*
* See camera_common.h for more versioning details.
*
- * Version history:
+ * Documentation index:
+ * S1. Version history
+ * S2. Startup and operation sequencing
+ * S3. Operational modes
+ * S4. 3A modes and state machines
+ * S5. Error management
+ */
+
+/**
+ * S1. Version history:
*
* 1.0: Initial Android camera HAL (Android 4.0) [camera.h]:
*
*/
/**
- * Startup and general expected operation sequence:
+ * S2. Startup and general expected operation sequence:
*
* 1. Framework calls camera_module_t->common.open(), which returns a
* hardware_device_t structure.
*/
/**
- * Operational modes:
+ * S3. Operational modes:
*
* The camera 3 HAL device can implement one of two possible operational modes;
* limited and full. Full support is expected from new higher-end
*
* Roughly speaking, limited-mode devices do not allow for application control
* of capture settings (3A control only), high-rate capture of high-resolution
- * images, raw sensor readout, and support for YUV output streams maximum
+ * images, raw sensor readout, or support for YUV output streams above maximum
* recording resolution (JPEG only for large images).
*
* ** Details of limited mode behavior:
*/
/**
- * Error management:
+ * S4. 3A modes and state machines:
+ *
+ * While the actual 3A algorithms are up to the HAL implementation, a high-level
+ * state machine description is defined by the HAL interface, to allow the HAL
+ * device and the framework to communicate about the current state of 3A, and to
+ * trigger 3A events.
+ *
+ * When the device is opened, all the individual 3A states must be
+ * STATE_INACTIVE. Stream configuration does not reset 3A. For example, locked
+ * focus must be maintained across the configure() call.
+ *
+ * Triggering a 3A action involves simply setting the relevant trigger entry in
+ * the settings for the next request to indicate start of trigger. For example,
+ * the trigger for starting an autofocus scan is setting the entry
+ * ANDROID_CONTROL_AF_TRIGGER to ANDROID_CONTROL_AF_TRIGGER_START for one
+ * request, and cancelling an autofocus scan is triggered by setting
+ * ANDROID_CONTROL_AF_TRIGGER to ANDROID_CONTRL_AF_TRIGGER_CANCEL. Otherwise,
+ * the entry will not exist, or be set to ANDROID_CONTROL_AF_TRIGGER_IDLE. Each
+ * request with a trigger entry set to a non-IDLE value will be treated as an
+ * independent triggering event.
+ *
+ * At the top level, 3A is controlled by the ANDROID_CONTROL_MODE setting, which
+ * selects between no 3A (ANDROID_CONTROL_MODE_OFF), normal AUTO mode
+ * (ANDROID_CONTROL_MODE_AUTO), and using the scene mode setting
+ * (ANDROID_CONTROL_USE_SCENE_MODE).
+ *
+ * - In OFF mode, each of the individual AE/AF/AWB modes are effectively OFF,
+ * and none of the capture controls may be overridden by the 3A routines.
+ *
+ * - In AUTO mode, Auto-focus, auto-exposure, and auto-whitebalance all run
+ * their own independent algorithms, and have their own mode, state, and
+ * trigger metadata entries, as listed in the next section.
+ *
+ * - In USE_SCENE_MODE, the value of the ANDROID_CONTROL_SCENE_MODE entry must
+ * be used to determine the behavior of 3A routines. In SCENE_MODEs other than
+ * FACE_PRIORITY, the HAL must override the values of
+ * ANDROId_CONTROL_AE/AWB/AF_MODE to be the mode it prefers for the selected
+ * SCENE_MODE. For example, the HAL may prefer SCENE_MODE_NIGHT to use
+ * CONTINUOUS_FOCUS AF mode. Any user selection of AE/AWB/AF_MODE when scene
+ * must be ignored for these scene modes.
+ *
+ * - For SCENE_MODE_FACE_PRIORITY, the AE/AWB/AF_MODE controls work as in
+ * ANDROID_CONTROL_MODE_AUTO, but the 3A routines must bias toward metering
+ * and focusing on any detected faces in the scene.
