在Swift中创建CMSampleBuffer的副本将返回OSStatus -12743(无效的媒体格式) [英] Creating copy of CMSampleBuffer in Swift returns OSStatus -12743 (Invalid Media Format)

问题描述

我正在尝试执行CMSampleBuffer的深层克隆以存储AVCaptureSession的输出.运行函数CMSampleBufferCreateForImageBuffer时收到错误kCMSampleBufferError_InvalidMediaFormat (OSStatus -12743).我看不到如何错配CVImageBuffer和CMSampleBuffer格式说明.有人知道我哪里出问题了吗?她是我的测试代码.

I am attempting to perform a deep clone of CMSampleBuffer to store the output of a AVCaptureSession. I am receiving the error kCMSampleBufferError_InvalidMediaFormat (OSStatus -12743) when I run the function CMSampleBufferCreateForImageBuffer. I don't see how I've mismatched the CVImageBuffer and the CMSampleBuffer format description. Anyone know where I've gone wrong? Her is my test code.

func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!) {

    let allocator: CFAllocator = CFAllocatorGetDefault().takeRetainedValue()

    func cloneImageBuffer(imageBuffer: CVImageBuffer!) -> CVImageBuffer? {
        CVPixelBufferLockBaseAddress(imageBuffer, 0)
        let bytesPerRow: size_t = CVPixelBufferGetBytesPerRow(imageBuffer)
        let width: size_t = CVPixelBufferGetWidth(imageBuffer)
        let height: size_t = CVPixelBufferGetHeight(imageBuffer)
        let baseAddress = CVPixelBufferGetBaseAddress(imageBuffer)
        let pixelFormatType = CVPixelBufferGetPixelFormatType(imageBuffer)

        let data = NSMutableData(bytes: baseAddress, length: bytesPerRow * height)
        CVPixelBufferUnlockBaseAddress(imageBuffer, 0)

        var clonedImageBuffer: CVPixelBuffer?
        let refCon = NSMutableData()

        if CVPixelBufferCreateWithBytes(allocator, width, height, pixelFormatType, data.mutableBytes, bytesPerRow, nil, refCon.mutableBytes, nil, &clonedImageBuffer) == noErr {
            return clonedImageBuffer
        } else {
            return nil
        }
    }

    if let oldImageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) {
        if let newImageBuffer = cloneImageBuffer(oldImageBuffer) {
            if let formatDescription = CMSampleBufferGetFormatDescription(sampleBuffer) {
                let dataIsReady = CMSampleBufferDataIsReady(sampleBuffer)
                let refCon = NSMutableData()
                var timingInfo: CMSampleTimingInfo = kCMTimingInfoInvalid
                let timingInfoSuccess = CMSampleBufferGetSampleTimingInfo(sampleBuffer, 0, &timingInfo)
                if timingInfoSuccess == noErr {
                    var newSampleBuffer: CMSampleBuffer?
                    let success = CMSampleBufferCreateForImageBuffer(allocator, newImageBuffer, dataIsReady, nil, refCon.mutableBytes, formatDescription, &timingInfo, &newSampleBuffer)
                    if success == noErr {
                        bufferArray.append(newSampleBuffer!)
                    } else {
                        NSLog("Failed to create new image buffer. Error: \(success)")
                    }
                } else {
                    NSLog("Failed to get timing info. Error: \(timingInfoSuccess)")
                }
            }
        }
    }
}

推荐答案

我能够通过在新创建的图像缓冲区之外创建格式说明，并使用它代替原始样本缓冲区中的格式说明来解决此问题.不幸的是，虽然这里解决了问题，但格式说明不匹配，导致问题进一步恶化.

I was able to fix the problem by creating a format description off the newly created image buffer and using it instead of the format description off the original sample buffer. Unfortunately while that fixes the problem here, the format descriptions don't match and causes problem further down.

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