3.2.5 vio2display 示例介绍
示例简介
vio2display 是一个位于 /app/cdev_demo 目录中的 C 语言接口 开发代码示例，用于演示如何使用 c 语言打开摄像头，并将摄像头采集的数据呈现在显示器上。参考这个示例，用户可以理解并开发相关应用。
效果展示
可以看到，执行示例时，接到 RDK HDMI 的显示屏拍摄到了显示屏上的执行记录。
硬件准备
硬件连接
该示例不需要鼠标和键盘，所以这里连接了摄像头 HDMI 显示屏，网线接口，电源线
快速开始
代码以及板端位置
进入到 /app/cdev_demo/vio2display 位置，可以看到 vio2display 示例里面包含了 2 个文件
root@ubuntu:/app/cdev_demo/vio2display# tree
.
├── Makefile
└── vio2display.c
编译以及运行
我们直接在该目录下使用 make 即可编译出 vio2display 可执行文件。
root@ubuntu:/app/cdev_demo/vio2display# tree
.
├── Makefile
├── vio2display
├── vio2display.c
└── vio2display.o
执行效果
我们首先要关闭 light 服务 , 然后再执行 vio2display ，这里我们要注意摄像头的分辨率，根据摄像头的分辨率填写 -h 和 -w 参数。
root@ubuntu:/app/cdev_demo/vio2display# systemctl stop lightdm
root@ubuntu:/app/cdev_demo/vio2display# ./vio2display -h 1080 -w 1920
Opened DRM device: /dev/dri/card0
1920x1080
1360x768
1280x1024
1280x720
1024x768
800x600
720x576
720x480
640x480
disp_w=1920, disp_h=1080
2000/01/01 12:45:58.112 !INFO [OpenCamera][0450]hbn module
set camera fps: -1,width: 1920,height: 1080
Camera 0:
mipi_host: 0
Camera 1:
mipi_host: 2
Camera 2:
mipi_host: 0
Camera 3:
mipi_host: 0
mipi mclk is not configed.
Searching camera sensor on device: /proc/device-tree/soc/cam/vcon@0 i2c bus: 6 mipi rx phy: 0
WARN: Sensor Name: sc1330t, Expected Chip ID: 0xCA18, Actual Chip ID Read: 0x00
WARN: Sensor Name: irs2875-tof, Expected Chip ID: 0x2875, Actual Chip ID Read: 0x00
WARN: Sensor Name: sc230ai-10fps, Expected Chip ID: 0xCB34, Actual Chip ID Read: 0x00
WARN: Sensor Name: sc230ai-30fps, Expected Chip ID: 0xCB34, Actual Chip ID Read: 0x00
WARN: Sensor Name: sc132gs-1280p, Expected Chip ID: 0x132, Actual Chip ID Read: 0x00
WARN: Sensor Name: sc035hgs, Expected Chip ID: 0x5A, Actual Chip ID Read: 0x00
WARN: Sensor Name: ov5640, Expected Chip ID: 0x5640, Actual Chip ID Read: 0x00
WARN: Sensor Name: f37, Expected Chip ID: 0xF37, Actual Chip ID Read: 0x00
WARN: Sensor Name: imx415-30fps-2lane, Expected Chip ID: 0x03, Actual Chip ID Read: 0x00
WARN: Sensor Name: imx415-30fps-4lane, Expected Chip ID: 0x03, Actual Chip ID Read: 0x00
WARN: Sensor Name: sc202cs-1600x1200, Expected Chip ID: 0xEB52, Actual Chip ID Read: 0x00
WARN: Sensor Name: irs2381c-tof, Expected Chip ID: 0x2381, Actual Chip ID Read: 0x00
[0] INFO: Found sensor name:imx219-1920x1080-30fps on mipi rx csi 0, i2c addr 0x10, config_file:linear_1920x1080_raw10_30fps_2lane.c
WARN: Sensor Name: ov5647-640x480-60fps, Expected Chip ID: 0x5647, Actual Chip ID Read: 0x00
WARN: Sensor Name: ov5647-1280x960-30fps, Expected Chip ID: 0x5647, Actual Chip ID Read: 0x00
WARN: Sensor Name: ov5647-1920x1080-30fps, Expected Chip ID: 0x5647, Actual Chip ID Read: 0x00
WARN: Sensor Name: ov5647-2592x1944-15fps, Expected Chip ID: 0x5647, Actual Chip ID Read: 0x00
WARN: Sensor Name: imx477-1280x960-120fps, Expected Chip ID: 0x477, Actual Chip ID Read: 0x00
WARN: Sensor Name: imx477-1920x1080-50fps, Expected Chip ID: 0x477, Actual Chip ID Read: 0x00
