Help converting old Blitzmax code that uses Extern

[jondecker76Participant]

I’ve been bashing my face against a wall trying to figure out Externs in monkey2.

Here is my old BMax code that would grab images from a webcam

Monkey

Import "v4l2.c" Import "TWebcam.bmx" Extern Global dev_name:Byte Ptr Global dev_width:Int Global dev_height:Int Function open_device() Function init_device() Function start_capturing() Function stop_capturing() Function uninit_device() Function close_device() Function grab_one:Byte Ptr() End Extern Type Tv4l2 Extends TWebCam Function Create:Tv4l2(dev:String, width:Int, height:Int,Threaded:Int) Local a:Tv4l2 a = New Tv4l2 dev_name = dev.tocstring() dev_width = width dev_height = height a.pixmap:TPixmap = CreatePixmap(dev_width,dev_height,PF_RGB888) a.grabbedPixmap=CreatePixmap(dev_width,dev_height,PF_RGB888) 'a.pixmap.ClearPixels(255) If Threaded a.pixmapMutex=CreateMutex() 'a.imageMutex = CreateMutex() a.isThreaded=True Else a.isThreaded=False EndIf Return a End Function Method open() open_device() init_device() start_capturing() End Method Method Update() If isThreaded If Not thread thread=CreateThread(GetFrame,Self) EndIf Else GetFrame(Self) EndIf End Method Function GetFrame:Object(thisObject:Object) Local _self:Tv4l2 = Tv4l2(thisObject) Repeat _Self.grabbedPixmap.pixels=grab_one() 'Update the instance's pixmap If _Self.pixmapMutex Then LockMutex(_Self.pixmapMutex) If _Self.grabbedPixMap Then _Self.pixmap=_Self.grabbedPixMap 'TODO: maybe copypixmap? If _Self.pixmapMutex Then UnlockMutex(_self.pixmapMutex) 'Update the instance's image 'If _Self.imageMutex Then LockMutex(_Self.imageMutex) 'If _Self.pixmap Then _Self.image=LoadImage(_Self.pixmap) 'If _Self.imageMutex Then UnlockMutex(_Self.imageMutex) Until _self.isThreaded=False End Function Method Draw(x:Int,y:Int,w:Int,h:Int,mirrored:Byte=True) Local scalex:Float Local scaley:Float Local thisImage:TImage scalex = Float(w) / Float(dev_width) scaley = Float(h) / Float(dev_height) If(mirrored) Then scalex=scalex * -1 SetScale(scalex,scaley) If pixmap<>Null If Self.pixmapMutex Then LockMutex Self.pixmapMutex thisImage=LoadImage(pixmap) If Self.pixmapMutex Then UnlockMutex Self.pixmapMutex DrawImage(thisImage,x+w,y) EndIf SetScale(1.0,1.0) End Method Method GetPixmap:TPixmap() Local thisPixmap:TPixmap = CreatePixmap(dev_width,dev_height,PF_RGB888) If Self.pixmapMutex Then LockMutex(Self.pixmapMutex) thisPixmap=CopyPixmap(Self.pixmap) If Self.pixmapMutex Then UnlockMutex(Self.pixmapMutex) Return thisPixmap End Method Method close() Self.isThreaded = False Delay(100) 'TODO: is this delay needed or too long?? stop_capturing() uninit_device() close_device() End Method End Type '========================================== 'END V4L2 STUFF '==========================================

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Import "v4l2.c" Import "TWebcam.bmx"   Extern Global dev_name:Byte Ptr Global dev_width:Int Global dev_height:Int Function open_device() Function init_device() Function start_capturing() Function stop_capturing() Function uninit_device() Function close_device() Function grab_one:Byte Ptr() End Extern   Type Tv4l2 Extends TWebCam Function Create:Tv4l2(dev:String, width:Int, height:Int,Threaded:Int) Local a:Tv4l2 a = New Tv4l2 dev_name = dev.tocstring() dev_width = width dev_height = height a.pixmap:TPixmap = CreatePixmap(dev_width,dev_height,PF_RGB888) a.grabbedPixmap=CreatePixmap(dev_width,dev_height,PF_RGB888) 'a.pixmap.ClearPixels(255) If Threaded a.pixmapMutex=CreateMutex() 'a.imageMutex = CreateMutex() a.isThreaded=True Else a.isThreaded=False EndIf Return a End Function Method open() open_device() init_device() start_capturing() End Method Method Update() If isThreaded If Not thread thread=CreateThread(GetFrame,Self) EndIf Else GetFrame(Self) EndIf End Method Function GetFrame:Object(thisObject:Object) Local _self:Tv4l2 = Tv4l2(thisObject) Repeat _Self.grabbedPixmap.pixels=grab_one() 'Update the instance's pixmap If _Self.pixmapMutex Then LockMutex(_Self.pixmapMutex) If _Self.grabbedPixMap Then _Self.pixmap=_Self.grabbedPixMap 'TODO: maybe copypixmap? If _Self.pixmapMutex Then UnlockMutex(_self.pixmapMutex) 'Update the instance's image 'If _Self.imageMutex Then LockMutex(_Self.imageMutex) 'If _Self.pixmap Then _Self.image=LoadImage(_Self.pixmap) 'If _Self.imageMutex Then UnlockMutex(_Self.imageMutex) Until _self.isThreaded=False End Function   Method Draw(x:Int,y:Int,w:Int,h:Int,mirrored:Byte=True) Local scalex:Float Local scaley:Float Local thisImage:TImage scalex = Float(w) / Float(dev_width) scaley = Float(h) / Float(dev_height) If(mirrored) Then scalex=scalex * -1 SetScale(scalex,scaley) If pixmap<>Null If Self.pixmapMutex Then LockMutex Self.pixmapMutex thisImage=LoadImage(pixmap) If Self.pixmapMutex Then UnlockMutex Self.pixmapMutex DrawImage(thisImage,x+w,y) EndIf SetScale(1.0,1.0) End Method Method GetPixmap:TPixmap() Local thisPixmap:TPixmap = CreatePixmap(dev_width,dev_height,PF_RGB888) If Self.pixmapMutex Then LockMutex(Self.pixmapMutex) thisPixmap=CopyPixmap(Self.pixmap) If Self.pixmapMutex Then UnlockMutex(Self.pixmapMutex) Return thisPixmap End Method Method close() Self.isThreaded = False Delay(100) 'TODO: is this delay needed or too long?? stop_capturing() uninit_device() close_device() End Method End Type '========================================== 'END V4L2 STUFF '==========================================

