bool SetupCaptureSession()
{
Console.WriteLine("SetupCaptureSession");
// Overview: RosyWriter uses separate GCD queues for audio and video capture. If a single GCD queue
// is used to deliver both audio and video buffers, and our video processing consistently takes
// too long, the delivery queue can back up, resulting in audio being dropped.
//
// When recording, RosyWriter creates a third GCD queue for calls to AVAssetWriter. This ensures
// that AVAssetWriter is not called to start or finish writing from multiple threads simultaneously.
//
// RosyWriter uses AVCaptureSession's default preset, AVCaptureSessionPresetHigh.
// Create Capture session
captureSession = new AVCaptureSession();
captureSession.BeginConfiguration();
// Create audio connection
NSError error;
var audioDevice = AVCaptureDevice.DefaultDeviceWithMediaType(AVMediaType.Audio); //AudioDevice ();
if (audioDevice == null)
{
return(false); // e.g. simulator
}
AVCaptureDeviceInput audioIn = new AVCaptureDeviceInput(audioDevice, out error);
if (captureSession.CanAddInput(audioIn))
{
captureSession.AddInput(audioIn);
}
AVCaptureAudioDataOutput audioOut = new AVCaptureAudioDataOutput();
// Add the Delegate to capture each sample that comes through
audioOut.SetSampleBufferDelegatequeue(audioDataOutputDelegate, movieWritingQueue);
if (captureSession.CanAddOutput(audioOut))
{
captureSession.AddOutput(audioOut);
}
// Create Video Session
var videoDevice = AVCaptureDevice.DefaultDeviceWithMediaType(AVMediaType.Video); //VideoDeviceWithPosition (AVCaptureDevicePosition.Back);
AVCaptureDeviceInput videoIn = new AVCaptureDeviceInput(videoDevice, out error);
if (captureSession.CanAddInput(videoIn))
{
captureSession.AddInput(videoIn);
}
// RosyWriter prefers to discard late video frames early in the capture pipeline, since its
// processing can take longer than real-time on some platforms (such as iPhone 3GS).
// Clients whose image processing is faster than real-time should consider setting AVCaptureVideoDataOutput's
// alwaysDiscardsLateVideoFrames property to NO.
AVCaptureVideoDataOutput videoOut = new AVCaptureVideoDataOutput()
{
AlwaysDiscardsLateVideoFrames = true,
VideoSettings = new AVVideoSettings(CVPixelFormatType.CV32BGRA)
};
// Create a DispatchQueue for the Video Processing
DispatchQueue videoCaptureQueue = new DispatchQueue("Video Capture Queue");
videoOut.SetSampleBufferDelegateAndQueue(videoDataOutputDelegate, videoCaptureQueue);
if (captureSession.CanAddOutput(videoOut))
{
captureSession.AddOutput(videoOut);
}
// Set the Video connection from the Video Output object
videoConnection = videoOut.ConnectionFromMediaType(AVMediaType.Video);
videoOrientation = videoConnection.VideoOrientation;
captureSession.CommitConfiguration();
return(true);
}
bool SetupCaptureSession ()
{
Console.WriteLine ("SetupCaptureSession");
// Overview: RosyWriter uses separate GCD queues for audio and video capture. If a single GCD queue
// is used to deliver both audio and video buffers, and our video processing consistently takes
// too long, the delivery queue can back up, resulting in audio being dropped.
//
// When recording, RosyWriter creates a third GCD queue for calls to AVAssetWriter. This ensures
// that AVAssetWriter is not called to start or finish writing from multiple threads simultaneously.
//
// RosyWriter uses AVCaptureSession's default preset, AVCaptureSessionPresetHigh.
// Create Capture session
captureSession = new AVCaptureSession ();
captureSession.BeginConfiguration ();
// Create audio connection
NSError error;
var audioDevice = AVCaptureDevice.DefaultDeviceWithMediaType (AVMediaType.Audio); //AudioDevice ();
if (audioDevice == null)
return false; // e.g. simulator
AVCaptureDeviceInput audioIn = new AVCaptureDeviceInput (audioDevice, out error);
if (captureSession.CanAddInput (audioIn))
captureSession.AddInput (audioIn);
AVCaptureAudioDataOutput audioOut = new AVCaptureAudioDataOutput ();
// Add the Delegate to capture each sample that comes through
audioOut.SetSampleBufferDelegatequeue (audioDataOutputDelegate, movieWritingQueue);
if (captureSession.CanAddOutput (audioOut))
captureSession.AddOutput (audioOut);
// Create Video Session
var videoDevice = AVCaptureDevice.DefaultDeviceWithMediaType (AVMediaType.Video); //VideoDeviceWithPosition (AVCaptureDevicePosition.Back);
AVCaptureDeviceInput videoIn = new AVCaptureDeviceInput (videoDevice, out error);
if (captureSession.CanAddInput (videoIn))
captureSession.AddInput (videoIn);
// RosyWriter prefers to discard late video frames early in the capture pipeline, since its
// processing can take longer than real-time on some platforms (such as iPhone 3GS).
// Clients whose image processing is faster than real-time should consider setting AVCaptureVideoDataOutput's
// alwaysDiscardsLateVideoFrames property to NO.
AVCaptureVideoDataOutput videoOut = new AVCaptureVideoDataOutput (){
AlwaysDiscardsLateVideoFrames = true,
VideoSettings = new AVVideoSettings (CVPixelFormatType.CV32BGRA)
};
// Create a DispatchQueue for the Video Processing
DispatchQueue videoCaptureQueue = new DispatchQueue ("Video Capture Queue");
videoOut.SetSampleBufferDelegateAndQueue (videoDataOutputDelegate, videoCaptureQueue);
if (captureSession.CanAddOutput (videoOut))
captureSession.AddOutput (videoOut);
// Set the Video connection from the Video Output object
videoConnection = videoOut.ConnectionFromMediaType (AVMediaType.Video);
videoOrientation = videoConnection.VideoOrientation;
captureSession.CommitConfiguration ();
return true;
}
