Version: 20 Mar 2024

Camera

APIs for accessing Camera Device and to do Camera Capture. More...

Classes

	Name
struct	MLCameraMRConnectInfo
struct	MLCameraConnectContext
struct	MLCameraCaptureStreamCaps A structure to encapsulate stream capabilities.
struct	MLCameraCaptureStreamConfig
struct	MLCameraCaptureConfig
struct	MLCameraPlaneInfo
struct	MLCameraOutput
struct	MLCameraIntrinsicCalibrationParameters Camera intrinsic parameter.
struct	MLCameraResultExtras
struct	MLCameraDeviceAvailabilityInfo
struct	MLCameraDeviceAvailabilityStatusCallbacks
struct	MLCameraDeviceStatusCallbacks
struct	MLCameraCaptureCallbacks Capture callbacks to be implemented by client to receive capture status if callback mechanism is used.

Types

	Name
typedef MLHandle	MLCameraContext
typedef struct MLCameraMRConnectInfo	MLCameraMRConnectInfo
typedef struct MLCameraConnectContext	MLCameraConnectContext
typedef struct MLCameraCaptureStreamCaps	MLCameraCaptureStreamCaps A structure to encapsulate stream capabilities.
typedef struct MLCameraCaptureStreamConfig	MLCameraCaptureStreamConfig
typedef struct MLCameraCaptureConfig	MLCameraCaptureConfig
typedef struct MLCameraPlaneInfo	MLCameraPlaneInfo
typedef struct MLCameraOutput	MLCameraOutput
typedef struct MLCameraIntrinsicCalibrationParameters	MLCameraIntrinsicCalibrationParameters Camera intrinsic parameter.
typedef struct MLCameraResultExtras	MLCameraResultExtras
typedef struct MLCameraDeviceAvailabilityInfo	MLCameraDeviceAvailabilityInfo
typedef struct MLCameraDeviceAvailabilityStatusCallbacks	MLCameraDeviceAvailabilityStatusCallbacks
typedef struct MLCameraDeviceStatusCallbacks	MLCameraDeviceStatusCallbacks
typedef struct MLCameraCaptureCallbacks	MLCameraCaptureCallbacks Capture callbacks to be implemented by client to receive capture status if callback mechanism is used.

Enums

	Name
enum	Anonymous Enum 4 { MLCAMERA_MAXSTREAMS = 2 }
enum	MLCameraIdentifier { MLCameraIdentifier_MAIN = 0, MLCameraIdentifier_CV, MLCameraIdentifier_Ensure32Bits = 0x7FFFFFFF }
enum	MLCameraCaptureType { MLCameraCaptureType_Image = 0, MLCameraCaptureType_Video, MLCameraCaptureType_Preview, MLCameraCaptureType_Ensure32Bits = 0x7FFFFFFF } Captures operation type.
enum	MLCameraCaptureFrameRate { MLCameraCaptureFrameRate_None = 0, MLCameraCaptureFrameRate_15FPS, MLCameraCaptureFrameRate_30FPS, MLCameraCaptureFrameRate_60FPS, MLCameraCaptureFrameRate_Ensure32Bits = 0x7FFFFFFF } Captures frame rate.
enum	MLCameraMRQuality { MLCameraMRQuality_648x720 = 1, MLCameraMRQuality_972x1080 = 2, MLCameraMRQuality_1944x2160 = 3, MLCameraMRQuality_960x720 = 4, MLCameraMRQuality_1440x1080 = 5, MLCameraMRQuality_2880x2160 = 6, MLCameraMRQuality_Ensure32Bits = 0x7FFFFFFF } Video Quality enumeration for mixed reality capture.
enum	MLCameraConnectFlag { MLCameraConnectFlag_CamOnly = 0x0, MLCameraConnectFlag_VirtualOnly = 0x1, MLCameraConnectFlag_MR = 0x2, MLCameraConnectFlag_Ensure32Bits = 0x7FFFFFFF }
enum	MLCameraMRBlendType { MLCameraMRBlendType_Additive = 1, MLCameraMRBlendType_Ensure32Bits = 0x7FFFFFFF }
enum	MLCameraDisconnectReason { MLCameraDisconnect_DeviceLost = 0, MLCameraDisconnect_PriorityLost, MLCameraDisconnect_Ensure32Bits = 0x7FFFFFFF }
enum	MLCameraError { MLCameraError_None = 0, MLCameraError_Invalid, MLCameraError_Disabled, MLCameraError_DeviceFailed, MLCameraError_ServiceFailed, MLCameraError_CaptureFailed, MLCameraError_Ensure32Bits = 0x7FFFFFFF }
enum	MLCameraOutputFormat { MLCameraOutputFormat_Unknown, MLCameraOutputFormat_YUV_420_888, MLCameraOutputFormat_JPEG, MLCameraOutputFormat_RGBA_8888, MLCameraOutputFormat_Ensure32Bits = 0x7FFFFFFF } Captured output format. These three parameters determine which formats are supported:
enum	MLCameraDeviceStatusFlag { MLCameraDeviceStatusFlag_Connected = 1 << 0, MLCameraDeviceStatusFlag_Idle = 1 << 1, MLCameraDeviceStatusFlag_Streaming = 1 << 2, MLCameraDeviceStatusFlag_Disconnected = 1 << 3, MLCameraDeviceStatusFlag_Error = 1 << 4, MLCameraDeviceStatusFlag_Ensure32Bits = 0x7FFFFFFF }
enum	Anonymous Enum 5 { MLCamera_MaxImagePlanes = 3 }
enum	Anonymous Enum 6 { MLCameraIntrinsics_MaxDistortionCoefficients = 5 } Camera distortion vector size.

