I Developed Red 5 flex application for record live video stream. now I want to record same stream as gray scale.
This is code in action-script :
ns= new NetStream(nc);
ns.videoStreamSettings = h264Settings;
ns.publish(stream_id,"record");
ns.attachAudio(mic);
ns.attachCamera(cam);
Code Red5 Server :
public void recordShow() {
IConnection conn = Red5.getConnectionLocal();
logger.debug("Recording show for: {}", conn.getScope().getContextPath());
String streamName = String.valueOf(System.currentTimeMillis());
// Get a reference to the current broadcast stream.
IBroadcastStream stream = app.getBroadcastStream(conn.getScope(), "hostStream");
try {
// Save the stream to disk.
stream.saveAs(streamName, false);
} catch (Exception e) {
logger.error("Error while saving stream: {}", streamName);
}
}
I tried with filters, it show gray-scale but not record in gray-scale. How can I convert live stream in gray-scale, and record in gray-scale.
Related
I am developing a code that will allow me to send small amounts of data between my arduino mega and my windows 8.1 phone using a HC-05 bluetooth module.
Sending data from the phone to the arduino was pretty simple, but I am having a dire time attempting to read data that comes back from the arduino that I send on the serial port.
For testing purposes my code is simple, sending ascii charaters 'a' & 'b' to turn an LED on & off, this could not work any better, but I am having trouble trying to figure out how to correctly read the data that I send back to my phone.
I send a single arbitrary ascii character back to the phone but I cannot for the life of me figure out the correct way of reading this data from the bluetooth stream I have setup.
I have been trying for nearly two days, but everything I try ends up freezing my phone with no exceptions thrown? A lot of posts online send me to the Nokia dev site which is now inactive.
I have tried using the 'datareader' and the 'streamreader' classes to do this but it always freezes, does anyone know how to make this work? And why my streamreader keeps freezing my phone?
I have tried to annotate my code appropriatley (seen below). The problem occurs in the 'Tick' event handler at the bottom of the code.
(FYI: All capabilities have been added to the manifest files so this shouldn't be the problem).
Thank you.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using Bluetooth_SL.Resources;
using Windows.Networking;
using Windows.Networking.Proximity;
using Windows.Networking.Sockets;
using Windows.Devices.Bluetooth;
using System.IO;
using Microsoft.Xna.Framework;
using System.Windows.Threading;
using Windows.Storage.Streams; // <-- for the datareader class
namespace Bluetooth_SL // silverlight, does this matter?
{
public partial class MainPage : PhoneApplicationPage
{
DispatcherTimer Timer = new DispatcherTimer();
StreamSocket socket = new StreamSocket();
StreamWriter writer;
StreamReader reader;
public MainPage()
{
InitializeComponent();
Timer.Interval = TimeSpan.FromMilliseconds(1000); // dispatcher timer used to check for incoming data from arduino
Timer.Tick += Timer_Tick; // event handler for dispatcher timer
}
protected override void OnNavigatedFrom(NavigationEventArgs e) // frees up memory
{
socket.Dispose();
}
private void Connect_But_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
ConnectToBluetooth();
}
private async void ConnectToBluetooth() // sets up the connection // this works fine
{
// Configure PeerFinder to search for all paired devices.
PeerFinder.AlternateIdentities["Bluetooth:Paired"] = "";
var pairedDevices = await PeerFinder.FindAllPeersAsync();
if (pairedDevices.Count == 0)
{
Debug_Block.Text = "No paired devices were found.";
}
else
{
Debug_Block.Text = "Found";
PeerInformation selectedDevice = pairedDevices[0]; // pick the first paired device
try // 'try' used in the case the socket has already been connected
{
await socket.ConnectAsync(selectedDevice.HostName, "1");
writer = new StreamWriter(socket.OutputStream.AsStreamForWrite());
writer.AutoFlush = true;
reader = new StreamReader(socket.InputStream.AsStreamForRead());
Debug_Block.Text = "Connected";
}
catch (Exception x)
{
Debug_Block.Text = x.ToString();
}
}
}
private void SendButton_Tap(object sender, System.Windows.Input.GestureEventArgs e) // this works perfectly
{
try { writer.WriteLine("a"); } // attempts to write the ascii 'a' to the arduino which turns on the on-board LED
catch { Debug_Block.Text = "Failed to write"; }
}
private void SendButton_Off_Tap(object sender, System.Windows.Input.GestureEventArgs e) // this works perfectly
{
try { writer.WriteLine("b"); } // attempts to write the ascii 'b' to the arduino which turns off the on-board LED
catch { Debug_Block.Text = "Failed to write"; }
}
private void ReadButtonToggle_Tap(object sender, System.Windows.Input.GestureEventArgs e) // toggles the timer on and off
{
if(Timer.IsEnabled == true)
{
Timer.Stop();
Debug_Block.Text = "Timer Stopped";
}
else
{
Timer.Start();
Debug_Block.Text = "Timer Started";
}
}
void Timer_Tick(object sender, EventArgs e) // THIS IS THE PROBLEM
{
Debug_Block.Text = "Tick";
Debug_Block.Text = reader.ReadLine(); // <-- ALWAYS FREEZES HERE
Timer.Stop(); // This line is temporary for debugging
}
}
}
I'm pretty new on Windows Phone 8.1 development and what I'm currently trying is recording a video and store it on the Windows Phone. However, I don't have any idea how that can be done. I have some code excerpt below which is the code executed when the start/stop record button is pressed. The code is taken from an example.
