772 lines
21 KiB
Groff
772 lines
21 KiB
Groff
.Dd August 15, 1995
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.br
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.in +0.5i
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.Dt METEOR 4
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.Os FreeBSD
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.Sh NAME
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.Nm meteor
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.Nd video capture driver
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.Sh SYNOPSIS
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.Nm video meteor
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.Sh DESCRIPTION
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The
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.Xr meteor
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driver provides support for a PCI
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.Em video
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capture. It allows the capture of 24 bit RGB, 16 bit RGB and 16 bit YUV
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output formats.
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.Pp
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.Sh Meteor Driver Installation
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To use the Matrox Meteor card in your system, you need a computer
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that support the PCI (preferably the Type 2 or better) interface bus.
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It is recommended that the system has as more than 16 MB of RAM since this
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capture card directly deposits the image to system RAM.
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.Pp
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The files required for Matrox Meteor card are:
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.br
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.in +0.5i
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/sys/pci/meteor.c
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.br
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/sys/i386/include/ioctl_meteor.h (also known as:
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.br
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/usr/include/machine/ioctl_meteor.h)
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.br
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.in -0.5i
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For FreeBSD release versions 2.1 and earlier, the following patch files are also required:
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.br
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.in +0.5i
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meteor/usr/sys/i386/i386/conf.patch
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.br
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meteor/usr/sys/conf/files.patch
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.br
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meteor/sys/i386/conf/LINT.patch
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.br
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These files are available for anonymous ftp at:
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.br
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.in +0.5i
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ftp://joy.cs.ndsu.nodak.edu/pub/meteor.tgz
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.br
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.in -1.0i
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.Pp
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1) In the configuration file, add the line (as shown in
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meteor/usr/sys/i386/conf/LINT.patch):
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.Pp
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.Em device meteor0
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.Pp
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2) There is also a couple of optional parameters you may use
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.Pp
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.Em options "METEOR_ALLOC_PAGES=xxx"
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specifies the number of contiguous pages to allocate when successfully
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probed. The default number of pages allocated by the kernel is 151.
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This means that there are (151*4096) bytes available for use.
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.Pp
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.Em options METEOR_DEALLOC_PAGES
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deallocate all pages when closing the device. Note, the chance of
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contiguously re-allocating new pages are very small. The default
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behavior is to not deallocate pages.
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.Pp
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.Em options "METEOR_DEALLOC_ABOVE=xxx"
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deallocate all pages above the specified number. The default action is
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to not deallocate above any pages.
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.Pp
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3) Make and install the kernel.
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.Pp
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4) Make the special file name:
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.Pp
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.Em mknod /dev/meteor0 c <major> 0
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The major number is determined by the placement of the device in conf.c.
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The patch supplied with the driver will make the major number 67.
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.Pp
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.Sh Meteor Capture Modes
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The Meteor capture driver has three modes of capture operation.
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.Pp
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1) Conventional read(2) interface.
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.in +0.5i
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.Pp
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This mode is the easiest and slowest to use. This mode is great for
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capturing a single field at little programming cost.
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.Pp
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In this mode, the user opens the device, set the capture mode
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and size (See: METEORSETGEO ioctl call), and uses the read system
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call to load the data into a buffer.
