Android Camera HAL3.0 Properties

Table of Contents

Properties

Property Name Type Description Units Range Notes Tags
colorCorrection
controls
Property Name Type Description Units Range Notes Tags
android.colorCorrection.mode byte [public]
  • TRANSFORM_MATRIX Use the android.colorCorrection.transform matrix and android.colorCorrection.gains to do color conversion
  • FAST Must not slow down frame rate relative to raw bayer output
  • HIGH_QUALITY Frame rate may be reduced by high quality
android.colorCorrection.transform rational x 3 x 3 [public]
3x3 rational matrix in row-major order
 A color transform matrix to use to transform from sensor RGB color space to output linear sRGB color space Output values are expected to be in the range (0,1) This matrix is either set by HAL when the request android.colorCorrection.mode is not TRANSFORM_MATRIX, or directly by the application in the request when the androird.colorCorrection.mode is TRANSFORM_MATRIX. In the latter case, the HAL may round the matrix to account for precision issues; the final rounded matrix should be reported back in this matrix result metadata.
android.colorCorrection.gains float x 4 [public]
A 1D array of floats for 4 color channel gains
 Gains applying to Bayer color channels for white-balance The 4-channel white-balance gains are defined in the order of [R G_even G_odd B], where G_even is the gain for green pixels on even rows of the output, and G_odd is the gain for greenpixels on the odd rows. if a HAL does not support a separate gain for even/odd green channels, it should use the G_even value,and write G_odd equal to G_even in the output result metadata.

The ouput should be the gains actually applied by the HAL to the current frame.
dynamic
Property Name Type Description Units Range Notes Tags
android.colorCorrection.transform rational x 3 x 3 [public]
3x3 rational matrix in row-major order
 A color transform matrix to use to transform from sensor RGB color space to output linear sRGB color space Output values are expected to be in the range (0,1) This matrix is either set by HAL when the request android.colorCorrection.mode is not TRANSFORM_MATRIX, or directly by the application in the request when the androird.colorCorrection.mode is TRANSFORM_MATRIX. In the latter case, the HAL may round the matrix to account for precision issues; the final rounded matrix should be reported back in this matrix result metadata.
android.colorCorrection.gains float x 4 [public]
A 1D array of floats for 4 color channel gains
 Gains applying to Bayer color channels for white-balance The 4-channel white-balance gains are defined in the order of [R G_even G_odd B], where G_even is the gain for green pixels on even rows of the output, and G_odd is the gain for greenpixels on the odd rows. if a HAL does not support a separate gain for even/odd green channels, it should use the G_even value,and write G_odd equal to G_even in the output result metadata.

The ouput should be the gains actually applied by the HAL to the current frame.
control
controls
Property Name Type Description Units Range Notes Tags
android.control.aeAntibandingMode byte [public]
  • OFF
  • 50HZ
  • 60HZ
  • AUTO
Enum for controlling antibanding android.control.aeAvailableAntibandingModes
android.control.aeExposureCompensation int32 [public] Adjustment to AE target image brightness count of positive/negative EV steps For example, if EV step is 0.333, '6' will mean an exposure compensation of +2 EV; -3 will mean an exposure compensation of -1
android.control.aeLock byte [public as boolean]
  • OFF Autoexposure lock is disabled; the AE algorithm is free to update its parameters.
  • ON Autoexposure lock is enabled; the AE algorithm must not update the exposure and sensitivity parameters while the lock is active
Whether AE is currently locked to its latest calculated values Note that even when AE is locked, the flash may be fired if the AE mode is ON_AUTO_FLASH / ON_ALWAYS_FLASH / ON_AUTO_FLASH_REDEYE.
android.control.aeMode byte [public]
  • OFF Autoexposure is disabled; sensor.exposureTime, sensor.sensitivity and sensor.frameDuration are used
  • ON Autoexposure is active, no flash control
  • ON_AUTO_FLASH if flash exists Autoexposure is active, auto flash control; flash may be fired when precapture trigger is activated, and for captures for which captureIntent = STILL_CAPTURE
  • ON_ALWAYS_FLASH if flash exists Autoexposure is active, auto flash control for precapture trigger and always flash when captureIntent = STILL_CAPTURE
  • ON_AUTO_FLASH_REDEYE optional Automatic red eye reduction with flash. If deemed necessary, red eye reduction sequence should fire when precapture trigger is activated, and final flash should fire when captureIntent = STILL_CAPTURE
Whether AE is currently updating the sensor exposure and sensitivity fields android.control.aeAvailableModes Only effective if android.control.mode = AUTO
android.control.aeRegions int32 x 5 x area_count [public] List of areas to use for metering Each area is a rectangle plus weight: xmin, ymin, xmax, ymax, weight.

The coordinate system is based on the active pixel array, with (0,0) being the top-left of the active pixel array, and (android.sensor.info.activeArraySize.width, android.sensor.info.activeArraySize.height) being the bottom-right point of the active pixel array. The weight should be nonnegative.

If all regions have 0 weight, then no specific metering area needs to be used by the HAL. If the metering region is outside the current android.scaler.cropRegion, the HAL should ignore the sections outside the region and output the used sections in the frame metadata
android.control.aeTargetFpsRange int32 x 2 [public] Range over which fps can be adjusted to maintain exposure android.control.aeAvailableTargetFpsRanges Only constrains AE algorithm, not manual control of android.sensor.exposureTime
android.control.aePrecaptureTrigger byte [public]
  • IDLE The trigger is idle.
  • START The precapture metering sequence must be started. The exact effect of the precapture trigger depends on the current AE mode and state.
Whether the HAL must trigger precapture metering. This entry is normally set to IDLE, or is not included at all in the request settings. When included and set to START, the HAL must trigger the autoexposure precapture metering sequence.

The effect of AE precapture trigger depends on the current AE mode and state; see the camera HAL device v3 header for details.
android.control.afMode byte [public]
  • OFF The 3A routines do not control the lens; android.lens.focusDistance is controlled by the application
  • AUTO if lens is not fixed focus. Use android.lens.minimumFocusDistance to determine if lens is fixed focus In this mode, the lens does not move unless the autofocus trigger action is called. When that trigger is activated, AF must transition to ACTIVE_SCAN, then to the outcome of the scan (FOCUSED or NOT_FOCUSED). Triggering cancel AF resets the lens position to default, and sets the AF state to INACTIVE.
  • MACRO In this mode, the lens does not move unless the autofocus trigger action is called. When that trigger is activated, AF must transition to ACTIVE_SCAN, then to the outcome of the scan (FOCUSED or NOT_FOCUSED). Triggering cancel AF resets the lens position to default, and sets the AF state to INACTIVE.
  • CONTINUOUS_VIDEO In this mode, the AF algorithm modifies the lens position continually to attempt to provide a constantly-in-focus image stream. The focusing behavior should be suitable for good quality video recording; typically this means slower focus movement and no overshoots. When the AF trigger is not involved, the AF algorithm should start in INACTIVE state, and then transition into PASSIVE_SCAN and PASSIVE_FOCUSED states as appropriate. When the AF trigger is activated, the algorithm should immediately transition into AF_FOCUSED or AF_NOT_FOCUSED as appropriate, and lock the lens position until a cancel AF trigger is received. Once cancel is received, the algorithm should transition back to INACTIVE and resume passive scan. Note that this behavior is not identical to CONTINUOUS_PICTURE, since an ongoing PASSIVE_SCAN must immediately be canceled.
  • CONTINUOUS_PICTURE In this mode, the AF algorithm modifies the lens position continually to attempt to provide a constantly-in-focus image stream. The focusing behavior should be suitable for still image capture; typically this means focusing as fast as possible. When the AF trigger is not involved, the AF algorithm should start in INACTIVE state, and then transition into PASSIVE_SCAN and PASSIVE_FOCUSED states as appropriate as it attempts to maintain focus. When the AF trigger is activated, the algorithm should finish its PASSIVE_SCAN if active, and then transition into AF_FOCUSED or AF_NOT_FOCUSED as appropriate, and lock the lens position until a cancel AF trigger is received. When the AF cancel trigger is activated, the algorithm should transition back to INACTIVE and then act as if it has just been started.
  • EDOF Extended depth of field (digital focus). AF trigger is ignored, AF state should always be INACTIVE.
Whether AF is currently enabled, and what mode it is set to
android.control.afRegions int32 x 5 x area_count [public] List of areas to use for focus estimation Each area is a rectangle plus weight: xmin, ymin, xmax, ymax, weight.