My questions:
How _videoFile can be saved to the VideoLibrary?
Preferably I would like the program to execute a method when recording is stopped. How I get the video filename inside this method?
private async void OnCaptureVideoButtonClick(object sender, RoutedEventArgs e)
{
if (!_capturingVideo)
{
//BtnStartStop.Content = "Stop";
StartAppBarButton.Icon = new SymbolIcon(Symbol.Stop);
_capturingVideo = true;
_videoFile = await TestedControl.StartVideoCaptureAsync(KnownFolders.VideosLibrary, "capture.mp4");
CapturedVideoElement.Visibility = Visibility.Visible;
IRandomAccessStreamWithContentType stream;
try
{
stream = await TryCatchRetry.RunWithDelayAsync<Exception, IRandomAccessStreamWithContentType>(
_videoFile.OpenReadAsync(),
TimeSpan.FromSeconds(0.5),
10);
}
catch (Exception ex)
{
#pragma warning disable 4014
new MessageDialog(ex.Message, "Error").ShowAsync();
#pragma warning restore 4014
return;
}
CapturedVideoElement.SetSource(stream, _videoFile.ContentType);
}
else
{
StartAppBarButton.Icon = new SymbolIcon(Symbol.Camera);
_capturingVideo = false;
#pragma warning disable 4014
await TestedControl.StopCapture();
#pragma warning restore 4014
}
}
Using the await keyword, StartVideoCaptureAsync is called asynchronously.
So the next line of code will be executed only once this asynchronous task is finished.
It means that the line of code below (and all the next ones):
CapturedVideoElement.Visibility = Visibility.Visible
will be executing at the end of the recording.
So if you need to execute a method after the recording is done, you can just put it after the call of StartVideoCaptureAsync.
I'm working on a Windows Phone 8 app.
I'm having issue appending to my JSON file.
It works fine if I keep the app open but once I close it and come back in it starts back writing from the beginning of the file.
Relevant code:
private async void btnSave_Click(object sender, RoutedEventArgs e)
{
// Create a entry and intialize some values from textbox...
GasInfoEntries _entry = null;
_entry = new GasInfoEntries();
_entry.Gallons = TxtBoxGas.Text;
_entry.Price = TxtBoxPrice.Text;
_GasList.Add(_entry);
//TxtBlockPricePerGallon.Text = (double.Parse(TxtBoxGas.Text) / double.Parse(TxtBoxPrice.Text)).ToString();
// Serialize our Product class into a string
string jsonContents = JsonConvert.SerializeObject(_GasList);
// Get the app data folder and create or open the file we are storing the JSON in.
StorageFolder localFolder = ApplicationData.Current.LocalFolder;
StorageFile textfile = await localFolder.CreateFileAsync("gasinfo.json", CreationCollisionOption.OpenIfExists); //if get await operator error add async to class (btnsave)
//open file
using (IRandomAccessStream textstream = await textfile.OpenAsync(FileAccessMode.ReadWrite))
{
//write JSON string
using (DataWriter textwriter = new DataWriter(textstream))
//using (DataWriter textwriter = new DataWriter(textstream))
{
textwriter.WriteString(jsonContents);
await textwriter.StoreAsync(); //writes buffer to store
}
}
}
private async void btnShow_Click(object sender, RoutedEventArgs e)
{
StorageFolder localfolder = ApplicationData.Current.LocalFolder;
try
{
// Getting JSON from file if it exists, or file not found exception if it does not
StorageFile textfile = await localfolder.GetFileAsync("gasinfo.json");
using (IRandomAccessStream textstream = await textfile.OpenReadAsync())
{
//read text stream
using (DataReader textreader = new DataReader(textstream))
{
//get size ...not sure what for think check the file size (lenght) then based on next 2 commands waits until its all read
uint textlength = (uint)textstream.Size;
await textreader.LoadAsync(textlength);
//read it
string jsonContents = textreader.ReadString(textlength);
// deserialize back to gas info
_GasList = JsonConvert.DeserializeObject<List<GasInfoEntries>>(jsonContents) as List<GasInfoEntries>;
displayGasInfoEntries();
}
}
}
catch
{
txtShow.Text = "something went wrong";
}
}
private void displayGasInfoEntries()
{
txtShow.Text = "";
StringBuilder GasString = new StringBuilder();
foreach (GasInfoEntries _entry in _GasList)
{
GasString.AppendFormat("Gallons: {0} \r\n Price: ${1} \r\n", _entry.Gallons, _entry.Price); // i think /r/n means Return and New line...{0} and {1} calls "variables" in json file
}
txtShow.Text = GasString.ToString();
}
Thanks
Do you call the btnShow_Click each time you've started the app? Because otherwise the _GasList will be empty; if you now call the btnSave_Click all previous made changes will be lost.
