[jondecker76 Participant]

I’d love to have this feature too

I was going to wrap Linux v4l2 API but just haven’t had the chance.  Native cross platform support would be great though, especially on mobile devices!

[jondecker76 Participant]

Why not allow either?

[jondecker76 Participant]

As long as documentation is good. I don’t see where the confusion would be.  I know of no other paint or color program that deals with rgb data as floats, so to me this is a different kind of inconsistency. Quite actually I’d also like an overload for htmlcolor strings as well

Nevertheless. For my own needs I’ll just extend Color and add my own overloads- was just adding my opinion

[jondecker76 Participant]

I would like to see the New method overloaded for a more common convention of using 0-255 Ints while creating colors.  Of course, floats would still be used internally, but for convenience I think this would be nice

Monkey

Method New( r:Int,g:Int,b:Int,a:Float=1 )

1 2	Method New( r:Int,g:Int,b:Int,a:Float=1 )

[jondecker76 Participant]

Mark covered implementing Generators using Fibers and gives a few examples in his Feb 1st “Fun with fibers” blog post on the main page.  It has all the info you need to make your own generators

[jondecker76 Participant]

It’s pretty easy

Install git

From the command line in the directory you want to clone monkey 2 to, run:

git clone https://github.com/blitz-research/monkey2.git

That’ll install the current build.  Then anytime you want to pull in New changes just run

git pull

And files will be updated.  Rebuildall and you’re set

[jondecker76 Participant]

I do pretty much what Mark suggested – just build them as extra source files during development until I feel they are done, then I’ll make them into a module if I feel it’s something I might use again.

I’m not a huge fan of the modules system yet in Monkey2 yet though.  I think the ability to organize in subfolders is  a must, as my modules folder is already a jumbled mess.  I really liked how it was implemented in BlitzMax.  All of BRL’s stuff was in brl.mod, and each subfolder could be another module.  Under BMX, I had my own jmd.mod, with several individual modules that I could import one at a time if needed.

[jondecker76 Participant]

I’m still looking forward to seeing this as well

[jondecker76 Participant]

I have a couple modules I would upload, add me in

[jondecker76 Participant]

Good point – I actually didn’t know that that the Color class worked in 0.0 to 1.0 for the R G B aspects, the documentation wasn’t clear.  But looking at color.monkey2 I can see you’re right.  Either way,  there seems to be a problem converting from pixmap colorspace to Image colorspace somewhere in the mojo code

[jondecker76 Participant]

I’m looking forward to trying this when I get a chance.  I hope Mark decides to merge in changes – there are a ton of great ARM boards available and there will be no shortage of them in the future either

[jondecker76 Participant]

Thanks guys, I knew it was going to be something that makes a lot of sense once I heard it!

[jondecker76 Participant]

