

//      a new movie containing all the movies in the array

//      appended in sequence.

//

+ (QTMovie *)appendMovies:(NSArray *)inMoviesArray destFilePath:(NSString *)filePath

{

    QTMovie         *outMovie = NULL; 

    NSDictionary    *dict = nil;

    NSNumber        *isEditable = nil;

    BOOL            success = NO;

    NSEnumerator    *movieObjEnumerator1 = nil, *movieObjEnumerator2 = nil;

    NSSize          savedMovieSizes = {0,0};

    if (!inMoviesArray)

        goto bail;

    if (!filePath) 

        goto bail;

    // create our destination movie which we'll use to

    // write all our movie clips

    outMovie = [QTMovie movie];

    if (!outMovie)

        goto bail;

    // in order to add segments to our newly created movie

    // we must make sure the "QTMovieEditableAttribute" 

    // attribute is set

    isEditable = [NSNumber numberWithBool:YES];

    [outMovie setAttribute:isEditable forKey:QTMovieEditableAttribute];

    movieObjEnumerator1 = [inMoviesArray objectEnumerator];

    QTMovie *aQTMovie;

    // first we'll iterate over every movie clip to find the

    // one with the biggest natural size -- we'll then use

    // this size for our new movie

    while (aQTMovie = [movieObjEnumerator1 nextObject]) 

    {

        NSValue *naturalSize = [aQTMovie attributeForKey:QTMovieNaturalSizeAttribute];

        NSSize theSize = [naturalSize sizeValue];

        // save the biggest dimensions we find 

        // for height/width to use for our destination

        // movie

        if (theSize.width > savedMovieSizes.width)

        {

            savedMovieSizes.width = theSize.width;

        }

        if (theSize.height > savedMovieSizes.height)

        {

            savedMovieSizes.height = theSize.height;

        }

    }

    // we'll use the biggest height/width values found for

    // our destination movie

    [outMovie setAttribute:[NSValue valueWithSize:savedMovieSizes] forKey:QTMovieNaturalSizeAttribute];

    // now iterate each clip and add it to our destination

    // movie

    movieObjEnumerator2 = [inMoviesArray objectEnumerator];

    while (aQTMovie = [movieObjEnumerator2 nextObject]) 

    {

        NSNumber *timeScale = [aQTMovie attributeForKey:QTMovieTimeScaleAttribute];

        // make a QTTime corresponding to time 0 for our movie

        QTTime timeZero = QTMakeTime(0,[timeScale longValue]);

        // make a QTTimeRange for the entire source movie 

        // (time 0 to movie end)

        QTTimeRange timeRange = QTMakeTimeRange(timeZero, [aQTMovie duration]);

        // insert all src movie tracks from this clip into 

        // our destination movie - specify a time range of

        // the entire src. movie clip

        [outMovie insertSegmentOfMovie:aQTMovie timeRange:timeRange 

                atTime:[outMovie duration]];

    }

    // create a dict. with the movie flatten attribute (QTMovieFlatten)

    // which we'll use to flatten the movie to a file below

    dict = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] 

                forKey:QTMovieFlatten];

    if (dict)

    {

        // create a new movie file and flatten the movie to the file

        // passing the QTMovieFlatten attribute here means the movie

        // will be flattened

        success = [outMovie writeToFile:filePath withAttributes:dict];

    }

bail:

    return outMovie;

}

@end