Functions

	Name
void	MLCameraConnectContextInit(MLCameraConnectContext * inout_context) Initialize the connect context structure.
void	MLCameraCaptureConfigInit(MLCameraCaptureConfig * inout_config) Initialize the capture config structure.
void	MLCameraDeviceAvailabilityStatusCallbacksInit(MLCameraDeviceAvailabilityStatusCallbacks * inout_device_availability_status_callbacks) Initialize the callback structure.
void	MLCameraDeviceStatusCallbacksInit(MLCameraDeviceStatusCallbacks * inout_device_status_callbacks) Initialize the callback structure.
void	MLCameraCaptureCallbacksInit(MLCameraCaptureCallbacks * inout_capture_callbacks) Initialize the callback structure.
MLResult	MLCameraInit(const MLCameraDeviceAvailabilityStatusCallbacks device_availability_status_callbacks, void user_data) Initialize ML Camera API, Register callback for device availability. If the user does not want to register device availability listener, MLCameraConnect can be called directly without MLCameraInit(). MLCameraDeInit should be used for unregistering callbacks and releasing resources acquired in MLCameraInit().
MLResult	MLCameraConnect(const MLCameraConnectContext input_context, MLCameraContext out_context) Connect to camera device.
MLResult	MLCameraGetNumSupportedStreams(MLCameraContext context, uint32_t * out_num_supported_streams) Query the no of streams supported by camera device.
MLResult	MLCameraGetStreamCaps(MLCameraContext context, const uint32_t stream_index, uint32_t inout_num_stream_caps, MLCameraCaptureStreamCaps inout_stream_caps) Query the stream capabilities.
MLResult	MLCameraDisconnect(MLCameraContext context) Disconnect from camera device.
MLResult	MLCameraDeInit() Uninitialize ML Camera API, unregister callback for device availability. Should be called after all camera devices are disconnected. After MLCameraDeInit, MLCameraInit can be called or MLCameraConnect can be called.
MLResult	MLCameraPreCaptureAEAWB(MLCameraContext context) Trigger AEAWB Convergence.
MLResult	MLCameraPrepareCapture(MLCameraContext context, const MLCameraCaptureConfig config, MLHandle out_request_handle) Prepare for capture.
MLResult	MLCameraUpdateCaptureSettings(MLCameraContext context) Update capture setting.
MLResult	MLCameraSetDeviceStatusCallbacks(MLCameraContext context, const MLCameraDeviceStatusCallbacks device_status_callbacks, void data) Set the client-implemented callbacks to convey camera device status.
MLResult	MLCameraSetCaptureCallbacks(MLCameraContext context, const MLCameraCaptureCallbacks capture_callbacks, void data) Set the client-implemented callbacks to convey capture status.
MLResult	MLCameraCaptureImage(MLCameraContext context, uint32_t num_images) Capture still image.
MLResult	MLCameraCaptureVideoStart(MLCameraContext context) Start video capture. Capture either encoded video or YUV/RGBA frames.
MLResult	MLCameraCapturePreviewStart(MLCameraContext context) Start preview provide raw frames through callback.
MLResult	MLCameraCaptureVideoStop(MLCameraContext context) Stop video capture.
MLResult	MLCameraCapturePreviewStop(MLCameraContext context) Stop preview.
MLResult	MLCameraGetDeviceStatus(MLCameraContext context, uint32_t * out_device_status) Poll camera device status.
MLResult	MLCameraGetDeviceAvailabilityStatus(MLCameraIdentifier cam_id, bool * out_device_availability_status) Poll camera device availability status.
MLResult	MLCameraGetErrorCode(MLCameraContext context, MLCameraError * out_error_code) Obtain camera device error code.
MLResult	MLCameraGetCameraCharacteristics(MLCameraContext context, MLHandle * out_characteristics_handle) Obtains handle for retrieving camera characteristics.

Detailed Description

APIs for accessing Camera Device and to do Camera Capture.

Supported Camera Modes, Resolutions, Capture Type, Formats and FrameRates

Camera	Mode	Resolution	Capture Type	Formats	FrameRate
Main	Cam_Only	640x480 1280x720 1280x960 1440x1080 1920x1080 2048x1536	Preview	YUV	15/30/60
			Image	YUV/JPEG	15/30/60
			Video	YUV/RGB/Compressed	15/30/60
		2880x2160 3840x2160 4096x3072	Preview	YUV	15/30
			Image	YUV/JPEG	15/30
			Video	YUV/RGB/Compressed	15/30

Note:
15Fps only supported in Auto Exposure Mode.
When multiple streams are configured frame rate is constrained by max resolution.
FrameRate_None can be used when only Image capture_type is used.

