basvfw.bas

实现 USB 图象采集 实现 USB 图象采集

Attribute VB_Name = "basVFW"
'****************************************************************
'*  VB file:   VFW.bas... VB32 wrapper for Win32 Video For Windows
'*                           functions.
'*  created:        1998 by Ray Mercer
'*
'*  last modified:  12/2/98 by Ray Mercer (added comments)
'*
'*
'*  a Visual Basic translation of Microsoft's vfw.h file which is
'*  a part of the Win32 Platform SDK
'*
'*  Copyright (c) 1998 Ray Mercer.  All rights reserved.
'****************************************************************

Option Explicit

'------------------------------------------------------------------
'  Messages which can be sent to an AVICAP window
'------------------------------------------------------------------

Public Const WM_USER As Long = &H400
Public Const WM_CAP_START As Long = WM_USER

Public Const WM_CAP_GET_CAPSTREAMPTR As Long = WM_CAP_START + 1

Public Const WM_CAP_SET_CALLBACK_ERROR As Long = WM_CAP_START + 2
Public Const WM_CAP_SET_CALLBACK_STATUS As Long = WM_CAP_START + 3
Public Const WM_CAP_SET_CALLBACK_YIELD As Long = WM_CAP_START + 4
Public Const WM_CAP_SET_CALLBACK_FRAME As Long = WM_CAP_START + 5
Public Const WM_CAP_SET_CALLBACK_VIDEOSTREAM As Long = WM_CAP_START + 6
Public Const WM_CAP_SET_CALLBACK_WAVESTREAM As Long = WM_CAP_START + 7
Public Const WM_CAP_GET_USER_DATA As Long = WM_CAP_START + 8
Public Const WM_CAP_SET_USER_DATA As Long = WM_CAP_START + 9
    
Public Const WM_CAP_DRIVER_CONNECT As Long = WM_CAP_START + 10
Public Const WM_CAP_DRIVER_DISCONNECT As Long = WM_CAP_START + 11
Public Const WM_CAP_DRIVER_GET_NAME As Long = WM_CAP_START + 12
Public Const WM_CAP_DRIVER_GET_VERSION As Long = WM_CAP_START + 13
Public Const WM_CAP_DRIVER_GET_CAPS As Long = WM_CAP_START + 14

Public Const WM_CAP_FILE_SET_CAPTURE_FILE As Long = WM_CAP_START + 20
Public Const WM_CAP_FILE_GET_CAPTURE_FILE As Long = WM_CAP_START + 21
Public Const WM_CAP_FILE_ALLOCATE As Long = WM_CAP_START + 22
Public Const WM_CAP_FILE_SAVEAS As Long = WM_CAP_START + 23
Public Const WM_CAP_FILE_SET_INFOCHUNK As Long = WM_CAP_START + 24
Public Const WM_CAP_FILE_SAVEDIB As Long = WM_CAP_START + 25

Public Const WM_CAP_EDIT_COPY As Long = WM_CAP_START + 30

Public Const WM_CAP_SET_AUDIOFORMAT As Long = WM_CAP_START + 35
Public Const WM_CAP_GET_AUDIOFORMAT As Long = WM_CAP_START + 36

Public Const WM_CAP_DLG_VIDEOFORMAT As Long = WM_CAP_START + 41
Public Const WM_CAP_DLG_VIDEOSOURCE As Long = WM_CAP_START + 42
Public Const WM_CAP_DLG_VIDEODISPLAY As Long = WM_CAP_START + 43
Public Const WM_CAP_GET_VIDEOFORMAT As Long = WM_CAP_START + 44
Public Const WM_CAP_SET_VIDEOFORMAT As Long = WM_CAP_START + 45
Public Const WM_CAP_DLG_VIDEOCOMPRESSION As Long = WM_CAP_START + 46

Public Const WM_CAP_SET_PREVIEW As Long = WM_CAP_START + 50
Public Const WM_CAP_SET_OVERLAY As Long = WM_CAP_START + 51
Public Const WM_CAP_SET_PREVIEWRATE As Long = WM_CAP_START + 52
Public Const WM_CAP_SET_SCALE As Long = WM_CAP_START + 53
Public Const WM_CAP_GET_STATUS As Long = WM_CAP_START + 54
Public Const WM_CAP_SET_SCROLL As Long = WM_CAP_START + 55

Public Const WM_CAP_GRAB_FRAME As Long = WM_CAP_START + 60
Public Const WM_CAP_GRAB_FRAME_NOSTOP As Long = WM_CAP_START + 61