Here’s the contents of v4l2.c if it helps at all…

Monkey

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <assert.h> #include <getopt.h> // getopt_long() #include <fcntl.h> // low-level i/o #include <unistd.h> #include <errno.h> #include <malloc.h> #include <sys/stat.h> #include <sys/types.h> #include <sys/time.h> #include <sys/mman.h> #include <sys/ioctl.h> #include <asm/types.h> // for videodev2.h #include <linux/videodev2.h> // the meat and potatoes #define CLEAR(x) memset (&(x), 0, sizeof (x))</p> <p>//GLOBALS TO IMPORT INTO BLITZ MAX (with sensible defaults) char *dev_name = "/dev/video0";//NULL; int dev_width = 640; int dev_height = 480; //END GLOBALS int pix_pitch = 3; //3 bytes - R, G and B</p> <p>typedef enum { IO_METHOD_READ, IO_METHOD_MMAP, IO_METHOD_USERPTR,r } io_method;</p> <p>struct buffer { void * start; size_t length; }; struct buffer *buffers = NULL;</p> <p>io_method io = IO_METHOD_MMAP; int fd = -1; unsigned int n_buffers = 0;</p> <p>void errno_exit(const char *s) { fprintf (stderr, "%s error %d, %sn",s, errno, strerror (errno)); exit (EXIT_FAILURE); }</p> <p>int xioctl(int fd,int request,void *arg) { int r;</p> <p> do r = ioctl (fd, request, arg); while (-1 == r && EINTR == errno);</p> <p> return r; }</p> <p>int read_frame(void) { struct v4l2_buffer buf; unsigned int i;</p> <p> switch (io) { case IO_METHOD_READ: if (-1 == read (fd, buffers[0].start, buffers[0].length)) { switch (errno) { case EAGAIN: return 0;</p> <p> case EIO: /* Could ignore EIO, see spec. */</p> <p> /* fall through */</p> <p> default: errno_exit ("read"); } }</p> <p> break;</p> <p> case IO_METHOD_MMAP: CLEAR (buf);</p> <p> buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP;</p> <p> if (-1 == xioctl (fd, VIDIOC_DQBUF, &buf)) { switch (errno) { case EAGAIN: return 0;</p> <p> case EIO: /* Could ignore EIO, see spec. */</p> <p> /* fall through */</p> <p> default: errno_exit ("VIDIOC_DQBUF"); } }</p> <p> assert (buf.index < n_buffers);</p> <p> if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF");</p> <p> break;</p> <p> case IO_METHOD_USERPTR: CLEAR (buf);</p> <p> buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_USERPTR;</p> <p> if (-1 == xioctl (fd, VIDIOC_DQBUF, &buf)) { switch (errno) { case EAGAIN: return 0;</p> <p> case EIO: /* Could ignore EIO, see spec. */</p> <p> /* fall through */</p> <p> default: errno_exit ("VIDIOC_DQBUF"); } }</p> <p> for (i = 0; i < n_buffers; ++i) if (buf.m.userptr == (unsigned long) buffers[i].start && buf.length == buffers[i].length) break;</p> <p> assert (i < n_buffers);</p> <p> if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF");</p> <p> break; }</p> <p> return 1; }</p> <p>unsigned char *grab_one() { unsigned char *buf_rgb24[dev_width*dev_height]; for (;;) { fd_set fds; struct timeval tv; int r;</p> <p> FD_ZERO (&fds); FD_SET (fd, &fds);</p> <p> // Timeout. tv.tv_sec = 2; tv.tv_usec = 0;</p> <p> r = select (fd + 1, &fds, NULL, NULL, &tv);</p> <p> if (-1 == r) { if (EINTR == errno) continue;</p> <p> errno_exit ("select"); }</p> <p> if (0 == r) { fprintf (stderr, "select timeoutn"); exit (EXIT_FAILURE); }</p> <p> if (read_frame ()) { //yuyv2rgb(buffers[0].start,dev_width, dev_height); yuyv_to_rgb24 (dev_width, dev_height, buffers[0].start, buf_rgb24); return buf_rgb24;//buffers[0].start; } } }</p> <p>void stop_capturing(void) { enum v4l2_buf_type type;</p> <p> switch (io) { case IO_METHOD_READ: /* Nothing to do. */ break;</p> <p> case IO_METHOD_MMAP: case IO_METHOD_USERPTR: type = V4L2_BUF_TYPE_VIDEO_CAPTURE;</p> <p> if (-1 == xioctl (fd, VIDIOC_STREAMOFF, &type)) errno_exit ("VIDIOC_STREAMOFF");</p> <p> break; } }</p> <p>void start_capturing(void) { unsigned int i; enum v4l2_buf_type type;</p> <p> switch (io) { case IO_METHOD_READ: /* Nothing to do. */ break;</p> <p> case IO_METHOD_MMAP: for (i = 0; i < n_buffers; ++i) { struct v4l2_buffer buf;</p> <p> CLEAR (buf);</p> <p> buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; buf.index = i;</p> <p> if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF"); }</p> <p> type = V4L2_BUF_TYPE_VIDEO_CAPTURE;</p> <p> if (-1 == xioctl (fd, VIDIOC_STREAMON, &type)) errno_exit ("VIDIOC_STREAMON");</p> <p> break;</p> <p> case IO_METHOD_USERPTR: for (i = 0; i < n_buffers; ++i) { struct v4l2_buffer buf;</p> <p> CLEAR (buf);</p> <p> buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_USERPTR; buf.index = i; buf.m.userptr = (unsigned long) buffers[i].start; buf.length = buffers[i].length;</p> <p> if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF"); }</p> <p> type = V4L2_BUF_TYPE_VIDEO_CAPTURE;</p> <p> if (-1 == xioctl (fd, VIDIOC_STREAMON, &type)) errno_exit ("VIDIOC_STREAMON");</p> <p> break; } }</p> <p>void uninit_device(void) { unsigned int i;</p> <p> switch (io) { case IO_METHOD_READ: free (buffers[0].start); break;</p> <p> case IO_METHOD_MMAP: for (i = 0; i < n_buffers; ++i) if (-1 == munmap (buffers[i].start, buffers[i].length)) errno_exit ("munmap"); break;</p> <p> case IO_METHOD_USERPTR: for (i = 0; i < n_buffers; ++i) free (buffers[i].start); break; }</p> <p> free (buffers); }</p> <p>void init_read(unsigned int buffer_size) { buffers = calloc (1, sizeof (*buffers));</p> <p> if (!buffers) { fprintf (stderr, "Out of memoryn"); exit (EXIT_FAILURE); }</p> <p> buffers[0].length = buffer_size; buffers[0].start = malloc (buffer_size);</p> <p> if (!buffers[0].start) { fprintf (stderr, "Out of memoryn"); exit (EXIT_FAILURE); } }</p> <p>void init_mmap(void) { struct v4l2_requestbuffers req;</p> <p> CLEAR (req);</p> <p> req.count = 4; req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; req.memory = V4L2_MEMORY_MMAP;</p> <p> if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) { if (EINVAL == errno) { fprintf (stderr, "%s does not support " "memory mappingn", dev_name); exit (EXIT_FAILURE); } else { errno_exit ("VIDIOC_REQBUFS"); } }</p> <p> if (req.count < 2) { fprintf (stderr, "Insufficient buffer memory on %sn", dev_name); exit (EXIT_FAILURE); }</p> <p> buffers = calloc (req.count, sizeof (*buffers));</p> <p> if (!buffers) { fprintf (stderr, "Out of memoryn"); exit (EXIT_FAILURE); }</p> <p> for (n_buffers = 0; n_buffers < req.count; ++n_buffers) { struct v4l2_buffer buf;</p> <p> CLEAR (buf);</p> <p> buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; buf.index = n_buffers;</p> <p> if (-1 == xioctl (fd, VIDIOC_QUERYBUF, &buf)) errno_exit ("VIDIOC_QUERYBUF");</p> <p> buffers[n_buffers].length = buf.length; buffers[n_buffers].start = mmap (NULL /* start anywhere */, buf.length, PROT_READ | PROT_WRITE /* required */, MAP_SHARED /* recommended */, fd, buf.m.offset);</p> <p> if (MAP_FAILED == buffers[n_buffers].start) errno_exit ("mmap"); } }</p> <p>void init_userp(unsigned int buffer_size) { struct v4l2_requestbuffers req; unsigned int page_size;</p> <p> page_size = getpagesize (); buffer_size = (buffer_size + page_size - 1) & ~(page_size - 1);</p> <p> CLEAR (req);</p> <p> req.count = 4; req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; req.memory = V4L2_MEMORY_USERPTR;</p> <p> if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) { if (EINVAL == errno) { fprintf (stderr, "%s does not support " "user pointer i/on", dev_name); exit (EXIT_FAILURE); } else { errno_exit ("VIDIOC_REQBUFS"); } }</p> <p> buffers = calloc (4, sizeof (*buffers));</p> <p> if (!buffers) { fprintf (stderr, "Out of memoryn"); exit (EXIT_FAILURE); }</p> <p> for (n_buffers = 0; n_buffers < 4; ++n_buffers) { buffers[n_buffers].length = buffer_size; buffers[n_buffers].start = memalign (/* boundary */ page_size, buffer_size);</p> <p> if (!buffers[n_buffers].start) { fprintf (stderr, "Out of memoryn"); exit (EXIT_FAILURE); } } }</p> <p>void init_device(void) { struct v4l2_capability cap; struct v4l2_cropcap cropcap; struct v4l2_crop crop; struct v4l2_format fmt; struct v4l2_input input; v4l2_std_id std_id;</p> <p> unsigned int min;</p> <p> if (-1 == xioctl (fd, VIDIOC_QUERYCAP, &cap)) { if (EINVAL == errno) { fprintf (stderr, "%s is no V4L2 devicen", dev_name); exit (EXIT_FAILURE); } else { errno_exit ("VIDIOC_QUERYCAP"); } }</p> <p> if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) { fprintf (stderr, "%s is no video capture devicen", dev_name); exit (EXIT_FAILURE); }</p> <p> switch (io) { case IO_METHOD_READ: if (!