The coordinate system is based on the active pixel array, with (0,0) being the top-left of the active pixel array, and (android.sensor.info.activeArraySize.width, android.sensor.info.activeArraySize.height) being the bottom-right point of the active pixel array. The weight should be nonnegative.

If all regions have 0 weight, then no specific focus area needs to be used by the HAL. If the focusing region is outside the current android.scaler.cropRegion, the HAL should ignore the sections outside the region and output the used sections in the frame metadata
android.control.afTrigger byte [public]
  • IDLE The trigger is idle.
  • START Autofocus must trigger now.
  • CANCEL Autofocus must return to initial state, and cancel any active trigger.
Whether the HAL must trigger autofocus. This entry is normally set to IDLE, or is not included at all in the request settings.

When included and set to START, the HAL must trigger the autofocus algorithm. The effect of AF trigger depends on the current AF mode and state; see the camera HAL device v3 header for details. When set to CANCEL, the HAL must cancel any active trigger, and return to initial AF state.
android.control.awbLock byte [public as boolean]
  • OFF Auto-whitebalance lock is disabled; the AWB algorithm is free to update its parameters if in AUTO mode.
  • ON Auto-whitebalance lock is enabled; the AWB algorithm must not update the exposure and sensitivity parameters while the lock is active
Whether AWB is currently locked to its latest calculated values Note that AWB lock is only meaningful for AUTO mode; in other modes, AWB is already fixed to a specific setting
android.control.awbMode byte [public]
  • OFF
  • AUTO
  • INCANDESCENT
  • FLUORESCENT
  • WARM_FLUORESCENT
  • DAYLIGHT
  • CLOUDY_DAYLIGHT
  • TWILIGHT
  • SHADE
Whether AWB is currently setting the color transform fields, and what its illumination target is [BC - AWB lock,AWB modes]
android.control.awbRegions int32 x 5 x area_count [public] List of areas to use for illuminant estimation Only used in AUTO mode.

Each area is a rectangle plus weight: xmin, ymin, xmax, ymax, weight. The coordinate system is based on the active pixel array, with (0,0) being the top-left of the active pixel array, and (android.sensor.info.activeArraySize.width, android.sensor.info.activeArraySize.height) being the bottom-right point of the active pixel array. The weight should be nonnegative.

If all regions have 0 weight, then no specific metering area needs to be used by the HAL. If the metering region is outside the current android.scaler.cropRegion, the HAL should ignore the sections outside the region and output the used sections in the frame metadata
android.control.captureIntent byte [public]
  • CUSTOM This request doesn't fall into the other categories. Default to preview-like behavior.
  • PREVIEW This request is for a preview-like usecase. The precapture trigger may be used to start off a metering w/flash sequence
  • STILL_CAPTURE This request is for a still capture-type usecase.
  • VIDEO_RECORD This request is for a video recording usecase.
  • VIDEO_SNAPSHOT This request is for a video snapshot (still image while recording video) usecase
  • ZERO_SHUTTER_LAG This request is for a ZSL usecase; the application will stream full-resolution images and reprocess one or several later for a final capture
Information to 3A routines about the purpose of this capture, to help decide optimal 3A strategy all must be supported Only used if android.control.mode != OFF.
android.control.effectMode byte [public]
  • OFF
  • MONO optional
  • NEGATIVE optional
  • SOLARIZE optional
  • SEPIA optional
  • POSTERIZE optional
  • WHITEBOARD optional
  • BLACKBOARD optional
  • AQUA optional
Whether any special color effect is in use. Only used if android.control.mode != OFF android.control.availableEffects
android.control.mode byte [public]
  • OFF Full application control of pipeline. All 3A routines are disabled, no other settings in android.control.* have any effect
  • AUTO Use settings for each individual 3A routine. Manual control of capture parameters is disabled. All controls in android.control.* besides sceneMode take effect
  • USE_SCENE_MODE Use specific scene mode. Enabling this disables control.aeMode, control.awbMode and control.afMode controls; the HAL must ignore those settings while USE_SCENE_MODE is active (except for FACE_PRIORITY scene mode). Other control entries are still active. This setting can only be used if availableSceneModes != UNSUPPORTED
Overall mode of 3A control routines all must be supported
android.control.sceneMode byte [public]
  • UNSUPPORTED 0
  • FACE_PRIORITY if face detection support exists Use face detection data to drive 3A routines. If face detection statistics are disabled, should still operate correctly (but not return face detection statistics to the framework). Unlike the other scene modes, aeMode, awbMode, and afMode remain active when FACE_PRIORITY is set. This is due to compatibility concerns with the old camera API
  • ACTION optional
  • PORTRAIT optional
  • LANDSCAPE optional
  • NIGHT optional
  • NIGHT_PORTRAIT optional
  • THEATRE optional
  • BEACH optional
  • SNOW optional
  • SUNSET optional
  • STEADYPHOTO optional
  • FIREWORKS optional
  • SPORTS optional
  • PARTY optional
  • CANDLELIGHT optional
  • BARCODE optional
Which scene mode is active when android.control.mode = SCENE_MODE android.control.availableSceneModes
android.control.videoStabilizationMode byte [public as boolean]
  • OFF
  • ON
Whether video stabilization is active If enabled, video stabilization can modify the android.scaler.cropRegion to keep the video stream stabilized
static
Property Name Type Description Units Range Notes Tags
android.control.aeAvailableAntibandingModes byte x n [public]
list of enums
 Which set of antibanding modes are supported
android.control.aeAvailableModes byte x n [system]
list of enums
 Which subset of AE modes is supported OFF, ON must be supported. ON_AUTO_FLASH/ON_ALWAYS_FLASH must be supported if flash unit is available
android.control.aeAvailableTargetFpsRanges int32 x 2 x n [public]
list of pairs of frame rates
 List of frame rate ranges supported by the AE algorithm/hardware
android.control.aeCompensationRange int32 x 2 [public] Maximum and minimum exposure compensation setting, in counts of android.control.aeCompensationStepSize At least (-2,2)/(exp compensation step size)
android.control.aeCompensationStep rational [public] Smallest step by which exposure compensation can be changed <= 1/2
android.control.afAvailableModes byte x n [public]
List of enums
 List of AF modes that can be selected OFF must be included. AUTO must be supported if lens allows for changing focus
android.control.availableEffects byte x n [public]
list of enums
 what subset of the full color effect enum list is supported OFF must be listed
android.control.availableSceneModes byte x n [public]
list of enums from android.control.sceneMode, plus UNSUPPORTED to indicate no scene modes are supported
 what subset of the scene mode enum list is supported. SCENE_MODE_FACE_PRIORITY must be supported if face detection is supported
android.control.availableVideoStabilizationModes byte x n [public]
List of enums.
 List of video stabilization modes that can be supported OFF must be included
android.control.awbAvailableModes byte x n [public]
List of enums (android.control.awbMode)
 OFF, AUTO must be included
android.control.maxRegions int32 [public] For AE, AWB, and AF, how many individual regions can be listed for metering? >= 1
android.control.sceneModeOverrides byte x 3 x length(availableSceneModes) [system] List of AE, AWB, and AF modes to use for each available scene mode For each listed scene mode, lists the aeMode, awbMode, and afMode that the HAL wants to use for that scene mode. For each entry, the order is {aeMode, awbMode, afMode} in order of increasing index When a scene mode is enabled, the HAL is expected to override aeMode, awbMode, and afMode with its preferred settings for that scene mode.

To simplify communication with old camera API applications, the service wants this override list in the static metadata. The order of this list matches that of availableSceneModes, with 3 entires for each scene mode. The overrides listed for SCENE_MODE_FACE_PRIORITY are ignored, since for that mode, the application-set aeMode, awbMode, and afMode are used instead, like they are when android.control.mode is AUTO.

