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分享如何用低级音频函数播放Wav文件？
各位高手：
Windows低级音频函数如:WaveOpen,WAveClose,WaveInStart 等等可以播放Wav文件 ，但是首先要将Wav文件调入内存，我不知到如何将Wav文件调入内存.请问有什么方法吗？
谢谢！衷心感谢。
Windows低级音频函数如:WaveOpen,WAveClose,WaveInStart 等等可以播放Wav文件 ，但是首先要将Wav文件调入内存，我不知到如何将Wav文件调入内存.请问有什么方法吗？
谢谢！衷心感谢。
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dbcontrols 2002-02-19
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Dim rc As Long ' Return code
Dim hmmioIn As Long ' file handle
Dim dataOffset As Long ' start of audio data in wave file
Dim audioLength As Long ' number of bytes in audio data
Dim pFormat As Long ' pointer to wave format
Dim formatBuffer As String * 50 ' buffer to hold the wave format
Dim startPos As Long ' sample where we started playback from
Dim format As WAVEFORMAT ' waveformat structure
Dim I As Long ' loop control variable
Dim j As Long ' loop control variable
Dim hmem(1 To NUM_BUFFERS) As Long ' memory handles
Dim pmem(1 To NUM_BUFFERS) As Long ' memory pointers
Dim hdr(1 To NUM_BUFFERS) As WAVEHDR ' wave headers
Dim bufferSize As Long ' size of output buffers
Dim fPlaying As Boolean ' is file currently playing
Dim fFileOpen As Boolean ' is file currently open
Dim hWaveOut As Long ' waveout handle
Dim msg As String * 250 ' message buffer
Dim hwnd As Long ' window handle
Public Sub Initialize(hwndIn As Long)
hwnd = hwndIn
lpPrevWndProc = SetWindowLong(hwnd, GWL_WNDPROC, AddressOf WindowProc)
fPlaying = False
fFileOpen = False
startPos = 0
End Sub
Public Sub CloseFile()
mmioClose hmmioIn, 0
fFileOpen = False
End Sub
Public Sub OpenFile(soundfile As String)
Dim mmckinfoParentIn As MMCKINFO
Dim mmckinfoSubchunkIn As MMCKINFO
Dim mmioinf As mmioinfo
' close previously open file (if any)
CloseFile
If (soundfile = "") Then
Exit Sub
End If
' Open the input file
hmmioIn = mmioOpen(soundfile, mmioinf, MMIO_READ)
If (hmmioIn = 0) Then
MsgBox "Error opening input file, rc = " & mmioinf.wErrorRet
Exit Sub
End If
' Check if this is a wave file
mmckinfoParentIn.fccType = mmioStringToFOURCC("WAVE", 0)
rc = mmioDescendParent(hmmioIn, mmckinfoParentIn, 0, MMIO_FINDRIFF)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Not a wave file"
Exit Sub
End If
' Get format info
mmckinfoSubchunkIn.ckid = mmioStringToFOURCC("fmt", 0)
rc = mmioDescend(hmmioIn, mmckinfoSubchunkIn, mmckinfoParentIn, MMIO_FINDCHUNK)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Couldn't get format chunk"
Exit Sub
End If
rc = mmioReadString(hmmioIn, formatBuffer, mmckinfoSubchunkIn.ckSize)
If (rc = -1) Then
CloseFile
MsgBox "Error reading format"
Exit Sub
End If
rc = mmioAscend(hmmioIn, mmckinfoSubchunkIn, 0)
CopyStructFromString format, formatBuffer, Len(format)
' Find the data subchunk
mmckinfoSubchunkIn.ckid = mmioStringToFOURCC("data", 0)
rc = mmioDescend(hmmioIn, mmckinfoSubchunkIn, mmckinfoParentIn, MMIO_FINDCHUNK)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Couldn't get data chunk"
Exit Sub
End If
dataOffset = mmioSeek(hmmioIn, 0, SEEK_CUR)
' Get the length of the audio
audioLength = mmckinfoSubchunkIn.ckSize
' Allocate audio buffers
bufferSize = format.nSamplesPerSec * format.nBlockAlign * format.nChannels * BUFFER_SECONDS
bufferSize = bufferSize - (bufferSize Mod format.nBlockAlign)
For I = 1 To (NUM_BUFFERS)
GlobalFree hmem(I)
hmem(I) = GlobalAlloc(0, bufferSize)
pmem(I) = GlobalLock(hmem(I))
Next
fFileOpen = True
End Sub
Public Function Play() As Boolean
If (fPlaying) Then
Play = True
Exit Function
End If
rc = waveOutOpen(hWaveOut, 0, formatBuffer, hwnd, True, CALLBACK_WINDOW)
If (rc <> MMSYSERR_NOERROR) Then
waveOutGetErrorText rc, msg, Len(msg)
MsgBox msg
Play = False
Exit Function
End If
For I = 1 To NUM_BUFFERS
hdr(I).lpData = pmem(I)
hdr(I).dwBufferLength = bufferSize
hdr(I).dwFlags = 0
hdr(I).dwLoops = 0
rc = waveOutPrepareHeader(hWaveOut, hdr(I), Len(hdr(I)))
If (rc <> MMSYSERR_NOERROR) Then
waveOutGetErrorText rc, msg, Len(msg)
MsgBox msg
End If
Next
fPlaying = True
Play = True
startPos = mmioSeek(hmmioIn, 0, SEEK_CUR) - dataOffset
For I = 1 To NUM_BUFFERS
PostWavMessage hwnd, MM_WOM_DONE, 0, hdr(I)
Next
End Function
Public Sub StopPlay()
fPlaying = False
FileSeek Position()
waveOutReset hWaveOut
End Sub
Public Function Length() As Long
Length = audioLength \ format.nBlockAlign
End Function
Public Function FileSeek(Position As Long) As Boolean
Dim bytepos As Long
