c-qcam - Connectix Color QuickCam video4linux kernel driver
Copyright (C) 1999 Dave Forrest <drf5n@virginia.edu>
- released under GNU GPL.
+ released under GNU GPL.
1999-12-08 Dave Forrest, written with kernel version 2.2.12 in mind
CONFIG_PNP_PARPORT M for autoprobe.o IEEE1284 readback module
CONFIG_PRINTER_READBACK M for parport_probe.o IEEE1284 readback module
CONFIG_VIDEO_DEV M for videodev.o video4linux module
- CONFIG_VIDEO_CQCAM M for c-qcam.o Color Quickcam module
+ CONFIG_VIDEO_CQCAM M for c-qcam.o Color Quickcam module
With these flags, the kernel should compile and install the modules.
To record and monitor the compilation, I use:
(make zlilo ; \
make modules; \
- make modules_install ;
+ make modules_install ;
depmod -a ) &>log &
less log # then a capital 'F' to watch the progress
-
+
But that is my personal preference.
2.2 Configuration
-
+
The configuration requires module configuration and device
configuration. I like kmod or kerneld process with the
/etc/modprobe.conf file so the modules can automatically load/unload as
these procedures.
-2.1 Module Configuration
+2.1 Module Configuration
Using modules requires a bit of work to install and pass the
parameters. Understand that entries in /etc/modprobe.conf of:
(CONFIG_PRINTER), the IEEE 1284 system,(CONFIG_PRINTER_READBACK), you
should be able to read some identification from your quickcam with
- modprobe -v parport
- modprobe -v parport_probe
- cat /proc/parport/PORTNUMBER/autoprobe
+ modprobe -v parport
+ modprobe -v parport_probe
+ cat /proc/parport/PORTNUMBER/autoprobe
Returns:
CLASS:MEDIA;
MODEL:Color QuickCam 2.0;
and well. A common problem is that the current driver does not
reliably detect a c-qcam, even though one is attached. In this case,
- modprobe -v c-qcam
+ modprobe -v c-qcam
or
insmod -v c-qcam
3.1 Checklist:
Can you get an image?
- v4lgrab >qcam.ppm ; wc qcam.ppm ; xv qcam.ppm
+ v4lgrab >qcam.ppm ; wc qcam.ppm ; xv qcam.ppm
- Is a working c-qcam connected to the port?
- grep ^ /proc/parport/?/autoprobe
+ Is a working c-qcam connected to the port?
+ grep ^ /proc/parport/?/autoprobe
- Do the /dev/video* files exist?
- ls -lad /dev/video
+ Do the /dev/video* files exist?
+ ls -lad /dev/video
- Is the c-qcam module loaded?
- modprobe -v c-qcam ; lsmod
+ Is the c-qcam module loaded?
+ modprobe -v c-qcam ; lsmod
Does the camera work with alternate programs? cqcam, etc?
isn't, you might try patching the c-qcam module to add a parport=xxx
option as in the bw-qcam module so you can specify the parallel port:
- insmod -v c-qcam parport=0
+ insmod -v c-qcam parport=0
And bypass the detection code, see ../../drivers/char/c-qcam.c and
look for the 'qc_detect' code and call.
this work is documented at the video4linux2 site listed below.
-9.0 --- A sample program using v4lgrabber,
+9.0 --- A sample program using v4lgrabber,
-v4lgrab is a simple image grabber that will copy a frame from the
+This program is a simple image grabber that will copy a frame from the
first video device, /dev/video0 to standard output in portable pixmap
-format (.ppm) To produce .jpg output, you can use it like this:
-'v4lgrab | convert - c-qcam.jpg'
+format (.ppm) Using this like: 'v4lgrab | convert - c-qcam.jpg'
+produced this picture of me at
+ http://mug.sys.virginia.edu/~drf5n/extras/c-qcam.jpg
+
+-------------------- 8< ---------------- 8< -----------------------------
+
+/* Simple Video4Linux image grabber. */
+/*
+ * Video4Linux Driver Test/Example Framegrabbing Program
+ *
+ * Compile with:
+ * gcc -s -Wall -Wstrict-prototypes v4lgrab.c -o v4lgrab
+ * Use as:
+ * v4lgrab >image.ppm
+ *
+ * Copyright (C) 1998-05-03, Phil Blundell <philb@gnu.org>
+ * Copied from http://www.tazenda.demon.co.uk/phil/vgrabber.c
+ * with minor modifications (Dave Forrest, drf5n@virginia.edu).
