if((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == V4L2_CAP_VIDEO_CAPTURE){ printf("Camera device %s: support capture\n",FILE_VIDEO1); } if((cap.capabilities & V4L2_CAP_STREAMING) == V4L2_CAP_STREAMING){ printf("Camera device %s: support streaming.\n",FILE_VIDEO1); } //3. set f...
Capture参数包括模式、帧率等。 structv4l2_streamparmparams;memset(¶ms,0,sizeof(params));params.type=V4L2_BUF_TYPE_VIDEO_CAPTURE;params.parm.capture.capturemode=V4L2_MODE_HIGHQUALITY;params.parm.capture.timeperframe.numerator=1;params.parm.capture.timeperframe.denominator=25;ret=ioctl(fd,VIDIOC_S...
#define V4L2_CAP_VIDEO_OUTPUT_OVERLAY 0x00000200 #define V4L2_CAP_HW_FREQ_SEEK 0x00000400 #define V4L2_CAP_RDS_OUTPUT 0x00000800 #define V4L2_CAP_VIDEO_CAPTURE_MPLANE 0x00001000 #define V4L2_CAP_VIDEO_OUTPUT_MPLANE 0x00002000 #define V4L2_CAP_VIDEO_M2M_MPLANE 0x00004000 #define V4L2_CAP_...
/*设置摄像头采集的帧率*/structv4l2_streamparmparm;parm.type=V4L2_BUF_TYPE_VIDEO_CAPTURE;parm.parm.capture.timeperframe.numerator=1;parm.parm.capture.timeperframe.denominator=30;parm.parm.capture.capturemode=0;if(ioctl(uvc_video_fd,VIDIOC_S_PARM,&parm)==-1){perror("VIDIOC_S_PARM failed\n"...
capture。 应用使用时,parms.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE; 其中通过设定 parms->capture.capturemode(V4L2_MODE_VIDEO 或 V4L2_MODE_IMAGE), 实现视频或图片的采集。通过设定 parms->capture.timeperframe,可以设置帧率。 3.6 VIDIOC_G_PARM 3.6.1 Parameters 代码语言:javascript 复制 Parameter(...
struct v4l2_format是v4l2中一个很重要的结构体,用于视频格式设置,定义如下: structv4l2_format{ __u32type; union {structv4l2_pix_formatpix;/* V4L2_BUF_TYPE_VIDEO_CAPTURE */structv4l2_pix_format_mplanepix_mp;/* V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE */structv4l2_windowwin;/* V4L2_BUF_TYPE_VIDEO...
* 通常对于一个摄像设备,它的驱动能力一般仅支持视频采集(V4L2_CAP_VIDEO_CAPTURE) * 和ioctl控制(V4L2_CAP_STREAMING),有些还支持通过系统调用进行读写(V4L2_CAP_READWRITE) *@author: 缪庆瑞 *@date: 2019.08.07 */ void V4L2Capture::ioctlQueryCapability() ...
通过ret = ops->vidioc_querycap(file, fh, cap);其中 struct video_device *vfd = video_devdata(file);const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;可以看出,__video_do_ioctl 函数又调用了 struct video_device vivi_template 结构体李曼的 .ioctl_ops = &vivi_ioctl_ops,然后根据宏的名字来...
V4L2_CAP_VIDEO_CAPTURE_MPLANE 0x00001000 /* Is a video output device that supports multiplanar formats */ #define V4L2_CAP_VIDEO_OUTPUT_MPLANE 0x00002000 #define V4L2_CAP_TUNER 0x00010000 /* has a tuner */ #define V4L2_CAP_AUDIO 0x00020000 /* has audio support */ #define V4L2_CAP_...
vind0_isp 是 isp 模块时钟,实际使用时可以根据 sensor 的帧率和分辨率来设置; vind0_clk 表示 csi clk,计算公式:帧率 x (vts)x (hts)x 1(wdr 则为 2) / 8 / 1(双 pixel则为 2) / 1000000,向上取整,单位为 MH;vind0_isp 表示 isp clk,计算公式:帧率 x 宽 x 高 x 1.2 / 1000000,向上取整...