(cap.capabilities & V4L2_CAP_READWRITE)) { fprintf (stderr, "%s does not support read i/on", dev_name); exit (EXIT_FAILURE); }</p> <p> break;</p> <p> case IO_METHOD_MMAP: case IO_METHOD_USERPTR: if (!(cap.capabilities & V4L2_CAP_STREAMING)) { fprintf (stderr, "%s does not support streaming i/on", dev_name); exit (EXIT_FAILURE); }</p> <p> break; }</p> <p> /* Select video input, video standard and tune here. memset (&input, 0, sizeof (input));</p> <p>if (-1 == ioctl (fd, VIDIOC_G_INPUT, &input.index)) { perror ("VIDIOC_G_INPUT"); exit (EXIT_FAILURE); }</p> <p>if (-1 == ioctl (fd, VIDIOC_ENUMINPUT, &input)) { perror ("VIDIOC_ENUM_INPUT"); exit (EXIT_FAILURE); }</p> <p>if (0 == (input.std & V4L2_PAL_BG)) { fprintf (stderr, "Oops. B/G PAL is not supported.n"); exit (EXIT_FAILURE); } */</p> <p> CLEAR (cropcap);</p> <p> cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;</p> <p> if (0 == xioctl (fd, VIDIOC_CROPCAP, &cropcap)) { crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; crop.c = cropcap.defrect; /* reset to default */</p> <p> if (-1 == xioctl (fd, VIDIOC_S_CROP, &crop)) { switch (errno) { case EINVAL: /* Cropping not supported. */ break; default: /* Errors ignored. */ break; } } } else { /* Errors ignored. */ }</p> <p> CLEAR (fmt);</p> <p> fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; fmt.fmt.pix.width = dev_width; fmt.fmt.pix.height = dev_height; fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV; fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;</p> <p> if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt)) errno_exit ("VIDIOC_S_FMT");</p> <p> /* Note VIDIOC_S_FMT may change width and height. */</p> <p> /* Buggy driver paranoia. */ min = fmt.fmt.pix.width * 2; if (fmt.fmt.pix.bytesperline < min) fmt.fmt.pix.bytesperline = min; min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height; if (fmt.fmt.pix.sizeimage < min) fmt.fmt.pix.sizeimage = min;</p> <p> switch (io) { case IO_METHOD_READ: init_read (fmt.fmt.pix.sizeimage); break;</p> <p> case IO_METHOD_MMAP: init_mmap (); break;</p> <p> case IO_METHOD_USERPTR: init_userp (fmt.fmt.pix.sizeimage); break; } }</p> <p>void close_device(void) { if (-1 == close (fd)) errno_exit ("close");</p> <p> fd = -1; }</p> <p>void open_device(void) { struct stat st; </p> <p> if (-1 == stat (dev_name, &st)) { fprintf (stderr, "Cannot identify '%s': %d, %sn", dev_name, errno, strerror (errno)); exit (EXIT_FAILURE); }</p> <p> if (!S_ISCHR (st.st_mode)) { fprintf (stderr, "%s is no devicen", dev_name); exit (EXIT_FAILURE); }</p> <p> fd = open (dev_name, O_RDWR /* required */ | O_NONBLOCK, 0);</p> <p> if (-1 == fd) { fprintf (stderr, "Cannot open '%s': %d, %sn", dev_name, errno, strerror (errno)); exit (EXIT_FAILURE); } }</p> <p>//Convert from YUV 4:2:2 to RGB24 format! void yuyv_to_rgb24 (int width, int height, unsigned int *src, unsigned char *dst) { unsigned char *s; unsigned char *d; int l, c; int r, g, b, cr, cg, cb, y1, y2;</p> <p> l = height; s = src; d = dst; while (l--) { c = width >> 1; while (c--) {</p> <p> y1 = *s++; cb = ((*s - 128) * 454) >> 8; cg = (*s++ - 128) * 88; y2 = *s++; cr = ((*s - 128) * 359) >> 8; cg = (cg + (*s++ - 128) * 183) >> 8;</p> <p> r = y1 + cr; b = y1 + cb; g = y1 - cg; r=limit(r,0,255); g=limit(g,0,255); b=limit(b,0,255);</p> <p> *d++ = r; *d++ = g; *d++ = b;</p> <p> r = y2 + cr; b = y2 + cb; g = y2 - cg; r=limit(r,0,255); g=limit(g,0,255); b=limit(b,0,255);</p> <p> *d++ = r; *d++ = g; *d++ = b; } } }</p> <p>int limit(int val, int min, int max) { if(val<min) return min; if(val>max) return max; return val; }

