PureBasic Forum

       //The video types we support
        //in order of preference

        mediaSubtypes[0]    = MEDIASUBTYPE_MJPG;
        mediaSubtypes[1]     = MEDIASUBTYPE_RGB24;
        mediaSubtypes[2]     = MEDIASUBTYPE_RGB32;
        mediaSubtypes[3]     = MEDIASUBTYPE_RGB555;
        mediaSubtypes[4]     = MEDIASUBTYPE_RGB565;
        mediaSubtypes[5]     = MEDIASUBTYPE_YUY2;
        mediaSubtypes[6]     = MEDIASUBTYPE_YVYU;
        mediaSubtypes[7]     = MEDIASUBTYPE_YUYV;
        mediaSubtypes[8]     = MEDIASUBTYPE_IYUV;
        mediaSubtypes[9]     = MEDIASUBTYPE_UYVY;
        mediaSubtypes[10]     = MEDIASUBTYPE_YV12;
        mediaSubtypes[11]    = MEDIASUBTYPE_YVU9;
        mediaSubtypes[12]    = MEDIASUBTYPE_Y411;
        mediaSubtypes[13]    = MEDIASUBTYPE_Y41P;
        mediaSubtypes[14]    = MEDIASUBTYPE_Y211;
        mediaSubtypes[15]    = MEDIASUBTYPE_AYUV;

        //non standard
        mediaSubtypes[16]    = MEDIASUBTYPE_Y800;
        mediaSubtypes[17]    = MEDIASUBTYPE_Y8;
        mediaSubtypes[18]    = MEDIASUBTYPE_GREY;
        mediaSubtypes[19]    = MEDIASUBTYPE_I420;

;WORKS WITH ESCAPI
;UPDATED 9/7/2017
;PRESS CTL-Q TO QUIT
;INCORPORATES PROC AMP

ExamineDesktops()

gamma.f = 1.34 ;WEBCAM OUTPUT IS ALREADY GAMMA CORRECTED
#PEDESTAL = 16
gain.f = (235-16)/235
gain * 0.97

factor.f = 255/Pow(255,gamma)

;SET WEBCAM TO DEFAULTS AND SHARPNESS TO 192

;MAKE LUTS
Dim gammaTable.a(256)
For cnt = 0 To 255
gammaTable.a(cnt)=(Pow(cnt,gamma) * factor * gain) + #PEDESTAL
If gammaTable(cnt) > 254: gammaTable(cnt) = 254
EndIf
Next

Dim x3table.l(1921)
For cnt = 0 To 1920
x3table(cnt) = cnt * 3
Next

LoadFont(1,"Arial",24)

IncludeFile "escapi.pbi"
Global WIDTH = DesktopWidth(0)
Global HEIGHT = DesktopHeight(0)
Global WIDTHM1 = WIDTH - 1
Global HEIGHTM1 = HEIGHT - 1
Global pixCount = (WIDTH * HEIGHT) - 2

Global Dim pixcolor.l(WIDTH, HEIGHT): Global Dim unsmoothedY.d(WIDTH, HEIGHT)
Global Dim Cr.d(WIDTH, HEIGHT): Global Dim Y.d(WIDTH, HEIGHT): Global Dim Cb.d(WIDTH, HEIGHT)

Global imHeight, imWidth, xCoord, yCoord,Rd,Gd,Bd

#DEVICE = 0   
If setupESCAPI() = #Null
      MessageRequester("Error", "Unable to initialize ESCAPI.")
    End
EndIf

    bufSize = WIDTH * HEIGHT * 4
    scp.SimpleCapParams
    scp\mWidth = WIDTH
    scp\mHeight = HEIGHT
    scp\mTargetBuf = AllocateMemory(bufSize)
    *buf = scp\mTargetBuf

    If initCapture(#DEVICE, @scp)
     
image = CreateImage(1, WIDTH, HEIGHT, 24)
OpenWindow(1, 0, 0, WIDTH, HEIGHT,"",#PB_Window_BorderLess)

AddKeyboardShortcut(1, #PB_Shortcut_Control|#PB_Shortcut_Q, 113);CTL Q TO QUIT
ImageGadget(0, 0, 0, WIDTH, HEIGHT, ImageID(1))
Quit = #False

