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Retired Document

Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.

main.c

/*

    File:       main

    Description: Carbon Event Shell for Movie Audio Extraction sample code

    Author:     Apple DTS

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

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

                ("Apple") in consideration of your agreement to the following terms, and your

                use, installation, modification or redistribution of this Apple software

                constitutes acceptance of these terms.  If you do not agree with these terms,

                please do not use, install, modify or redistribute this Apple software.

                In consideration of your agreement to abide by the following terms, and subject

                to these terms, Apple grants you a personal, non-exclusive license, under Apple’s

                copyrights in this original Apple software (the "Apple Software"), to use,

                reproduce, modify and redistribute the Apple Software, with or without

                modifications, in source and/or binary forms; provided that if you redistribute

                the Apple Software in its entirety and without modifications, you must retain

                this notice and the following text and disclaimers in all such redistributions of

                the Apple Software.  Neither the name, trademarks, service marks or logos of

                Apple Computer, Inc. may be used to endorse or promote products derived from the

                Apple Software without specific prior written permission from Apple.  Except as

                expressly stated in this notice, no other rights or licenses, express or implied,

                are granted by Apple herein, including but not limited to any patent rights that

                may be infringed by your derivative works or by other works in which the Apple

                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

                COMBINATION WITH YOUR PRODUCTS.

                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

                CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

                GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

                ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION

                OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT

                (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN

                ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    Change History (most recent first):

*/

#include <Carbon/Carbon.h>

#include <QuickTime/QuickTime.h>

#include <CoreAudio/CoreAudio.h>

#include <AudioUnit/AudioUnit.h>

#include <unistd.h>

#include "ExtractAndPlay.h"

static EventHandlerUPP  mWinEventHandler;           // window event handler

static ControlRef       mButtonRef, mMovNameRef;

static WindowRef        mWindow;

static CFURLRef         mMovieFileURLref = nil;

static Movie            mCurrentMovie = NULL;

static void GetMovieFileFromUser();

static void HandleWindowUpdate(WindowRef window);

static pascal OSErr HandleAppleEventOdoc( const AppleEvent *theAppleEvent, AppleEvent *reply, long handlerRefcon );

static void InstallAppleEventHandlers( void );

static pascal OSStatus CommandProcessEventHandler( EventHandlerCallRef nextHandler, EventRef inEvent, void *userData );

static pascal OSStatus WindowEventHandler(EventHandlerCallRef myHandler, EventRef event, void* userData);

static OSStatus SetControlTextToMovieName();

static OSStatus SetControlButtonTextStopped();

static OSStatus SetControlButtonTextPlay();

// custom events for updating our UI (button)

enum {

    kEventClassMovieExtractState    = 'DONE',

    kEventKQueue                    = 'KQEv',

    typeKEvent                      = 'KEvt'

};

// play button

enum

    kPlayBtn    = 'play'

};

const ControlID kPlayBtnID = { kPlayBtn, 0 };

// movie name static text control

enum

    kMovNameTxt = 'mnam'

};

const ControlID kMovNameTxtID = { kMovNameTxt, 0 };

CFStringRef playText = CFSTR("Play");

CFStringRef stopText = CFSTR("Stop");

#pragma mark - Nav Services Routines -

/* GetCFURLFromNavReply returns a URL referencing a file that

is yet to be created in response to a

NavCreatePutFileDialog/NavDialogRun sequence */

CFURLRef GetCFURLFromNavReply(const NavReplyRecord * navReply)

    OSStatus err;

    FSRef parentFSRef;

    CFURLRef parentURLRef = NULL;

    AEKeyword theAEKeyword;

    DescType typeCode;

    Size actualSize;

        /* ensure locals are in a known state */

    parentURLRef = NULL;

        /* get the FSRef referring to the parent directory */

    err = AEGetNthPtr(&navReply->selection, 1, typeFSRef,

        &theAEKeyword, &typeCode, &parentFSRef, sizeof(FSRef), &actualSize);

    if (err == noErr)