It is recommended that for FACE_PRIORITY, the overrides should be set to 0. As an example, if availableSceneModes is { FACE_PRIORITY, ACTION, NIGHT }, then the service expects this field to have 9 entries; for example { 0 , 0, 0, ON_AUTO_FLASH, AUTO, CONTINUOUS_PICTURE, ON_AUTO_FLASH, INCANDESCENT, AUTO }
dynamic
Property Name Type Description Units Range Notes Tags
android.control.aePrecaptureId int32 [hidden] The ID sent with the latest CAMERA2_TRIGGER_PRECAPTURE_METERING call Must be 0 if no CAMERA2_TRIGGER_PRECAPTURE_METERING trigger received yet by HAL. Always updated even if AE algorithm ignores the trigger
android.control.aeRegions int32 x 5 x area_count [public] List of areas to use for metering Each area is a rectangle plus weight: xmin, ymin, xmax, ymax, weight.

The coordinate system is based on the active pixel array, with (0,0) being the top-left of the active pixel array, and (android.sensor.info.activeArraySize.width, android.sensor.info.activeArraySize.height) being the bottom-right point of the active pixel array. The weight should be nonnegative.

If all regions have 0 weight, then no specific metering area needs to be used by the HAL. If the metering region is outside the current android.scaler.cropRegion, the HAL should ignore the sections outside the region and output the used sections in the frame metadata
android.control.aeState byte [public]
  • INACTIVE AE is off. When a camera device is opened, it starts in this state.
  • SEARCHING AE doesn't yet have a good set of control values for the current scene
  • CONVERGED AE has a good set of control values for the current scene
  • LOCKED AE has been locked (aeMode = LOCKED)
  • FLASH_REQUIRED AE has a good set of control values, but flash needs to be fired for good quality still capture
  • PRECAPTURE AE has been asked to do a precapture sequence (through the trigger_action(CAMERA2_TRIGGER_PRECAPTURE_METERING) call), and is currently executing it. Once PRECAPTURE completes, AE will transition to CONVERGED or FLASH_REQUIRED as appropriate
Current state of AE algorithm Whenever the AE algorithm state changes, a MSG_AUTOEXPOSURE notification must be send if a notification callback is registered.
android.control.afMode byte [public]
  • OFF The 3A routines do not control the lens; android.lens.focusDistance is controlled by the application
  • AUTO if lens is not fixed focus. Use android.lens.minimumFocusDistance to determine if lens is fixed focus In this mode, the lens does not move unless the autofocus trigger action is called. When that trigger is activated, AF must transition to ACTIVE_SCAN, then to the outcome of the scan (FOCUSED or NOT_FOCUSED). Triggering cancel AF resets the lens position to default, and sets the AF state to INACTIVE.
  • MACRO In this mode, the lens does not move unless the autofocus trigger action is called. When that trigger is activated, AF must transition to ACTIVE_SCAN, then to the outcome of the scan (FOCUSED or NOT_FOCUSED). Triggering cancel AF resets the lens position to default, and sets the AF state to INACTIVE.
  • CONTINUOUS_VIDEO In this mode, the AF algorithm modifies the lens position continually to attempt to provide a constantly-in-focus image stream. The focusing behavior should be suitable for good quality video recording; typically this means slower focus movement and no overshoots. When the AF trigger is not involved, the AF algorithm should start in INACTIVE state, and then transition into PASSIVE_SCAN and PASSIVE_FOCUSED states as appropriate. When the AF trigger is activated, the algorithm should immediately transition into AF_FOCUSED or AF_NOT_FOCUSED as appropriate, and lock the lens position until a cancel AF trigger is received. Once cancel is received, the algorithm should transition back to INACTIVE and resume passive scan. Note that this behavior is not identical to CONTINUOUS_PICTURE, since an ongoing PASSIVE_SCAN must immediately be canceled.
  • CONTINUOUS_PICTURE In this mode, the AF algorithm modifies the lens position continually to attempt to provide a constantly-in-focus image stream. The focusing behavior should be suitable for still image capture; typically this means focusing as fast as possible. When the AF trigger is not involved, the AF algorithm should start in INACTIVE state, and then transition into PASSIVE_SCAN and PASSIVE_FOCUSED states as appropriate as it attempts to maintain focus. When the AF trigger is activated, the algorithm should finish its PASSIVE_SCAN if active, and then transition into AF_FOCUSED or AF_NOT_FOCUSED as appropriate, and lock the lens position until a cancel AF trigger is received. When the AF cancel trigger is activated, the algorithm should transition back to INACTIVE and then act as if it has just been started.
  • EDOF Extended depth of field (digital focus). AF trigger is ignored, AF state should always be INACTIVE.
Whether AF is currently enabled, and what mode it is set to
android.control.afRegions int32 x 5 x area_count [public] List of areas to use for focus estimation Each area is a rectangle plus weight: xmin, ymin, xmax, ymax, weight.

The coordinate system is based on the active pixel array, with (0,0) being the top-left of the active pixel array, and (android.sensor.info.activeArraySize.width, android.sensor.info.activeArraySize.height) being the bottom-right point of the active pixel array. The weight should be nonnegative.

If all regions have 0 weight, then no specific focus area needs to be used by the HAL. If the focusing region is outside the current android.scaler.cropRegion, the HAL should ignore the sections outside the region and output the used sections in the frame metadata
android.control.afState byte [public]
  • INACTIVE AF off or has not yet tried to scan/been asked to scan. When a camera device is opened, it starts in this state.
  • PASSIVE_SCAN if CONTINUOUS_* modes are supported AF is currently doing an AF scan initiated by a continuous autofocus mode
  • PASSIVE_FOCUSED if CONTINUOUS_* modes are supported AF currently believes it is in focus, but may restart scanning at any time.
  • ACTIVE_SCAN if AUTO or MACRO modes are supported AF is doing an AF scan because it was triggered by AF trigger
  • FOCUSED_LOCKED if any AF mode besides OFF is supported AF believes it is focused correctly and is locked
  • NOT_FOCUSED_LOCKED if any AF mode besides OFF is supported AF has failed to focus successfully and is locked
Current state of AF algorithm Whenever the AF algorithm state changes, a MSG_AUTOFOCUS notification must be send if a notification callback is registered.
android.control.afTriggerId int32 [hidden] The ID sent with the latest CAMERA2_TRIGGER_AUTOFOCUS call Must be 0 if no CAMERA2_TRIGGER_AUTOFOCUS trigger received yet by HAL. Always updated even if AF algorithm ignores the trigger
android.control.awbMode byte [public]
  • OFF
  • AUTO
  • INCANDESCENT
  • FLUORESCENT
  • WARM_FLUORESCENT
  • DAYLIGHT
  • CLOUDY_DAYLIGHT
  • TWILIGHT
  • SHADE
Whether AWB is currently setting the color transform fields, and what its illumination target is [BC - AWB lock,AWB modes]
android.control.awbRegions int32 x 5 x area_count [public] List of areas to use for illuminant estimation Only used in AUTO mode.

Each area is a rectangle plus weight: xmin, ymin, xmax, ymax, weight. The coordinate system is based on the active pixel array, with (0,0) being the top-left of the active pixel array, and (android.sensor.info.activeArraySize.width, android.sensor.info.activeArraySize.height) being the bottom-right point of the active pixel array. The weight should be nonnegative.

