^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) file: media/v4l/capture.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) =========================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) .. code-block:: c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * V4L2 video capture example
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * This program can be used and distributed without restrictions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * This program is provided with the V4L2 API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * see https://linuxtv.org/docs.php for more information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <assert.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <getopt.h> /* getopt_long() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <fcntl.h> /* low-level i/o */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <sys/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <sys/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <sys/ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/videodev2.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define CLEAR(x) memset(&(x), 0, sizeof(x))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) enum io_method {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) IO_METHOD_READ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) IO_METHOD_MMAP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) IO_METHOD_USERPTR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct buffer {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) void *start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) size_t length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static char *dev_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static enum io_method io = IO_METHOD_MMAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int fd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct buffer *buffers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static unsigned int n_buffers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static int out_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static int force_format;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static int frame_count = 70;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static void errno_exit(const char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) fprintf(stderr, "%s error %d, %s\\n", s, errno, strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static int xioctl(int fh, int request, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) r = ioctl(fh, request, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) } while (-1 == r && EINTR == errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static void process_image(const void *p, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (out_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) fwrite(p, size, 1, stdout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) fflush(stderr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) fprintf(stderr, ".");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) fflush(stdout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static int read_frame(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct v4l2_buffer buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) switch (io) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) case IO_METHOD_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (-1 == read(fd, buffers[0].start, buffers[0].length)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) switch (errno) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) case EAGAIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) case EIO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* Could ignore EIO, see spec. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* fall through */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) errno_exit("read");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) process_image(buffers[0].start, buffers[0].length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) case IO_METHOD_MMAP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) CLEAR(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) buf.memory = V4L2_MEMORY_MMAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) switch (errno) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) case EAGAIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) case EIO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /* Could ignore EIO, see spec. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /* fall through */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) errno_exit("VIDIOC_DQBUF");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) assert(buf.index < n_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) process_image(buffers[buf.index].start, buf.bytesused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) errno_exit("VIDIOC_QBUF");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) case IO_METHOD_USERPTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) CLEAR(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) buf.memory = V4L2_MEMORY_USERPTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) switch (errno) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) case EAGAIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) case EIO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /* Could ignore EIO, see spec. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) /* fall through */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) errno_exit("VIDIOC_DQBUF");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) for (i = 0; i < n_buffers; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (buf.m.userptr == (unsigned long)buffers[i].start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) && buf.length == buffers[i].length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) assert(i < n_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) process_image((void *)buf.m.userptr, buf.bytesused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) errno_exit("VIDIOC_QBUF");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static void mainloop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) unsigned int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) count = frame_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) while (count-- > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) fd_set fds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct timeval tv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) FD_ZERO(&fds);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) FD_SET(fd, &fds);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) /* Timeout. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) tv.tv_sec = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) tv.tv_usec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) r = select(fd + 1, &fds, NULL, NULL, &tv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) if (-1 == r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (EINTR == errno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) errno_exit("select");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (0 == r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) fprintf(stderr, "select timeout\\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (read_frame())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /* EAGAIN - continue select loop. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static void stop_capturing(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) enum v4l2_buf_type type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) switch (io) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) case IO_METHOD_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) /* Nothing to do. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) case IO_METHOD_MMAP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) case IO_METHOD_USERPTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (-1 == xioctl(fd, VIDIOC_STREAMOFF, &type))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) errno_exit("VIDIOC_STREAMOFF");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) static void start_capturing(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) enum v4l2_buf_type type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) switch (io) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) case IO_METHOD_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /* Nothing to do. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) case IO_METHOD_MMAP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) for (i = 0; i < n_buffers; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) struct v4l2_buffer buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) CLEAR(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) buf.memory = V4L2_MEMORY_MMAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) buf.index = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) errno_exit("VIDIOC_QBUF");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) if (-1 == xioctl(fd, VIDIOC_STREAMON, &type))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) errno_exit("VIDIOC_STREAMON");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) case IO_METHOD_USERPTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) for (i = 0; i < n_buffers; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) struct v4l2_buffer buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) CLEAR(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) buf.memory = V4L2_MEMORY_USERPTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) buf.index = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) buf.m.userptr = (unsigned long)buffers[i].start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) buf.length = buffers[i].length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) errno_exit("VIDIOC_QBUF");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (-1 == xioctl(fd, VIDIOC_STREAMON, &type))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) errno_exit("VIDIOC_STREAMON");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) static void uninit_device(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) switch (io) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) case IO_METHOD_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) free(buffers[0].start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) case IO_METHOD_MMAP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) for (i = 0; i < n_buffers; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (-1 == munmap(buffers[i].start, buffers[i].length))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) errno_exit("munmap");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) case IO_METHOD_USERPTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) for (i = 0; i < n_buffers; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) free(buffers[i].start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) free(buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) static void init_read(unsigned int buffer_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) buffers = calloc(1, sizeof(*buffers));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) if (!buffers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) fprintf(stderr, "Out of memory\\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) buffers[0].length = buffer_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) buffers[0].start = malloc(buffer_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) if (!buffers[0].start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) fprintf(stderr, "Out of memory\\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) static void init_mmap(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) struct v4l2_requestbuffers req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) CLEAR(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) req.count = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) req.memory = V4L2_MEMORY_MMAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) if (EINVAL == errno) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) fprintf(stderr, "%s does not support "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) "memory mappingn", dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) errno_exit("VIDIOC_REQBUFS");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (req.count < 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) fprintf(stderr, "Insufficient buffer memory on %s\\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) buffers = calloc(req.count, sizeof(*buffers));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (!buffers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) fprintf(stderr, "Out of memory\\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) struct v4l2_buffer buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) CLEAR(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) buf.memory = V4L2_MEMORY_MMAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) buf.index = n_buffers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) if (-1 == xioctl(fd, VIDIOC_QUERYBUF, &buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) errno_exit("VIDIOC_QUERYBUF");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) buffers[n_buffers].length = buf.length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) buffers[n_buffers].start =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) mmap(NULL /* start anywhere */,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) buf.length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) PROT_READ | PROT_WRITE /* required */,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) MAP_SHARED /* recommended */,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) fd, buf.m.offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) if (MAP_FAILED == buffers[n_buffers].start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) errno_exit("mmap");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) static void init_userp(unsigned int buffer_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) struct v4l2_requestbuffers req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) CLEAR(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) req.count = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) req.memory = V4L2_MEMORY_USERPTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (EINVAL == errno) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) fprintf(stderr, "%s does not support "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) "user pointer i/on", dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) errno_exit("VIDIOC_REQBUFS");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) buffers = calloc(4, sizeof(*buffers));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (!buffers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) fprintf(stderr, "Out of memory\\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) for (n_buffers = 0; n_buffers < 4; ++n_buffers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) buffers[n_buffers].length = buffer_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) buffers[n_buffers].start = malloc(buffer_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) if (!buffers[n_buffers].start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) fprintf(stderr, "Out of memory\\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) static void init_device(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) struct v4l2_capability cap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) struct v4l2_cropcap cropcap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) struct v4l2_crop crop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) struct v4l2_format fmt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) unsigned int min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (-1 == xioctl(fd, VIDIOC_QUERYCAP, &cap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) if (EINVAL == errno) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) fprintf(stderr, "%s is no V4L2 device\\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) errno_exit("VIDIOC_QUERYCAP");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) fprintf(stderr, "%s is no video capture device\\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) switch (io) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) case IO_METHOD_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (!(cap.capabilities & V4L2_CAP_READWRITE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) fprintf(stderr, "%s does not support read i/o\\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) case IO_METHOD_MMAP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) case IO_METHOD_USERPTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) fprintf(stderr, "%s does not support streaming i/o\\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) /* Select video input, video standard and tune here. