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Android camera2 判断相机功能是否可控

2016-07-16 17:10:25阅读(1442)

Android camera2 可调功能适配

首先获取到设备等级:

Float hardwareLevel = mCameraCharacteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);

LEGACY < LIMITED < FULL < LEVEL_3. 越靠右边权限越大

INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY = 2 INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED = 0 INFO_SUPPORTED_HARDWARE_LEVEL_FULL = 1 INFO_SUPPORTED_HARDWARE_LEVEL_3 = 3

在相应的等级下面会有各自支持的功能,LEGACY为最低权限
在LIMITED中

 Additional capabilities may optionally be supported by a LIMITED-level device, and can be  checked for in *android.request.availableCapabilities*.

android.request.availableCapabilities
介绍:List of capabilities that this camera device advertises as fully supporting.
int[] ints = mCameraCharacteristics.get(CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES);

Possible values:

BACKWARD_COMPATIBLE MANUAL_SENSOR MANUAL_POST_PROCESSING RAW PRIVATE_REPROCESSING READ_SENSOR_SETTINGS BURST_CAPTURE YUV_REPROCESSING DEPTH_OUTPUT CONSTRAINED_HIGH_SPEED_VIDEO

For example manual_semsor:REQUEST_AVAILABLE_CAPABILITIES_MANUAL_SENSOR
The camera device can be manually controlled (3A algorithms such as auto-exposure, and auto-focus can be bypassed). The camera device supports basic manual control of the sensor image acquisition related stages. This means the following controls are guaranteed to be supported:
Manual frame duration control
- android.sensor.frameDuration
- android.sensor.info.maxFrameDuration
Manual exposure control
- android.sensor.exposureTime
- android.sensor.info.exposureTimeRange
Manual sensitivity control
- android.sensor.sensitivity
- android.sensor.info.sensitivityRange
Manual lens control (if the lens is adjustable)
- android.lens.*
Manual flash control (if a flash unit is present)
- android.flash.*
Manual black level locking
- android.blackLevel.lock
Auto exposure lock
- android.control.aeLock
这些值对应的特征值举例:
final String name3 = CaptureRequest.SENSOR_FRAME_DURATION.getName();
name3 -》android.sensor.frameDuration
列出这个的意思是,如果想知道该设备是否支持此功能,可以通过getName()获取其包名,然后在
mCameraCharacteristics.getAvailableCaptureRequestKeys();生成的队列中寻找。
如果有匹配则是可控;

CaptureRequest.LENS_FOCUS_DISTANCE;调节焦距
CaptureRequest.CONTROL_AF_MODE;自动对焦模式
CaptureRequest.SENSOR_SENSITIVITY 调节iso
CaptureRequest.CONTROL_AE_MODE 自动曝光模式

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