用增强现实录制视频的最佳方法是什么?(向iPhone / iPad相机的框架添加文字,图像徽标)
以前,我试图弄清楚如何绘制CIImage并转换CIImage回CMSampleBufferCIImage回到CMSampleBuffer中 我几乎做了所有事情,只是在使用new CMSampleBufferin 录制视频时遇到问题AVAssetWriterInput
CIImage
CMSampleBuffer
AVAssetWriterInput
但是,无论如何,这种解决方案都不是很好,它在转换CIImage为CVPixelBuffer(ciContext.render(ciImage!,to: aBuffer))时会占用大量CPU
CVPixelBuffer
ciContext.render(ciImage!,to: aBuffer)
因此,我想在这里停下来,找到其他方法来录制具有增强现实的视频(例如,在将视频编码为mp4文件的同时,在帧内动态添加(绘制)文本)
在这里,我已经尝试过并且不想再使用了…
// convert original CMSampleBuffer to CIImage, // combine multiple `CIImage`s into one (adding augmented reality - // text or some additional images) let pixelBuffer: CVPixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)! let ciimage : CIImage = CIImage(cvPixelBuffer: pixelBuffer) var outputImage: CIImage? let images : Array<CIImage> = [ciimage, ciimageSec!] // add all your CIImages that you'd like to combine for image in images { outputImage = outputImage == nil ? image : image.composited(over: outputImage!) } // allocate this class variable once if pixelBufferNew == nil { CVPixelBufferCreate(kCFAllocatorSystemDefault, CVPixelBufferGetWidth(pixelBuffer), CVPixelBufferGetHeight(pixelBuffer), kCVPixelFormatType_32BGRA, nil, &pixelBufferNew) } // convert CIImage to CVPixelBuffer let ciContext = CIContext(options: nil) if let aBuffer = pixelBufferNew { ciContext.render(outputImage!, to: aBuffer) // >>> IT EATS A LOT OF <<< CPU } // convert new CVPixelBuffer to new CMSampleBuffer var sampleTime = CMSampleTimingInfo() sampleTime.duration = CMSampleBufferGetDuration(sampleBuffer) sampleTime.presentationTimeStamp = CMSampleBufferGetPresentationTimeStamp(sampleBuffer) sampleTime.decodeTimeStamp = CMSampleBufferGetDecodeTimeStamp(sampleBuffer) var videoInfo: CMVideoFormatDescription? = nil CMVideoFormatDescriptionCreateForImageBuffer(kCFAllocatorDefault, pixelBufferNew!, &videoInfo) var oBuf: CMSampleBuffer? CMSampleBufferCreateForImageBuffer(kCFAllocatorDefault, pixelBufferNew!, true, nil, nil, videoInfo!, &sampleTime, &oBuf) /* try to append new CMSampleBuffer into a file (.mp4) using AVAssetWriter & AVAssetWriterInput... (I met errors with it, original buffer works ok - "from func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection)") */*
有没有更好的解决方案?
现在我回答我自己的问题
最好是使用Objective-C++类(.mm),我们可以使用OpenCV的和容易/快速转换CMSampleBuffer到cv::Mat和回CMSampleBuffer处理后
Objective-C++
.mm
cv::Mat
我们可以轻松地从Swift调用Objective-C ++函数