Camera	Mode	Resolution	Capture Type	Formats	FrameRate
CV	Cam_Only	640x480 1280x720 1280x960 1440x1080 1920x1080 2048x1536	Image	YUV	15/30/60
		640x480 1280x720 1280x960 1440x1080 1920x1080 2048x1536	Video	YUV/RGB	15/30/60
		2880x2160 3840x2160 4096x3072	Image	YUV	15/30
		2880x2160 3840x2160 4096x3072	Video	YUV/RGB	15/30

Note:
15Fps only supported in Auto Exposure Mode
FrameRate_None can be used when only Image capture_type is used.

Camera	Mode	Resolution	Capture Type	Formats	FrameRate
Main	MR/Virtual_Only	648x720	Image	RBG/JPEG	30/60
		648x720	Video	RGB/Compressed	30/60
		960x720	Image	RBG/JPEG	30/60
		960x720	Video	RGB/Compressed	30/60
		972x1080	Image	RBG/JPEG	30/60
		972x1080	Video	RGB/Compressed	30/60
		1440x1080	Image	RBG/JPEG	30/60
		1440x1080	Video	RGB/Compressed	30/60
		1944x2160	Image	RBG/JPEG	30
		1944x2160	Video	RGB/Compressed	30
		2880x2160	Image	RBG/JPEG	30
		2880x2160	Video	RGB/Compressed	30

Note: Quality and frame rate provided during connection should match the resolution and framerate in PrepareCapture.

Stringify the error codes returned by these APIs, call MLMediaResultGetString.

Warning

THIS API IS DEPRECATED IN FAVOR OF STANDARD ANDROID SDK AND NDK CAMERA APIs: https://developer.android.com/training/camera2 https://developer.android.com/ndk/reference/group/camera

Shared Object:

camera.magicleap*

Enums Documentation

Anonymous Enum 4

Enumerator	Value	Description
MLCAMERA_MAXSTREAMS	2	Max No of streams supported by logical camera.

MLCameraIdentifier

Enumerator	Value	Description
MLCameraIdentifier_MAIN	0	x86 logical camera.
MLCameraIdentifier_CV		CV logical camera.
MLCameraIdentifier_Ensure32Bits	0x7FFFFFFF	Ensure enum is represented as 32 bits.

Logical camera identifiers available for access.

MLCameraCaptureType

Enumerator	Value	Description
MLCameraCaptureType_Image	0	To capture an image.
MLCameraCaptureType_Video		To capture a video.
MLCameraCaptureType_Preview		To capture a video and access the raw buffer of the frames.
MLCameraCaptureType_Ensure32Bits	0x7FFFFFFF	Ensure enum is represented as 32 bits.

Captures operation type.

MLCameraCaptureFrameRate

Enumerator	Value	Description
MLCameraCaptureFrameRate_None	0	None, used for still capture.
MLCameraCaptureFrameRate_15FPS		Specified 15FPS.
MLCameraCaptureFrameRate_30FPS		Specified 30FPS.
MLCameraCaptureFrameRate_60FPS		Specified 60FPS.
MLCameraCaptureFrameRate_Ensure32Bits	0x7FFFFFFF	Ensure enum is represented as 32 bits.

Captures frame rate.

Call MLCameraPrepareCapture() to configure frame rate. Use MLCameraCaptureFrameRate_None when configuring only Image capture. Use MLCameraCaptureFrameRate_60fps only when resolution of captures <= 3MP(2048x1536). Use MLCameraCaptureFrameRate_15FPS only when MLCameraConnectFlag is MLCameraConnectFlag_CamOnly.

MLCameraMRQuality

Enumerator	Value	Description
MLCameraMRQuality_648x720	1	Specifies 648 x 720 resolution. Aspect ratio: 9x10.
MLCameraMRQuality_972x1080	2	Specifies 972 x 1080 resolution. Aspect ratio: 9x10.
MLCameraMRQuality_1944x2160	3	Specifies 1944 x 2160 resolution. Aspect ratio: 9x10. MLCameraCaptureFrameRate_60FPS is not supported for this quality mode.
MLCameraMRQuality_960x720	4	Specifies 960 x 720 resolution. Aspect ratio: 4x3.
MLCameraMRQuality_1440x1080	5	Specifies 1440 x 1080 resolution. Aspect ratio: 4x3.
MLCameraMRQuality_2880x2160	6	Specifies 2880 x 2160 resolution. Aspect ratio: 4x3. MLCameraCaptureFrameRate_60FPS is not supported for this quality mode.
MLCameraMRQuality_Ensure32Bits	0x7FFFFFFF	Ensure enum is represented as 32 bits.

Video Quality enumeration for mixed reality capture.

Use MLCameraGetStreamCaps to get the resolution.

MLCameraConnectFlag

Enumerator	Value	Description
MLCameraConnectFlag_CamOnly	0x0	Camera only frame capture.
MLCameraConnectFlag_VirtualOnly	0x1	Virtual only capture. Only supported for MLCameraIdentifier_MAIN.
MLCameraConnectFlag_MR	0x2	Mixed Reality capture. Only supported for MLCameraIdentifier_MAIN.
MLCameraConnectFlag_Ensure32Bits	0x7FFFFFFF	Ensure enum is represented as 32 bits.

Flags to describe various modules in camera pipeline.

MLCameraMRBlendType

Enumerator	Value	Description
MLCameraMRBlendType_Additive	1	Additive blend type. It simply adds pixel values of real world and virtual layer.
MLCameraMRBlendType_Ensure32Bits	0x7FFFFFFF	Ensure enum is represented as 32 bits.

