public void GenerateCGImagesAsynchronously()
{
// This test deadlocks on Mountain Lion (but works on Lion)
// https://gist.github.com/rolfbjarne/1190d97af79e554c298f2c133dfd8e87
TestRuntime.AssertSystemVersion(ApplePlatform.MacOSX, 10, 9, throwIfOtherPlatform: false);
handled = false;
mre = new ManualResetEvent(false);
ThreadStart main = () => {
using (NSUrl video_url = NSUrl.FromFilename(video_asset_path))
using (AVAsset video_asset = AVAsset.FromUrl(video_url))
using (AVAssetImageGenerator aig = new AVAssetImageGenerator(video_asset)) {
NSValue[] values = new NSValue[] { NSValue.FromCMTime(CMTime.Zero) };
aig.GenerateCGImagesAsynchronously(values, handler);
mre.WaitOne();
}
};
var thread = new Thread(main)
{
IsBackground = true,
};
thread.Start();
Assert.True(mre.WaitOne(2000), "wait");
Assert.True(handled, "handled");
}
void HandleVideo(MediaFile file)
{
if (file == null)
{
return;
}
var mediaUrl = file.Path;
var documentsDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
var outputFile = Path.Combine(documentsDirectory, Guid.NewGuid().ToString() + ".mp4");
AVUrlAsset asset = new AVUrlAsset(NSUrl.CreateFileUrl(new string[] { mediaUrl }));
AVAssetExportSession exportSession = new AVAssetExportSession(asset, AVAssetExportSession.Preset1280x720);
var fileUrl = NSUrl.CreateFileUrl(new string[] { outputFile });
exportSession.OutputUrl = NSUrl.CreateFileUrl(new string[] { outputFile });
exportSession.OutputFileType = AVFileType.Mpeg4;
LoadingScreen.Show();
LoadingScreen.SetText("Converting");
exportSession.ExportAsynchronously(() =>
{
InvokeOnMainThread(() =>
{
if (exportSession.Error != null)
{
int i = 3;
}
AVUrlAsset asset2 = new AVUrlAsset(NSUrl.CreateFileUrl(new string[] { mediaUrl }));
AVAssetImageGenerator generator = new AVAssetImageGenerator(asset2);
generator.AppliesPreferredTrackTransform = true;
var thumbTime = new CMTime(0, 30);
NSValue[] vals = new NSValue[] { NSValue.FromCMTime(thumbTime) };
CGSize maxSize = new CGSize(800, 600);
//generator.MaximumSize = maxSize;
generator.GenerateCGImagesAsynchronously(vals, (requestedTime, imageRef, actualTime, result, error) =>
{
var previewImage = System.IO.Path.Combine(documentsDirectory, Guid.NewGuid() + ".jpg");
NSError err;
UIImage.FromImage(new CGImage(imageRef)).AsJPEG(.75f).Save(previewImage, false, out err);
InvokeOnMainThread(() =>
{
LoadingScreen.Hide();
VideoPicked?.Invoke(outputFile, previewImage);
});
});
});
});
}
public void GenerateCGImagesAsynchronously_Compat()
{
handled = false;
mre = new ManualResetEvent(false);
ThreadStart main = () => {
using (NSUrl video_url = NSUrl.FromFilename(video_asset_path))
using (AVAsset video_asset = AVAsset.FromUrl(video_url))
using (AVAssetImageGenerator aig = new AVAssetImageGenerator(video_asset)) {
aig.GenerateCGImagesAsynchronously(NSValue.FromCMTime(CMTime.Zero), handler);
mre.WaitOne();
}
};
var asyncResult = main.BeginInvoke(null, null);
main.EndInvoke(asyncResult);
Assert.True(mre.WaitOne(2000));
Assert.True(handled, "handled");
}