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.Pp
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meteor_read.c; read 400x300 RGB24 into a viewable PPM file
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.Pp
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.in -0.5i
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.nf
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#include <sys/fcntl.h>
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#include <machine/ioctl_meteor.h>
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extern int errno;
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#define ROWS 300
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#define COLS 400
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#define SIZE (ROWS * COLS * 4)
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main()
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{
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struct meteor_geomet geo;
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char buf[SIZE],b[4],header[16],*p;
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int i,o,c;
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if ((i = open("/dev/meteor0", O_RDONLY)) < 0) {
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printf("open failed: %d\n", errno);
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exit(1);
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}
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/* set up the capture type and size */
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geo.rows = ROWS;
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geo.columns = COLS;
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geo.frames = 1;
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geo.oformat = METEOR_GEO_RGB24 ;
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if (ioctl(i, METEORSETGEO, &geo) < 0) {
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printf("ioctl failed: %d\n", errno);
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exit(1);
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}
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c = METEOR_FMT_NTSC;
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if (ioctl(i, METEORSFMT, &c) < 0) {
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printf("ioctl failed: %d\n", errno);
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exit(1);
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}
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c = METEOR_INPUT_DEV0;
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if (ioctl(i, METEORSINPUT, &c) < 0) {
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printf("ioctl failed: %d\n", errno);
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exit(1);
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}
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if ((c=read(i, &buf[0], SIZE)) < SIZE) {
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printf("read failed %d %d %d\n", c, i, errno);
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close(i);
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exit(1);
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}
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close(i);
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if ((o = open("rgb24.ppm", O_WRONLY | O_CREAT, 0644)) < 0) {
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printf("ppm open failed: %d\n", errno);
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exit(1);
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}
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/* make PPM header and save to file */
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strcpy(&header[0], "P6 400 300 255 ");
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header[2] = header[6] = header[10] = header[14] = '\n';
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write (o, &header[0], 15);
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/* save the RGB data to PPM file */
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for (p = &buf[0]; p < &buf[SIZE]; ) {
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b[2] = *p++; /* blue */
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b[1] = *p++; /* green */
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b[0] = *p++; /* red */
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*p++; /* NULL byte */
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write(o,&b[0], 3); /* not very efficient */
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}
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close(o);
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exit(0);
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}
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.if
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.Pp
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2) Memory mapped single capture or unsynchronized continuous capture.
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.in +0.5i
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.Pp
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The single capture mode is designed for conferencing tools such as nv.
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These tools need to control the starting of the image capture and also
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need several frames a second. The continuous capture mode is designed
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for applications that want free-running data.
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.Pp
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In this mode, the user opens the device, set the capture mode
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and size (See: METEORSETGEO ioctl call), memory maps the frame buffer
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memory into the user process space, and issues either the
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single-capture or the continuous capture call (See: METEORCAPTUR ioctl
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call) to load the data into the memory mapped buffer.
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.Pp
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As explained in the METEORCAPTUR ioctl call, the single frame capture
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ioctl will block until the capture is complete, the continuous capture
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will return immediately.
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.in -0.5i
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.Pp
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meteor_mmap_single_continuous.c
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.Pp
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.nf
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/fcntl.h>
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#include <machine/ioctl_meteor.h>
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extern int errno;
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#define ROWS 480
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#define COLS 640
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#define SIZE (ROW * COLS * 2)
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main()
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{
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struct meteor_geomet geo;
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char buf[SIZE];
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char *mmbuf;
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int i,c;
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if ((i = open("/dev/meteor0", O_RDONLY)) < 0) {
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printf("open failed\n");
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exit(1);
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}
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geo.rows = ROWS;
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geo.columns = COLS;
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geo.frames = 1;
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geo.oformat = METEOR_GEO_RGB16 ;
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if (ioctl(i, METEORSETGEO, &geo) < 0) {
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printf("ioctl failed: %d\n", errno);
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exit(1);
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}
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c = METEOR_FMT_NTSC;
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if (ioctl(i, METEORSFMT, &c) < 0) {
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printf("ioctl failed: %d\n", errno);
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exit(1);
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}
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c = METEOR_INPUT_DEV0;
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if (ioctl(i, METEORSINPUT, &c) < 0) {
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printf("ioctl failed: %d\n", errno);
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exit(1);
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}
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mmbuf=(char *)mmap((caddr_t)0, SIZE, PROT_READ, 0, i, (off_t)0);
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#ifdef SINGLE_MODE
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/* single frame capture */
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c = METEOR_CAP_SINGLE ;
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ioctl(i, METEORCAPTUR, &c); /* wait for the frame */
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/* directly access the frame buffer array data in mmbuf */
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#else
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/* continuous frame capture */
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c = METEOR_CAP_CONTINOUS ;
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ioctl(i, METEORCAPTUR, &c); /* returns immediately */
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/* directly access the frame buffer array data in mmbuf */
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c = METEOR_CAP_STOP_CONT ;
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ioctl(i, METEORCAPTUR, &c); /* close will also stop capture */
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#endif
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close(i);
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exit(0);
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}
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.if
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.Pp
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3) Memory mapped, multi-frame ring buffer synchronize capture.
