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Re: libwy-0.69.4 is released

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On Mon, 2024-12-30 at 21:37 +0800, wij wrote:
> With the support of Packet Based Protocol in this version, I think the function
> of c++std library is no way to catch up (it relates to 'process', graphics and
> file format, just function side). https://sourceforge.net/projects/cscall/
> 
> Take the 'graphics' for example, "Small is beauty":
> 
> ------- manpage of namespace Face
> Wy(3wy)                                                                 Wy(3wy)
> 
> NAME
>        Face - namespace of utilities based on Packet-Based communication Proto‐
>        col
> 
> SYNOPSIS
>        Except  POD  types, C structures, particularly marked, all types are de‐
>        clared in namespace Wy.
> 
>        #include <CSCall/Face.h>
> 
>        Namespace Face  provides  basic  utilities  for  the  implement  of  PBP
>        (Packet-based  communication  Protocol), particularly for graphics capa‐
>        bilities (but, it actually does more than graphics).  For full GUI,  ap‐
>        plications  just  need  to  define  their  own  'GUI  language'  between
>        processes.
> 
>        namespace Face {
>         constexpr WeeStr RGB32("RGB32")
>         typedef Vect<unsigned char,4> RGB32_Pixel
>         constexpr RGB32_Pixel RGB32_White
>         constexpr RGB32_Pixel RGB32_Blue
>         constexpr RGB32_Pixel RGB32_Green
>         constexpr RGB32_Pixel RGB32_Red
>         constexpr RGB32_Pixel RGB32_Black
> 
>         constexpr unsigned int LeftButton
>         constexpr unsigned int MiddleButton
>         constexpr unsigned int RightButton
> 
>         constexpr size_t HeadPktSize=16
>         char* write_headpkt(char*, size_t)
>         const char* getsize_from_headpkt(const char*, size_t&)
> 
>         String mkpkt_RS(size_t, int, int, WeeStr)
>         String mkpkt_MO(size_t, WeeStr, int, int, unsigned int)
> 
>         class Receiver (ref. Face.Receiver(3wy))
> 
>         Errno put_image(ByteFlow&, const Hdr2D<const RGB32_Pixel>&)
>         Errno put_image(ByteFlow&, const RGB32_Pixel*, unsigned  int,  unsigned
>        int) };
> 
> ---- [cut]
> 
> 

A short example for video display (webcam, maybe):

/* Copyright is licensed by GNU LGPL, see file COPYING.       by I.J.Wang 2010

  Get and display image frames from v4l2 device (webcam...)

  Build: make q_v4l2

  Note: If error message says "No space left on device"(ENOSPC), try plug to
        different USB port (it is probably the bandwidth problem).
*/
#include <Wy.stdio.h>
#include <Wy.stdlib.h>
#include <CSCall/Array2D.h>
#include <CSCall/Face.h>
#include "V4L2Capture.h"

using namespace Wy;

typedef Face::RGB32_Pixel Pixel;

const char GrSvr[]="../face/face";

const char* find_any_v4l_device()
{
 const char* flist[]={"/dev/video","/dev/video0","/dev/video1","/dev/vdieo2"};
 for(size_t i=0; i<WY_CARRLEN(flist); ++i) {
   if(Wy::access(flist[i],F_OK)==Ok) {
     return flist[i];
   }
 }
 return NULL;
};

void capture_video(const char* dpath, unsigned int cap_w, unsigned int cap_h) {
 Errno r;
 V4L2Capture v4l2dev(dpath,cap_w,cap_h);
 Array2D<Pixel> img(v4l2dev.frame_width(),v4l2dev.frame_height());

 if((r=v4l2dev.start_capture(V4L2Capture::RGB32))!=Ok) {
   WY_THROW(r);
 }

 ProcessID cpid;
 FifoFile frd,fwr;
 if((r=popen(GrSvr,cpid,frd,fwr))!=Ok) {
   WY_THROW(r);
 }

 for(;;) {
   if((r=v4l2dev.capture(img.header()))!=Ok) {
     WY_THROW(r);
   }
   if((r=Face::put_image(fwr, img.header()))!=Ok) {
     WY_THROW(r);
   }
 }
};

int main(int argc, char *argv[])
try {
 const char* devfile=find_any_v4l_device();

 if(devfile==NULL) {
   cerr << "V4L device is not found" WY_ENDL;
   return -1;
 }
 capture_video(devfile,1600,1200);

 return 0;
}
catch(const Errno& e) {
 cerr << wrd(e) << WY_ENDL;
 return -1;  // e.c_errno();
}
catch(...) {
 cerr << "main() caught(...)" WY_ENDL;
 throw;
};

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libwy-0.69.4 is released wij <wyniijj5@gmail.com> - 2024-12-30 21:37 +0800
  Re: libwy-0.69.4 is released wij <wyniijj5@gmail.com> - 2024-12-30 21:41 +0800

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