+ *
+ * S4.1. Auto-focus settings and result entries:
+ *
+ * Main metadata entries:
+ *
+ * ANDROID_CONTROL_AF_MODE: Control for selecting the current autofocus
+ * mode. Set by the framework in the request settings.
+ *
+ * AF_MODE_OFF: AF is disabled; the framework/app directly controls lens
+ * position.
+ *
+ * AF_MODE_AUTO: Single-sweep autofocus. No lens movement unless AF is
+ * triggered.
+ *
+ * AF_MODE_MACRO: Single-sweep up-close autofocus. No lens movement unless
+ * AF is triggered.
+ *
+ * AF_MODE_CONTINUOUS_VIDEO: Smooth continuous focusing, for recording
+ * video. Triggering immediately locks focus in current
+ * position. Canceling resumes cotinuous focusing.
+ *
+ * AF_MODE_CONTINUOUS_PICTURE: Fast continuous focusing, for
+ * zero-shutter-lag still capture. Triggering locks focus once currently
+ * active sweep concludes. Canceling resumes continuous focusing.
+ *
+ * AF_MODE_EDOF: Advanced extended depth of field focusing. There is no
+ * autofocus scan, so triggering one or canceling one has no effect.
+ * Images are focused automatically by the HAL.
+ *
+ * ANDROID_CONTROL_AF_STATE: Dynamic metadata describing the current AF
+ * algorithm state, reported by the HAL in the result metadata.
+ *
+ * AF_STATE_INACTIVE: No focusing has been done, or algorithm was
+ * reset. Lens is not moving. Always the state for MODE_OFF or MODE_EDOF.
+ * When the device is opened, it must start in this state.
+ *
+ * AF_STATE_PASSIVE_SCAN: A continuous focus algorithm is currently scanning
+ * for good focus. The lens is moving.
+ *
+ * AF_STATE_PASSIVE_FOCUSED: A continuous focus algorithm believes it is
+ * well focused. The lens is not moving. The HAL may spontaneously leave
+ * this state.
+ *
+ * AF_STATE_ACTIVE_SCAN: A scan triggered by the user is underway.
+ *
+ * AF_STATE_FOCUSED_LOCKED: The AF algorithm believes it is focused. The
+ * lens is not moving.
+ *
+ * AF_STATE_NOT_FOCUSED_LOCKED: The AF algorithm has been unable to
+ * focus. The lens is not moving.
+ *
+ * ANDROID_CONTROL_AF_TRIGGER: Control for starting an autofocus scan, the
+ * meaning of which is mode- and state- dependent. Set by the framework in
+ * the request settings.
+ *
+ * AF_TRIGGER_IDLE: No current trigger.
+ *
+ * AF_TRIGGER_START: Trigger start of AF scan. Effect is mode and state
+ * dependent.
+ *
+ * AF_TRIGGER_CANCEL: Cancel current AF scan if any, and reset algorithm to
+ * default.
+ *
+ * Additional metadata entries:
+ *
+ * ANDROID_CONTROL_AF_REGIONS: Control for selecting the regions of the FOV
+ * that should be used to determine good focus. This applies to all AF
+ * modes that scan for focus. Set by the framework in the request
+ * settings.
+ *
+ * S4.2. Auto-exposure settings and result entries:
+ *
+ * Main metadata entries:
+ *
+ * ANDROID_CONTROL_AE_MODE: Control for selecting the current auto-exposure
+ * mode. Set by the framework in the request settings.
+ *
+ * AE_MODE_OFF: Autoexposure is disabled; the user controls exposure, gain,
+ * frame duration, and flash.
+ *
+ * AE_MODE_ON: Standard autoexposure, with flash control disabled. User may
+ * set flash to fire or to torch mode.
+ *
+ * AE_MODE_ON_AUTO_FLASH: Standard autoexposure, with flash on at HAL's
+ * discretion for precapture and still capture. User control of flash
+ * disabled.
+ *
+ * AE_MODE_ON_ALWAYS_FLASH: Standard autoexposure, with flash always fired
+ * for capture, and at HAL's discretion for precapture.. User control of
+ * flash disabled.
