The Image Metadata API provides functions that allow to get information about stored image files.

This file contains the image metadata API and related functions to proceed with them. Functions include cloning and destroying the image metadata, getting image metadata such as width, height,
orientation, date taken.

Required Header

#include <media_content.h>

Overview

The Image Metadata API provides functions to get basic information associated with image files:

Attribute	Filter Keyword	Comments
width	MEDIA_WIDTH	Width
height	MEDIA_HEIGHT	Height
longitude	MEDIA_LONGITUDE	Get from metadata if exist.
latitude	MEDIA_LATITUDE	Get from metadata if exist.
altitude	MEDIA_ALTITUDE	Get from metadata if exist.
exposure_time	MEDIA_EXPOSURE_TIME	Get from EXIF if exist.
fnumber	MEDIA_FNUMBER	Get from EXIF if exist.
iso	MEDIA_ISO	Get from EXIF if exist.
model	MEDIA_MODEL	Get from EXIF if exist.
date_taken	MEDIA_DATETAKEN	Get from EXIF if exist.
orientation	MEDIA_ORIENTATION	Get from EXIF if exist.
is_360_content	MEDIA_360	Whether 360 content or not.

For getting the image handle (image_meta_h) from the media information (media_info_h), call media_info_get_image() function.
For getting the information related to image files stored in the device call the respective get functions e.g. to get the width of a image, call image_meta_get_width() function and to get orientation (media_content_orientation_e) of a image, call image_meta_get_orientation() function and so on.
When the image handle is no longer needed, it should be destroyed by calling image_meta_destroy() function.

Functions
int	image_meta_clone (image_meta_h *dst, image_meta_h src)
	Clones the image metadata.
int	image_meta_destroy (image_meta_h image)
	Destroys the image metadata.
int	image_meta_get_media_id (image_meta_h image, char **media_id)
	Gets the ID of an image.
int	image_meta_get_width (image_meta_h image, int *width)
	Gets the image width in pixels.
int	image_meta_get_height (image_meta_h image, int *height)
	Gets the image height in pixels.
int	image_meta_get_orientation (image_meta_h image, media_content_orientation_e *orientation)
	Gets the image orientation.
int	image_meta_get_date_taken (image_meta_h image, char **date_taken)
	Gets the image creation time.
int	image_meta_get_exposure_time (image_meta_h image, char **exposure_time)
	Gets the exposure time from EXIF.
int	image_meta_get_fnumber (image_meta_h image, double *fnumber)
	Gets the fnumber from EXIF.
int	image_meta_get_iso (image_meta_h image, int *iso)
	Gets the iso from EXIF.
int	image_meta_get_model (image_meta_h image, char **model)
	Gets the model from EXIF.
Typedefs
typedef struct image_meta_s *	image_meta_h
	The structure type for the Image metadata handle.

Typedef Documentation

typedef struct image_meta_s* image_meta_h

The structure type for the Image metadata handle.

Since :: 2.3.1

Function Documentation

int image_meta_clone	(	image_meta_h *	dst,
		image_meta_h	src
	)

Clones the image metadata.

The function copies the image metadata handle from a source to destination.

Since :: 2.3.1

Remarks:: The dst should be released using image_meta_destroy().

Parameters:

[out]	dst	The destination handle to the image metadata
[in]	src	The source handle to the image metadata

Returns:: 0 on success, otherwise a negative error value

Return values:

MEDIA_CONTENT_ERROR_NONE	Successful
MEDIA_CONTENT_ERROR_INVALID_PARAMETER	Invalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORY	Out of memory

See also:: image_meta_destroy()

int image_meta_destroy ( image_meta_h image )

Destroys the image metadata.

The function frees all resources related to the image metadata handle. This handle no longer can be used to perform any operations. A new handle has to be created before next usage.

Since :: 2.3.1

Parameters:

[in] image The handle to the image metadata

Returns:: 0 on success, otherwise a negative error value

Return values:

MEDIA_CONTENT_ERROR_NONE	Successful
MEDIA_CONTENT_ERROR_INVALID_PARAMETER	Invalid parameter

Precondition:: Get a copy of image_meta handle by calling image_meta_clone().

See also:: image_meta_clone()

int image_meta_get_date_taken	(	image_meta_h	image,
		char **	date_taken
	)

Gets the image creation time.

Since :: 2.3.1

Remarks:: The date_taken should be released using free().

