/*

     File: QTMediaSampleAuthor.m

 Abstract: 

 Utility class for writing raw media samples to a file.

  Version: 1.2

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 */

//---------------------------------------------------------------------------

//---------------------------------------------------------------------------

#import <libkern/OSAtomic.h>

//---------------------------------------------------------------------------

#import "QTMediaSampleNotifications.h"

#import "QTMediaSampleAuthor.h"

#import "QTMediaSampleAuthorOperation.h"

//---------------------------------------------------------------------------

//---------------------------------------------------------------------------

#define FILE_PERMS  0666

#define OPEN_PERMS  O_CREAT | O_WRONLY

//---------------------------------------------------------------------------

//---------------------------------------------------------------------------

#pragma mark -

#pragma mark Private Data Structure

//---------------------------------------------------------------------------

struct QTMediaSampleAuthorData

{

    BOOL                mbIsClosed;

    BOOL                mbIsSuspended;

    volatile int32_t    mnEnqueued;

    volatile int32_t    mnAdded;

    NSOperationQueue   *mpQueue;

    QTMediaSampleFile  *mpMedia;

}; // QTMediaSampleAuthorData

typedef struct QTMediaSampleAuthorData   QTMediaSampleAuthorData;

//---------------------------------------------------------------------------

//---------------------------------------------------------------------------

@implementation QTMediaSampleAuthor

//---------------------------------------------------------------------------

- (void) newOperationQueue

{

    mpAuthor->mpQueue = [NSOperationQueue new];

    [mpAuthor->mpQueue setMaxConcurrentOperationCount:1];

} // newOperationQueue

//---------------------------------------------------------------------------

//

// Make sure client goes through designated initializer

//

//---------------------------------------------------------------------------

- (id) init

{

    [self doesNotRecognizeSelector:_cmd];

    return nil;

} // init

//---------------------------------------------------------------------------

- (id) initMediaSampleAuthorWithPathName:(NSString *)thePathname

                         mediaSampleSize:(const NSSize *)theMediaSampleSize

{

    self = [super init];

    if( self )

    {

        mpAuthor = (QTMediaSampleAuthorDataRef)calloc(1, sizeof(QTMediaSampleAuthorData));

        if( mpAuthor != NULL )

        {

            mpAuthor->mpMedia = [[QTMediaSampleFile alloc] initWithPathname:thePathname

                                                                     access:FILE_PERMS

                                                                     create:OPEN_PERMS];

            if( mpAuthor->mpMedia )

            {

                if( [mpAuthor->mpMedia open] )

                {

                    mpAuthor->mbIsClosed = NO;

                } // if

                mpAuthor->mbIsSuspended = NO;

                mpAuthor->mnAdded    = 0;

                mpAuthor->mnEnqueued = 0;

                [self newOperationQueue];

            } // if

        } // if

        else

        {

            NSLog( @">> ERROR: QT Media Sample Author - Failure Allocating Memory For Attributes!" );

        } // else

    } // if

    return( self );

} // initMediaSampleAuthorWithPathName

//---------------------------------------------------------------------------

- (void) flushOperationQueue

{

    if( !mpAuthor->mbIsClosed )

    {

        [mpAuthor->mpQueue waitUntilAllOperationsAreFinished];

        if( mpAuthor->mpQueue )

        {

            [mpAuthor->mpQueue release];

            mpAuthor->mpQueue = nil;

        } // if

    } // if

} // flushOperationQueue

//---------------------------------------------------------------------------

- (void) closeMediaSampleFile

{

    if( !mpAuthor->mbIsClosed )

    {

        [mpAuthor->mpMedia close];

    } // if

    if( mpAuthor->mpMedia )

    {

        [mpAuthor->mpMedia release];

        mpAuthor->mpMedia = nil;

    } // if

} // closeMediaSampleFile

//---------------------------------------------------------------------------

- (void) releaseMediaSampleAuthorDataStore

{

    if( mpAuthor != NULL )

    {

        free( mpAuthor );

        mpAuthor = NULL;

    } // if

} // releaseMediaSampleAuthorDataStore

//---------------------------------------------------------------------------

- (void) cleanUpAuthor

{

    [self flushOperationQueue];

    [self closeMediaSampleFile];

    [self releaseMediaSampleAuthorDataStore];

} // cleanUpAuthor

//---------------------------------------------------------------------------

- (void) dealloc

{

    [self cleanUpAuthor];

    [super dealloc];

} // dealloc

//---------------------------------------------------------------------------

- (BOOL) isSuspended

{

    register uint32_t  value = (uint32_t)mpAuthor->mnEnqueued;

    register uint32_t  mask   = 150;

    register uint32_t  result = value ^ mask;

    return( !result );

} // isSuspended

//---------------------------------------------------------------------------

- (int32_t) count

{

    int32_t value = mpAuthor->mnEnqueued;

    return( value );

} // authoring

//---------------------------------------------------------------------------

- (int32_t) samples

{

    int32_t value = mpAuthor->mnAdded;

    return( value );

} // samples

//---------------------------------------------------------------------------

- (void) addMediaSampleToQueue:(QTMediaSample *)theMediaSample

{

    QTMediaSampleAuthorOperation *mediaSampleAuthorOp = [[QTMediaSampleAuthorOperation alloc] initMediaSampleAuthorOperation:theMediaSample

                                                                                                                        file:mpAuthor->mpMedia

                                                                                                                    enqueued:&mpAuthor->mnEnqueued

                                                                                                                     samples:&mpAuthor->mnAdded];

    if( mediaSampleAuthorOp )

    {

        [mpAuthor->mpQueue addOperation:mediaSampleAuthorOp];

        OSAtomicIncrement32Barrier( &mpAuthor->mnEnqueued );

        [mediaSampleAuthorOp release];

    } // if

} // addMediaSampleToQueue

//---------------------------------------------------------------------------

- (void) writeMediaSampleAsync:(QTMediaSample *)theMediaSample

{

    if( mpAuthor->mpQueue == nil )

    {

        [self newOperationQueue];

    } // if

    [self addMediaSampleToQueue:theMediaSample];

} // writeAsync

//---------------------------------------------------------------------------

- (void) writeFlushQueue

{

    mpAuthor->mbIsSuspended = [self isSuspended];

    if( mpAuthor->mbIsSuspended )

    {

        [[NSNotificationCenter defaultCenter] postNotificationName:QTMediaSampleAuthorIsSuspended

                                                            object:self];

        [self flushOperationQueue];

    } // if

} // writeFlushQueue

//---------------------------------------------------------------------------

- (BOOL) writeCanResume

{

    if( mpAuthor->mbIsSuspended )

    {

        [[NSNotificationCenter defaultCenter] postNotificationName:QTMediaSampleAuthorIsResumed

                                                            object:self];

        mpAuthor->mbIsSuspended = NO;

    } // if

    return mpAuthor->mbIsSuspended;

} // writeCanResume

//---------------------------------------------------------------------------

- (BOOL) writeAsync:(QTMediaSample *)theMediaSample

{

    [self writeFlushQueue];

    [self writeMediaSampleAsync:theMediaSample];

    return [self writeCanResume];

} // writeAsync

//---------------------------------------------------------------------------

- (BOOL) close

{

    [mpAuthor->mpQueue waitUntilAllOperationsAreFinished];

    mpAuthor->mbIsClosed = [mpAuthor->mpMedia close];

    return( mpAuthor->mbIsClosed );

} // close

//---------------------------------------------------------------------------

@end

//---------------------------------------------------------------------------

//---------------------------------------------------------------------------