c# record audio, My code need to be fixed + explain. I appreciate very much

Question

1.00/5 (1 vote)

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When i run and record is work, but when i play the file I got the error.
Value can not be null.
Parameter name: source
in "playAudio" method(the last method).
I test when saving, "stream" (memorystream) is not null when record.
So I don't know i have error when record from stream to file, or error when retrive from file to temptorary stream

C#

private void button_Record_Stop_Click(object sender, RoutedEventArgs e)
        {
            if (microphone.State == MicrophoneState.Started)
            {
                stopRecord();
            }
            else
            {
                startRecord();
            }
        }
private void startRecord()
      {
          microphone.Start();    // Start record
         }
      // stop record===============================
private void stopRecord()
      {
          string fileName = generateFileName(".wav");    // make file name, return string type
          microphone.Stop(); // stop recording
          WriteFile(stream,fileName); // write audio in steam to file

      }

      void microphone_BufferReady(object sender, EventArgs e)
      {
          microphone.GetData(buffer);
          stream.Write(buffer, 0, buffer.Length);
      }

      void WriteFile(MemoryStream memoryStream,string fileName)
      {
          if (memoryStream == null)
          {
              MessageBox.Show("memory empty");
          }
          else
          {
              using (var myIso = IsolatedStorageFile.GetUserStoreForApplication())

              using (var fileStream = myIso.CreateFile(fileName))
              {
                  var audioBuffer = memoryStream.GetBuffer();
                  fileStream.Write(audioBuffer, 0, (int)memoryStream.Length);
                  fileStream.Flush();
              }

          }
      }
      // audio fucntion====================================


      // Play the file ===========================================
      private void button_Play_Click(object sender, RoutedEventArgs e)
      {
          Record fileRecord = listBox_Record.SelectedItem as Record;

          if (!(listBox_Record.SelectedItem == null))
          {
              var isf = IsolatedStorageFile.GetUserStoreForApplication();
              if (isf.FileExists(fileRecord.fileName))
              {
                  playAudio(fileRecord.fileName); // Go to playAudio method and play
              }
              else
              {
                  bindListAudio();
                  MessageBox.Show("File not exist");
              }
          }
          else
          {
              MessageBox.Show("Choose a file to play");
          }
      }
void playAudio(string fileName)
        {
            SoundEffect se;
            if (currentSound != null) // if player is playing
            {
                currentSound.Stop(); // stop playing
                currentSound = null; // clear memory of play to add the new one
            }
            var userStore = IsolatedStorageFile.GetUserStoreForApplication();
            if (userStore.FileExists(fileName))
            {

                using (var fileStream = userStore.OpenFile(fileName, FileMode.Open))
                {
                    se = SoundEffect.FromStream(fileStream);
                    fileStream.Close();
                }
                currentSound = se.CreateInstance();
            }
            currentSound.Play();
            textBlock_RecordingStatus.Text = "Playing";
         }

C#

Posted 19-Nov-12 23:25pm

tgsoon2002

Updated 20-Nov-12 0:41am

v4

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Comments

Richard MacCutchan 20-Nov-12 5:52am

I don't see a parameter named "source" in this code. Please indicate the exact line that gives the error and the exact message.

tgsoon2002 20-Nov-12 6:45am

this is only part of the program. After i check I don't have any parameter name source in the program.

tgsoon2002 20-Nov-12 6:47am

The line of error is
"se = SoundEffect.FromStream(fileStream);"
in playAdutio method(the last one.)

Richard MacCutchan 20-Nov-12 7:11am

You need to edit your original post (use the "Improve Question" link), and explain exactly what the problem is, including the exact text of any error messages and when they appear. We cannot see your screen or guess what is happening.

OriginalGriff 20-Nov-12 6:29am

If it is your code, why do you need it explained?

tgsoon2002 20-Nov-12 6:43am

I need to explain why it give me the error, And i'm not fully understand how it work. Only blurry of the idea.

Soroush Falahati 22-Nov-12 7:58am

What is SoundEffect Class?! Do you use XNA!? any way. I cant see any problem. But in this line:
fileStream.Flush();

Add this later:
fileStream.Close();

It may create problems.

tgsoon2002 3-Dec-12 6:05am

I rewrite mine already. However, thanks for support.

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tgsoon2002 · Accepted Answer · 2012-11-22T09:21:00

I rewrite to different project . And this is the most basic to record an audio file(As i have seen). You can save to seperate file and load from file.

public partial class MainPage : PhoneApplicationPage
    {
        byte[] buffer;
        MemoryStream stream = new MemoryStream();
        SoundEffectInstance currentSound = null;
        MediaLibrary library = new MediaLibrary();
        Microphone microphone = Microphone.Default;

        string fileName = "file.wav";
        // Constructor
        public MainPage()
        {
            InitializeComponent();

            microphone.BufferDuration = TimeSpan.FromSeconds(1);
            microphone.BufferReady += new EventHandler<eventargs>(microphone_BufferReady);

            DispatcherTimer dt = new DispatcherTimer();
            dt.Interval = TimeSpan.FromMilliseconds(33);
            dt.Tick += new EventHandler(dt_Tick);
            dt.Start();

            
        }

        private void OnAppbarRecordClick(object sender, EventArgs e)
        {
            stream.SetLength(0);
            buffer = new byte[microphone.GetSampleSizeInBytes(microphone.BufferDuration)];
            microphone.Start();
            statusText.Text = "recording";
        }

        void OnAppbarPlayClick(object sender, EventArgs args)
        {
            using (var myIso = IsolatedStorageFile.GetUserStoreForApplication())
            {
                if (myIso.FileExists(fileName))
                {
                    using (var fileStream = myIso.OpenFile(fileName, FileMode.Open))
                    {
                        stream.SetLength(0);
                        fileStream.CopyTo(stream);
                        SoundEffect sound = new SoundEffect(stream.ToArray(), microphone.SampleRate, AudioChannels.Stereo);
                        currentSound = sound.CreateInstance();
                    }
                }
                else
                {
                    errorText.Text = "File Not exist";
                }
            }

            
            
            currentSound.Play();
        }
        void OnAppbarPauseClick(object sender, EventArgs args)
        {
            currentSound.Pause();
        }

        private void OnAppbarStopClick(object sender, EventArgs e)
        {
            microphone.Stop();
            statusText.Text = "strop record";
            writeFile();
        }

        void microphone_BufferReady(object sender, EventArgs e)
        {
            microphone.GetData(buffer);
            stream.Write(buffer, 0, buffer.Length);
        }

        void dt_Tick(object sender, EventArgs e)
        {
            try { FrameworkDispatcher.Update(); }
            catch { }
        }

        void writeFile()
        {
            
            using (var myIso = IsolatedStorageFile.GetUserStoreForApplication())
            {
                using (var fileStream = myIso.CreateFile(fileName))
                {
                    var audioBuffer = stream.GetBuffer();
                    fileStream.Write(audioBuffer, 0, (int)stream.Length);
                }
            }
        }



    }</eventargs>