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#include <stdio.h> #include <stdlib.h> #include <string.h> #include <assert.h> #include <getopt.h>             // getopt_long() #include <fcntl.h>              // low-level i/o #include <unistd.h> #include <errno.h> #include <malloc.h> #include <sys/stat.h> #include <sys/types.h> #include <sys/time.h> #include <sys/mman.h> #include <sys/ioctl.h> #include <asm/types.h>          // for videodev2.h #include <linux/videodev2.h> // the meat and potatoes #define CLEAR(x) memset (&(x), 0, sizeof (x))     //GLOBALS TO IMPORT INTO BLITZ MAX (with sensible defaults) char *dev_name   = "/dev/video0";//NULL; int dev_width    = 640; int dev_height   = 480; //END GLOBALS int pix_pitch    = 3; //3 bytes - R, G and B   typedef enum { IO_METHOD_READ, IO_METHOD_MMAP, IO_METHOD_USERPTR,r } io_method;   struct buffer {         void *                  start;         size_t                  length; }; struct buffer *buffers = NULL;     io_method io = IO_METHOD_MMAP; int fd = -1; unsigned int n_buffers = 0;   void errno_exit(const char *s) {         fprintf (stderr, "%s error %d, %sn",s, errno, strerror (errno));         exit (EXIT_FAILURE); }   int xioctl(int fd,int request,void *arg) {         int r;           do r = ioctl (fd, request, arg);         while (-1 == r && EINTR == errno);           return r; }   int read_frame(void) {         struct v4l2_buffer buf; unsigned int i;   switch (io) { case IO_METHOD_READ:      if (-1 == read (fd, buffers[0].start, buffers[0].length)) {              switch (errno) {              case EAGAIN:                      return 0;   case EIO: /* Could ignore EIO, see spec. */   /* fall through */   default: errno_exit ("read"); } }   break;   case IO_METHOD_MMAP: CLEAR (buf);                buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;              buf.memory = V4L2_MEMORY_MMAP;        if (-1 == xioctl (fd, VIDIOC_DQBUF, &buf)) {              switch (errno) {              case EAGAIN:                      return 0;   case EIO: /* Could ignore EIO, see spec. */   /* fall through */   default: errno_exit ("VIDIOC_DQBUF"); } }                   assert (buf.index < n_buffers);   if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF");   break;   case IO_METHOD_USERPTR: CLEAR (buf);        buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;      buf.memory = V4L2_MEMORY_USERPTR;   if (-1 == xioctl (fd, VIDIOC_DQBUF, &buf)) { switch (errno) { case EAGAIN: return 0;   case EIO: /* Could ignore EIO, see spec. */   /* fall through */   default: errno_exit ("VIDIOC_DQBUF"); } }   for (i = 0; i < n_buffers; ++i) if (buf.m.userptr == (unsigned long) buffers[i].start     && buf.length == buffers[i].length) break;   assert (i < n_buffers);   if (-1 == xioctl (fd, VIDIOC_QBUF, &buf)) errno_exit ("VIDIOC_QBUF");   break; }   return 1; }   unsigned char *grab_one() { unsigned char *buf_rgb24[dev_width*dev_height]; for (;;) { fd_set fds; struct timeval tv; int r;   FD_ZERO (&fds); FD_SET (fd, &fds);   // Timeout. tv.tv_sec = 2; tv.tv_usec = 0;   r = select (fd + 1, &fds, NULL, NULL, &tv);   if (-1 == r) { if (EINTR == errno) continue;   errno_exit ("select"); }   if (0 == r) { fprintf (stderr, "select timeoutn"); exit (EXIT_FAILURE); }   if (read_frame ()) { //yuyv2rgb(buffers[0].start,dev_width, dev_height); yuyv_to_rgb24 (dev_width, dev_height, buffers[0].start, buf_rgb24); return buf_rgb24;//buffers[0].start; } } }     void stop_capturing(void) {         enum v4l2_buf_type type;   switch (io) { case IO_METHOD_READ: /* Nothing to do. */ break;   case IO_METHOD_MMAP: case