FileSeek = False
bytepos = Position * format.nBlockAlign
If (fFileOpen = False) Or (bytepos < 0) Or (bytepos >= audioLength) Then
Exit Function
End If
rc = mmioSeek(hmmioIn, bytepos + dataOffset, SEEK_SET)
If (rc = MMSYSERR_NOERROR) Then
FileSeek = True
End If
startPos = rc
End Function
Public Function Position() As Long
Dim tm As MMTIME
tm.wType = TIME_BYTES
rc = waveOutGetPosition(hWaveOut, tm, Len(tm))
If (rc = MMSYSERR_NOERROR) Then
Position = (startPos + tm.u) \ format.nBlockAlign
Else
Position = (mmioSeek(hmmioIn, 0, SEEK_CUR) - dataOffset + bufferSize * NUM_BUFFERS) \ format.nBlockAlign
End If
End Function
Public Function Playing() As Boolean
Dim tm As MMTIME
tm.wType = TIME_BYTES
rc = waveOutGetPosition(hWaveOut, tm, Len(tm))
If (rc = MMSYSERR_NOERROR) Then
Playing = True
Else
Playing = False
End If
End Function
Function WindowProc(ByVal hw As Long, ByVal uMsg As Long, ByVal wParam As Long, ByRef wavhdr As WAVEHDR) As Long
Static dataRemaining As Long
If (uMsg = MM_WOM_DONE) Then
If (fPlaying = True) Then
dataRemaining = (dataOffset + audioLength - mmioSeek(hmmioIn, 0, SEEK_CUR))
If (bufferSize < dataRemaining) Then
rc = mmioRead(hmmioIn, wavhdr.lpData, bufferSize)
Else
rc = mmioRead(hmmioIn, wavhdr.lpData, dataRemaining)
fPlaying = False
End If
wavhdr.dwBufferLength = rc
rc = waveOutWrite(hWaveOut, wavhdr, Len(wavhdr))
Else
For I = 1 To NUM_BUFFERS
waveOutUnprepareHeader hWaveOut, hdr(I), Len(hdr(I))
Next
waveOutClose hWaveOut
End If
End If
WindowProc = CallWindowProc(lpPrevWndProc, hw, uMsg, wParam, wavhdr)
End Function
Dim hmmioIn As Long ' file handle
Dim dataOffset As Long ' start of audio data in wave file
Dim audioLength As Long ' number of bytes in audio data
Dim pFormat As Long ' pointer to wave format
Dim formatBuffer As String * 50 ' buffer to hold the wave format
Dim startPos As Long ' sample where we started playback from
Dim format As WAVEFORMAT ' waveformat structure
Dim I As Long ' loop control variable
Dim j As Long ' loop control variable
Dim hmem(1 To NUM_BUFFERS) As Long ' memory handles
Dim pmem(1 To NUM_BUFFERS) As Long ' memory pointers
Dim hdr(1 To NUM_BUFFERS) As WAVEHDR ' wave headers
Dim bufferSize As Long ' size of output buffers
Dim fPlaying As Boolean ' is file currently playing
Dim fFileOpen As Boolean ' is file currently open
Dim hWaveOut As Long ' waveout handle
Dim msg As String * 250 ' message buffer
Dim hwnd As Long ' window handle
Public Sub Initialize(hwndIn As Long)
hwnd = hwndIn
lpPrevWndProc = SetWindowLong(hwnd, GWL_WNDPROC, AddressOf WindowProc)
fPlaying = False
fFileOpen = False
startPos = 0
End Sub
Public Sub CloseFile()
mmioClose hmmioIn, 0
fFileOpen = False
End Sub
Public Sub OpenFile(soundfile As String)
Dim mmckinfoParentIn As MMCKINFO
Dim mmckinfoSubchunkIn As MMCKINFO
Dim mmioinf As mmioinfo
' close previously open file (if any)
CloseFile
If (soundfile = "") Then
Exit Sub
End If
' Open the input file
hmmioIn = mmioOpen(soundfile, mmioinf, MMIO_READ)
If (hmmioIn = 0) Then
MsgBox "Error opening input file, rc = " & mmioinf.wErrorRet
Exit Sub
End If
' Check if this is a wave file
mmckinfoParentIn.fccType = mmioStringToFOURCC("WAVE", 0)
rc = mmioDescendParent(hmmioIn, mmckinfoParentIn, 0, MMIO_FINDRIFF)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Not a wave file"
Exit Sub
End If
' Get format info
mmckinfoSubchunkIn.ckid = mmioStringToFOURCC("fmt", 0)
rc = mmioDescend(hmmioIn, mmckinfoSubchunkIn, mmckinfoParentIn, MMIO_FINDCHUNK)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Couldn't get format chunk"
Exit Sub
End If
rc = mmioReadString(hmmioIn, formatBuffer, mmckinfoSubchunkIn.ckSize)
If (rc = -1) Then
CloseFile
MsgBox "Error reading format"
Exit Sub
End If
rc = mmioAscend(hmmioIn, mmckinfoSubchunkIn, 0)
CopyStructFromString format, formatBuffer, Len(format)
' Find the data subchunk
mmckinfoSubchunkIn.ckid = mmioStringToFOURCC("data", 0)
rc = mmioDescend(hmmioIn, mmckinfoSubchunkIn, mmckinfoParentIn, MMIO_FINDCHUNK)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Couldn't get data chunk"
Exit Sub
End If
dataOffset = mmioSeek(hmmioIn, 0, SEEK_CUR)
' Get the length of the audio
audioLength = mmckinfoSubchunkIn.ckSize
' Allocate audio buffers
bufferSize = format.nSamplesPerSec * format.nBlockAlign * format.nChannels * BUFFER_SECONDS
bufferSize = bufferSize - (bufferSize Mod format.nBlockAlign)
For I = 1 To (NUM_BUFFERS)
