GstPhotography

GstPhotography — Interface for digital image capture elements

Synopsis

                    GstPhotography;
enum                GstPhotographyNoiseReduction;
enum                GstWhiteBalanceMode;
enum                GstColourToneMode;
enum                GstSceneMode;
enum                GstFlashMode;
enum                GstFlickerReductionMode;
enum                GstFocusMode;
enum                GstFocusStatus;
enum                GstPhotoCaps;
enum                GstPhotoShakeRisk;
void                (*GstPhotoCapturePrepared)          (gpointer data,
                                                         const GstCaps *configured_caps);
gboolean            gst_photography_get_ev_compensation (GstPhotography *photo,
                                                         gfloat *ev_comp);
gboolean            gst_photography_get_iso_speed       (GstPhotography *photo,
                                                         guint *iso_speed);
gboolean            gst_photography_get_aperture        (GstPhotography *photo,
                                                         guint *aperture);
gboolean            gst_photography_get_exposure        (GstPhotography *photo,
                                                         guint32 *exposure);
gboolean            gst_photography_get_white_balance_mode
                                                        (GstPhotography *photo,
                                                         GstWhiteBalanceMode *wb_mode);
gboolean            gst_photography_get_colour_tone_mode
                                                        (GstPhotography *photo,
                                                         GstColourToneMode *tone_mode);
gboolean            gst_photography_get_scene_mode      (GstPhotography *photo,
                                                         GstSceneMode *scene_mode);
gboolean            gst_photography_get_flash_mode      (GstPhotography *photo,
                                                         GstFlashMode *flash_mode);
gboolean            gst_photography_get_noise_reduction (GstPhotography *photo,
                                                         guint *noise_reduction);
gboolean            gst_photography_get_zoom            (GstPhotography *photo,
                                                         gfloat *zoom);
gboolean            gst_photography_set_ev_compensation (GstPhotography *photo,
                                                         gfloat ev_comp);
gboolean            gst_photography_set_iso_speed       (GstPhotography *photo,
                                                         guint iso_speed);
gboolean            gst_photography_set_aperture        (GstPhotography *photo,
                                                         guint aperture);
gboolean            gst_photography_set_exposure        (GstPhotography *photo,
                                                         guint exposure);
gboolean            gst_photography_set_white_balance_mode
                                                        (GstPhotography *photo,
                                                         GstWhiteBalanceMode wb_mode);
gboolean            gst_photography_set_colour_tone_mode
                                                        (GstPhotography *photo,
                                                         GstColourToneMode tone_mode);
gboolean            gst_photography_set_scene_mode      (GstPhotography *photo,
                                                         GstSceneMode scene_mode);
gboolean            gst_photography_set_flash_mode      (GstPhotography *photo,
                                                         GstFlashMode flash_mode);
gboolean            gst_photography_set_noise_reduction (GstPhotography *photo,
                                                         guint noise_reduction);
gboolean            gst_photography_set_zoom            (GstPhotography *photo,
                                                         gfloat zoom);
GstPhotoCaps        gst_photography_get_capabilities    (GstPhotography *photo);
gboolean            gst_photography_prepare_for_capture (GstPhotography *photo,
                                                         GstPhotoCapturePrepared func,
                                                         GstCaps *capture_caps,
                                                         gpointer user_data);
void                gst_photography_set_autofocus       (GstPhotography *photo,
                                                         gboolean on);
gboolean            gst_photography_set_config          (GstPhotography *photo,
                                                         GstPhotoSettings *config);
gboolean            gst_photography_get_config          (GstPhotography *photo,
                                                         GstPhotoSettings *config);

Object Hierarchy

  GInterface
   +----GstPhotography

Prerequisites

GstPhotography requires GstImplementsInterface and GstElement.