+ *
+ */
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <stdlib.h>
+
+#include <linux/types.h>
+#include <linux/videodev.h>
+
+#define FILE "/dev/video0"
+
+/* Stole this from tvset.c */
+
+#define READ_VIDEO_PIXEL(buf, format, depth, r, g, b) \
+{ \
+ switch (format) \
+ { \
+ case VIDEO_PALETTE_GREY: \
+ switch (depth) \
+ { \
+ case 4: \
+ case 6: \
+ case 8: \
+ (r) = (g) = (b) = (*buf++ << 8);\
+ break; \
+ \
+ case 16: \
+ (r) = (g) = (b) = \
+ *((unsigned short *) buf); \
+ buf += 2; \
+ break; \
+ } \
+ break; \
+ \
+ \
+ case VIDEO_PALETTE_RGB565: \
+ { \
+ unsigned short tmp = *(unsigned short *)buf; \
+ (r) = tmp&0xF800; \
+ (g) = (tmp<<5)&0xFC00; \
+ (b) = (tmp<<11)&0xF800; \
+ buf += 2; \
+ } \
+ break; \
+ \
+ case VIDEO_PALETTE_RGB555: \
+ (r) = (buf[0]&0xF8)<<8; \
+ (g) = ((buf[0] << 5 | buf[1] >> 3)&0xF8)<<8; \
+ (b) = ((buf[1] << 2 ) & 0xF8)<<8; \
+ buf += 2; \
+ break; \
+ \
+ case VIDEO_PALETTE_RGB24: \
+ (r) = buf[0] << 8; (g) = buf[1] << 8; \
+ (b) = buf[2] << 8; \
+ buf += 3; \
+ break; \
+ \
+ default: \
+ fprintf(stderr, \
+ "Format %d not yet supported\n", \
+ format); \
+ } \
+}
+
+int get_brightness_adj(unsigned char *image, long size, int *brightness) {
+ long i, tot = 0;
+ for (i=0;i<size*3;i++)
+ tot += image[i];
+ *brightness = (128 - tot/(size*3))/3;
+ return !((tot/(size*3)) >= 126 && (tot/(size*3)) <= 130);
+}
+
+int main(int argc, char ** argv)
+{
+ int fd = open(FILE, O_RDONLY), f;
+ struct video_capability cap;
+ struct video_window win;
+ struct video_picture vpic;
+
+ unsigned char *buffer, *src;
+ int bpp = 24, r, g, b;
+ unsigned int i, src_depth;
+
+ if (fd < 0) {
+ perror(FILE);
+ exit(1);
+ }
+
+ if (ioctl(fd, VIDIOCGCAP, &cap) < 0) {
+ perror("VIDIOGCAP");
+ fprintf(stderr, "(" FILE " not a video4linux device?)\n");
+ close(fd);
+ exit(1);
+ }
+
+ if (ioctl(fd, VIDIOCGWIN, &win) < 0) {
+ perror("VIDIOCGWIN");
+ close(fd);
+ exit(1);
+ }
+
+ if (ioctl(fd, VIDIOCGPICT, &vpic) < 0) {
+ perror("VIDIOCGPICT");
+ close(fd);
+ exit(1);
+ }
+
+ if (cap.type & VID_TYPE_MONOCHROME) {
+ vpic.depth=8;
+ vpic.palette=VIDEO_PALETTE_GREY; /* 8bit grey */
+ if(ioctl(fd, VIDIOCSPICT, &vpic) < 0) {
+ vpic.depth=6;
+ if(ioctl(fd, VIDIOCSPICT, &vpic) < 0) {
+ vpic.depth=4;
+ if(ioctl(fd, VIDIOCSPICT, &vpic) < 0) {
+ fprintf(stderr, "Unable to find a supported capture format.\n");
+ close(fd);
+ exit(1);
+ }
+ }
+ }
+ } else {
+ vpic.depth=24;
+ vpic.palette=VIDEO_PALETTE_RGB24;
+
+ if(ioctl(fd, VIDIOCSPICT, &vpic) < 0) {
+ vpic.palette=VIDEO_PALETTE_RGB565;
+ vpic.depth=16;
+
+ if(ioctl(fd, VIDIOCSPICT, &vpic)==-1) {
+ vpic.palette=VIDEO_PALETTE_RGB555;
+ vpic.depth=15;
+
+ if(ioctl(fd, VIDIOCSPICT, &vpic)==-1) {
+ fprintf(stderr, "Unable to find a supported capture format.\n");
+ return -1;
+ }
+ }
+ }
+ }
+
+ buffer = malloc(win.width * win.height * bpp);
+ if (!buffer) {
+ fprintf(stderr, "Out of memory.\n");
+ exit(1);
+ }
+
+ do {
+ int newbright;
+ read(fd, buffer, win.width * win.height * bpp);
+ f = get_brightness_adj(buffer, win.width * win.height, &newbright);
+ if (f) {
+ vpic.brightness += (newbright << 8);
+ if(ioctl(fd, VIDIOCSPICT, &vpic)==-1) {
+ perror("VIDIOSPICT");
+ break;
+ }
+ }
+ } while (f);
+
+ fprintf(stdout, "P6\n%d %d 255\n", win.width, win.height);
+
+ src = buffer;
+
+ for (i = 0; i < win.width * win.height; i++) {
+ READ_VIDEO_PIXEL(src, vpic.palette, src_depth, r, g, b);
+ fputc(r>>8, stdout);
+ fputc(g>>8, stdout);
+ fputc(b>>8, stdout);
+ }
+
+ close(fd);
+ return 0;
+}
+-------------------- 8< ---------------- 8< -----------------------------
10.0 --- Other Information
git://git.onelab.eu / linux-2.6.git / blobdiff