+ *
+ * AE_MODE_ON_AUTO_FLASH_REDEYE: Standard autoexposure, with flash on at
+ * HAL's discretion for precapture and still capture. Use a flash burst
+ * at end of precapture sequence to reduce redeye in the final
+ * picture. User control of flash disabled.
+ *
+ * ANDROID_CONTROL_AE_STATE: Dynamic metadata describing the current AE
+ * algorithm state, reported by the HAL in the result metadata.
+ *
+ * AE_STATE_INACTIVE: Initial AE state after mode switch. When the device is
+ * opened, it must start in this state.
+ *
+ * AE_STATE_SEARCHING: AE is not converged to a good value, and is adjusting
+ * exposure parameters.
+ *
+ * AE_STATE_CONVERGED: AE has found good exposure values for the current
+ * scene, and the exposure parameters are not changing. HAL may
+ * spontaneously leave this state to search for better solution.
+ *
+ * AE_STATE_LOCKED: AE has been locked with the AE_LOCK control. Exposure
+ * values are not changing.
+ *
+ * AE_STATE_FLASH_REQUIRED: The HAL has converged exposure, but believes
+ * flash is required for a sufficiently bright picture. Used for
+ * determining if a zero-shutter-lag frame can be used.
+ *
+ * AE_STATE_PRECAPTURE: The HAL is in the middle of a precapture
+ * sequence. Depending on AE mode, this mode may involve firing the
+ * flash for metering, or a burst of flash pulses for redeye reduction.
+ *
+ * ANDROID_CONTROL_AE_PRECAPTURE_TRIGGER: Control for starting a metering
+ * sequence before capturing a high-quality image. Set by the framework in
+ * the request settings.
+ *
+ * PRECAPTURE_TRIGGER_IDLE: No current trigger.
+ *
+ * PRECAPTURE_TRIGGER_START: Start a precapture sequence. The HAL should
+ * use the subsequent requests to measure good exposure/white balance
+ * for an upcoming high-resolution capture.
+ *
+ * Additional metadata entries:
+ *
+ * ANDROID_CONTROL_AE_LOCK: Control for locking AE controls to their current
+ * values
+ *
+ * ANDROID_CONTROL_AE_EXPOSURE_COMPENSATION: Control for adjusting AE
+ * algorithm target brightness point.
+ *
+ * ANDROID_CONTROL_AE_TARGET_FPS_RANGE: Control for selecting the target frame
+ * rate range for the AE algorithm. The AE routine cannot change the frame
+ * rate to be outside these bounds.
+ *
+ * ANDROID_CONTROL_AE_REGIONS: Control for selecting the regions of the FOV
+ * that should be used to determine good exposure levels. This applies to
+ * all AE modes besides OFF.
+ *
+ * S4.3. Auto-whitebalance settings and result entries:
+ *
+ * Main metadata entries:
+ *
+ * ANDROID_CONTROL_AWB_MODE: Control for selecting the current white-balance
+ * mode.
+ *
+ * AWB_MODE_OFF: Auto-whitebalance is disabled. User controls color matrix.
+ *
+ * AWB_MODE_AUTO: Automatic white balance is enabled; 3A controls color
+ * transform, possibly using more complex transforms than a simple
+ * matrix.
+ *
+ * AWB_MODE_INCANDESCENT: Fixed white balance settings good for indoor
+ * incandescent (tungsten) lighting, roughly 2700K.
+ *
+ * AWB_MODE_FLUORESCENT: Fixed white balance settings good for fluorescent
+ * lighting, roughly 5000K.
+ *
+ * AWB_MODE_WARM_FLUORESCENT: Fixed white balance settings good for
+ * fluorescent lighting, roughly 3000K.
+ *
+ * AWB_MODE_DAYLIGHT: Fixed white balance settings good for daylight,
+ * roughly 5500K.
+ *
+ * AWB_MODE_CLOUDY_DAYLIGHT: Fixed white balance settings good for clouded
+ * daylight, roughly 6500K.