 

I’ve converted most of the code (minus some threading stuff that isn’t present yet in monkey2)

Monkey

Namespace webcam #Import "v4l2.c" #Import "<std>" #Import "<mojo>" Using std.. Using mojo.. '#Import "cam.monkey2" Extern public Global dev_name:Byte Ptr Global dev_width:Int Global dev_height:Int Function open_device() Function init_device() Function start_capturing() Function stop_capturing() Function uninit_device() Function close_device() Function grab_one:UByte Ptr() Public Class Webcam 'Extends Webcam ' Grabbed from cam.monkey2! Field pixmap:Pixmap Field grabbedPixmap:Pixmap 'Field thread:TThread 'Field pixmapMutex:TMutex Field isThreaded:Byte Method New(dev:String, width:Int, height:Int,Threaded:Bool) dev.ToCString(dev_name) dev_width = width dev_height = height pixmap = New Pixmap(dev_width,dev_height,PixelFormat.RGB24) grabbedPixmap = New Pixmap(dev_width,dev_height,PixelFormat.RGB24) pixmap.Clear(New Color(0,0,0,1)) If Threaded 'pixmapMutex=CreateMutex() 'imageMutex = CreateMutex() isThreaded=True Else isThreaded=False EndIf End Method Method open() open_device() init_device() start_capturing() End Method Method Update() 'If isThreaded ' If Not thread 'thread=CreateThread(GetFrame,Self) ' EndIf 'Else GetFrame() 'EndIf End Method Method GetFrame() 'Local _self:Tv4l2 = Tv4l2(thisObject) 'Repeat 'grabbedPixmap.pixels=grab_one() grabbedPixmap = New Pixmap(dev_width,dev_height,PixelFormat.RGB24,grab_one(),1) 'Update the instance's pixmap 'If _Self.pixmapMutex Then LockMutex(_Self.pixmapMutex) If grabbedPixmap Then pixmap=grabbedPixmap 'TODO: maybe copypixmap? 'If _Self.pixmapMutex Then UnlockMutex(_self.pixmapMutex) 'Update the instance's image 'If _Self.imageMutex Then LockMutex(_Self.imageMutex) 'If pixmap Then image=LoadImage(_Self.pixmap) 'If _Self.imageMutex Then UnlockMutex(_Self.imageMutex) 'Until _self.isThreaded=False End Method Draw(x:Int,y:Int,w:Int,h:Int,mirrored:Byte=True) Local scalex:Float Local scaley:Float Local thisImage:Image scalex = Float(w) / Float(dev_width) scaley = Float(h) / Float(dev_height) If(mirrored) Then scalex=scalex * -1 'SetScale(scalex,scaley) If pixmap<>Null 'If Self.pixmapMutex Then LockMutex Self.pixmapMutex thisImage=New Image(pixmap) 'If Self.pixmapMutex Then UnlockMutex Self.pixmapMutex 'DrawImage(thisImage,x+w,y) EndIf 'SetScale(1.0,1.0) End Method Method GetPixmap:Pixmap() ' THIS DOES NOT APPEAR TO BE USED 'Local thisPixmap:= New Pixmap(dev_width,dev_height,PF_RGB888) 'If Self.pixmapMutex Then LockMutex(Self.pixmapMutex) 'thisPixmap=CopyPixmap(Self.pixmap) 'If Self.pixmapMutex Then UnlockMutex(Self.pixmapMutex) 'Return thisPixmap Return pixmap End Method Method GetImage:Image() Return New Image(pixmap) End Method close() Self.isThreaded = False 'Delay(100) 'TODO: is this delay needed or too long?? stop_capturing() uninit_device() close_device() End Method End Class '========================================== 'END V4L2 STUFF '========================================== Function Main() end

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Namespace webcam #Import "v4l2.c" #Import "<std>" #Import "<mojo>" Using std.. Using mojo..   '#Import "cam.monkey2"     Extern public Global dev_name:Byte Ptr Global dev_width:Int Global dev_height:Int Function open_device() Function init_device() Function start_capturing() Function stop_capturing() Function uninit_device() Function close_device() Function grab_one:UByte Ptr()   Public   Class Webcam 'Extends Webcam ' Grabbed from cam.monkey2! Field pixmap:Pixmap Field grabbedPixmap:Pixmap 'Field thread:TThread 'Field pixmapMutex:TMutex Field isThreaded:Byte Method New(dev:String, width:Int, height:Int,Threaded:Bool)     dev.ToCString(dev_name) dev_width = width dev_height = height pixmap = New Pixmap(dev_width,dev_height,PixelFormat.RGB24) grabbedPixmap = New Pixmap(dev_width,dev_height,PixelFormat.RGB24) pixmap.Clear(New Color(0,0,0,1)) If Threaded 'pixmapMutex=CreateMutex() 'imageMutex = CreateMutex() isThreaded=True Else isThreaded=False EndIf End Method Method open() open_device() init_device() start_capturing() End Method Method Update() 'If isThreaded ' If Not thread 'thread=CreateThread(GetFrame,Self) ' EndIf 'Else GetFrame() 'EndIf End Method Method GetFrame() 'Local _self:Tv4l2 = Tv4l2(thisObject) 'Repeat 'grabbedPixmap.pixels=grab_one() grabbedPixmap = New Pixmap(dev_width,dev_height,PixelFormat.RGB24,grab_one(),1) 'Update the instance's pixmap 'If _Self.pixmapMutex Then LockMutex(_Self.pixmapMutex) If grabbedPixmap Then pixmap=grabbedPixmap 'TODO: maybe copypixmap? 'If _Self.pixmapMutex Then UnlockMutex(_self.pixmapMutex) 'Update the instance's image 'If _Self.imageMutex Then LockMutex(_Self.imageMutex) 'If pixmap Then image=LoadImage(_Self.pixmap) 'If _Self.imageMutex Then UnlockMutex(_Self.imageMutex) 'Until _self.isThreaded=False End   Method Draw(x:Int,y:Int,w:Int,h:Int,mirrored:Byte=True) Local scalex:Float Local scaley:Float Local thisImage:Image scalex = Float(w) / Float(dev_width) scaley = Float(h) / Float(dev_height) If(mirrored) Then scalex=scalex * -1 'SetScale(scalex,scaley) If pixmap<>Null 'If Self.pixmapMutex Then LockMutex Self.pixmapMutex thisImage=New Image(pixmap) 'If Self.pixmapMutex Then UnlockMutex Self.pixmapMutex 'DrawImage(thisImage,x+w,y) EndIf 'SetScale(1.0,1.0) End Method Method GetPixmap:Pixmap() ' THIS DOES NOT APPEAR TO BE USED 'Local thisPixmap:= New Pixmap(dev_width,dev_height,PF_RGB888) 'If Self.pixmapMutex Then LockMutex(Self.pixmapMutex) 'thisPixmap=CopyPixmap(Self.pixmap) 'If Self.pixmapMutex Then UnlockMutex(Self.pixmapMutex) 'Return thisPixmap Return pixmap End Method Method GetImage:Image() Return New Image(pixmap) End Method close() Self.isThreaded = False 'Delay(100) 'TODO: is this delay needed or too long?? stop_capturing() uninit_device() close_device() End Method End Class '========================================== 'END V4L2 STUFF '==========================================             Function Main()   end