Virtual and real content blending modes.

MLCameraDisconnectReason

Enumerator	Value	Description
MLCameraDisconnect_DeviceLost	0	Device lost.
MLCameraDisconnect_PriorityLost		Priority lost.
MLCameraDisconnect_Ensure32Bits	0x7FFFFFFF	Ensure enum is represented as 32 bits.

Camera disconnect reason.

MLCameraError

Enumerator	Value	Description
MLCameraError_None	0
MLCameraError_Invalid		Invalid/Unknown Error.
MLCameraError_Disabled		Camera disabled.
MLCameraError_DeviceFailed		Camera device failed.
MLCameraError_ServiceFailed		Camera service failed.
MLCameraError_CaptureFailed		Capture failed.
MLCameraError_Ensure32Bits	0x7FFFFFFF	Ensure enum is represented as 32 bits.

Camera errors.

MLCameraOutputFormat

Enumerator	Value	Description
MLCameraOutputFormat_Unknown
MLCameraOutputFormat_YUV_420_888		YUV planar format.
MLCameraOutputFormat_JPEG		Compressed output stream.
MLCameraOutputFormat_RGBA_8888		RGB32 format.
MLCameraOutputFormat_Ensure32Bits	0x7FFFFFFF	Ensure enum is represented as 32 bits.

Captured output format. These three parameters determine which formats are supported:

Camera type: [Main, CV].
Mode: [Real, MR, Virtual].
Capture type: [Preview, Video, Image]. These are formats supported:

Format	Camera Type	Mode	Capture Type
YUV	Main CV	Real Real	Preview, Video, Image Video, Image
RGBA	Main Main CR	Real MR, Virtual Real	Video Video, Image Video
JPEG	Main	Real, MR, Virtual	Image

MLCameraDeviceStatusFlag

Enumerator	Value	Description
MLCameraDeviceStatusFlag_Connected	1 << 0	Connected.
MLCameraDeviceStatusFlag_Idle	1 << 1	Idle.
MLCameraDeviceStatusFlag_Streaming	1 << 2	Opened.
MLCameraDeviceStatusFlag_Disconnected	1 << 3	Disconnected.
MLCameraDeviceStatusFlag_Error	1 << 4	Error. Call MLCameraGetErrorCode to obtain the error code.
MLCameraDeviceStatusFlag_Ensure32Bits	0x7FFFFFFF	Ensure enum is represented as 32 bits.

Client can implement polling mechanism to retrieve device status and use these masks to view device status.

Anonymous Enum 5

Enumerator	Value	Description
MLCamera_MaxImagePlanes	3	Number of planes representing the image color space.

Anonymous Enum 6

Enumerator	Value	Description
MLCameraIntrinsics_MaxDistortionCoefficients	5	Default distortion vector size.

Camera distortion vector size.

API Level:

Types Documentation

MLCameraContext

typedef MLHandle MLCameraContext;

Camera context to be used while connecting to camera.

More Info

MLCameraMRConnectInfo

typedef struct MLCameraMRConnectInfo MLCameraMRConnectInfo;

A structure to encapsulate connection settings for MR capture.

More Info

MLCameraConnectContext

typedef struct MLCameraConnectContext MLCameraConnectContext;

A structure to encapsulate context for a CameraConnect Request.

More Info

MLCameraCaptureStreamCaps

typedef struct MLCameraCaptureStreamCaps MLCameraCaptureStreamCaps;

A structure to encapsulate stream capabilities.

The capabilities for each stream supported by logical camera device can be queried with MLCameraGetStreamCaps.

More Info

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraCaptureStreamConfig

typedef struct MLCameraCaptureStreamConfig MLCameraCaptureStreamConfig;

A structure to encapsulate stream configurations.

More Info

MLCameraCaptureConfig

typedef struct MLCameraCaptureConfig MLCameraCaptureConfig;

A structure to encapsulate capture configuration.

More Info

MLCameraPlaneInfo

typedef struct MLCameraPlaneInfo MLCameraPlaneInfo;

Per plane info for captured output.

More Info

MLCameraOutput

typedef struct MLCameraOutput MLCameraOutput;

A structure to encapsulate captured output.

More Info

MLCameraIntrinsicCalibrationParameters

typedef struct MLCameraIntrinsicCalibrationParameters MLCameraIntrinsicCalibrationParameters;

Camera intrinsic parameter.

More Info

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraResultExtras

typedef struct MLCameraResultExtras MLCameraResultExtras;

A structure to encapsulate various indices for a capture result.

More Info

MLCameraDeviceAvailabilityInfo

typedef struct MLCameraDeviceAvailabilityInfo MLCameraDeviceAvailabilityInfo;

A structure to represent info on camera availability.

More Info

MLCameraDeviceAvailabilityStatusCallbacks

typedef struct MLCameraDeviceAvailabilityStatusCallbacks MLCameraDeviceAvailabilityStatusCallbacks;

Device availability status callbacks to be implemented by client to receive device availability status.

More Info

MLCameraDeviceStatusCallbacks

typedef struct MLCameraDeviceStatusCallbacks MLCameraDeviceStatusCallbacks;

Device status callbacks to be implemented by client to receive device status if callback mechanism is used.

