Mac Mania 2/MacMania 2.toast/Demo's/Tools&Utilities/Programming/QT MovieToolBox/other QT code not used yet/ConvertToMovie Jr.c

C/C++ Source or Header | 1992-10-25 | 25.3 KB | 775 lines | [TEXT/KAHL]

//    ConvertToMovie Jr. is an example application to recompress QuickTime
//    movies and is based heavily on the venerable ConvertToMovie™.  It shows
//    how to use various parts of the Movie Toolbox, Image Compression Manager,
//    and Standard Compression Component.
//
//    This code is not intended to show coding style, user interface
//    or graceful error handling.



#include <traps.h>
#include <movies.h>
#include <moviesformat.h>
#include <quicktimecomponents.h>


#define    BailNil(n)        if (!n) goto bail;
#define    BailError(n)    if (n) goto bail;

pascal short
DefaultsHookProc(DialogPtr theDialog, short itemHit, void *params, long refcon);


void main()
{
    short        frameNum;
    OSErr        result;
    short        abort;
    short        firstPass = true;

    Point        where;
    SFTypeList    typeList;
    SFReply        srcFile;
    SFReply        dstFile;
    short        movieRefNum = 0;

    ComponentInstance ci;

    Movie        srcMovie = nil;
    Rect        srcRect;
    GWorldPtr    srcGWorld = nil;
    Movie        dstMovie = nil;
    Track        dstTrack;
    Media        dstMedia;
    long        frameCount;
    TimeValue    curMovieTime;

    CWindowPtr    progressWindow = nil;

    ImageSequence    dstSeqID;

    ImageDescription **idh;
    SCTemporalSettings ts;
    SCDataRateSettings ds;

    InitGraf(&qd.thePort);
    InitFonts();
    FlushEvents(0xffff,0);
    InitWindows();
    InitMenus();
    InitDialogs(0);
    TEInit();
    InitCursor();
    MaxApplZone();


    //---------------------------------------------------------------------------------------------
    //    Check to make sure at least QuickTime 1.5 is installed.  We depend on features
    //    of the Standard Compression component that are only present in 1.5 or later.
    //---------------------------------------------------------------------------------------------

    {
        long version;

        if (GetOSTrapAddress(_GestaltDispatch) == GetToolTrapAddress(_Unimplemented))
            BailNil(0);
        result = Gestalt(gestaltQuickTime,&version);
        if (result || version < 0x01508000)
            BailNil(0);
    }


    //---------------------------------------------------------------------------------------------
    //    Initialize the Movie Toolbox.
    //    Make sure you do this.  It's very easy to forget about.
    //---------------------------------------------------------------------------------------------

    result = EnterMovies();
    BailError(result);


    //---------------------------------------------------------------------------------------------
    //    Open the Standard Compression component and adjust it to meet our needs.
    //---------------------------------------------------------------------------------------------

    ci = OpenDefaultComponent(StandardCompressionType,StandardCompressionSubType);
    BailNil(ci);

    //    Turn off best depth option in the compression dialog.
    //    Because all of our buffering is done at 32-bits, regardless
    //    of the depth of the source data, best depth isn't very useful
    //    as it will always choose 32-bit.
    //
    //    A more ambitious approach would be to loop through each of the
    //    video sample descriptions in each of the video tracks looking
    //    for the deepest depth, and using that for the best depth.
    //    Better yet, we could find out which compressors were used
    //    and set one of those as the default in the compression dialog.

    {
        long flags;

        SCGetInfo(ci,scPreferenceFlagsType,&flags);
        flags &= ~scShowBestDepth;
        SCSetInfo(ci,scPreferenceFlagsType,&flags);
    }

    //    Because we are recompressing a movie that may have a variable frame rate,
    //    we want to allow the user to leave the frame rate text field blank.  We
    //    can then preserve the frame durations of the source movie.  If they enter
    //    a number we will resample the movie at a new frame rate.  If we don't clear
    //    this flag, the compression dialog will not allow zero in the frame rate field.
    //
    //    NOTE: Setting this flag could have been done above when we cleared the
    //    scShowBestDepth flag.  It is done separately for clarity.