But I’m pretty sure that I’m not getting the externs correct, causing  all kinds of problems just trying to compile. Here are my errors trying to compile the module:

Monkey

Parsing... Semanting... Translating... Compiling.... Build error: System command 'g++ -std=c++11 -O3 -DNDEBUG -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/freetype/freetype-2.6.3/include/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/sdl2-mixer/SDL_mixer/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/sdl2/SDL/include/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/monkey/native" -c -o "/home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_0webcam.cpp.o" "/home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp"' failed. g++ -std=c++11 -O3 -DNDEBUG -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/freetype/freetype-2.6.3/include/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/sdl2-mixer/SDL_mixer/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/sdl2/SDL/include/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/monkey/native" -c -o "/home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_0webcam.cpp.o" "/home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp" /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp: In constructor t_webcam_Webcam::t_webcam_Webcam(bbString, bbInt, bbInt, bbBool): /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:18:28: error: dev_name was not declared in this scope l_dev.toCString(((void*)(dev_name))); ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:19:3: error: dev_width was not declared in this scope dev_width=l_width; ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:20:3: error: dev_height was not declared in this scope dev_height=l_height; ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp: In member function void t_webcam_Webcam::m_open(): /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:32:15: error: open_device was not declared in this scope open_device(); ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:33:15: error: init_device was not declared in this scope init_device(); ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:34:19: error: start_capturing was not declared in this scope start_capturing(); ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp: In member function void t_webcam_Webcam::m_close(): /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:39:18: error: stop_capturing was not declared in this scope stop_capturing(); ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:40:17: error: uninit_device was not declared in this scope uninit_device(); ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:41:16: error: close_device was not declared in this scope close_device(); ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp: In member function void t_webcam_Webcam::m_GetFrame(): /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:57:56: error: dev_width was not declared in this scope this->m_grabbedPixmap=bbGCNew<t_std_graphics_Pixmap>(dev_width,dev_height,4,grab_one(),1); ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:57:66: error: dev_height was not declared in this scope this->m_grabbedPixmap=bbGCNew<t_std_graphics_Pixmap>(dev_width,dev_height,4,grab_one(),1); ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:57:88: error: grab_one was not declared in this scope this->m_grabbedPixmap=bbGCNew<t_std_graphics_Pixmap>(dev_width,dev_height,4,grab_one(),1); ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp: In member function void t_webcam_Webcam::m_Draw(bbInt, bbInt, bbInt, bbInt, bbByte): /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:72:34: error: dev_width was not declared in this scope l_scalex=(bbFloat(l_w)/bbFloat(dev_width)); ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:73:34: error: dev_height was not declared in this scope l_scaley=(bbFloat(l_h)/bbFloat(dev_height)); ^ ***** Fatal mx2cc error ***** Build error.

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Parsing... Semanting... Translating... Compiling.... Build error: System command 'g++ -std=c++11 -O3 -DNDEBUG -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/freetype/freetype-2.6.3/include/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/sdl2-mixer/SDL_mixer/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/sdl2/SDL/include/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/monkey/native" -c -o "/home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_0webcam.cpp.o" "/home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp"' failed.   g++ -std=c++11 -O3 -DNDEBUG -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/freetype/freetype-2.6.3/include/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/sdl2-mixer/SDL_mixer/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/sdl2/SDL/include/" -I"/home/jondecker76/Downloads/monkey2-1.0.0/modules/monkey/native" -c -o "/home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_0webcam.cpp.o" "/home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp"   /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp: In constructor t_webcam_Webcam::t_webcam_Webcam(bbString, bbInt, bbInt, bbBool): /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:18:28: error: dev_name was not declared in this scope    l_dev.toCString(((void*)(dev_name)));                             ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:19:3: error: dev_width was not declared in this scope    dev_width=l_width;    ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:20:3: error: dev_height was not declared in this scope    dev_height=l_height;    ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp: In member function void t_webcam_Webcam::m_open(): /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:32:15: error: open_device was not declared in this scope    open_device();                ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:33:15: error: init_device was not declared in this scope    init_device();                ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:34:19: error: start_capturing was not declared in this scope    start_capturing();                    ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp: In member function void t_webcam_Webcam::m_close(): /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:39:18: error: stop_capturing was not declared in this scope    stop_capturing();                   ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:40:17: error: uninit_device was not declared in this scope    uninit_device();                  ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:41:16: error: close_device was not declared in this scope    close_device();                 ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp: In member function void t_webcam_Webcam::m_GetFrame(): /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:57:56: error: dev_width was not declared in this scope    this->m_grabbedPixmap=bbGCNew<t_std_graphics_Pixmap>(dev_width,dev_height,4,grab_one(),1);                                                         ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:57:66: error: dev_height was not declared in this scope    this->m_grabbedPixmap=bbGCNew<t_std_graphics_Pixmap>(dev_width,dev_height,4,grab_one(),1);                                                                   ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:57:88: error: grab_one was not declared in this scope    this->m_grabbedPixmap=bbGCNew<t_std_graphics_Pixmap>(dev_width,dev_height,4,grab_one(),1);                                                                                         ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp: In member function void t_webcam_Webcam::m_Draw(bbInt, bbInt, bbInt, bbInt, bbByte): /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:72:34: error: dev_width was not declared in this scope    l_scalex=(bbFloat(l_w)/bbFloat(dev_width));                                   ^ /home/jondecker76/Downloads/monkey2-1.0.0/modules/webcam/webcam.buildv1.0.0/build_cache/desktop_release_linux/webcam_webcam.cpp:73:34: error: dev_height was not declared in this scope    l_scaley=(bbFloat(l_h)/bbFloat(dev_height));                                   ^     ***** Fatal mx2cc error *****   Build error.

