所以你想要同时从用户的库中录制视频和播放音乐?不用再找了,下面就是答案。
所以你想要同时从用户的库中录制视频和播放音乐?不用再找了,下面就是答案。
对于音频播放,您将使用AVAudioPlayer
。您所要做的就是将AVAudioPlayer
声明为全局变量(我将其命名为audioPlayer)并实现以下代码。
在用户选择要播放的歌曲后,使用以下代码:
func mediaPicker(mediaPicker: MPMediaPickerController, didPickMediaItems mediaItemCollection: MPMediaItemCollection) {
let pickerItem: MPMediaItem = mediaItemCollection.items[0]
let songURL = pickerItem.valueForProperty(MPMediaItemPropertyAssetURL)
if let sURL = songURL as? NSURL
{
songTitle = pickerItem.title!
do
{
audioPlayer = try AVAudioPlayer(contentsOfURL: sURL)
}
catch
{
print("Can't Create Audio Player: \(error)")
}
}
dismissViewControllerAnimated(true, completion: { () -> Void in
audioPlayer.play()
})
}
您还需要在viewDidLoad
中设置音频会话。如果您希望录制时播放音频,这非常重要:
// Audio Session Setup
do
{
try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
}
catch
{
print("Can't Set Audio Session Category: \(error)")
}
AVAudioSessionCategoryOptions.MixWithOthers
do
{
try audioSession.setMode(AVAudioSessionModeVideoRecording)
}
catch
{
print("Can't Set Audio Session Mode: \(error)")
}
// Start Session
do
{
try audioSession.setActive(true)
}
catch
{
print("Can't Start Audio Session: \(error)")
}
let captureSession = AVCaptureSession()
var currentDevice: AVCaptureDevice?
var videoFileOutput: AVCaptureMovieFileOutput?
var cameraPreviewLayer: AVCaptureVideoPreviewLayer?
然后在viewDidLoad
中配置会话。注意:视频预览在容器中,整个视频相关的代码在另一个视图控制器中,但只使用视图而不是容器也可以正常工作:
// Preset For 720p
captureSession.sessionPreset = AVCaptureSessionPreset1280x720
// Get Available Devices Capable Of Recording Video
let devices = AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo) as! [AVCaptureDevice]
// Get Back Camera
for device in devices
{
if device.position == AVCaptureDevicePosition.Back
{
currentDevice = device
}
}
let camera = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
// Audio Input
let audioInputDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeAudio)
do
{
let audioInput = try AVCaptureDeviceInput(device: audioInputDevice)
// Add Audio Input
if captureSession.canAddInput(audioInput)
{
captureSession.addInput(audioInput)
}
else
{
NSLog("Can't Add Audio Input")
}
}
catch let error
{
NSLog("Error Getting Input Device: \(error)")
}
// Video Input
let videoInput: AVCaptureDeviceInput
do
{
videoInput = try AVCaptureDeviceInput(device: camera)
// Add Video Input
if captureSession.canAddInput(videoInput)
{
captureSession.addInput(videoInput)
}
else
{
NSLog("ERROR: Can't add video input")
}
}
catch let error
{
NSLog("ERROR: Getting input device: \(error)")
}
// Video Output
videoFileOutput = AVCaptureMovieFileOutput()
captureSession.addOutput(videoFileOutput)
// Show Camera Preview
cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
view.layer.addSublayer(cameraPreviewLayer!)
cameraPreviewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
let width = view.bounds.width
cameraPreviewLayer?.frame = CGRectMake(0, 0, width, width)
// Bring Record Button To Front & Start Session
view.bringSubviewToFront(recordButton)
captureSession.startRunning()
print(captureSession.inputs)
然后您创建一个@IBAction
,用于处理用户按下记录按钮时的操作(我只是使用了一个简单的按钮,将其制成了红色和圆形):
@IBAction func capture(sender: AnyObject) {
do
{
initialOutputURL = try NSFileManager.defaultManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true).URLByAppendingPathComponent("output").URLByAppendingPathExtension("mov")
}
catch
{
print(error)
}
if !isRecording
{
isRecording = true
UIView.animateWithDuration(0.5, delay: 0.0, options: [.Repeat, .Autoreverse, .AllowUserInteraction], animations: { () -> Void in
self.recordButton.transform = CGAffineTransformMakeScale(0.75, 0.75)
}, completion: nil)
videoFileOutput?.startRecordingToOutputFileURL(initialOutputURL, recordingDelegate: self)
}
else
{
isRecording = false
UIView.animateWithDuration(0.5, delay: 0, options: [], animations: { () -> Void in
self.recordButton.transform = CGAffineTransformMakeScale(1.0, 1.0)
}, completion: nil)
recordButton.layer.removeAllAnimations()
videoFileOutput?.stopRecording()
}
}
接着,你只需要将视频保存到(很可能是)相机胶卷中即可。但我不会包含此部分内容。您必须自己付出一些努力。(提示:UISaveVideoAtPathToSavedPhotosAlbum
)
这就是使用AVFoundation
同时录制视频和从库中播放音乐的方法。
一旦您像下面这样设置了AVAudioSession,它就会正常工作。
try? AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playAndRecord, mode: AVAudioSession.Mode.videoRecording, options: AVAudioSession.CategoryOptions.mixWithOthers)