+ *
+ * AWB_MODE_TWILIGHT: Fixed white balance settings good for
+ * near-sunset/sunrise, roughly 15000K.
+ *
+ * AWB_MODE_SHADE: Fixed white balance settings good for areas indirectly
+ * lit by the sun, roughly 7500K.
+ *
+ * ANDROID_CONTROL_AWB_STATE: Dynamic metadata describing the current AWB
+ * algorithm state, reported by the HAL in the result metadata.
+ *
+ * AWB_STATE_INACTIVE: Initial AWB state after mode switch. When the device
+ * is opened, it must start in this state.
+ *
+ * AWB_STATE_SEARCHING: AWB is not converged to a good value, and is
+ * changing color adjustment parameters.
+ *
+ * AWB_STATE_CONVERGED: AWB has found good color adjustment values for the
+ * current scene, and the parameters are not changing. HAL may
+ * spontaneously leave this state to search for better solution.
+ *
+ * AWB_STATE_LOCKED: AWB has been locked with the AWB_LOCK control. Color
+ * adjustment values are not changing.
+ *
+ * Additional metadata entries:
+ *
+ * ANDROID_CONTROL_AWB_LOCK: Control for locking AWB color adjustments to
+ * their current values.
+ *
+ * ANDROID_CONTROL_AWB_REGIONS: Control for selecting the regions of the FOV
+ * that should be used to determine good color balance. This applies only
+ * to auto-WB mode.
+ *
+ * S4.4. General state machine transition notes
+ *
+ * Switching between AF, AE, or AWB modes always resets the algorithm's state
+ * to INACTIVE. Similarly, switching between CONTROL_MODE or
+ * CONTROL_SCENE_MODE if CONTROL_MODE == USE_SCENE_MODE resets all the
+ * algorithm states to INACTIVE.
+ *
+ * The tables below are per-mode.
+ *
+ * S4.5. AF state machines
+ *
+ * mode = AF_MODE_OFF or AF_MODE_EDOF
+ *| state | trans. cause | new state | notes |
+ *+--------------------+---------------+--------------------+------------------+
+ *| INACTIVE | | | AF is disabled |
+ *+--------------------+---------------+--------------------+------------------+
+ *
+ * mode = AF_MODE_AUTO or AF_MODE_MACRO
+ *| state | trans. cause | new state | notes |
+ *+--------------------+---------------+--------------------+------------------+
+ *| INACTIVE | AF_TRIGGER | ACTIVE_SCAN | Start AF sweep |
+ *| | | | Lens now moving |
+ *+--------------------+---------------+--------------------+------------------+
+ *| ACTIVE_SCAN | AF sweep done | FOCUSED_LOCKED | If AF successful |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| ACTIVE_SCAN | AF sweep done | NOT_FOCUSED_LOCKED | If AF successful |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| ACTIVE_SCAN | AF_CANCEL | INACTIVE | Cancel/reset AF |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Cancel/reset AF |
+ *+--------------------+---------------+--------------------+------------------+
+ *| FOCUSED_LOCKED | AF_TRIGGER | ACTIVE_SCAN | Start new sweep |
+ *| | | | Lens now moving |
+ *+--------------------+---------------+--------------------+------------------+
+ *| NOT_FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Cancel/reset AF |
+ *+--------------------+---------------+--------------------+------------------+
+ *| NOT_FOCUSED_LOCKED | AF_TRIGGER | ACTIVE_SCAN | Start new sweep |
+ *| | | | Lens now moving |
+ *+--------------------+---------------+--------------------+------------------+
+ *| All states | mode change | INACTIVE | |
+ *+--------------------+---------------+--------------------+------------------+
+ *
+ * mode = AF_MODE_CONTINUOUS_VIDEO
+ *| state | trans. cause | new state | notes |
+ *+--------------------+---------------+--------------------+------------------+
+ *| INACTIVE | HAL initiates | PASSIVE_SCAN | Start AF scan |
+ *| | new scan | | Lens now moving |
+ *+--------------------+---------------+--------------------+------------------+
+ *| INACTIVE | AF_TRIGGER | NOT_FOCUSED_LOCKED | AF state query |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_SCAN | HAL completes | PASSIVE_FOCUSED | End AF scan |