So please make sure, that you restore the previously saved json data before you add items to the _GasList.
I would like to download a xml file from web, then save it to the local storage but I do not know how to do that. Please to help me clearly or give me an example. Thank you.
Downloading a file is a huge subject and can be done in many ways. I assume that you know the Uri of the file you want to download, and want you mean by local is IsolatedStorage.
I'll show three examples how it can be done (there are also other ways).
1. The simpliest example will dowload string via WebClient:
public static void DownloadFileVerySimle(Uri fileAdress, string fileName)
{
WebClient client = new WebClient();
client.DownloadStringCompleted += (s, ev) =>
{
using (IsolatedStorageFile ISF = IsolatedStorageFile.GetUserStoreForApplication())
using (StreamWriter writeToFile = new StreamWriter(ISF.CreateFile(fileName)))
writeToFile.Write(ev.Result);
};
client.DownloadStringAsync(fileAdress);
}
As you can see I'm directly downloading string (ev.Result is a string - that is a disadventage of this method) to IsolatedStorage.
And usage - for example after Button click:
private void Download_Click(object sender, RoutedEventArgs e)
{
DownloadFileVerySimle(new Uri(#"http://filedress/myfile.txt", UriKind.Absolute), "myfile.txt");
}
2. In the second method (simple but more complicated) I'll use again WebClient and I'll need to do it asynchronously (if you are new to this I would suggest to read MSDN, async-await on Stephen Cleary blog and maybe some tutorials).
First I need Task which will download a Stream from web:
public static Task<Stream> DownloadStream(Uri url)
{
TaskCompletionSource<Stream> tcs = new TaskCompletionSource<Stream>();
WebClient wbc = new WebClient();
wbc.OpenReadCompleted += (s, e) =>
{
if (e.Error != null) tcs.TrySetException(e.Error);
else if (e.Cancelled) tcs.TrySetCanceled();
else tcs.TrySetResult(e.Result);
};
wbc.OpenReadAsync(url);
return tcs.Task;
}
Then I'll write my method downloading a file - it also need to be async as I'll use await DownloadStream:
public enum DownloadStatus { Ok, Error };
public static async Task<DownloadStatus> DownloadFileSimle(Uri fileAdress, string fileName)
{
try
{
using (Stream resopnse = await DownloadStream(new Uri(#"http://filedress/myfile.txt", UriKind.Absolute)))
using (IsolatedStorageFile ISF = IsolatedStorageFile.GetUserStoreForApplication())
{
if (ISF.FileExists(fileName)) return DownloadStatus.Error;
using (IsolatedStorageFileStream file = ISF.CreateFile(fileName))
resopnse.CopyTo(file, 1024);
return DownloadStatus.Ok;
}
}
catch { return DownloadStatus.Error; }
}
And usage of my method for example after Button click:
private async void Downlaod_Click(object sender, RoutedEventArgs e)
{
DownloadStatus fileDownloaded = await DownloadFileSimle(new Uri(#"http://filedress/myfile.txt", UriKind.Absolute), "myfile.txt");
switch (fileDownloaded)
{
case DownloadStatus.Ok:
MessageBox.Show("File downloaded!");
break;
case DownloadStatus.Error:
default:
MessageBox.Show("There was an error while downloading.");
break;
}
}
This method can have problems for example if you try to download very big file (example 150 Mb).
