Camera(一):查看Camera设备详细信息

一.查看是否存在camera外设,设备节点

ls /dev/video*

 二.adb 查看camera 详细信息　

2.1.adb shell dumpsys media.camera

2.2.adb 查看camera 过滤信息
查看某一项参数,使用过滤命令grep(linux), windows下可使用findstr来过滤
dumpsys media.camera |grep picture-size
        //Camera preview 相关信息
        picture-size: 1920x1080
        picture-size-values: 640x480,1920x1080,1600x1080,1280x720,640x360,352x288,176x144,160x120,848x480,320x240

2.3.adb 保存camera信息
adb shell dumpsys media.camera > C:\Users\Administrator\Desktop\camera.txt

 

adb shell dumpsys media.camera

Camera module HAL API version: 0x3
Camera module API version: 0x1
Camera module name: RK29_ICS_CameraHal_Module
Camera module author: RockChip
Number of camera devices: 1  //Camera个数 双目:2  单个:1  识别不到:0

Vendor tags left unimplemented.
Camera 0 static information:
  Facing: BACK
  Orientation: 0            //Camera预览方向:对应设置里面的“摄像头方向”,这里相当于读取
  Device version: 0x100
  Device is open. Client instance dump:
Client[0] (0xb86d2b18) PID: 1360
Latest set parameters:
CameraParameters::dump: mMap.size = 50
        antibanding: off
        antibanding-values: off,50hz,60hz,auto
        exposure-compensation: 0
        exposure-compensation-step: 1
        focal-length: 35
        focus-distances: 0.3,50,Infinity
        focus-mode: fixed
        focus-mode-values: fixed
        horizontal-view-angle: 10
        jpeg-quality: 90
        jpeg-thumbnail-height: 128
        jpeg-thumbnail-quality: 50
        jpeg-thumbnail-size-values: 0x0,160x128
        jpeg-thumbnail-width: 160
        max-exposure-compensation: 3
        max-num-detected-faces-hw: 0
        max-num-detected-faces-sw: 0
        max-num-focus-areas: 0
        max-num-metering-areas: 0
        max-zoom: 40
        min-exposure-compensation: -3
        picture-format: jpeg             //Camera preview 相关信息           
        picture-format-values: jpeg                    
        picture-size: 1920x1080　　　　　　//预览分辨率
        picture-size-values: 640x480,1920x1080,1600x1080,1280x720,640x360,352x288,176x144,160x120,848x480,320x240
        preferred-preview-size-for-video: 1280x720
        preview-format: yuv420sp
        preview-format-values: yuv420sp,yuv420p
        preview-fps-range: 10000,15000
        preview-fps-range-values: (10000,15000)
        preview-frame-rate: 15
        preview-frame-rate-values: 15,10
        preview-size: 1920x1080
        preview-size-values: 640x480,1920x1080,1600x1080,1280x720,640x360,352x288,176x144,160x120,848x480,320x240
        recording-hint: false
        rk-continous-pic-num: 1
        rk-previwe-h-force: 0
        rk-previwe-w-force: 0
        rotation: 0
        vertical-view-angle: 10
        video-frame-format: yuv420sp
        video-size: 1280x720
        video-size-values: 176x144,320x240,352x288,640x480,1280x720,1920x1080
        video-snapshot-supported: true
        video-stabilization-supported: false
        whitebalance: auto
        whitebalance-values: auto,incandescent,fluorescent,daylight,cloudy-daylight
        zoom: 0
        zoom-ratios: 100,105,110,115,120,125,130,135,140,145,150,155,160,165,170,175,180,185,190,195,200,205,210,215,220,225,230,235,240,245,250,255,260,265,270,275,280,285,290,295,300,
        zoom-supported: true



Camera traces (0):
  No camera traces collected.

 

二.Camera Hardware 一些常见的问题

1.1. 多个摄像头带宽限制  cameraStream(543): VIDIOC_STREAMON Failed ,err: No space left on device

01-06 18:04:44.534   244  1521 D CameraHal: cameraSetSize(514): cameraSetSize(514):IN, w = 640,h = 480
01-06 18:04:44.552   244  1521 D CameraHal: cameraStream(536): cameraStream(536):on = 1
01-06 18:04:45.100   244  1521 E CameraHal: cameraStream(543): cameraStream(543): VIDIOC_STREAMON Failed ,err: No space left on device
01-06 18:04:45.100   244  1521 D CameraHal: startPreview(255): startPreview(255):OUT
01-06 18:04:45.102   244  1521 D CameraHal: commandThread(1013): commandThread(1013): CMD_PREVIEW_START out
01-06 18:04:45.102   244  1521 D CameraHal: commandThread(1045): commandThread(1045):receive CMD_SET_PREVIEW_WINDOW

1.2.摄像头协议错误  usb线材可能有问题 cameraStream(543): VIDIOC_STREAMON Failed ,err: Protocol error