If all regions have 0 weight, then no specific metering area needs to be used by the HAL. If the metering region is outside the current android.scaler.cropRegion, the HAL should ignore the sections outside the region and output the used sections in the frame metadata
android.control.awbState byte [public]
  • INACTIVE AWB is not in auto mode. When a camera device is opened, it starts in this state.
  • SEARCHING AWB doesn't yet have a good set of control values for the current scene
  • CONVERGED AWB has a good set of control values for the current scene
  • LOCKED AE has been locked (aeMode = LOCKED)
Current state of AWB algorithm Whenever the AWB algorithm state changes, a MSG_AUTOWHITEBALANCE notification must be send if a notification callback is registered.
android.control.mode byte [public]
  • OFF Full application control of pipeline. All 3A routines are disabled, no other settings in android.control.* have any effect
  • AUTO Use settings for each individual 3A routine. Manual control of capture parameters is disabled. All controls in android.control.* besides sceneMode take effect
  • USE_SCENE_MODE Use specific scene mode. Enabling this disables control.aeMode, control.awbMode and control.afMode controls; the HAL must ignore those settings while USE_SCENE_MODE is active (except for FACE_PRIORITY scene mode). Other control entries are still active. This setting can only be used if availableSceneModes != UNSUPPORTED
Overall mode of 3A control routines all must be supported
demosaic
controls
Property Name Type Description Units Range Notes Tags
android.demosaic.mode byte [system]
  • FAST Minimal or no slowdown of frame rate compared to Bayer RAW output
  • HIGH_QUALITY High-quality may reduce output frame rate
Controls the quality of the demosaicing processing
edge
controls
Property Name Type Description Units Range Notes Tags
android.edge.mode byte [public]
  • OFF No edge enhancement is applied
  • FAST Must not slow down frame rate relative to raw bayer output
  • HIGH_QUALITY Frame rate may be reduced by high quality
Operation mode for edge enhancement
android.edge.strength byte [system] Control the amount of edge enhancement applied to the images 1-10; 10 is maximum sharpening
dynamic
Property Name Type Description Units Range Notes Tags
android.edge.mode byte [public]
  • OFF No edge enhancement is applied
  • FAST Must not slow down frame rate relative to raw bayer output
  • HIGH_QUALITY Frame rate may be reduced by high quality
Operation mode for edge enhancement
flash
controls
Property Name Type Description Units Range Notes Tags
android.flash.firingPower byte [system] Power for flash firing/torch 10 is max power; 0 is no flash. Linear 0 - 10 Power for snapshot may use a different scale than for torch mode. Only one entry for torch mode will be used
android.flash.firingTime int64 [system] Firing time of flash relative to start of exposure nanoseconds 0-(exposure time-flash duration) Clamped to (0, exposure time - flash duration).
android.flash.mode byte [public]
  • OFF Do not fire the flash for this capture
  • SINGLE if android.flash.available is true Fire flash for this capture based on firingPower, firingTime.
  • TORCH if android.flash.available is true Flash continuously on, power set by firingPower
Select flash operation mode
static
Property Name Type Description Units Range Notes Tags
android.flash.info.available byte [public] Whether this camera has a flash boolean (0 = false, otherwise true) If no flash, none of the flash controls do anything. All other metadata should return 0
android.flash.info.chargeDuration int64 [system] Time taken before flash can fire again nanoseconds 0-1e9 1 second too long/too short for recharge? Should this be power-dependent?
android.flash.colorTemperature byte [system] The x,y whitepoint of the flash pair of floats 0-1 for both
android.flash.maxEnergy byte [system] Max energy output of the flash for a full power single flash lumen-seconds >= 0
dynamic
Property Name Type Description Units Range Notes Tags
android.flash.firingPower byte [system] Power for flash firing/torch 10 is max power; 0 is no flash. Linear 0 - 10 Power for snapshot may use a different scale than for torch mode. Only one entry for torch mode will be used
android.flash.firingTime int64 [system] Firing time of flash relative to start of exposure nanoseconds 0-(exposure time-flash duration) Clamped to (0, exposure time - flash duration).
android.flash.mode byte [public]
  • OFF Do not fire the flash for this capture
  • SINGLE if android.flash.available is true Fire flash for this capture based on firingPower, firingTime.
  • TORCH if android.flash.available is true Flash continuously on, power set by firingPower
Select flash operation mode
android.flash.state byte [public]
  • UNAVAILABLE No flash on camera
  • CHARGING if android.flash.available is true Flash is charging and cannot be fired
  • READY if android.flash.available is true Flash is ready to fire
  • FIRED if android.flash.available is true Flash fired for this capture
Current state of the flash unit
geometric
controls
Property Name Type Description Units Range Notes Tags
android.geometric.mode byte [system]
  • OFF No geometric correction is applied
  • FAST Must not slow down frame rate relative to raw bayer output
  • HIGH_QUALITY Frame rate may be reduced by high quality
Operating mode of geometric correction
android.geometric.strength byte [system] Control the amount of shading correction applied to the images unitless: 1-10; 10 is full shading compensation
hotPixel
controls
Property Name Type Description Units Range Notes Tags
android.hotPixel.mode byte [system]
  • OFF No hot pixel correction can be applied
  • FAST Frame rate must not be reduced compared to raw Bayer output
  • HIGH_QUALITY Frame rate may be reduced by high quality
Set operational mode for hot pixel correction
static
Property Name Type Description Units Range Notes Tags
android.hotPixel.info.map int32 x 2 x n [system]
list of coordinates based on android.sensor.pixelArraySize
 Location of hot/defective pixels on sensor
dynamic
Property Name Type Description Units Range Notes Tags
android.hotPixel.mode byte [system]
  • OFF No hot pixel correction can be applied
  • FAST Frame rate must not be reduced compared to raw Bayer output
  • HIGH_QUALITY Frame rate may be reduced by high quality
Set operational mode for hot pixel correction
jpeg
controls
Property Name Type Description Units Range Notes Tags
android.jpeg.gpsCoordinates double x 3 [public]
latitude, longitude, altitude. First two in degrees, the third in meters
 GPS coordinates to include in output JPEG EXIF (-180 - 180], [-90,90], [-inf, inf]
android.jpeg.gpsProcessingMethod byte [public as string] 32 characters describing GPS algorithm to include in EXIF UTF-8 null-terminated string
android.jpeg.gpsTimestamp int64 [public] Time GPS fix was made to include in EXIF UTC in seconds since January 1, 1970
android.jpeg.orientation int32 [public] Orientation of JPEG image to write Degrees in multiples of 90 0, 90, 180, 270
android.jpeg.quality byte [public] Compression quality of the final JPEG image 1-100; larger is higher quality 85-95 is typical usage range
android.jpeg.thumbnailQuality byte [public] Compression quality of JPEG thumbnail 1-100; larger is higher quality
android.jpeg.thumbnailSize int32 x 2 [public as size] Resolution of embedded JPEG thumbnail from android.jpeg.availableThumbnailSizes
static
Property Name Type Description Units Range Notes Tags
android.jpeg.availableThumbnailSizes int32 x 2 x n [public as size]
list of resolution pairs
 Supported resolutions for the JPEG thumbnail Must include at least one valid resolution, plus (0,0) for no thumbnail generation
android.jpeg.maxSize int32 [system] Maximum size in bytes for the compressed JPEG buffer Must be large enough to fit any JPEG produced by the camera This is used for sizing the gralloc buffers for JPEG
dynamic
Property Name Type Description Units Range Notes Tags
android.jpeg.gpsCoordinates double x 3 [public]
latitude, longitude, altitude. First two in degrees, the third in meters
 GPS coordinates to include in output JPEG EXIF (-180 - 180], [-90,90], [-inf, inf]
android.jpeg.gpsProcessingMethod byte [public as string] 32 characters describing GPS algorithm to include in EXIF UTF-8 null-terminated string
android.jpeg.gpsTimestamp int64 [public] Time GPS fix was made to include in EXIF UTC in seconds since January 1, 1970
android.jpeg.orientation int32 [public] Orientation of JPEG image to write Degrees in multiples of 90 0, 90, 180, 270
android.jpeg.quality byte [public] Compression quality of the final JPEG image 1-100; larger is higher quality 85-95 is typical usage range
android.jpeg.size int32 [system] The size of the compressed JPEG image, in bytes >= 0 If no JPEG output is produced for the request, this must be 0.