Properties

  "aperture"                 guint                 : Read / Write
  "capabilities"             gulong                : Read
  "colour-tone-mode"         GstColourToneMode     : Read / Write
  "ev-compensation"          gfloat                : Read / Write
  "exposure"                 guint                 : Read / Write
  "flash-mode"               GstFlashMode          : Read / Write
  "flicker-mode"             GstFlickerReductionMode  : Read / Write
  "focus-mode"               GstFocusMode          : Read / Write
  "image-capture-supported-caps" GstCaps*              : Read
  "iso-speed"                guint                 : Read / Write
  "scene-mode"               GstSceneMode          : Read / Write
  "white-balance-mode"       GstWhiteBalanceMode   : Read / Write
  "image-preview-supported-caps" GstCaps*              : Read
  "noise-reduction"          GstPhotographyNoiseReduction  : Read / Write
  "zoom"                     gfloat                : Read / Write

Description

The interface allows access to some common digital image capture parameters.

Note

The GstPhotography interface is unstable API and may change in future. One can define GST_USE_UNSTABLE_API to acknowledge and avoid this warning.

Details

GstPhotography

typedef struct _GstPhotography GstPhotography;

Opaque GstPhotography data structure.

enum GstPhotographyNoiseReduction

typedef enum
{
  GST_PHOTOGRAPHY_NOISE_REDUCTION_BAYER = ( 1<<0 ),
  GST_PHOTOGRAPHY_NOISE_REDUCTION_YCC = ( 1<<1 ),
  GST_PHOTOGRAPHY_NOISE_REDUCTION_TEMPORAL= ( 1<< 2),
  GST_PHOTOGRAPHY_NOISE_REDUCTION_FIXED = (1 << 3),
  GST_PHOTOGRAPHY_NOISE_REDUCTION_EXTRA = (1 << 4)
} GstPhotographyNoiseReduction;

Noise Reduction features of a photography capture or filter element.

GST_PHOTOGRAPHY_NOISE_REDUCTION_BAYER

 Adaptive noise reduction on Bayer format

GST_PHOTOGRAPHY_NOISE_REDUCTION_YCC

 reduces the noise on Y and 2-chroma images.

GST_PHOTOGRAPHY_NOISE_REDUCTION_TEMPORAL

 Multi-frame adaptive NR, provided for the video mode

GST_PHOTOGRAPHY_NOISE_REDUCTION_FIXED

GST_PHOTOGRAPHY_NOISE_REDUCTION_EXTRA

 Extra Noise Reduction. In the case of high-ISO capturing, some noise remains after YCC NR. XNR reduces this remaining noise.

Since 0.10.21

enum GstWhiteBalanceMode

typedef enum
{
  GST_PHOTOGRAPHY_WB_MODE_AUTO = 0,
  GST_PHOTOGRAPHY_WB_MODE_DAYLIGHT,
  GST_PHOTOGRAPHY_WB_MODE_CLOUDY,
  GST_PHOTOGRAPHY_WB_MODE_SUNSET,
  GST_PHOTOGRAPHY_WB_MODE_TUNGSTEN,
  GST_PHOTOGRAPHY_WB_MODE_FLUORESCENT
} GstWhiteBalanceMode;

enum GstColourToneMode

typedef enum
{
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_NORMAL = 0,
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_SEPIA,
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_NEGATIVE,
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_GRAYSCALE,
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_NATURAL,
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_VIVID,
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_COLORSWAP,
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_SOLARIZE,
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_OUT_OF_FOCUS,
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_SKY_BLUE,
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_GRASS_GREEN,
  GST_PHOTOGRAPHY_COLOUR_TONE_MODE_SKIN_WHITEN
} GstColourToneMode;

enum GstSceneMode

typedef enum
{
  GST_PHOTOGRAPHY_SCENE_MODE_MANUAL = 0,
  GST_PHOTOGRAPHY_SCENE_MODE_CLOSEUP,
  GST_PHOTOGRAPHY_SCENE_MODE_PORTRAIT,
  GST_PHOTOGRAPHY_SCENE_MODE_LANDSCAPE,
  GST_PHOTOGRAPHY_SCENE_MODE_SPORT,
  GST_PHOTOGRAPHY_SCENE_MODE_NIGHT,
  GST_PHOTOGRAPHY_SCENE_MODE_AUTO
} GstSceneMode;

