public override void ViewDidLoad()
{
base.ViewDidLoad();
var sampleURL = NSBundle.MainBundle.GetUrlForResource("sample_iPod", "m4v");
var movieFile = new GPUImageMovie(sampleURL);
movieFile.RunBenchmark = true;
movieFile.PlayAtActualSpeed = false;
filter = new GPUImagePixellateFilter();
movieFile.AddTarget(filter);
// Only rotate the video for display, leave orientation the same for recording
filter.AddTarget(imageView);
// In addition to displaying to the screen, write out a processed version of the movie to disk
var documents = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
var pathToMovie = Path.Combine(documents, "Movie.m4v");
// If a file already exists, AVAssetWriter won't let you record new frames, so delete the old movie
if (File.Exists(pathToMovie))
{
File.Delete(pathToMovie);
}
var movieURL = new NSUrl(pathToMovie, false);
var movieWriter = new GPUImageMovieWriter(movieURL, new CGSize(640.0f, 480.0f));
filter.AddTarget(movieWriter);
// Configure this for video from the movie file, where we want to preserve all video frames and audio samples
movieWriter.ShouldPassthroughAudio = true;
movieFile.AudioEncodingTarget = movieWriter;
movieFile.EnableSynchronizedEncoding(movieWriter);
var timer = NSTimer.CreateRepeatingScheduledTimer(0.3, _ => {
progressLabel.Text = movieFile.Progress.ToString("P0");
});
movieWriter.CompletionHandler = async() => {
filter.RemoveTarget(movieWriter);
await movieWriter.FinishRecordingAsync();
InvokeOnMainThread(() => {
timer.Invalidate();
progressLabel.Text = 1.ToString ("P0");
});
};
OnPixelWidthChanged(pixelWidthSlider);
movieWriter.StartRecording();
movieFile.StartProcessing();
}
async partial void OnTakePhoto(UIBarButtonItem sender)
{
sender.Enabled = false;
if (movieWriter == null)
{
// get new file path
var documents = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
var pathToMovie = Path.Combine(documents, "Movie.m4v");
if (File.Exists(pathToMovie))
{
File.Delete(pathToMovie);
}
movieUrl = new NSUrl(pathToMovie, false);
// start recording video
movieWriter = new GPUImageMovieWriter(movieUrl, new CGSize(480, 640));
movieWriter.EncodingLiveVideo = true;
sepiaFilter.AddTarget(movieWriter);
videoCamera.AudioEncodingTarget = movieWriter;
movieWriter.StartRecording();
Console.WriteLine("Video recording started.");
}
else
{
// stop recording video
sepiaFilter.RemoveTarget(movieWriter);
videoCamera.AudioEncodingTarget = null;
await movieWriter.FinishRecordingAsync();
// save to library
var library = new ALAssetsLibrary();
try {
var assetURL = await library.WriteVideoToSavedPhotosAlbumAsync(movieUrl);
Console.WriteLine("Video saved: " + assetURL);
} catch (Exception ex) {
Console.WriteLine("Video save error: " + ex);
}
movieWriter = null;
movieUrl = null;
Console.WriteLine("Video recording completed.");
}
sender.Enabled = true;
}