Public Const WM_CAP_SEQUENCE As Long = WM_CAP_START + 62
Public Const WM_CAP_SEQUENCE_NOFILE As Long = WM_CAP_START + 63
Public Const WM_CAP_SET_SEQUENCE_SETUP As Long = WM_CAP_START + 64
Public Const WM_CAP_GET_SEQUENCE_SETUP As Long = WM_CAP_START + 65
Public Const WM_CAP_SET_MCI_DEVICE As Long = WM_CAP_START + 66
Public Const WM_CAP_GET_MCI_DEVICE As Long = WM_CAP_START + 67
Public Const WM_CAP_STOP As Long = WM_CAP_START + 68
Public Const WM_CAP_ABORT As Long = WM_CAP_START + 69

Public Const WM_CAP_SINGLE_FRAME_OPEN As Long = WM_CAP_START + 70
Public Const WM_CAP_SINGLE_FRAME_CLOSE As Long = WM_CAP_START + 71
Public Const WM_CAP_SINGLE_FRAME As Long = WM_CAP_START + 72

Public Const WM_CAP_PAL_OPEN As Long = WM_CAP_START + 80
Public Const WM_CAP_PAL_SAVE As Long = WM_CAP_START + 81
Public Const WM_CAP_PAL_PASTE As Long = WM_CAP_START + 82
Public Const WM_CAP_PAL_AUTOCREATE As Long = WM_CAP_START + 83
Public Const WM_CAP_PAL_MANUALCREATE As Long = WM_CAP_START + 84

Public Const WM_CAP_SET_CALLBACK_CAPCONTROL As Long = WM_CAP_START + 85

' ------------------------------------------------------------------
'  VFW UDTS (from vfw.h)
' ------------------------------------------------------------------

Type VFWPOINT 'strange name to avoid collision with other POINT UDTs
        x As Long
        y As Long
End Type

Type CAPDRIVERCAPS
    wDeviceIndex As Long                    '// Driver index in system.ini
    fHasOverlay As Long                     '// Can device overlay?
    fHasDlgVideoSource As Long              '// Has Video source dlg?
    fHasDlgVideoFormat As Long              '// Has Format dlg?
    fHasDlgVideoDisplay As Long             '// Has External out dlg?
    fCaptureInitialized As Long             '// Driver ready to capture?
    fDriverSuppliesPalettes As Long         '// Can driver make palettes?
    hVideoIn As Long                        '// Driver In channel
    hVideoOut As Long                       '// Driver Out channel
    hVideoExtIn As Long                     '// Driver Ext In channel
    hVideoExtOut As Long                    '// Driver Ext Out channel
End Type

Type CAPSTATUS
    uiImageWidth As Long                    '// Width of the image
    uiImageHeight As Long                   '// Height of the image
    fLiveWindow As Long                     '// Now Previewing video?
    fOverlayWindow As Long                  '// Now Overlaying video?
    fScale As Long                          '// Scale image to client?
    ptScroll As VFWPOINT                    '// Scroll position
    fUsingDefaultPalette As Long            '// Using default driver palette?
    fAudioHardware As Long                  '// Audio hardware present?
    fCapFileExists As Long                  '// Does capture file exist?
    dwCurrentVideoFrame As Long             '// # of video frames cap'td
    dwCurrentVideoFramesDropped As Long     '// # of video frames dropped
    dwCurrentWaveSamples As Long            '// # of wave samples cap'td
    dwCurrentTimeElapsedMS As Long          '// Elapsed capture duration
    hPalCurrent As Long                     '// Current palette in use
    fCapturingNow As Long                   '// Capture in progress?
    dwReturn As Long                        '// Error value after any operation
    wNumVideoAllocated As Long              '// Actual number of video buffers
    wNumAudioAllocated As Long              '// Actual number of audio buffers
End Type

Public Const AVSTREAMMASTER_AUDIO As Long = 0  '/* Audio master (VFW 1.0, 1.1) */
Public Const AVSTREAMMASTER_NONE  As Long = 1  '/* No master */
Type CAPTUREPARMS
    dwRequestMicroSecPerFrame As Long       '// Requested capture rate
    fMakeUserHitOKToCapture As Long         '// Show "Hit OK to cap" dlg?
    wPercentDropForError As Long            '// Give error msg if > (10% default)
    fYield As Long                          '// Capture via background task?
    dwIndexSize As Long                     '// Max index size in frames (32K default)
    wChunkGranularity As Long               '// Junk chunk granularity (2K default)
    fUsingDOSMemory As Long                 '// Use DOS buffers? (obsolete)
    wNumVideoRequested As Long              '// # video buffers, If 0, autocalc
    fCaptureAudio As Long                   '// Capture audio?
    wNumAudioRequested As Long              '// # audio buffers, If 0, autocalc
    vKeyAbort As Long                       '// Virtual key causing abort
    fAbortLeftMouse As Long                 '// Abort on left mouse?
    fAbortRightMouse As Long                '// Abort on right mouse?
    fLimitEnabled As Long                   '// Use wTimeLimit?
    wTimeLimit As Long                      '// Seconds to capture
    fMCIControl As Long                     '// Use MCI video source?
    fStepMCIDevice As Long                  '// Step MCI device?
    dwMCIStartTime As Long                  '// Time to start in MS
    dwMCIStopTime As Long                   '// Time to stop in MS
    fStepCaptureAt2x As Long                '// Perform spatial averaging 2x
    wStepCaptureAverageFrames As Long       '// Temporal average n Frames
    dwAudioBufferSize As Long               '// Size of audio bufs (0 = default)
    fDisableWriteCache As Long              '// Attempt to disable write cache
    AVStreamMaster As Long                  '// Which stream controls length?
End Type
                                            