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.Pp
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.in +0.5i
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This continuous capture mode is synchronized with the application that
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processes up to 32 frames. This gives the advantages of both single and
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continuous capture modes.
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.Pp
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The kernel notifies the application of a new data by raising an
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application defined signal. The driver also shares a structure with
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the application that allows them to communicate which frame has been
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written by the kernel and which frame has been read by the application.
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.Pp
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The shared structure starts on the first page after your data. The
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structure address can be found by calculation:
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.in +0.5i
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.Pp
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(number_rows * number_columns * pixel_depth + 4095) & 0xfffff000
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.in -0.5i
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.Pp
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or
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.in +0.5i
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.Pp
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((number_rows * number_columns * pixel_depth + 4095)/4096) * 4096
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.in -0.5i
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.Pp
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The shared structure is of type struct meteor_mem. The two most
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important fields are called active and num_active_buf. active
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is a bitmap of frames written by the kernel. num_active_bufs is
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a count of frames marked in the active field. When a frame is read
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in by the driver, the num_active_bufs count is tested, if this
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count is below the threshold of number of active frames (value
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in meteor_mem's hiwat variable), the bit representing frame
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number in the buffer is stored in the active variable, the
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num_active_bufs is incremented, the kernel then raises the specified
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signal to activate the user application. The user application's
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responsibility when getting the signal is to check the active bitmap
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to determine the lowest active frame, use the data as the application
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desires, clear the bitmap entry for that frame, and decrement the
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num_active_bufs. If the threshold of number of active frames (hiwat)
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has been exceeded, no new frames or signal from the kernel will occur
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until the num_active_bufs is less than or equal to lowat.
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.Pp
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The driver loads the frames in a round-robin fashion. it is expected
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that the user removes them in the same order. The driver does not
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check to see if the frame is already active.
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.Pp
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The frame_size and number of frames in the buffer are also provided
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to the meteor_mem structure, but changing these fields in the
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application will not change the operation of the driver.
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.Pp
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In programming for this mode, the user opens the device, sets the
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geometry, mmaps the data/common control structure, then starts the
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continuous capture mode. A special signal catcher is required to
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process the frames as they are read by the kernel.
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.Pp
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When specifying the geometry (See: ioctl METEORSETGEO), it
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is important that the number of frames is set greater than 1.
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.in -0.5i
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.Pp
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skeleton_capture_n.c
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.Pp
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.nf
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/fcntl.h>
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#include <sys/signal.h>
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#include <machine/ioctl_meteor.h>
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int video; /* made global if you wish to stop capture in signal handler */
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caddr_t data_frames;
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struct meteor_mem *common_mem;
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extern int errno;
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#define FRAME_MAX
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void
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usr2_catcher()
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{
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#ifdef SIGNAL_STOP
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struct meteor_capframe capframe; /* for ioctl */
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#endif
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char *frame;
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/* find frame */
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frame = (char *) (data_frames + sig_cnt * common_mem->frame_size) ;
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/* add frame processing here */
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/* deactivate frame */
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common_mem->active &= ~(1 << (sig_cnt % 16));
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common_mem->num_active_bufs--;
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/* process next frame on next interrupt */
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sig_cnt = ((sig_cnt+1) % FRAME_MAX);
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#ifdef SIGNAL_STOP
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if (some_condition_requiring_stopping) {
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capframe.command=METEOR_CAP_STOP_FRAMES;
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if (ioctl(i, METEORCAPFRM, &capframe) < 0) {
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printf("METEORCAPFRM failed %d\n", errno);
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exit(1);
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}
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}
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#endif
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}
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main()
