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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<p><strong>View Source Code:</strong>
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<pre class="sourcecodebox">/*
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;
}
</pre>
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