            /* convert the FSRef into a Core Foundation URL */

        parentURLRef = CFURLCreateFromFSRef(NULL, &parentFSRef);

        /* return the reference to the new URL */

    return parentURLRef;

// get a CFURLRef for a movie file

static  OSStatus GetMovieFileURL( CFURLRef *urlRef )

    OSStatus status;

    NavDialogCreationOptions myDialogOptions;

    status = NavGetDefaultDialogCreationOptions (&myDialogOptions);

    NavDialogRef myDialogRef;

    status = NavCreateGetFileDialog (&myDialogOptions,

                                    NULL,

                                    NULL,

                                    NULL,

                                    NULL,

                                    NULL,

                                    &myDialogRef);

    status = NavDialogRun (myDialogRef);

    NavReplyRecord reply;

    status = NavDialogGetReply(myDialogRef, &reply);

    if ( reply.validRecord ) // User saved

        *urlRef = GetCFURLFromNavReply(&reply);

    else  // User cancelled

        status = userCanceledErr;

    return( status );

#pragma mark -

#pragma mark - Open Document -

static  OSStatus    OpenDocuments( AEDescList docList )

    long                index;

    FSRef               fsRef;

    long                count           = 0;

    OSStatus            status          = AECountItems( &docList, &count );

    require_noerr( status, CantGetCount );

    for( index = 1; index <= count; index++ )

        if ( (status = AEGetNthPtr( &docList, index, typeFSRef, NULL, NULL, &fsRef, sizeof(FSRef), NULL) ) == noErr )

                /* convert the FSRef into a Core Foundation URL */

            CFURLRef parentURLRef = CFURLCreateFromFSRef(NULL, &fsRef);

            if (NULL != parentURLRef)

                GetMovieFromCFURLRef(&parentURLRef, &mCurrentMovie);

CantGetName:

CantCreateWindow:

CantGetCount:

    return( status );

#pragma mark -

#pragma mark - AppleEvent Handlers -

static  pascal  OSErr   HandleAppleEventOdoc( const AppleEvent *theAppleEvent, AppleEvent *reply, long handlerRefcon )

    AEDescList      docList;

    OSErr           err = AEGetParamDesc( theAppleEvent, keyDirectObject, typeAEList, &docList );

    require_noerr( err, CantGetDocList );

    err = OpenDocuments( docList );

    AEDisposeDesc( &docList );

CantGetDocList:

    return( err );

static  void    InstallAppleEventHandlers( void )

    OSErr       status;

    status  = AEInstallEventHandler( kCoreEventClass, kAEOpenDocuments, NewAEEventHandlerUPP(HandleAppleEventOdoc), 0, false );     require_noerr( status, CantInstallAppleEventHandler );

    //  Note: Since RunApplicationEventLoop installs a Quit AE Handler, there is no need to do it here.

CantInstallAppleEventHandler:

    return;

#pragma mark -

#pragma mark - CarbonEvent Handlers -

static  pascal  OSStatus CommandProcessEventHandler( EventHandlerCallRef nextHandler, EventRef inEvent, void *userData )

    HICommand   command;

    OSStatus    status   = eventNotHandledErr;

    GetEventParameter( inEvent, kEventParamDirectObject, typeHICommand, NULL, sizeof(HICommand), NULL, &command );

    switch ( command.commandID )

        case kHICommandNew:

            break;

        case kHICommandOpen:

            GetMovieFileFromUser();

            status  = noErr;    // indicate we handled the event

            break;

        case kHICommandPreferences:

            break;

        case kHICommandRevert:          //  Place holders, not handled yet

        case kHICommandPageSetup:

        case kHICommandPrint:

            break;

    return( status );

static pascal OSStatus WindowEventHandler(EventHandlerCallRef myHandler, EventRef event, void* userData)

#pragma unused (myHandler, userData)

    WindowRef       window;

    Rect            bounds;

    OSStatus        result = eventNotHandledErr;

    UInt32          eventClass = GetEventClass( event );

    UInt32          eventKind = GetEventKind( event );