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{
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struct meteor_geomet geo;
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int height, width, depth, frames, size;
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struct meteor_capframe capframe;
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if ((i = open("/dev/meteor0", O_RDONLY)) < 0) {
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printf("open failed\n");
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exit(1);
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}
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printf("test %d %d\n", errno, i);
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height = geo.rows = 120;
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width= geo.columns = 320;
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frames = geo.frames = FRAME_MAX;
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depth = 2; /* 2 bytes per pixel for RGB*/
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geo.oformat = METEOR_GEO_RGB16;
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if (ioctl(i, METEORSETGEO, &geo) < 0) {
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printf("METEORSETGEO failed %d\n", errno);
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exit(1);
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}
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c = METEOR_FMT_NTSC;
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if (ioctl(i, METEORSFMT, &c) < 0) {
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printf("ioctl failed: %d\n", errno);
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exit(1);
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}
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c = METEOR_INPUT_DEV0;
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if (ioctl(i, METEORSINPUT, &c) < 0) {
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printf("ioctl failed: %d\n", errno);
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exit(1);
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}
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size = ((width*height*depth*frames+4095)/4096)*4096;
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/* add one page after data for meteor_mem */
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data_frames = mmap((caddr_t)0, size + 4096, PROT_READ | PROT_WRITE,
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0, i, (off_t)0);
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if (data_frames == (caddr_t) -1) return (0);
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/* common_mem is located at page following data */
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common_mem = (struct meteor_mem *) (y + size);
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signal(SIGUSR2, usr2_catcher); /* catch new frame message */
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capframe.command=METEOR_CAP_N_FRAMES;
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capframe.signal=SIGUSR2;
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capframe.lowat=12; /* must be < hiwat */
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capframe.hiwat=14; /* must be < FRAME_MAX */
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/* start the sync capture */
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if (ioctl(i, METEORCAPFRM, &capframe) < 0) {
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printf("METEORCAPFRM failed %d\n", errno);
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exit(1);
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}
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/* this is the background working area, or you can sleep */
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/* to stop capture */
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capframe.command=METEOR_CAP_STOP_FRAMES;
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if (ioctl(i, METEORCAPFRM, &capframe) < 0) {
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printf("METEORCAPFRM failed %d\n", errno);
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exit(1);
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}
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}
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.if
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.Pp
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.Sh Meteor IOCTL Call and Parameters
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.Pp
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The Meteor capture driver has ioctl requests for capturing, reading card
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status, for setting and reading the geometry, and for setting and reading the
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attributes.
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.Pp
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IT IS VERY IMPORTANT TO CHECK FOR ERRORS ON THESE RETURNING IOCTLs.
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Errors indicate that something is very wrong with the ioctl and the
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application should not attempt to proceed further with capturing. The
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meteor capture driver still makes attempts to stop the next capture step if
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an error occurred in a previous step but was ignored by the application
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programmer.
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.Pp
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1) ioctl requests METEORSETGEO and METEORGETGEO
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.in +0.5i
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METEORSETGEO and METEORGETGEO are used to set and read the input
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size, input device, and output format for frame capture.
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.Pp
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These ioctl routines use the meteor_geomet structure that has the
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following entries:
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.Pp
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.Bl -tag -width columns
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.It Dv rows
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number of rows (lines high) in output image
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.It Dv columns
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number of pixels in a row (width) in output image
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.It Dv frames
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number of frames in buffer. Should be 1, unless using
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the multi-framed synchronous capture mode (METEORCAPFRM)
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which REQUIRES frames to be larger than 1.
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.Pp
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Note: if rows, columns or frames is not changed, then
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the existing values are used. The system defaults
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is 640x480x1.
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.It Dv oformat
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you may choose one of the following output format:
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.Bl -tag -width METEOR_GEO_YUV_PACKED
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.It Dv METEOR_GEO_RGB16
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RGB 16 bits xrrrrrgg gggbbbbb default)
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.It Dv METEOR_GEO_RGB24
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(RBG 24 bits packed in 32 bits:
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00000000 rrrrrrrr gggggggg bbbbbbbb)
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.It Dv METEOR_GEO_YUV_PACKED
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(4-2-2 YUV 16 bits packed. byte format:
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u0 y0 v0 y1 u1 y2 v1 y3 ...)