More Info

MLCameraCaptureCallbacks

typedef struct MLCameraCaptureCallbacks MLCameraCaptureCallbacks;

Capture callbacks to be implemented by client to receive capture status if callback mechanism is used.

This structure must be initialized by calling MLCameraCaptureCallbacksInit() before use.

More Info

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

Functions Documentation

MLCameraConnectContextInit

static inline void MLCameraConnectContextInit(
    MLCameraConnectContext * inout_context
)

Initialize the connect context structure.

Parameters


MLCameraConnectContext *	inout_context	MLCameraConnectContext structure to initialize.

Required Permissions:

None

Shall be called before calling MLCameraConnect().

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraCaptureConfigInit

static inline void MLCameraCaptureConfigInit(
    MLCameraCaptureConfig * inout_config
)

Initialize the capture config structure.

Parameters


MLCameraCaptureConfig *	inout_config	MLCameraCaptureConfig structure to initialize.

Required Permissions:

None

Shall be called before calling MLCameraPrepareCapture().

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraDeviceAvailabilityStatusCallbacksInit

static inline void MLCameraDeviceAvailabilityStatusCallbacksInit(
    MLCameraDeviceAvailabilityStatusCallbacks * inout_device_availability_status_callbacks
)

Initialize the callback structure.

Parameters


MLCameraDeviceAvailabilityStatusCallbacks *	inout_device_availability_status_callbacks	Device availability status callbacks structure to initialize.

Required Permissions:

None

Shall be called before calling MLCameraSetDeviceAvailabilityStatusCallbacks().

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraDeviceStatusCallbacksInit

static inline void MLCameraDeviceStatusCallbacksInit(
    MLCameraDeviceStatusCallbacks * inout_device_status_callbacks
)

Initialize the callback structure.

Parameters


MLCameraDeviceStatusCallbacks *	inout_device_status_callbacks	Device status callbacks structure to initialize.

Required Permissions:

None

Shall be called before calling MLCameraSetDeviceStatusCallbacks().

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraCaptureCallbacksInit

static inline void MLCameraCaptureCallbacksInit(
    MLCameraCaptureCallbacks * inout_capture_callbacks
)

Initialize the callback structure.

Parameters


MLCameraCaptureCallbacks *	inout_capture_callbacks	Capture status callbacks structure to initialize.

Required Permissions:

None

Shall be called before calling MLCameraSetCaptureCallbacks().

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraInit

MLResult MLCameraInit(
    const MLCameraDeviceAvailabilityStatusCallbacks * device_availability_status_callbacks,
    void * user_data
)

Initialize ML Camera API, Register callback for device availability. If the user does not want to register device availability listener, MLCameraConnect can be called directly without MLCameraInit(). MLCameraDeInit should be used for unregistering callbacks and releasing resources acquired in MLCameraInit().

Parameters


const MLCameraDeviceAvailabilityStatusCallbacks *	device_availability_status_callbacks	Callback to notify camera availability status.
void *	user_data	Pointer to user context data (can be NULL).

Returns


MLResult	MLResult_Ok	Camera is initialized and callbacks registered successfully.
MLResult	MLResult_UnspecifiedFailure	The operation failed with an unspecified error.
MLResult	MLResult_PermissionDenied	Necessary permission is missing.

Required Permissions:

android.permission.CAMERA (protection level: dangerous)

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraConnect

MLResult MLCameraConnect(
    const MLCameraConnectContext * input_context,
    MLCameraContext * out_context
)

Connect to camera device.

Parameters


const MLCameraConnectContext *	input_context	MLCameraConnectContext structure.
MLCameraContext *	out_context	Camera context to be used in later APIs.

Returns


MLResult	MLResult_InvalidParam	One of the parameters is invalid.
MLResult	MLResult_UnspecifiedFailure	The operation failed with an unspecified error.
MLResult	MLResult_Ok	Connected to camera device successfully.
MLResult	MLMediaGenericResult_InvalidOperation	camera device already connected.
MLResult	MLResult_PermissionDenied	Necessary permission is missing.

Required Permissions:

android.permission.CAMERA (protection level: dangerous)

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraGetNumSupportedStreams

MLResult MLCameraGetNumSupportedStreams(
    MLCameraContext context,
    uint32_t * out_num_supported_streams
)

Query the no of streams supported by camera device.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().
uint32_t *	out_num_supported_streams	Number of streams supported by device.

Returns


MLResult	MLResult_InvalidParam	One of the parameters is invalid.
MLResult	MLResult_Ok	API call completed successfully.

Required Permissions:

None

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraGetStreamCaps

MLResult MLCameraGetStreamCaps(
    MLCameraContext context,
    const uint32_t stream_index,
    uint32_t * inout_num_stream_caps,
    MLCameraCaptureStreamCaps * inout_stream_caps
)

Query the stream capabilities.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().
const uint32_t	stream_index	Index of the stream for which to query capabilities. The index should be in the range [0 , num_supported_streams) where the num_supported_streams is from MLCameraGetNumSupportedStreams().
uint32_t *	inout_num_stream_caps	When the parameter inout_stream_caps is null, this is an output parameter which will hold the number of capabilities supported by the stream on function return. Otherwise this is an input parameter specifying the number of capabilities to retrieve, namely the size of the array pointed to by inout_stream_caps on return. The value should be in the range of [0, number-of-caps-retrieved].
MLCameraCaptureStreamCaps *	inout_stream_caps	This is either null or pointing to an array of MLCameraCaptureStreamCaps() on return. Note that caller is responsible for allocating and releasing the array.