It’s not seeing any of the defined externs
Any thoughts?

[jondecker76Participant]

<deleted>

[jondecker76Participant]

Here’s the contents of v4l2.c if it helps at all…

Monkey

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <assert.h> #include <getopt.h> // getopt_long() #include <fcntl.h> // low-level i/o #include <unistd.h> #include <errno.h> #include <malloc.h> #include <sys/stat.h> #include <sys/types.h> #include <sys/time.h> #include <sys/mman.h> #include <sys/ioctl.h> #include <asm/types.h> // for videodev2.h #include <linux/videodev2.h> // the meat and potatoes #define CLEAR(x) memset (&(x), 0, sizeof (x)) //GLOBALS TO IMPORT INTO BLITZ MAX (with sensible defaults) char *dev_name = "/dev/video0";//NULL; int dev_width = 640; int dev_height = 480; //END GLOBALS int pix_pitch = 3; //3 bytes - R, G and B typedef enum { IO_METHOD_READ, IO_METHOD_MMAP, IO_METHOD_USERPTR,r } io_method; struct buffer { void * start; size_t length; }; struct buffer *buffers = NULL; io_method io = IO_METHOD_MMAP; int fd = -1; unsigned int n_buffers = 0; void errno_exit(const char *s) { fprintf (stderr, "%s error %d, %s\n",s, errno, strerror (errno)); exit (EXIT_FAILURE); } int xioctl(int fd,int request,void *arg) { int r; do r = ioctl (fd, request, arg); while (-1 == r && EINTR == errno); return r; } int read_frame(void) { struct v4l2_buffer buf; unsigned int i; switch (io) { case IO_METHOD_READ: if (-1 == read (fd, buffers[0].start, buffers[0].length)) { switch (errno) { case EAGAIN: return 0; case EIO: /* Could ignore EIO, see spec. */ /* fall through */ default: errno_exit ("read"); } } break; case IO_METHOD_MMAP: CLEAR (buf); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; if (-1 == xioctl (fd, VIDIOC_DQBUF, &buf)) { switch (errno) { case EAGAIN: return 0; case EIO: /* Could ignore EIO, see spec. */ /* fall through */ default: errno_exit ("VIDIOC_DQBUF"); } } assert (buf.index < n_buffers); if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF"); break; case IO_METHOD_USERPTR: CLEAR (buf); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_USERPTR; if (-1 == xioctl (fd, VIDIOC_DQBUF, &buf)) { switch (errno) { case EAGAIN: return 0; case EIO: /* Could ignore EIO, see spec. */ /* fall through */ default: errno_exit ("VIDIOC_DQBUF"); } } for (i = 0; i < n_buffers; ++i) if (buf.m.userptr == (unsigned long) buffers[i].start && buf.length == buffers[i].length) break; assert (i < n_buffers); if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF"); break; } return 1; } unsigned char *grab_one() { unsigned char *buf_rgb24[dev_width*dev_height]; for (;;) { fd_set fds; struct timeval tv; int r; FD_ZERO (&fds); FD_SET (fd, &fds); // Timeout. tv.tv_sec = 2; tv.tv_usec = 0; r = select (fd + 1, &fds, NULL, NULL, &tv); if (-1 == r) { if (EINTR == errno) continue; errno_exit ("select"); } if (0 == r) { fprintf (stderr, "select timeout\n"); exit (EXIT_FAILURE); } if (read_frame ()) { //yuyv2rgb(buffers[0].start,dev_width, dev_height); yuyv_to_rgb24 (dev_width, dev_height, buffers[0].start, buf_rgb24); return buf_rgb24;//buffers[0].start; } } } void stop_capturing(void) { enum v4l2_buf_type type; switch (io) { case IO_METHOD_READ: /* Nothing to do. */ break; case IO_METHOD_MMAP: case IO_METHOD_USERPTR: type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (-1 == xioctl (fd, VIDIOC_STREAMOFF, &type)) errno_exit ("VIDIOC_STREAMOFF"); break; } } void start_capturing(void) { unsigned int i; enum v4l2_buf_type type; switch (io) { case IO_METHOD_READ: /* Nothing to do. */ break; case IO_METHOD_MMAP: for (i = 0; i < n_buffers; ++i) { struct v4l2_buffer buf; CLEAR (buf); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; buf.index = i; if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF"); } type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (-1 == xioctl (fd, VIDIOC_STREAMON, &type)) errno_exit ("VIDIOC_STREAMON"); break; case IO_METHOD_USERPTR: for (i = 0; i < n_buffers; ++i) { struct v4l2_buffer buf; CLEAR (buf); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_USERPTR; buf.index = i; buf.m.userptr = (unsigned long) buffers[i].start; buf.length = buffers[i].length; if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF"); } type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (-1 == xioctl (fd, VIDIOC_STREAMON, &type)) errno_exit ("VIDIOC_STREAMON"); break; } } void uninit_device(void) { unsigned int i; switch (io) { case IO_METHOD_READ: free (buffers[0].start); break; case IO_METHOD_MMAP: for (i = 0; i < n_buffers; ++i) if (-1 == munmap (buffers[i].start, buffers[i].length)) errno_exit ("munmap"); break; case IO_METHOD_USERPTR: for (i = 0; i < n_buffers; ++i) free (buffers[i].start); break; } free (buffers); } void init_read(unsigned int buffer_size) { buffers = calloc (1, sizeof (*buffers)); if (!buffers) { fprintf (stderr, "Out of memory\n"); exit (EXIT_FAILURE); } buffers[0].length = buffer_size; buffers[0].start = malloc (buffer_size); if (!buffers[0].start) { fprintf (stderr, "Out of memory\n"); exit (EXIT_FAILURE); } } void init_mmap(void) { struct v4l2_requestbuffers req; CLEAR (req); req.count = 4; req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; req.memory = V4L2_MEMORY_MMAP; if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) { if (EINVAL == errno) { fprintf (stderr, "%s does not support " "memory mapping\n", dev_name); exit (EXIT_FAILURE); } else { errno_exit ("VIDIOC_REQBUFS"); } } if (req.count < 2) { fprintf (stderr, "Insufficient buffer