vb.net音频波形 波形文件声道数

怎么在VB.NET中画.wave文件的波形图

代码原理如下：

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读取.wave

播放.wave

在播放的同时根据波形数据生成图形显示出来。

VB.NET问题，做一个定时响铃提醒程序，怎样在程序中引用铃音，请写写代码，是在timer中添加代码吗

把类似下面的三行代码放入timer即可。关键是放音程序。

DealWav.mciSendString "open " sA " alias wav", sB, Len(sB), 0

DealWav.mciSendString "play wav ", sB, Len(sB), 0

DealWav.mciSendString "close wav ", sB, Len(sB), 0

送你DealWav模块

Dim WAVBuffer() As Byte

Dim DataLenOut As Long

Dim Datapos1 As Long

Dim Datapos2 As Long

Dim ChunkLen As Long

Dim factpos As Long

Type PCMWAVEFORMAT '标准 PCM 格式定义

wFormatTag As Integer '格式标志，区分不同的格式，PCM 为 1

nChannels As Integer '音频通道数，单声道为 1 ，立体声为 2

nSamplesPerSec As Long '每秒的采样数，即采样率。

'标准的采样率有8.000 kHz 、11.025 kHz 、

'22.050 kHz 、44.100 kHz 等。

nAvgBytesPerSec As Long '每秒的字节数，即数据率。

'数据率 = 通道数×采样率×采样大小 / 8

nBlockAlign As Integer '块对齐，即波形数据的最小单位。

'块对齐 = 通道数×采样大小 / 8

wBitsPerSample As Integer '每个采样所占的位数，即采样大小。

'采样大小有 8 位和 16 位两种。

End Type

Private Type WaveHead

strRiff As String * 4 ' 00H 4 char "RIFF"标志

lngFileLen As Long ' 04H 4 long int 文件长度

strWave As String * 4 ' 08H 4 char "WAVE"标志

strFmt As String * 4 ' 0CH 4 char "fmt"标志

lngTmp As Long ' 10H 4 　 过渡字节（不定）

intFormat As Integer ' 14H 2 int 格式类别（10H为PCM形式的声音数据)

intChan As Integer ' 16H 2 int 通道数，单声道为1，双声道为2

intFreq As Long ' 18H 2 int 采样率（每秒样本数），表示每个通道的播放速度，

lngSendSpeed As Long ' 1CH 4 long int 波形音频数据传送速率，其值为通道数×每秒数据位数×每样本的数据位数／8。播放软件利用此值可以估计缓冲区的大小。

intBlock As Integer ' 20H 2 int 数据块的调整数（按字节算的），其值为通道数×每样本的数据位值／8。播放软件需要一次处理多个该值大小的字节数据，以便将其值用于缓冲区的调整。

intBit As Integer ' 22H 2 　 每样本的数据位数，表示每个声道中各个样本的数据位数。如果有多个声道，对每个声道而言，样本大小都一样。

strData As String * 4 ' 24H 4 char 数据标记符＂data＂

lngDataLenth As Long ' 28H 4 long int 语音数据的长度

End Type

Public Declare Function sndPlaySound Lib "winmm" Alias "sndPlaySoundA" (ByVal lpszSoundName As String, ByVal uFlags As Long) As Long

' flag uitzetten

Public Const SND_SYNC = H0

Public Const SND_ASYNC = H1

Public Const SND_NODEFAULT = H2

Public Const SND_MEMORY = H4

Public Const SND_LOOP = H8

Public Const SND_NOSTOP = H10

Private Declare Function PlaySound Lib "winmm.dll" Alias "PlaySoundA" (ByVal lpszName As String, ByVal hModule As Long, ByVal dwFlags As Long) As Long

Public Declare Function mciSendString Lib "winmm.dll" Alias "mciSendStringA" (ByVal lpstrCommand As String, ByVal lpstrReturnString As String, ByVal uReturnLength As Long, ByVal hwndCallback As Long) As Long

Public Declare Function mciExecute Lib "winmm.dll" (ByVal lpstrCommand As String) As Long

'Declare Function PlaySound Lib "winmm.dll" Alias "PlaySoundA" (ByVal lpszName As String, ByVal hModule As Long, ByVal dwFlags As Long) As Long

Public Declare Sub RtlMoveMemory Lib "kernel32" (lpvDest As Any, lpvSource As Any, ByVal cbCopy As Long)

