的过程如下:
- 首先,导入AVFoundation框架,以便使用相关的类和方法。import AVFoundation
- 创建一个AVCaptureSession对象,并配置输入和输出。let captureSession = AVCaptureSession()
// 配置输入
guard let captureDevice = AVCaptureDevice.default(for: .video),
let captureInput = try? AVCaptureDeviceInput(device: captureDevice),
captureSession.canAddInput(captureInput) else {
// 处理无法获取摄像头输入的情况
return
}
captureSession.addInput(captureInput)
// 配置输出
let captureOutput = AVCaptureVideoDataOutput()
captureOutput.videoSettings = [kCVPixelBufferPixelFormatTypeKey as String: kCVPixelFormatType_32BGRA]
captureOutput.setSampleBufferDelegate(self, queue: DispatchQueue.main)
guard captureSession.canAddOutput(captureOutput) else {
// 处理无法添加输出的情况
return
}
captureSession.addOutput(captureOutput)
- 创建一个AVAssetWriter对象,并设置输出路径和文件格式。let outputURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("output.mov")
guard let assetWriter = try? AVAssetWriter(outputURL: outputURL, fileType: .mov) else {
// 处理无法创建AVAssetWriter对象的情况
return
}
- 创建一个AVAssetWriterInput对象,并将其添加到AVAssetWriter中。let outputSettings = [
AVVideoCodecKey: AVVideoCodecType.h264,
AVVideoWidthKey: 1280,
AVVideoHeightKey: 720
] as [String : Any]
let assetWriterInput = AVAssetWriterInput(mediaType: .video, outputSettings: outputSettings)
guard assetWriter.canAdd(assetWriterInput) else {
// 处理无法添加AVAssetWriterInput对象的情况
return
}
assetWriter.add(assetWriterInput)
- 开始AVCaptureSession,并在每次输出回调中将样本缓冲区写入AVAssetWriterInput。captureSession.startRunning()
func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
guard assetWriter.status == .writing else {
// 处理AVAssetWriter状态不是writing的情况
return
}
if assetWriterInput.isReadyForMoreMediaData {
assetWriterInput.append(sampleBuffer)
}
}
- 结束录制并完成写入操作。captureSession.stopRunning()
assetWriterInput.markAsFinished()
assetWriter.finishWriting {
// 处理写入完成后的操作,例如保存文件到相册
}
这是一个基本的使用AVAssetWriter将AVCaptureVideoDataOutput保存为电影文件的过程。在实际应用中,还可以根据需求进行更多的配置和处理,例如添加音频输入、设置视频压缩参数等。腾讯云提供了一系列与音视频处理相关的产品和服务,例如云点播(https://cloud.tencent.com/product/vod)和云直播(https://cloud.tencent.com/product/live),可以根据具体需求选择适合的产品进行集成和开发。