WARN: Sensor Name: imx477-2016x1520-40fps, Expected Chip ID: 0x477, Actual Chip ID Read: 0x00
WARN: Sensor Name: imx477-4000x3000-10fps, Expected Chip ID: 0x477, Actual Chip ID Read: 0x00
WARN: Sensor Name: sc035hgs-vc0, Expected Chip ID: 0x35, Actual Chip ID Read: 0x00
WARN: Sensor Name: sc035hgs-vc1, Expected Chip ID: 0x35, Actual Chip ID Read: 0x00
WARN: Sensor Name: sc231ai-30fps, Expected Chip ID: 0xCB6A, Actual Chip ID Read: 0x00
WARN: Sensor Name: imx586-30fps-4lane, Expected Chip ID: 0x586, Actual Chip ID Read: 0x00
WARN: Sensor Name: os08c10-30fps-2lane, Expected Chip ID: 0x53, Actual Chip ID Read: 0x00
2000/01/01 12:45:58.244 !INFO [CamInitParam][0326]Setting VSE channel-0: input_width:1920, input_height:1080, dst_w:1920, dst_h:1080
2000/01/01 12:45:58.244 !INFO [CamInitParam][0326]Setting VSE channel-1: input_width:1920, input_height:1080, dst_w:1920, dst_h:1080
2000/01/01 12:45:58.244 !INFO [vp_vin_init][0055]csi0 ignore mclk ex attr, because mclk is not configed at device tree.
================= VP Modules Status ====================
======================== VFLOW =========================
(active)[S0] vin0_C0*(dma)-m2m-isp0_C0-m2m-vse0_C0
========================= SIF ==========================
------------------- flow0 info -------------------
rx_index:0
vc_index:0
ipi_channels:1
width:1920
height:1080
format:0x2b
online_isp:1
ddr_en:0
bufnum:0
emb_en:0
embeded_dependence:0
embeded_width:0
embeded_height:0
size_err_cnt:1
========================= ISP ==========================
------------------- flow0 info -------------------
input_mode:2
sched_mode:0
tile_mode:0
af_mode:0
sensor_mode:0
input_width:1920
input_height:1080
input_format:1
input_bit_width:10
input_crop_x:0
input_crop_y:0
input_crop_w:1920
input_crop_h:1080
ddr_en:1
output_format:2
output_bit_width:8
========================= VSE ==========================
------------------- flow0 info -------------------
input_fps:0/0
input_width:1920
input_height:1080
input_format:2
input_bitwidth:8
dns0 channel: roi [0][0][1920][1080], target [1920][1080], fps [0/0]
dns1 channel: roi [0][0][1920][1080], target [1920][1080], fps [0/0]
========================= VENC =========================
========================= VDEC =========================
========================= JENC =========================
======================= Buffer =========================
----------------------------------------------
flowid module cid chn FREE REQ PRO COM USED
----------------------------------------------
0 vin0 0 0 16 0 0 0 0
0 vin0 0 8 0 1 2 0 0
0 isp0 0 0 16 0 0 0 0
0 isp0 0 8 0 3 0 0 0
0 vse0 0 0 16 0 0 0 0
0 vse0 0 8 0 3 0 0 0
0 vse0 0 9 0 3 0 0 0
----------------------------------------------
flowid module cid chn FREE REQ PRO COM USED
----------------------------------------------
0 vin0 0 0 16 0 0 0 0
0 vin0 0 8 0 1 2 0 0
0 isp0 0 0 16 0 0 0 0
0 isp0 0 8 0 3 0 0 0
0 vse0 0 0 16 0 0 0 0
0 vse0 0 8 0 3 0 0 0
0 vse0 0 9 0 3 0 0 0
========================= END ===========================
sp_open_camera success!