enum GstFlashMode

typedef enum
{
  GST_PHOTOGRAPHY_FLASH_MODE_AUTO = 0,
  GST_PHOTOGRAPHY_FLASH_MODE_OFF,
  GST_PHOTOGRAPHY_FLASH_MODE_ON,
  GST_PHOTOGRAPHY_FLASH_MODE_FILL_IN,
  GST_PHOTOGRAPHY_FLASH_MODE_RED_EYE
} GstFlashMode;

enum GstFlickerReductionMode

typedef enum
{
  GST_PHOTOGRAPHY_FLICKER_REDUCTION_OFF = 0,
  GST_PHOTOGRAPHY_FLICKER_REDUCTION_50HZ,
  GST_PHOTOGRAPHY_FLICKER_REDUCTION_60HZ,
  GST_PHOTOGRAPHY_FLICKER_REDUCTION_AUTO,
} GstFlickerReductionMode;

enum GstFocusMode

typedef enum {
    GST_PHOTOGRAPHY_FOCUS_MODE_AUTO = 0,
    GST_PHOTOGRAPHY_FOCUS_MODE_MACRO,
    GST_PHOTOGRAPHY_FOCUS_MODE_PORTRAIT,
    GST_PHOTOGRAPHY_FOCUS_MODE_INFINITY,
    GST_PHOTOGRAPHY_FOCUS_MODE_HYPERFOCAL,
    GST_PHOTOGRAPHY_FOCUS_MODE_EXTENDED,
    GST_PHOTOGRAPHY_FOCUS_MODE_CONTINUOUS_NORMAL,
    GST_PHOTOGRAPHY_FOCUS_MODE_CONTINUOUS_EXTENDED,
} GstFocusMode;

enum GstFocusStatus

typedef enum
{
  GST_PHOTOGRAPHY_FOCUS_STATUS_NONE = 0,
  GST_PHOTOGRAPHY_FOCUS_STATUS_RUNNING,
  GST_PHOTOGRAPHY_FOCUS_STATUS_FAIL,
  GST_PHOTOGRAPHY_FOCUS_STATUS_SUCCESS
} GstFocusStatus;

enum GstPhotoCaps

typedef enum
{
  GST_PHOTOGRAPHY_CAPS_NONE = (0 << 0),
  GST_PHOTOGRAPHY_CAPS_EV_COMP = (1 << 0),
  GST_PHOTOGRAPHY_CAPS_ISO_SPEED = (1 << 1),
  GST_PHOTOGRAPHY_CAPS_WB_MODE = (1 << 2),
  GST_PHOTOGRAPHY_CAPS_TONE = (1 << 3),
  GST_PHOTOGRAPHY_CAPS_SCENE = (1 << 4),
  GST_PHOTOGRAPHY_CAPS_FLASH = (1 << 5),
  GST_PHOTOGRAPHY_CAPS_ZOOM = (1 << 6),
  GST_PHOTOGRAPHY_CAPS_FOCUS = (1 << 7),
  GST_PHOTOGRAPHY_CAPS_APERTURE = (1 << 8),
  GST_PHOTOGRAPHY_CAPS_EXPOSURE = (1 << 9),
  GST_PHOTOGRAPHY_CAPS_SHAKE = (1 << 10),
  GST_PHOTOGRAPHY_CAPS_NOISE_REDUCTION = (1 << 11)
} GstPhotoCaps;

enum GstPhotoShakeRisk

typedef enum
{
  GST_PHOTOGRAPHY_SHAKE_RISK_LOW = 0,
  GST_PHOTOGRAPHY_SHAKE_RISK_MEDIUM,
  GST_PHOTOGRAPHY_SHAKE_RISK_HIGH,
} GstPhotoShakeRisk;

GstPhotoCapturePrepared ()

void                (*GstPhotoCapturePrepared)          (gpointer data,
                                                         const GstCaps *configured_caps);

This callback will be called when the element has finished preparations for photo capture.

data :

 user data that has been given, when registering the callback

configured_caps :

 GstCaps defining the configured capture format. Ownership of these caps stays in the element.