GlobalFree hmem(I)
hmem(I) = GlobalAlloc(0, bufferSize)
pmem(I) = GlobalLock(hmem(I))
Next
fFileOpen = True
End Sub
Public Function Play() As Boolean
If (fPlaying) Then
Play = True
Exit Function
End If
rc = waveOutOpen(hWaveOut, 0, formatBuffer, hwnd, True, CALLBACK_WINDOW)
If (rc <> MMSYSERR_NOERROR) Then
waveOutGetErrorText rc, msg, Len(msg)
MsgBox msg
Play = False
Exit Function
End If
For I = 1 To NUM_BUFFERS
hdr(I).lpData = pmem(I)
hdr(I).dwBufferLength = bufferSize
hdr(I).dwFlags = 0
hdr(I).dwLoops = 0
rc = waveOutPrepareHeader(hWaveOut, hdr(I), Len(hdr(I)))
If (rc <> MMSYSERR_NOERROR) Then
waveOutGetErrorText rc, msg, Len(msg)
MsgBox msg
End If
Next
fPlaying = True
Play = True
startPos = mmioSeek(hmmioIn, 0, SEEK_CUR) - dataOffset
For I = 1 To NUM_BUFFERS
PostWavMessage hwnd, MM_WOM_DONE, 0, hdr(I)
Next
End Function
Public Sub StopPlay()
fPlaying = False
FileSeek Position()
waveOutReset hWaveOut
End Sub
Public Function Length() As Long
Length = audioLength \ format.nBlockAlign
End Function
Public Function FileSeek(Position As Long) As Boolean
Dim bytepos As Long
FileSeek = False
bytepos = Position * format.nBlockAlign
If (fFileOpen = False) Or (bytepos < 0) Or (bytepos >= audioLength) Then
Exit Function
End If
rc = mmioSeek(hmmioIn, bytepos + dataOffset, SEEK_SET)
If (rc = MMSYSERR_NOERROR) Then
FileSeek = True
End If
startPos = rc
End Function
Public Function Position() As Long
Dim tm As MMTIME
tm.wType = TIME_BYTES
rc = waveOutGetPosition(hWaveOut, tm, Len(tm))
If (rc = MMSYSERR_NOERROR) Then
Position = (startPos + tm.u) \ format.nBlockAlign
Else
Position = (mmioSeek(hmmioIn, 0, SEEK_CUR) - dataOffset + bufferSize * NUM_BUFFERS) \ format.nBlockAlign
End If
End Function
Public Function Playing() As Boolean
Dim tm As MMTIME
tm.wType = TIME_BYTES
rc = waveOutGetPosition(hWaveOut, tm, Len(tm))
If (rc = MMSYSERR_NOERROR) Then
Playing = True
Else
Playing = False
End If
End Function
Function WindowProc(ByVal hw As Long, ByVal uMsg As Long, ByVal wParam As Long, ByRef wavhdr As WAVEHDR) As Long
Static dataRemaining As Long
If (uMsg = MM_WOM_DONE) Then
If (fPlaying = True) Then
dataRemaining = (dataOffset + audioLength - mmioSeek(hmmioIn, 0, SEEK_CUR))
If (bufferSize < dataRemaining) Then
rc = mmioRead(hmmioIn, wavhdr.lpData, bufferSize)
Else
rc = mmioRead(hmmioIn, wavhdr.lpData, dataRemaining)
fPlaying = False
End If
wavhdr.dwBufferLength = rc
rc = waveOutWrite(hWaveOut, wavhdr, Len(wavhdr))
Else
For I = 1 To NUM_BUFFERS
waveOutUnprepareHeader hWaveOut, hdr(I), Len(hdr(I))
Next
waveOutClose hWaveOut
End If
End If
WindowProc = CallWindowProc(lpPrevWndProc, hw, uMsg, wParam, wavhdr)
End Function
dbcontrols 2002-02-19
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- 举报
Dim rc As Long ' Return code
Dim hmmioIn As Long ' file handle
Dim dataOffset As Long ' start of audio data in wave file
Dim audioLength As Long ' number of bytes in audio data
Dim pFormat As Long ' pointer to wave format
Dim formatBuffer As String * 50 ' buffer to hold the wave format
Dim startPos As Long ' sample where we started playback from
Dim format As WAVEFORMAT ' waveformat structure
Dim I As Long ' loop control variable
Dim j As Long ' loop control variable
Dim hmem(1 To NUM_BUFFERS) As Long ' memory handles
Dim pmem(1 To NUM_BUFFERS) As Long ' memory pointers
Dim hdr(1 To NUM_BUFFERS) As WAVEHDR ' wave headers
Dim bufferSize As Long ' size of output buffers
Dim fPlaying As Boolean ' is file currently playing
Dim fFileOpen As Boolean ' is file currently open
Dim hWaveOut As Long ' waveout handle
Dim msg As String * 250 ' message buffer
Dim hwnd As Long ' window handle
Public Sub Initialize(hwndIn As Long)
hwnd = hwndIn
lpPrevWndProc = SetWindowLong(hwnd, GWL_WNDPROC, AddressOf WindowProc)
fPlaying = False
fFileOpen = False
startPos = 0
End Sub
Public Sub CloseFile()
mmioClose hmmioIn, 0
fFileOpen = False
End Sub
Public Sub OpenFile(soundfile As String)
Dim mmckinfoParentIn As MMCKINFO
Dim mmckinfoSubchunkIn As MMCKINFO
Dim mmioinf As mmioinfo
' close previously open file (if any)
CloseFile
If (soundfile = "") Then
Exit Sub
End If
' Open the input file
hmmioIn = mmioOpen(soundfile, mmioinf, MMIO_READ)
If (hmmioIn = 0) Then
MsgBox "Error opening input file, rc = " & mmioinf.wErrorRet
Exit Sub
End If
' Check if this is a wave file
mmckinfoParentIn.fccType = mmioStringToFOURCC("WAVE", 0)
