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August 4, 2011 22:02
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,27 @@ Driver Caps: Driver: "omap3" Card: "omap3/mt9v032//" Bus: "" Version: 0.0 Capabilities: 04000001 Camera Cropping: Bounds: 752x480+0+0 Default: 752x480+0+0 Aspect: 1/1 FMT : CE Desc -------------------- UYVY: UYVY, packed YUYV: YUYV (YUV 4:2:2), packed BA10: Bayer10 (GrR/BGb) Selected Camera Mode: Width: 752 Height: 480 PixFmt: BA10 Field: 1 Length: 724992 Address: 0x40156000 Image Length: 0 omap-iommu omap-iommu.0: omap2_iommu_fault_isr: da:000c0000 translation fault omap-iommu omap-iommu.0: iommu_fault_handler: da:000c0000 pgd:dfd10000 *pgd:9f4d1c01 pte:df4d1f00 *pte:00000000 omap-iommu omap-iommu.0: omap2_iommu_fault_isr: da:000c0000 translation fault omap-iommu omap-iommu.0: iommu_fault_handler: da:000c0000 pgd:dfd10000 *pgd:9f4d1c01 pte:df4d1f00 *pte:00000000 -
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,207 @@ #include <errno.h> #include <fcntl.h> #include <linux/videodev2.h> #include <stdint.h> #include <stdio.h> #include <string.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <unistd.h> uint8_t *buffer; static int xioctl(int fd, int request, void *arg) { int r; do r = ioctl (fd, request, arg); while (-1 == r && EINTR == errno); return r; } int print_caps(int fd) { struct v4l2_capability caps = {}; if (-1 == xioctl(fd, VIDIOC_QUERYCAP, &caps)) { perror("Querying Capabilities"); return 1; } printf( "Driver Caps:\n" " Driver: \"%s\"\n" " Card: \"%s\"\n" " Bus: \"%s\"\n" " Version: %d.%d\n" " Capabilities: %08x\n", caps.driver, caps.card, caps.bus_info, (caps.version>>16)&&0xff, (caps.version>>24)&&0xff, caps.capabilities); struct v4l2_cropcap cropcap = {0}; cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (-1 == xioctl (fd, VIDIOC_CROPCAP, &cropcap)) { perror("Querying Cropping Capabilities"); return 1; } printf( "Camera Cropping:\n" " Bounds: %dx%d+%d+%d\n" " Default: %dx%d+%d+%d\n" " Aspect: %d/%d\n", cropcap.bounds.width, cropcap.bounds.height, cropcap.bounds.left, cropcap.bounds.top, cropcap.defrect.width, cropcap.defrect.height, cropcap.defrect.left, cropcap.defrect.top, cropcap.pixelaspect.numerator, cropcap.pixelaspect.denominator); int support_grbg10 = 0; struct v4l2_fmtdesc fmtdesc = {0}; fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; char fourcc[5] = {0}; char c, e; printf(" FMT : CE Desc\n--------------------\n"); while (0 == xioctl(fd, VIDIOC_ENUM_FMT, &fmtdesc)) { strncpy(fourcc, (char *)&fmtdesc.pixelformat, 4); if (fmtdesc.pixelformat == V4L2_PIX_FMT_SGRBG10) support_grbg10 = 1; c = fmtdesc.flags & 1? 'C' : ' '; e = fmtdesc.flags & 2? 'E' : ' '; printf(" %s: %c%c %s\n", fourcc, c, e, fmtdesc.description); fmtdesc.index++; } if (!support_grbg10) { printf("Doesn't support GRBG10.\n"); return 1; } struct v4l2_format fmt = {0}; fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; fmt.fmt.pix.width = 752; fmt.fmt.pix.height = 480; fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_SGRBG10; fmt.fmt.pix.field = V4L2_FIELD_NONE; if (-1 == xioctl(fd, VIDIOC_S_FMT, &fmt)) { perror("Setting Pixel Format"); return 1; } strncpy(fourcc, (char *)&fmt.fmt.pix.pixelformat, 4); printf( "Selected Camera Mode:\n" " Width: %d\n" " Height: %d\n" " PixFmt: %s\n" " Field: %d\n", fmt.fmt.pix.width, fmt.fmt.pix.height, fourcc, fmt.fmt.pix.field); return 0; } int init_mmap(int fd) { struct v4l2_requestbuffers req = {0}; req.count = 1; req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; req.memory = V4L2_MEMORY_MMAP; if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req)) { perror("Requesting Buffer"); return 1; } struct v4l2_buffer buf = {0}; buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; buf.index = 0; if(-1 == xioctl(fd, VIDIOC_QUERYBUF, &buf)) { perror("Querying Buffer"); return 1; } buffer = mmap (NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, buf.m.offset); printf("Length: %d\nAddress: %p\n", buf.length, buffer); printf("Image Length: %d\n", buf.bytesused); return 0; } int capture_image(int fd) { struct v4l2_buffer buf = {0}; buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; buf.index = 0; if(-1 == xioctl(fd, VIDIOC_QBUF, &buf)) { perror("Query Buffer"); return 1; } if(-1 == xioctl(fd, VIDIOC_STREAMON, &buf.type)) { perror("Start Capture"); return 1; } fd_set fds; FD_ZERO(&fds); FD_SET(fd, &fds); struct timeval tv = {0}; tv.tv_sec = 2; int r = select(fd+1, &fds, NULL, NULL, &tv); if(-1 == r) { perror("Waiting for Frame"); return 1; } if(-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) { perror("Retrieving Frame"); return 1; } int outfd = open("out.img", O_RDWR); write(outfd, buffer, buf.bytesused); close(outfd); return 0; } int main() { int fd; fd = open("/dev/video0", O_RDWR); if (fd == -1) { perror("Opening video device"); return 1; } if(print_caps(fd)) return 1; if(init_mmap(fd)) return 1; if(capture_image(fd)) return 1; close(fd); return 0; }