Type CAPINFOCHUNK
    fccInfoID As Long                       '// Chunk ID, "ICOP" for copyright
    lpData As Long                          '// pointer to data
    cbData As Long                          '// size of lpData
End Type

Type VIDEOHDR
    lpData As Long                          '// address of video buffer
    dwBufferLength As Long                  '// size, in bytes, of the Data buffer
    dwBytesUsed As Long                     '// see below
    dwTimeCaptured As Long                  '// see below
    dwUser As Long                          '// user-specific data
    dwFlags As Long                         '// see below
    dwReserved(3) As Long                   '// reserved; do not use
End Type


'//BITMAP DEFINES (from mmsystem.h)
Public Type BITMAPINFOHEADER
   biSize As Long
   biWidth As Long
   biHeight As Long
   biPlanes As Integer
   biBitCount As Integer
   biCompression As Long
   biSizeImage As Long
   biXPelsPerMeter As Long
   biYPelsPerMeter As Long
   biClrUsed As Long
   biClrImportant As Long
End Type

Public Type BITMAPINFO
    bmiHeader As BITMAPINFOHEADER
    bmiColors() As Long 'array of RGBQUADs
End Type


'// Capture Function Declares
Declare Function capCreateCaptureWindow Lib "avicap32.dll" Alias "capCreateCaptureWindowA" _
                                        (ByVal lpszWindowName As String, _
                                        ByVal dwStyle As Long, _
                                        ByVal x As Long, _
                                        ByVal y As Long, _
                                        ByVal nWidth As Long, _
                                        ByVal nHeight As Long, _
                                        ByVal hwndParent As Long, _
                                        ByVal nID As Long) As Long 'returns HWND

Declare Function capGetDriverDescription Lib "avicap32.dll" Alias "capGetDriverDescriptionA" _
                                        (ByVal dwDriverIndex As Long, _
                                        ByVal lpszName As String, _
                                        ByVal cbName As Long, _
                                        ByVal lpszVer As String, _
                                        ByVal cbVer As Long) As Long 'returns C BOOL

'VFW "customized" File Dialogs
'these are declared in the CmnDlg.bas file since they are actually OpenFile/SaveFIle dialogs

'Private Declare Function GetOpenFileNamePreview Lib "msvfw32.dll" _
'    Alias "GetOpenFileNamePreviewA" (filestruct As OPENFILENAME) As Long
'Private Declare Function GetSaveFileNamePreview Lib "msvfw32.dll" _
'    Alias "GetSaveFileNamePreviewA" (filestruct As OPENFILENAME) As Long

'//General WINAPI Declares
Private Declare Function SendMessageAsLong Lib "user32" Alias "SendMessageA" _
                                            (ByVal hWnd As Long, _
                                            ByVal wMsg As Long, _
                                            ByVal wParam As Long, _
                                            ByVal lParam As Long) As Long
Private Declare Function SendMessageAsAny Lib "user32" Alias "SendMessageA" _
                                            (ByVal hWnd As Long, _
                                            ByVal wMsg As Long, _
                                            ByVal wParam As Long, _
                                            ByRef lParam As Any) As Long
Private Declare Function SendMessageAsString Lib "user32" Alias "SendMessageA" _
                                            (ByVal hWnd As Long, _
                                            ByVal wMsg As Long, _
                                            ByVal wParam As Long, _
                                            ByVal lParam As String) As Long
'// ------------------------------------------------------------------
'// IDs for status and error callbacks
'// ------------------------------------------------------------------

Public Const IDS_CAP_BEGIN As Long = 300              '/* "Capture Start" */
Public Const IDS_CAP_END As Long = 301                '/* "Capture End" */

Public Const IDS_CAP_INFO As Long = 401               '/* "%s" */
Public Const IDS_CAP_OUTOFMEM As Long = 402           '/* "Out of memory" */
Public Const IDS_CAP_FILEEXISTS As Long = 403         '/* "File '%s' exists -- overwrite it?" */
Public Const IDS_CAP_ERRORPALOPEN As Long = 404       '/* "Error opening palette '%s'" */
Public Const IDS_CAP_ERRORPALSAVE As Long = 405       '/* "Error saving palette '%s'" */
Public Const IDS_CAP_ERRORDIBSAVE As Long = 406       '/* "Error saving frame '%s'" */
Public Const IDS_CAP_DEFAVIEXT As Long = 407          '/* "avi" */