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v4l2设置图像分辨率失败的问题

news 2025/9/6 7:59:08

1.命令行设置分辨率指令

media-ctl -d /dev/media0 --set-v4l2 '"drive_dev":0[fmt:SBGGR12_1X12/1600x342]'

2.看了上面的命令设置分辨率，搞得我以为设置分辨率要操作媒体节点 /dev/media0，结果一直设置失败，错误如下：


VIDIOC_SUBDEV_S_FMT failed: Inappropriate ioctl for device (errno=25)

3.问了AI以后发现是操作的设备节点错误，需要操作/dev/v4l-subdevX

可以通过下面的命令[media-ctl -p -d /dev/media0]来查询 /dev/media0对应的sub节点

media-ctl -p -d /dev/media0
Media controller API version 5.10.226Media device information
------------------------
driver          rkcif
model           rkcif-mipi-lvds
serial          
bus info        
hw revision     0x0
driver version  5.10.226Device topology
- entity 1: stream_cif_mipi_id0 (1 pad, 11 links)type Node subtype V4L flags 0device node name /dev/video0pad0: Sink<- "rockchip-mipi-csi2":1 [ENABLED]<- "rockchip-mipi-csi2":2 []<- "rockchip-mipi-csi2":3 []<- "rockchip-mipi-csi2":4 []<- "rockchip-mipi-csi2":5 []<- "rockchip-mipi-csi2":6 []<- "rockchip-mipi-csi2":7 []<- "rockchip-mipi-csi2":8 []<- "rockchip-mipi-csi2":9 []<- "rockchip-mipi-csi2":10 []<- "rockchip-mipi-csi2":11 []- entity 5: stream_cif_mipi_id1 (1 pad, 11 links)type Node subtype V4L flags 0device node name /dev/video1pad0: Sink<- "rockchip-mipi-csi2":1 []<- "rockchip-mipi-csi2":2 [ENABLED]<- "rockchip-mipi-csi2":3 []<- "rockchip-mipi-csi2":4 []<- "rockchip-mipi-csi2":5 []<- "rockchip-mipi-csi2":6 []<- "rockchip-mipi-csi2":7 []<- "rockchip-mipi-csi2":8 []<- "rockchip-mipi-csi2":9 []<- "rockchip-mipi-csi2":10 []<- "rockchip-mipi-csi2":11 []- entity 9: stream_cif_mipi_id2 (1 pad, 11 links)type Node subtype V4L flags 0device node name /dev/video2pad0: Sink<- "rockchip-mipi-csi2":1 []<- "rockchip-mipi-csi2":2 []<- "rockchip-mipi-csi2":3 [ENABLED]<- "rockchip-mipi-csi2":4 []<- "rockchip-mipi-csi2":5 []<- "rockchip-mipi-csi2":6 []<- "rockchip-mipi-csi2":7 []<- "rockchip-mipi-csi2":8 []<- "rockchip-mipi-csi2":9 []<- "rockchip-mipi-csi2":10 []<- "rockchip-mipi-csi2":11 []- entity 13: stream_cif_mipi_id3 (1 pad, 11 links)type Node subtype V4L flags 0device node name /dev/video3pad0: Sink<- "rockchip-mipi-csi2":1 []<- "rockchip-mipi-csi2":2 []<- "rockchip-mipi-csi2":3 []<- "rockchip-mipi-csi2":4 [ENABLED]<- "rockchip-mipi-csi2":5 []<- "rockchip-mipi-csi2":6 []<- "rockchip-mipi-csi2":7 []<- "rockchip-mipi-csi2":8 []<- "rockchip-mipi-csi2":9 []<- "rockchip-mipi-csi2":10 []<- "rockchip-mipi-csi2":11 []- entity 17: rkcif_scale_ch0 (1 pad, 11 links)type Node subtype V4L flags 0device node name /dev/video4pad0: Sink<- "rockchip-mipi-csi2":1 []<- "rockchip-mipi-csi2":2 []<- "rockchip-mipi-csi2":3 []<- "rockchip-mipi-csi2":4 []<- "rockchip-mipi-csi2":5 [ENABLED]<- "rockchip-mipi-csi2":6 []<- "rockchip-mipi-csi2":7 []<- "rockchip-mipi-csi2":8 []<- "rockchip-mipi-csi2":9 []<- "rockchip-mipi-csi2":10 []<- "rockchip-mipi-csi2":11 []- entity 21: rkcif_scale_ch1 (1 pad, 11 links)type Node subtype V4L flags 0device node name /dev/video5pad0: Sink<- "rockchip-mipi-csi2":1 []<- "rockchip-mipi-csi2":2 []<- "rockchip-mipi-csi2":3 []<- "rockchip-mipi-csi2":4 []<- "rockchip-mipi-csi2":5 []<- "rockchip-mipi-csi2":6 [ENABLED]<- "rockchip-mipi-csi2":7 []<- "rockchip-mipi-csi2":8 []<- "rockchip-mipi-csi2":9 []<- "rockchip-mipi-csi2":10 []<- "rockchip-mipi-csi2":11 []- entity 25: rkcif_scale_ch2 (1 pad, 11 links)type Node subtype V4L flags 0device node name /dev/video6pad0: Sink<- "rockchip-mipi-csi2":1 []<- "rockchip-mipi-csi2":2 []<- "rockchip-mipi-csi2":3 []<- "rockchip-mipi-csi2":4 []<- "rockchip-mipi-csi2":5 []<- "rockchip-mipi-csi2":6 []<- "rockchip-mipi-csi2":7 [ENABLED]<- "rockchip-mipi-csi2":8 []<- "rockchip-mipi-csi2":9 []<- "rockchip-mipi-csi2":10 []<- "rockchip-mipi-csi2":11 []- entity 29: rkcif_scale_ch3 (1 pad, 11 links)type Node subtype V4L flags 0device node name /dev/video7pad0: Sink<- "rockchip-mipi-csi2":1 []<- "rockchip-mipi-csi2":2 []<- "rockchip-mipi-csi2":3 []<- "rockchip-mipi-csi2":4 []<- "rockchip-mipi-csi2":5 []<- "rockchip-mipi-csi2":6 []<- "rockchip-mipi-csi2":7 []<- "rockchip-mipi-csi2":8 [ENABLED]<- "rockchip-mipi-csi2":9 []<- "rockchip-mipi-csi2":10 []<- "rockchip-mipi-csi2":11 []- entity 33: rkcif_tools_id0 (1 pad, 11 links)type Node subtype V4L flags 0device node name /dev/video8pad0: Sink<- "rockchip-mipi-csi2":1 []<- "rockchip-mipi-csi2":2 []<- "rockchip-mipi-csi2":3 []<- "rockchip-mipi-csi2":4 []<- "rockchip-mipi-csi2":5 []<- "rockchip-mipi-csi2":6 []<- "rockchip-mipi-csi2":7 []<- "rockchip-mipi-csi2":8 []<- "rockchip-mipi-csi2":9 [ENABLED]<- "rockchip-mipi-csi2":10 []<- "rockchip-mipi-csi2":11 []- entity 37: rkcif_tools_id1 (1 pad, 11 links)type Node subtype V4L flags 0device node name /dev/video9pad0: Sink<- "rockchip-mipi-csi2":1 []<- "rockchip-mipi-csi2":2 []<- "rockchip-mipi-csi2":3 []<- "rockchip-mipi-csi2":4 []<- "rockchip-mipi-csi2":5 []<- "rockchip-mipi-csi2":6 []<- "rockchip-mipi-csi2":7 []<- "rockchip-mipi-csi2":8 []<- "rockchip-mipi-csi2":9 []<- "rockchip-mipi-csi2":10 [ENABLED]<- "rockchip-mipi-csi2":11 []- entity 41: rkcif_tools_id2 (1 pad, 11 links)type Node subtype V4L flags 0device node name /dev/video10pad0: Sink<- "rockchip-mipi-csi2":1 []<- "rockchip-mipi-csi2":2 []<- "rockchip-mipi-csi2":3 []<- "rockchip-mipi-csi2":4 []<- "rockchip-mipi-csi2":5 []<- "rockchip-mipi-csi2":6 []<- "rockchip-mipi-csi2":7 []<- "rockchip-mipi-csi2":8 []<- "rockchip-mipi-csi2":9 []<- "rockchip-mipi-csi2":10 []<- "rockchip-mipi-csi2":11 [ENABLED]- entity 45: rockchip-mipi-csi2 (12 pads, 122 links)type V4L2 subdev subtype Unknown flags 0device node name /dev/v4l-subdev0pad0: Sink[fmt:SBGGR12_1X12/1600x342 field:none colorspace:rawcrop.bounds:(0,0)/1600x342crop:(0,0)/1600x342]<- "rockchip-csi2-dphy0":1 [ENABLED]pad1: Source-> "stream_cif_mipi_id0":0 [ENABLED]-> "stream_cif_mipi_id1":0 []-> "stream_cif_mipi_id2":0 []-> "stream_cif_mipi_id3":0 []-> "rkcif_scale_ch0":0 []-> "rkcif_scale_ch1":0 []-> "rkcif_scale_ch2":0 []-> "rkcif_scale_ch3":0 []-> "rkcif_tools_id0":0 []-> "rkcif_tools_id1":0 []-> "rkcif_tools_id2":0 []pad2: Source-> "stream_cif_mipi_id0":0 []-> "stream_cif_mipi_id1":0 [ENABLED]-> "stream_cif_mipi_id2":0 []-> "stream_cif_mipi_id3":0 []-> "rkcif_scale_ch0":0 []-> "rkcif_scale_ch1":0 []-> "rkcif_scale_ch2":0 []-> "rkcif_scale_ch3":0 []-> "rkcif_tools_id0":0 []-> "rkcif_tools_id1":0 []-> "rkcif_tools_id2":0 []pad3: Source-> "stream_cif_mipi_id0":0 []-> "stream_cif_mipi_id1":0 []-> "stream_cif_mipi_id2":0 [ENABLED]-> "stream_cif_mipi_id3":0 []-> "rkcif_scale_ch0":0 []-> "rkcif_scale_ch1":0 []-> "rkcif_scale_ch2":0 []-> "rkcif_scale_ch3":0 []-> "rkcif_tools_id0":0 []-> "rkcif_tools_id1":0 []-> "rkcif_tools_id2":0 []pad4: Source-> "stream_cif_mipi_id0":0 []-> "stream_cif_mipi_id1":0 []-> "stream_cif_mipi_id2":0 []-> "stream_cif_mipi_id3":0 [ENABLED]-> "rkcif_scale_ch0":0 []-> "rkcif_scale_ch1":0 []-> "rkcif_scale_ch2":0 []-> "rkcif_scale_ch3":0 []-> "rkcif_tools_id0":0 []-> "rkcif_tools_id1":0 []-> "rkcif_tools_id2":0 []pad5: Source-> "stream_cif_mipi_id0":0 []-> "stream_cif_mipi_id1":0 []-> "stream_cif_mipi_id2":0 []-> "stream_cif_mipi_id3":0 []-> "rkcif_scale_ch0":0 [ENABLED]-> "rkcif_scale_ch1":0 []-> "rkcif_scale_ch2":0 []-> "rkcif_scale_ch3":0 []-> "rkcif_tools_id0":0 []-> "rkcif_tools_id1":0 []-> "rkcif_tools_id2":0 []pad6: Source-> "stream_cif_mipi_id0":0 []-> "stream_cif_mipi_id1":0 []-> "stream_cif_mipi_id2":0 []-> "stream_cif_mipi_id3":0 []-> "rkcif_scale_ch0":0 []-> "rkcif_scale_ch1":0 [ENABLED]-> "rkcif_scale_ch2":0 []-> "rkcif_scale_ch3":0 []-> "rkcif_tools_id0":0 []-> "rkcif_tools_id1":0 []-> "rkcif_tools_id2":0 []pad7: Source-> "stream_cif_mipi_id0":0 []-> "stream_cif_mipi_id1":0 []-> "stream_cif_mipi_id2":0 []-> "stream_cif_mipi_id3":0 []-> "rkcif_scale_ch0":0 []-> "rkcif_scale_ch1":0 []-> "rkcif_scale_ch2":0 [ENABLED]-> "rkcif_scale_ch3":0 []-> "rkcif_tools_id0":0 []-> "rkcif_tools_id1":0 []-> "rkcif_tools_id2":0 []pad8: Source-> "stream_cif_mipi_id0":0 []-> "stream_cif_mipi_id1":0 []-> "stream_cif_mipi_id2":0 []-> "stream_cif_mipi_id3":0 []-> "rkcif_scale_ch0":0 []-> "rkcif_scale_ch1":0 []-> "rkcif_scale_ch2":0 []-> "rkcif_scale_ch3":0 [ENABLED]-> "rkcif_tools_id0":0 []-> "rkcif_tools_id1":0 []-> "rkcif_tools_id2":0 []pad9: Source-> "stream_cif_mipi_id0":0 []-> "stream_cif_mipi_id1":0 []-> "stream_cif_mipi_id2":0 []-> "stream_cif_mipi_id3":0 []-> "rkcif_scale_ch0":0 []-> "rkcif_scale_ch1":0 []-> "rkcif_scale_ch2":0 []-> "rkcif_scale_ch3":0 []-> "rkcif_tools_id0":0 [ENABLED]-> "rkcif_tools_id1":0 []-> "rkcif_tools_id2":0 []pad10: Source-> "stream_cif_mipi_id0":0 []-> "stream_cif_mipi_id1":0 []-> "stream_cif_mipi_id2":0 []-> "stream_cif_mipi_id3":0 []-> "rkcif_scale_ch0":0 []-> "rkcif_scale_ch1":0 []-> "rkcif_scale_ch2":0 []-> "rkcif_scale_ch3":0 []-> "rkcif_tools_id0":0 []-> "rkcif_tools_id1":0 [ENABLED]-> "rkcif_tools_id2":0 []pad11: Source-> "stream_cif_mipi_id0":0 []-> "stream_cif_mipi_id1":0 []-> "stream_cif_mipi_id2":0 []-> "stream_cif_mipi_id3":0 []-> "rkcif_scale_ch0":0 []-> "rkcif_scale_ch1":0 []-> "rkcif_scale_ch2":0 []-> "rkcif_scale_ch3":0 []-> "rkcif_tools_id0":0 []-> "rkcif_tools_id1":0 []-> "rkcif_tools_id2":0 [ENABLED]- entity 58: rockchip-csi2-dphy0 (2 pads, 2 links)type V4L2 subdev subtype Unknown flags 0device node name /dev/v4l-subdev1pad0: Sink[fmt:SBGGR12_1X12/1600x342@1/90 field:none colorspace:raw]<- "xxxxx":0 [ENABLED]pad1: Source-> "rockchip-mipi-csi2":0 [ENABLED]- entity 63: fs6031 (1 pad, 1 link)type V4L2 subdev subtype Sensor flags 0device node name /dev/v4l-subdev2pad0: Source[fmt:SBGGR12_1X12/1600x342@1/90 field:none colorspace:raw]-> "rockchip-csi2-dphy0":0 [ENABLED]