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.It Dv METEOR_GEO_YUV_PLANER
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(4-2-2 YUV 16 bits planer format:
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rows * columns bytes of y
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rows * column / 4 bytes of even u
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rows * column / 4 bytes of even v
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rows * column / 4 bytes of odd u
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rows * column / 4 bytes of odd v)
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.El
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.El
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.Pp
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The METEORSETGEO ioctl will fail if more than one entry from a category
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is selected. It is highly recommended that a METEORSETGEO is done
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before capturing data because you cannot guarantee the initial mode
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the card.
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.Pp
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The METEORSETGEO will also attempt to reallocate a new contiguous
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kernel buffer if the new geometry exceeds the old geometry. On
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other hand, if the new geometry will fit in the existing buffer,
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the existing buffer is used.
|
|
.Pp
|
|
If METEORSETGEO fails the ioctl() will return a value of -1 and the
|
|
external variable errno will be set to:
|
|
.Pp
|
|
.Bl -tag -width EINVAL
|
|
.It Dv EINVAL
|
|
invalid meteor_geomet structure pointer, rows, columns,
|
|
frames were invalid.
|
|
.It Dv ENOMEM
|
|
could not allocate the contigous block.
|
|
.El
|
|
.in -0.5i
|
|
.Pp
|
|
2) ioctl requests METEORSFMT and METEORGFMT
|
|
.in +0.5i
|
|
.Pp
|
|
METEORSFMT and METEORGFMT are used to set and read the camera input
|
|
standard format.
|
|
.Pp
|
|
Possible formats are:
|
|
.Bl -tag -width METEOR_FMT_AUTOMODE
|
|
.It Dv METEOR_FMT_NTSC
|
|
NTSC (default mode)
|
|
.It Dv METEOR_FMT_PAL
|
|
PAL
|
|
.It Dv METEOR_FMT_SECAM
|
|
SECAM
|
|
.It Dv METEOR_FMT_AUTOMODE
|
|
Autodetect.
|
|
.El
|
|
.in -0.5i
|
|
.Pp
|
|
3) ioctl requests METEORSINPUT and METEORGINPUT
|
|
.in +0.5i
|
|
.Pp
|
|
METEORSINPUT and METEORGINPUT are used to set and read the camera
|
|
input device. Using the DB9 connector on the Meteor card, 4 input
|
|
devices can be connected and an input camera can be selected with this
|
|
ioctl.
|
|
.Pp
|
|
Possible formats are:
|
|
.Bl -tag -width METEOR_INPUT_DEV_SVIDEO
|
|
.It Dv METEOR_INPUT_DEV0
|
|
(default if none specified)
|
|
.It Dv METEOR_INPUT_DEV_RCA
|
|
(same as METEOR_INPUT_DEV0)
|
|
.It Dv METEOR_INPUT_DEV1
|
|
.It Dv METEOR_INPUT_DEV2
|
|
.It Dv METEOR_INPUT_DEV_SVIDEO
|
|
(same as METEOR_INPUT_DEV2)
|
|
.El
|
|
.in -0.5i
|
|
.Pp
|
|
4) ioctl request METEORSTATUS
|
|
.in +0.5i
|
|
.Pp
|
|
METEORSTATUS is used to read the status of the Meteor capture card
|
|
and returns the following information:
|
|
.Pp
|
|
.Bl -tag -width METEOR_STATUS_ID_MASK
|
|
.It Dv METEOR_STATUS_ID_MASK
|
|
4 bit ID of the SAA7196 scaler chip.
|
|
.It Dv METEOR_STATUS_DIR
|
|
0 = scaler uses internal source.
|
|
.br
|
|
1 = scaler uses external data of expansion bus.
|
|
.It Dv METEOR_STATUS_OEF
|
|
0 = even field detected.
|
|
.br
|
|
1 = odd field detected.
|
|
.It Dv METEOR_STATUS_SVP
|
|
VRAM Port state:
|
|
.br
|
|
0 = inputs HFL and INCADDR inactive.
