NAudioで信号処理 (その７)

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

NAudioで信号処理 (その７)

録音デバイスの選択と、再生

C# Audio Tutorial 6 - Audio Loopback using

Tutorial6では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。

Tutorial7では、録音デバイスからのオーディオストリームを、Waveファイルへ書き込みます。

オーディオチェーンは以下のようになります。

WaveIn(rec) -> Callback() -> waveWriter

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

    // オーディオチェーン : WaveIn(rec) -> Callback() -> waveWriter 

    // 録音先のWavファイル
    SaveFileDialog save = new SaveFileDialog();
    save.Filter = "Wave File (*.wav)|*.wav;";
    if (save.ShowDialog() != DialogResult.OK) return;

    // 録音デバイス番号
    int deviceNumber = listView_Sources.SelectedItems[0].Index;

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

    // 録音のコールバック
    sourceStream.DataAvailable += new EventHandler<WaveInEventArgs>(sourceStream_DataAvailable);

    // wave出力
    waveWriter = new WaveFileWriter(save.FileName, sourceStream.WaveFormat);

    // 録音開始
    sourceStream.StartRecording();

}
private void sourceStream_DataAvailable(object sender, WaveInEventArgs e)
{
    if (waveWriter == null) return;
    // Waveファイルへ書き込み
    waveWriter.Write(e.Buffer, 0, e.BytesRecorded);
    waveWriter.Flush();
}

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;
        private NAudio.Wave.WaveFileWriter waveWriter = null;
        #endregion


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

            // オーディオチェーン : WaveIn(rec) -> WaveInProvider -> WaveOut(DirectSoundOut)

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

            // オーディオチェーン : WaveIn(rec) -> Callback() -> waveWriter 

            // 録音先のWavファイル
            SaveFileDialog save = new SaveFileDialog();
            save.Filter = "Wave File (*.wav)|*.wav;";
            if (save.ShowDialog() != DialogResult.OK) return;

            // 録音デバイス番号
            int deviceNumber = listView_Sources.SelectedItems[0].Index;

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

            // 録音のコールバックkな数
            sourceStream.DataAvailable += new EventHandler<WaveInEventArgs>(sourceStream_DataAvailable);

            // wave出力
            waveWriter = new WaveFileWriter(save.FileName, sourceStream.WaveFormat);

            // 録音開始
            sourceStream.StartRecording();

        }
        private void sourceStream_DataAvailable(object sender, WaveInEventArgs e)
        {
            if (waveWriter == null) return;

            waveWriter.Write(e.Buffer, 0, e.BytesRecorded);
            waveWriter.Flush();
        }

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

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

            waveWriter?.Dispose();
            waveWriter = null;
        }

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


    }

}