参数介绍

//audioPath1 第一个音频路径

//audioPath2第二个音频路径

//outputPath合成之后的音频路径

+ (void)mixAudio:(NSString *)audioPath1 andAudio:(NSString *)audioPath2 toFile:(NSString *)outputPath

{

NSMutableArray *arrary = [[NSMutableArray alloc]init];

NSURL *url = [NSURL fileURLWithPath:audioPath1];

AVAsset *avset = [AVAsset assetWithURL:url];

NSURL *url1 = [NSURL fileURLWithPath:audioPath2];

AVAsset *avset1 = [AVAsset assetWithURL:url1];

[arrary addObject:avset];

[arrary addObject:avset1];

AVMutableComposition *mainComposition = [[AVMutableComposition alloc] init];

AVMutableCompositionTrack *soundtrackTrack = [mainComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];

CMTime insertTime = kCMTimeZero;

for(AVAsset *videoAsset in arrary)

{

[soundtrackTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:insertTime error:nil];

// Updating the insertTime for the next insert

insertTime = CMTimeAdd(insertTime, videoAsset.duration);

}

NSURL *outptVideoUrl = [NSURL fileURLWithPath:outputPath];

AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mainComposition presetName:AVAssetExportPresetAppleM4A];

// Setting attributes of the exporter

exporter.outputURL=outptVideoUrl;

exporter.outputFileType =@"com.apple.m4a-audio"; //AVFileTypeQuickTimeMovie;

exporter.shouldOptimizeForNetworkUse = YES;

[exporter exportAsynchronouslyWithCompletionHandler:^{

dispatch_async(dispatch_get_main_queue(), ^{

//completion(exporter);

// [self exportDidFinish:exporter];

// [self exportDidFinish:exporter:assets];

NSLog(@"-----合并完成-----");

[[NSNotificationCenter defaultCenter]postNotificationName:@"success" object:nil];

});

}];

}