v4l2-clk.c v4l2-dv-timings.c v4l2-i2c.c v4l2-subdev.c v4l2-common.c v4l2-event.c v4l2-ioctl.c v4l2-trace.c linux_5.10/include/media$ls## v4l2相关头文件cec.h dvb-usb-ids.h rc-core.h v4l2-fh.h videobuf2-dma-sg.h cec-notifier.h dvb_vb2.h rc-map.h v4l2-flash-led-class.h ...
v4l2_buf_type type,uint32_tindex);voidresize();voidclear();voidqueue(intfd);voiddequeue(v4l2_buffer &b);staticvoidprintBuffer(constv4l2_buffer &buf,constchar*prefix);
ret = __v4l2_event_dequeue(fh, event);} while (ret == -ENOENT);if (fh->vdev->lock)mutex_lock(fh->vdev->lock);return ret;}EXPORT_SYMBOL_GPL(v4l2_event_dequeue);/* Caller must hold fh->vdev->fh_lock! */static struct v4l2_subscribed_event *v4l2_event_subscribed(...
V4L2_CID_MIN_BUFFERS_FOR_CAPTURE (Get the minimum buffers to be allocated on capture plane. Read only. Valid afterV4L2_EVENT_RESOLUTION_CHANGE) V4L2_CID_MPEG_VIDEODEC_INPUT_METADATA V4L2_CID_MPEG_VIDEODEC_METADATA V4L2_CID_MPEG_VIDEO_BUF_API_TYPE ...
return -ENOIOCTLCMD;return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);case VIDIOC_SUBSCRIBE_EVENT: return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);case VIDIOC_UNSUBSCRIBE_EVENT: return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);#...
How would I event listen for the event using v4l2r? I see subscribe_event but not a way to check for events. You can use ioctl::dqevent() to check if an event was pending and dequeue it. This can be adequate if you only use a single thread, but a better design is probably to ...
This function: 1) verifies current state, 2) stop streaming and dequeues any queued buffers, including those previously passed to the driver (after waiting for the driver to finish). This call can be used for pausing playback. The return values from this function are intended to be directly...
kworker/0:3-1854 [000] … 1253.631433: rtcpu_vinotify_event: tstamp:39372821082 tag:ATOMP_FE channel:0x00 frame:0 vi_tstamp:39372794898 data:0x00000000 kworker/0:3-1854 [000] … 1253.631433: rtcpu_vinotify_event: tstamp:39372821227 tag:RESER...
调用轨迹如下:v4l_dqbuf()->uvc_ioctl_dqbuf()->uvc_dequeue_buffer()->vb2_dqbuf()->vb2_internal_dqbuf()->vb2_core_dqbuf()。 vb2_core_dqbuf()是核心操作函数,取出缓存给用户空间使用。 VIDIOC_DQBUF本身并不执行内存的搬移动作,它会睡眠等待缓存。
#define MMAL_PORT_CAPABILITY_SUPPORTS_EVENT_FORMAT_CHANGE 0x04 /* mmal port structure (MMAL_PORT_T) * * most elements are informational only, the pointer values for * interogation messages are generally provided as additional * strucures within the message. When used to set values only teh ...