rc = mmioDescendParent(hmmioIn, mmckinfoParentIn, 0, MMIO_FINDRIFF)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Not a wave file"
Exit Sub
End If
' Get format info
mmckinfoSubchunkIn.ckid = mmioStringToFOURCC("fmt", 0)
rc = mmioDescend(hmmioIn, mmckinfoSubchunkIn, mmckinfoParentIn, MMIO_FINDCHUNK)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Couldn't get format chunk"
Exit Sub
End If
rc = mmioReadString(hmmioIn, formatBuffer, mmckinfoSubchunkIn.ckSize)
If (rc = -1) Then
CloseFile
MsgBox "Error reading format"
Exit Sub
End If
rc = mmioAscend(hmmioIn, mmckinfoSubchunkIn, 0)
CopyStructFromString format, formatBuffer, Len(format)
' Find the data subchunk
mmckinfoSubchunkIn.ckid = mmioStringToFOURCC("data", 0)
rc = mmioDescend(hmmioIn, mmckinfoSubchunkIn, mmckinfoParentIn, MMIO_FINDCHUNK)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Couldn't get data chunk"
Exit Sub
End If
dataOffset = mmioSeek(hmmioIn, 0, SEEK_CUR)
' Get the length of the audio
audioLength = mmckinfoSubchunkIn.ckSize
' Allocate audio buffers
bufferSize = format.nSamplesPerSec * format.nBlockAlign * format.nChannels * BUFFER_SECONDS
bufferSize = bufferSize - (bufferSize Mod format.nBlockAlign)
For I = 1 To (NUM_BUFFERS)
GlobalFree hmem(I)
hmem(I) = GlobalAlloc(0, bufferSize)
pmem(I) = GlobalLock(hmem(I))
Next
fFileOpen = True
End Sub
Public Function Play() As Boolean
If (fPlaying) Then
Play = True
Exit Function
End If
rc = waveOutOpen(hWaveOut, 0, formatBuffer, hwnd, True, CALLBACK_WINDOW)
If (rc <> MMSYSERR_NOERROR) Then
waveOutGetErrorText rc, msg, Len(msg)
MsgBox msg
Play = False
Exit Function
End If
For I = 1 To NUM_BUFFERS
hdr(I).lpData = pmem(I)
hdr(I).dwBufferLength = bufferSize
hdr(I).dwFlags = 0
hdr(I).dwLoops = 0
rc = waveOutPrepareHeader(hWaveOut, hdr(I), Len(hdr(I)))
If (rc <> MMSYSERR_NOERROR) Then
waveOutGetErrorText rc, msg, Len(msg)
MsgBox msg
End If
Next
fPlaying = True
Play = True
startPos = mmioSeek(hmmioIn, 0, SEEK_CUR) - dataOffset
For I = 1 To NUM_BUFFERS
PostWavMessage hwnd, MM_WOM_DONE, 0, hdr(I)
Next
End Function
Public Sub StopPlay()
fPlaying = False
FileSeek Position()
waveOutReset hWaveOut
End Sub
Public Function Length() As Long
Length = audioLength \ format.nBlockAlign
End Function
Public Function FileSeek(Position As Long) As Boolean
Dim bytepos As Long
FileSeek = False
bytepos = Position * format.nBlockAlign
If (fFileOpen = False) Or (bytepos < 0) Or (bytepos >= audioLength) Then
Exit Function
End If
rc = mmioSeek(hmmioIn, bytepos + dataOffset, SEEK_SET)
If (rc = MMSYSERR_NOERROR) Then
FileSeek = True
End If
startPos = rc
End Function
Public Function Position() As Long
Dim tm As MMTIME
tm.wType = TIME_BYTES
rc = waveOutGetPosition(hWaveOut, tm, Len(tm))
If (rc = MMSYSERR_NOERROR) Then
Position = (startPos + tm.u) \ format.nBlockAlign
Else
Position = (mmioSeek(hmmioIn, 0, SEEK_CUR) - dataOffset + bufferSize * NUM_BUFFERS) \ format.nBlockAlign
End If
End Function
Public Function Playing() As Boolean
Dim tm As MMTIME
tm.wType = TIME_BYTES
rc = waveOutGetPosition(hWaveOut, tm, Len(tm))
If (rc = MMSYSERR_NOERROR) Then
Playing = True
Else
Playing = False
End If
End Function
Function WindowProc(ByVal hw As Long, ByVal uMsg As Long, ByVal wParam As Long, ByRef wavhdr As WAVEHDR) As Long
Static dataRemaining As Long
If (uMsg = MM_WOM_DONE) Then
If (fPlaying = True) Then
dataRemaining = (dataOffset + audioLength - mmioSeek(hmmioIn, 0, SEEK_CUR))
If (bufferSize < dataRemaining) Then
rc = mmioRead(hmmioIn, wavhdr.lpData, bufferSize)
Else
rc = mmioRead(hmmioIn, wavhdr.lpData, dataRemaining)
fPlaying = False
End If
wavhdr.dwBufferLength = rc
rc = waveOutWrite(hWaveOut, wavhdr, Len(wavhdr))
Else
For I = 1 To NUM_BUFFERS
waveOutUnprepareHeader hWaveOut, hdr(I), Len(hdr(I))
Next
waveOutClose hWaveOut
End If
End If
WindowProc = CallWindowProc(lpPrevWndProc, hw, uMsg, wParam, wavhdr)
End Function
Dim hmmioIn As Long ' file handle
Dim dataOffset As Long ' start of audio data in wave file
Dim audioLength As Long ' number of bytes in audio data
Dim pFormat As Long ' pointer to wave format
Dim formatBuffer As String * 50 ' buffer to hold the wave format
Dim startPos As Long ' sample where we started playback from
Dim format As WAVEFORMAT ' waveformat structure
Dim I As Long ' loop control variable
Dim j As Long ' loop control variable
Dim hmem(1 To NUM_BUFFERS) As Long ' memory handles