StartDrawing(ImageOutput(1))
*writeBuffer = DrawingBuffer()
pitch = DrawingBufferPitch()
StopDrawing()

StartDrawing(WindowOutput(1))
;StartDrawing(ImageOutput(1))
DrawingFont(FontID(1))

Repeat

If WindowEvent() = #PB_Event_Menu And EventMenu() = 113
  Quit = #True
EndIf
     
doCapture(#DEVICE)

;PIXEL-BY-PIXEL READING AND WRITING
hm1 = *writebuffer + (HEIGHTM1 * pitch)
*bufoff = *buf

For y = 0 To HEIGHTM1
For x = 0 To WIDTHM1
x3 = hm1 + x3table(x)

p1.l = PeekL(*bufoff)

PokeA(x3,gammaTable(p1 & 255))
PokeA(x3+1,gammaTable(p1 >> 8 & 255))
PokeA(x3+2,gammaTable(p1 >> 16))

*bufoff + 4
Next
hm1 - pitch
Next

now.f = ElapsedMilliseconds()
fps.f = now.f - then.f
SetGadgetState(0, ImageID(1))

frameCounter + 1
If frameCounter > 100: avgFPS = 30: frameCounter = 1: EndIf
avgFPS + fps

fps = (avgFPS / frameCounter)

If fps > 0:fps$ = Str((1/fps)*1000)
If (1/fps)*1000 < 10: fps$ = "0" + fps$: EndIf
EndIf

DrawText(100, 200, fps$+" fps",#White)

then.f = ElapsedMilliseconds()

Repeat: Until isCaptureDone(#DEVICE) <> #False

Until Quit = #True

StopDrawing()
deinitCapture(#DEVICE)
FreeImage(1)
FreeMemory(scp\mTargetBuf)
CloseWindow(1)

Else
      Debug "Init capture failed."
EndIf

    End

;/* Extremely Simple Capture API */
Structure SimpleCapParams
  *mTargetBuf ; Must be at least mWidth * mHeight * SizeOf(int) of size!
  mWidth.l
  mHeight.l
EndStructure

Structure IAMVideoProcAmpVtbl
property.l
lvalue.l
Flags.l
EndStructure

;Structure udtSelf
;  *VTable
;  text1.s
;EndStructure

#VideoProcAmp_Flags_Auto   = 1
#VideoProcAmp_Flags_Manual   = 2

;C style Interface

;typedef struct IAMVideoProcAmpVtbl

Interface procAmp
;         HRESULT ( STDMETHODCALLTYPE *QueryInterface )(
;             IAMVideoProcAmp * This,
;             /* [in] */ REFIID riid,
;             /* [iid_is][out] */
;             __RPC__deref_out  void **ppvObject);
;         
;ULONG (STDMETHODCALLTYPE *AddRef)(IAMVideoProcAmp * This)
         
;         ULONG ( STDMETHODCALLTYPE *Release )(
;             IAMVideoProcAmp * This);
;         
;         HRESULT ( STDMETHODCALLTYPE *GetRange )(
;             IAMVideoProcAmp * This,
;             /* [in] */ long Property,
;             /* [out] */
;             __out  long *pMin,
;             /* [out] */
;             __out  long *pMax,
;             /* [out] */
;             __out  long *pSteppingDelta,
;             /* [out] */
;             __out  long *pDefault,
;             /* [out] */
;             __out  long *pCapsFlags);
;         

;         HRESULT ( STDMETHODCALLTYPE *Set )(
;             IAMVideoProcAmp * This,
Set(property.l,lvalue.l,Flags.l)
             ;property.l ;/* [in] */
;             lValue.l /* [in] */ long
;             /* [in] */ long Flags);
;         
;         HRESULT ( STDMETHODCALLTYPE *Get )(
;             IAMVideoProcAmp * This,
;             /* [in] */ long Property,
;             /* [out] */
;             __out  long *lValue,
;             /* [out] */
;             __out  long *Flags);
EndInterface

;/* Return the number of capture devices found */
PrototypeC countCaptureDevicesProc()

