使用CoreImage为本地视频添加滤镜
本文简单介绍使用CoreImage提供的CIFilter为本地视频添加滤镜并导出视频到本地的操作
直接贴代码
导入头文件
#import "AVFoundation/AVFoundation.h"
-(void)exportClick{
AVAsset *videoAsset = [AVURLAsset URLAssetWithURL:_filePath options:nil];//_filePath本地视频路径
CIFilter *filter = [CIFilter filterWithName:@"CIColorInvert"];
AVVideoComposition *composition = [AVVideoComposition videoCompositionWithAsset:videoAsset applyingCIFiltersWithHandler:^(AVAsynchronousCIImageFilteringRequest * _Nonnull request) {
NSLog(@"导出中");//针对每一帧的图像做滤镜处理
CIImage*source = request.sourceImage;
[filtersetValue:sourceforKey:@"inputImage"];
CIImage*resultImage = [filtervalueForKey:@"outputImage"];
[requestfinishWithImage:resultImagecontext:nil];
}];
AVAssetExportSession *exporter = [[AVAssetExportSession alloc]initWithAsset:videoAsset presetName:AVAssetExportPresetMediumQuality];
exporter.videoComposition= composition ;
exporter.outputURL = [NSURL fileURLWithPath:[self fileSavePathWithFileName:@"test"]];
exporter.shouldOptimizeForNetworkUse = YES;
exporter.outputFileType = AVFileTypeQuickTimeMovie;
[exporterexportAsynchronouslyWithCompletionHandler:^{
switch(exporter.status) {
case AVAssetExportSessionStatusFailed:
NSLog(@"exporting failed %@",[exportererror]);
break;
case AVAssetExportSessionStatusCompleted:
NSLog(@"导出完成");
break;
case AVAssetExportSessionStatusCancelled:
NSLog(@"export cancelled");
break;
case AVAssetExportSessionStatusUnknown:
break;
case AVAssetExportSessionStatusWaiting:
break;
case AVAssetExportSessionStatusExporting:
break;
}
}];
}
//视频存放路径
-(NSString*)fileSavePathWithFileName:(NSString*)fileName{
NSFileManager* fileManager = [NSFileManager defaultManager];
NSString*filePath = [NSStringstringWithFormat:@"%@/Vidio/%@.mp4",DOCUMENTPATH,fileName];//视频存放位置
NSString *folderPath = [NSString stringWithFormat:@"%@/Vidio", DOCUMENTPATH];
BOOL blHave=[[NSFileManager defaultManager] fileExistsAtPath:filePath];
if(blHave) {
BOOLblDele= [fileManagerremoveItemAtPath:filePatherror:nil];
if(!blDele) {
[fileManagerremoveItemAtPath:filePatherror:nil];
}
}
//判断视频存放文件夹是否存在，不存在创建
BOOL blHave1=[[NSFileManager defaultManager] fileExistsAtPath:folderPath];
if(!blHave1) {
[fileManagercreateDirectoryAtPath:folderPath withIntermediateDirectories:YES attributes:nil error:nil];
}
NSLog(@"视频输出地址 fileSavePath = %@",filePath);
returnfilePath;
}
github地址：https://github.com/duchengdong/CIFilter
以上～～
