使用增强现实技术录制视频的最佳方式是什么?(在iPhone/iPad摄像头的框架中添加文字、图像和徽标)
之前我想知道如何
CIImage
(
How to draw text into CIImage?
)和转换
CIImage公司
返回到
CMSampleBuffer
(
CIImage back to CMSampleBuffer
)
我几乎什么都做了,只是用新的
CMSampleBuffer
在里面
AVAssetWriterInput
但这个解决方案无论如何都不好,它在转换时会消耗大量CPU
CIImage公司
到
CVPixelBuffer
(
ciContext.render(ciImage!, to: aBuffer)
)
因此,我想停在这里,找到一些其他方法来录制具有增强现实功能的视频(例如,在将视频编码到mp4文件时,在帧内动态添加(绘制)文本)
这里是我已经尝试过的,不想再使用的。。。
// 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?