Returns


MLResult	MLResult_InvalidParam	One of the parameters is invalid.
MLResult	MLResult_Ok	API call completed successfully.

Required Permissions:

None

Retrieves either the number of capabilities supported by the given stream or an array of capabilities for the given stream. To get the number of capabilities supported by the given stream, this API should be called with num_stream_caps being valid pointer and out_stream_caps being NULL. To retrieve the array of capabilities for the given stream, this API should be called with a valid num_stream_caps (that contains the size of the out_stream_caps) and out_stream_caps being a preallocated array of MLCameraCaptureStreamCaps of size specified by num_stream_caps.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraDisconnect

MLResult MLCameraDisconnect(
    MLCameraContext context
)

Disconnect from camera device.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().

Returns


MLResult	MLResult_Ok	Disconnected Camera device successfully.
MLResult	MLMediaGenericResult_InvalidOperation	Camera device already disconnected or camera device is streaming.

Required Permissions:

None

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraDeInit

MLResult MLCameraDeInit()

Uninitialize ML Camera API, unregister callback for device availability. Should be called after all camera devices are disconnected. After MLCameraDeInit, MLCameraInit can be called or MLCameraConnect can be called.

Returns


MLResult	MLResult_Ok	Deinitialization completed successfully.
MLResult	MLMediaGenericResult_InvalidOperation	DeInit called when camera device is connected.

Required Permissions:

None

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraPreCaptureAEAWB

MLResult MLCameraPreCaptureAEAWB(
    MLCameraContext context
)

Trigger AEAWB Convergence.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().

Returns


MLResult	MLResult_InvalidParam	Invalid camera context.
MLResult	MLResult_Ok	AEAWB convergence done.
MLResult	MLResult_UnspecifiedFailure	Unspecified failure.
MLResult	MLResult_Timeout	Timed out waiting for AEAWB convergence.
MLResult	MLMediaGenericResult_InvalidOperation	Camera device not configured using MLCameraPrepareCapture() or camera device is streaming.

Required Permissions:

None

This API triggers AEAWB sequence and returns when AEAWB convergence has been achieved. The Users can either trigger and converge AEAWB metadata settings or use this API.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraPrepareCapture

MLResult MLCameraPrepareCapture(
    MLCameraContext context,
    const MLCameraCaptureConfig * config,
    MLHandle * out_request_handle
)

Prepare for capture.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().
const MLCameraCaptureConfig *	config	Capture configuration.
MLHandle *	out_request_handle	Handle to the capture request metadata. Only valid if result is MLResult_Ok.

Returns


MLResult	MLResult_InvalidParam	Failed to prepare for capture due to invalid input parameter.
MLResult	MLResult_Ok	Prepared for capture successfully.
MLResult	MLResult_UnspecifiedFailure	Failed to prepare for capture due to internal error.
MLResult	MLMediaGenericResult_InvalidOperation	Camera device in streaming state.

Required Permissions:

None

This API prepares for capture per specified MLCameraCaptureType by creating a capture request, and a handle to which is returned to the user, who can choose to manipulate the request data (metadata) via APIs defined in ml_camera_metadata_v2.h before performing the capture.

Shall be called after MLCameraConnect().

Note: When preparing capture the width and height parameters should match one of the values returned from MLCameraGetStreamCaps.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraUpdateCaptureSettings

MLResult MLCameraUpdateCaptureSettings(
    MLCameraContext context
)

Update capture setting.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().

Returns


MLResult	MLResult_InvalidParam	Invalid context.
MLResult	MLMediaGenericResult_InvalidOperation	Camera not streaming video or not in preview.

Required Permissions:

None

This API updates the capture settings for an active preview/video stream. The API can be used to update capture settings like exposure compensation manual exposure settings like exposure time, iso setting.The capture settings can be changed in metadata handle returned by MLCameraPrepareCapture() and then this API can be called to apply the capture settings.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraSetDeviceStatusCallbacks

MLResult MLCameraSetDeviceStatusCallbacks(
    MLCameraContext context,
    const MLCameraDeviceStatusCallbacks * device_status_callbacks,
    void * data
)

Set the client-implemented callbacks to convey camera device status.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().
const MLCameraDeviceStatusCallbacks *	device_status_callbacks	Camera device status callbacks.
void *	data	User metadata.

Returns


MLResult	MLResult_InvalidParam	Invalid context.
MLResult	MLResult_Ok	Set device status callbacks successfully.

Required Permissions:

None

Client needs to implement the callbacks defined by MLCameraDeviceStatusCallbacks. The library passes the camera device status to the client via those callbacks.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraSetCaptureCallbacks

MLResult MLCameraSetCaptureCallbacks(
    MLCameraContext context,
    const MLCameraCaptureCallbacks * capture_callbacks,
    void * data
)

Set the client-implemented callbacks to convey capture status.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().
const MLCameraCaptureCallbacks *	capture_callbacks	Capture status callbacks.
void *	data	User metadata.

Returns


MLResult	MLResult_InvalidParam	Invalid context.
MLResult	MLResult_Ok	Set Capture callbacks successfully.
MLResult	MLResult_UnspecifiedFailure	Internal error occurred.

