forked from tTh/FloatImg
297 lines
7.2 KiB
C
297 lines
7.2 KiB
C
/* V4L2 video picture grabber
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Origin :V4L2GRAB.C - patched by tTh
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Copyright (C) 2009 Mauro Carvalho Chehab <mchehab@infradead.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/mman.h>
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#include <linux/videodev2.h>
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#include <libv4l2.h>
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#include "../floatimg.h"
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#include "funcs.h"
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/* --------------------------------------------------------------------- */
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/* compilation control */
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#define SAVE_AS_CUMUL 1
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#define SAVE_AS_PNM 0
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#define SAVE_AS_FIMG 0
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/* --------------------------------------------------------------------- */
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#define CLEAR(x) memset(&(x), 0, sizeof(x))
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struct buffer {
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void *start;
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size_t length;
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};
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int verbosity;
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/* --------------------------------------------------------------------- */
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static void xioctl(int fh, int request, void *arg)
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{
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int r;
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do {
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r = v4l2_ioctl(fh, request, arg);
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} while (r == -1 && ((errno == EINTR) || (errno == EAGAIN)));
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if (r == -1) {
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fprintf(stderr, "error %d, %s\n", errno, strerror(errno));
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sleep(1);
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exit(EXIT_FAILURE);
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}
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}
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/* --------------------------------------------------------------------- */
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void help(int v)
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{
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if (verbosity) {
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printf("compiled %s at %s\n", __DATE__, __TIME__);
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}
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puts("options :");
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puts("\t-d /dev/?\tselect video device");
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puts("\t-n NNN\t\thow many frames ?");
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puts("\t-O ./\t\tset Output dir");
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puts("\t-o bla\t\tset output filename");
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puts("\t-p NNN\t\tperiod in seconds");
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puts("\t-v\t\tincrease verbosity");
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exit(0);
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}
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/* --------------------------------------------------------------------- */
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int main(int argc, char **argv)
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{
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struct v4l2_format fmt;
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struct v4l2_buffer buf;
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struct v4l2_requestbuffers req;
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enum v4l2_buf_type type;
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fd_set fds;
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struct timeval tv;
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int r, fd = -1;
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unsigned int i, n_buffers;
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char *dev_name = "/dev/video0";
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FILE *fout;
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struct buffer *buffers;
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int foo, bar;
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double period = 10.0; /* delai entre les captures */
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int nbre_capt = 1; /* nombre de captures */
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int opt;
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double t_final;
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char *dest_dir = "."; /* no trailing slash */
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char *outfile = "out.pnm";
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#if SAVE_AS_CUMUL
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FloatImg grab, cumul;
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#endif
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while ((opt = getopt(argc, argv, "d:hn:o:O:p:v")) != -1) {
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switch(opt) {
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case 'd': dev_name = optarg; break;
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case 'h': help(0); break;
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case 'n': nbre_capt = atoi(optarg); break;
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case 'O': dest_dir = optarg; break;
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case 'o': outfile = optarg; break;
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case 'p': period = 1e6*atof(optarg); break;
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case 'v': verbosity++; break;
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}
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}
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if (verbosity) {
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fprintf(stderr, "running %s pid=%d\n", argv[0], getpid());
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fprintf(stderr, "period is %.3f microseconds\n", period);
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}
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fd = v4l2_open(dev_name, O_RDWR | O_NONBLOCK, 0);
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if (fd < 0) {
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perror(dev_name);
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exit(EXIT_FAILURE);
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}
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CLEAR(fmt);
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fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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fmt.fmt.pix.width = 640;
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fmt.fmt.pix.height = 480;
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fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB24;
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fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
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xioctl(fd, VIDIOC_S_FMT, &fmt);
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if (fmt.fmt.pix.pixelformat != V4L2_PIX_FMT_RGB24) {
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printf("Libv4l didn't accept RGB24 format. Can't proceed.\n");
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exit(EXIT_FAILURE);
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}
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if ((fmt.fmt.pix.width != 640) || (fmt.fmt.pix.height != 480)) {
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printf("Warning: driver is sending image at %dx%d\n",
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fmt.fmt.pix.width, fmt.fmt.pix.height);
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}
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CLEAR(req);
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req.count = 2;
