rllib  1
Public Member Functions | Public Attributes | Private Attributes | List of all members
rlWebcam Class Reference

#include <rlwebcam.h>

Collaboration diagram for rlWebcam:
Collaboration graph
[legend]

Public Member Functions

 rlWebcam ()
 
virtual ~rlWebcam ()
 
int setUrl (const char *url)
 
int disconnect ()
 
const char * getSnapshot (int timeout=3000)
 
const char * getFrame (int timeout=3000, int requestOnly=0)
 
int getFrameBuffer (unsigned char *buffer, int maxbuffer, int timeout=3000)
 
const char * getUrl ()
 
const char * getHost ()
 
int getPort ()
 
const char * getPath ()
 

Public Attributes

int debug
 
rlString filename
 
rlSocket * sock
 

Private Attributes

rlString url
 
rlString temp1
 
rlString temp2
 
rlString temp3
 

Detailed Description

class for handling networked webcams over http:// that use motion jpeg
If you do not know under which URL your webcam provides the M-JPEG video stream
you may use tcpdump to figure it out.
Example:
tcpdump -X -i eth0 -t -q -s 0 "host 192.168.1.200 && port 80" | grep -A 10 GET
IP myhost.46727 > 192.168.1.200.http: tcp 97
 0x0000:  4500 0089 edb6 4000 4006 c891 c0a8 010e  E.............
 0x0010:  c0a8 01c8 b687 0050 d99f 8b7d 0003 d5b2  .......P...}....
 0x0020:  5018 16d0 2460 0000 4745 5420 2f63 6769  P...$`..GET./cgi
 0x0030:  2d62 696e 2f53 7472 6561 6d3f 5669 6465  -bin/Stream?Vide
 0x0040:  6f20 4175 7468 6f72 697a 6174 696f 6e3a  o.Authorization:
 0x0050:  2042 6173 6963 2059 5752 7461 5734 3663  .Basic.YWRtaW46c
 0x0060:  4746 7a63 3364 7663 6d51 3d3f 7765 6263  GFzc3dvcmQ=?webc
 0x0070:  616d 5057 443d 526f 6f74 436f 6f6b 6965  amPWD=RootCookie
 0x0080:  3030 3030 300d 0a0d 0a                   00000....
Usage example for pvbrowser slot functions:
#include "rlwebcam.h"
typedef struct // (todo: define your data structure here)
{
  rlWebcam webcamBig;
}
DATA;
static int slotInit(PARAM *p, DATA *d)
{
  if(p == NULL || d == NULL) return -1;
  p->sleep = 20;
  p->force_null_event = 0;
  d->webcamBig.debug = 0;
  d->webcamBig.filename.printf("%swebcam.jpg", p->file_prefix);
  d->webcamBig.setUrl("http://192.168.1.200/cgi-bin/Stream?Video Authorization: Basic YWRtaW46cGFzc3dvcmQ=?webcamPWD=RootCookie00000");
  return 0;
}
static int slotNullEvent(PARAM *p, DATA *d)
{
  if(p == NULL || d == NULL) return -1;
  if(const char *fname = d->webcamBig.getFrame()) // OR if(const char *fname = d->webcamBig.getSnapshot()) 
  {
    pvDownloadFileAs(p,fname,"webcam.jpg");
    pvSetImage(p,WebcamBig,"webcam.jpg"); // WebcamBig is a pvQImage object that accepts jpeg images
  }
  return 0;
}
 

Definition at line 77 of file rlwebcam.h.


Constructor & Destructor Documentation



◆ rlWebcam()






      

        

          rlWebcam::rlWebcam 
          (
          )
          
        

      





Definition at line 18 of file rlwebcam.cpp.


   19 {
   20   debug = 0;
   21   sock = NULL;
   22 }
rlWebcam::debug
int debug
Definition: rlwebcam.h:91


rlWebcam::sock
rlSocket * sock
Definition: rlwebcam.h:93









◆ ~rlWebcam()








  

  
      

        

          rlWebcam::~rlWebcam 
          (
          )
          
        

      

  		
  
virtual  
  







Definition at line 24 of file rlwebcam.cpp.


