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live qcam video on web: server push

web_qcam.c

cgi-bin that provides the possibility to show continuously
qcam frames on a www page using "server push".

Sample site: http://fsai.trier.fh-rpl.de/system

Juergen Schmitz
Thomas Wagner


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#if 0
gcc web_qcam.c -o web_qcam
exit
#endif


/*
 * web_qcam.c: Quick hack to play a sequence of qcam pictures.
 * 
 * Thomas Wagner (wagner@fsai.trier.fh-rpl.de)
 * Juergen Schmitz (schmitzj@fsai.trier.fh-rpl.de)
 *
 * This code is released into the public domain.  Do whatever 
 * you want with it.
 * 
 *********************************************************************
 *
 * Based on doit.c written by Rob McCool
 *
 *
 * Requirements:
 *  You need netpbm and qcam, of cause ;-)
 *
 * Installation:
 *  1 change QCAMPATH, PBMPATH, FRAMES and DELAY to your needs
 *     QCAMPATH: path to "qcam"
 *     PBMPATH: path to "ppmtogif"
 *     FRAMES: max shown frames
 *     DELAY: pause between program loop in microseconds
 *  2 compile with "sh web_qcam.c"
 *  3 copy to your cgi-bin directory
 *  4 set exe flag
 * 
 * Usage:
 *  insert "<img src="/cgi-bin/web_qcam">" into your html document
 * 
 * Advanced Features:
 *  its up to you
 * 
 *********************************************************************
 */

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define QCAMPATH "/usr/local/bin/"
#define PBMPATH "/usr/local/bin/pbm/"

#define FRAMES 100
/* DELAY between frames */
#define DELAY 300000

#define HEADER \
"Content-type: multipart/x-mixed-replace;boundary=ThisRandomString\n" \

#define RANDOMSTRING "\n--ThisRandomString\n"
#define ENDSTRING "\n--ThisRandomString--\n"
#define CTSTRING "Content-type: image/gif\n\n"

int main(int argc, char *argv[])
{
    char    fn[100];
    int     i;

    if(write(STDOUT_FILENO, HEADER, strlen(HEADER)) == -1)
        exit(0);
    if(write(STDOUT_FILENO, RANDOMSTRING, strlen(RANDOMSTRING)) == -1)
        exit(0);

    for(i=0;i<FRAMES;i++)
    {
        if(write(STDOUT_FILENO, CTSTRING, strlen(CTSTRING)) == -1)
            exit(0);
                    /* change to your needs and paths */
        sprintf(fn, QCAMPATH"qcam -B 6|"PBMPATH"ppmtogif 2>/dev/null");
        
	system(fn);

        if(write(STDOUT_FILENO, RANDOMSTRING, strlen(RANDOMSTRING)) == -1)
            exit(0);

        usleep(DELAY);
    }

  return(0);
}
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