Private Sub Command1_Click()

'为了防止随意选取的两个wav文件格式不同，我干脆就将同一个文件重复两次

LinkWav "C:\WINNT\Media\ringout.wav", "C:\WINNT\Media\ringout.wav", "f:\temp.wav"

End Sub

Private Function getWavHead(strFileName As String) As WaveHead

'获取文件头

Dim iFreeFile

iFreeFile = FreeFile()

On Error GoTo ErrHandle

Dim MyHead As WaveHead

Open strFileName For Binary As #iFreeFile

Get #iFreeFile, , MyHead

Close #iFreeFile

getWavHead = MyHead

ErrHandle:

End Function

Public Function LinkWav(strFileName1 As String, strFileName2 As String, strOutFile As String) As Boolean

Dim headFirst As WaveHead

Dim headNext As WaveHead

Dim headNew As WaveHead '新文件的头

Dim Data1() As Byte

Dim Data2() As Byte

Dim i As Long

LinkWav = False

'获取头

headFirst = getWavHead(strFileName1)

headNext = getWavHead(strFileName2)

'文件头比较

DoEvents '这里应该对两个头作比较，如果采样率，声道数等等不一致的话不能进行连接

'偶就偷懒不做这个校验啦，如果要实际应用千万要完成这一块的代码

'创建新头

headNew = headFirst '先拷贝一个头过来

headNew.lngFileLen = headFirst.lngDataLenth + headNext.lngDataLenth + 37

'文件长度等于两个文件的数据长度相加再加上头的长度，为什么是37呢？我也不明白！头的总长度是44，去掉4个字节的riff标志和4个字节的文件长度也应该是36哇。可是你打开一个wav文件把文件长度字段减去数据长度字段，就是活见鬼的37。我想了好久总想不通最后妥协直接写了个37在这里！:(

headNew.lngDataLenth = headFirst.lngDataLenth + headNext.lngDataLenth

'数据段的长度就是两个文件的数据相加啦

'下面是文件操作，为了加快编码速度减少脑细胞损伤，下面的代码效率很低，大家自己优化啦，如果直接用下面的代码劝大家不要读太大的文件，很够呛哦~~

'把两个文件的数据读出来！！

ReDim Data1(headFirst.lngDataLenth - 1)

'Open strFileName1 For Random As #1 Len = 1

Open strFileName1 For Binary As #1

For i = 0 To headFirst.lngDataLenth - 1

Get #1, 45 + i, Data1(i)

Next

Close #1

ReDim Data2(headNext.lngDataLenth - 1)

'Open strFileName2 For Random As #1 Len = 1

Open strFileName2 For Binary As #1 'Len = 1

For i = 0 To headNext.lngDataLenth - 1

Get #1, 45 + i, Data2(i)

Next

Close #1

'开始写数据啦

'Open strOutFile For Random As #1 Len = 1

Open strOutFile For Binary As #1

Put #1, , headNew ' 将头写入文件中。

'Close #1

'Open strOutFile For Random As #1 Len = 1

For i = 0 To UBound(Data1)

Put #1, 45 + i, Data1(i) ' 将第一个记录写入文件中。

Next

For i = 0 To UBound(Data2)

Put #1, , Data2(i) ' 将第一个记录写入文件中。

Next

Close #1 ' 关闭文件。

End Function

'合并两个WAV声音文件

Public Function WavMerge(Wave1() As Byte, Wave2() As Byte) As Variant

Dim xx As Long

Dim Y$

'1，确定data chunk的起始点(不同的WAV文件可能会不尽相同)

Do While Y$ "data"

Y$ = Chr(Wave1(xx)) Chr(Wave1(xx + 1)) Chr(Wave1(xx + 2)) Chr(Wave1(xx + 3))

xx = xx + 1

If xx 1000 Then

MsgBox "未知格式"

Exit Function

End If

Loop

Datapos1 = (xx - 1) + 8

xx = 0

Y$ = ""

Do While Y$ "data"

Y$ = Chr(Wave2(xx)) Chr(Wave2(xx + 1)) Chr(Wave2(xx + 2)) Chr(Wave2(xx + 3))

xx = xx + 1

If xx 1000 Then

MsgBox "未知格式"