   25 {
   26   if(sock != NULL) delete sock;
   27 }
rlWebcam::sock
rlSocket * sock
Definition: rlwebcam.h:93








Member Function Documentation



◆ disconnect()






      

        

          int rlWebcam::disconnect 
          (
          )
          
        

      





Definition at line 40 of file rlwebcam.cpp.


   41 {
   42   if(sock == NULL) return -1;
   43   if(sock->isConnected()) sock->disconnect();
   44   return 0;
   45 }
rlSocket::disconnect
int disconnect()
Definition: rlsocket.cpp:545


rlSocket::isConnected
int isConnected()
Definition: rlsocket.cpp:559


rlWebcam::sock
rlSocket * sock
Definition: rlwebcam.h:93









◆ getFrame()






      

        

          const char * rlWebcam::getFrame 
          (
          int 
          timeout = 3000, 
        

        

          
          
          int 
          requestOnly = 0 
        

        

          
          )
          
        

      





Definition at line 60 of file rlwebcam.cpp.


   61 {
   62   unsigned char c1,c2;
   63   unsigned char buffer[1024*1024];
   64 
   65   if(sock == NULL)
   66   {
   67     printf("rlWebcam::ERROR sock==NULL\n");
   68     return NULL;
   69   }
   70   if(sock->isConnected() == 0) 
   71   {
   72     sock->connect();
   73     sock->printf("GET /%s%c%c%c%c",getPath(),0x0d,0x0a,0x0d,0x0a);
   74   }  
   75   if(sock->isConnected() == 0)
   76   {
   77     printf("rlWebcam::ERROR sock->isConnected() == 0\n");
   78     return NULL;
   79   }
   80 
   81   // read http header
   82   char line[256];
   83   while(1)
   84   {
   85     if(sock->readStr(line,(int) sizeof(line)-1,timeout) < 1) return NULL;
   86     if(debug) printf("getFrame:: Header:%s",line);
   87     if(strncmp(line,"Content-Length:",15) == 0) break;    
   88   }
   89   
   90   int len = 0;
   91   sscanf(line,"Content-Length: %d", &len);
   92   if(debug) printf("getFrame:: len=%d\n",len);
   93   if(len > (int) (sizeof(buffer) - 1)) return NULL;
   94 
   95   if(requestOnly) return NULL;
   96   // search for startOfImage
   97   while(1)
   98   {
   99     if(sock->read(&c1,1,timeout) < 1) return NULL;
  100     if(debug) printf("%02x ", c1);
  101     if(c1 == 0x0ff)
  102     {
  103       if(sock->read(&c2,1,timeout) < 1) return NULL;
  104       if(debug) printf("%02x ", c2);
  105       if(c2 == 0x0d8)
  106       {
  107         if(debug) printf("\nrlWebcam::Found startOfImage\n");
  108         break;
  109       }
  110     }
  111   }
  112 
  113   // open output file
  114   if(filename.text() == NULL)
  115   {
  116     printf("rlWebcam::ERROR you forgot to set filename\n");
  117     return NULL;
  118   }
  119   FILE *fout = fopen(filename.text(),"w");
  120   if(fout == NULL)
  121   {
  122     printf("rlWebcam::ERROR could not write file %s\n", filename.text());
  123     return NULL;
  124   }
  125   //fputc(c1, fout);
  126   //fputc(c2, fout);
  127 
  128   int ind = 0;
  129   buffer[ind++] = c1;
  130   buffer[ind++] = c2;
  131   len = sock->read(&buffer[2],len-2,timeout);
  132   //len = recv(sock->s,&buffer[2],len-2,MSG_WAITALL);
  133   if(len < 1) return NULL;
  134   ind = len + 2;
  135 
  136   fwrite(buffer, ind, 1, fout);
  137 
  138   /*
  139   // read until endOfImage
  140   while(1)
  141   {
  142     //if(sock->read(&c1,1,timeout) < 1) return NULL;
  143     if(recv(sock->s,&c1,1,0) < 1) return NULL;
  144     fputc(c1, fout);
  145     if(debug) printf("%02x ", c1);
  146     if(c1 == 0x0ff)
  147     {
  148       //if(sock->read(&c2,1,timeout) < 1) return NULL;
  149       if(recv(sock->s,&c2,1,0) < 1) return NULL;
  150       fputc(c2, fout);
  151       if(debug) printf("%02x ", c2);
  152       if(c2 == 0x0d9)
  153       {
  154         if(debug) printf("\nrlWebcam::Found endOfImage\n");
  155         break;
  156       }
  157     }
  158   }
  159   */
  160 
  161   // close output file
  162   fclose(fout);
  163   return filename.text();
  164 }
rlSocket::readStr
int readStr(char *buf, int len, int timeout=0)
Definition: rlsocket.cpp:224


