视频水印

#pragma mark =====下面是合成视频的方法===========

- (void)vision:(PBJVision *)vision capturedVideo:(NSDictionary *)videoDict error:(NSError *)error

{

    _recording = NO; //这句可能是控制完成存储之后就不能再录的。。。

    

    if (error) {

        NSLog(@"encounted an error in video capture (%@)", error);

        return;

    }

    _currentVideo = videoDict;

    NSString *videoPath = [_currentVideo  objectForKey:PBJVisionVideoPathKey];

 

    

    NSString* videoName = @"export.mov"; //这里换成wmv格式的就不行了。

    NSString *exportPath = [NSTemporaryDirectory() stringByAppendingPathComponent:videoName];

    

    [self loadVideoByPath:videoPath andSavePath:exportPath];

    

    

    

}

 

#pragma mark ==== 合成的========

 

- (void) loadVideoByPath:(NSString*) v_strVideoPath andSavePath:(NSString*) v_strSavePath {

    

     NSLog(@"\nv_strVideoPath = %@ \nv_strSavePath = %@\n ",v_strVideoPath,v_strSavePath);

     AVAsset *avAsset = [AVAsset assetWithURL:[NSURL fileURLWithPath:v_strVideoPath]];

     CMTime assetTime = [avAsset duration];

     Float64 duration = CMTimeGetSeconds(assetTime);

     NSLog(@"视频时长 %f\n",duration);

    

     AVMutableComposition *avMutableComposition = [AVMutableCompositioncomposition];

    

     AVMutableCompositionTrack *avMutableCompositionTrack = [avMutableComposition addMutableTrackWithMediaType:AVMediaTypeVideopreferredTrackID:kCMPersistentTrackID_Invalid];

    

     AVAssetTrack *avAssetTrack = [[avAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];

    

     NSError *error = nil;

     // 这块是裁剪,rangtime .前面的是开始时间,后面是裁剪多长

     [avMutableCompositionTrack insertTimeRange:CMTimeRangeMake(CMTimeMakeWithSeconds(0.1f, 30), CMTimeMakeWithSeconds(duration, 30))

                      ofTrack:avAssetTrack

                       atTime:kCMTimeZero

                       error:&error];

    

     AVMutableVideoComposition *avMutableVideoComposition = [AVMutableVideoCompositionvideoComposition];

    

     avMutableVideoComposition.renderSize = CGSizeMake(320.0f, 480.0f);

     avMutableVideoComposition.frameDuration = CMTimeMake(1, 30);

    

//     CALayer *animatedTitleLayer = [self buildAnimatedTitleLayerForSize:CGSizeMake(320, 88)];

    

    UIImage *waterMarkImage = [UIImage imageNamed:@"logo.png"];

    CALayer *waterMarkLayer = [CALayer layer];

    waterMarkLayer.frame = CGRectMake(0, 60, 320, 222);

    waterMarkLayer.contents = (id)waterMarkImage.CGImage;

    

    

     CALayer *parentLayer = [CALayer layer];

     CALayer *videoLayer = [CALayer layer];

     parentLayer.frame = CGRectMake(0, 0, 320, 480);

     videoLayer.frame = CGRectMake(0, 0, 320, 480);

     [parentLayer addSublayer:videoLayer];

     [parentLayer addSublayer:waterMarkLayer];

     avMutableVideoComposition.animationTool = [AVVideoCompositionCoreAnimationToolvideoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];

    

     AVMutableVideoCompositionInstruction *avMutableVideoCompositionInstruction = [AVMutableVideoCompositionInstructionvideoCompositionInstruction];

    

     [avMutableVideoCompositionInstruction setTimeRange:CMTimeRangeMake(kCMTimeZero, [avMutableComposition duration])];

    

     AVMutableVideoCompositionLayerInstruction *avMutableVideoCompositionLayerInstruction = [AVMutableVideoCompositionLayerInstructionvideoCompositionLayerInstructionWithAssetTrack:avAssetTrack];

     [avMutableVideoCompositionLayerInstruction setTransform:avAssetTrack.preferredTransform atTime:kCMTimeZero];

    

     avMutableVideoCompositionInstruction.layerInstructions = [NSArray arrayWithObject:avMutableVideoCompositionLayerInstruction];

    

    

     avMutableVideoComposition.instructions = [NSArray arrayWithObject:avMutableVideoCompositionInstruction];

    

    

     NSFileManager *fm = [[NSFileManageralloc] init];

     if ([fm fileExistsAtPath:v_strSavePath]) {

          NSLog(@"video is have. then delete that");

          if ([fm removeItemAtPath:v_strSavePath error:&error]) {

               NSLog(@"delete is ok");

              }else {

                   NSLog(@"delete is no error = %@",error.description);

                  }

         }

    

    