gst_photography_get_ev_compensation ()

gboolean            gst_photography_get_ev_compensation (GstPhotography *photo,
                                                         gfloat *ev_comp);

Get the ev compensation value for the GstElement

photo :

 GstPhotography interface of a GstElement

ev_comp :

 ev compensation value to get

Returns :

 TRUE if getting the value succeeded, FALSE otherwise

gst_photography_get_iso_speed ()

gboolean            gst_photography_get_iso_speed       (GstPhotography *photo,
                                                         guint *iso_speed);

Get the ISO value (light sensivity) for the GstElement

photo :

 GstPhotography interface of a GstElement

iso_speed :

 ISO speed value to get

Returns :

 TRUE if getting the value succeeded, FALSE otherwise

gst_photography_get_aperture ()

gboolean            gst_photography_get_aperture        (GstPhotography *photo,
                                                         guint *aperture);

Get the aperture value for the GstElement

photo :

 GstPhotography interface of a GstElement

aperture :

 aperture value to get

Returns :

 TRUE if getting the value succeeded, FALSE otherwise

gst_photography_get_exposure ()

gboolean            gst_photography_get_exposure        (GstPhotography *photo,
                                                         guint32 *exposure);

Get the fixed exposure time (in us) for the GstElement

photo :

 GstPhotography interface of a GstElement

exposure :

 exposure time to get

Returns :

 TRUE if getting the value succeeded, FALSE otherwise

gst_photography_get_white_balance_mode ()

gboolean            gst_photography_get_white_balance_mode
                                                        (GstPhotography *photo,
                                                         GstWhiteBalanceMode *wb_mode);

Get the white balance mode for the GstElement

photo :

 GstPhotography interface of a GstElement

wb_mode :

 GstWhiteBalanceMode to get

Returns :

 TRUE if getting the value succeeded, FALSE otherwise

gst_photography_get_colour_tone_mode ()

gboolean            gst_photography_get_colour_tone_mode
                                                        (GstPhotography *photo,
                                                         GstColourToneMode *tone_mode);

Get the colour tone mode for the GstElement

photo :

 GstPhotography interface of a GstElement

tone_mode :

 GstColourToneMode to get

Returns :

 TRUE if getting the value succeeded, FALSE otherwise

gst_photography_get_scene_mode ()

gboolean            gst_photography_get_scene_mode      (GstPhotography *photo,
                                                         GstSceneMode *scene_mode);

Get the scene mode for the GstElement

photo :

 GstPhotography interface of a GstElement

scene_mode :

 GstSceneMode to get

Returns :

 TRUE if getting the value succeeded, FALSE otherwise

gst_photography_get_flash_mode ()

gboolean            gst_photography_get_flash_mode      (GstPhotography *photo,
                                                         GstFlashMode *flash_mode);

Get the flash mode for the GstElement

photo :

 GstPhotography interface of a GstElement

flash_mode :

 GstFlashMode to get

Returns :

 TRUE if getting the value succeeded, FALSE otherwise

gst_photography_get_noise_reduction ()

gboolean            gst_photography_get_noise_reduction (GstPhotography *photo,
                                                         guint *noise_reduction);

Get the noise reduction mode for the GstElement

photo :

 GstPhotography interface of a GstElement

noise_reduction :

 GstNoiseReductionMode to get

Returns :

 TRUE if getting the value succeeded, FALSE otherwise

Since 0.10.21

gst_photography_get_zoom ()

gboolean            gst_photography_get_zoom            (GstPhotography *photo,
                                                         gfloat *zoom);

Get the zoom value for the GstElement

photo :

 GstPhotography interface of a GstElement

zoom :

 zoom value to get

Returns :

 TRUE if getting the value succeeded, FALSE otherwise

gst_photography_set_ev_compensation ()

gboolean            gst_photography_set_ev_compensation (GstPhotography *photo,
                                                         gfloat ev_comp);

Set the ev compensation value for the GstElement

photo :

 GstPhotography interface of a GstElement

ev_comp :

 ev compensation value to set

Returns :

