Utilisez le code suivant pour arrêter votre audio et créer fondu audio en cinq dernières secondes
- (void)getFadeAudioFile {
if (![appDelegate.musicFilePath isEqualToString:@"Not set"]) {
NSURL *url = [[[NSURL alloc]initWithString:appDelegate.musicFilePath]autorelease];
AVURLAsset* audioAsset = [[[AVURLAsset alloc]initWithURL:url options:nil]autorelease];
NSString *filePath = [self applicationDocumentsDirectory];
NSString *outputFilePath = nil;
outputFilePath = [filePath stringByAppendingPathComponent:@"/mySong.m4a"];
NSURL *outputFileUrl = [[[NSURL alloc]initFileURLWithPath:outputFilePath]autorelease];
NSError *theError = nil;
if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath])
[[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:&theError];
[self exportAsset:audioAsset toFilePath:outputFileUrl];
}
}
- (BOOL)exportAsset:(AVAsset *)avAsset toFilePath:(NSURL *)filePath {
// get the first audio track
NSArray *tracks = [avAsset tracksWithMediaType:AVMediaTypeAudio];
if ([tracks count] == 0) return NO;
AVAssetTrack *track = [tracks objectAtIndex:0];
// create the export session
// no need to retain here since the session will be retained by the
// completion handler since it is referenced there
AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:avAsset presetName:AVAssetExportPresetAppleM4A];
if (nil == exportSession) return NO;
NSLog(@"arrOfImagesForVideo.coun:%d",arrImageDataDict.count);
int imgCount = arrImageDataDict.count+1;
int delay = appDelegate.delaySecond;
int duration = imgCount*delay;
CMTime stopTime = CMTimeMake(duration, 1);
// create trim time range - 20 seconds starting from 30 seconds into the asset
// NSInteger totalTime = CMTimeGetSeconds(avAsset.duration);
CMTime startTime = CMTimeMake(0, 1);
//CMTime stopTime = CMTimeMake(totalTime, 1);//0,30
CMTimeRange exportTimeRange = CMTimeRangeFromTimeToTime(startTime, stopTime);
// create fade in time range - 10 seconds starting at the beginning of trimmed asset
NSInteger fadeTime = duration-5;
NSLog(@"fade time:%d",fadeTime);
NSLog(@"fade duration:%d",duration);
CMTime startFadeInTime = CMTimeMake(fadeTime, 1);
CMTime endFadeInTime = CMTimeMake(duration, 1);
CMTimeRange fadeInTimeRange = CMTimeRangeFromTimeToTime(startFadeInTime, endFadeInTime);
// setup audio mix
AVMutableAudioMix *exportAudioMix = [AVMutableAudioMix audioMix];
AVMutableAudioMixInputParameters *exportAudioMixInputParameters = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:track];
[exportAudioMixInputParameters setVolumeRampFromStartVolume:1.0 toEndVolume:0.0 timeRange:fadeInTimeRange];
exportAudioMix.inputParameters = [NSArray arrayWithObject:exportAudioMixInputParameters];
// configure export session output with all our parameters
exportSession.outputURL = filePath; // output path
exportSession.outputFileType = AVFileTypeAppleM4A; // output file type
exportSession.timeRange = exportTimeRange; // trim time range
exportSession.audioMix = exportAudioMix; // fade in audio mix
[exportSession exportAsynchronouslyWithCompletionHandler:
^(void) {
//[self saveVideoToAlbum:outputFilePath];
}
];
return YES;
}
Il sera enregistré dans votre répertoire de documents de chemin de fichier et l'utiliser comme
NSString *filePath = [self applicationDocumentsDirectory];
NSString *outputFilePath1 = [filePath tringByAppendingPathComponent:@"/mySong.m4a"];
NSURL *audio_inputFileUrl = [[NSURL alloc]initFileURLWithPath:outputFilePath1];
int imgCount = imageArray.count;
int delay = appDelegate.delaySecond;
NSLog(@"audio merged");
int duration = imgCount*delay;
CMTime seekingCM = CMTimeMake(duration, 1);
AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audio_inputFileUrl options:nil];
CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero, seekingCM);
AVMutableCompositionTrack *b_compositionAudioTrack = [mixComposition MutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
[b_compositionAudioTrack insertTimeRange:audio_timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:nextClipStartTime error:nil];
//[audioAsset autorelease];
newAudioTrack = [audioAsset tracksWithMediaType:AVMediaTypeAudio][0];