    {
        long flags;

        SCGetInfo(ci,scPreferenceFlagsType,&flags);
        flags |= scAllowZeroFrameRate;
        SCSetInfo(ci,scPreferenceFlagsType,&flags);
    }


    //---------------------------------------------------------------------------------------------
    //    Ask for a source movie file using Standard Preview.
    //    Use (-2,-2) to center on the best device.
    //---------------------------------------------------------------------------------------------

NextPass:
    where.h = where.v = -2;
    typeList[0] = 'MooV';
    SFGetFilePreview(where,"\p", nil,1,typeList,nil, &srcFile);
    if (!srcFile.good)
        goto bail;


    //---------------------------------------------------------------------------------------------
    //    Open up the movie file and get a movie from it.
    //---------------------------------------------------------------------------------------------

    {
        FSSpec    theFSSpec;
        short    refnum;

        //    Create an FSSpec from the reply information.

        result = FSMakeFSSpec(srcFile.vRefNum,0,srcFile.fName,&theFSSpec);
        BailError(result);

        //    Open a movie file using the FSSpec and create a movie from that file.

        result = OpenMovieFile(&theFSSpec, &refnum, 0);
        BailError(result);

        result = NewMovieFromFile(&srcMovie,refnum, nil, nil,newMovieActive, nil);
        BailError(result);

        //    We're done with the movie file.

        CloseMovieFile(refnum);
    }


    //---------------------------------------------------------------------------------------------
    //    Count the number of video "frames" in the movie by stepping through all of the
    //    video "interesting times", or in other words, the places where the movie displays
    //    a new video sample. The time between these interesting times is not necessarily constant.
    //---------------------------------------------------------------------------------------------

    {
        OSType        whichMediaType = VIDEO_TYPE;
        short        flags = nextTimeMediaSample + nextTimeEdgeOK;
        TimeValue    duration;
        TimeValue    theTime = 0;

        frameCount = -1;
        while (theTime >= 0) {
            frameCount++;
            GetMovieNextInterestingTime(srcMovie,flags,1,&whichMediaType,theTime,0,&theTime,&duration);

            //    After the first interesting time, don't include the time we are currently at.

            flags = nextTimeMediaSample;
        }
    }


    //---------------------------------------------------------------------------------------------
    //    Get the bounding rectangle of the movie, create a 32-bit gworld with those dimensions,
    //    and draw the movie poster picture into it.  This gworld will be used for the test image
    //    in the compression dialog and for rendering movie frames into.
    //---------------------------------------------------------------------------------------------

    {
        PicHandle    ph = GetMoviePosterPict(srcMovie);
        CGrafPtr    savePort;
        GDHandle    saveDevice;

        result = GetMoviesError();
        GetMovieBox(srcMovie,&srcRect);
        result = NewGWorld(&srcGWorld,32,&srcRect,nil,nil,0);
        BailError(result);
        if (ph) {
            GetGWorld(&savePort,&saveDevice);
            SetGWorld(srcGWorld,nil);
            EraseRect(&srcRect);
            DrawPicture(ph,&srcRect);
            KillPicture(ph);
            SetGWorld(savePort,saveDevice);

            //    Use the gworld image of the movie poster frame as a compression dialog test image.
            //    Pass nil for srcRect to use the entire image, and pass zero to use the default display method.

            result = SCSetTestImagePixMap(ci,srcGWorld->portPixMap,nil,0);
            BailError(result);
        }
    }

    //---------------------------------------------------------------------------------------------
    //    Set compression dialog extend procs for the "Defaults" button.
    //    We wait until now so we can pass the srcGWorld pixmap in as a refcon.
    //---------------------------------------------------------------------------------------------

    {
        SCExtendedProcs xprocs;

        //    Because the compression dialog is movable modal, a filter proc
        //    to handle update events for application windows is required.
        //    Since our example application is completely modal, and we have
        //    no other windows to update, we don't have a filter proc.

        xprocs.filterProc = nil;

        //    Proc to handle custom button click.

        xprocs.hookProc = DefaultsHookProc;

        //    Any information useful to the extended procs can be put
        //    in the refcon.  For an application that has globals, a refcon
        //    of the current A5 is handy for getting at those globals in
        //    the extended procs.  In our case, we put the srcGWorld pixmap
        //    in the refcon so we can set defaults on it in our hook proc.

        xprocs.refcon = (long)srcGWorld->portPixMap;

        //    Set the custom button name.

        BlockMove("\pDefaults",xprocs.customName,9);

        //    Tell the compression dialog about the extended procs.