rlString::text
char * text()
Definition: rlstring.cpp:126


rlWebcam::getPath
const char * getPath()
Definition: rlwebcam.cpp:301


rlSocket::read
int read(void *buf, int len, int timeout=0)
Definition: rlsocket.cpp:191


rlWebcam::debug
int debug
Definition: rlwebcam.h:91


rlWebcam::filename
rlString filename
Definition: rlwebcam.h:92


rlSocket::connect
int connect()
Definition: rlsocket.cpp:321


rlSocket::isConnected
int isConnected()
Definition: rlsocket.cpp:559


rlWebcam::sock
rlSocket * sock
Definition: rlwebcam.h:93


rlSocket::printf
int printf(const char *format,...)
Definition: rlsocket.cpp:586









◆ getFrameBuffer()






      

        

          int rlWebcam::getFrameBuffer 
          (
          unsigned char * 
          buffer, 
        

        

          
          
          int 
          maxbuffer, 
        

        

          
          
          int 
          timeout = 3000 
        

        

          
          )
          
        

      





Definition at line 166 of file rlwebcam.cpp.


  167 {
  168   unsigned char c1,c2;
  169 
  170   if(sock == NULL)
  171   {
  172     printf("rlWebcam::ERROR sock==NULL\n");
  173     return -1;
  174   }
  175   if(sock->isConnected() == 0) 
  176   {
  177     sock->connect();
  178     sock->printf("GET /%s%c%c%c%c",getPath(),0x0d,0x0a,0x0d,0x0a);
  179   }  
  180   if(sock->isConnected() == 0)
  181   {
  182     printf("rlWebcam::ERROR sock->isConnected() == 0\n");
  183     return -2;
  184   }
  185 
  186   // read http header
  187   char line[256];
  188   while(1)
  189   {
  190     if(sock->readStr(line,(int) sizeof(line)-1,timeout) < 1) return -1;
  191     if(debug) printf("getFrameBuffer:: Header:%s",line);
  192     if(strncmp(line,"Content-Length:",15) == 0) break;    
  193   }
  194   
  195   int len = 0;
  196   sscanf(line,"Content-Length: %d", &len);
  197   if(debug) printf("getFrameBuffer:: len=%d\n",len);
  198 
  199   // search for startOfImage
  200   while(1)
  201   {
  202     if(sock->read(&c1,1,timeout) < 1) return -3;
  203     if(debug) printf("%02x ", c1);
  204     if(c1 == 0x0ff)
  205     {
  206       if(sock->read(&c2,1,timeout) < 1) return -4;
  207       if(debug) printf("%02x ", c2);
  208       if(c2 == 0x0d8)
  209       {
  210         if(debug) printf("\nrlWebcam::Found startOfImage\n");
  211         break;
  212       }
  213     }
  214   }
  215 
  216   int ind = 0;
  217   buffer[ind++] = c1;
  218   buffer[ind++] = c2;
  219   len = sock->read(&buffer[2],len-2,timeout);
  220   //len = recv(sock->s,&buffer[2],len-2,MSG_WAITALL);
  221   if(len < 1) return -5;
  222   ind = len + 2;
  223 
  224   /*
  225   // read until endOfImage
  226   while(1)
  227   {
  228     //if(sock->read(&c1,1,timeout) < 1) return -5;
  229     if(recv(sock->s,&c1,1,0) < 1) return -5;
  230     //fputc(c1, fout);
  231     buffer[ind++] = c1;
  232     if(ind >= maxbuffer) return -5;
  233     if(debug) printf("%02x ", c1);
  234     if(c1 == 0x0ff)
  235     {
  236       //if(sock->read(&c2,1,timeout) < 1) return -6;
  237       if(recv(sock->s,&c2,1,0) < 1) return -6;
  238       //fputc(c2, fout);
  239       buffer[ind++] = c2;
  240       if(ind >= maxbuffer) return -7;
  241       if(debug) printf("%02x ", c2);
  242       if(c2 == 0x0d9)
  243       {
  244         if(debug) printf("\nrlWebcam::Found endOfImage\n");
  245         break;
  246       }
  247     }
  248   }
  249 
  250   // close output file
  251   // fclose(fout);
  252   */
  253 
  254   return ind;
  255 }
rlSocket::readStr
int readStr(char *buf, int len, int timeout=0)
Definition: rlsocket.cpp:224