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req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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req.memory = V4L2_MEMORY_MMAP;
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xioctl(fd, VIDIOC_REQBUFS, &req);
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buffers = calloc(req.count, sizeof(*buffers));
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for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {
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CLEAR(buf);
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buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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buf.index = n_buffers;
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xioctl(fd, VIDIOC_QUERYBUF, &buf);
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buffers[n_buffers].length = buf.length;
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buffers[n_buffers].start = v4l2_mmap(NULL, buf.length,
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PROT_READ | PROT_WRITE, MAP_SHARED,
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fd, buf.m.offset);
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if (MAP_FAILED == buffers[n_buffers].start) {
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perror("v4l2_mmap");
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exit(EXIT_FAILURE);
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}
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}
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(void)fimg_timer_set(0);
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for (i = 0; i < n_buffers; ++i) {
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CLEAR(buf);
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buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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buf.index = i;
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xioctl(fd, VIDIOC_QBUF, &buf);
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}
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#if SAVE_AS_CUMUL
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foo = fimg_create(&grab,
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fmt.fmt.pix.width, fmt.fmt.pix.height,
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FIMG_TYPE_RGB);
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foo = fimg_create(&cumul,
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fmt.fmt.pix.width, fmt.fmt.pix.height,
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FIMG_TYPE_RGB);
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fimg_clear(&cumul);
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#endif
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type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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xioctl(fd, VIDIOC_STREAMON, &type);
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if (verbosity) fprintf(stderr,"pid %d grabbing %d picz...\n",
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getpid(), nbre_capt);
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for (i = 0; i < nbre_capt; i++) {
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do {
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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/* Timeout. */
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tv.tv_sec = 2;
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tv.tv_usec = 0;
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r = select(fd + 1, &fds, NULL, NULL, &tv);
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} while ((r == -1 && (errno = EINTR)));
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if (r == -1) {
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perror("select");
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return errno;
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}
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if(verbosity > 1) {
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printf("%6d %9.3f\n", i, fimg_timer_get(0));
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}
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CLEAR(buf);
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buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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xioctl(fd, VIDIOC_DQBUF, &buf);
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#if SAVE_AS_PNM
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/* at this time,we'v got a picture in-memory,
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so we can blast in on storage */
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sprintf(out_name, "%s/%05d.ppm", dest_dir, i);
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if (verbosity > 1) fprintf(stderr, "--> %s\n", out_name);
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fout = fopen(out_name, "w");
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if (!fout) {
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perror("Cannot open image");
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exit(EXIT_FAILURE);
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}
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fprintf(fout, "P6\n%d %d 255\n",
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fmt.fmt.pix.width, fmt.fmt.pix.height);
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fwrite(buffers[buf.index].start, buf.bytesused, 1, fout);
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fclose(fout);
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#endif
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#if SAVE_AS_CUMUL
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/**
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x_rgb2fimg(buffers[buf.index].start,
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fmt.fmt.pix.width, fmt.fmt.pix.height, &grab);
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fimg_add(&grab, &cumul, &cumul);
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**/
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x_add_rgb2fimg(buffers[buf.index].start,
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fmt.fmt.pix.width, fmt.fmt.pix.height, &cumul);
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#endif
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#if SAVE_AS_FIMG
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sprintf(out_name, "%s/%05d.fimg", dest_dir, i);
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if (verbosity > 1) fprintf(stderr, "--> %s\n", out_name);
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foo = x_rgb2file(buffers[buf.index].start,
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fmt.fmt.pix.width, fmt.fmt.pix.height,
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out_name);
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#endif
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if (nbre_capt > 1 && period > 1.0) {
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usleep(period);
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}
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xioctl(fd, VIDIOC_QBUF, &buf);
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}
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t_final = fimg_timer_get(0);
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fprintf(stderr, "pid %d : elapsed time %g s\n", getpid(), t_final);
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fprintf(stderr, "\t%.2f fps\n", (double)nbre_capt / t_final);
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#if SAVE_AS_CUMUL
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// save cumul to file
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foo = fimg_save_as_pnm(&cumul, outfile, 0);
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// free buffers
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fimg_destroy(&grab);
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fimg_destroy(&cumul);
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#endif
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type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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xioctl(fd, VIDIOC_STREAMOFF, &type);
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for (i = 0; i < n_buffers; ++i) {
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v4l2_munmap(buffers[i].start, buffers[i].length);
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}
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v4l2_close(fd);
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return 0;
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}
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