如何解决播放用 AVCaptureAudioDataOutput 录制的音频
我正在尝试录制视频和音频并通过网络发送它们,以便它们可以在其他客户端上实时播放。我已成功录制和播放视频,但仍然无法播放音频(请参阅下面代码底部的 AVAudioPlayer)。我做错了什么或缺少什么? (还有其他几个 StackOverflow 问题似乎解决了同样的问题,但即使那里的评论表明有些人能够使其工作,但没有一个给出明确的、有效的答案。)在此先感谢您任何输入。
let captureSession = AVCaptureSession()
private func startVideoFeed() {
let sessionPreset = AVCaptureSession.Preset.low
if captureSession.canSetSessionPreset(sessionPreset) {
captureSession.sessionPreset = sessionPreset
}
switch AVCaptureDevice.authorizationStatus(for: .video) {
case .notDetermined:
AVCaptureDevice.requestAccess(for: .video) { success in
self.startVideoFeed()
}
case .authorized:
captureSession.beginConfiguration()
let captureVideoDevice = AVCaptureDevice.default(.builtInWideAngleCamera,for: .video,position: .front)!
let captureVideoInput = try! AVCaptureDeviceInput(device: captureVideoDevice)
if captureSession.canAddInput(captureVideoInput) {
captureSession.addInput(captureVideoInput)
}
let captureVideoOutput = AVCaptureVideoDataOutput()
captureVideoOutput.setSampleBufferDelegate(self,queue: dispatchQueue.main)
if captureSession.canAddOutput(captureVideoOutput) {
captureSession.addOutput(captureVideoOutput)
}
captureSession.commitConfiguration()
captureSession.startRunning()
default:
break
}
}
private func startAudioFeed() {
switch AVCaptureDevice.authorizationStatus(for: .audio) {
case .notDetermined:
AVCaptureDevice.requestAccess(for: .audio) { success in
self.startAudioFeed()
}
case .authorized:
captureSession.beginConfiguration()
let captureAudioDevice = AVCaptureDevice.default(for: .audio)!
let captureAudioInput = try! AVCaptureDeviceInput(device: captureAudioDevice)
if captureSession.canAddInput(captureAudioInput) {
captureSession.addInput(captureAudioInput)
}
let captureAudioOutput = AVCaptureAudioDataOutput()
captureAudioOutput.audioSettings = [AVFormatIDKey: kAudioFormatLinearPCM,AVNumberOfChannelsKey: NSNumber(value: 1),AVSampleRateKey: NSNumber(value: 44100)]
captureAudioOutput.setSampleBufferDelegate(self,queue: dispatchQueue.main)
if captureSession.canAddOutput(captureAudioOutput) {
captureSession.addOutput(captureAudioOutput)
}
captureSession.commitConfiguration()
default:
break
}
}
func captureOutput(_ output: AVCaptureOutput,didOutput sampleBuffer: CMSampleBuffer,from connection: AVCaptureConnection) {
if let imageBuffer = sampleBuffer.imageBuffer {
let ciImage = CIImage(cvPixelBuffer: imageBuffer)
let cgImage = CIContext().createCGImage(ciImage,from: ciImage.extent)!
let data = CFDataCreateMutable(nil,0)!
let imageDestination = CGImageDestinationCreateWithData(data,kUTTypeJPEG,1,nil)!
CGImageDestinationAddImage(imageDestination,cgImage,[kCGImageDestinationLossyCompressionQuality: NSNumber(value: 0)] as CFDictionary)
CGImageDestinationFinalize(imageDestination)
play(data: data as Data)
} else if let dataBuffer = sampleBuffer.dataBuffer {
let data = try! dataBuffer.dataBytes()
play(data: data)
}
}
private func play(data: Data) {
if let image = CGImage(jpegDataProviderSource: CGDataProvider(data: data as CFData)!,decode: nil,shouldInterpolate: false,intent: .defaultIntent) {
// image is a valid image
} else if let audioPlayer = try? AVAudioPlayer(data: data) {
audioPlayer.play()
// audioPlayer is always nil with error: Error Domain=NSOsstatusErrorDomain Code=1954115647 "(null)"
}
}
解决方法
https://developer.apple.com/documentation/coremedia/1489629-cmsamplebuffergetdatabuffer
调用者不拥有返回的 dataBuffer,如果调用者需要维护对它的引用,则必须显式保留它。
您需要对数据执行 CFRetain 和 CFRelease。
播放器为零,因为您使用的数据对其进行了初始化。 Convert sampleBuffer to Data。
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