Otherwise, this describes the real size of the compressed JPEG image placed in the output stream. More specifically, if android.jpeg.maxSize = 1000000, and a specific capture has android.jpeg.size = 500000, then the output buffer from the JPEG stream will be 1000000 bytes, of which the first 500000 make up the real data.
android.jpeg.thumbnailQuality byte [public] Compression quality of JPEG thumbnail 1-100; larger is higher quality
android.jpeg.thumbnailSize int32 x 2 [public as size] Resolution of embedded JPEG thumbnail from android.jpeg.availableThumbnailSizes
lens
controls
Property Name Type Description Units Range Notes Tags
android.lens.aperture float [public] Size of the lens aperture f-number (f/NNN) android.lens.info.availableApertures Will not be supported on most devices. Can only pick from supported list
android.lens.filterDensity float [public] State of lens neutral density filter(s) number of stops of filtering android.lens.info.availableFilterDensities Will not be supported on most devices. Can only pick from supported list
android.lens.focalLength float [public] Lens optical zoom setting focal length in mm > 0 Will not be supported on most devices.
android.lens.focusDistance float [public] Distance to plane of sharpest focus, measured from frontmost surface of the lens diopters (1/m) >= 0 0 = infinity focus. Used value should be clamped to (0,minimum focus distance)
android.lens.opticalStabilizationMode byte [public]
  • OFF
  • ON optional
Whether optical image stabilization is enabled. android.lens.availableOpticalStabilization Will not be supported on most devices.
static
Property Name Type Description Units Range Notes Tags
android.lens.info.availableApertures float x n [public] List of supported aperture values one entry required, > 0 If variable aperture not available, only setting should be for the fixed aperture
android.lens.info.availableFilterDensities float x n [public] List of supported ND filter values one entry required, >= 0 If not available, only setting is 0. Otherwise, lists the available exposure index values for dimming (2 would mean the filter is set to reduce incoming light by two stops)
android.lens.info.availableFocalLengths float x n [public]
the list of available focal lengths
 If fitted with optical zoom, what focal lengths are available. If not, the static focal length > 0 If optical zoom not supported, only one value should be reported
android.lens.info.availableOpticalStabilization byte x n [public]
list of enums
 List of supported optical image stabilization modes
android.lens.info.geometricCorrectionMap float x 2 x 3 x n x m [system]
2D array of destination coordinate pairs for uniform grid points in source image, per color channel. Size in the range of 2x3x40x30
 A low-resolution map for correction of geometric distortions and chromatic aberrations, per color channel N, M >= 2 [DNG wants a function instead]. What's easiest for implementers? With an array size (M, N), entry (i, j) provides the destination for pixel (i/(M-1) * width, j/(N-1) * height). Data is row-major, with each array entry being ( (X, Y)_r, (X, Y)_g, (X, Y)_b ) )
android.lens.info.geometricCorrectionMapSize int32 x 2 [system as size]
width and height of geometric correction map
 Dimensions of geometric correction map Both values >= 2
android.lens.info.hyperfocalDistance float [public] Hyperfocal distance for this lens; set to 0 if fixed focus diopters >= 0 The hyperfocal distance is used for the old API's 'fixed' setting
android.lens.info.minimumFocusDistance float [public] Shortest distance from frontmost surface of the lens that can be focused correctly diopters >= 0 If the lens is fixed-focus, this should be 0
android.lens.info.shadingMapSize int32 x 2 [public as size]
width and height of lens shading map provided by the HAL. (N, M)
 Dimensions of lens shading map Both values >= 1
android.lens.facing byte [public]
  • FRONT
  • BACK
Direction the camera faces relative to device screen
android.lens.opticalAxisAngle float x 2 [system]
degrees. First defines the angle of separation between the perpendicular to the screen and the camera optical axis. The second then defines the clockwise rotation of the optical axis from native device up.
 Relative angle of camera optical axis to the perpendicular axis from the display [0-90) for first angle, [0-360) for second Examples:

(0,0) means that the camera optical axis is perpendicular to the display surface;

(45,0) means that the camera points 45 degrees up when device is held upright;

(45,90) means the camera points 45 degrees to the right when the device is held upright.

Use FACING field to determine perpendicular outgoing direction
android.lens.position float x 3, location in mm, in the sensor coordinate system [system] Coordinates of camera optical axis on device
dynamic
Property Name Type Description Units Range Notes Tags
android.lens.aperture float [public] Size of the lens aperture f-number (f/NNN) android.lens.info.availableApertures Will not be supported on most devices. Can only pick from supported list
android.lens.filterDensity float [public] State of lens neutral density filter(s) number of stops of filtering android.lens.info.availableFilterDensities Will not be supported on most devices. Can only pick from supported list
android.lens.focalLength float [public] Lens optical zoom setting focal length in mm > 0 Will not be supported on most devices.
android.lens.focusDistance float [public] Distance to plane of sharpest focus, measured from frontmost surface of the lens diopters (1/m) >= 0 Should be zero for fixed-focus cameras
android.lens.focusRange float [public] The range of scene distances that are in sharp focus (depth of field) pair of focus distances in diopters: (near, far) >=0 If variable focus not supported, can still report fixed depth of field range
android.lens.opticalStabilizationMode byte [public]
  • OFF
  • ON optional
Whether optical image stabilization is enabled. android.lens.availableOpticalStabilization Will not be supported on most devices.
android.lens.state byte [public]
  • STATIONARY
Current lens status
noiseReduction
controls
Property Name Type Description Units Range Notes Tags
android.noiseReduction.mode byte [public]
  • OFF No noise reduction is applied
  • FAST Must not slow down frame rate relative to raw bayer output
  • HIGH_QUALITY May slow down frame rate to provide highest quality
Mode of operation for the noise reduction algorithm android.noiseReduction.availableModes
android.noiseReduction.strength byte [system] Control the amount of noise reduction applied to the images 1-10; 10 is max noise reduction 1 - 10
dynamic
Property Name Type Description Units Range Notes Tags
android.noiseReduction.mode byte [public]
  • OFF No noise reduction is applied
  • FAST Must not slow down frame rate relative to raw bayer output
  • HIGH_QUALITY May slow down frame rate to provide highest quality
Mode of operation for the noise reduction algorithm android.noiseReduction.availableModes
quirks
static
Property Name Type Description Units Range Notes Tags
android.quirks.meteringCropRegion byte [system] If set to 1, the camera service does not scale 'normalized' coordinates with respect to the crop region. This applies to metering input (a{e,f,wb}Region and output (face rectangles). Normalized coordinates refer to those in the (-1000,1000) range mentioned in the android.hardware.Camera API.

HAL implementations should instead always use and emit sensor array-relative coordinates for all region data. Does not need to be listed in static metadata. Support will be removed in future versions of camera service.
android.quirks.triggerAfWithAuto byte [system] If set to 1, then the camera service always switches to FOCUS_MODE_AUTO before issuing a AF trigger. HAL implementations should implement AF trigger modes for AUTO, MACRO, CONTINUOUS_FOCUS, and CONTINUOUS_PICTURE modes instead of using this flag. Does not need to be listed in static metadata. Support will be removed in future versions of camera service
android.quirks.useZslFormat byte [system] If set to 1, the camera service uses CAMERA2_PIXEL_FORMAT_ZSL instead of HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED for the zero shutter lag stream HAL implementations should use gralloc usage flags to determine that a stream will be used for zero-shutter-lag, instead of relying on an explicit format setting. Does not need to be listed in static metadata. Support will be removed in future versions of camera service.
request
controls
Property Name Type Description Units Range Notes Tags
android.request.frameCount int32 [system] A frame counter set by the framework. Must be maintained unchanged in output frame incrementing integer Any int
android.request.id int32 [hidden] An application-specified ID for the current request. Must be maintained unchanged in output frame arbitrary integer assigned by application Any int
android.request.inputStreams byte x n [system] List which camera reprocess stream is used for the source of reprocessing data. List of camera reprocess stream IDs Typically, only one entry allowed, must be a valid reprocess stream ID. If android.jpeg.needsThumbnail is set, then multiple reprocess streams may be included in a single request; they must be different scaled versions of the same image. Only meaningful when android.request.type == REPROCESS. Ignored otherwise
android.request.metadataMode byte [system]
  • NONE No metadata should be produced on output, except for application-bound buffer data. If no application-bound streams exist, no frame should be placed in the output frame queue. If such streams exist, a frame should be placed on the output queue with null metadata but with the necessary output buffer information. Timestamp information should still be included with any output stream buffers
  • FULL All metadata should be produced. Statistics will only be produced if they are separately enabled
How much metadata to produce on output
android.request.outputStreams byte x n [system] Lists which camera output streams image data from this capture must be sent to List of camera stream IDs List must only include streams that have been created If no output streams are listed, then the image data should simply be discarded. The image data must still be captured for metadata and statistics production, and the lens and flash must operate as requested.
android.request.type byte [system]
  • CAPTURE Capture a new image from the imaging hardware, and process it according to the settings
  • REPROCESS Process previously captured data; the android.request.inputStream parameter determines the source reprocessing stream. TODO: Mark dynamic metadata needed for reprocessing with [RP]
The type of the request; either CAPTURE or REPROCESS. For HAL3, this tag is redundant.
static
Property Name Type Description Units Range Notes Tags
android.request.maxNumOutputStreams int32 x 3 [public] How many output streams can be allocated at the same time for each type of stream The number of raw sensor streams; the number of processed, uncompressed streams; and the number of JPEG-compressed streams >=1 for Raw and JPEG-compressed stream. >= 3 for processed, uncompressed streams Video snapshot with preview callbacks requires 3 processed streams (preview, record, app callbacks) and one JPEG stream (snapshot)
android.request.maxNumReprocessStreams int32 x 1 [system] How many reprocessing streams of any type can be allocated at the same time >= 1
dynamic
Property Name Type Description Units Range Notes Tags
android.request.frameCount int32 [public] Number of frames captured since open() count of frames > 0 Reset on release()
android.request.id int32 [hidden] An application-specified ID for the current request. Must be maintained unchanged in output frame arbitrary integer assigned by application Any int
android.request.metadataMode byte [system]
  • NONE No metadata should be produced on output, except for application-bound buffer data. If no application-bound streams exist, no frame should be placed in the output frame queue. If such streams exist, a frame should be placed on the output queue with null metadata but with the necessary output buffer information. Timestamp information should still be included with any output stream buffers
  • FULL All metadata should be produced. Statistics will only be produced if they are separately enabled
How much metadata to produce on output
android.request.outputStreams byte x n [system] Lists which camera output streams image data from this capture must be sent to List of camera stream IDs List must only include streams that have been created If no output streams are listed, then the image data should simply be discarded. The image data must still be captured for metadata and statistics production, and the lens and flash must operate as requested.
scaler
controls
Property Name Type Description Units Range Notes Tags
android.scaler.cropRegion int32 x 4 [public as rectangle] (x, y, width, height).

