用VB编写读取mp3音频并显示频谱的代码
时间: 2023-09-11 14:05:15 浏览: 447
### 回答1:
你好,这里是一段可以使用 Visual Basic (VB) 编写的读取 MP3 音频并显示频谱的代码。
首先,在你的 VB 项目中添加一个按钮,并将下面的代码添加到按钮的单击事件处理程序中。
```vb
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
' 读取 MP3 文件
Dim filePath As String = "C:\path\to\your\audio.mp3"
Dim audio As Byte() = File.ReadAllBytes(filePath)
' 创建 FFT 对象
Dim fft As New FFT()
' 获取频谱数据
Dim spectrum As Single() = fft.GetSpectrumData(audio)
' 在图表中显示频谱数据
Dim chart As New Chart()
chart.Series.Add("Spectrum")
For i As Integer = 0 To spectrum.Length - 1
chart.Series("Spectrum").Points.AddY(spectrum(i))
Next
End Sub
```
在上面的代码中,我们使用了 `FFT` 类来获取频谱数据。这个类需要你自己实现,具体实现方法可以参考这篇文章: https://www.cnblogs.com/ZhouYi/p/4536809.html。
然后,我们将获取的频谱数据添加到图表中,并使用图表控件来显示频谱。
我希望这段代码能够对你有所帮助。如果你有其他问题,请随时联系我。
### 回答2:
下面是用VB编写读取mp3音频并显示频谱的简单代码示例:
```
Imports NAudio.Wave
Imports System.Drawing
Public Class MainForm
Inherits Form
Dim audioFile As String = "audio.mp3"
Dim sampleProvider As ISampleProvider
Dim fftSize As Integer = 4096
Protected Overrides Sub OnLoad(e As EventArgs)
' 初始化NAudio WaveStream以及SampleProvider
Dim waveStream As WaveStream = New Mp3FileReader(audioFile)
sampleProvider = waveStream.ToSampleProvider()
' 设置FFT处理器以及获取频谱数据
Dim fftProcessor As New FFTProcessor(sampleProvider.WaveFormat.SampleRate, fftSize)
Dim spectrumData As List(Of Single()) = fftProcessor.GetSpectrumData(waveStream)
' 绘制频谱图
Dim pictureBox As New PictureBox()
pictureBox.Location = New Point(10, 10)
pictureBox.Size = New Size(Me.ClientSize.Width - 20, Me.ClientSize.Height - 20)
pictureBox.Image = DrawSpectrum(spectrumData, pictureBox.Size)
Me.Controls.Add(pictureBox)
MyBase.OnLoad(e)
End Sub
Private Function DrawSpectrum(spectrumData As List(Of Single()), size As Size) As Bitmap
Dim bitmap As New Bitmap(size.Width, size.Height)
Dim graphics As Graphics = Graphics.FromImage(bitmap)
Dim xScale As Single = size.Width / spectrumData.Count
Dim yScale As Single = size.Height / (fftSize / 2)
For i As Integer = 0 To spectrumData.Count - 1
For j As Integer = 0 To fftSize / 2 - 1
Dim intensity As Single = spectrumData(i)(j)
Dim color As Color = Color.FromArgb(CInt(intensity * 255), 0, 0)
graphics.FillRectangle(New SolidBrush(color), i * xScale, size.Height - j * yScale, xScale, yScale)
Next
Next
graphics.Dispose()
Return bitmap
End Function
End Class
Public Class FFTProcessor
Dim sampleRate As Integer
Dim fftSize As Integer
Public Sub New(sampleRate As Integer, fftSize As Integer)
Me.sampleRate = sampleRate
Me.fftSize = fftSize
End Sub
Public Function GetSpectrumData(waveStream As WaveStream) As List(Of Single())
Dim buffer As New List(Of Single())
Dim sampleBuffer(fftSize - 1) As Single
Dim fft As New FFT(fftSize)
Do While waveStream.Position < waveStream.Length
Dim read As Integer = waveStream.Read(sampleBuffer, 0, fftSize)
If read > 0 Then
Dim fftData() As Single = fft.ComputeFFT(sampleBuffer)
