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.