A rectangle with the top-level corner of (x,y) and size (width, height). The region of the sensor that is used for output. Each stream must use this rectangle to produce its output, cropping to a smaller region if necessary to maintain the stream's aspect ratio.

HAL2.x uses only (x, y, width) 		(x,y) of top-left corner, width and height of region in pixels; (0,0) is top-left corner of android.sensor.activeArraySize Any additional per-stream cropping must be done to maximize the final pixel area of the stream.

For example, if the crop region is set to a 4:3 aspect ratio, then 4:3 streams should use the exact crop region. 16:9 streams should further crop vertically (letterbox).

Conversely, if the crop region is set to a 16:9, then 4:3 outputs should crop horizontally (pillarbox), and 16:9 streams should match exactly. These additional crops must be centered within the crop region.

The output streams must maintain square pixels at all times, no matter what the relative aspect ratios of the crop region and the stream are. Negative values for corner are allowed for raw output if full pixel array is larger than active pixel array. Width and height may be rounded to nearest larger supportable width, especially for raw output, where only a few fixed scales may be possible. The width and height of the crop region cannot be set to be smaller than floor( activeArraySize.width / android.scaler.maxDigitalZoom ) and floor( activeArraySize.height / android.scaler.maxDigitalZoom), respectively.
static
Property Name Type Description Units Range Notes Tags
android.scaler.availableFormats int32 x n [public as imageFormat]
values from HAL_PIXEL_FORMAT_* in /system/core/include/system/graphics.h
  • RAW_SENSOR 0x20
  • YV12 0x32315659 YCrCb 4:2:0 Planar
  • YCrCb_420_SP 0x11 NV21
  • IMPLEMENTATION_DEFINED 0x22 Hal Implementation Defined
  • YCbCr_420_888 0x23 Flexible YUV420 Format
  • BLOB 0x21 JPEG
List of app-visible formats
android.scaler.availableJpegMinDurations int64 x n [public] The minimum frame duration that is supported for each resolution in availableJpegSizes. Should correspond to the frame duration when only that JPEG stream is active and captured in a burst, with all processing set to FAST When multiple streams are configured, the minimum frame duration will be >= max(individual stream min durations)
android.scaler.availableJpegSizes int32 x n x 2 [public as size] The resolutions available for output from the JPEG block. Listed as width x height Must include: - sensor maximum resolution Should include: - half/quarter max resolution
android.scaler.availableMaxDigitalZoom float [public] The maximum ratio between active area width and crop region width, or between active area height and crop region height, if the crop region height is larger than width >=1
android.scaler.availableProcessedMinDurations int64 x n [public] The minimum frame duration that is supported for each resolution in availableProcessedSizes. Should correspond to the frame duration when only that processed stream is active, with all processing set to FAST When multiple streams are configured, the minimum frame duration will be >= max(individual stream min durations)
android.scaler.availableProcessedSizes int32 x n x 2 [public as size] The resolutions available for use with processed output streams, such as YV12, NV12, and platform opaque YUV/RGB streams to the GPU or video encoders. Listed as width, height Must include: - sensor maximum resolution - standard QCIF, 240p, 480p, 720p, and 1080p resolutions
android.scaler.availableRawMinDurations int64 x n [system] The minimum frame duration that is supported for each raw resolution in availableRawSizes. Should correspond to the frame duration when only the raw stream is active. When multiple streams are configured, the minimum frame duration will be >= max(individual stream min durations)
android.scaler.availableRawSizes int32 x n x 2 [system as size] The resolutions available for use with raw sensor output streams, listed as width, height Must include: - sensor maximum resolution
dynamic
Property Name Type Description Units Range Notes Tags
android.scaler.cropRegion int32 x 4 [public as rectangle] (x, y, width, height).

A rectangle with the top-level corner of (x,y) and size (width, height). The region of the sensor that is used for output. Each stream must use this rectangle to produce its output, cropping to a smaller region if necessary to maintain the stream's aspect ratio.

HAL2.x uses only (x, y, width) 		(x,y) of top-left corner, width and height of region in pixels; (0,0) is top-left corner of android.sensor.activeArraySize Any additional per-stream cropping must be done to maximize the final pixel area of the stream.

For example, if the crop region is set to a 4:3 aspect ratio, then 4:3 streams should use the exact crop region. 16:9 streams should further crop vertically (letterbox).

Conversely, if the crop region is set to a 16:9, then 4:3 outputs should crop horizontally (pillarbox), and 16:9 streams should match exactly. These additional crops must be centered within the crop region.

