NAudioで信号処理 (その６)

NAudioで信号処理 (目次) - Hope is a Dream. Dream is a Hope.

NAudioで信号処理 (その６)

録音デバイスの選択と、再生

C# Audio Tutorial 6 - Audio Loopback using

やっとデバイスの選択方法がでてきました。まずは録音デバイスということで入力側のデバイスの一覧を取得し、ListViewに表示します。

// SetUp WaveIn Devices
List<WaveInCapabilities> sources = new List<WaveInCapabilities>();

for (int i = 0; i < WaveIn.DeviceCount; i++)
{
    sources.Add(WaveIn.GetCapabilities(i));
}

listView_Sources.Items.Clear();

foreach (var source in sources)
{
    ListViewItem item = new ListViewItem(source.ProductName);
    item.SubItems.Add(new ListViewItem.ListViewSubItem(item, source.Channels.ToString()));

    listView_Sources.Items.Add(item);
}

オーディオチェーンは以下のようになります。

#region Member
private NAudio.Wave.WaveIn sourceStream = null; // 録音なのでWaveInを使用
private NAudio.Wave.DirectSoundOut waveOut = null;
#endregion


private void button_Start_Click(object sender, EventArgs e)
{
    if (listView_Sources.SelectedItems.Count == 0) return;

    int deviceNumber = listView_Sources.SelectedItems[0].Index;

    // waveIn Select Recording Device
    sourceStream = new NAudio.Wave.WaveIn();
    sourceStream.DeviceNumber = deviceNumber; // 使用するデバイスを選択
    sourceStream.WaveFormat = new NAudio.Wave.WaveFormat(44100, WaveIn.GetCapabilities(deviceNumber).Channels); 
    
    // WaveInProviderで包み込む
    WaveInProvider waveIn = new NAudio.Wave.WaveInProvider(sourceStream); // ?

    // waveOut
    waveOut = new DirectSoundOut();
    waveOut.Init(waveIn);

    sourceStream.StartRecording();
    waveOut.Play();

}

using System;
using System.Windows.Forms;
using NAudio.Wave;
using System.Collections.Generic;

namespace Tutorial
{
    public partial class Form1 : Form
    {
        #region form
        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// フォームの初期設定。
        /// </summary>
        private void Form1_Load(object sender, EventArgs e)
        {
            // ボタンの初期状態
            this.Text = @"Tutorial 5";
            linkLabel1.Text = "https://www.youtube.com/watch?v=CFUBse8Rjko";
        }

        /// <summary>
        /// フォームのクロージング処理
        /// Wave関連オブジェクトのDispose処理を担当
        /// </summary>
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
        }

        #endregion


        private void button_Refresh_Click(object sender, EventArgs e)
        {

            // SetUp WaveIn Devices
            List<WaveInCapabilities> sources = new List<WaveInCapabilities>();

            for (int i = 0; i < WaveIn.DeviceCount; i++)
            {
                sources.Add(WaveIn.GetCapabilities(i));
            }

            listView_Sources.Items.Clear();

            foreach (var source in sources)
            {
                ListViewItem item = new ListViewItem(source.ProductName);
                item.SubItems.Add(new ListViewItem.ListViewSubItem(item, source.Channels.ToString()));

                listView_Sources.Items.Add(item);
            }

        }

        #region Member
        private NAudio.Wave.WaveIn sourceStream = null;
        private NAudio.Wave.DirectSoundOut waveOut = null;
        #endregion


        private void button_Start_Click(object sender, EventArgs e)
        {
            if (listView_Sources.SelectedItems.Count == 0) return;

            int deviceNumber = listView_Sources.SelectedItems[0].Index;

            // waveIn Select Recording Device
            sourceStream = new NAudio.Wave.WaveIn();
            sourceStream.DeviceNumber = deviceNumber;
            sourceStream.WaveFormat = new NAudio.Wave.WaveFormat(44100, WaveIn.GetCapabilities(deviceNumber).Channels);

            WaveInProvider waveIn = new NAudio.Wave.WaveInProvider(sourceStream); // ?

            // waveOut
            waveOut = new DirectSoundOut();
            waveOut.Init(waveIn);

            sourceStream.StartRecording();
            waveOut.Play();

        }

        private void button_Stop_Click(object sender, EventArgs e)
        {
            waveOut?.Stop();
            waveOut?.Dispose();
            waveOut = null;

            sourceStream?.StopRecording();
            sourceStream?.Dispose();
            sourceStream = null;
        }

        private void button_Exit_Click(object sender, EventArgs e)
        {
            button_Stop_Click(sender, e);
            this.Close();
        }
    }

}