Opened DRM device: /dev/dri/card0
DRM is available, using libdrm for rendering.
------------------------------------------------------
Plane 0:
Plane ID: 41
Src W: 1920
Src H: 1080
CRTC X: 0
CRTC Y: 0
CRTC W: 1920
CRTC H: 1080
Format: NV12
Z Pos: 0
Alpha: 65535
Pixel Blend Mode: 1
Rotation: -1
Color Encoding: -1
Color Range: -1
------------------------------------------------------
Setting DRM client capabilities...
Setting up KMS...
CRTC ID: 31
CRTC ID: 63
Number of connectors: 1
Connector ID: 74
Type: 11
Type Name: HDMI-A
Connection: Connected
Modes: 32
Subpixel: 1
Mode 0: 1920x1080 @ 60Hz
Mode 1: 1920x1080 @ 60Hz
Mode 2: 1920x1080 @ 60Hz
Mode 3: 1920x1080i @ 60Hz
Mode 4: 1920x1080i @ 60Hz
Mode 5: 1920x1080 @ 50Hz
Mode 6: 1920x1080i @ 50Hz
Mode 7: 1280x1024 @ 60Hz
Mode 8: 1440x900 @ 60Hz
Mode 9: 1360x768 @ 60Hz
Mode 10: 1280x720 @ 60Hz
Mode 11: 1280x720 @ 60Hz
Mode 12: 1280x720 @ 50Hz
Mode 13: 1024x768 @ 60Hz
Mode 14: 800x600 @ 60Hz
Mode 15: 720x576 @ 50Hz
Mode 16: 720x576 @ 50Hz
Mode 17: 720x576 @ 50Hz
Mode 18: 720x576i @ 50Hz
Mode 19: 720x576i @ 50Hz
Mode 20: 720x480 @ 60Hz
Mode 21: 720x480 @ 60Hz
Mode 22: 720x480 @ 60Hz
Mode 23: 720x480 @ 60Hz
Mode 24: 720x480 @ 60Hz
Mode 25: 720x480i @ 60Hz
Mode 26: 720x480i @ 60Hz
Mode 27: 720x480i @ 60Hz
Mode 28: 720x480i @ 60Hz
Mode 29: 640x480 @ 60Hz
Mode 30: 640x480 @ 60Hz
Mode 31: 640x480 @ 60Hz
2000/01/01 12:45:59.074 !INFO [BindTo][0088]BindTo_CHN:-1
2000/01/01 12:45:59.074 !INFO [BindTo][0093]m_prev_module_chn:0
Press 'q' to Exit !
2000/01/01 12:45:59.088 !INFO [SetImageFrame][0495]N2D init done!
Created new framebuffer: fb_id=75 for dma_buf_fd=59
add mapping dma_buf_fd:59 fb_id:75, mapping_count: 1
Created new framebuffer: fb_id=79 for dma_buf_fd=60
add mapping dma_buf_fd:60 fb_id:79, mapping_count: 2
详细是介绍
示例程序参数选项说明
我们可以直接执行目标文件来确认参数选项说明
root@ubuntu:/app/cdev_demo/vio2display# ./vio2display
Usage: vio2display [OPTION...]
vio(sensors) display sample -- An example of display sensor's image
-h, --height=height sensor output height
-w, --width=width sensor output width
-?, --help Give this help list
--usage Give a short usage message
Mandatory or optional arguments to long options are also mandatory or optional
for any corresponding short options.
其中
-h 是必填选项，代表输入视频的像素高度
-w 是必填选项，代表输入视频的像素宽度
-i 是必填选项，代表输入视频的文件路径
软件架构说明
本示例主要是从摄像头捕获 YUV 和 RAW 图，逻辑相对简单，打开摄像头之后，调用 libspcdev 库提供的接口之后，可以直接获取到 YUV 和 RAW 图进行保存。
API 流程说明