        SCSetInfo(ci,scExtendedProcsType,&xprocs);
    }


    //---------------------------------------------------------------------------------------------
    //    Set up some default settings for the compression dialog if needed, and ask
    //    for compression settings from the user.
    //---------------------------------------------------------------------------------------------

    if (firstPass) {
        result = SCDefaultPixMapSettings(ci,srcGWorld->portPixMap,true);
        BailError(result);
    }

    result = SCGetInfo(ci,scTemporalSettingsType,&ts);
    BailError(result);

    //    The first time through, clear out the default frame rate chosen by Standard Compression.
    //    We know that a frame rate of 0 means use the rate of the source movie.  It probably should
    //    have been smart enough to figure that out because we set the scAllowZeroFrameRate flag.
    //    Oh well.

    if (firstPass) {
        ts.frameRate = 0;
        SCSetInfo(ci,scTemporalSettingsType,&ts);
    }

    //    Get compression settings from the user.  The first time through this loop,
    //    we choose default compression settings for the test image we set above.
    //    On subsequent passes, the settings previously chosen by the user will be the defaults.

    result = SCRequestSequenceSettings(ci);
    if (result == scUserCancelled) {
        // deal with user cancelling.
    }
    BailError(result);

    //    Get a copy of the temporal settings the user entered.  We'll need them for
    //    some of our calculations.  In a simpler application we'd never have to look at them.

    result = SCGetInfo(ci,scTemporalSettingsType,&ts);
    BailError(result);


    //---------------------------------------------------------------------------------------------
    //    Take the overall data rate value entered by the user and subtract out the
    //    part of the data rate allocated to sound.  We do this by looking at all of the
    //    sound tracks in the source movie and using the one with the highest sample rate.
    //    This number is then subtracted from the data rate leaving the amount of data per
    //    second available to the compressed video data.  This is obviously only an approximation
    //    because the various sound tracks may or may not overlap, be stereo, be compressed, etc.
    //    A more accurate approximation would be almost mandatory for a real QuickTime movie
    //    creating/editing application.
    //---------------------------------------------------------------------------------------------

    if (!SCGetInfo(ci,scDataRateSettingsType,&ds)) {
        if (ds.dataRate) {
            short    i;
            short    trackCount = GetMovieTrackCount(srcMovie);
            long    maxSoundRate = 0;
            for (i = 1; i <= trackCount; i++) {
                OSType    trackType;
                Track    strack = GetMovieIndTrack(srcMovie,i);
                Media    smedia = GetTrackMedia(strack);
                BailError(GetMoviesError());
                GetMediaHandlerDescription(smedia,&trackType,0,0);
                if (trackType == SOUND_TYPE) {
                    long rate;
                    SampleDescriptionHandle desc = (SampleDescriptionHandle)NewHandle(sizeof(SampleDescription));
                    GetMediaSampleDescription(smedia,1,desc);
                    if (GetMoviesError()) {
                        DisposeHandle((Handle)desc);
                        continue;
                    }
                    rate = (*(SoundDescriptionHandle)desc)->sampleRate >> 16;
                    if (rate > maxSoundRate)
                        maxSoundRate = rate;
                }
            }
            ds.dataRate -= maxSoundRate;
        }
        SCSetInfo(ci,scDataRateSettingsType,&ds);
    }


    //---------------------------------------------------------------------------------------------
    //    If the user said they want to resample the frame rate of the movie,
    //    (by entering a non-zero value in the frame rate field) calculate
    //    the number of frames and duration for the new movie.
    //---------------------------------------------------------------------------------------------

    if (ts.frameRate) {
        long    dur = GetMovieDuration(srcMovie);
        long    timescale = GetMovieTimeScale(srcMovie);
        float    f = (float)dur * ts.frameRate;
        frameCount = f / timescale / 65536;
        if (frameCount == 0)
            frameCount = 1;
    }


    //---------------------------------------------------------------------------------------------
    //    Ask the user for the name of the new movie file.
    //    We'll be lazy here and just use "Untitled".  A real app would
    //    base it on the name of the source movie and check if the user
    //    tried to enter a name the same as the source movie.
    //
    //    Note we use the SCPositionDialog call to get a good position
    //    point for the SFPutFile.  -3999 is the resource I.D. for
    //    SFPutFile dialog.
    //---------------------------------------------------------------------------------------------

    where.h = where.v = -2;
    SCPositionDialog(ci,-3999,&where);
    SFPutFile(where,"\pSave new movie file as:","\pUntitled",nil,&dstFile);
    if (!dstFile.good)
        goto bail;            // deal with user cancelling