    HICommand       hiCommand;

    Boolean         extractionPaused;

    switch(eventClass)

        // Our custom event which is sent by our Core Audio render procedure

        // to indicate the movie audio extraction state:

        //     state = paused or

        //    state = in progress

        // for the current movie. We update our button

        // title ("Play" or "Stop") to reflect the audio extraction state.

        case kEventClassMovieExtractState:

            if ( eventKind == kEventKQueue )

                GetEventParameter( event, kEventParamDirectObject, typeKEvent, NULL, sizeof(Boolean), NULL, &extractionPaused );

                if (extractionPaused)

                    SetControlButtonTextPlay();

                else

                    SetControlButtonTextStopped();

            break;

        case kEventClassCommand:

            if ( eventKind == kEventCommandProcess )

                GetEventParameter( event, kEventParamDirectObject, typeHICommand, NULL, sizeof(HICommand), NULL, &hiCommand );

                // Custom command ('PLAY') for our Play button selection

//

                // We get this when the user has selected the button to either

                // play/stop the audio extraction for the current movie.

//

                if ( hiCommand.commandID == 'PLAY' )

                    CFStringRef btnTitleString;

                    OSStatus status = CopyControlTitleAsCFString(mButtonRef, &btnTitleString);

                    if (status == noErr)

                        CFComparisonResult compareResult = CFStringCompare (btnTitleString,

                                                                                                                                       playText,

0);

                        if (compareResult == kCFCompareEqualTo)

                            // Play mode -- start audio extraction & playback

                            // Optionally you can pass a specific time value

                            // for the start time.

//

                            // Here's how you would setup a TimeRecord for this:

/*

                            TimeRecord timeRec;

                            timeRec.scale   = GetMovieTimeScale(mCurrentMovie);

                            timeRec.base    = NULL;

                            timeRec.value.hi = 0;

                            timeRec.value.lo = 60 * timeRec.scale; // for instance, to start at time 1:00.00

*/

                            // Optionally you can specify an audio effect be added

                            // to playback

                            DoStartMoviePreview(mCurrentMovie,

                                                nil,        /* start time - 0 means start at beginning*/

                                                true);  /* true = use audio effect during playback */

                        else

                            // Stop mode -- stop audio extraction & playback

                            DoStopMoviePreview();

            break;

        case kEventClassWindow:

            GetEventParameter(event, kEventParamDirectObject, typeWindowRef, NULL, sizeof(window), NULL, &window);

            if (eventKind == kEventWindowDrawContent)

                HandleWindowUpdate(window);

                result = noErr;

            else if (eventKind == kEventWindowBoundsChanged)

                InvalWindowRect(window, GetWindowPortBounds(window, &bounds));

                result = noErr;

            else if (eventKind == kEventWindowClose)

                // quit application

                QuitApplicationEventLoop();

                result = noErr;

            break;

    return result;

#pragma mark -

#pragma mark - Control Manipulation -

//

// set our static text control to be the name of the movie

//

static OSStatus SetControlTextToMovieName()

    CFStringRef stringRef = CFURLCopyLastPathComponent (mMovieFileURLref);

    CFIndex size = CFStringGetLength (stringRef);

    CFRange range = CFRangeMake(0, size);

    UniChar *buffer = (UniChar *)malloc(range.length  * sizeof(UniChar));

    if (buffer)

        CFStringGetCharacters(stringRef, range, buffer);

        SetControlData (mMovNameRef, kControlNoPart, kControlStaticTextTextTag, size * 2, buffer);

        free((void *)buffer);

        CFRelease(stringRef);

// Update our UI to display the "stop" button text

static OSStatus SetControlButtonTextStopped()

    return(SetControlTitleWithCFString(mButtonRef,stopText));

// Update our UI to display the "play" button text

static OSStatus SetControlButtonTextPlay()

    return(SetControlTitleWithCFString(mButtonRef,playText));

#pragma mark -

#pragma mark - Event Stuff -

static void HandleWindowUpdate(WindowRef window)

    SetPortWindowPort(window);

    // your update code here

//

// Build a custom event to send to our window handler when movie audio extraction

// completes for the current movie (without the user pressing the "Stop" button

// to stop it before it runs to the end). We'll then update our button title to

// reflect this.