通过上面的命令查询到/dev/media0对应的子设备节点是 /dev/v4l-subdev2，主节点为 /dev/video0

4.修改设备节点以后设置成功了，下面是完整代码

#define LV_WIDTH_NUMBER 1600  // 1600 //4912
#define LV_HEIGHT_NUMBER 342int xx_set_resolution(int main_fd, int sub_fd, uint8_t format_type) {int ret = 0;struct v4l2_format format_main;struct v4l2_subdev_format format_sub;memset(&format_sub, 0, sizeof(format_sub));format_sub.pad = 0;format_sub.which = V4L2_SUBDEV_FORMAT_ACTIVE;format_sub.format.width = LV_WIDTH_NUMBER;format_sub.format.height = LV_HEIGHT_NUMBER;format_sub.format.field = V4L2_FIELD_ANY;format_sub.format.code = V4L2_MBUS_FMT_SBGGR12_1X12;ret = ioctl(sub_fd, VIDIOC_SUBDEV_S_FMT, &format_sub);if (ret < 0) {printf("VIDIOC_SUBDEV_S_FMT failed: %s (errno=%d)\n", strerror(errno), errno);return ret;}// 成功设置 subdevprintf("Subdev format set to %dx%d\n", format_sub.format.width, format_sub.format.height);// 设置 video nodememset(&format_main, 0, sizeof(format_main));format_main.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;  // 显式指定format_main.fmt.pix_mp.pixelformat = V4L2_PIX_FMT_SBGGR12;format_main.fmt.pix_mp.width = LV_WIDTH_NUMBER;format_main.fmt.pix_mp.height = LV_HEIGHT_NUMBER;format_main.fmt.pix_mp.field = V4L2_FIELD_ANY;ret = ioctl(main_fd, VIDIOC_S_FMT, &format_main);if (ret < 0) {printf("VIDIOC_S_FMT failed: %s (errno=%d)\n", strerror(errno), errno);return ret;}printf("Video node format: %dx%d\n", format_main.fmt.pix_mp.width, format_main.fmt.pix_mp.height);return 0;
}

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