|
|
.br
|
|
1 = inputs HFL and INCADDR active.
|
|
.It Dv METEOR_STATUS_STTC
|
|
0 = TV horizontal time constant (slow).
|
|
.br
|
|
1 = VCR horizontal time constant (fast).
|
|
.It Dv METEOR_STATUS_HCLK
|
|
0 = Horizontal Phase Lock Loop locked.
|
|
.br
|
|
1 = Horizontal Phase Lock Loop unlocked.
|
|
.It Dv METEOR_STATUS_FIDT
|
|
0 = 50 Hz Field detected.
|
|
.br
|
|
1 = 60 Hz Field detected.
|
|
.It Dv METEOR_STATUS_ALTD
|
|
0 = no line alternating color burst detected.
|
|
.br
|
|
1 = line alternating color burst detected
|
|
(PAL/SECAM).
|
|
.It Dv METEOR_STATUS_CODE
|
|
0 = no color information detected.
|
|
.br
|
|
1 = color information detected.
|
|
.El
|
|
.in -0.5i
|
|
.Pp
|
|
5) ioctl request METEORCAPTUR
|
|
.in +0.5i
|
|
.Pp
|
|
METEORCAPTUR is used to single frame capture or unsynchronized
|
|
continuous capture.
|
|
.Pp
|
|
The single frame capture ioctl request will return only after a
|
|
frame has been captured and transfered to the frame buffer.
|
|
.Pp
|
|
The unsynchronized continuous capture will return immediately and
|
|
data is directly deposited into the buffer when it is available.
|
|
Since this is unsynchronized, it is possible the data is being
|
|
written by the kernel while being read by the application.
|
|
.Pp
|
|
These ioctl routines use the following settings:
|
|
following entries:
|
|
.Pp
|
|
.Bl -tag -width METEOR_CAP_CONTINOUS
|
|
.It Dv METEOR_CAP_SINGLE
|
|
capture one frame
|
|
.It Dv METEOR_CAP_CONTINOUS
|
|
unsynchronized continuous capture
|
|
.It Dv METEOR_CAP_STOP_CONT
|
|
stop the unsynchronized continuous
|
|
capture
|
|
.El
|
|
.Pp
|
|
If METEORCAPTUR fails the ioctl() will return a value of -1 and the
|
|
external variable errno will be set to:
|
|
.Pp
|
|
.Bl -tag -width EINVAL
|
|
.It Dv EINVAL
|
|
invalid capture command value
|
|
.It Dv ENXIO
|
|
there is not internal buffer to hold the frame.
|
|
this indicates the previous set geometry ioctl failed.
|
|
.It Dv EIO
|
|
card is already capturing.
|
|
.El
|
|
.in -0.5i
|
|
.Pp
|
|
6) ioctl request METEORCAPFRM
|
|
.in +0.5i
|
|
.Pp
|
|
METEORCAPFRM is used for synchronous capture of multiple frames.
|
|
.Pp
|
|
This ioctl routines use the meteor_capture structure that has the
|
|
following entries:
|
|
.Pp
|
|
.Bl -tag -width command
|
|
.It Dv command
|
|
possible values for command are:
|
|
.Bl -tag -width METEOR_CAP_STOP_FRAMES
|
|
.It Dv METEOR_CAP_STOP_FRAMES stop the capture does not use the
|
|
other variable in structure.
|
|
.It Dv METEOR_CAP_N_FRAMES start the capture using the other
|
|
variables in the structure as inputs
|
|
.El
|
|
.It Dv signal
|
|
signal to send to application when a new
|
|
frame has been captured. This signal will
|
|
only be raised if the captured frame is saved.
|
|
.It Dv lowat
|
|
see below
|
|
.It Dv hiwat
|
|
see below
|
|
.El
|
|
.Pp
|
|
When a new frame is completed, the driver checks the current unread
|
|
frame count stored in shared variable (the shared variable are stored
|
|
in the meteor_mem structure) num_active_buf, if the count is larger
|
|
than hiwat, the driver will not store any new frames and will not
|
|
send capture signal to the user application until the num_active_buf
|
|
is lower than lowat.