Required Permissions:

None

Client needs to implement the callbacks defined by MLCameraCaptureCallbacks. The library passes the capture status to the client via those callbacks.

Shall be called before capture operation for preview/image/video.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraCaptureImage

MLResult MLCameraCaptureImage(
    MLCameraContext context,
    uint32_t num_images
)

Capture still image.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().
uint32_t	num_images	Number of images to capture valid range is 1-10.

Returns


MLResult	MLResult_InvalidParam	Invalid context or invalid num_images.
MLResult	MLResult_Ok	Triggered image capture successfully.
MLResult	MLMediaGenericResult_InvalidOperation	MLMediaGenericResult_InvalidOperation Capture device in invalid state or image stream not configured by MLCameraPrepareCapture().
MLResult	MLResult_UnspecifiedFailure	Internal error occurred.

Required Permissions:

None

The output image will be returned in capture callback on_image_buffer_available.

This is a blocking call, it will return after the end of on_image_buffer_available callback execution.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraCaptureVideoStart

MLResult MLCameraCaptureVideoStart(
    MLCameraContext context
)

Start video capture. Capture either encoded video or YUV/RGBA frames.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().

Returns


MLResult	MLResult_InvalidParam	Invalid context input parameter.
MLResult	MLResult_Ok	Started video capture successfully.
MLResult	MLMediaGenericResult_InvalidOperation	Capture device in invalid state or video stream not configured by MLCameraPrepareCapture().
MLResult	MLResult_UnspecifiedFailure	Failed to start video recording due to internal error.

Required Permissions:

None

YUV/RGBA frames are provides through callback.For encoded video capture valid encoder input surface should be configured.The captured video YUV/RGBA frames will be returned to the application via on_video_buffer_available.

MLCameraCaptureVideoStop needs to be called to stop the capture.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraCapturePreviewStart

MLResult MLCameraCapturePreviewStart(
    MLCameraContext context
)

Start preview provide raw frames through callback.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().

Returns


MLResult	MLResult_InvalidParam	Invalid context.
MLResult	MLResult_Ok	Started preview successfully.
MLResult	MLResult_UnspecifiedFailure	Failed to start preview due to internal error.
MLResult	MLMediaGenericResult_InvalidOperation	Capture device in invalid state or preview stream not configured by MLCameraPrepareCapture().

Required Permissions:

None

The captured preview YUV frames will be returned to the application via on_preview_buffer_available.

MLCameraCapturePreviewStop needs to be called to stop the capture.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraCaptureVideoStop

MLResult MLCameraCaptureVideoStop(
    MLCameraContext context
)

Stop video capture.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().

Returns


MLResult	MLResult_InvalidParam	Invalid context.
MLResult	MLResult_Ok	Stopped video capture successfully.
MLResult	MLResult_UnspecifiedFailure	Failed to stop video recording due to internal error.
MLResult	MLMediaGenericResult_InvalidOperation	Capture device in invalid state or video stream not streaming.

Required Permissions:

None

User should allow some time, i.e., >500ms, after MLCameraCaptureVideoStart and before calling this API, as captured frames are being encoded. Otherwise, MLResult_UnspecifiedFailure will be returned.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraCapturePreviewStop

MLResult MLCameraCapturePreviewStop(
    MLCameraContext context
)

Stop preview.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().

Returns


MLResult	MLResult_InvalidParam	Invalid context.
MLResult	MLResult_Ok	Stopped video capture successfully.
MLResult	MLResult_UnspecifiedFailure	Failed to stop preview due to internal error.
MLResult	MLMediaGenericResult_InvalidOperation	Capture device in invalid state or preview stream not streaming.

Required Permissions:

None

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraGetDeviceStatus

MLResult MLCameraGetDeviceStatus(
    MLCameraContext context,
    uint32_t * out_device_status
)

Poll camera device status.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().
uint32_t *	out_device_status	Device status.

Returns


MLResult	MLResult_InvalidParam	Failed to obtain device status due to invalid input parameter.
MLResult	MLResult_Ok	Obtained device status successfully.

Required Permissions:

None

Use MLCameraDeviceStatusFlag to view specific status bit. Call MLCameraGetErrorCode() to obtain the error code if MLCameraDeviceStatusFlag_Error bit is set.

Note: This API can still be used even if MLCameraSetDeviceStatusCallbacks() has been called.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraGetDeviceAvailabilityStatus

MLResult MLCameraGetDeviceAvailabilityStatus(
    MLCameraIdentifier cam_id,
    bool * out_device_availability_status
)

Poll camera device availability status.

Parameters


MLCameraIdentifier	cam_id	Camera Id for which the availability status is to be queried.
bool *	out_device_availability_status	Device availability status.

Returns


MLResult	MLResult_InvalidParam	Failed to obtain device status due to invalid input parameter.
MLResult	MLResult_Ok	Obtained device status successfully.

Required Permissions:

None

Use MLCameraGetDeviceAvailabilityStatus to view specific status.

Note: This API can still be used even if availability status callback is not registered through MLCameraInit call.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraGetErrorCode

MLResult MLCameraGetErrorCode(
    MLCameraContext context,
    MLCameraError * out_error_code
)

Obtain camera device error code.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().
MLCameraError *	out_error_code	Camera device error code.