+ *| | current scan | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_SCAN | AF_TRIGGER | FOCUSED_LOCKED | Immediate trans. |
+ *| | | | if focus is good |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_SCAN | AF_TRIGGER | NOT_FOCUSED_LOCKED | Immediate trans. |
+ *| | | | if focus is bad |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_SCAN | AF_CANCEL | INACTIVE | Reset lens |
+ *| | | | position |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_FOCUSED | HAL initiates | PASSIVE_SCAN | Start AF scan |
+ *| | new scan | | Lens now moving |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_FOCUSED | AF_TRIGGER | FOCUSED_LOCKED | Immediate trans. |
+ *| | | | if focus is good |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_FOCUSED | AF_TRIGGER | NOT_FOCUSED_LOCKED | Immediate trans. |
+ *| | | | if focus is bad |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| FOCUSED_LOCKED | AF_TRIGGER | FOCUSED_LOCKED | No effect |
+ *+--------------------+---------------+--------------------+------------------+
+ *| FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Restart AF scan |
+ *+--------------------+---------------+--------------------+------------------+
+ *| NOT_FOCUSED_LOCKED | AF_TRIGGER | NOT_FOCUSED_LOCKED | No effect |
+ *+--------------------+---------------+--------------------+------------------+
+ *| NOT_FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Restart AF scan |
+ *+--------------------+---------------+--------------------+------------------+
+ *
+ * mode = AF_MODE_CONTINUOUS_PICTURE
+ *| state | trans. cause | new state | notes |
+ *+--------------------+---------------+--------------------+------------------+
+ *| INACTIVE | HAL initiates | PASSIVE_SCAN | Start AF scan |
+ *| | new scan | | Lens now moving |
+ *+--------------------+---------------+--------------------+------------------+
+ *| INACTIVE | AF_TRIGGER | NOT_FOCUSED_LOCKED | AF state query |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_SCAN | HAL completes | PASSIVE_FOCUSED | End AF scan |
+ *| | current scan | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_SCAN | AF_TRIGGER | FOCUSED_LOCKED | Eventual trans. |
+ *| | | | once focus good |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_SCAN | AF_TRIGGER | NOT_FOCUSED_LOCKED | Eventual trans. |
+ *| | | | if cannot focus |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_SCAN | AF_CANCEL | INACTIVE | Reset lens |
+ *| | | | position |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_FOCUSED | HAL initiates | PASSIVE_SCAN | Start AF scan |
+ *| | new scan | | Lens now moving |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_FOCUSED | AF_TRIGGER | FOCUSED_LOCKED | Immediate trans. |
+ *| | | | if focus is good |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PASSIVE_FOCUSED | AF_TRIGGER | NOT_FOCUSED_LOCKED | Immediate trans. |
+ *| | | | if focus is bad |
+ *| | | | Lens now locked |
+ *+--------------------+---------------+--------------------+------------------+
+ *| FOCUSED_LOCKED | AF_TRIGGER | FOCUSED_LOCKED | No effect |
+ *+--------------------+---------------+--------------------+------------------+
+ *| FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Restart AF scan |
+ *+--------------------+---------------+--------------------+------------------+
+ *| NOT_FOCUSED_LOCKED | AF_TRIGGER | NOT_FOCUSED_LOCKED | No effect |
+ *+--------------------+---------------+--------------------+------------------+
+ *| NOT_FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Restart AF scan |
+ *+--------------------+---------------+--------------------+------------------+
+ *
+ * S4.6. AE and AWB state machines
+ *
+ * The AE and AWB state machines are mostly identical. AE has additional
+ * FLASH_REQUIRED and PRECAPTURE states. So rows below that refer to those two
+ * states should be ignored for the AWB state machine.