|
|
.Pp
|
|
If METEORCAPFRM fails the ioctl() will return a value of -1 and the
|
|
external variable errno will be set to:
|
|
.Pp
|
|
.Bl -tag -width EINVAL
|
|
.It Dv EINVAL
|
|
invalid meteor_geomet structure pointer or bad command.
|
|
.It Dv ENXIO
|
|
there is not internal buffer to hold the frame.
|
|
this indicates the previous set geometry ioctl failed.
|
|
.It Dv EIO
|
|
card is already capturing.
|
|
.El
|
|
.in -0.5i
|
|
.Pp
|
|
7) ioctl requests METEORSCHCV and METEORGCHCV
|
|
.in +0.5i
|
|
.Pp
|
|
METEORSCHCV and METEORGCHCV are used to set and get the chrominance
|
|
gain control and effects the UV output amplitude.
|
|
.Pp
|
|
If METEORSCHCV or METEORGCHCV fails the ioctl() will return a value
|
|
of -1 and the external variable errno will be set to:
|
|
.Pp
|
|
.Bl -tag -width EINVAL
|
|
.It Dv EINVAL
|
|
EINVAL
|
|
invalid unsigned char pointer.
|
|
.El
|
|
.in -0.5i
|
|
.Pp
|
|
8) ioctl requests METEORGHUE and METEORSHUE
|
|
.in +0.5i
|
|
.Pp
|
|
METEORGHUE and METEORSHUE are used to get and set the hue. The
|
|
signed character has legal values are from +127 which represent
|
|
+178.6 degrees to -128 which represents -180 degrees.
|
|
.Pp
|
|
If METEORGHUE or METEORSHUE fails the ioctl() will return a value of
|
|
-1 and the external variable errno will be set to:
|
|
.Pp
|
|
.Bl -tag -width EINVAL
|
|
.It Dv EINVAL
|
|
invalid signed char pointer.
|
|
.El
|
|
.in -0.5i
|
|
.Pp
|
|
9) ioctl requests METEORSCOUNT and METEORGCOUNT
|
|
.in +0.5i
|
|
.Pp
|
|
METEORGCOUNT is used to get the count of frame errors, DMA errors and
|
|
count of the number of frames captured that have occurred since
|
|
the device was opened. METEORSCOUNT can be used to reinitialize the
|
|
counters.
|
|
.Pp
|
|
This ioctl routines use the meteor_counts structure that has the
|
|
following entries:
|
|
.Pp
|
|
.Bl -tag -width frame_count
|
|
.It Dv fifo_errors
|
|
number of FIFO errors since device was opened.
|
|
.It Dv dma_errors number of DMA errors since device was opened.
|
|
|
|
.It Dv frame_count number of frames captured since device was opened.
|
|
.El
|
|
.Pp
|
|
If METEORSCOUNT or METEORGCOUNT fails the ioctl() will return a value
|
|
of -1 and the external variable errno will be set to:
|
|
.Bl -tag -width EINVAL
|
|
.It Dv EINVAL
|
|
invalid meteor_counts structure pointer.
|
|
.El
|
|
.in -0.5i
|
|
.Pp
|
|
.Sh Known Bugs:
|
|
.in +0.5i
|
|
.Pp
|
|
1) IIC register is difficult to set. We got around that by adding a long
|
|
wait at each IIC register write.
|
|
.Pp
|
|
2) We had difficulties getting the Meteor capture card to work on systems
|
|
that used NCR chipset SCSI cards. It is possible that the Meteor and NCR SCSI
|
|
could work together using the newer TRITON motherboards.
|
|
.in -0.5i
|
|
.Pp
|
|
.Sh Authors:
|
|
.Pp
|
|
.Bl -tag -width Mark_Tinguely
|
|
.It Dv Jim Lowe
|
|
(james@miller.cs.uwm.edu)
|
|
.It Dv Mark Tinguely
|
|
(tinguely@plains.nodak.edu)
|
|
.El
|