#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <errno.h> #include <fcntl.h> #include <inttypes.h> #include <ctype.h> #include <sys/time.h> #include <sys/ioctl.h> #include "videodev.h" #include "videodev2.h" #include "struct-dump.h" #include "struct-v4l.h" #include "struct-v4l2.h" /* --------------------------------------------------------------------- */ /* v4l(1) */ static int dump_v4l(int fd, int tab) { struct video_capability capability; struct video_channel channel; struct video_tuner tuner; struct video_audio audio; struct video_picture picture; struct video_buffer buffer; struct video_window window; unsigned int i; printf("general info\n"); memset(&capability,0,sizeof(capability)); if (-1 == ioctl(fd,VIDIOCGCAP,&capability)) return -1; printf(" VIDIOCGCAP\n"); print_struct(stdout,desc_video_capability,&capability,"",tab); printf("\n"); printf("channels\n"); for (i = 0; i capability.channels; i++) { memset(&channel,0,sizeof(channel)); channel.channel = i; if (-1 == ioctl(fd,VIDIOCGCHAN,&channel)) { perror("ioctl VIDIOCGCHAN"); continue; } printf(" VIDIOCGCHAN(%d)\n",i); print_struct(stdout,desc_video_channel,&channel,"",tab); } printf("\n"); printf("tuner\n"); memset(&tuner,0,sizeof(tuner)); if (-1 == ioctl(fd,VIDIOCGTUNER,&tuner)) { perror("ioctl VIDIOCGTUNER"); } else { printf(" VIDIOCGTUNER\n"); print_struct(stdout,desc_video_tuner,&tuner,"",tab); } printf("\n"); printf("audio\n"); memset(&audio,0,sizeof(audio)); if (-1 == ioctl(fd,VIDIOCGAUDIO,&audio)) { perror("ioctl VIDIOCGAUDIO"); } else { printf(" VIDIOCGAUDIO\n"); print_struct(stdout,desc_video_audio,&audio,"",tab); } printf("\n"); printf("picture\n"); memset(&picture,0,sizeof(picture)); if (-1 == ioctl(fd,VIDIOCGPICT,&picture)) { perror("ioctl VIDIOCGPICT"); } else { printf(" VIDIOCGPICT\n"); print_struct(stdout,desc_video_picture,&picture,"",tab); } printf("\n"); printf("buffer\n"); memset(&buffer,0,sizeof(buffer)); if (-1 == ioctl(fd,VIDIOCGFBUF,&buffer)) { perror("ioctl VIDIOCGFBUF"); } else { printf(" VIDIOCGFBUF\n"); print_struct(stdout,desc_video_buffer,&buffer,"",tab); } printf("\n"); printf("window\n"); memset(&window,0,sizeof(window)); if (-1 == ioctl(fd,VIDIOCGWIN,&window)) { perror("ioctl VIDIOCGWIN"); } else { printf(" VIDIOCGWIN\n"); print_struct(stdout,desc_video_window,&window,"",tab); } printf("\n"); return 0; } /* --------------------------------------------------------------------- */ /* v4l2 */ static int dump_v4l2(int fd, int tab) { struct v4l2_capability capability; struct v4l2_standard standard; struct v4l2_input input; struct v4l2_tuner tuner; struct v4l2_fmtdesc fmtdesc; struct v4l2_format format; struct v4l2_framebuffer fbuf; struct v4l2_queryctrl qctrl; int i; printf("general info\n"); memset(&capability,0,sizeof(capability)); if (-1 == ioctl(fd,VIDIOC_QUERYCAP,&capability)) return -1; printf(" VIDIOC_QUERYCAP\n"); print_struct(stdout,desc_v4l2_capability,&capability,"",tab); printf("\n"); printf("standards\n"); for (i = 0;; i++) { memset(&standard,0,sizeof(standard)); standard.index = i; if (-1 == ioctl(fd,VIDIOC_ENUMSTD,&standard)) break; printf(" VIDIOC_ENUMSTD(%d)\n",i); print_struct(stdout,desc_v4l2_standard,&standard,"",tab); } printf("\n"); printf("inputs\n"); for (i = 0;; i++) { memset(&input,0,sizeof(input)); input.index = i; if (-1 == ioctl(fd,VIDIOC_ENUMINPUT,&input)) break; printf(" VIDIOC_ENUMINPUT(%d)\n",i); print_struct(stdout,desc_v4l2_input,&input,"",tab); } printf("\n"); if (capability.capabilities & V4L2_CAP_TUNER) { printf("tuners\n"); for (i = 0;; i++) { memset(&tuner,0,sizeof(tuner)); tuner.index = i; if (-1 == ioctl(fd,VIDIOC_G_TUNER,&tuner)) break; printf(" VIDIOC_G_TUNER(%d)\n",i); print_struct(stdout,desc_v4l2_tuner,&tuner,"",tab); } printf("\n"); } if (capability.capabilities & V4L2_CAP_VIDEO_CAPTURE) { printf("video capture\n"); for (i = 0;; i++) { memset(&fmtdesc,0,sizeof(fmtdesc)); fmtdesc.index = i; fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (-1 == ioctl(fd,VIDIOC_ENUM_FMT,&fmtdesc)) break; printf(" VIDIOC_ENUM_FMT(%d,VIDEO_CAPTURE)\n",i); print_struct(stdout,desc_v4l2_fmtdesc,&fmtdesc,"",tab); } memset(&format,0,sizeof(format)); format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (-1 == ioctl(fd,VIDIOC_G_FMT,&format)) { perror("VIDIOC_G_FMT(VIDEO_CAPTURE)"); } else { printf(" VIDIOC_G_FMT(VIDEO_CAPTURE)\n"); print_struct(stdout,desc_v4l2_format,&format,"",tab); } printf("\n"); } if (capability.capabilities & V4L2_CAP_VIDEO_OVERLAY) { printf("video overlay\n"); for (i = 0;; i++) { memset(&fmtdesc,0,sizeof(fmtdesc)); fmtdesc.index = i; fmtdesc.type = V4L2_BUF_TYPE_VIDEO_OVERLAY; if (-1 == ioctl(fd,VIDIOC_ENUM_FMT,&fmtdesc)) break; printf(" VIDIOC_ENUM_FMT(%d,VIDEO_OVERLAY)\n",i); print_struct(stdout,desc_v4l2_fmtdesc,&fmtdesc,"",tab); } memset(&format,0,sizeof(format)); format.type = V4L2_BUF_TYPE_VIDEO_OVERLAY; if (-1 == ioctl(fd,VIDIOC_G_FMT,&format)) { perror("VIDIOC_G_FMT(VIDEO_OVERLAY)"); } else { printf(" VIDIOC_G_FMT(VIDEO_OVERLAY)\n"); print_struct(stdout,desc_v4l2_format,&format,"",tab); } memset(&fbuf,0,sizeof(fbuf)); if (-1 == ioctl(fd,VIDIOC_G_FBUF,&fbuf)) { perror("VIDIOC_G_FBUF"); } else { printf(" VIDIOC_G_FBUF\n"); print_struct(stdout,desc_v4l2_framebuffer,&fbuf,"",tab); } printf("\n"); } if (capability.capabilities & V4L2_CAP_VBI_CAPTURE) { printf("vbi capture\n"); for (i = 0;; i++) { memset(&fmtdesc,0,sizeof(fmtdesc)); fmtdesc.index = i; fmtdesc.type = V4L2_BUF_TYPE_VBI_CAPTURE; if (-1 == ioctl(fd,VIDIOC_ENUM_FMT,&fmtdesc)) break; printf(" VIDIOC_ENUM_FMT(%d,VBI_CAPTURE)\n",i); print_struct(stdout,desc_v4l2_fmtdesc,&fmtdesc,"",tab); } memset(&format,0,sizeof(format)); format.type = V4L2_BUF_TYPE_VBI_CAPTURE; if (-1 == ioctl(fd,VIDIOC_G_FMT,&format)) { perror("VIDIOC_G_FMT(VBI_CAPTURE)"); } else { printf(" VIDIOC_G_FMT(VBI_CAPTURE)\n"); print_struct(stdout,desc_v4l2_format,&format,"",tab); } printf("\n"); } printf("controls\n"); for (i = 0;; i++) { memset(&qctrl,0,sizeof(qctrl)); qctrl.id = V4L2_CID_BASE+i; if (-1 == ioctl(fd,VIDIOC_QUERYCTRL,&qctrl)) break; if (qctrl.flags & V4L2_CTRL_FLAG_DISABLED) continue; printf(" VIDIOC_QUERYCTRL(BASE+%d)\n",i); print_struct(stdout,desc_v4l2_queryctrl,&qctrl,"",tab); } for (i = 0;; i++) { memset(&qctrl,0,sizeof(qctrl)); qctrl.id = V4L2_CID_PRIVATE_BASE+i; if (-1 == ioctl(fd,VIDIOC_QUERYCTRL,&qctrl)) break; if (qctrl.flags & V4L2_CTRL_FLAG_DISABLED) continue; printf(" VIDIOC_QUERYCTRL(PRIVATE_BASE+%d)\n",i); print_struct(stdout,desc_v4l2_queryctrl,&qctrl,"",tab); } return 0; } /* --------------------------------------------------------------------- */ /* main */ int main(int argc, char *argv[]) { char dummy[256]; char *device = "/dev/video0"; int tab = 1, ok = 0; int fd; if (argc > 1) device = argv[1]; fd = open(device,O_RDONLY); if (-1 == fd) { fprintf(stderr,"open %s: %s\n",device,strerror(errno)); exit(1); }; if (-1 != ioctl(fd,VIDIOC_QUERYCAP,dummy)) { printf("\n### v4l2 device info [%s] ###\n",device); dump_v4l2(fd,tab); ok = 1; } if (-1 != ioctl(fd,VIDIOCGCAP,dummy)) { printf("\n### video4linux device info [%s] ###\n",device); dump_v4l(fd,tab); ok = 1; } if (!ok) { fprintf(stderr,"%s: not an video4linux device\n",device); exit(1); } return 0; } /* * Local variables: * c-basic-offset: 8 * End: */ 代码来源：http://read.pudn.com/downloads142/sourcecode/others/617367/xawtv_3.91/xawtv-3.91/console/v4l-info.c__.htm