IO_METHOD_USERPTR: type = V4L2_BUF_TYPE_VIDEO_CAPTURE;   if (-1 == xioctl (fd, VIDIOC_STREAMOFF, &type)) errno_exit ("VIDIOC_STREAMOFF");   break; } }   void start_capturing(void) {         unsigned int i;         enum v4l2_buf_type type;   switch (io) { case IO_METHOD_READ: /* Nothing to do. */ break;   case IO_METHOD_MMAP: for (i = 0; i < n_buffers; ++i) {              struct v4l2_buffer buf;            CLEAR (buf);            buf.type        = V4L2_BUF_TYPE_VIDEO_CAPTURE;          buf.memory      = V4L2_MEMORY_MMAP;          buf.index       = i;            if (-1 == xioctl (fd, VIDIOC_QBUF, &buf))                      errno_exit ("VIDIOC_QBUF"); } type = V4L2_BUF_TYPE_VIDEO_CAPTURE;   if (-1 == xioctl (fd, VIDIOC_STREAMON, &type)) errno_exit ("VIDIOC_STREAMON");   break;   case IO_METHOD_USERPTR: for (i = 0; i < n_buffers; ++i) {              struct v4l2_buffer buf;            CLEAR (buf);            buf.type        = V4L2_BUF_TYPE_VIDEO_CAPTURE;          buf.memory      = V4L2_MEMORY_USERPTR; buf.index       = i; buf.m.userptr = (unsigned long) buffers[i].start; buf.length      = buffers[i].length; if (-1 == xioctl (fd, VIDIOC_QBUF, &buf))                      errno_exit ("VIDIOC_QBUF"); }   type = V4L2_BUF_TYPE_VIDEO_CAPTURE;   if (-1 == xioctl (fd, VIDIOC_STREAMON, &type)) errno_exit ("VIDIOC_STREAMON");   break; } }   void uninit_device(void) {         unsigned int i;   switch (io) { case IO_METHOD_READ: free (buffers[0].start); break;   case IO_METHOD_MMAP: for (i = 0; i < n_buffers; ++i) if (-1 == munmap (buffers[i].start, buffers[i].length)) errno_exit ("munmap"); break;   case IO_METHOD_USERPTR: for (i = 0; i < n_buffers; ++i) free (buffers[i].start); break; }   free (buffers); }   void init_read(unsigned int buffer_size) {         buffers = calloc (1, sizeof (*buffers));           if (!buffers) {                 fprintf (stderr, "Out of memoryn");                 exit (EXIT_FAILURE);         }   buffers[0].length = buffer_size; buffers[0].start = malloc (buffer_size);   if (!buffers[0].start) {      fprintf (stderr, "Out of memoryn");              exit (EXIT_FAILURE); } }   void init_mmap(void) { struct v4l2_requestbuffers req;           CLEAR (req);           req.count               = 4;         req.type                = V4L2_BUF_TYPE_VIDEO_CAPTURE;         req.memory              = V4L2_MEMORY_MMAP;   if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) {                 if (EINVAL == errno) {                         fprintf (stderr, "%s does not support "                                  "memory mappingn", dev_name);                         exit (EXIT_FAILURE);                 } else {                         errno_exit ("VIDIOC_REQBUFS");                 }         }           if (req.count < 2) {                 fprintf (stderr, "Insufficient buffer memory on %sn",                          dev_name);                 exit (EXIT_FAILURE);         }           buffers = calloc (req.count, sizeof (*buffers));           if (!buffers) {                 fprintf (stderr, "Out of memoryn");                 exit (EXIT_FAILURE);         }           for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {                 struct v4l2_buffer buf;                   CLEAR (buf);                   buf.type        = V4L2_BUF_TYPE_VIDEO_CAPTURE;                 buf.memory      = V4L2_MEMORY_MMAP;                 buf.index       = n_buffers;                   if (-1 == xioctl (fd, VIDIOC_QUERYBUF, &buf))                         errno_exit ("VIDIOC_QUERYBUF");                   buffers[n_buffers].length = buf.length;                 