public override void OutputVideoFrame(CVImageBuffer videoFrame, QTSampleBuffer sampleBuffer, QTCaptureConnection connection)
{
if (videoFrame == null) {
throw new ArgumentNullException ("videoFrame");
}
if (sampleBuffer == null) {
throw new ArgumentNullException ("sampleBuffer");
}
if (connection == null) {
throw new ArgumentNullException ("connection");
}
if (!capture) {
videoFrame.Dispose ();
sampleBuffer.Dispose ();
return;
}
Console.WriteLine("Capturing photo");
capture = false;
try
{
var imagePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments),
"captured_image.tiff");
var image = CIImage.FromImageBuffer(videoFrame);
var imageRep = new NSBitmapImageRep(image);
var tiffImage = imageRep.TiffRepresentation;
var bytes = new byte[tiffImage.Length];
Marshal.Copy(tiffImage.Bytes, bytes, 0, (int)tiffImage.Length);
File.WriteAllBytes(imagePath, bytes);
// NSError error;
// tiffImage.Save(imagePath, MonoMac.Foundation.NSDataWritingOptions.FileProtectionNone, out error);
Console.WriteLine("Wrote image: '{0}'", imagePath);
tiffImage.Dispose();
imageRep.Dispose();
videoFrame.Dispose();
sampleBuffer.Dispose();
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
}
void UpdateAudioLevels(NSTimer timer)
{
// Get the mean audio level from the movie file output's audio connections
float totalDecibels = 0f;
QTCaptureConnection connection = null;
int i = 0;
int numberOfPowerLevels = 0; // Keep track of the total number of power levels in order to take the mean
// TODO: https://bugzilla.xamarin.com/show_bug.cgi?id=27702
IntPtr library = Dlfcn.dlopen("/System/Library/Frameworks/QTKit.framework/QTKit", 0);
NSString soundType = Dlfcn.GetStringConstant(library, "QTMediaTypeSound");
var connections = movieFileOutput.Connections;
for (i = 0; i < connections.Length; i++)
{
connection = connections [i];
if (connection.MediaType == soundType)
{
// TODO: https://bugzilla.xamarin.com/show_bug.cgi?id=27708 Use typed property
NSArray powerLevelsNative = (NSArray)connection.GetAttribute(QTCaptureConnection.AudioAveragePowerLevelsAttribute);
NSNumber[] powerLevels = NSArray.FromArray <NSNumber> (powerLevelsNative);
int j = 0;
int powerLevelCount = powerLevels.Length;
for (j = 0; j < powerLevelCount; j++)
{
totalDecibels += powerLevels [j].FloatValue;
numberOfPowerLevels++;
}
}
}
if (numberOfPowerLevels > 0)
{
audioLevelIndicator.FloatValue = 20 * (float)Math.Pow(10, 0.05 * (totalDecibels / numberOfPowerLevels));
}
else
{
audioLevelIndicator.FloatValue = 0;
}
}
bool ShouldChangeOutputFile (QTCaptureFileOutput captureOutput, NSUrl outputFileURL, QTCaptureConnection[] connections, NSError reason)
{
// Should change the file on error
Console.WriteLine (reason.LocalizedDescription);
return false;
}
