GPUImage录像的一些备忘
From: http://www.hudongdong.com/ios/530.html
GPUImage在加滤镜、图像处理上面集成的很完善，现在在使用的时候碰到的一些问题做下总结备忘，这些都是弄了很长时间才找到原因，如果碰到相似的可以节省下时间。当然简单的使用也可以看这个文章《IOS使用GPUImage滤镜初级试水》
1、摄像头左右相反
使用GPU录像的时候，如果前置摄像头在左右是相反的，那么需要设置下镜像设置了
//如果是调用前置摄像头就发现成的像是左右相反了，就看下是不是开启了镜像
self.videoCamera.horizontallyMirrorFrontFacingCamera = YES;
self.videoCamera.horizontallyMirrorRearFacingCamera = NO;
2、开始录像的时候会图像会高亮下
如果录像的额时候，图像高亮下，可以在初始化GPUImageVideoCamera的时候，加上
[m_videoCamera addAudioInputsAndOutputs];
这个是为camera的增加的声音输入，但是这个如果是在一个界面的时候，频繁的增加有可能会造成录制的画面卡顿，所以可以在界面初始化Viewdidload的时候，初始化camera的时候加上这个代码。
3、第一帧偶尔黑屏
如果第一帧黑屏，应该是在开始录制等时间的问题，可以把要使用的视频第一帧裁减掉，裁剪视频的方案晚点会写成一个总结。
4、暂停/重录视频
如果仅仅是暂停录制，不暂停摄像头画面
//录制暂停
[m_movieWriter setPaused:true];
//录制继续
[m_movieWriter setPaused:false];
如果是暂停录制，并且也要暂停摄像头画面
//录制暂停
[m_movieWriter setPaused:true];
//摄像头暂停
[m_videoCamera pauseCameraCapture];
//录制继续
[m_movieWriter setPaused:false];
//摄像头继续
[m_videoCamera resumeCameraCapture];
5、暂停又重录会黑屏或者最后几秒有画面没声音
可以进入GPUImageMovieWriter.m中，在
- (void)processAudioBuffer:(CMSampleBufferRef)audioBuffer;
把里面的一段函数先注销掉
if (offsetTime.value > 0) {
CFRelease(audioBuffer);
audioBuffer = [self adjustTime:audioBuffer by:offsetTime];
CFRetain(audioBuffer);
}
6、视频录制的代码
6.1、设置变量
//摄像头
GPUImageVideoCamera *m_videoCamera;
GPUImageFilter *m_customFilter;
GPUImageView *m_filteredVideoView;
//录制
GPUImageMovieWriter *m_movieWriter;
NSMutableDictionary * videoSettings; //字面意思.视频设置
NSDictionary * audioSettings; //声音设置
6.2、初始化摄像头
m_videoCamera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPreset1280x720 cameraPosition:AVCaptureDevicePositionBack];
// [m_videoCamera setFrameRate:60];
//前置摄像头
m_videoCamera.horizontallyMirrorFrontFacingCamera = YES;
m_videoCamera.horizontallyMirrorRearFacingCamera = NO;
m_videoCamera.outputImageOrientation = UIInterfaceOrientationPortrait;
[m_videoCamera addAudioInputsAndOutputs];
// m_customFilter = [[AmomoFilter alloc] init];
m_customFilter = [[GPUImageFilter alloc] init];
m_filteredVideoView = [[GPUImageView alloc] initWithFrame:CGRectMake(0.0,0.0,JLXScreenSize.width,JLXScreenSize.height)];
// Add the view somewhere so it's visible
[self.view addSubview:m_filteredVideoView];
//添加滤镜
[m_videoCamera addTarget:m_customFilter];
[m_customFilter addTarget:m_filteredVideoView];
[m_videoCamera startCameraCapture];
6.3、初始化movieWriter
-(void)initcustomWriter
{
oldVideoPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie4.mov"];
unlink([oldVideoPath UTF8String]); // 如果已经存在文件，AVAssetWriter会有异常，删除旧文件
NSURL *movieURL = [JLXNetTools conVertToURL:oldVideoPath];
//视频设置
videoSettings = [[NSMutableDictionary alloc] init];
[videoSettings setObject:AVVideoCodecH264 forKey:AVVideoCodecKey];