memory on %s\n", dev_name); exit (EXIT_FAILURE); } buffers = calloc (req.count, sizeof (*buffers)); if (!buffers) { fprintf (stderr, "Out of memory\n"); exit (EXIT_FAILURE); } for (n_buffers = 0; n_buffers < req.count; ++n_buffers) { struct v4l2_buffer buf; CLEAR (buf); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; buf.index = n_buffers; if (-1 == xioctl (fd, VIDIOC_QUERYBUF, &buf)) errno_exit ("VIDIOC_QUERYBUF"); buffers[n_buffers].length = buf.length; buffers[n_buffers].start = mmap (NULL /* start anywhere */, buf.length, PROT_READ | PROT_WRITE /* required */, MAP_SHARED /* recommended */, fd, buf.m.offset); if (MAP_FAILED == buffers[n_buffers].start) errno_exit ("mmap"); } } void init_userp(unsigned int buffer_size) { struct v4l2_requestbuffers req; unsigned int page_size; page_size = getpagesize (); buffer_size = (buffer_size + page_size - 1) & ~(page_size - 1); CLEAR (req); req.count = 4; req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; req.memory = V4L2_MEMORY_USERPTR; if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) { if (EINVAL == errno) { fprintf (stderr, "%s does not support " "user pointer i/o\n", dev_name); exit (EXIT_FAILURE); } else { errno_exit ("VIDIOC_REQBUFS"); } } buffers = calloc (4, sizeof (*buffers)); if (!buffers) { fprintf (stderr, "Out of memory\n"); exit (EXIT_FAILURE); } for (n_buffers = 0; n_buffers < 4; ++n_buffers) { buffers[n_buffers].length = buffer_size; buffers[n_buffers].start = memalign (/* boundary */ page_size, buffer_size); if (!buffers[n_buffers].start) { fprintf (stderr, "Out of memory\n"); exit (EXIT_FAILURE); } } } void init_device(void) { struct v4l2_capability cap; struct v4l2_cropcap cropcap; struct v4l2_crop crop; struct v4l2_format fmt; struct v4l2_input input; v4l2_std_id std_id; unsigned int min; if (-1 == xioctl (fd, VIDIOC_QUERYCAP, &cap)) { if (EINVAL == errno) { fprintf (stderr, "%s is no V4L2 device\n", dev_name); exit (EXIT_FAILURE); } else { errno_exit ("VIDIOC_QUERYCAP"); } } if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) { fprintf (stderr, "%s is no video capture device\n", dev_name); exit (EXIT_FAILURE); } switch (io) { case IO_METHOD_READ: if (!(cap.capabilities & V4L2_CAP_READWRITE)) { fprintf (stderr, "%s does not support read i/o\n", dev_name); exit (EXIT_FAILURE); } break; case IO_METHOD_MMAP: case IO_METHOD_USERPTR: if (!(cap.capabilities & V4L2_CAP_STREAMING)) { fprintf (stderr, "%s does not support streaming i/o\n", dev_name); exit (EXIT_FAILURE); } break; } /* Select video input, video standard and tune here. memset (&input, 0, sizeof (input)); if (-1 == ioctl (fd, VIDIOC_G_INPUT, &input.index)) { perror ("VIDIOC_G_INPUT"); exit (EXIT_FAILURE); } if (-1 == ioctl (fd, VIDIOC_ENUMINPUT, &input)) { perror ("VIDIOC_ENUM_INPUT"); exit (EXIT_FAILURE); } if (0 == (input.std & V4L2_PAL_BG)) { fprintf (stderr, "Oops. B/G PAL is not supported.\n"); exit (EXIT_FAILURE); } */ CLEAR (cropcap); cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (0 == xioctl (fd, VIDIOC_CROPCAP, &cropcap)) { crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; crop.c = cropcap.defrect; /* reset to default */ if (-1 == xioctl (fd, VIDIOC_S_CROP, &crop)) { switch (errno) { case EINVAL: /* Cropping not supported. */ break; default: /* Errors ignored. */ break; } } } else { /* Errors ignored. */ } CLEAR (fmt); fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; fmt.fmt.pix.width = dev_width; fmt.fmt.pix.height = dev_height; fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV; fmt.fmt.pix.field = V4L2_FIELD_INTERLACED; if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt)) errno_exit ("VIDIOC_S_FMT"); /* Note VIDIOC_S_FMT may change width and height. */ /* Buggy driver paranoia. */ min = fmt.fmt.pix.width * 2; if (fmt.fmt.pix.bytesperline < min) fmt.fmt.pix.bytesperline = min; min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height; if (fmt.fmt.pix.sizeimage < min) fmt.fmt.pix.sizeimage = min; switch (io) { case IO_METHOD_READ: init_read (fmt.fmt.pix.sizeimage); break; case IO_METHOD_MMAP: init_mmap (); break; case IO_METHOD_USERPTR: init_userp (fmt.fmt.pix.sizeimage); break; } } void close_device(void) { if (-1 == close (fd)) errno_exit ("close"); fd = -1; } void open_device(void) { struct stat st; if (-1 == stat (dev_name, &st)) { fprintf (stderr, "Cannot identify '%s': %d, %s\n", dev_name, errno, strerror (errno)); exit (EXIT_FAILURE); } if (!S_ISCHR (st.st_mode)) { fprintf (stderr, "%s is no device\n", dev_name); exit (EXIT_FAILURE); } fd = open (dev_name, O_RDWR /* required */ | O_NONBLOCK, 0); if (-1 == fd) { fprintf (stderr, "Cannot open '%s': %d, %s\n", dev_name, errno, strerror (errno)); exit (EXIT_FAILURE); } } //Convert from YUV 4:2:2 to RGB24 format! void yuyv_to_rgb24 (int width, int height, unsigned int *src, unsigned char *dst) { unsigned char *s; unsigned char *d; int l, c; int r, g, b, cr, cg, cb, y1, y2; l = height; s = src; d = dst; while (l--) { c = width >> 1; while (c--) { y1 = *s++; cb = ((*s - 128) * 454) >> 8; cg = (*s++ - 128) * 88; y2 = *s++; cr = ((*s - 128) * 359) >> 8; cg = (cg + (*s++ - 128) * 183) >> 8; r = y1 + cr; b = y1 + cb; g = y1 - cg; r=limit(r,0,255); g=limit(g,0,255); b=limit(b,0,255); *d++ = r; *d++ = g; *d++ = b; r = y2 + cr; b = y2 + cb; g = y2 - cg; r=limit(r,0,255); g=limit(g,0,255); b=limit(b,0,255); *d++ = r; *d++ = g; *d++ = b; } } } int limit(int val, int min, int max) { if(val<min) return min; if(val>max) return max; return val; }

