/*

     File: AVSEExportCommand.m

 Abstract: A subclass of AVSECommand which handles AVAssetExportSession. It exports AVMutableComposition along with AVMutableVideoComposition and AVMutableAudioMix to a Quicktime movie.

  Version: 1.0

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 */

#import "AVSEExportCommand.h"

@implementation AVSEExportCommand

@synthesize mutableComposition;

@synthesize mutableVideoComposition;

@synthesize mutableAudioMix;

- (void)performWithAsset:(AVAsset *)asset

{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDesktopDirectory, NSUserDomainMask, YES);

    NSString *outputURL = [paths objectAtIndex:0];

    NSFileManager *manager = [NSFileManager defaultManager];

    [manager createDirectoryAtPath:outputURL withIntermediateDirectories:YES attributes:nil error:nil];

    outputURL = [outputURL stringByAppendingPathComponent:@"output.mp4"];

    // Remove Existing File

    [manager removeItemAtPath:outputURL error:nil];

    //dispatch_queue_t exportQueue = dispatch_queue_create("Export Queue", NULL);

    // Create an export session with the composition

    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:[mutableComposition copy] presetName:AVAssetExportPreset1280x720];

    exportSession.videoComposition = mutableVideoComposition;

    exportSession.audioMix = mutableAudioMix;

    exportSession.outputURL = [NSURL fileURLWithPath:outputURL];

    exportSession.outputFileType=AVFileTypeQuickTimeMovie;

    [exportSession exportAsynchronouslyWithCompletionHandler:^(void){

        switch (exportSession.status) {

            case AVAssetExportSessionStatusCompleted:

                // Notify AVSEDocument about export completion 

                [[NSNotificationCenter defaultCenter] 

                 postNotificationName:AVSEExportNotification

                 object:self];

                break;

            case AVAssetExportSessionStatusFailed:

                //

                NSLog(@"Failed:%@",exportSession.error);

                break;

            case AVAssetExportSessionStatusCancelled:

                //

                NSLog(@"Canceled:%@",exportSession.error);

                break;

            default:

                break;

        }

    }];

}

@end