+ *
+ * mode = AE_MODE_OFF / AWB mode not AUTO
+ *| state | trans. cause | new state | notes |
+ *+--------------------+---------------+--------------------+------------------+
+ *| INACTIVE | | | AE/AWB disabled |
+ *+--------------------+---------------+--------------------+------------------+
+ *
+ * mode = AE_MODE_ON_* / AWB_MODE_AUTO
+ *| state | trans. cause | new state | notes |
+ *+--------------------+---------------+--------------------+------------------+
+ *| INACTIVE | HAL initiates | SEARCHING | |
+ *| | AE/AWB scan | | |
+ *+--------------------+---------------+--------------------+------------------+
+ *| INACTIVE | AE/AWB_LOCK | LOCKED | values locked |
+ *| | on | | |
+ *+--------------------+---------------+--------------------+------------------+
+ *| SEARCHING | HAL finishes | CONVERGED | good values, not |
+ *| | AE/AWB scan | | changing |
+ *+--------------------+---------------+--------------------+------------------+
+ *| SEARCHING | HAL finishes | FLASH_REQUIRED | converged but too|
+ *| | AE scan | | dark w/o flash |
+ *+--------------------+---------------+--------------------+------------------+
+ *| SEARCHING | AE/AWB_LOCK | LOCKED | values locked |
+ *| | on | | |
+ *+--------------------+---------------+--------------------+------------------+
+ *| CONVERGED | HAL initiates | SEARCHING | values locked |
+ *| | AE/AWB scan | | |
+ *+--------------------+---------------+--------------------+------------------+
+ *| CONVERGED | AE/AWB_LOCK | LOCKED | values locked |
+ *| | on | | |
+ *+--------------------+---------------+--------------------+------------------+
+ *| LOCKED | AE/AWB_LOCK | SEARCHING | values not good |
+ *| | off | | after unlock |
+ *+--------------------+---------------+--------------------+------------------+
+ *| LOCKED | AE/AWB_LOCK | CONVERGED | values good |
+ *| | off | | after unlock |
+ *+--------------------+---------------+--------------------+------------------+
+ *| LOCKED | AE_LOCK | FLASH_REQUIRED | exposure good, |
+ *| | off | | but too dark |
+ *+--------------------+---------------+--------------------+------------------+
+ *| All AE states | PRECAPTURE_ | PRECAPTURE | Start precapture |
+ *| | START | | sequence |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PRECAPTURE | Sequence done.| CONVERGED | Ready for high- |
+ *| | AE_LOCK off | | quality capture |
+ *+--------------------+---------------+--------------------+------------------+
+ *| PRECAPTURE | Sequence done.| LOCKED | Ready for high- |
+ *| | AE_LOCK on | | quality capture |
+ *+--------------------+---------------+--------------------+------------------+
+ *
+ */
+
+/**
+ * S5. Error management:
*
* Camera HAL device ops functions that have a return value will all return
* -ENODEV / NULL in case of a serious error. This means the device cannot
* the close() method can be called successfully. All other methods will return
* -ENODEV / NULL.
*
+ * If a device op is called in the wrong sequence, for example if the framework
+ * calls configure_streams() is called before initialize(), the device must
+ * return -ENOSYS from the call, and do nothing.
+ *
* Transient errors in image capture must be reported through notify() as follows:
*
* - The failure of an entire capture to occur must be reported by the HAL by
* metadata could not be produced, it should be NULL. If some buffers could not
* be filled, their sync fences must be set to the error state.
*
- * Invalid input aguments result in -EINVAL from the appropriate methods. In
- * that case, the framework should act as if that call had never been made.
+ * Invalid input arguments result in -EINVAL from the appropriate methods. In
+ * that case, the framework must act as if that call had never been made.
*
*/
* buffer.
*
* NULL: In case of a fatal error. After this is returned, only
- * the close() method can be called succesfully by the
+ * the close() method can be called successfully by the
* framework.
*/
const camera_metadata_t* (*construct_default_request_settings)(
/**
* get_metadata_vendor_tag_ops:
*
- * Get methods to query for vendor extension metadata tag infomation. The
+ * Get methods to query for vendor extension metadata tag information. The
* HAL should fill in all the vendor tag operation methods, or leave ops
* unchanged if no vendor tags are defined.
*
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