Exit Function

End If

Loop

Datapos2 = (xx - 1) + 8

xx = 0

Y$ = ""

'2,确定第一个参数Wave1声音中是否包含可选的fact chunk

factpos = 0

Do While Y$ "fact"

Y$ = Chr(Wave1(xx)) Chr(Wave1(xx + 1)) Chr(Wave1(xx + 2)) Chr(Wave1(xx + 3))

xx = xx + 1

If xx 1000 Then

xx = 0

Exit Do

End If

Loop

factpos = xx - 1

If factpos = -1 Then factpos = 36

DataLenOut = UBound(Wave1) + 1 - Datapos1 + UBound(Wave2) + 1 - Datapos2

ReDim WAVBuffer(factpos + 19 + DataLenOut)

'3,写入合并后的RIFF('wave'...fmt...[fact]...头信息

RtlMoveMemory WAVBuffer(0), Wave1(0), factpos '注：采样速率，平均数据速率，采样大小，声道以Wave1参数为准

WAVBuffer(factpos) = Asc("f"): WAVBuffer(factpos + 1) = Asc("a")

WAVBuffer(factpos + 2) = Asc("c"): WAVBuffer(factpos + 3) = Asc("t")

ChunkLen = 4

RtlMoveMemory WAVBuffer(factpos + 4), ChunkLen, 4

RtlMoveMemory WAVBuffer(factpos + 8), DataLenOut, 4

WAVBuffer(factpos + 12) = Asc("d"): WAVBuffer(factpos + 13) = Asc("a")

WAVBuffer(factpos + 14) = Asc("t"): WAVBuffer(factpos + 15) = Asc("a")

RtlMoveMemory WAVBuffer(factpos + 16), DataLenOut, 4

'4,写入合并后的data chunk（即所有的samples,先Wave1,后Wave2)

RtlMoveMemory WAVBuffer(factpos + 20), Wave1(Datapos1), UBound(Wave1) - Datapos1 + 1

RtlMoveMemory WAVBuffer(factpos + 20 + UBound(Wave1) - Datapos1 + 1), Wave2(Datapos2), UBound(Wave2) - Datapos2 + 1

'5,更正RIFF头信息

ChunkLen = UBound(WAVBuffer) - 7

RtlMoveMemory WAVBuffer(4), ChunkLen, 4

'6,结束

WavMerge = WAVBuffer

End Function

'合并多个文件

Public Function f_LinkWav(cFile As Collection, sOutFile As String) As Boolean

Dim headFirst As WaveHead

Dim headNext As WaveHead

Dim headNew As WaveHead '新文件的头

Dim byteData() As Byte

Dim iFreeFile As Integer

Dim i As Long

Dim j As Long

Dim iA

Dim lData As Long

f_LinkWav = False

iFreeFile = FreeFile()

'获取头

headFirst = getWavHead(cFile(1))

lData = headFirst.lngDataLenth - 1

ReDim Preserve byteData(lData)

'Open strFileName1 For Random As #1 Len = 1

Open cFile(1) For Binary As #iFreeFile

For i = 0 To lData

Get #iFreeFile, 45 + i, byteData(i)

Next

Close #iFreeFile

headNew = headFirst

headNew.lngFileLen = headFirst.lngDataLenth

headNew.lngDataLenth = headFirst.lngDataLenth

For iA = 2 To cFile.Count

headNext = getWavHead(cFile(iA))

headNew.lngFileLen = headNew.lngFileLen + headNext.lngDataLenth + 37

headNew.lngDataLenth = headNew.lngDataLenth + headNext.lngDataLenth

ReDim Preserve byteData(lData + headNext.lngDataLenth)

Open cFile(iA) For Binary As #iFreeFile 'Len = 1

For i = 1 To headNext.lngDataLenth

Get #iFreeFile, 44 + i, byteData(lData + i)

Next

Close #iFreeFile

lData = lData + headNext.lngDataLenth

Next

'开始写数据啦

'Open strOutFile For Random As #1 Len = 1

If Dir(sOutFile, vbNormal) "" Then Kill sOutFile

Open sOutFile For Random As #iFreeFile

Put #iFreeFile, , headNew ' 将头写入文件中。

Close #iFreeFile

j = UBound(byteData) + 1

'For iA = 2 To giCalltimes

' ReDim Preserve byteData(UBound(byteData) + j)