; /* initCapture tries To open the video capture device.
;  * Returns 0 on failure, 1 on success.
;  * Note: Capture parameter values must Not change While capture device
;  *       is in use (i.e. between initCapture And deinitCapture).
;  *       Do *Not* free the target buffer, or change its pointer!
;  */
PrototypeC initCaptureProc(deviceno, *aParams.SimpleCapParams)

;/* deinitCapture closes the video capture device. */
PrototypeC deinitCaptureProc(deviceno)

;/* doCapture requests video frame To be captured. */
PrototypeC doCaptureProc(deviceno)

;/* isCaptureDone returns 1 when the requested frame has been captured.*/
PrototypeC isCaptureDoneProc(deviceno)

;/* Get the user-friendly name of a capture device. */
PrototypeC getCaptureDeviceNameProc(deviceno, *namebuffer, bufferlength)

;/* Returns the ESCAPI DLL version. 0x200 For 2.0 */
PrototypeC ESCAPIDLLVersionProc()

; marked as "internal" in the example
PrototypeC initCOMProc()

;chris319
Enumeration CAPTURE_PROPETIES
   #CAPTURE_BRIGHTNESS = 0
   #CAPTURE_CONTRAST
   #CAPTURE_HUE
   #CAPTURE_SATURATION
   #CAPTURE_SHARPNESS
   #CAPTURE_GAMMA
   #CAPTURE_COLORENABLE
   #CAPTURE_WHITEBALANCE
   #CAPTURE_BACKLIGHTCOMPENSATION
   #CAPTURE_GAIN
   #CAPTURE_PAN
   #CAPTURE_TILT
   #CAPTURE_ROLL
   #CAPTURE_ZOOM
   #CAPTURE_EXPOSURE
   #CAPTURE_IRIS
   #CAPTURE_FOCUS
   #CAPTURE_PROP_MAX
EndEnumeration

Procedure CreateObject()
  Protected *v.IAMVideoProcAmpVtbl
  *v = AllocateMemory(SizeOf(IAMVideoProcAmpVtbl))

;*object.procAmp = #Null ;createObject
;*object\Set(0,0,0)

;*v\VTable = ?Set

;*v\IAMVideoProcAmpVtbl = ?Set

  ProcedureReturn *v
EndProcedure

*object.IAMVideoProcAmpVtbl = createObject()
;*object\IAMVideoProcAmpVtbl = ?Set
;*v\IAMVideoProcAmpVtbl = ?Set

;*object\Set(0,0,0)

;see file strmif.h lines 9954,10110

Global countCaptureDevices.countCaptureDevicesProc
Global initCapture.initCaptureProc
Global deinitCapture.deinitCaptureProc
Global doCapture.doCaptureProc
Global isCaptureDone.isCaptureDoneProc
Global getCaptureDeviceName.getCaptureDeviceNameProc
Global ESCAPIDLLVersion.ESCAPIDLLVersionProc

Procedure setupESCAPI()
 
  ; load library
  capdll = OpenLibrary(#PB_Any, "escapi.dll")
  If capdll = 0
    ProcedureReturn 0
  EndIf
 
  ;/* Fetch function entry points */
  countCaptureDevices = GetFunction(capdll, "countCaptureDevices")
  initCapture = GetFunction(capdll, "initCapture")
  deinitCapture = GetFunction(capdll, "deinitCapture")
  doCapture = GetFunction(capdll, "doCapture")
  isCaptureDone = GetFunction(capdll, "isCaptureDone")
  initCOM.initCOMProc = GetFunction(capdll, "initCOM")
  getCaptureDeviceName = GetFunction(capdll, "getCaptureDeviceName")
  ESCAPIDLLVersion = GetFunction(capdll, "ESCAPIDLLVersion")
 
  If countCaptureDevices = 0 Or initCapture = 0 Or deinitCapture = 0 Or doCapture = 0 Or isCaptureDone = 0 Or initCOM = 0 Or getCaptureDeviceName = 0 Or ESCAPIDLLVersion = 0
    ProcedureReturn 0
  EndIf
 
  ;/* Verify DLL version */
  If ESCAPIDLLVersion() < $200
    ProcedureReturn 0
  EndIf
 
  ;/* Initialize COM.. */
  initCOM();
 
  ; returns number of devices found
  ProcedureReturn countCaptureDevices()
EndProcedure