Returns


MLResult	MLResult_InvalidParam	Failed to obtain device error code due to invalid input parameter.
MLResult	MLResult_Ok	Obtained camera device error code successfully.

Required Permissions:

None

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

MLCameraGetCameraCharacteristics

MLResult MLCameraGetCameraCharacteristics(
    MLCameraContext context,
    MLHandle * out_characteristics_handle
)

Obtains handle for retrieving camera characteristics.

Parameters


MLCameraContext	context	Camera context obtained from MLCameraConnect().
MLHandle *	out_characteristics_handle	Handle to access camera characteristic metadata. Only valid if result is MLResult_Ok.

Returns


MLResult	MLResult_InvalidParam	Failed to obtain camera characteristic handle due to invalid input parameter.
MLResult	MLResult_Ok	Obtained camera characteristic handle successfully.
MLResult	MLResult_UnspecifiedFailure	Failed due to internal error.

Required Permissions:

None

This API provides the handle for retrieving camera characteristics via APIs defined in ml_camera_metadata_v2.h.

Deprecated

Deprecated since 1.4.0. Scheduled for removal.

API Level:

Camera

Classes​

Types​

Enums​

Functions​

Detailed Description​

Supported Camera Modes, Resolutions, Capture Type, Formats and FrameRates

Enums Documentation​

Anonymous Enum 4​

MLCameraIdentifier​

MLCameraCaptureType​

MLCameraCaptureFrameRate​

MLCameraMRQuality​

MLCameraConnectFlag​

MLCameraMRBlendType​

MLCameraDisconnectReason​

MLCameraError​

MLCameraOutputFormat​

MLCameraDeviceStatusFlag​

Anonymous Enum 5​

Anonymous Enum 6​

Types Documentation​

MLCameraContext​

MLCameraMRConnectInfo​

MLCameraConnectContext​

MLCameraCaptureStreamCaps​

MLCameraCaptureStreamConfig​

MLCameraCaptureConfig​

MLCameraPlaneInfo​

MLCameraOutput​

MLCameraIntrinsicCalibrationParameters​

MLCameraResultExtras​

MLCameraDeviceAvailabilityInfo​

MLCameraDeviceAvailabilityStatusCallbacks​

MLCameraDeviceStatusCallbacks​

MLCameraCaptureCallbacks​

Functions Documentation​

MLCameraConnectContextInit​

MLCameraCaptureConfigInit​

MLCameraDeviceAvailabilityStatusCallbacksInit​

MLCameraDeviceStatusCallbacksInit​

MLCameraCaptureCallbacksInit​

MLCameraInit​

MLCameraConnect​

MLCameraGetNumSupportedStreams​

MLCameraGetStreamCaps​

MLCameraDisconnect​

MLCameraDeInit​

MLCameraPreCaptureAEAWB​

MLCameraPrepareCapture​

MLCameraUpdateCaptureSettings​

MLCameraSetDeviceStatusCallbacks​

MLCameraSetCaptureCallbacks​

MLCameraCaptureImage​

MLCameraCaptureVideoStart​

MLCameraCapturePreviewStart​

MLCameraCaptureVideoStop​

MLCameraCapturePreviewStop​

MLCameraGetDeviceStatus​

MLCameraGetDeviceAvailabilityStatus​

MLCameraGetErrorCode​

MLCameraGetCameraCharacteristics​

Classes

Types

Enums

Functions

Detailed Description

Enums Documentation

Anonymous Enum 4

MLCameraIdentifier

MLCameraCaptureType

MLCameraCaptureFrameRate

MLCameraMRQuality

MLCameraConnectFlag

MLCameraMRBlendType

MLCameraDisconnectReason

MLCameraError

MLCameraOutputFormat

MLCameraDeviceStatusFlag

Anonymous Enum 5

Anonymous Enum 6

Types Documentation

MLCameraContext

MLCameraMRConnectInfo

MLCameraConnectContext

MLCameraCaptureStreamCaps

MLCameraCaptureStreamConfig

MLCameraCaptureConfig

MLCameraPlaneInfo

MLCameraOutput

MLCameraIntrinsicCalibrationParameters

MLCameraResultExtras

MLCameraDeviceAvailabilityInfo

MLCameraDeviceAvailabilityStatusCallbacks

MLCameraDeviceStatusCallbacks

MLCameraCaptureCallbacks

Functions Documentation

MLCameraConnectContextInit

MLCameraCaptureConfigInit

MLCameraDeviceAvailabilityStatusCallbacksInit

MLCameraDeviceStatusCallbacksInit

MLCameraCaptureCallbacksInit

MLCameraInit

MLCameraConnect

MLCameraGetNumSupportedStreams

MLCameraGetStreamCaps

MLCameraDisconnect

MLCameraDeInit

MLCameraPreCaptureAEAWB

MLCameraPrepareCapture

MLCameraUpdateCaptureSettings

MLCameraSetDeviceStatusCallbacks

MLCameraSetCaptureCallbacks

MLCameraCaptureImage

MLCameraCaptureVideoStart

MLCameraCapturePreviewStart

MLCameraCaptureVideoStop

MLCameraCapturePreviewStop

MLCameraGetDeviceStatus

MLCameraGetDeviceAvailabilityStatus

MLCameraGetErrorCode

MLCameraGetCameraCharacteristics