//

OSStatus SendExtractionStatusEventToWindow(Boolean extractionPaused)

    OSStatus    err     = noErr;

    EventRef    event   = NULL;

    err = CreateEvent( NULL,  kEventClassMovieExtractState, kEventKQueue, GetCurrentEventTime(), kEventAttributeNone, &event );

    if ( err != noErr ) goto Bail;

    err = SetEventParameter( event, kEventParamDirectObject, typeKEvent, sizeof(Boolean), &extractionPaused );  //  Send the event

    if ( err != noErr ) goto Bail;

    err = SendEventToEventTarget (event, GetWindowEventTarget(mWindow));    // Post the event for our window handler

Bail:

    if ( event != NULL )    (void) ReleaseEvent( event );

    return( err );

void MakeWindow(IBNibRef    nibRef)

    WindowRef   window;

    OSStatus        err;

    EventHandlerRef ref;

    EventTypeSpec   winEvents[] = { { kEventClassCommand, kEventCommandProcess },

                                                { kEventClassWindow, kEventWindowClose },

                                                { kEventClassWindow, kEventWindowDrawContent },

                                                { kEventClassWindow, kEventWindowBoundsChanged },

                                                { kEventClassMovieExtractState, kEventKQueue } };

    err = CreateWindowFromNib(nibRef, CFSTR("Window"), &window);

    mWindow = window;

    mWinEventHandler = NewEventHandlerUPP(WindowEventHandler);

    err = InstallWindowEventHandler(window, mWinEventHandler, GetEventTypeCount( winEvents ), winEvents, 0, &ref);

    ControlRef control;

    err = GetControlByID( window, &kPlayBtnID, &control );

    mButtonRef = control;

    err = GetControlByID( window, &kMovNameTxtID, &control );

    mMovNameRef = control;

    ShowWindow(window);

#pragma mark -

#pragma mark - Main -

static void GetMovieFileFromUser()

    // prompt the user for a movie file

    OSStatus status = GetMovieFileURL( &mMovieFileURLref );

    if (status == noErr)

        if (mCurrentMovie)

            DisposeMovie(mCurrentMovie);

            mCurrentMovie = NULL;

        OSStatus status = GetMovieFromCFURLRef(&mMovieFileURLref, &mCurrentMovie);

        assert(status == noErr);

        SetControlTextToMovieName();

        EnableControl(mButtonRef);

        CFRelease(mMovieFileURLref);

int main(int argc, char* argv[])

    IBNibRef    nibRef;

    OSStatus    err;

    // Create a Nib reference passing the name of the nib file (without the .nib extension)

    // CreateNibReference only searches into the application bundle.

    err = CreateNibReference(CFSTR("main"), &nibRef);

    require_noerr( err, CantGetNibRef );

    // Once the nib reference is created, set the menu bar. "MainMenu" is the name of the menu bar

    // object. This name is set in InterfaceBuilder when the nib is created.

    err = SetMenuBarFromNib(nibRef, CFSTR("MenuBar"));

    require_noerr( err, CantSetMenuBar );

    MakeWindow(nibRef);

    // don't need the nib reference anymore.

    DisposeNibReference(nibRef);

    const       EventTypeSpec   commandProcessEvents[]  = { { kEventClassCommand, kEventCommandProcess } };

    InstallAppleEventHandlers();

    InstallApplicationEventHandler( NewEventHandlerUPP(CommandProcessEventHandler),

                                    GetEventTypeCount(commandProcessEvents),

                                    commandProcessEvents, NULL, NULL );

    // Must initialize QuickTime first

    InitializeQuickTime ();

    // Call the event loop

    RunApplicationEventLoop();

CantCreateWindow:

CantSetMenuBar:

CantGetNibRef:

    return err;

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