IOS视频添加背景音乐&原音

//抽取原视频的音频与需要的音乐混合

-(void)addmusic:(id)sender

{

[MBProgressHUDshowHUDAddedTo:self.viewanimated:YES];

AVMutableComposition*composition =[AVMutableCompositioncomposition];

audioMixParams =[[NSMutableArrayalloc]initWithObjects:nil];

//录制的视频

NSURL*video_inputFileUrl =[NSURLfileURLWithPath:self.videoPath];

AVURLAsset*songAsset =[AVURLAssetURLAssetWithURL:video_inputFileUrloptions:nil];

CMTime startTime =CMTimeMakeWithSeconds(0,songAsset.duration.timescale);

CMTime trackDuration =songAsset.duration;

//获取视频中的音频素材

[selfsetUpAndAddAudioAtPath:video_inputFileUrltoComposition:compositionstart:startTimedura:trackDurationoffset:CMTimeMake(14*44100,44100)];

//本地要插入的音乐

NSString*bundleDirectory =[[NSBundlemainBundle]bundlePath];

NSString*path = [bundleDirectorystringByAppendingPathComponent:@"30secs.mp3"];

NSURL*assetURL2=[NSURLfileURLWithPath:path];

//获取设置完的本地音乐素材

[selfsetUpAndAddAudioAtPath:assetURL2toComposition:compositionstart:startTimedura:trackDurationoffset:CMTimeMake(0,44100)];

//创建一个可变的音频混合

AVMutableAudioMix*audioMix =[AVMutableAudioMixaudioMix];

audioMix.inputParameters=[NSArrayarrayWithArray:audioMixParams];//从数组里取出处理后的音频轨道参数

//创建一个输出

AVAssetExportSession*exporter =[[AVAssetExportSessionalloc]

initWithAsset:composition

presetName:AVAssetExportPresetAppleM4A];

exporter.audioMix= audioMix;

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

NSString* fileName =[NSStringstringWithFormat:@"%@.mov",@"overMix"];

//输出路径

NSString*exportFile =[NSStringstringWithFormat:@"%@/%@",[selfgetLibarayPath],fileName];

if([[NSFileManagerdefaultManager]fileExistsAtPath:exportFile]) {

[[NSFileManagerdefaultManager]removeItemAtPath:exportFileerror:nil];

}

NSLog(@"是否在主线程1%d",[NSThreadisMainThread]);

NSLog(@"输出路径===%@",exportFile);

NSURL*exportURL =[NSURLfileURLWithPath:exportFile];

exporter.outputURL= exportURL;

self.mixURL=exportURL;

[exporterexportAsynchronouslyWithCompletionHandler:^{

intexportStatus =(int)exporter.status;

switch(exportStatus){

caseAVAssetExportSessionStatusFailed:{

NSError*exportError =exporter.error;

NSLog(@"错误，信息: %@", exportError);

[MBProgressHUDhideHUDForView:self.viewanimated:YES];

break;

}

caseAVAssetExportSessionStatusCompleted:{

NSLog(@"是否在主线程2%d",[NSThreadisMainThread]);

NSLog(@"成功");

//最终混合

[selftheVideoWithMixMusic];

break;

}

}

}];

}

//最终音频和视频混合

-(void)theVideoWithMixMusic

{

NSError*error =nil;

NSFileManager*fileMgr =[NSFileManagerdefaultManager];

NSString*documentsDirectory =[NSHomeDirectory()

stringByAppendingPathComponent:@"Documents"];

NSString*videoOutputPath =[documentsDirectorystringByAppendingPathComponent:@"test_output.mp4"];

if([fileMgrremoveItemAtPath:videoOutputPatherror:&error]!=YES) {

NSLog(@"无法删除文件，错误信息：%@",[errorlocalizedDescription]);

}

//声音来源路径（最终混合的音频）

NSURL   *audio_inputFileUrl =self.mixURL;

//视频来源路径

NSURL   *video_inputFileUrl = [NSURLfileURLWithPath:self.videoPath];

//最终合成输出路径

NSString*outputFilePath =[documentsDirectorystringByAppendingPathComponent:@"final_video.mp4"];

NSURL   *outputFileUrl = [NSURLfileURLWithPath:outputFilePath];

if([[NSFileManagerdefaultManager]fileExistsAtPath:outputFilePath])

[[NSFileManagerdefaultManager]removeItemAtPath:outputFilePatherror:nil];

CMTime nextClipStartTime =kCMTimeZero;