 TRUE if setting the value succeeded, FALSE otherwise

gst_photography_set_iso_speed ()

gboolean            gst_photography_set_iso_speed       (GstPhotography *photo,
                                                         guint iso_speed);

Set the ISO value (light sensivity) for the GstElement

photo :

 GstPhotography interface of a GstElement

iso_speed :

 ISO speed value to set

Returns :

 TRUE if setting the value succeeded, FALSE otherwise

gst_photography_set_aperture ()

gboolean            gst_photography_set_aperture        (GstPhotography *photo,
                                                         guint aperture);

Set the aperture value for the GstElement

photo :

 GstPhotography interface of a GstElement

aperture :

 aperture value to set

Returns :

 TRUE if setting the value succeeded, FALSE otherwise

gst_photography_set_exposure ()

gboolean            gst_photography_set_exposure        (GstPhotography *photo,
                                                         guint exposure);

Set the fixed exposure time (in us) for the GstElement

photo :

 GstPhotography interface of a GstElement

exposure :

 exposure time to set

Returns :

 TRUE if setting the value succeeded, FALSE otherwise

gst_photography_set_white_balance_mode ()

gboolean            gst_photography_set_white_balance_mode
                                                        (GstPhotography *photo,
                                                         GstWhiteBalanceMode wb_mode);

Set the white balance mode for the GstElement

photo :

 GstPhotography interface of a GstElement

wb_mode :

 GstWhiteBalanceMode to set

Returns :

 TRUE if setting the value succeeded, FALSE otherwise

gst_photography_set_colour_tone_mode ()

gboolean            gst_photography_set_colour_tone_mode
                                                        (GstPhotography *photo,
                                                         GstColourToneMode tone_mode);

Set the colour tone mode for the GstElement

photo :

 GstPhotography interface of a GstElement

tone_mode :

 GstColourToneMode to set

Returns :

 TRUE if setting the value succeeded, FALSE otherwise

gst_photography_set_scene_mode ()

gboolean            gst_photography_set_scene_mode      (GstPhotography *photo,
                                                         GstSceneMode scene_mode);

Set the scene mode for the GstElement

photo :

 GstPhotography interface of a GstElement

scene_mode :

 GstSceneMode to set

Returns :

 TRUE if setting the value succeeded, FALSE otherwise

gst_photography_set_flash_mode ()

gboolean            gst_photography_set_flash_mode      (GstPhotography *photo,
                                                         GstFlashMode flash_mode);

Set the flash mode for the GstElement

photo :

 GstPhotography interface of a GstElement

flash_mode :

 GstFlashMode to set

Returns :

 TRUE if setting the value succeeded, FALSE otherwise

gst_photography_set_noise_reduction ()

gboolean            gst_photography_set_noise_reduction (GstPhotography *photo,
                                                         guint noise_reduction);

Set the noise reduction mode for the GstElement

photo :

 GstPhotography interface of a GstElement

noise_reduction :

 GstNoiseReductionMode to set

Returns :

 TRUE if setting the value succeeded, FALSE otherwise

Since 0.10.21

gst_photography_set_zoom ()

gboolean            gst_photography_set_zoom            (GstPhotography *photo,
                                                         gfloat zoom);

Set the zoom value for the GstElement. E.g. 1.0 to get original image and 3.0 for 3x zoom and so on.

photo :

 GstPhotography interface of a GstElement

zoom :

 zoom value to set

Returns :

 TRUE if setting the value succeeded, FALSE otherwise

gst_photography_get_capabilities ()

GstPhotoCaps        gst_photography_get_capabilities    (GstPhotography *photo);

Get GstPhotoCaps bitmask value that indicates what photography interface features the GstElement supports

photo :

 GstPhotography interface of a GstElement

Returns :

 GstPhotoCaps value

gst_photography_prepare_for_capture ()

gboolean            gst_photography_prepare_for_capture (GstPhotography *photo,
                                                         GstPhotoCapturePrepared func,
                                                         GstCaps *capture_caps,
                                                         gpointer user_data);

Start preparations for capture. func callback is called after preparations are done.

photo :

