从CVPixelBuffer创建CMSampleBuffer

问题描述

我从ARSessionDelegate获得了一个CVPixelBuffer:

I get a CVPixelBuffer from ARSessionDelegate:

func session(_ session: ARSession, didUpdate frame: ARFrame) {
    frame.capturedImage // CVPixelBufferRef
}

但是我的应用程序的另一部分(我无法更改)使用CMSampleBuffer.

But another part of my app (that I can't change) uses a CMSampleBuffer.

CMSampleBuffer是CVPixelBuffer的容器.

CMSampleBuffer is a container of CVPixelBuffer.

为了创建CMSampleBuffer，我可以使用以下功能:

In order to create a CMSampleBuffer I can use this function:

func CMSampleBufferCreateReadyWithImageBuffer(_ allocator: CFAllocator?,
                                            _ imageBuffer: CVImageBuffer,
                                            _ formatDescription: CMVideoFormatDescription,
                                            _ sampleTiming: UnsafePointer<CMSampleTimingInfo>,
                                            _ sBufOut: UnsafeMutablePointer<CMSampleBuffer?>) -> OSStatus

我唯一缺少的参数是sampleTiming-如何从CVPixelBuffer中提取该参数?

The only missing parameter for me is sampleTiming - how can I extract that from CVPixelBuffer?

推荐答案

sampleTiming主要包含presentationTimeStamp，您可以通过以下代码轻松创建它:

The sampleTiming mainly contains the presentationTimeStamp, You can easy create it by following codes:

let scale = CMTimeScale(NSEC_PER_SEC)
let pts = CMTime(value: CMTimeValue(frame.timestamp * Double(scale)),
                 timescale: scale)
var timingInfo = CMSampleTimingInfo(duration: kCMTimeInvalid,
                                    presentationTimeStamp: pts,
                                    decodeTimeStamp: kCMTimeInvalid)

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