     AVAssetExportSession *avAssetExportSession = [[AVAssetExportSessionalloc] initWithAsset:avMutableComposition presetName:AVAssetExportPreset640x480];

     [avAssetExportSession setVideoComposition:avMutableVideoComposition];

     [avAssetExportSession setOutputURL:[NSURL fileURLWithPath:v_strSavePath]];

     avAssetExportSession.outputFileType = @"com.apple.quicktime-movie";

//     [avAssetExportSession setOutputFileType:AVFileTypeQuickTimeMovie];//这句话要是要的话，会出错的。。。

     [avAssetExportSession setShouldOptimizeForNetworkUse:YES];

     [avAssetExportSession exportAsynchronouslyWithCompletionHandler:^(void){

 

 

 

 

 

 

 

 

//其实只要进入这个方法合成就已经成功了。。。。不需要再用下面的switch 了。。。这个问题我找了三天。。。终于发现了。。。。。。。把下面的switch语句删除就行了。，直接把成功以后的代码写到本方法就ok了。。。。。。。。。。。。。。。。。。。

          switch (avAssetExportSession.status) {

                   caseAVAssetExportSessionStatusFailed:

                    NSLog(@"exporting failed %@",[avAssetExportSession error]);

                    break;

                   caseAVAssetExportSessionStatusCompleted:

                    NSLog(@"exporting completed");

                  //下面是按照上面的要求合成视频的过程。

                       // 下面是把视频存到本地相册里面，存储完后弹出对话框。

                  NSLog(@"该视频的大小为：%lf M",[self fileSizeAtPath:v_strSavePath]);

                       [_assetLibrary writeVideoAtPathToSavedPhotosAlbum:avAssetExportSession.outputURL completionBlock:^(NSURL *assetURL, NSError *error1) {

                           UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"好的!" message: @"整合并保存成功！"

                                                                          delegate:nil

                                                                 cancelButtonTitle:@"OK"

                                                                 otherButtonTitles:nil];

                           [alert show];

                           

                       }];

                    break;

                   caseAVAssetExportSessionStatusCancelled:

                  

            

                  NSLog(@"export cancelled");

                 

                    break;

              }

         }];

     if (avAssetExportSession.status != AVAssetExportSessionStatusCompleted){

          NSLog(@"Retry export");

         }

}

 

- (CALayer *)buildAnimatedTitleLayerForSize:(CGSize)videoSize

{

     // 视频的显示大小

     CGSize dataLayerSize = CGSizeMake(320.0f, 88.0f);

     // Create a layer for the overall title animation.

     CALayer *animatedTitleLayer = [CALayer layer];

     // 由于旋转过了,所以高与宽互相转换了,原来 480*640 由于旋转 成了640*480

     // 他们的起点还是左下角

     animatedTitleLayer.frame = CGRectMake(0.0f, 0, dataLayerSize.width, dataLayerSize.height);

     animatedTitleLayer.backgroundColor = [UIColor clearColor].CGColor;

     // 水印

     UIImage *waterMarkImage = [UIImage imageNamed:@"logo.png"];

     CALayer *waterMarkLayer = [CALayer layer];

     waterMarkLayer.contents = (id)waterMarkImage.CGImage ;

     waterMarkLayer.frame = CGRectMake(0, 0, 320, 88);

     waterMarkLayer.opacity = 0.6f;

     // 文字

     CATextLayer *textLayer = [CATextLayer layer];

     textLayer.string = @"Add your context";

     textLayer.font = (__bridge CFTypeRef)(@"Helvetica");

     textLayer.fontSize = 20.0f;

     textLayer.shadowOpacity = 0.6f ;

     textLayer.backgroundColor = [UIColorclearColor].CGColor ;

     textLayer.foregroundColor = [UIColorredColor].CGColor ;

     textLayer.frame = CGRectMake(15.0f, dataLayerSize.height-20.0f-15.0f, dataLayerSize.width, 20.0f);

     [animatedTitleLayer addSublayer:waterMarkLayer];

     [animatedTitleLayer addSublayer:textLayer];

     return animatedTitleLayer;

}

//单个文件的大小

//- (long long) fileSizeAtPath:(NSString*) filePath{

//    NSFileManager* manager = [NSFileManager defaultManager];

//    if ([manager fileExistsAtPath:filePath]){

//        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];

//    }

//    return 0;

//}

//遍历文件夹获得文件夹大小，返回多少M

- (float ) folderSizeAtPath:(NSString*) folderPath{

    NSFileManager* manager = [NSFileManagerdefaultManager];

    if (![manager fileExistsAtPath:folderPath]) return 0;

    NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];

    NSString* fileName;

    long long folderSize = 0;

    while ((fileName = [childFilesEnumerator nextObject]) != nil){

        NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];

        folderSize += [self fileSizeAtPath:fileAbsolutePath];

    }

    return folderSize/(1024.0*1024.0);

 

}