    //---------------------------------------------------------------------------------------------
    //    Open a progress window to frames as they are compressed.  Use Standard
    //    Compression utility routines to position the window.
    //---------------------------------------------------------------------------------------------

    {
        Rect r = srcRect;
        where.h = where.v = -2;
        result = SCPositionRect(ci,&r,&where);
        progressWindow = (CWindowPtr)NewCWindow(0,&r,dstFile.fName,true,0,(WindowPtr)-1,false,0);
    }


    //---------------------------------------------------------------------------------------------
    //    Create the new movie file and prepare it for edits.
    //---------------------------------------------------------------------------------------------

    {
        FSSpec            theFSSpec;
        MatrixRecord    matrix;

        //    Create an FSSpec for the destination movie.

        result = FSMakeFSSpec(dstFile.vRefNum,0,dstFile.fName,&theFSSpec);
        if (result != fnfErr)        // ignore a file not found error
            BailError(result);

        //    Using the FSSpec create a movie file for the destination movie.

        result = CreateMovieFile(&theFSSpec,'TVOD',0,createMovieFileDeleteCurFile,&movieRefNum,&dstMovie);
        BailError(result);

        //    Create a new video movie track with the same dimensions as the entire source movie.

        dstTrack = NewMovieTrack(dstMovie,
                (long)(srcRect.right - srcRect.left) << 16,
                (long)(srcRect.bottom - srcRect.top) << 16,0);

        //    Create a media for the new track with the same time scale as the
        //    source movie.  Because the time scales are the same, we don't have
        //    to do any time scale conversions.

        dstMedia = NewTrackMedia(dstTrack,VIDEO_TYPE,GetMovieTimeScale(srcMovie),0,0);
        BailError(GetMoviesError());

        //    Copy the user data and settings from the source to the dest movie.
        //    These settings include information like user data.

        CopyMovieSettings(srcMovie,dstMovie);

        //    Set movie matrix to identity and clear the movie clip region
        //    because conversion process transforms and composites all video
        //    tracks into one untransformed video track.

        SetIdentityMatrix(&matrix);
        SetMovieMatrix(dstMovie,&matrix);
        SetMovieClipRgn(dstMovie,nil);

        //    Prepare for adding frames to the movie.
        //    Make sure you do this.  It's very easy to forget about.

        result = BeginMediaEdits(dstMedia);
        BailError(result);
    }


    //---------------------------------------------------------------------------------------------
    //    Start a compression sequence using the parameters chosen by the user.
    //    Pass nil for the source rect to use the entire image.  An image description
    //    handle will be returned in idh.  Nil could be passed for that if we
    //    didn't need it for our progress window display.  We do not have dispose
    //    the image description handle.  It is disposed for use by SCCompressSequenceEnd.
    //---------------------------------------------------------------------------------------------

    result = SCCompressSequenceBegin(ci,srcGWorld->portPixMap,nil,&idh);
    BailError(result);

    //    Clear out our image gworld and set movie to draw into it.

    SetGWorld(srcGWorld,nil);
    EraseRect(&srcGWorld->portRect);
    SetMovieGWorld(srcMovie,srcGWorld,GetGWorldDevice(srcGWorld));

    //    Set current time value to begining of movie.

    curMovieTime = 0;

    //    Loop through all of the interesting times we counted above.

    for (frameNum = 0; frameNum < frameCount; frameNum++) {

        short            syncFlag;
        TimeValue        duration;
        long            flags;
        long            dataSize;
        Handle            compressedData;

        //    Abort if the user clicked the mouse or pressed a key.

        {
            EventRecord event;
            abort = false;
            if (EventAvail(keyDownMask | mDownMask,&event)) {
                abort = true;
                break;
            }
        }

        //    Get the next frame of the source movie.

        {
            //    If we are resampling the movie, step to the next frame.

            if (ts.frameRate) {

                //    This code could be much smarter about its calculations.
                //    The srcMovie duration and dstMovie frame duration are both
                //    constant and could be calculated once outside this loop

                long dur = GetMovieDuration(srcMovie);
                curMovieTime = frameNum*dur/(frameCount-1);
                duration = dur / frameCount;
            } else {
                short flags = nextTimeMediaSample;
                OSType    whichMediaType = VIDEO_TYPE;

                //    If this is the first frame, include the frame we are currently on.

                if (frameNum == 0)
                    flags |= nextTimeEdgeOK;

                //    If we are maintaining the frame durations of the source movie,
                //    skip to the next interesting time and get the duration for that frame.