rlWebcam::getPath
const char * getPath()
Definition: rlwebcam.cpp:301


rlSocket::read
int read(void *buf, int len, int timeout=0)
Definition: rlsocket.cpp:191


rlWebcam::debug
int debug
Definition: rlwebcam.h:91


rlSocket::connect
int connect()
Definition: rlsocket.cpp:321


rlSocket::isConnected
int isConnected()
Definition: rlsocket.cpp:559


rlWebcam::sock
rlSocket * sock
Definition: rlwebcam.h:93


rlSocket::printf
int printf(const char *format,...)
Definition: rlsocket.cpp:586









◆ getHost()






      

        

          const char * rlWebcam::getHost 
          (
          )
          
        

      





Definition at line 262 of file rlwebcam.cpp.


  263 {
  264   if(url.startsWith("http://") == 0)
  265   {
  266     printf("rlWebcam::wrong url syntax in %s\n", url.text());
  267     printf("url syntax: http://host:port/path_to_webcam_cgi_script\n");
  268     return NULL;
  269   }
  270   char *cptr = url.text();
  271   cptr += 7;
  272   temp1.setText(cptr);
  273   cptr = temp1.strchr('/');
  274   if(cptr != NULL) *cptr = '\0';
  275   cptr = temp1.strchr(':');
  276   if(cptr != NULL) *cptr = '\0';
  277   if(debug) printf("rlWebcam:host=%s\n", temp1.text());
  278   return temp1.text();
  279 }
rlString::startsWith
int startsWith(const char *startstr)
Definition: rlstring.cpp:198


rlString::text
char * text()
Definition: rlstring.cpp:126


rlWebcam::debug
int debug
Definition: rlwebcam.h:91


rlString::setText
int setText(const char *text)
Definition: rlstring.cpp:136


rlString::strchr
char * strchr(int c)
Definition: rlstring.cpp:223


rlWebcam::url
rlString url
Definition: rlwebcam.h:96


rlWebcam::temp1
rlString temp1
Definition: rlwebcam.h:96









◆ getPath()






      

        

          const char * rlWebcam::getPath 
          (
          )
          
        

      





Definition at line 301 of file rlwebcam.cpp.


  302 {
  303   if(url.startsWith("http://") == 0)
  304   {
  305     printf("rlWebcam::wrong url syntax in %s\n", url.text());
  306     printf("url syntax: http://host:port/path_to_webcam_cgi_script\n");
  307     return NULL;
  308   }
  309   char *cptr = url.text();
  310   cptr += 7;
  311   temp3.setText(cptr);
  312   cptr = temp3.strchr('/');
  313   if(cptr == NULL) return "";
  314   cptr++;
  315   if(debug) printf("rlWebcam:path=%s\n", cptr);
  316   return cptr;
  317 }
rlString::startsWith
int startsWith(const char *startstr)
Definition: rlstring.cpp:198


rlWebcam::temp3
rlString temp3
Definition: rlwebcam.h:96


rlString::text
char * text()
Definition: rlstring.cpp:126


rlWebcam::debug
int debug
Definition: rlwebcam.h:91


rlString::setText
int setText(const char *text)
Definition: rlstring.cpp:136


rlString::strchr
char * strchr(int c)
Definition: rlstring.cpp:223


rlWebcam::url
rlString url
Definition: rlwebcam.h:96









◆ getPort()






      

        

          int rlWebcam::getPort 
          (
          )
          
        

      





Definition at line 281 of file rlwebcam.cpp.