Dim pmem(1 To NUM_BUFFERS) As Long ' memory pointers
Dim hdr(1 To NUM_BUFFERS) As WAVEHDR ' wave headers
Dim bufferSize As Long ' size of output buffers
Dim fPlaying As Boolean ' is file currently playing
Dim fFileOpen As Boolean ' is file currently open
Dim hWaveOut As Long ' waveout handle
Dim msg As String * 250 ' message buffer
Dim hwnd As Long ' window handle
Public Sub Initialize(hwndIn As Long)
hwnd = hwndIn
lpPrevWndProc = SetWindowLong(hwnd, GWL_WNDPROC, AddressOf WindowProc)
fPlaying = False
fFileOpen = False
startPos = 0
End Sub
Public Sub CloseFile()
mmioClose hmmioIn, 0
fFileOpen = False
End Sub
Public Sub OpenFile(soundfile As String)
Dim mmckinfoParentIn As MMCKINFO
Dim mmckinfoSubchunkIn As MMCKINFO
Dim mmioinf As mmioinfo
' close previously open file (if any)
CloseFile
If (soundfile = "") Then
Exit Sub
End If
' Open the input file
hmmioIn = mmioOpen(soundfile, mmioinf, MMIO_READ)
If (hmmioIn = 0) Then
MsgBox "Error opening input file, rc = " & mmioinf.wErrorRet
Exit Sub
End If
' Check if this is a wave file
mmckinfoParentIn.fccType = mmioStringToFOURCC("WAVE", 0)
rc = mmioDescendParent(hmmioIn, mmckinfoParentIn, 0, MMIO_FINDRIFF)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Not a wave file"
Exit Sub
End If
' Get format info
mmckinfoSubchunkIn.ckid = mmioStringToFOURCC("fmt", 0)
rc = mmioDescend(hmmioIn, mmckinfoSubchunkIn, mmckinfoParentIn, MMIO_FINDCHUNK)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Couldn't get format chunk"
Exit Sub
End If
rc = mmioReadString(hmmioIn, formatBuffer, mmckinfoSubchunkIn.ckSize)
If (rc = -1) Then
CloseFile
MsgBox "Error reading format"
Exit Sub
End If
rc = mmioAscend(hmmioIn, mmckinfoSubchunkIn, 0)
CopyStructFromString format, formatBuffer, Len(format)
' Find the data subchunk
mmckinfoSubchunkIn.ckid = mmioStringToFOURCC("data", 0)
rc = mmioDescend(hmmioIn, mmckinfoSubchunkIn, mmckinfoParentIn, MMIO_FINDCHUNK)
If (rc <> MMSYSERR_NOERROR) Then
CloseFile
MsgBox "Couldn't get data chunk"
Exit Sub
End If
dataOffset = mmioSeek(hmmioIn, 0, SEEK_CUR)
' Get the length of the audio
audioLength = mmckinfoSubchunkIn.ckSize
' Allocate audio buffers
bufferSize = format.nSamplesPerSec * format.nBlockAlign * format.nChannels * BUFFER_SECONDS
bufferSize = bufferSize - (bufferSize Mod format.nBlockAlign)
For I = 1 To (NUM_BUFFERS)
GlobalFree hmem(I)
hmem(I) = GlobalAlloc(0, bufferSize)
pmem(I) = GlobalLock(hmem(I))
Next
fFileOpen = True
End Sub
Public Function Play() As Boolean
If (fPlaying) Then
Play = True
Exit Function
End If
rc = waveOutOpen(hWaveOut, 0, formatBuffer, hwnd, True, CALLBACK_WINDOW)
If (rc <> MMSYSERR_NOERROR) Then
waveOutGetErrorText rc, msg, Len(msg)
MsgBox msg
Play = False
Exit Function
End If
For I = 1 To NUM_BUFFERS
hdr(I).lpData = pmem(I)
hdr(I).dwBufferLength = bufferSize
hdr(I).dwFlags = 0
hdr(I).dwLoops = 0
rc = waveOutPrepareHeader(hWaveOut, hdr(I), Len(hdr(I)))
If (rc <> MMSYSERR_NOERROR) Then
waveOutGetErrorText rc, msg, Len(msg)
MsgBox msg
End If
Next
fPlaying = True
Play = True
startPos = mmioSeek(hmmioIn, 0, SEEK_CUR) - dataOffset
For I = 1 To NUM_BUFFERS
PostWavMessage hwnd, MM_WOM_DONE, 0, hdr(I)
Next
End Function
Public Sub StopPlay()
fPlaying = False
FileSeek Position()
waveOutReset hWaveOut
End Sub
Public Function Length() As Long
Length = audioLength \ format.nBlockAlign
End Function
Public Function FileSeek(Position As Long) As Boolean
Dim bytepos As Long
FileSeek = False
bytepos = Position * format.nBlockAlign
If (fFileOpen = False) Or (bytepos < 0) Or (bytepos >= audioLength) Then
Exit Function
End If
rc = mmioSeek(hmmioIn, bytepos + dataOffset, SEEK_SET)
If (rc = MMSYSERR_NOERROR) Then
FileSeek = True
End If
startPos = rc
End Function
Public Function Position() As Long
Dim tm As MMTIME
tm.wType = TIME_BYTES
rc = waveOutGetPosition(hWaveOut, tm, Len(tm))
If (rc = MMSYSERR_NOERROR) Then
Position = (startPos + tm.u) \ format.nBlockAlign
Else
Position = (mmioSeek(hmmioIn, 0, SEEK_CUR) - dataOffset + bufferSize * NUM_BUFFERS) \ format.nBlockAlign
End If
End Function
Public Function Playing() As Boolean
Dim tm As MMTIME
tm.wType = TIME_BYTES
rc = waveOutGetPosition(hWaveOut, tm, Len(tm))
If (rc = MMSYSERR_NOERROR) Then
Playing = True
Else
Playing = False
End If
End Function
Function WindowProc(ByVal hw As Long, ByVal uMsg As Long, ByVal wParam As Long, ByRef wavhdr As WAVEHDR) As Long
