How to Use NAudio to record audio in web app

Question

I need complete code in c# that uses NAudio in web app. All examples I found so far use winform.
I tried visoForge.NAudio in webform page. But I was not able to figure out how to plumb it out.
First I want to be able to record my voice and paly it back to make sure I did right.
using System;
using System.Web.UI;

using VisioForge.Shared.NAudio.Wave;

namespace NAudiWebApp
{
class SavingWaveProvider : IWaveProvider, IDisposable
{

    private readonly IWaveProvider sourceWaveProvider;
    private readonly WaveFileWriter writer;
    private bool isWriterDisposed;

    public SavingWaveProvider(IWaveProvider sourceWaveProvider, string wavFilePath)
    {
        this.sourceWaveProvider = sourceWaveProvider;
        writer = new WaveFileWriter(wavFilePath, sourceWaveProvider.WaveFormat);
    }
    public WaveFormat WaveFormat { get { return sourceWaveProvider.WaveFormat; } }

    public void Dispose()
    {
        if (!isWriterDisposed)
        {
            isWriterDisposed = true;
            writer.Dispose();
        }
    }

    public int Read(byte[] buffer, int offset, int count)
    {
        var read = sourceWaveProvider.Read(buffer, offset, count);
        if (count > 0 && !isWriterDisposed)
        {
            writer.Write(buffer, offset, read);
        }
        if (count == 0)
        {
            Dispose(); // auto-dispose in case users forget
        }
        return read;
    }
}

public partial class About : Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    private WaveIn recorder;
    private BufferedWaveProvider bufferedWaveProvider;
    private SavingWaveProvider savingWaveProvider;
    private WaveOut player;
    IWavePlayer waveOut;
    WaveRecorder recorder1;


    protected void OnStartRecordingClick(object sender, EventArgs e)
    {
        // set up the recorder
        recorder = new WaveIn();
        recorder.DataAvailable += RecorderOnDataAvailable;

        // set up our signal chain
        bufferedWaveProvider = new BufferedWaveProvider(recorder.WaveFormat);
        savingWaveProvider = new SavingWaveProvider(bufferedWaveProvider, "temp.wav");

        // set up playback
        player = new WaveOut();
        player.Init(savingWaveProvider);

        // begin playback & record
        player.Play();
        recorder.StartRecording();
    }

    private void RecorderOnDataAvailable(object sender, WaveInEventArgs waveInEventArgs)
    {
        bufferedWaveProvider.AddSamples(waveInEventArgs.Buffer, 0, waveInEventArgs.BytesRecorded);
    }

    protected void OnStopRecordingClick(object sender, EventArgs e)
    {
        // stop recording
        recorder.StopRecording();
        // stop playback
        player.Stop();
        // finalise the WAV file
        savingWaveProvider.Dispose();
    }


}



/// <summary>
/// Utility class to intercept audio from an IWaveProvider and
/// save it to disk
/// </summary>
public class WaveRecorder : IWaveProvider, IDisposable
{
    private WaveFileWriter writer;
    private IWaveProvider source;

    /// <summary>
    /// Constructs a new WaveRecorder
    /// </summary>
    /// <param name="destination">The location to write the WAV file to</param>
    /// <param name="source">The source Wave Provider</param>
    public WaveRecorder(IWaveProvider source, string destination)
    {
        this.source = source;
        this.writer = new WaveFileWriter(destination, source.WaveFormat);
    }

    /// <summary>
    /// Read simply returns what the source returns, but writes to disk along the way
    /// </summary>
    public int Read(byte[] buffer, int offset, int count)
    {
        int bytesRead = source.Read(buffer, offset, count);
        writer.WriteData(buffer, offset, bytesRead);
        return bytesRead;
    }

    /// <summary>
    /// The WaveFormat
    /// </summary>
    public WaveFormat WaveFormat
    {
        get { return source.WaveFormat; }
    }

    /// <summary>
    /// Closes the WAV file
    /// </summary>
    public void Dispose()
    {
        if (writer != null)
        {
            writer.Dispose();
            writer = null;
        }
    }
}

}

Answer 1

Hi @kobosh ,
As far as I think, asp.net on its own is not suited for this kind of application. If you want users to be able to record audio on your website, you could take a look at Silverlight 4.0 (vid).

See also this question: Recording Audio From Web Page.

Best regards,
Yijing Sun

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