Parameters:

[in]	image	The handle to the image metadata
[out]	date_taken	The time, when image was taken (in seconds, since the Epoch)

Returns:: 0 on success, otherwise a negative error value

Return values:

MEDIA_CONTENT_ERROR_NONE	Successful
MEDIA_CONTENT_ERROR_OUT_OF_MEMORY	Out of memory
MEDIA_CONTENT_ERROR_INVALID_PARAMETER	Invalid parameter

int image_meta_get_exposure_time	(	image_meta_h	image,
		char **	exposure_time
	)

Gets the exposure time from EXIF.

Since :: 3.0

Remarks:: The exposure_time should be released using free().

Parameters:

[in]	image	The handle to the image metadata
[out]	exposure_time	The value of exposure_time, getting from EXIF

Returns:: 0 on success, otherwise a negative error value

Return values:

MEDIA_CONTENT_ERROR_NONE	Successful
MEDIA_CONTENT_ERROR_OUT_OF_MEMORY	Out of memory
MEDIA_CONTENT_ERROR_INVALID_PARAMETER	Invalid parameter

int image_meta_get_fnumber	(	image_meta_h	image,
		double *	fnumber
	)

Gets the fnumber from EXIF.

Since :: 3.0

Parameters:

[in]	image	The handle to the image metadata
[out]	fnumber	The value of fnumber, getting from EXIF

Returns:: 0 on success, otherwise a negative error value

Return values:

MEDIA_CONTENT_ERROR_NONE	Successful
MEDIA_CONTENT_ERROR_INVALID_PARAMETER	Invalid parameter

int image_meta_get_height	(	image_meta_h	image,
		int *	height
	)

Gets the image height in pixels.

Since :: 2.3.1

Parameters:

[in]	image	The handle to the image metadata
[out]	height	The image height in pixels

Returns:: 0 on success, otherwise a negative error value

Return values:

MEDIA_CONTENT_ERROR_NONE	Successful
MEDIA_CONTENT_ERROR_INVALID_PARAMETER	Invalid parameter

int image_meta_get_iso	(	image_meta_h	image,
		int *	iso
	)

Gets the iso from EXIF.

Since :: 3.0

Parameters:

[in]	image	The handle to the image metadata
[out]	iso	The value of iso, getting from EXIF

Returns:: 0 on success, otherwise a negative error value

Return values:

MEDIA_CONTENT_ERROR_NONE	Successful
MEDIA_CONTENT_ERROR_INVALID_PARAMETER	Invalid parameter

int image_meta_get_media_id	(	image_meta_h	image,
		char **	media_id
	)

Gets the ID of an image.

Since :: 2.3.1

Remarks:: The media_id should be released using free().

Parameters:

[in]	image	The handle to the image metadata
[out]	media_id	The media ID

Returns:: 0 on success, otherwise a negative error value

Return values:

MEDIA_CONTENT_ERROR_NONE	Successful
MEDIA_CONTENT_ERROR_OUT_OF_MEMORY	Out of memory
MEDIA_CONTENT_ERROR_INVALID_PARAMETER	Invalid parameter

int image_meta_get_model	(	image_meta_h	image,
		char **	model
	)

Gets the model from EXIF.

Since :: 3.0

Remarks:: The model should be released using free().

Parameters:

[in]	image	The handle to the image metadata
[out]	model	The value of model, getting from EXIF

Returns:: 0 on success, otherwise a negative error value

Return values:

MEDIA_CONTENT_ERROR_NONE	Successful
MEDIA_CONTENT_ERROR_OUT_OF_MEMORY	Out of memory
MEDIA_CONTENT_ERROR_INVALID_PARAMETER	Invalid parameter

int image_meta_get_orientation	(	image_meta_h	image,
		media_content_orientation_e *	orientation
	)

Gets the image orientation.

Since :: 2.3.1

Parameters:

[in]	image	The handle to the image metadata
[out]	orientation	The image orientation

Returns:: 0 on success, otherwise a negative error value

Return values:

MEDIA_CONTENT_ERROR_NONE	Successful
MEDIA_CONTENT_ERROR_INVALID_PARAMETER	Invalid parameter

int image_meta_get_width	(	image_meta_h	image,
		int *	width
	)

Gets the image width in pixels.

Since :: 2.3.1

Parameters:

[in]	image	The handle to the image metadata
[out]	width	The image width in pixels

Returns:: 0 on success, otherwise a negative error value

Return values:

MEDIA_CONTENT_ERROR_NONE	Successful
MEDIA_CONTENT_ERROR_INVALID_PARAMETER	Invalid parameter

Required Header

Overview

Functions

Typedefs

Typedef Documentation

Function Documentation