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#include <stdio.h> #include <stdlib.h> #include <string.h> #include <assert.h> #include <getopt.h>             // getopt_long() #include <fcntl.h>              // low-level i/o #include <unistd.h> #include <errno.h> #include <malloc.h> #include <sys/stat.h> #include <sys/types.h> #include <sys/time.h> #include <sys/mman.h> #include <sys/ioctl.h> #include <asm/types.h>          // for videodev2.h #include <linux/videodev2.h> // the meat and potatoes #define CLEAR(x) memset (&(x), 0, sizeof (x))     //GLOBALS TO IMPORT INTO BLITZ MAX (with sensible defaults) char *dev_name   = "/dev/video0";//NULL; int dev_width    = 640; int dev_height   = 480; //END GLOBALS int pix_pitch    = 3; //3 bytes - R, G and B   typedef enum { IO_METHOD_READ, IO_METHOD_MMAP, IO_METHOD_USERPTR,r } io_method;   struct buffer {         void *                  start;         size_t                  length; }; struct buffer *buffers = NULL;     io_method io = IO_METHOD_MMAP; int fd = -1; unsigned int n_buffers = 0;   void errno_exit(const char *s) {         fprintf (stderr, "%s error %d, %s\n",s, errno, strerror (errno));         exit (EXIT_FAILURE); }   int xioctl(int fd,int request,void *arg) {         int r;           do r = ioctl (fd, request, arg);         while (-1 == r && EINTR == errno);           return r; }   int read_frame(void) {         struct v4l2_buffer buf; unsigned int i;   switch (io) { case IO_METHOD_READ:      if (-1 == read (fd, buffers[0].start, buffers[0].length)) {              switch (errno) {              case EAGAIN:                      return 0;   case EIO: /* Could ignore EIO, see spec. */   /* fall through */   default: errno_exit ("read"); } }   break;   case IO_METHOD_MMAP: CLEAR (buf);                buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;              buf.memory = V4L2_MEMORY_MMAP;        if (-1 == xioctl (fd, VIDIOC_DQBUF, &buf)) {              switch (errno) {              case EAGAIN:                      return 0;   case EIO: /* Could ignore EIO, see spec. */   /* fall through */   default: errno_exit ("VIDIOC_DQBUF"); } }                   assert (buf.index < n_buffers);   if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF");   break;   case IO_METHOD_USERPTR: CLEAR (buf);        buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;      buf.memory = V4L2_MEMORY_USERPTR;   if (-1 == xioctl (fd, VIDIOC_DQBUF, &buf)) { switch (errno) { case EAGAIN: return 0;   case EIO: /* Could ignore EIO, see spec. */   /* fall through */   default: errno_exit ("VIDIOC_DQBUF"); } }   for (i = 0; i < n_buffers; ++i) if (buf.m.userptr == (unsigned long) buffers[i].start     && buf.length == buffers[i].length) break;   assert (i < n_buffers);   if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF");   break; }   return 1; }   unsigned char *grab_one() { unsigned char *buf_rgb24[dev_width*dev_height]; for (;;) { fd_set fds; struct timeval tv; int r;   FD_ZERO (&fds); FD_SET (fd, &fds);   // Timeout. tv.tv_sec = 2; tv.tv_usec = 0;   r = select (fd + 1, &fds, NULL, NULL, &tv);   if (-1 == r) { if (EINTR == errno) continue;   errno_exit ("select"); }   if (0 == r) { fprintf (stderr, "select timeout\n"); exit (EXIT_FAILURE); }   if (read_frame ()) { //yuyv2rgb(buffers[0].start,dev_width, dev_height); yuyv_to_rgb24 (dev_width, dev_height, buffers[0].start, buf_rgb24); return buf_rgb24;//buffers[0].start; } } }     void stop_capturing(void) {         enum v4l2_buf_type type;   switch (io) { case IO_METHOD_READ: /* Nothing to do. */ break;   case IO_METHOD_MMAP: case IO_METHOD_USERPTR: type = V4L2_BUF_TYPE_VIDEO_CAPTURE;   if (-1 == xioctl (fd, VIDIOC_STREAMOFF, &type)) errno_exit ("VIDIOC_STREAMOFF");   break; } }   void start_capturing(void) {         unsigned int i;         enum v4l2_buf_type type;   switch (io) { case IO_METHOD_READ: /* Nothing to do. */ break;   case IO_METHOD_MMAP: for (i = 0; i < n_buffers; ++i) {              struct v4l2_buffer buf;            CLEAR (buf);            buf.type        = V4L2_BUF_TYPE_VIDEO_CAPTURE;          buf.memory      = V4L2_MEMORY_MMAP;          buf.index       = i;            if (-1 == xioctl (fd, VIDIOC_QBUF, &buf))                      errno_exit ("VIDIOC_QBUF"); } type = V4L2_BUF_TYPE_VIDEO_CAPTURE;   if (-1 == xioctl (fd, VIDIOC_STREAMON, &type)) errno_exit ("VIDIOC_STREAMON");   break;   case IO_METHOD_USERPTR: for (i = 0; i < n_buffers; ++i) {              struct v4l2_buffer buf;            CLEAR (buf);            buf.type        = V4L2_BUF_TYPE_VIDEO_CAPTURE;          buf.memory      = V4L2_MEMORY_USERPTR; buf.index       = i; buf.m.userptr = (unsigned long) buffers[i].start; buf.length      = buffers[i].length; if (-1 == xioctl (fd, VIDIOC_QBUF, &buf))                      errno_exit ("VIDIOC_QBUF"); }   type = V4L2_BUF_TYPE_VIDEO_CAPTURE;   if (-1 == xioctl (fd, VIDIOC_STREAMON, &type)) errno_exit ("VIDIOC_STREAMON");   break; } }   void uninit_device(void) {         unsigned int i;   switch (io) { case IO_METHOD_READ: free (buffers[0].start); break;   case IO_METHOD_MMAP: for (i = 0; i < n_buffers; ++i) if (-1 == munmap (buffers[i].start, buffers[i].length)) errno_exit ("munmap"); break;   case IO_METHOD_USERPTR: for (i = 0; i < n_buffers; ++i) free (buffers[i].start); break; }   free (buffers); }   void init_read(unsigned int buffer_size) {         buffers = calloc (1, sizeof (*buffers));           if (!buffers) {                 fprintf (stderr, "Out of memory\n");                 exit (EXIT_FAILURE);         }   buffers[0].length = buffer_size; buffers[0].start = malloc (buffer_size);   if (!buffers[0].start) {      fprintf (stderr, "Out of memory\n");              exit (EXIT_FAILURE); } }   void init_mmap(void) { struct v4l2_requestbuffers req;           CLEAR (req);           req.count               = 4;         req.type                = V4L2_BUF_TYPE_VIDEO_CAPTURE;         req.memory              = V4L2_MEMORY_MMAP;   if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) {                 if (EINVAL == errno) {                         fprintf (stderr, "%s does not support "                                  "memory mapping\n", dev_name);                         exit (EXIT_FAILURE);                 } else {                         errno_exit ("VIDIOC_REQBUFS");                 }         }           if (req.count < 2) {                 fprintf (stderr, "Insufficient buffer memory on %s\n",                          dev_name);                 exit (EXIT_FAILURE);         }           buffers = calloc (req.count, sizeof (*buffers));           if (!buffers) {                 fprintf (stderr, "Out of memory\n");                 exit (EXIT_FAILURE);         }           for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {                 struct v4l2_buffer buf;                   CLEAR (buf);                   buf.type        = V4L2_BUF_TYPE_VIDEO_CAPTURE;                 buf.memory      = V4L2_MEMORY_MMAP;                 buf.index       = n_buffers;                   if (-1 == xioctl (fd, VIDIOC_QUERYBUF, &buf))                         