//创建可变的音频视频组合

AVMutableComposition* mixComposition =[AVMutableCompositioncomposition];

//视频采集

AVURLAsset* videoAsset =[[AVURLAssetalloc]initWithURL:video_inputFileUrloptions:nil];

CMTimeRange video_timeRange =CMTimeRangeMake(kCMTimeZero,videoAsset.duration);

AVMutableCompositionTrack*a_compositionVideoTrack = [mixCompositionaddMutableTrackWithMediaType:AVMediaTypeVideopreferredTrackID:kCMPersistentTrackID_Invalid];

[a_compositionVideoTrackinsertTimeRange:video_timeRangeofTrack:[[videoAssettracksWithMediaType:AVMediaTypeVideo]objectAtIndex:0]atTime:nextClipStartTimeerror:nil];

//声音采集

AVURLAsset* audioAsset =[[AVURLAssetalloc]initWithURL:audio_inputFileUrloptions:nil];

CMTimeRange audio_timeRange =CMTimeRangeMake(kCMTimeZero,videoAsset.duration);//声音长度截取范围==视频长度

AVMutableCompositionTrack*b_compositionAudioTrack = [mixCompositionaddMutableTrackWithMediaType:AVMediaTypeAudiopreferredTrackID:kCMPersistentTrackID_Invalid];

[b_compositionAudioTrackinsertTimeRange:audio_timeRangeofTrack:[[audioAssettracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0]atTime:nextClipStartTimeerror:nil];

//创建一个输出

AVAssetExportSession* _assetExport =[[AVAssetExportSessionalloc]initWithAsset:mixCompositionpresetName:AVAssetExportPresetMediumQuality];

_assetExport.outputFileType=AVFileTypeQuickTimeMovie;

_assetExport.outputURL=outputFileUrl;

_assetExport.shouldOptimizeForNetworkUse=YES;

self.theEndVideoURL=outputFileUrl;

[_assetExportexportAsynchronouslyWithCompletionHandler:

^(void) {

[MBProgressHUDhideHUDForView:self.viewanimated:YES];

//播放

NSURL*url = [NSURLfileURLWithPath:outputFilePath];

MPMoviePlayerViewController*theMovie =[[MPMoviePlayerViewControlleralloc]initWithContentURL:url];

[selfpresentMoviePlayerViewControllerAnimated:theMovie];

theMovie.moviePlayer.movieSourceType=MPMovieSourceTypeFile;

[theMovie.moviePlayerplay];

}

];

NSLog(@"完成！输出路径==%@",outputFilePath);

}

//通过文件路径建立和添加音频素材

- (void)setUpAndAddAudioAtPath:(NSURL*)assetURLtoComposition:(AVMutableComposition*)compositionstart:(CMTime)startdura:(CMTime)duraoffset:(CMTime)offset{

AVURLAsset*songAsset =[AVURLAssetURLAssetWithURL:assetURLoptions:nil];

AVMutableCompositionTrack*track =[compositionaddMutableTrackWithMediaType:AVMediaTypeAudiopreferredTrackID:kCMPersistentTrackID_Invalid];

AVAssetTrack*sourceAudioTrack =[[songAssettracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0];

NSError*error =nil;

BOOLok =NO;

CMTime startTime = start;

CMTime trackDuration = dura;

CMTimeRange tRange =CMTimeRangeMake(startTime,trackDuration);

//设置音量

//AVMutableAudioMixInputParameters（输入参数可变的音频混合）

//audioMixInputParametersWithTrack（音频混音输入参数与轨道）

AVMutableAudioMixInputParameters*trackMix =[AVMutableAudioMixInputParametersaudioMixInputParametersWithTrack:track];

[trackMixsetVolume:0.8fatTime:startTime];

//素材加入数组

[audioMixParamsaddObject:trackMix];

//Insert audio into track  //offsetCMTimeMake(0, 44100)

ok = [trackinsertTimeRange:tRangeofTrack:sourceAudioTrackatTime:kCMTimeInvaliderror:&error];

}

#pragma mark - 保存路径

-(NSString*)getLibarayPath

{

NSFileManager*fileManager =[NSFileManagerdefaultManager];

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

NSString* path = [pathsobjectAtIndex:0];

NSString*movDirectory = [pathstringByAppendingPathComponent:@"tmpMovMix"];

[fileManagercreateDirectoryAtPath:movDirectorywithIntermediateDirectories:YESattributes:nilerror:nil];

returnmovDirectory;

}