The output streams must maintain square pixels at all times, no matter what the relative aspect ratios of the crop region and the stream are. Negative values for corner are allowed for raw output if full pixel array is larger than active pixel array. Width and height may be rounded to nearest larger supportable width, especially for raw output, where only a few fixed scales may be possible. The width and height of the crop region cannot be set to be smaller than floor( activeArraySize.width / android.scaler.maxDigitalZoom ) and floor( activeArraySize.height / android.scaler.maxDigitalZoom), respectively.
sensor
controls
Property Name Type Description Units Range Notes Tags
android.sensor.exposureTime int64 [public] Duration each pixel is exposed to light nanoseconds android.sensor.info.exposureTimeRange 1/10000 - 30 sec range. No bulb mode
android.sensor.frameDuration int64 [public] Duration from start of frame exposure to start of next frame exposure nanoseconds see android.sensor.info.maxFrameDuration, android.scaler.info.availableMinFrameDurations Exposure time has priority, so duration is set to max(duration, exposure time + overhead)
android.sensor.sensitivity int32 [public] Gain applied to image data. Must be implemented through analog gain only if set to values below 'maximum analog sensitivity'. ISO arithmetic units android.sensor.info.sensitivityRange ISO 12232:2006 REI method
static
Property Name Type Description Units Range Notes Tags
android.sensor.info.activeArraySize int32 x 4 [public as rectangle]
Four ints defining the active pixel rectangle
 Area of raw data which corresponds to only active pixels; smaller or equal to pixelArraySize. xmin, ymin, width, height. Top left of full pixel array is (0,0)
android.sensor.info.sensitivityRange int32 x 2 [public]
Range of supported sensitivities
 Range of valid sensitivities Min <= 100, Max >= 1600
android.sensor.info.colorFilterArrangement byte [system]
  • RGGB
  • GRBG
  • GBRG
  • BGGR
  • RGB Sensor is not Bayer; output has 3 16-bit values for each pixel, instead of just 1 16-bit value per pixel.
Arrangement of color filters on sensor; represents the colors in the top-left 2x2 section of the sensor, in reading order
android.sensor.info.exposureTimeRange int64 x 2 [public]
nanoseconds
 Range of valid exposure times Min <= 100e3 (100 us), Max >= 30e9 (30 sec)
android.sensor.info.maxFrameDuration int64 [public] Maximum possible frame duration (minimum frame rate) nanoseconds >= 30e9 Minimum duration is a function of resolution, processing settings. See android.scaler.availableProcessedMinDurations android.scaler.availableJpegMinDurations android.scaler.availableRawMinDurations
android.sensor.info.physicalSize float x 2 [public as size]
width x height in millimeters
 The physical dimensions of the full pixel array Needed for FOV calculation for old API
android.sensor.info.pixelArraySize int32 x 2 [system as size] Dimensions of full pixel array, possibly including black calibration pixels Maximum output resolution for raw format must match this in android.scaler.info.availableSizesPerFormat
android.sensor.info.whiteLevel int32 [system] Maximum raw value output by sensor > 1024 (10-bit output) Defines sensor bit depth (10-14 bits is expected)
android.sensor.baseGainFactor rational [public] Gain factor from electrons to raw units when ISO=100
android.sensor.blackLevelPattern int32 x 4 [system]
2x2 raw count block
 A fixed black level offset for each of the Bayer mosaic channels >= 0 each As per DNG BlackLevelRepeatDim / BlackLevel tags
android.sensor.calibrationTransform1 rational x 9 [system]
3x3 matrix in row-major-order
 Per-device calibration on top of color space transform 1
android.sensor.calibrationTransform2 rational x 9 [system]
3x3 matrix in row-major-order
 Per-device calibration on top of color space transform 2
android.sensor.colorTransform1 rational x 9 [system]
3x3 matrix in row-major-order
 Linear mapping from XYZ (D50) color space to reference linear sensor color, for first reference illuminant Use as follows XYZ = inv(transform) * clip( (raw - black level(raw) ) / ( white level - max black level) ). At least in the simple case
android.sensor.colorTransform2 rational x 9 [system]
3x3 matrix in row-major-order
 Linear mapping from XYZ (D50) color space to reference linear sensor color, for second reference illuminant
android.sensor.forwardMatrix1 rational x 9 [system]
3x3 matrix in row-major-order
 Used by DNG for better WB adaptation
android.sensor.forwardMatrix2 rational x 9 [system]
3x3 matrix in row-major-order
 Used by DNG for better WB adaptation
android.sensor.maxAnalogSensitivity int32 [public] Maximum sensitivity that is implemented purely through analog gain For android.sensor.sensitivity values less than or equal to this, all applied gain must be analog. For values above this, it can be a mix of analog and digital
android.sensor.noiseModelCoefficients float x 2 [system]
float constants A, B for the noise variance model
 Estimation of sensor noise characteristics var(raw pixel value) = electrons * (baseGainFactor * iso/100)^2 + A * (baseGainFactor * iso/100)^2 + B A represents sensor read noise before analog amplification; B represents noise from A/D conversion and other circuits after amplification. Both noise sources are assumed to be gaussian, independent, and not to vary across the sensor
android.sensor.orientation int32 [public] Clockwise angle through which the output image needs to be rotated to be upright on the device screen in its native orientation. Also defines the direction of rolling shutter readout, which is from top to bottom in the sensor's coordinate system degrees clockwise rotation, only multiples of 90 0,90,180,270
android.sensor.referenceIlluminant1 byte [system]
  • DAYLIGHT 1
  • FLUORESCENT 2
  • TUNGSTEN 3 Incandescent light
  • FLASH 4
  • FINE_WEATHER 9
  • CLOUDY_WEATHER 10
  • SHADE 11
  • DAYLIGHT_FLUORESCENT 12 D 5700 - 7100K
  • DAY_WHITE_FLUORESCENT 13 N 4600 - 5400K
  • COOL_WHITE_FLUORESCENT 14 W 3900 - 4500K
  • WHITE_FLUORESCENT 15 WW 3200 - 3700K
  • STANDARD_A 17
  • STANDARD_B 18
  • STANDARD_C 19
  • D55 20
  • D65 21
  • D75 22
  • D50 23
  • ISO_STUDIO_TUNGSTEN 24
Light source used to define transform 1 [EXIF LightSource tag] Must all these be supported? Need CCT for each!
android.sensor.referenceIlluminant2 byte [system] Light source used to define transform 2 Same as illuminant 1
dynamic
Property Name Type Description Units Range Notes Tags
android.sensor.exposureTime int64 [public] Duration each pixel is exposed to light nanoseconds android.sensor.info.exposureTimeRange 1/10000 - 30 sec range. No bulb mode
android.sensor.frameDuration int64 [public] Duration from start of frame exposure to start of next frame exposure nanoseconds see android.sensor.info.maxFrameDuration, android.scaler.info.availableMinFrameDurations Exposure time has priority, so duration is set to max(duration, exposure time + overhead)
android.sensor.sensitivity int32 [public] Gain applied to image data. Must be implemented through analog gain only if set to values below 'maximum analog sensitivity'. ISO arithmetic units android.sensor.info.sensitivityRange ISO 12232:2006 REI method
android.sensor.timestamp int64 [public] Time at start of exposure of first row nanoseconds > 0 Monotonic, should be synced to other timestamps in system
shading
controls
Property Name Type Description Units Range Notes Tags
android.shading.mode byte [system]
  • OFF No shading correction is applied
  • FAST Must not slow down frame rate relative to raw bayer output
  • HIGH_QUALITY Frame rate may be reduced by high quality
Quality of lens shading correction applied to the image data
android.shading.strength byte [system] Control the amount of shading correction applied to the images unitless: 1-10; 10 is full shading compensation
dynamic
Property Name Type Description Units Range Notes Tags
android.shading.mode byte [system]
  • OFF No shading correction is applied
  • FAST Must not slow down frame rate relative to raw bayer output
  • HIGH_QUALITY Frame rate may be reduced by high quality
Quality of lens shading correction applied to the image data
statistics
controls
Property Name Type Description Units Range Notes Tags
android.statistics.faceDetectMode byte [public]
  • OFF
  • SIMPLE Optional Return rectangle and confidence only
  • FULL Optional Return all face metadata
State of the face detector unit android.statistics.info.availableFaceDetectModes Whether face detection is enabled, and whether it should output just the basic fields or the full set of fields. Value must be one of the android.statistics.info.availableFaceDetectModes.
android.statistics.histogramMode byte [system as boolean]
  • OFF
  • ON
Operating mode for histogram generation
android.statistics.sharpnessMapMode byte [system as boolean]
  • OFF
  • ON
Operating mode for sharpness map generation
android.statistics.lensShadingMapMode byte [public]
  • OFF
  • ON
Whether the HAL needs to output the lens shading map in output result metadata When set to ON, android.statistics.lensShadingMap must be provided in the output result metdata.
static
Property Name Type Description Units Range Notes Tags
android.statistics.info.availableFaceDetectModes byte x n [public]
List of enums from android.statistics.faceDetectMode
 Which face detection modes are available, if any List of enum: OFF SIMPLE FULL OFF means face detection is disabled, it must be included in the list.

SIMPLE means the device supports the android.statistics.faceRectangles and android.statistics.faceScores outputs.

