form1.frm

将11520采样率(可用cooledit得到)的wav文件转换为可供串口播放的PWM文件

VERSION 5.00
Object = "{F9043C88-F6F2-101A-A3C9-08002B2F49FB}#1.2#0"; "comdlg32.ocx"
Object = "{831FDD16-0C5C-11D2-A9FC-0000F8754DA1}#2.0#0"; "mscomctl.ocx"
Begin VB.Form Form1 
   Caption         =   "RS232 PWM file maker"
   ClientHeight    =   870
   ClientLeft      =   60
   ClientTop       =   360
   ClientWidth     =   6150
   LinkTopic       =   "Form1"
   ScaleHeight     =   870
   ScaleWidth      =   6150
   StartUpPosition =   3  '窗口缺省
   Begin MSComctlLib.ProgressBar ProgressBar1 
      Height          =   375
      Left            =   0
      TabIndex        =   2
      Top             =   480
      Width           =   6135
      _ExtentX        =   10821
      _ExtentY        =   661
      _Version        =   393216
      Appearance      =   1
   End
   Begin VB.CommandButton Command2 
      Caption         =   "Convert to PWM file"
      Height          =   495
      Left            =   3120
      TabIndex        =   1
      Top             =   0
      Width           =   3015
   End
   Begin MSComDlg.CommonDialog CommonDialog2 
      Left            =   3480
      Top             =   0
      _ExtentX        =   847
      _ExtentY        =   847
      _Version        =   393216
      CancelError     =   -1  'True
   End
   Begin MSComDlg.CommonDialog CommonDialog1 
      Left            =   3000
      Top             =   0
      _ExtentX        =   847
      _ExtentY        =   847
      _Version        =   393216
      CancelError     =   -1  'True
   End
   Begin VB.CommandButton Command1 
      Caption         =   "Open 11520sps stereo WAV file"
      Height          =   495
      Left            =   0
      TabIndex        =   0
      Top             =   0
      Width           =   3015
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim taskhandle As Long
Dim sampsPerChanWritten As Long
Dim databf() As Integer
Dim data() As Byte
Dim head(43) As Byte
Dim sizef As Long
Dim sizel As Long
Dim bitx(9) As Byte
Dim s As Double
Dim x As Double
Dim leng As Long
Private Sub Command1_Click()
On Error GoTo ex1
CommonDialog1.ShowOpen
If CommonDialog1.FileName = "" Then Exit Sub
Open CommonDialog1.FileName For Binary As #1
Get #1, , head()
sizef = head(24) + CLng(head(25)) * 256
sizel = head(4) + CLng(head(5)) * 256 + CLng(head(6)) * 65536 + CLng(head(7)) * 65536 * 256
If sizef <> 11520 Then
MsgBox ("请使用采样率为11520Hz的立体声WAV格式")
Exit Sub
End If
leng = (sizel - 36) / 4
Close #1
ex1:
End Sub

Private Sub Command2_Click()
On Error GoTo ex2
CommonDialog2.ShowSave
If CommonDialog1.FileName = "" Then Exit Sub
Open CommonDialog1.FileName For Binary As #1
Get #1, , head()
sizef = head(24) + CLng(head(25)) * 256
sizel = head(4) + CLng(head(5)) * 256 + CLng(head(6)) * 65536 + CLng(head(7)) * 65536 * 256
ReDim databf((sizel - 36) / 2)
ReDim data((sizel - 36) / 4)
Get #1, , databf()
Close #1
For i = 0 To (sizel - 36) / 2 - 1 Step 2
x = (CDbl(databf(i)) + CDbl(databf(i + 1))) / 2
kk = x / 3641 + 9
data(i / 2) = bitx(CLng(kk / 2))
data(i / 2 + 1) = bitx(CLng(kk - CLng(kk / 2)))
ProgressBar1.Value = i * 200 / (sizel - 36)
Next i
If CommonDialog2.FileName = "" Then Exit Sub
Open CommonDialog2.FileName For Binary As #1
Put #1, , data()
Close #1
ex2:
End Sub

Private Sub Form_Load()
CommonDialog1.FileName = ""
CommonDialog2.FileName = ""
s = 0
bitx(0) = &HFF
bitx(1) = &HEF
bitx(2) = &HBB
bitx(3) = &H6B
bitx(4) = &H55
bitx(5) = &H4A
bitx(6) = &H22
bitx(7) = &H8
bitx(8) = &H0
End Sub