buffer.Add(fftData)
End If
Loop
Return buffer
End Function
End Class
Public Class FFT
Dim fftSize As Integer
Public Sub New(fftSize As Integer)
Me.fftSize = fftSize
End Sub
Public Function ComputeFFT(input As Single()) As Single()
Dim fftData(fftSize / 2 - 1) As Single
' FFT处理代码
Return fftData
End Function
End Class
```
以上代码使用了NAudio库来读取mp3音频文件,并通过FFT处理器计算频谱数据。然后通过绘制频谱图的方法将频谱数据绘制到一个PictureBox控件上。代码中的FFT处理器只是简单示例,实际应用中可能需要根据具体需求进行调整。
### 回答3:
使用VB编写读取mp3音频并显示频谱的代码可以通过以下步骤实现:
1. 首先,需要在VB项目中添加对NAudio库的引用。在Visual Studio中,右键点击项目名称,选择“添加”>“引用”,然后找到NAudio并添加引用。
2. 创建一个新的窗体,并在窗体上添加一个扩展了PictureBox的控件,用于显示频谱。
3. 在窗体的代码中引入NAudio库的命名空间:`Imports NAudio.Wave`
4. 声明一个私有变量`wavePlayer`作为音频播放器:`Private wavePlayer As WaveOut`
5. 添加一个按钮或其他触发事件的控件,并在事件处理程序中编写以下代码:
```vb
Private Sub btnOpen_Click(sender As Object, e As EventArgs) Handles btnOpen.Click
Dim openFileDialog As New OpenFileDialog()
openFileDialog.Filter = "MP3 Files|*.mp3"
openFileDialog.Title = "选择音频文件"
If openFileDialog.ShowDialog() = DialogResult.OK Then
' 创建一个读取mp3的音频流
Dim audioFileReader As New AudioFileReader(openFileDialog.FileName)
' 创建一个32位浮点数的音频流,用于分析频谱
Dim sampleProvider As New SampleChannel(audioFileReader)
' 创建音频播放器
wavePlayer = New WaveOut()
' 注册一个事件,当播放完毕后停止播放器
AddHandler wavePlayer.PlaybackStopped, AddressOf WavePlayer_PlaybackStopped
' 将音频流连接到播放器
wavePlayer.Init(sampleProvider)
' 启动音频播放器
wavePlayer.Play()
' 在图像框中显示频谱
ShowSpectrum(sampleProvider)
End If
End Sub
Private Sub ShowSpectrum(sampleProvider As ISampleProvider)
Dim fftSize As Integer = 8192 ' 设置FFT的大小
Dim spectrumData(fftSize / 2 - 1) As Single ' 用于存储频谱数据
' 创建一个曲线,用于显示频谱
Dim spectrumCurve As New NAudio.Dsp.FastFourierTransform(
fftSize, NAudio.Dsp.FFTWindow.Hamming)
While wavePlayer.PlaybackState = PlaybackState.Playing
' 从音频流中读取指定长度的采样数据
Dim buffer(sampleProvider.WaveFormat.SampleRate *
sampleProvider.WaveFormat.Channels) As Single
sampleProvider.Read(buffer, 0, buffer.Length)
' 分析频谱
spectrumCurve.Magnitude(buffer, spectrumData)
' 在图像框中显示频谱数据
spectrumPictureBox.Image = DrawSpectrum(spectrumData)
Application.DoEvents() ' 处理其他事件
End While
End Sub
Private Function DrawSpectrum(spectrumData() As Single) As Image
Dim width As Integer = spectrumPictureBox.Width
Dim height As Integer = spectrumPictureBox.Height
Dim image As New Bitmap(width, height)
Dim graphics As Graphics = Graphics.FromImage(image)
' 绘制频谱曲线
For i As Integer = 0 To spectrumData.Length - 1
Dim barHeight As Integer = CInt(height * spectrumData(i))
graphics.DrawLine(Pens.Black, i, height, i, height - barHeight)
Next
graphics.Dispose()
Return image
End Function
Private Sub WavePlayer_PlaybackStopped(sender As Object, e As StoppedEventArgs)
' 停止频谱显示
spectrumPictureBox.Image = Nothing
End Sub
```
以上代码通过NAudio库读取MP3音频文件并从音频流中获取采样数据,然后使用快速傅里叶变换(FFT)分析采样数据获得频谱数据,并将频谱数据可视化显示在PictureBox控件上。同时,创建了一个音频播放器用于播放音频文件,并在播放完毕后停止播放器。
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