Static dataRemaining As Long
If (uMsg = MM_WOM_DONE) Then
If (fPlaying = True) Then
dataRemaining = (dataOffset + audioLength - mmioSeek(hmmioIn, 0, SEEK_CUR))
If (bufferSize < dataRemaining) Then
rc = mmioRead(hmmioIn, wavhdr.lpData, bufferSize)
Else
rc = mmioRead(hmmioIn, wavhdr.lpData, dataRemaining)
fPlaying = False
End If
wavhdr.dwBufferLength = rc
rc = waveOutWrite(hWaveOut, wavhdr, Len(wavhdr))
Else
For I = 1 To NUM_BUFFERS
waveOutUnprepareHeader hWaveOut, hdr(I), Len(hdr(I))
Next
waveOutClose hWaveOut
End If
End If
WindowProc = CallWindowProc(lpPrevWndProc, hw, uMsg, wParam, wavhdr)
End Function
dbcontrols 2002-02-19
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'This Project needs a module and a form. The Form must contain two buttons, a horizontal scrollbar and a timer
'Add this code to the form:
Dim fMovingSlider As Boolean
Private Sub Command1_Click()
Timer1.Interval = 100
Timer1.Enabled = True
FileSeek 0
Play
End Sub
Private Sub Command2_Click()
Timer1.Enabled = False
StopPlay
End Sub
Private Sub Form_Load()
'KPD-Team 1999
'URL: http://www.allapi.net/
'E-Mail: KPDTeam@Allapi.net
Const sWavFile = "c:\windows\msremind.wav"
'Check if the file exists
If Dir(sWavFile) = "" Or sWavFile = "" Then
HScroll1.Enabled = False
MsgBox "File not found !" + vbCrLf + "Please choose a valid file !", vbCritical + vbOKOnly
Exit Sub
End If
HScroll1.Max = 100
HScroll1.SmallChange = 1
HScroll1.LargeChange = 5
Command1.Caption = "Play"
Command2.Caption = "Stop"
MsgBox "This method uses subclassing, so never press the Stop-button." + vbCrLf + "Unload this form properly by pressing the 'X'", vbInformation + vbOKOnly
'Initialize
Initialize Me.hwnd
'Open the file
OpenFile sWavFile
End Sub
Private Sub Form_Unload(Cancel As Integer)
'If we're playing then stop
If Playing() Then StopPlay
'Close the file
CloseFile
End Sub
Private Sub HScroll1_Change()
If fMovingSlider = True Then
fMovingSlider = False
'move to a new position
FileSeek (HScroll1.Value / 100) * Length
End If
End Sub
Private Sub HScroll1_Scroll()
fMovingSlider = True
End Sub
Private Sub Timer1_Timer()
On Error Resume Next
If (fMovingSlider) Then Exit Sub
If (Playing() = False) Then
Timer1.Enabled = False
End If
HScroll1.Value = (Position() / Length()) * 100
End Sub
'Add this code to a module:
Public Const CALLBACK_WINDOW = &H10000
Public Const MMIO_READ = &H0
Public Const MMIO_FINDCHUNK = &H10
Public Const MMIO_FINDRIFF = &H20
Public Const MM_WOM_DONE = &H3BD
Public Const MMSYSERR_NOERROR = 0
Public Const SEEK_CUR = 1
Public Const SEEK_END = 2
Public Const SEEK_SET = 0
Public Const TIME_BYTES = &H4
Public Const WHDR_DONE = &H1
Type mmioinfo
dwFlags As Long
fccIOProc As Long
pIOProc As Long
wErrorRet As Long
htask As Long
cchBuffer As Long
pchBuffer As String
pchNext As String
pchEndRead As String
pchEndWrite As String
lBufOffset As Long
lDiskOffset As Long
adwInfo(4) As Long
dwReserved1 As Long
dwReserved2 As Long
hmmio As Long
End Type
Type WAVEHDR
lpData As Long
dwBufferLength As Long
dwBytesRecorded As Long
dwUser As Long
dwFlags As Long
dwLoops As Long
lpNext As Long
Reserved As Long
End Type
Type WAVEINCAPS
wMid As Integer
wPid As Integer
vDriverVersion As Long
szPname As String * 32
dwFormats As Long
wChannels As Integer
End Type
Type WAVEFORMAT
wFormatTag As Integer
nChannels As Integer
nSamplesPerSec As Long
nAvgBytesPerSec As Long
nBlockAlign As Integer
wBitsPerSample As Integer
cbSize As Integer
End Type
Type MMCKINFO
ckid As Long
ckSize As Long
fccType As Long
dwDataOffset As Long
dwFlags As Long
End Type
Type MMTIME
wType As Long
u As Long
x As Long
End Type
Declare Function waveOutGetPosition Lib "winmm.dll" (ByVal hWaveOut As Long, lpInfo As MMTIME, ByVal uSize As Long) As Long
Declare Function waveOutOpen Lib "winmm.dll" (hWaveOut As Long, ByVal uDeviceID As Long, ByVal format As String, ByVal dwCallback As Long, ByRef fPlaying As Boolean, ByVal dwFlags As Long) As Long
Declare Function waveOutPrepareHeader Lib "winmm.dll" (ByVal hWaveIn As Long, lpWaveInHdr As WAVEHDR, ByVal uSize As Long) As Long
Declare Function waveOutReset Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Declare Function waveOutUnprepareHeader Lib "winmm.dll" (ByVal hWaveIn As Long, lpWaveInHdr As WAVEHDR, ByVal uSize As Long) As Long
