/*

    File:       QuickTimeUtils.c

    Description: Misc. QuickTime Utilities

    Author:     Apple DTS

    Copyright:  © Copyright 2005 Apple Computer, Inc. All rights reserved.

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                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

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    Change History (most recent first):

*/

#include "QuickTimeUtils.h"

//////////

//

// GetMovieFromCFURLRef

// Instantiate a QuickTime movie for a QuickTime movie file CFURL.

// 

//////////

OSErr GetMovieFromCFURLRef(CFURLRef *inURLRef, Movie *outMovieRef)

{

    Handle outDataRef;

    OSType outDataRefType;

    // first create a QuickTime data reference for our CFURL

    OSErr err = QTNewDataReferenceFromCFURL(*inURLRef,

                                            0,

                                            &outDataRef,

                                            &outDataRefType);

    require(err == noErr, bail);

    DataReferenceRecord dataRefRecord;

    Boolean     active = true;

    dataRefRecord.dataRefType = outDataRefType;

    dataRefRecord.dataRef = outDataRef;

    QTNewMoviePropertyElement newMovieProperties[] = 

    {  

        {kQTPropertyClass_DataLocation, kQTDataLocationPropertyID_DataReference, sizeof(dataRefRecord), &dataRefRecord, 0},

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

    };

    // instantiate a QuickTime movie from our CFURL data reference

    err = NewMovieFromProperties(sizeof(newMovieProperties) / sizeof(newMovieProperties[0]), newMovieProperties, 0, nil, outMovieRef);

    DisposeHandle(outDataRef);

bail:

    return err;

}

//////////

//

// InitializeQuickTime

// Initializes the Movie Toolbox.

// 

//////////

OSErr InitializeQuickTime()

{

    return (EnterMovies());

}

//////////

//

// MovieHasSoundTrack

// Determine whether a movie contains a sound track.

// 

//////////

Boolean MovieHasSoundTrack (Movie theMovie)

{

    return(GetMovieIndTrackType(theMovie, 1, AudioMediaCharacteristic, movieTrackCharacteristic | movieTrackEnabledOnly) != NULL);

}

//////////

//

// GetMovieExtractionDuration

//

// Determine the movie audio extraction duration which is

// the duration of the longest sound track in the movie.

//

// Note this is different than the movie duration, which is

// the duration of the entire movie irrespective of how long 

// any sound tracks in the movie may be. For example, a given

// sound track in the movie may only have a duration equal to 

// half the length of the actual movie. In this case, we would

// want to stop audio extraction at the end of the sound track

// duration, not at the end of the movie duration

// 

//////////

Float64 GetMovieExtractionDuration (Movie theMovie)

{

    TimeValue maxDuration = 0;

    UInt8 i;

    SInt32 trackCount = GetMovieTrackCount(theMovie);

    if (trackCount) 

    {

        for (i = 1; i < trackCount + 1; i++) 

        {

            Track aTrack = GetMovieIndTrackType(theMovie,

                                                i,

                                                SoundMediaType,

                                                movieTrackMediaType);

            if (aTrack) 

            {

                TimeValue aDuration = GetTrackDuration(aTrack);

                if (aDuration > maxDuration) maxDuration = aDuration;

            }

        }

        return ((Float64)maxDuration / (Float64)GetMovieTimeScale(theMovie));

    }

}