FULL means the device additionally supports the android.statistics.faceIds and android.statistics.faceLandmarks outputs.
android.statistics.info.histogramBucketCount int32 [system] Number of histogram buckets supported >= 64
android.statistics.info.maxFaceCount int32 [public] Maximum number of simultaneously detectable faces >= 4 if availableFaceDetectionModes lists modes besides OFF, otherwise 0
android.statistics.info.maxHistogramCount int32 [system] Maximum value possible for a histogram bucket
android.statistics.info.maxSharpnessMapValue int32 [system] Maximum value possible for a sharpness map region.
android.statistics.info.sharpnessMapSize int32 x 2 [system as size]
width x height
 Dimensions of the sharpness map Must be at least 32 x 32
dynamic
Property Name Type Description Units Range Notes Tags
android.statistics.faceDetectMode byte [public]
  • OFF
  • SIMPLE Optional Return rectangle and confidence only
  • FULL Optional Return all face metadata
State of the face detector unit android.statistics.info.availableFaceDetectModes Whether face detection is enabled, and whether it should output just the basic fields or the full set of fields. Value must be one of the android.statistics.info.availableFaceDetectModes.
android.statistics.faceIds int32 x n [public] List of unique IDs for detected faces Only available if faceDetectMode == FULL
android.statistics.faceLandmarks int32 x n x 6 [public]
(leftEyeX, leftEyeY, rightEyeX, rightEyeY, mouthX, mouthY)
 List of landmarks for detected faces Only available if faceDetectMode == FULL
android.statistics.faceRectangles int32 x n x 4 [public as rectangle]
(xmin, ymin, xmax, ymax). (0,0) is top-left of active pixel area
 List of the bounding rectangles for detected faces Only available if faceDetectMode != OFF
android.statistics.faceScores byte x n [public] List of the face confidence scores for detected faces 0-100 Only available if faceDetectMode != OFF
android.statistics.histogram int32 x n x 3 [system]
count of pixels for each color channel that fall into each histogram bucket, scaled to be between 0 and maxHistogramCount
 A 3-channel histogram based on the raw sensor data The k'th bucket (0-based) covers the input range (with w = android.sensor.info.whiteLevel) of [ k * w/N, (k + 1) * w / N ). If only a monochrome sharpness map is supported, all channels should have the same data
android.statistics.histogramMode byte [system as boolean]
  • OFF
  • ON
Operating mode for histogram generation
android.statistics.sharpnessMap int32 x n x m x 3 [system]
estimated sharpness for each region of the input image. Normalized to be between 0 and maxSharpnessMapValue. Higher values mean sharper (better focused)
 A 3-channel sharpness map, based on the raw sensor data If only a monochrome sharpness map is supported, all channels should have the same data
android.statistics.sharpnessMapMode byte [system as boolean]
  • OFF
  • ON
Operating mode for sharpness map generation
android.statistics.lensShadingMap float x 4 x n x m [public]
2D array of float gain factors per channel to correct lens shading
 A low-resolution map of lens shading, per color channel Each gain factor is >= 1 Assume bilinear interpolation of map. The least shaded section of the image should have a gain factor of 1; all other sections should have gains above 1. the map should be on the order of 30-40 rows, and must be smaller than 64x64.
android.statistics.predictedColorGains float x 4 [public]
A 1D array of floats for 4 color channel gains
 The best-fit color channel gains calculated by the HAL's statistics units for the current output frame This may be different than the gains used for this frame, since statistics processing on data from a new frame typically completes after the transform has already been applied to that frame.

The 4 channel gains are defined in Bayer domain, see android.colorCorrection.gains for details.
android.statistics.predictedColorTransform rational x 3 x 3 [public]
3x3 rational matrix in row-major order
 The best-fit color transform matrix estimate calculated by the HAL's statistics units for the current output frame The HAL must provide the estimate from its statistics unit on the white balance transforms to use for the next frame. These are the values the HAL believes are the best fit for the current output frame. This may be different than the transform used for this frame, since statistics processing on data from a new frame typically completes after the transform has already been applied to that frame.

These estimates must be provided for all frames, even if capture settings and color transforms are set by the application.
android.statistics.sceneFlicker byte [public]
  • NONE
  • 50HZ
  • 60HZ
The HAL estimated scene illumination lighting frequency Report NONE if there doesn't appear to be flickering illumination
tonemap
controls
Property Name Type Description Units Range Notes Tags
android.tonemap.curveBlue float [public] Table mapping blue input values to output values same as android.tonemap.curveRed same as android.tonemap.curveRed
android.tonemap.curveGreen float [public] Table mapping green input values to output values same as android.tonemap.curveRed same as android.tonemap.curveRed
android.tonemap.curveRed float x n x 2 [public]
A 1D array of pairs of floats. mapping a 0-1 input range to a 0-1 output range.
 Table mapping red input values to output values 0-1 on input and output coordinates. Max entry count speciied by android.tonemap.maxCurvePoints .The input range must be monotonically increasing with N, and values between entries should be linearly interpolated. For example, if the array is: [0.0, 0.0, 0.3, 0.5, 1.0, 1.0], then the input->output mapping for a few sample points would be: 0 -> 0, 0.15 -> 0.25, 0.3 -> 0.5, 0.5 -> 0.64
android.tonemap.mode byte [public]
  • CONTRAST_CURVE Use the tone mapping curve specified in android.tonemap.curve
  • FAST Must not slow down frame rate relative to raw bayer output
  • HIGH_QUALITY Frame rate may be reduced by high quality
static
Property Name Type Description Units Range Notes Tags
android.tonemap.maxCurvePoints int32 [public] Maximum number of supported points in the tonemap curve >= 128
dynamic
Property Name Type Description Units Range Notes Tags
android.tonemap.curveBlue float [public] Table mapping blue input values to output values same as android.tonemap.curveRed same as android.tonemap.curveRed
android.tonemap.curveGreen float [public] Table mapping green input values to output values same as android.tonemap.curveRed same as android.tonemap.curveRed
android.tonemap.curveRed float x n x 2 [public]
A 1D array of pairs of floats. mapping a 0-1 input range to a 0-1 output range.
 Table mapping red input values to output values 0-1 on input and output coordinates. Max entry count speciied by android.tonemap.maxCurvePoints .The input range must be monotonically increasing with N, and values between entries should be linearly interpolated. For example, if the array is: [0.0, 0.0, 0.3, 0.5, 1.0, 1.0], then the input->output mapping for a few sample points would be: 0 -> 0, 0.15 -> 0.25, 0.3 -> 0.5, 0.5 -> 0.64
android.tonemap.mode byte [public]
  • CONTRAST_CURVE Use the tone mapping curve specified in android.tonemap.curve
  • FAST Must not slow down frame rate relative to raw bayer output
  • HIGH_QUALITY Frame rate may be reduced by high quality
led
controls
Property Name Type Description Units Range Notes Tags
android.led.transmit byte [hidden as boolean]
  • OFF
  • ON
This LED is nominally used to indicate to the user that the camera is powered on and may be streaming images back to the Application Processor. In certain rare circumstances, the OS may disable this when video is processed locally and not transmitted to any untrusted applications.

In particular, the LED *must* always be on when the data could be transmitted off the device. The LED *should* always be on whenever data is stored locally on the device.

The LED *may* be off if a trusted application is using the data that doesn't violate the above rules.
dynamic
Property Name Type Description Units Range Notes Tags
android.led.transmit byte [hidden as boolean]
  • OFF
  • ON
This LED is nominally used to indicate to the user that the camera is powered on and may be streaming images back to the Application Processor. In certain rare circumstances, the OS may disable this when video is processed locally and not transmitted to any untrusted applications.

In particular, the LED *must* always be on when the data could be transmitted off the device. The LED *should* always be on whenever data is stored locally on the device.

The LED *may* be off if a trusted application is using the data that doesn't violate the above rules.
static
Property Name Type Description Units Range Notes Tags
android.led.availableLeds byte x n [hidden]
  • TRANSMIT android.led.transmit control is used
A list of camera LEDs that are available on this system.
info
static
Property Name Type Description Units Range Notes Tags
android.info.supportedHardwareLevel byte [public]
  • LIMITED
  • FULL
The camera 3 HAL device can implement one of two possible operational modes; limited and full. Full support is expected from new higher-end devices. Limited mode has hardware requirements roughly in line with those for a camera HAL device v1 implementation, and is expected from older or inexpensive devices. Full is a strict superset of limited, and they share the same essential operational flow.

For full details refer to "S3. Operational Modes" in camera3.h 		Optional. Default value is LIMITED.
blackLevel
controls
Property Name Type Description Units Range Notes Tags
android.blackLevel.lock byte [public as boolean]
  • OFF
  • ON
Whether black-level compensation is locked to its current values, or is free to vary When set to ON, the values used for black-level compensation must not change until the lock is set to OFF

Since changes to certain capture parameters (such as exposure time) may require resetting of black level compensation, the HAL must report whether setting the black level lock was successful in the output result metadata.
dynamic
Property Name Type Description Units Range Notes Tags
android.blackLevel.lock byte [public as boolean]
  • OFF
  • ON
Whether black-level compensation is locked to its current values, or is free to vary When set to ON, the values used for black-level compensation must not change until the lock is set to OFF

Since changes to certain capture parameters (such as exposure time) may require resetting of black level compensation, the HAL must report whether setting the black level lock was successful in the output result metadata.

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