Is there a property on the AVAudioPlayer class that I can use to get the samples? If not is there another class I can use to get this information?
Here's what I have:
var openDialog = NSOpenPanel.OpenPanel;
openDialog.CanChooseFiles = true;
openDialog.CanChooseDirectories = false;
openDialog.AllowedFileTypes = new string[] { "wav" };
if (openDialog.RunModal() == 1)
{
var url = openDialog.Urls[0];
if (url != null)
{
var path = url.Path;
var audioplayer = AVFoundation.AVAudioPlayer.FromUrl(file);
var samples = audioplayer.SAMPLES?;
Visual Studio Mac (C# / Xamarin)
AVAudioPlayer does not give you access to the sample data, but if you switch playback to AVPlayer you can use an MTAudioProcessingTap to "tap" the samples as they are played.
If you simply want to examine the samples in your file you can use AVAudioFile.
// get the total number of samples
var audioFile = new AVAudioFile(file, out outError);
var samples = audioFile.Length;
Related
How to receive file in my xamarin app from another's app share function?
if (Intent.Action == Intent.ActionSend)
{
{
// This is just an example of the data stored in the extras
var uriFromExtras = Intent.GetParcelableExtra(Intent.ExtraStream) asAndroid.Net.Uri;
var subject = Intent.GetStringExtra(Intent.ExtraSubject);
// Get the info from ClipData
var pdf = Intent.ClipData.GetItemAt(0);
// Open a stream from the URI
var pdfStream = ContentResolver.OpenInputStream(pdf.Uri);
// Save it over
var memOfPdf = new System.IO.MemoryStream();
pdfStream.CopyTo(memOfPdf);
var docsPath = System.Environment.GetFolderPat(System.Environment.SpecialFolder.Personal);
var filePath = System.IO.Path.Combine(docsPath, "temp.pdf");
System.IO.File.WriteAllBytes(filePath, memOfPdf.ToArray());
mainForms.DisplayThePDF(filePath);
}
}
this is only for PDF and also not working well.
I am using MediaCapture to preview camera on the screen, which is working fine.
However, I need to access the current frames in my App. Therefore I added FrameReader to the MediaCapture to get the event Reader_FrameArrived.
So the event is working, however the bitmap itself is always null.
I implemented the ecent callback just like shown in the examples:
var mediaFrameReference = sender.TryAcquireLatestFrame();
var videoMediaFrame = mediaFrameReference?.VideoMediaFrame;
var softwareBitmap = videoMediaFrame?.SoftwareBitmap;
if (softwareBitmap != null)
{
Debug.WriteLine("here");
}
else
{
return;
}
and this is how I initialize the reader:
var frameSourceGroups = await MediaFrameSourceGroup.FindAllAsync();
var allGroups = await MediaFrameSourceGroup.FindAllAsync();
var eligibleGroups = allGroups.Select(g => new
{
Group = g,
// For each source kind, find the source which offers that kind of media frame,
// or null if there is no such source.
SourceInfos = new MediaFrameSourceInfo[]
{
g.SourceInfos.FirstOrDefault(info => info.SourceKind == MediaFrameSourceKind.Color),
g.SourceInfos.FirstOrDefault(info => info.SourceKind == MediaFrameSourceKind.Depth),
g.SourceInfos.FirstOrDefault(info => info.SourceKind == MediaFrameSourceKind.Infrared),
}
}).Where(g => g.SourceInfos.Any(info => info != null)).ToList();
if (eligibleGroups.Count == 0)
{
System.Diagnostics.Debug.WriteLine("No source group with color, depth or infrared found.");
return;
}
var selectedGroupIndex = 0; // Select the first eligible group
MediaFrameSourceGroup selectedGroup = eligibleGroups[selectedGroupIndex].Group;
MediaFrameSourceInfo colorSourceInfo = eligibleGroups[selectedGroupIndex].SourceInfos[0];
MediaFrameSourceInfo infraredSourceInfo = eligibleGroups[selectedGroupIndex].SourceInfos[1];
MediaFrameSourceInfo depthSourceInfo = eligibleGroups[selectedGroupIndex].SourceInfos[2];
//_mediaCapture.FrameSources.TryGetValue(cameraDevice.Id, out _source);
var colorFrameSource = _mediaCapture.FrameSources[colorSourceInfo.Id];
if (colorFrameSource != null)
{
_reader = await _mediaCapture.CreateFrameReaderAsync(colorFrameSource, MediaEncodingSubtypes.Argb32);
_reader.FrameArrived += Reader_FrameArrived;
MediaFrameReaderStartStatus result = await _reader.StartAsync();
Debug.WriteLine(result.ToString());
}
Any ideas why the bitmap could be null?