                GetMovieNextInterestingTime(srcMovie,flags,1,&whichMediaType,curMovieTime,0,&curMovieTime,&duration);
            }
            SetMovieTimeValue(srcMovie,curMovieTime);
            MoviesTask(srcMovie,0);
            MoviesTask(srcMovie,0);
            MoviesTask(srcMovie,0);
        }

        //    If data rate constraining is being done, tell Standard Compression the
        //    duration of the current frame in milliseconds.  We only need to do this
        //    if the frames have variable durations.

        {
            SCDataRateSettings ds;
            if (!SCGetInfo(ci,scDataRateSettingsType,&ds)) {
                ds.frameDuration = duration * 1000 / GetMovieTimeScale(srcMovie);
                SCSetInfo(ci,scDataRateSettingsType,&ds);
            }
        }

        //    Compress the frame.  compressedData will hold a handle to the newly compressed
        //    image data.  dataSize is the size of the compressed data, which will usually be
        //    different than the size of the compressedData handle.  syncFlag is a value that
        //    can be passed directly to AddMediaSample which indicates whether or not the frame
        //    is a key frame.  Note that we do not have to dispose of the compressedData handle.
        //    It will be dispose for us when we call SCCompressSequenceEnd.

        result = SCCompressSequenceFrame(ci,srcGWorld->portPixMap,&srcRect,&compressedData,&dataSize,&syncFlag);
        BailError(result);

        //    Append the compressed image data to the media.

        result = AddMediaSample(dstMedia,compressedData,0,dataSize,duration,
                (SampleDescriptionHandle)idh,1,syncFlag,nil);
        BailError(result);

        //    Decompress the compressed frame into the progress window.

        if (progressWindow) {
            CodecFlags    outFlags;
            char hstate;

            //    Set port to progress window.

            SetGWorld(progressWindow,nil);

            //    If this is the first frame, start up a decompression sequence.

            if (frameNum == 0) {
                result = DecompressSequenceBegin(&dstSeqID,idh,nil,nil,&srcRect,nil,ditherCopy,
                    nil,0,codecNormalQuality,anyCodec);
                BailError(result);
            }

            //    Save the locked state of the compressed data and then lock it.
            //    We want it locked but standard compression may or may not.

            hstate = HGetState(compressedData);
            HLock(compressedData);

            //    Decompress the frame to the progress window.  Note that we StripAddress
            //    the compressedData pointer because it must be 32-bit clean.

            result = DecompressSequenceFrame(dstSeqID,StripAddress(*compressedData),0,nil,nil);

            //    Restore the locked state of the data handle.

            HSetState(compressedData,hstate);
            BailError(result);
        }
    }

    //    Close the compression sequence.  This will dispose of the image description
    //    and compressed data handles allocated by SCCompressSequenceBegin.

    SCCompressSequenceEnd(ci);

    //    Close the decompression sequence.  Note that this is an Image Compression
    //    Manager call, not Standard Compression.

    CDSequenceEnd(dstSeqID);


    //    Copy all sound tracks from the source to dest movie.
    //
    //    NOTE: We are not copying any other track types here.  That means
    //    text tracks, alternate tracks, etc. are not being copied.  A real
    //    application would give the user some options here.

    {
        short    i;
        short    trackCount;

        //    Get a count of all the tracks present in the source movie.

        trackCount = GetMovieTrackCount(srcMovie);

        //    Loop through each of the tracks, looking for sound tracks.

        for (i = 1; i <= trackCount; i++) {
            OSType    trackType;
            Track    strack;
            Media    smedia;

            //    Get the next track and its media.

            strack = GetMovieIndTrack(srcMovie,i);
            smedia = GetTrackMedia(strack);
            BailError(GetMoviesError());

            //    Find out what type of media this track has.
            //    We only care about sound.