[videoSettings setObject:[NSNumber numberWithInteger:720] forKey:AVVideoWidthKey]; //视频的宽度,这里最好是定义imageCamera时候的宽度
[videoSettings setObject:[NSNumber numberWithInteger:1280] forKey:AVVideoHeightKey]; //视频的高度.同上
//音频设置
AudioChannelLayout channelLayout;
memset(&channelLayout, 0, sizeof(AudioChannelLayout));
channelLayout.mChannelLayoutTag = kAudioChannelLayoutTag_Stereo;
audioSettings = [NSDictionary dictionaryWithObjectsAndKeys:
[ NSNumber numberWithInt: kAudioFormatMPEG4AAC], AVFormatIDKey,
[ NSNumber numberWithInt: 2 ], AVNumberOfChannelsKey,
[ NSNumber numberWithFloat: 16000.0 ], AVSampleRateKey,
[ NSData dataWithBytes:&channelLayout length: sizeof( AudioChannelLayout ) ], AVChannelLayoutKey,
[ NSNumber numberWithInt: 32000 ], AVEncoderBitRateKey,
nil];
m_movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(720, 1280) fileType:AVFileTypeQuickTimeMovie outputSettings:videoSettings];
// [m_movieWriter setHasAudioTrack:YES audioSettings:audioSettings];
[m_movieWriter setHasAudioTrack:true];
m_videoCamera.audioEncodingTarget = m_movieWriter; //设置声音
// m_movieWriter.assetWriter.movieFragmentInterval = kCMTimeInvalid; //Couldn't write a frame
m_movieWriter.encodingLiveVideo = YES;
[m_customFilter addTarget:m_movieWriter];
}
6.4、开始录制
[m_movieWriter startRecording];
6.5、结束录制
[m_movieWriter finishRecordingWithCompletionHandler:^{
}];
[m_customFilter removeTarget:m_movieWriter];
m_videoCamera.audioEncodingTarget = nil;
6.6、暂停/重录视频
如果仅仅是暂停录制，不暂停摄像头画面
//录制暂停
[m_movieWriter setPaused:true];
//录制继续
[m_movieWriter setPaused:false];
如果是暂停录制，并且也要暂停摄像头画面
//录制暂停
[m_movieWriter setPaused:true];
//摄像头暂停
[m_videoCamera pauseCameraCapture];
//录制继续
[m_movieWriter setPaused:false];
//摄像头继续
[m_videoCamera resumeCameraCapture];
6.7、取消录制
[m_movieWriter cancelRecording];
七、视频滤镜
7.1、一个滤镜
//添加滤镜
m_customFilter = [[GPUImageFilter alloc] init];
[m_videoCamera addTarget:m_customFilter];
[m_customFilter addTarget:m_filteredVideoView];
[m_customFilter addTarget:m_movieWriter];
7.2、多个滤镜
多个滤镜需要使用滤镜组
//漫画
GPUImageSketchFilter *disFilter = [[GPUImageSketchFilter alloc] init];
//褐色
GPUImageSepiaFilter* sepiaFilter = [[GPUImageSepiaFilter alloc] init];
filterGroup = [[GPUImageFilterGroup alloc] init];
[filterGroup addFilter:disFilter];
[filterGroup addFilter:sepiaFilter];
//先后顺序
[disFilter addTarget:sepiaFilter];
//开始的滤镜
[filterGroup setInitialFilters:[NSArray arrayWithObject:disFilter]];
[filterGroup setTerminalFilter:sepiaFilter];
[filterGroup addTarget:m_filteredVideoView];
[m_videoCamera addTarget:filterGroup];
[filterGroup addTarget:m_movieWriter];
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GPUImage录像的一些备忘
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