I am using MediaCapture to preview camera on the screen, which is working fine.
For the scenario, we suggest you use MediaCapture class capture bitmap, it contains GetPreviewFrameAsync method gets a preview frame from the capture device than convert it to SoftwareBitmap.
private async Task GetPreviewFrameAsSoftwareBitmapAsync()
{
// Get information about the preview
var previewProperties = _mediaCapture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview) as VideoEncodingProperties;
// Create the video frame to request a SoftwareBitmap preview frame
var videoFrame = new VideoFrame(BitmapPixelFormat.Bgra8, (int)previewProperties.Width, (int)previewProperties.Height);
// Capture the preview frame
using (var currentFrame = await _mediaCapture.GetPreviewFrameAsync(videoFrame))
{
// Collect the resulting frame
SoftwareBitmap previewFrame = currentFrame.SoftwareBitmap;
// Show the frame information
FrameInfoTextBlock.Text = String.Format("{0}x{1} {2}", previewFrame.PixelWidth, previewFrame.PixelHeight, previewFrame.BitmapPixelFormat);
// Add a simple green filter effect to the SoftwareBitmap
if (GreenEffectCheckBox.IsChecked == true)
{
ApplyGreenFilter(previewFrame);
}
// Show the frame (as is, no rotation is being applied)
if (ShowFrameCheckBox.IsChecked == true)
{
// Create a SoftwareBitmapSource to display the SoftwareBitmap to the user
var sbSource = new SoftwareBitmapSource();
await sbSource.SetBitmapAsync(previewFrame);
// Display it in the Image control
PreviewFrameImage.Source = sbSource;
}
// Save the frame (as is, no rotation is being applied)
if (SaveFrameCheckBox.IsChecked == true)
{
var file = await _captureFolder.CreateFileAsync("PreviewFrame.jpg", CreationCollisionOption.GenerateUniqueName);
Debug.WriteLine("Saving preview frame to " + file.Path);
await SaveSoftwareBitmapAsync(previewFrame, file);
}
}
}
And here is official code sample that you could refer directly.
I using libCLCSharp and xamarin forms to playvideo.
With this url below is OK. but when i replace by an youtuble video it can not to play.
how can i do it. Thanks
my code:
_libvlc = new LibVLC();
var media = new Media(_libvlc, "http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4", FromType.FromLocation);
myVideo.MediaPlayer = new MediaPlayer(media) { EnableHardwareDecoding = true };
myVideo.MediaPlayer.Play();
Docs: https://code.videolan.org/videolan/LibVLCSharp/-/blob/3.x/docs/how_do_I_do_X.md#how-do-i-play-a-youtube-video
Core.Initialize();
using(var libVLC = new LibVLC())
{
var media = new Media(libVLC, "https://www.youtube.com/watch?v=dQw4w9WgXcQ", FromType.FromLocation);
await media.Parse(MediaParseOptions.ParseNetwork);
using (var mp = new MediaPlayer(media.SubItems.First()))
{
mp.Play();
}
}
I'm using the media manager nuget plugin and it's great, but for the life of me, I can't get the lock screen or car bluetooth to show the notifications. I'm using the following to display the notifications (set within OnAppearing)
ViewModel.PropertyChanged += (sender, e) =>
{
switch (e.PropertyName)
{
case "RadioSchedule":
if (listData != null)
{
listData.ItemsSource = null;
var first = ViewModel.RadioSchedule[0];
Device.BeginInvokeOnMainThread(() =>
{
listData.ItemsSource = ViewModel.RadioSchedule;
MediaFile.Metadata.Artist = MediaFile.Metadata.DisplaySubtitle = MediaFile.Metadata.AlbumArtist = first.Artist;
MediaFile.Metadata.Title = MediaFile.Metadata.DisplayTitle = first.Track;
MediaFile.Metadata.DisplayIcon = new Image { Source = "icon".CorrectedImageSource() };
MediaFile.Metadata.BluetoothFolderType = "1";
MediaFile.Type = MediaFileType.Audio;
MediaFile.Url = Constants.RadioStream;
MediaFile.Availability = ResourceAvailability.Remote;
MediaFile.MetadataExtracted = true;
MediaFile.Metadata.Date = DateTime.Now;
MediaFile.Metadata.Duration = 300;
MediaFile.Metadata.Genre = "Rock";
MediaFile.Metadata.TrackNumber = MediaFile.Metadata.NumTracks = 1;
MediaFile.Metadata.DisplayDescription = "Radio Station";
if (!ViewModel.NotificationStarted)
{
if (CrossMediaManager.Current.MediaNotificationManager != null)
CrossMediaManager.Current.MediaNotificationManager.StartNotification(MediaFile);
ViewModel.NotificationStarted = true;
}
CrossMediaManager.Current.MediaNotificationManager?.UpdateNotifications(MediaFile, MediaPlayerStatus.Playing);
});
}
break;
The code itself is being hit (I can set break points and they are hit). I've tried it on and off the UI thread as well.