 GstPhotography interface of a GstElement

func :

 callback that is called after capturing has been prepared

capture_caps :

user_data :

 user data that will be passed to the callback func

Returns :

 TRUE if preparations were started (caps were OK), otherwise FALSE.

gst_photography_set_autofocus ()

void                gst_photography_set_autofocus       (GstPhotography *photo,
                                                         gboolean on);

Start or stop autofocusing. GST_PHOTOGRAPHY_AUTOFOCUS_DONE message is posted to bus when autofocusing has finished.

photo :

 GstPhotography interface of a GstElement

on :

 TRUE to start autofocusing, FALSE to stop autofocusing

gst_photography_set_config ()

gboolean            gst_photography_set_config          (GstPhotography *photo,
                                                         GstPhotoSettings *config);

Set all configuration settings at once.

photo :

 GstPhotography interface of a GstElement

config :

 GstPhotoSettings containg the configuration

Returns :

 TRUE if configuration was set successfully, otherwise FALSE.

gst_photography_get_config ()

gboolean            gst_photography_get_config          (GstPhotography *photo,
                                                         GstPhotoSettings *config);

Get all configuration settings at once.

photo :

 GstPhotography interface of a GstElement

config :

 GstPhotoSettings containg the configuration

Returns :

 TRUE if configuration was got successfully, otherwise FALSE.

Property Details

The "aperture" property

  "aperture"                 guint                 : Read / Write

Aperture defines the size of lens opening (0 = auto).

Allowed values: <= 255

Default value: 0

The "capabilities" property

  "capabilities"             gulong                : Read

Tells the photo capabilities of the device.

The "colour-tone-mode" property

  "colour-tone-mode"         GstColourToneMode     : Read / Write

Colour tone setting changes colour shading in the photo.

Default value: GST_PHOTOGRAPHY_COLOUR_TONE_MODE_NORMAL

The "ev-compensation" property

  "ev-compensation"          gfloat                : Read / Write

EV compensation affects the brightness of the image.

Allowed values: [-2.5,2.5]

Default value: 0

The "exposure" property

  "exposure"                 guint                 : Read / Write

Exposure time defines how long the shutter will stay open (0 = auto).

Default value: 0

The "flash-mode" property

  "flash-mode"               GstFlashMode          : Read / Write

Flash mode defines how the flash light should be used.

Default value: GST_PHOTOGRAPHY_FLASH_MODE_AUTO

The "flicker-mode" property

  "flicker-mode"             GstFlickerReductionMode  : Read / Write

Flicker reduction mode defines a line frequency for flickering prevention.

Default value: GST_PHOTOGRAPHY_FLICKER_REDUCTION_OFF

The "focus-mode" property

  "focus-mode"               GstFocusMode          : Read / Write

Focus mode defines the range of focal lengths to use in autofocus search.

Default value: GST_PHOTOGRAPHY_FOCUS_MODE_AUTO

The "image-capture-supported-caps" property

  "image-capture-supported-caps" GstCaps*              : Read

Caps describing supported image capture formats.

The "iso-speed" property

  "iso-speed"                guint                 : Read / Write

ISO speed defines the light sensitivity (0 = auto).

Allowed values: <= 6400

Default value: 0

The "scene-mode" property

  "scene-mode"               GstSceneMode          : Read / Write

Scene mode works as a preset for different photo shooting mode settings.

Default value: GST_PHOTOGRAPHY_SCENE_MODE_AUTO

The "white-balance-mode" property

  "white-balance-mode"       GstWhiteBalanceMode   : Read / Write

White balance affects the color temperature of the photo.

Default value: GST_PHOTOGRAPHY_WB_MODE_AUTO

The "image-preview-supported-caps" property

  "image-preview-supported-caps" GstCaps*              : Read

Caps describing supported image preview formats.

The "noise-reduction" property

  "noise-reduction"          GstPhotographyNoiseReduction  : Read / Write

Which noise reduction modes are enabled (0 = disabled).

The "zoom" property

  "zoom"                     gfloat                : Read / Write

How much the resulted image will be zoomed.

Allowed values: [1,10]

Default value: 1

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