errno_exit ("VIDIOC_QUERYBUF");                   buffers[n_buffers].length = buf.length;                 buffers[n_buffers].start =                         mmap (NULL /* start anywhere */,                               buf.length,                               PROT_READ | PROT_WRITE /* required */,                               MAP_SHARED /* recommended */,                               fd, buf.m.offset);                   if (MAP_FAILED == buffers[n_buffers].start)                         errno_exit ("mmap");         } }   void init_userp(unsigned int buffer_size) { struct v4l2_requestbuffers req;         unsigned int page_size;           page_size = getpagesize ();         buffer_size = (buffer_size + page_size - 1) & ~(page_size - 1);           CLEAR (req);           req.count               = 4;         req.type                = V4L2_BUF_TYPE_VIDEO_CAPTURE;         req.memory              = V4L2_MEMORY_USERPTR;           if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) {                 if (EINVAL == errno) {                         fprintf (stderr, "%s does not support "                                  "user pointer i/o\n", dev_name);                         exit (EXIT_FAILURE);                 } else {                         errno_exit ("VIDIOC_REQBUFS");                 }         }           buffers = calloc (4, sizeof (*buffers));           if (!buffers) {                 fprintf (stderr, "Out of memory\n");                 exit (EXIT_FAILURE);         }           for (n_buffers = 0; n_buffers < 4; ++n_buffers) {                 buffers[n_buffers].length = buffer_size;                 buffers[n_buffers].start = memalign (/* boundary */ page_size,                                                      buffer_size);                   if (!buffers[n_buffers].start) {      fprintf (stderr, "Out of memory\n");              exit (EXIT_FAILURE); }         } }   void init_device(void) {         struct v4l2_capability cap;         struct v4l2_cropcap cropcap;         struct v4l2_crop crop;         struct v4l2_format fmt; struct v4l2_input input; v4l2_std_id std_id;     unsigned int min;           if (-1 == xioctl (fd, VIDIOC_QUERYCAP, &cap)) {                 if (EINVAL == errno) {                         fprintf (stderr, "%s is no V4L2 device\n",                                  dev_name);                         exit (EXIT_FAILURE);                 } else {                         errno_exit ("VIDIOC_QUERYCAP");                 }         }           if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {                 fprintf (stderr, "%s is no video capture device\n",                          dev_name);                 exit (EXIT_FAILURE);         }   switch (io) { case IO_METHOD_READ: if (!(cap.capabilities & V4L2_CAP_READWRITE)) { fprintf (stderr, "%s does not support read i/o\n", dev_name); exit (EXIT_FAILURE); }   break;   case IO_METHOD_MMAP: case IO_METHOD_USERPTR: if (!(cap.capabilities & V4L2_CAP_STREAMING)) { fprintf (stderr, "%s does not support streaming i/o\n", dev_name); exit (EXIT_FAILURE); }   break; }             /* Select video input, video standard and tune here. memset (&input, 0, sizeof (input));   if (-1 == ioctl (fd, VIDIOC_G_INPUT, &input.index)) {         perror ("VIDIOC_G_INPUT");         exit (EXIT_FAILURE); }   if (-1 == ioctl (fd, VIDIOC_ENUMINPUT, &input)) {         perror ("VIDIOC_ENUM_INPUT");         exit (EXIT_FAILURE); }   if (0 == (input.std & V4L2_PAL_BG)) {         fprintf (stderr, "Oops. B/G PAL is not supported.\n");         exit (EXIT_FAILURE); } */   CLEAR (cropcap);           cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;           if (0 == xioctl (fd, VIDIOC_CROPCAP, &cropcap)) {                 crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;                 crop.c = cropcap.defrect; /* reset to default */                   if (-1 == xioctl (fd, VIDIOC_S_CROP, &crop)) {                         switch (errno) {                         case EINVAL:                                 /* Cropping not supported. */                                 break;                         default:                                 /* Errors ignored. */                                 break;                         }                 }         } else {                 /* Errors ignored. */         }             CLEAR (fmt);           fmt.type                = V4L2_BUF_TYPE_VIDEO_CAPTURE;         fmt.fmt.pix.width       = dev_width;         fmt.fmt.pix.height      = dev_height;         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;         fmt.fmt.pix.field       = V4L2_FIELD_INTERLACED;           if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt))                 errno_exit ("VIDIOC_S_FMT");           /* Note VIDIOC_S_FMT may change width and height. */   /* Buggy driver paranoia. */ min = fmt.fmt.pix.width * 2; if (fmt.fmt.pix.bytesperline < min) fmt.fmt.pix.bytesperline = min; min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height; if (fmt.fmt.pix.sizeimage < min) fmt.fmt.pix.sizeimage = min;   switch (io) { case IO_METHOD_READ: init_read (fmt.fmt.pix.sizeimage); break;   case IO_METHOD_MMAP: init_mmap (); break;   case IO_METHOD_USERPTR: init_userp (fmt.fmt.pix.sizeimage); break; } }   void close_device(void) {         if (-1 == close (fd))         errno_exit ("close");           fd = -1; }   void open_device(void) {         struct stat st;           if (-1 == stat (dev_name, &st)) {                 fprintf (stderr, "Cannot identify '%s': %d, %s\n",                          dev_name, errno, strerror (errno));                 exit (EXIT_FAILURE);         }           if (!S_ISCHR (st.st_mode)) {                 fprintf (stderr, "%s is no device\n", dev_name);                 exit (EXIT_FAILURE);         }           fd = open (dev_name, O_RDWR /* required */ | O_NONBLOCK, 0);           if (-1 == fd) {                 fprintf (stderr, "Cannot open '%s': %d, %s\n",                          dev_name, errno, strerror (errno));                 exit (EXIT_FAILURE);         } }   //Convert from YUV 4:2:2 to RGB24 format! void yuyv_to_rgb24 (int width, int height, unsigned int *src, unsigned char *dst) {    unsigned char *s;    unsigned char *d;    int l, c;    int r, g, b, cr, cg, cb, y1, y2;       l = height;    s = src;    d = dst;    while (l--) {       c = width >> 1;       while (c--) {          y1 = *s++;          cb = ((*s - 128) * 454) >> 8;          cg = (*s++ - 128) * 88;          y2 = *s++;          cr = ((*s - 128) * 359) >> 8;          cg = (cg + (*s++ - 128) * 183) >> 8;            r = y1 + cr;          b = y1 + cb;          g = y1 - cg;          r=limit(r,0,255);          g=limit(g,0,255);          b=limit(b,0,255);     *d++ = r; *d++ = g; *d++ = b;            r = y2 + cr;          b = y2 + cb;          g = y2 - cg;          r=limit(r,0,255);          g=limit(g,0,255);          b=limit(b,0,255);   *d++ = r; *d++ = g; *d++ = b;       }    } }   int limit(int val, int min, int max) { if(val<min) return min; if(val>max) return max; return val; }