The playlist comes from a webapi which works fine. The notifier gives unknown/unknown on the device media player (both iOS and Android) and nothing in-car. For Android, the permissions the readme file says to use have also been set.
Is there some sort of magic I have to do to get this to work? This is a Xam.Forms package rather than something native.
The MediaPlayer is started further in the class using the following code
CrossMediaManager.Current.Play(Constants.RadioStream, MediaFileType.Audio, ResourceAvailability.Remote);
Where Constants.RadioStream is the URL of the radio stream.
I'm using the following Xamarin tutorial https://developer.xamarin.com/recipes/android/media/video/record_video/
I can successfully record video and audio however the quality is not very good. Can anyone suggest/explain how I can increase the quality please?
I know the device can record in higher quality because the native camera app record in much higher quality.
EDIT here is my code so far
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.RecordVideo);
var record = FindViewById<Button>(Resource.Id.Record);
var stop = FindViewById<Button>(Resource.Id.Stop);
var play = FindViewById<Button>(Resource.Id.Play);
var video = FindViewById<VideoView>(Resource.Id.SampleVideoView);
var videoPlayback = FindViewById<VideoView>(Resource.Id.PlaybackVideoView);
string path = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath + "/test.mp4";
if (Camera.NumberOfCameras < 2)
{
Toast.MakeText(this, "Front camera missing", ToastLength.Long).Show();
return;
}
video.Visibility = ViewStates.Visible;
videoPlayback.Visibility = ViewStates.Gone;
_camera = Camera.Open(1);
_camera.SetDisplayOrientation(90);
_camera.Unlock();
recorder = new MediaRecorder();
recorder.SetCamera(_camera);
recorder.SetAudioSource(AudioSource.Mic);
recorder.SetVideoSource(VideoSource.Camera);
recorder.SetOutputFormat(OutputFormat.Default);
recorder.SetAudioEncoder(AudioEncoder.Default);
recorder.SetVideoEncoder(VideoEncoder.Default);
//var cameraProfile = CamcorderProfile.Get(CamcorderQuality.HighSpeed1080p);
// recorder.SetProfile(cameraProfile);
recorder.SetOutputFile(path);
recorder.SetOrientationHint(270);
recorder.SetPreviewDisplay(video.Holder.Surface);
record.Click += delegate
{
recorder.Prepare();
recorder.Start();
};
stop.Click += delegate
{
if (recorder != null)
{
video.Visibility = ViewStates.Gone;
videoPlayback.Visibility = ViewStates.Visible;
recorder.Stop();
recorder.Release();
}
};
play.Click += delegate
{
video.Visibility = ViewStates.Gone;
videoPlayback.Visibility = ViewStates.Visible;
var uri = Android.Net.Uri.Parse(path);
videoPlayback.SetVideoURI(uri);
videoPlayback.Start();
};
}
I don't see the example specifying the CamcorderProfile anywhere so you might want to start from that. It's possible that the default framerate, bitrate and video frame size are lower than you'd expect. I'm not an a computer right now but try to set the profile to for example QUALITY_1080p using the SetProfile method in MediaRecorder.
You need to set the profile after setting the video and audio sources but before calling SetOutputFile method.