buffers[n_buffers].start =                         mmap (NULL /* start anywhere */,                               buf.length,                               PROT_READ | PROT_WRITE /* required */,                               MAP_SHARED /* recommended */,                               fd, buf.m.offset);                   if (MAP_FAILED == buffers[n_buffers].start)                         errno_exit ("mmap");         } }   void init_userp(unsigned int buffer_size) { struct v4l2_requestbuffers req;         unsigned int page_size;           page_size = getpagesize ();         buffer_size = (buffer_size + page_size - 1) & ~(page_size - 1);           CLEAR (req);           req.count               = 4;         req.type                = V4L2_BUF_TYPE_VIDEO_CAPTURE;         req.memory              = V4L2_MEMORY_USERPTR;           if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) {                 if (EINVAL == errno) {                         fprintf (stderr, "%s does not support "                                  "user pointer i/on", dev_name);                         exit (EXIT_FAILURE);                 } else {                         errno_exit ("VIDIOC_REQBUFS");                 }         }           buffers = calloc (4, sizeof (*buffers));           if (!buffers) {                 fprintf (stderr, "Out of memoryn");                 exit (EXIT_FAILURE);         }           for (n_buffers = 0; n_buffers < 4; ++n_buffers) {                 buffers[n_buffers].length = buffer_size;                 buffers[n_buffers].start = memalign (/* boundary */ page_size,                                                      buffer_size);                   if (!buffers[n_buffers].start) {      fprintf (stderr, "Out of memoryn");              exit (EXIT_FAILURE); }         } }   void init_device(void) {         struct v4l2_capability cap;         struct v4l2_cropcap cropcap;         struct v4l2_crop crop;         struct v4l2_format fmt; struct v4l2_input input; v4l2_std_id std_id;     unsigned int min;           if (-1 == xioctl (fd, VIDIOC_QUERYCAP, &cap)) {                 if (EINVAL == errno) {                         fprintf (stderr, "%s is no V4L2 devicen",                                  dev_name);                         exit (EXIT_FAILURE);                 } else {                         errno_exit ("VIDIOC_QUERYCAP");                 }         }           if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {                 fprintf (stderr, "%s is no video capture devicen",                          dev_name);                 exit (EXIT_FAILURE);         }   switch (io) { case IO_METHOD_READ: if (!(cap.capabilities & V4L2_CAP_READWRITE)) { fprintf (stderr, "%s does not support read i/on", dev_name); exit (EXIT_FAILURE); }   break;   case IO_METHOD_MMAP: case IO_METHOD_USERPTR: if (!(cap.capabilities & V4L2_CAP_STREAMING)) { fprintf (stderr, "%s does not support streaming i/on", dev_name); exit (EXIT_FAILURE); }   break; }             /* Select video input, video standard and tune here. memset (&input, 0, sizeof (input));   if (-1 == ioctl (fd, VIDIOC_G_INPUT, &input.index)) {         perror ("VIDIOC_G_INPUT");         exit (EXIT_FAILURE); }   if (-1 == ioctl (fd, VIDIOC_ENUMINPUT, &input)) {         perror ("VIDIOC_ENUM_INPUT");         exit (EXIT_FAILURE); }   if (0 == (input.std & V4L2_PAL_BG)) {         fprintf (stderr, "Oops. B/G PAL is not supported.n");         exit (EXIT_FAILURE); } */   CLEAR (cropcap);           cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;           if (0 == xioctl (fd, VIDIOC_CROPCAP, &cropcap)) {                 crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;                 crop.c = cropcap.defrect; /* reset to default */                   if (-1 == xioctl (fd, VIDIOC_S_CROP, &crop)) {                         switch (errno) {                         case EINVAL:                                 /* Cropping not supported. */                                 break;                         default:                                 /* Errors ignored. */                                 break;                         }                 }         } else {                 /* Errors ignored. */         }             CLEAR (fmt);           fmt.type                = V4L2_BUF_TYPE_VIDEO_CAPTURE;         fmt.fmt.pix.width       = dev_width;         fmt.fmt.pix.height      = dev_height;         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;         fmt.fmt.pix.field       = V4L2_FIELD_INTERLACED;           if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt))                 errno_exit ("VIDIOC_S_FMT");           /* Note VIDIOC_S_FMT may change width and height. */   /* Buggy driver paranoia. */ min = fmt.fmt.pix.width * 2; if (fmt.fmt.pix.bytesperline < min) fmt.fmt.pix.bytesperline = min; min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height; if (fmt.fmt.pix.sizeimage < min) fmt.fmt.pix.sizeimage = min;   switch (io) { case IO_METHOD_READ: init_read (fmt.fmt.pix.sizeimage); break;   case IO_METHOD_MMAP: init_mmap (); break;   case IO_METHOD_USERPTR: init_userp (fmt.fmt.pix.sizeimage); break; } }   void close_device(void) {         if (-1 == close (fd))         errno_exit ("close");           fd = -1; }   void open_device(void) {         struct stat st;           if (-1 == stat (dev_name, &st)) {                 fprintf (stderr, "Cannot identify '%s': %d, %sn",                          dev_name, errno, strerror (errno));                 exit (EXIT_FAILURE);         }           if (!S_ISCHR (st.st_mode)) {                 fprintf (stderr, "%s is no devicen", dev_name);                 exit (EXIT_FAILURE);         }           fd = open (dev_name, O_RDWR /* required */ | O_NONBLOCK, 0);           if (-1 == fd) {                 fprintf (stderr, "Cannot open '%s': %d, %sn",                          dev_name, errno, strerror (errno));                 exit (EXIT_FAILURE);         } }   //Convert from YUV 4:2:2 to RGB24 format! void yuyv_to_rgb24 (int width, int height, unsigned int *src, unsigned char *dst) {    unsigned char *s;    unsigned char *d;    int l, c;    int r, g, b, cr, cg, cb, y1, y2;       l = height;    s = src;    d = dst;    while (l--) {       c = width >> 1;       while (c--) {          y1 = *s++;          cb = ((*s - 128) * 454) >> 8;          cg = (*s++ - 128) * 88;          y2 = *s++;          cr = ((*s - 128) * 359) >> 8;          cg = (cg + (*s++ - 128) * 183) >> 8;            r = y1 + cr;          b = y1 + cb;          g = y1 - cg;          r=limit(r,0,255);          g=limit(g,0,255);          b=limit(b,0,255);     *d++ = r; *d++ = g; *d++ = b;            r = y2 + cr;          b = y2 + cb;          g = y2 - cg;          r=limit(r,0,255);          g=limit(g,0,255);          b=limit(b,0,255);   *d++ = r; *d++ = g; *d++ = b;       }    } }   int limit(int val, int min, int max) { if(val<min) return min; if(val>max) return max; return val; }

I’ve played with this all day and still the defined Externs refuse to be recognized

[jondecker76 Participant]

I jumped on the Patreon funding wagon – same username

Looking forward to seeing Monkey2 grow

[jondecker76 Participant]

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