            GetMediaHandlerDescription(smedia,&trackType,0,0);
            if (trackType == SOUND_TYPE) {
                Track    dtrack;
                Media    dmedia;

                //    Create a new sound track in the destination movie.

                dtrack = NewMovieTrack(dstMovie,0,0,GetTrackVolume(strack));
                BailError(GetMoviesError());

                //    Create a media for that sound track and prepare it for editing.

                dmedia = NewTrackMedia(dtrack,SOUND_TYPE,GetMediaTimeScale(smedia),0,0);
                BailError(GetMoviesError());

                result = BeginMediaEdits(dmedia);
                BailError(GetMoviesError());

                //    Insert the new track into the dest movie starting at time
                //    zero and lasting for the entire duration of the movie.

                InsertTrackSegment(strack,dtrack,0,GetTrackDuration(strack),0);
                BailError(GetMoviesError());

                //    We're done editing the media.

                EndMediaEdits(dmedia);
            }
        }
    }

    //---------------------------------------------------------------------------------------------
    //    Now that we're finished compressing video data, make that data part of our movie.
    //---------------------------------------------------------------------------------------------

    if (dstTrack) {
        short resID = 128;

        //    End changes to the media.

        result = EndMediaEdits(dstMedia);
        BailError(result);

        //    Insert the newly created media into the newly created track at
        //    the begining of the track and lasting for the entire duration of
        //    the media.  The media rate is 1.0 for normal playback rate.

        InsertMediaIntoTrack(dstTrack,0,0,GetMediaDuration(dstMedia),kFix1);

        //    Add the movie resource to the dst movie file.

        result = AddMovieResource(dstMovie,movieRefNum,&resID,"\pMovie 1");
        BailError(result);

        //---------------------------------------------------------------------------------------------
        //    Next we flatten the movie.  The movie file we just created has all of
        //    the video data at the beginning and all of the sound data at the end.
        //    This unnatural situation may cause the movie to play poorly.  By flattening
        //    the movie, we are reinterleaving all of the tracks in a way optimal for playback.
        //    Because we cannot flatten a movie in place, we create a temp file, flatten to
        //    that file and if successful, delete the first file and rename the temp file to
        //    be the real file.  For large files this takes some time.
        //
        //    Once again, a real application would choose a temp file name that doesn't
        //    possibly conflict with other file names, as well as delete the temp file
        //    if the flatten fails.
        //---------------------------------------------------------------------------------------------

        {
            FSSpec    theFSSpec;
            short    resID = 128;
            dstFile.fName[++dstFile.fName[0]] = '@';
            result = FSMakeFSSpec(dstFile.vRefNum,0,dstFile.fName,&theFSSpec);
            if (result != fnfErr)
                BailError(result);
            FlattenMovie(dstMovie,0,&theFSSpec,'TVOD',-1,createMovieFileDeleteCurFile,&resID,"\p");
            result = GetMoviesError();
            CloseMovieFile(movieRefNum);
            DisposeMovie(dstMovie);
            dstTrack = nil;
            if (!result) {
                Str255 tempStr;
                BlockMove(dstFile.fName,tempStr,256);
                tempStr[0]--;
                result = FSDelete(tempStr,dstFile.vRefNum);
                result = Rename(dstFile.fName,dstFile.vRefNum,tempStr);
            }
        }
    }

    //    Throw away the progress window.

    if (progressWindow) {
        CloseWindow(progressWindow);
        progressWindow = nil;
    }

    //    Throw away the movie buffer gworld.

    if (srcGWorld) {
        DisposeGWorld(srcGWorld);
        srcGWorld = nil;

        //    Just to be overly safe, we clear our the test image
        //    because we just disposed the pixmap it depends on.

        SCSetTestImagePixMap(ci,nil,nil,0);
    }

    if (!abort) {
        firstPass = false;
        goto NextPass;
    }

    //    Close the Standard Compression component.

    CloseComponent(ci);
bail:;
}


//    Handle clicks in the "Defaults" custom button.

pascal short
DefaultsHookProc(DialogPtr theDialog, short itemHit, void *params, long refcon)
{
    if (itemHit == scCustomItem) {
        SCTemporalSettings ts;

        //    Set defaults for our test image (passed in refcon).

        SCDefaultPixMapSettings(params,(PixMapHandle)refcon,true);

        //    Once again, don't use the default frame rate chosen
        //    by Standard Compression.  Clear it out to zero.

        SCGetInfo(params,scTemporalSettingsType,&ts);
        ts.frameRate = 0;
        SCSetInfo(params,scTemporalSettingsType,&ts);
    }
    return (itemHit);
}