Declare Function waveOutClose Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Declare Function waveOutGetDevCaps Lib "winmm.dll" Alias "waveInGetDevCapsA" (ByVal uDeviceID As Long, lpCaps As WAVEINCAPS, ByVal uSize As Long) As Long
Declare Function waveOutGetNumDevs Lib "winmm.dll" () As Long
Declare Function waveOutGetErrorText Lib "winmm.dll" Alias "waveInGetErrorTextA" (ByVal err As Long, ByVal lpText As String, ByVal uSize As Long) As Long
Declare Function waveOutWrite Lib "winmm.dll" (ByVal hWaveOut As Long, lpWaveOutHdr As WAVEHDR, ByVal uSize As Long) As Long
Declare Function mmioClose Lib "winmm.dll" (ByVal hmmio As Long, ByVal uFlags As Long) As Long
Declare Function mmioDescend Lib "winmm.dll" (ByVal hmmio As Long, lpck As MMCKINFO, lpckParent As MMCKINFO, ByVal uFlags As Long) As Long
Declare Function mmioDescendParent Lib "winmm.dll" Alias "mmioDescend" (ByVal hmmio As Long, lpck As MMCKINFO, ByVal x As Long, ByVal uFlags As Long) As Long
Declare Function mmioOpen Lib "winmm.dll" Alias "mmioOpenA" (ByVal szFileName As String, lpmmioinfo As mmioinfo, ByVal dwOpenFlags As Long) As Long
Declare Function mmioRead Lib "winmm.dll" (ByVal hmmio As Long, ByVal pch As Long, ByVal cch As Long) As Long
Declare Function mmioReadString Lib "winmm.dll" Alias "mmioRead" (ByVal hmmio As Long, ByVal pch As String, ByVal cch As Long) As Long
Declare Function mmioSeek Lib "winmm.dll" (ByVal hmmio As Long, ByVal lOffset As Long, ByVal iOrigin As Long) As Long
Declare Function mmioStringToFOURCC Lib "winmm.dll" Alias "mmioStringToFOURCCA" (ByVal sz As String, ByVal uFlags As Long) As Long
Declare Function mmioAscend Lib "winmm.dll" (ByVal hmmio As Long, lpck As MMCKINFO, ByVal uFlags As Long) As Long
Declare Function GlobalAlloc Lib "kernel32" (ByVal wFlags As Long, ByVal dwBytes As Long) As Long
Declare Function GlobalLock Lib "kernel32" (ByVal hmem As Long) As Long
Declare Function GlobalFree Lib "kernel32" (ByVal hmem As Long) As Long
Declare Sub CopyStructFromPtr Lib "kernel32" Alias "RtlMoveMemory" (struct As Any, ByVal ptr As Long, ByVal cb As Long)
Declare Sub CopyPtrFromStruct Lib "kernel32" Alias "RtlMoveMemory" (ByVal ptr As Long, struct As Any, ByVal cb As Long)
Declare Sub CopyStructFromString Lib "kernel32" Alias "RtlMoveMemory" (dest As Any, ByVal source As String, ByVal cb As Long)
Declare Function PostWavMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByRef hdr As WAVEHDR) As Long
Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByRef lParam As WAVEHDR) As Long
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Public Const GWL_WNDPROC = -4
Dim lpPrevWndProc As Long
Const NUM_BUFFERS = 5
Const BUFFER_SECONDS = 0.1
'Add this code to the form:
Dim fMovingSlider As Boolean
Private Sub Command1_Click()
Timer1.Interval = 100
Timer1.Enabled = True
FileSeek 0
Play
End Sub
Private Sub Command2_Click()
Timer1.Enabled = False
StopPlay
End Sub
Private Sub Form_Load()
'KPD-Team 1999
'URL: http://www.allapi.net/
'E-Mail: KPDTeam@Allapi.net
Const sWavFile = "c:\windows\msremind.wav"
'Check if the file exists
If Dir(sWavFile) = "" Or sWavFile = "" Then
HScroll1.Enabled = False
MsgBox "File not found !" + vbCrLf + "Please choose a valid file !", vbCritical + vbOKOnly
Exit Sub
End If
HScroll1.Max = 100
HScroll1.SmallChange = 1
HScroll1.LargeChange = 5
Command1.Caption = "Play"
Command2.Caption = "Stop"
MsgBox "This method uses subclassing, so never press the Stop-button." + vbCrLf + "Unload this form properly by pressing the 'X'", vbInformation + vbOKOnly
'Initialize
Initialize Me.hwnd
'Open the file
OpenFile sWavFile
End Sub
Private Sub Form_Unload(Cancel As Integer)
'If we're playing then stop
If Playing() Then StopPlay
'Close the file
CloseFile
End Sub
Private Sub HScroll1_Change()
If fMovingSlider = True Then
fMovingSlider = False
'move to a new position
FileSeek (HScroll1.Value / 100) * Length
End If
End Sub
Private Sub HScroll1_Scroll()
fMovingSlider = True
End Sub
Private Sub Timer1_Timer()
On Error Resume Next
If (fMovingSlider) Then Exit Sub
If (Playing() = False) Then
Timer1.Enabled = False
End If
HScroll1.Value = (Position() / Length()) * 100
End Sub
'Add this code to a module:
Public Const CALLBACK_WINDOW = &H10000
Public Const MMIO_READ = &H0
Public Const MMIO_FINDCHUNK = &H10
Public Const MMIO_FINDRIFF = &H20
Public Const MM_WOM_DONE = &H3BD
Public Const MMSYSERR_NOERROR = 0
Public Const SEEK_CUR = 1
Public Const SEEK_END = 2
Public Const SEEK_SET = 0
Public Const TIME_BYTES = &H4
