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Welcome to the GPUImage-waterMark wiki! 完美解决GPUImage加水印的需求，在视频录制的任意时刻加自定义水印，修改水印，移除水印。 一、开启实时视频

•(void)videoFilter{ //GPUImageVideoCamera 必须声明为 全局变量或属性，否则开不到视频

videoCamera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPreset640x480 cameraPosition:AVCaptureDevicePositionFront]; videoCamera.outputImageOrientation = UIInterfaceOrientationPortrait;

//画面镜像 videoCamera.horizontallyMirrorFrontFacingCamera = YES;

//视图对象 filterView = [[GPUImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, ScreenWidth, ScreenHeight)];

filterView.center = self.view.center; [self.view insertSubview:filterView atIndex:0];

//过滤器 beautifyFilter = [[GPUImageBeautifyFilter alloc] init]; [videoCamera addTarget:beautifyFilter]; [beautifyFilter addTarget:filterView];

[videoCamera startCameraCapture];/到此开启视频/

/为加水印初始化对象/ //加水印的过滤器 blendFilter = [[GPUImageAlphaBlendFilter alloc] init]; blendFilter.mix = 1.0;

/为录制初始化对象/

//将视频流写到文件 NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.m4v"]; unlink([pathToMovie UTF8String]); NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie]; movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(480.0, 640.0)];

//添加录制对象 [beautifyFilter addTarget:movieWriter];

//添加音频输入 videoCamera.audioEncodingTarget = movieWriter;

movieWriter.shouldPassthroughAudio = YES;

}

二、录制视频

•(IBAction)clickRecord:(UIButton*)sender {

if (sender.tag == 0) { sender.tag = 1; /开启这个方法，....../

// movieWriter.encodingLiveVideo = YES; //调用刻录方法 [movieWriter startRecording]; [sender setTitle:@"停止录制" forState:UIControlStateNormal]; } else { sender.tag = 0; [sender setTitle:@"开始录制" forState:UIControlStateNormal]; //滤镜移除输出视频流对象 [beautifyFilter removeTarget:movieWriter]; //调用完成刻录方法 [movieWriter finishRecording]; //注销音频输入 videoCamera.audioEncodingTarget = nil; /水印过滤器移除录制对象/ [blendFilter removeTarget:movieWriter]; }

} 三、加上水印

•(IBAction)addWaterMask:(UIButton*)sender {

if (sender.tag == 0) { sender.tag = 1;

/初始化水印视图/ UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, filterView.frame.size.width,filterView.frame.size.height)]; contentView.backgroundColor = [UIColor clearColor]; UIImage *image = [UIImage imageNamed:@"waterMark"]; UIImageView *ivTemp = [[UIImageView alloc] initWithFrame:CGRectMake(0, 150, image.size.width, image.size.height)]; ivTemp.image = image; ivTemp.tag = 500; ivTemp.hidden = NO; [contentView addSubview:ivTemp];

if (_uiElementInput) { [_uiElementInput removeAllTargets];

} if (beautifyFilter) { [beautifyFilter removeTarget:filterView];

}

if (!_uiElementInput) { _uiElementInput = [[GPUImageUIElement alloc] initWithView:contentView]; } if (blendFilter) { [blendFilter removeAllTargets]; }

[beautifyFilter addTarget:blendFilter]; [_uiElementInput addTarget:blendFilter]; [blendFilter addTarget:filterView];

/一定要把beautyFilter的视频流对象movieWriter移除，在赋值给水印过滤器blendFilter/ [beautifyFilter removeTarget:movieWriter]; [blendFilter addTarget:movieWriter];

__weak typeof(self) weakSelf = self; [beautifyFilter setFrameProcessingCompletionBlock:^(GPUImageOutput * filter, CMTime frameTime){ // [contentView viewWithTag:500].hidden = NO; [weakSelf.uiElementInput update];/一定要调用 GPUImageUIElement 对象的update，对每一帧图片加水印处理/ }]; // _writefilter = blendFilter;/这里是借鉴了别人的，加上好像没什么用/

} else {

sender.tag = 0; /显示视图的切换/ [blendFilter removeTarget:filterView]; [beautifyFilter addTarget:filterView];

/视频流对象切换/ [blendFilter removeTarget:movieWriter]; [beautifyFilter addTarget:movieWriter];

} }

有兴趣的同学可以继续研究水印动画、