C# NAudio 录制声音和显示波形图
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NAudio.Wave;
using System.IO;
namespace TestAudio
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private IWaveIn waveIn;
private WaveFileWriter writer;
List<float> sampleAggregator = new List<float>();//用来储存波形数据
private void btnStart\_Click(object sender, EventArgs e)
{
StartRecording();
}
/// <summary>
/// 开始录音
/// </summary>
private void StartRecording()
{
if (waveIn != null) return;
Text = "start recording....";
btnStart.Text = "正在录制....";
btnStart.Enabled = false;
waveIn = new WaveIn { WaveFormat = new WaveFormat(8000, 1) };//设置码率
writer = new WaveFileWriter("test.wav", waveIn.WaveFormat);
waveIn.DataAvailable += waveIn\_DataAvailable;
waveIn.RecordingStopped += OnRecordingStopped;
waveIn.StartRecording();
}
/// <summary>
/// 录音中
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void waveIn\_DataAvailable(object sender, WaveInEventArgs e)
{
writer.Write(e.Buffer, 0, e.BytesRecorded);
byte\[\] buffer = e.Buffer;
int bytesRecorded = e.BytesRecorded;
for (int index = 0; index < e.BytesRecorded; index += 2)
{
short sample = (short)((buffer\[index + 1\] << 8) |
buffer\[index + 0\]);
float sample32 = sample / 32768f;
sampleAggregator.Add(sample32);
}
int secondsRecorded = (int)(writer.Length / writer.WaveFormat.AverageBytesPerSecond);//录音时间获取
if (secondsRecorded >= 3)//只录制6秒
{
waveIn.StopRecording();
Text = "complete";
btnStart.Text = "开始录制";
btnStart.Enabled = true;
//------------------------------------开始画波形图。
Text = sampleAggregator.Min() + "," + sampleAggregator.Max();
int baseMidHeight = 50;
float h = 0;
for (int i = 0; i < sampleAggregator.Count; i+=60) {//大概意思意思 60的步长是怕太多了。
h= sampleAggregator\[i\] \* 300;
flowLayoutPanel1.Controls.Add(new Label() { BackColor = Color.Pink, Width = 5, Height = (int)h, Margin = new Padding(0, baseMidHeight-(int)h, 0, 0) });
}
//-----------------------------------------------------
}
}
/// <summary>
/// 停止录音
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnRecordingStopped(object sender, StoppedEventArgs e)
{
if (waveIn != null) // 关闭录音对象
{
waveIn.Dispose();
waveIn = null;
}
if (writer != null)//关闭文件流
{
writer.Close();
writer = null;
}
if (e.Exception != null)
{
MessageBox.Show(String.Format("出现问题 " + e.Exception.Message));
}
}
private void Form1\_Load(object sender, EventArgs e)
{
}
} }
WPF 例子：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using NAudio.Wave;
using System.Collections.ObjectModel;
using System.ComponentModel;
namespace TestAudioWPF
{
///
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
listView.DataContext = listView.ItemsSource = sampleAggregator;
}
private IWaveIn waveIn;
private WaveFileWriter writer;
ObservableCollection<WaveInfo> sampleAggregator = new ObservableCollection<WaveInfo> ();//用来储存波形数据
/// <summary>
/// 开始录音
/// </summary>
private void StartRecording()
{
if (waveIn != null) return;
Title = "start recording....";
btnStart.Content = "正在录制....";
btnStart.IsEnabled = false;
sampleAggregator.Clear();
waveIn = new WaveIn { WaveFormat = new WaveFormat(8000, 1) };//设置码率
writer = new WaveFileWriter("test.wav", waveIn.WaveFormat);
waveIn.DataAvailable += waveIn\_DataAvailable;
waveIn.RecordingStopped += OnRecordingStopped;
waveIn.StartRecording();
}
/// <summary>
/// 录音中
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void waveIn\_DataAvailable(object sender, WaveInEventArgs e)
{
writer.Write(e.Buffer, 0, e.BytesRecorded);
byte\[\] buffer = e.Buffer;
int bytesRecorded = e.BytesRecorded;
//------------------------------------开始画波形图。
sampleAggregator.Clear();//可以不清除，就会一直保持历史记录// short s = BitConverter.ToInt16(e.Buffer, 0);//这样采样比较少，反正是int16型的
// int w= Math.Abs(s / 50);
// sampleAggregator.Add(new WaveInfo() { heigth = w });
for (int index = 0; index < e.BytesRecorded; index += 2)
{
short sample = (short)((buffer\[index + 1\] << 8) |
buffer\[index + 0\]);
float sample32 = sample / 32768f;
if (sample32 > 0.03f)
{
sampleAggregator.Add(new WaveInfo() { heigth = sample32\*300f });
}
}
//---------------------------------------------------------
int secondsRecorded = (int)(writer.Length / writer.WaveFormat.AverageBytesPerSecond);//录音时间获取
if (secondsRecorded >= 552)//只录制552秒
{
waveIn.StopRecording();
Title = "complete";
btnStart.Content = "开始录制";
btnStart.IsEnabled = true;
}
}
/// <summary>
/// 停止录音
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnRecordingStopped(object sender, StoppedEventArgs e)
{
if (waveIn != null) // 关闭录音对象
{
waveIn.Dispose();
waveIn = null;
}
if (writer != null)//关闭文件流
{
writer.Close();
writer = null;
}
if (e.Exception != null)
{
MessageBox.Show(String.Format("出现问题 " + e.Exception.Message));
}
}
private void Form1\_Load(object sender, EventArgs e)
{
}
private void btnStart\_Click(object sender, RoutedEventArgs e)
{
StartRecording();
}
}
public class WaveInfo :INotifyPropertyChanged{
public event PropertyChangedEventHandler PropertyChanged;
private float \_heigth;
public float heigth
{
get {
return \_heigth;
}
set {
if (value != \_heigth)
{ \_heigth = value;
OnPropertyChanged("heigth");
}
}
}
private string text;
public string Text
{
get { return text; }
set { text = value; OnPropertyChanged("Text"); }
}
protected void OnPropertyChanged(string propertyName = "")
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}}
<Button x:Name="btnStart" Click="btnStart\_Click" Content="btnStart" HorizontalAlignment="Left" Margin="145,20,0,0" VerticalAlignment="Top" Width="169" Height="37"/>
<ListView BorderThickness="0" Name="listView" DataContext="sampleAggregator" Height="232" VerticalAlignment="Bottom">
<ListView.ItemTemplate>
<DataTemplate>
<Label Margin="0" Padding="0" Background="Pink" Width="2" Height="{Binding heigth}"></Label>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel IsItemsHost="True" ScrollViewer.HorizontalScrollBarVisibility="Auto" ScrollViewer.VerticalScrollBarVisibility="Disabled" Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
</ListView>
<WrapPanel ScrollViewer.HorizontalScrollBarVisibility="Auto" ScrollViewer.VerticalScrollBarVisibility="Disabled" Orientation="Horizontal" Height="70" VerticalAlignment="Bottom">
<Label Margin="0" Padding="0" Background="Pink" Width="2" Height="22"></Label>
<Label Margin="0" Padding="0" Background="Pink" Width="2" Height="33"></Label>
<Label Margin="0" Padding="0" Background="Pink" Width="2" Height="44"></Label>
</WrapPanel>
</Grid> 参考：
https://channel9.msdn.com/coding4fun/articles/AutotuneNET
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