public void StartCapture(int videoWidth, int videoHeight, int fps)
{
_fps = fps;
_videoWidth = videoWidth;
_videoHeight = videoHeight;
var position = _usingFrontCamera ? AVCaptureDevicePosition.Back : AVCaptureDevicePosition.Front;
var device = FindDeviceForPosition(position);
var format = SelectFormatForDevice(device, videoWidth, videoHeight);
if (format == null)
{
Debug.WriteLine($"CameraVideoCapturerNative -> didn't find a valid format for {device}");
format = RTCCameraVideoCapturer.SupportedFormatsForDevice(device).FirstOrDefault();
}
if (format == null)
{
Console.WriteLine("CameraVideoCapturerNative -> no valid formats for device {0}", device);
return;
}
fps = SelectFpsForFormat(format);
_capturer.StartCaptureWithDevice(device, format, fps);
}
private AVCaptureDeviceFormat SelectFormatForDevice(AVCaptureDevice device, int targetWidth, int targetHeight)
{
var formats = RTCCameraVideoCapturer.SupportedFormatsForDevice(device);
AVCaptureDeviceFormat selectedFormat = null;
var currentDiff = int.MaxValue;
foreach (var format in formats)
{
if (!(format.FormatDescription is CMVideoFormatDescription videoFormatDescription))
{
continue;
}
var dimension = videoFormatDescription.Dimensions;
var pixelFormat = videoFormatDescription.MediaSubType;
var diff = Math.Abs(targetWidth - dimension.Width) + Math.Abs(targetHeight - dimension.Height);
if (diff < currentDiff)
{
selectedFormat = format;
currentDiff = diff;
}
else if (diff == currentDiff && pixelFormat == _capturer.PreferredOutputPixelFormat)
{
selectedFormat = format;
}
}
return(selectedFormat);
}
public void StartCapture(int videoWidth, int videoHeight, int fps)
{
_videoFps = fps;
_videoHeight = videoHeight;
_videoWidth = videoWidth;
var position = _usingFrontCamera ? AVCaptureDevicePosition.Back : AVCaptureDevicePosition.Front;
var device = GetDeviceByPosition(position);
var format = GetFormatForDevice(device, videoWidth, videoHeight);
if (format == null)
{
Debug.WriteLine($"PLATFORMCAMERAVIDEOCAPTURER: not valid format for {device}");
format = RTCCameraVideoCapturer.SupportedFormatsForDevice(device).FirstOrDefault();
if (format == null)
{
Debug.WriteLine($"PLATFORMCAMERAVIDEOCAPTURER: no valid formats for device {0} and {device}");
return;
}
fps = GetFpsByFormat(format);
_cameraVideoCapturer.StartCaptureWithDevice(device, format, fps);
}
}