使用GPUIMage 添加图片、文字和gif水印

#import "ViewController.h"
#import "GPUImage.h"
#import 

@interface ViewController ()
@property (nonatomic , strong) UILabel  *mLabel;
@end


@implementation ViewController
{
GPUImageMovie *movieFile;
GPUImageOutput *filter;
GPUImageMovieWriter *movieWriter;
NSArray * _gifImages;
int _currenIndex;
NSTimeInterval _duration;
}

- (void)viewDidLoad {
[super viewDidLoad];
GPUImageView *filterView = [[GPUImageView alloc] initWithFrame:self.view.frame];
self.view = filterView;

self.mLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, 100, 100)];
self.mLabel.textColor = [UIColor redColor];
[self.view addSubview:self.mLabel];

// 滤镜
filter = [[GPUImageNormalBlendFilter alloc] init];

// [(GPUImageDissolveBlendFilter *)filter setMix:0.5];

// 播放
NSURL *sampleURL = [[NSBundle mainBundle] URLForResource:@"abc" withExtension:@"mp4"];
AVAsset *asset = [AVAsset assetWithURL:sampleURL];
CGSize size = self.view.bounds.size;
movieFile = [[GPUImageMovie alloc] initWithAsset:asset];
movieFile.runBenchmark = YES;
movieFile.playAtActualSpeed = YES;

// 水印
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
label.text = @"我是水印";
label.font = [UIFont systemFontOfSize:30];
label.textColor = [UIColor redColor];
[label sizeToFit];
UIImage *image = [UIImage imageNamed:@"watermark.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
imageView.frame= CGRectMake(0, 0, 40, 40);
UIView *subView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, size.height, size.width)];
subView.backgroundColor = [UIColor clearColor];
imageView.center = CGPointMake(subView.bounds.size.width / 2, subView.bounds.size.height / 2+80);
[subView addSubview:imageView];
[subView addSubview:label];


NSString *path = [[NSBundle mainBundle] pathForResource:@"lunchGif的副本.gif" ofType:nil] ;
NSData *imageData = [NSData dataWithContentsOfFile:path];

_gifImages = [NSArray array];
_gifImages = [self praseGIFDataToImageArray:imageData];
_duration = [self durationForGifData:imageData];
_currenIndex = 0;
UIImage *image1 = _gifImages[_currenIndex];
UIImageView *imageV = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, image1.size.width*0.3, image1.size.height *0.3)];
imageV.backgroundColor = [UIColor orangeColor];

imageV.image = _gifImages[_currenIndex];
imageView.contentMode = UIViewContentModeScaleAspectFit;
[subView addSubview:imageV];

GPUImageUIElement *uielement3 = [[GPUImageUIElement alloc] initWithView:subView];

NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.m4v"];
unlink([pathToMovie UTF8String]);
NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];

movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(640, 480)];

GPUImageFilter* progressFilter = [[GPUImageFilter alloc] init];
[movieFile addTarget:progressFilter];
[progressFilter addTarget:filter];
[uielement3 addTarget:filter];


movieWriter.shouldPassthroughAudio = YES;
movieFile.audioEncodingTarget = movieWriter;
[movieFile enableSynchronizedEncodingUsingMovieWriter:movieWriter];
// 显示到界面
[filter addTarget:filterView];
[filter addTarget:movieWriter];


[movieWriter startRecording];
[movieFile startProcessing];


CADisplayLink* dlink = [CADisplayLink displayLinkWithTarget:self selector:@selector(updateProgress)];
[dlink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
[dlink setPaused:NO];

__weak typeof(self) weakSelf = self;

[progressFilter setFrameProcessingCompletionBlock:^(GPUImageOutput *output, CMTime time) {
    dispatch_async(dispatch_get_main_queue(), ^{

        _currenIndex ++;
          imageV.image = _gifImages[_currenIndex];
          if (_currenIndex == _gifImages.count -1) {

              _currenIndex = 0;
          }
          [uielement3 update];

    });
    [uielement3 updateWithTimestamp:time];
}];

[movieWriter setCompletionBlock:^{
    __strong typeof(self) strongSelf = weakSelf;
    [strongSelf->filter removeTarget:strongSelf->movieWriter];
    [strongSelf->movieWriter finishRecording];
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(pathToMovie))
    {
        [library writeVideoAtPathToSavedPhotosAlbum:movieURL completionBlock:^(NSURL *assetURL, NSError *error)
         {
             dispatch_async(dispatch_get_main_queue(), ^{
                 
                 if (error) {
                     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"视频保存失败" message:nil
                                                                    delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                     [alert show];
                 } else {
                     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"视频保存成功" message:nil
                                                                    delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                     [alert show];
                 }
             });
         }];
    }
    else {
        NSLog(@"error mssg)");
    }
  }];
}



- (void)updateProgress
{
    self.mLabel.text = [NSString stringWithFormat:@"Progress:%d%%", (int)(movieFile.progress * 100)];
    [self.mLabel sizeToFit];
}


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}


 - (void)didReceiveMemoryWarning
  {
  [super didReceiveMemoryWarning];
}


//gif 转数组、
-(NSMutableArray *)praseGIFDataToImageArray:(NSData *)data;
{
NSMutableArray *frames = [[NSMutableArray alloc] init];
CGImageSourceRef src = CGImageSourceCreateWithData((CFDataRef)data, NULL);
CGFloat animationTime = 0.f;
if (src) {
    size_t l = CGImageSourceGetCount(src);
    frames = [NSMutableArray arrayWithCapacity:l];
    for (size_t i = 0; i < l; i++) {
        CGImageRef img = CGImageSourceCreateImageAtIndex(src, i, NULL);
        NSDictionary *properties = (NSDictionary *)CFBridgingRelease(CGImageSourceCopyPropertiesAtIndex(src, i, NULL));
        NSDictionary *frameProperties = [properties objectForKey:(NSString *)kCGImagePropertyGIFDictionary];
        NSNumber *delayTime = [frameProperties objectForKey:(NSString *)kCGImagePropertyGIFUnclampedDelayTime];
        animationTime += [delayTime floatValue];
        if (img) {
            [frames addObject:[UIImage imageWithCGImage:img]];
            CGImageRelease(img);
        }
    }
    CFRelease(src);
}
return frames;
}

//获取gif图片的总时长和循环次数
- (NSTimeInterval)durationForGifData:(NSData *)data{
//将GIF图片转换成对应的图片源
CGImageSourceRef gifSource = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
//获取其中图片源个数，即由多少帧图片组成
size_t frameCout = CGImageSourceGetCount(gifSource);
//定义数组存储拆分出来的图片
NSMutableArray* frames = [[NSMutableArray alloc] init];
NSTimeInterval totalDuration = 0;
for (size_t i=0; i