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) CLEAR(cropcap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (0 == xioctl(fd, VIDIOC_CROPCAP, &cropcap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) crop.c = cropcap.defrect; /* reset to default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (-1 == xioctl(fd, VIDIOC_S_CROP, &crop)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) switch (errno) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) case EINVAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /* Cropping not supported. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) /* Errors ignored. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) /* Errors ignored. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) CLEAR(fmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) if (force_format) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) fmt.fmt.pix.width = 640;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) fmt.fmt.pix.height = 480;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) if (-1 == xioctl(fd, VIDIOC_S_FMT, &fmt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) errno_exit("VIDIOC_S_FMT");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) /* Note VIDIOC_S_FMT may change width and height. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) /* Preserve original settings as set by v4l2-ctl for example */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (-1 == xioctl(fd, VIDIOC_G_FMT, &fmt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) errno_exit("VIDIOC_G_FMT");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) /* Buggy driver paranoia. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) min = fmt.fmt.pix.width * 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (fmt.fmt.pix.bytesperline < min)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) fmt.fmt.pix.bytesperline = min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) if (fmt.fmt.pix.sizeimage < min)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) fmt.fmt.pix.sizeimage = min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) switch (io) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) case IO_METHOD_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) init_read(fmt.fmt.pix.sizeimage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) case IO_METHOD_MMAP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) init_mmap();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) case IO_METHOD_USERPTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) init_userp(fmt.fmt.pix.sizeimage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) static void close_device(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) if (-1 == close(fd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) errno_exit("close");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) fd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) static void open_device(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) struct stat st;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) if (-1 == stat(dev_name, &st)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) fprintf(stderr, "Cannot identify '%s': %d, %s\\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) dev_name, errno, strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) if (!S_ISCHR(st.st_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) fprintf(stderr, "%s is no devicen", dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) fd = open(dev_name, O_RDWR /* required */ | O_NONBLOCK, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) if (-1 == fd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) fprintf(stderr, "Cannot open '%s': %d, %s\\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) dev_name, errno, strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) static void usage(FILE *fp, int argc, char **argv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) fprintf(fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) "Usage: %s [options]\\n\\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) "Version 1.3\\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) "Options:\\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) "-d | --device name Video device name [%s]n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) "-h | --help Print this messagen"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) "-m | --mmap Use memory mapped buffers [default]n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) "-r | --read Use read() callsn"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) "-u | --userp Use application allocated buffersn"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) "-o | --output Outputs stream to stdoutn"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) "-f | --format Force format to 640x480 YUYVn"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) "-c | --count Number of frames to grab [%i]n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) argv[0], dev_name, frame_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) static const char short_options[] = "d:hmruofc:";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) static const struct option
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) long_options[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) { "device", required_argument, NULL, 'd' },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) { "help", no_argument, NULL, 'h' },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) { "mmap", no_argument, NULL, 'm' },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) { "read", no_argument, NULL, 'r' },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) { "userp", no_argument, NULL, 'u' },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) { "output", no_argument, NULL, 'o' },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) { "format", no_argument, NULL, 'f' },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) { "count", required_argument, NULL, 'c' },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) { 0, 0, 0, 0 }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) int main(int argc, char **argv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) dev_name = "/dev/video0";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) int c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) c = getopt_long(argc, argv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) short_options, long_options, &idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) if (-1 == c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) switch (c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) case 0: /* getopt_long() flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) case 'd':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) dev_name = optarg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) case 'h':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) usage(stdout, argc, argv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) exit(EXIT_SUCCESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) case 'm':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) io = IO_METHOD_MMAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) case 'r':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) io = IO_METHOD_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) case 'u':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) io = IO_METHOD_USERPTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) case 'o':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) out_buf++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) case 'f':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) force_format++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) case 'c':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) errno = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) frame_count = strtol(optarg, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) if (errno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) errno_exit(optarg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) usage(stderr, argc, argv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) open_device();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) init_device();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) start_capturing();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) mainloop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) stop_capturing();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) uninit_device();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) close_device();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) fprintf(stderr, "\\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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