private AVCaptureDeviceFormat SelectFormatForDevice(AVCaptureDevice device, int targetWidth, int targetHeight)
{
var formats = RTCCameraVideoCapturer.SupportedFormatsForDevice(device);
AVCaptureDeviceFormat selectedFormat = null;
var currentDiff = int.MaxValue;
foreach (var format in formats)
{
if (!(format.FormatDescription is CMVideoFormatDescription videoFormatDescription))
{
continue;
}
var dimension = videoFormatDescription.Dimensions;
var pixelFormat = videoFormatDescription.MediaSubType;
var diff = Math.Abs(targetWidth - dimension.Width) + Math.Abs(targetHeight - dimension.Height);
if (diff < currentDiff)
{
selectedFormat = format;
currentDiff = diff;
}
else if (diff == currentDiff && pixelFormat == _capturer.PreferredOutputPixelFormat)
{
selectedFormat = format;
}
}
return(selectedFormat);
}
private static int SelectFpsForFormat(AVCaptureDeviceFormat format)
{
var maxSupportedFramerate = format.VideoSupportedFrameRateRanges.Select(fpsRange => fpsRange.MaxFrameRate)
.Prepend(0d).Max();
return((int)Math.Min(maxSupportedFramerate, FramerateLimit));
}
private int SelectFpsForFormat(AVCaptureDeviceFormat format)
{
var maxSupportedFramerate = 0d;
foreach (var fpsRange in format.VideoSupportedFrameRateRanges)
{
maxSupportedFramerate = Math.Max(maxSupportedFramerate, fpsRange.MaxFrameRate);
}
return((int)Math.Min(maxSupportedFramerate, kFramerateLimit));
}
private int GetFpsByFormat(AVCaptureDeviceFormat format)
{
var maxSupportedFps = 0d;
foreach (var fpsRange in format.VideoSupportedFrameRateRanges)
{
maxSupportedFps = Math.Max(maxSupportedFps, fpsRange.MaxFrameRate);
}
return((int)Math.Min(maxSupportedFps, _frameRateLimit));
}
private void StartCameraWithCompletionHandler(Action <bool, NSError> completion)
{
captureSession = new AVCaptureSession();
captureSession.BeginConfiguration();
captureDevice = CameraDeviceForPosition(AVCaptureDevicePosition.Back);
if (captureDevice == null)
{
string message = "Error message back camera - not found";
string title = "Error title back camera - not found";
ShowErrorMessage(message, title);
return;
}
NSError error;
AVCaptureDeviceInput deviceInput = AVCaptureDeviceInput.FromDevice(captureDevice, out error);
if (deviceInput == null)
{
Console.WriteLine("This error should be handled appropriately in your app -- obtain device input: {0}", error);
string message = "Error message back camera - can't open.";
string title = "Error title for back camera - can't open.";
ShowErrorMessage(message, title);
return;
}
captureSession.AddInput(deviceInput);
stillImageOutput = new AVCaptureStillImageOutput();
//Or instead of JPEG, we can use one of the following pixel formats: BGRA, 420f output
stillImageOutput.OutputSettings = NSDictionary.FromObjectAndKey(AVVideo.CodecJPEG, AVVideo.CodecKey);
captureSession.AddOutput(stillImageOutput);
cameraPreviewView.ConfigureCaptureSession(captureSession, stillImageOutput);
captureSession.SessionPreset = AVCaptureSession.PresetPhoto;
captureDeviceFormat = captureDevice.ActiveFormat;
captureSession.CommitConfiguration();
captureSession.StartRunning();
maxBracketCount = stillImageOutput.MaxBracketedCaptureStillImageCount;
PrepareBracketsWithCompletionHandler(completion);
}
private void StartCameraWithCompletionHandler(Action<bool, NSError> completion)
{
captureSession = new AVCaptureSession ();
captureSession.BeginConfiguration ();
captureDevice = CameraDeviceForPosition (AVCaptureDevicePosition.Back);
if (captureDevice == null) {
string message = "Error message back camera - not found";
string title = "Error";
ShowErrorMessage (message, title);
return;
}
NSError error;
AVCaptureDeviceInput deviceInput = AVCaptureDeviceInput.FromDevice (captureDevice, out error);
if (deviceInput == null) {
Console.WriteLine ("This error should be handled appropriately in your app -- obtain device input: {0}", error);
string message = "Error message back camera - can't open.";
string title = "Error";
ShowErrorMessage (message, title);
return;
}
captureSession.AddInput (deviceInput);
stillImageOutput = new AVCaptureStillImageOutput ();
//Or instead of JPEG, we can use one of the following pixel formats: BGRA, 420f output
stillImageOutput.OutputSettings = new NSDictionary (AVVideo.CodecKey, AVVideo.CodecJPEG);
captureSession.AddOutput (stillImageOutput);
cameraPreviewView.ConfigureCaptureSession (captureSession, stillImageOutput);
captureSession.SessionPreset = AVCaptureSession.PresetPhoto;
captureDeviceFormat = captureDevice.ActiveFormat;
captureSession.CommitConfiguration ();
captureSession.StartRunning ();
maxBracketCount = stillImageOutput.MaxBracketedCaptureStillImageCount;
PrepareBracketsWithCompletionHandler (completion);
}