I’ve played with this all day and still the defined Externs refuse to be recognized

[Mark SiblyKeymaster]

You need a .h file that declares the externs, and the monkey2 code needs to import that too, eg:

Monkey

// file v412.h - contains declarations only. // #ifndef BB_V412_H #define BB_V412_H #ifdef __cplusplus extern "C"{ #endif extern char *dev_name; extern void init_device(); ...etc... #ifdef __cplusplus } #endif #endif // file v412.c - contains definitions, ie: actual code // #include "v412.h" char *dev_name; void init_device(){ } ...etc... ' file v412.monkey2 #import "v412.c" #import "v412.h" ...etc...

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

// file v412.h - contains declarations only. // #ifndef BB_V412_H #define BB_V412_H   #ifdef __cplusplus extern "C"{ #endif   extern char *dev_name;   extern void init_device();   ...etc...   #ifdef __cplusplus } #endif   #endif       // file v412.c - contains definitions, ie: actual code // #include "v412.h"   char *dev_name;   void init_device(){ }   ...etc...       ' file v412.monkey2   #import "v412.c" #import "v412.h"   ...etc...

The weird #ifdef __cplusplus stuff is necessary because c and c++ ‘mangle’ names differently. If you make the c file a cpp file instead, you can ditch this.

Also, you might want to prefix all the native code idents with ‘v412_’ or something to prevent potential name clashes with other native code.

[Simon ArmstrongParticipant]

From a quick browse I would change Extern Public to plain Extern and add a header file.

In monkey2, importing “v4l2.c” adds that file to a list for compiling and linking but I’m pretty sure monkey2 needs an additional “v4l2.h” file to be able to compile your monkey2 code.

 

Oops too late.

[jondecker76Participant]

Thanks guys, I knew it was going to be something that makes a lot of sense once I heard it!

[Author]

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