' For i = 0 To j - 1

' byteData(j + i) = byteData(i) ' 将第一个记录写入文件中。

' Next

'Next iA

Open sOutFile For Random As #iFreeFile Len = 1

For i = 0 To UBound(byteData)

Put #iFreeFile, 45 + i, byteData(i) ' 将第一个记录写入文件中。

Next

' j = UBound(byteData)

'For iA = 2 To giCalltimes

' For i = 0 To UBound(byteData)

' Put #iFreeFile, 45 + i + j + 1, byteData(i) ' 将第一个记录写入文件中。

' Next

' j = j + UBound(byteData)

'Next

Close #iFreeFile ' 关闭文件。

f_LinkWav = True

End Function

Public Function f_MciChkEnd()

Dim MCIStatus As String * 255

Dim lA

f_MciChkEnd = False

lA = mciSendString("status wav mode", MCIStatus, Len(MCIStatus), 0)

If UCase(Left$(MCIStatus, 7)) = "STOPPED" Or Left$(MCIStatus, 2) = "结束" Then f_MciChkEnd = True

End Function

Public Function SendComReturnString(com As String) As String

Dim FeedBack As Long, ReturnString As String * 255

ReturnString = String(255, Chr(0))

FeedBack = mciSendString(com, ReturnString, 255, 0)

If FeedBack Then

Dim s As String * 255

'mciGetErrorString FeedBack, s, 255

SendComReturnString = vbNullString

Else

SendComReturnString = Left(ReturnString, InStr(1, ReturnString, Chr(0)) - 1)

End If

End Function

VB.net如何加载音效？

方法一：调用系统DLL（这个有点不完善，也就是播放声音时窗体无法控制，效果相当于Enabled=true，但音频播放完毕后就没事了）

Private Declare Function sndPlaySound Lib "Winmm.dll" Alias "sndPlaySoundA" (ByVal lpszSoundName As String, ByVal uFlags As Long) As Long

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim SoundFile As String, Result As Long

SoundFile = "D:\KuGou\Pianoboy - 第105天.wav" '此处为路径

Result = sndPlaySound(SoundFile, 0)

End Sub

方法二：使用WindowsMediaPlayer（WindowsMediaPlayer1的可见为False）

先添加一个windowsmediaplayer控件（工具箱里没有，需要手动添加）

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

WindowsMediaPlayer1.visible=False

Me.WindowsMediaPlayer1.URL = "D:\KuGou\Pianoboy - 第105天.mp3"

End Sub

上面的都是点击button1（按钮1）后播放声音，若是鼠标移动到某控件上发出声音的话改一下触发事件就OK了。

vb.net怎么编程实现从音频输出口输出指定频率指定时长和占空比的单音信号。

1.用Win32 API PlaySound

PlaySound位于"winmm.dll"中，可以根据输入参数的不同，播放WAV类型的音乐。在VB.NET中调用跟VB6中差不多：

先声明：

Private Declare Auto Function PlaySound Lib "winmm.dll" (ByVal lpszSoundName As String, ByVal hModule As Integer, ByVal dwFlags As Integer) As Integer

Const SND_FILENAME As Integer = H20000

Const SND_ALIAS As Integer = H10000

Const SND_SYNC As Integer = H0

具体还有很多常量，不一一列举，下面是播放一个wav文件的例子

Dim mstrfileName As String = "c:\eagle2.wav"

PlaySound(mstrfileName, 0, SND_FILENAME)

注意上面的播放是非同步的，就是说它并不会播放完毕才结束。如果把上面的代码写在一个Button.Click的事件处理程序中，第二次点击的时候它会打断第一次的播放，重新开始。

当然我们也可以调用系统的声音：

PlaySound("SystemStart", 0, SND_ALIAS Or SND_SYNC)

' 以同步的方式调用系统启动时候的声音。

2． 调用媒体播放器控件

VB.NET中并没有提供媒体播放器的.NET组件，没办法我们还是调用以前Com组件Windows Media Player。当然除了声音外，还可以播放视频文件。

首先把媒体播放器控件加到工具栏中，调用还是简单的写一下吧：）

Private Sub playMediaFile(ByVal mediaFileName As String)

With MediaPlayer1

.Stop()

.FileName = "c:\mp3\爱不爱我.mp3"

.Play()

End With

End Sub

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