3. The third method - uses WebRequest with again async-await, but this method can be changed to download files via buffer, and therefore not to use too much memory:
First I'll need to extend my Webrequest by a method that will asynchronously return a Stream:
public static class Extensions
{
public static Task<Stream> GetRequestStreamAsync(this WebRequest webRequest)
{
TaskCompletionSource<Stream> taskComplete = new TaskCompletionSource<Stream>();
webRequest.BeginGetRequestStream(arg =>
{
try
{
Stream requestStream = webRequest.EndGetRequestStream(arg);
taskComplete.TrySetResult(requestStream);
}
catch (Exception ex) { taskComplete.SetException(ex); }
}, webRequest);
return taskComplete.Task;
}
}
Then I can get to work and write my Downloading method:
public static async Task<DownloadStatus> DownloadFile(Uri fileAdress, string fileName)
{
try
{
WebRequest request = WebRequest.Create(fileAdress);
if (request != null)
{
using (Stream resopnse = await request.GetRequestStreamAsync())
{
using (IsolatedStorageFile ISF = IsolatedStorageFile.GetUserStoreForApplication())
{
if (ISF.FileExists(fileName)) return DownloadStatus.Error;
using (IsolatedStorageFileStream file = ISF.CreateFile(fileName))
{
const int BUFFER_SIZE = 10 * 1024;
byte[] buf = new byte[BUFFER_SIZE];
int bytesread = 0;
while ((bytesread = await resopnse.ReadAsync(buf, 0, BUFFER_SIZE)) > 0)
file.Write(buf, 0, bytesread);
}
}
return DownloadStatus.Ok;
}
}
return DownloadStatus.Error;
}
catch { return DownloadStatus.Error; }
}
Again usage:
private async void Downlaod_Click(object sender, RoutedEventArgs e)
{
DownloadStatus fileDownloaded = await DownloadFile(new Uri(#"http://filedress/myfile.txt", UriKind.Absolute), "myfile.txt");
switch (fileDownloaded)
{
case DownloadStatus.Ok:
MessageBox.Show("File downloaded!");
break;
case DownloadStatus.Error:
default:
MessageBox.Show("There was an error while downloading.");
break;
}
}
Those methods of course can be improved but I think this can give you an overview how it can look like. The main disadvantage of these methods may be that they work in foreground, which means that when you exit your App or hit start button, downloading stops. If you need to download in background you can use Background File Transfers - but that is other story.
As you can see you can reach your goal in many ways. You can read more about those methods on many pages, tutorials and blogs, compare an choose the most suitable.
Hope this helps. Happy coding and good luck.
I have a valid URL for a remote JPEG which I'm trying to load in the background. But I find I never get control back after invoking the BitmapImage() constructor. My question is, should this approach work, or should I pitch it all, load up BcpAsync project from NuGet and start working with WebClient asynch methods?
A sample URL for which it fails is
http://image.weather.com/images/maps/current/garden_june_720x486.jpg
It is valid. .UpdateAsync() references it from AppViewModel.Instance, it's not explicitly referenced here.
Here's the background agent:
protected override async void OnInvoke(ScheduledTask task)
{
AppViewModel.LoadData();
await AppViewModel.Instance.RemoteImageProxy.UpdateAsync();
AppViewModel.Instance.ImageUrl = AppViewModel.Instance.RemoteImageProxy.LocalFileUri;
AppViewModel.Instance.UpdateCount++;
PinnedTile.Update();
}
AppViewModel.SaveData();
#if DEBUG
ScheduledActionService.LaunchForTest(task.Name, TimeSpan.FromSeconds(AppViewModel.Instance.BgAgentInterval));
#endif
NotifyComplete();
}
Here's the invoked method:
public Task<double> UpdateAsync() {
LastCheckedTime = DateTime.UtcNow;
CompletionTask = new TaskCompletionSource<double>();
// Not usually called on UI thread, not worth optimizing for that case here.
Deployment.Current.Dispatcher.BeginInvoke(() => { //todo determine whether System.Windows.Deployment.Dispatcher can be called from main app, or just bgAgent.
HelperImageControl = new Image();
HelperImageControl.Loaded += im_Loaded;
HelperImageControl.ImageFailed += im_ImageFailed;
HelperImageControl.ImageOpened += im_ImageOpened;
// breakpoint here
HelperImageControl.Source = new BitmapImage(SourceUri);
// stepping over the function, control does not return here. Nor are any of the above events fired.
});
return CompletionTask.Task; // this will be completed in one of the subsequent control events...
}
You need to call CompletionTask.SetResult(); to return control back to the caller method.
This works (I'm returning 100 in case of successful download because you set the task to return double).
TaskCompletionSource<double> CompletionTask;
public Task<double> UpdateAsync()
{
CompletionTask = new TaskCompletionSource<double>();
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
var HelperImageControl = new Image();
var bmp = new BitmapImage();
bmp.ImageOpened += bmp_ImageOpened;
bmp.ImageFailed += bmp_ImageFailed;
bmp.CreateOptions = BitmapCreateOptions.None;
bmp.UriSource = new Uri("http://image.weather.com/images/maps/current/garden_june_720x486.jpg", UriKind.Absolute);
HelperImageControl.Source = bmp;
});
return CompletionTask.Task;
}
void bmp_ImageFailed(object sender, ExceptionRoutedEventArgs e)
{
CompletionTask.SetException(e.ErrorException);
}
void bmp_ImageOpened(object sender, RoutedEventArgs e)
{
CompletionTask.SetResult(100);
}