  282 {
  283   int port = 80;
  284   if(url.startsWith("http://") == 0)
  285   {
  286     printf("rlWebcam::wrong url syntax in %s\n", url.text());
  287     printf("url syntax: http://host:port/path_to_webcam_cgi_script\n");
  288     return -1;
  289   }
  290   char *cptr = url.text();
  291   cptr += 7;
  292   temp2.setText(cptr);
  293   cptr = temp2.strchr('/');
  294   if(cptr != NULL) *cptr = '\0';
  295   cptr = temp2.strchr(':');
  296   if(cptr != NULL) sscanf(cptr,":%d", &port);
  297   if(debug) printf("rlWebcam:port=%d\n", port);
  298   return port;
  299 }
rlString::startsWith
int startsWith(const char *startstr)
Definition: rlstring.cpp:198


rlWebcam::temp2
rlString temp2
Definition: rlwebcam.h:96


rlString::text
char * text()
Definition: rlstring.cpp:126


rlWebcam::debug
int debug
Definition: rlwebcam.h:91


rlString::setText
int setText(const char *text)
Definition: rlstring.cpp:136


rlString::strchr
char * strchr(int c)
Definition: rlstring.cpp:223


rlWebcam::url
rlString url
Definition: rlwebcam.h:96









◆ getSnapshot()






      

        

          const char * rlWebcam::getSnapshot 
          (
          int 
          timeout = 3000)
          
        

      





Definition at line 47 of file rlwebcam.cpp.


   48 {
   49   if(sock == NULL)
   50   {
   51     printf("rlWebcam::ERROR sock==NULL\n");
   52     return NULL;
   53   }
   54   if(sock->isConnected()) sock->disconnect();
   55   const char *cptr = getFrame(timeout);
   56   sock->disconnect();
   57   return cptr;
   58 }
rlWebcam::getFrame
const char * getFrame(int timeout=3000, int requestOnly=0)
Definition: rlwebcam.cpp:60


rlSocket::disconnect
int disconnect()
Definition: rlsocket.cpp:545


rlSocket::isConnected
int isConnected()
Definition: rlsocket.cpp:559


rlWebcam::sock
rlSocket * sock
Definition: rlwebcam.h:93









◆ getUrl()






      

        

          const char * rlWebcam::getUrl 
          (
          )
          
        

      





Definition at line 257 of file rlwebcam.cpp.


  258 {
  259   return url.text();
  260 }
rlString::text
char * text()
Definition: rlstring.cpp:126


rlWebcam::url
rlString url
Definition: rlwebcam.h:96









◆ setUrl()






      

        

          int rlWebcam::setUrl 
          (
          const char * 
          url)
          
        

      





Definition at line 29 of file rlwebcam.cpp.


   30 {
   31   if(urlstr == NULL) return -1;
   32   url.setText(urlstr);
   33   if(sock != NULL) delete sock;
   34   sock = NULL;
   35   if(getHost() == NULL || getPort() < 0) return -1;
   36   sock = new rlSocket(getHost(),getPort(),1);
   37   return 0;
   38 }


rlWebcam::getPort
int getPort()
Definition: rlwebcam.cpp:281


rlString::setText
int setText(const char *text)
Definition: rlstring.cpp:136


rlWebcam::getHost
const char * getHost()
Definition: rlwebcam.cpp:262


rlWebcam::url
rlString url
Definition: rlwebcam.h:96


rlWebcam::sock
rlSocket * sock
Definition: rlwebcam.h:93








Member Data Documentation



◆ debug






      

        

          int rlWebcam::debug
        

      





Definition at line 91 of file rlwebcam.h.








◆ filename






      

        

          rlString rlWebcam::filename
        

      





Definition at line 92 of file rlwebcam.h.








◆ sock






      

        

          rlSocket* rlWebcam::sock
        

      





Definition at line 93 of file rlwebcam.h.








◆ temp1








  

  
      

        

          rlString rlWebcam::temp1
        

      

  		
  
private  
  







Definition at line 96 of file rlwebcam.h.








◆ temp2








  

  
      

        

          rlString rlWebcam::temp2
        

      

  		
  
private  
  







Definition at line 96 of file rlwebcam.h.








◆ temp3








  

  
      

        

          rlString rlWebcam::temp3
        

      

  		
  
private  
  







Definition at line 96 of file rlwebcam.h.








◆ url








  

  
      

        

          rlString rlWebcam::url
        

      

  		
  
private  
  







Definition at line 96 of file rlwebcam.h.







The documentation for this class was generated from the following files:





Generated by  
doxygen
 1.8.14