Public Const WHDR_DONE = &H1
Type mmioinfo
dwFlags As Long
fccIOProc As Long
pIOProc As Long
wErrorRet As Long
htask As Long
cchBuffer As Long
pchBuffer As String
pchNext As String
pchEndRead As String
pchEndWrite As String
lBufOffset As Long
lDiskOffset As Long
adwInfo(4) As Long
dwReserved1 As Long
dwReserved2 As Long
hmmio As Long
End Type
Type WAVEHDR
lpData As Long
dwBufferLength As Long
dwBytesRecorded As Long
dwUser As Long
dwFlags As Long
dwLoops As Long
lpNext As Long
Reserved As Long
End Type
Type WAVEINCAPS
wMid As Integer
wPid As Integer
vDriverVersion As Long
szPname As String * 32
dwFormats As Long
wChannels As Integer
End Type
Type WAVEFORMAT
wFormatTag As Integer
nChannels As Integer
nSamplesPerSec As Long
nAvgBytesPerSec As Long
nBlockAlign As Integer
wBitsPerSample As Integer
cbSize As Integer
End Type
Type MMCKINFO
ckid As Long
ckSize As Long
fccType As Long
dwDataOffset As Long
dwFlags As Long
End Type
Type MMTIME
wType As Long
u As Long
x As Long
End Type
Declare Function waveOutGetPosition Lib "winmm.dll" (ByVal hWaveOut As Long, lpInfo As MMTIME, ByVal uSize As Long) As Long
Declare Function waveOutOpen Lib "winmm.dll" (hWaveOut As Long, ByVal uDeviceID As Long, ByVal format As String, ByVal dwCallback As Long, ByRef fPlaying As Boolean, ByVal dwFlags As Long) As Long
Declare Function waveOutPrepareHeader Lib "winmm.dll" (ByVal hWaveIn As Long, lpWaveInHdr As WAVEHDR, ByVal uSize As Long) As Long
Declare Function waveOutReset Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Declare Function waveOutUnprepareHeader Lib "winmm.dll" (ByVal hWaveIn As Long, lpWaveInHdr As WAVEHDR, ByVal uSize As Long) As Long
Declare Function waveOutClose Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Declare Function waveOutGetDevCaps Lib "winmm.dll" Alias "waveInGetDevCapsA" (ByVal uDeviceID As Long, lpCaps As WAVEINCAPS, ByVal uSize As Long) As Long
Declare Function waveOutGetNumDevs Lib "winmm.dll" () As Long
Declare Function waveOutGetErrorText Lib "winmm.dll" Alias "waveInGetErrorTextA" (ByVal err As Long, ByVal lpText As String, ByVal uSize As Long) As Long
Declare Function waveOutWrite Lib "winmm.dll" (ByVal hWaveOut As Long, lpWaveOutHdr As WAVEHDR, ByVal uSize As Long) As Long
Declare Function mmioClose Lib "winmm.dll" (ByVal hmmio As Long, ByVal uFlags As Long) As Long
Declare Function mmioDescend Lib "winmm.dll" (ByVal hmmio As Long, lpck As MMCKINFO, lpckParent As MMCKINFO, ByVal uFlags As Long) As Long
Declare Function mmioDescendParent Lib "winmm.dll" Alias "mmioDescend" (ByVal hmmio As Long, lpck As MMCKINFO, ByVal x As Long, ByVal uFlags As Long) As Long
Declare Function mmioOpen Lib "winmm.dll" Alias "mmioOpenA" (ByVal szFileName As String, lpmmioinfo As mmioinfo, ByVal dwOpenFlags As Long) As Long
Declare Function mmioRead Lib "winmm.dll" (ByVal hmmio As Long, ByVal pch As Long, ByVal cch As Long) As Long
Declare Function mmioReadString Lib "winmm.dll" Alias "mmioRead" (ByVal hmmio As Long, ByVal pch As String, ByVal cch As Long) As Long
Declare Function mmioSeek Lib "winmm.dll" (ByVal hmmio As Long, ByVal lOffset As Long, ByVal iOrigin As Long) As Long
Declare Function mmioStringToFOURCC Lib "winmm.dll" Alias "mmioStringToFOURCCA" (ByVal sz As String, ByVal uFlags As Long) As Long
Declare Function mmioAscend Lib "winmm.dll" (ByVal hmmio As Long, lpck As MMCKINFO, ByVal uFlags As Long) As Long
Declare Function GlobalAlloc Lib "kernel32" (ByVal wFlags As Long, ByVal dwBytes As Long) As Long
Declare Function GlobalLock Lib "kernel32" (ByVal hmem As Long) As Long
Declare Function GlobalFree Lib "kernel32" (ByVal hmem As Long) As Long
Declare Sub CopyStructFromPtr Lib "kernel32" Alias "RtlMoveMemory" (struct As Any, ByVal ptr As Long, ByVal cb As Long)
Declare Sub CopyPtrFromStruct Lib "kernel32" Alias "RtlMoveMemory" (ByVal ptr As Long, struct As Any, ByVal cb As Long)
Declare Sub CopyStructFromString Lib "kernel32" Alias "RtlMoveMemory" (dest As Any, ByVal source As String, ByVal cb As Long)
Declare Function PostWavMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByRef hdr As WAVEHDR) As Long
Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByRef lParam As WAVEHDR) As Long
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Public Const GWL_WNDPROC = -4
Dim lpPrevWndProc As Long
Const NUM_BUFFERS = 5
Const BUFFER_SECONDS = 0.1
