KSPROPERTY_CAMERACONTROL_EXTENDED_EXPOSUREMODE
The exposure control property specifies whether the auto processing occurs for exposure or a manual time value is used instead.
Usage Summary Table
| Get | Set | Target | Property descriptor type | Property value type |
|---|---|---|---|---|
| Yes | Yes | Filter | KSPROPERTY | KSCAMERA_EXTENDEDPROP_HEADER |
The property value (operation data) contains a KSCAMERA_EXTENDEDPROP_HEADER structure and a KSCAMERA_EXTENDEDPROP_VIDEOPROCSETTING structure.
The total property data size is sizeof(KSCAMERA_EXTENDEDPROP_HEADER) + sizeof(KSCAMERA_EXTENDEDPROP_VIDEOPROCSETTING). The Size member of KSCAMERA_EXTENDEDPROP_HEADER is set to this total property data size.
The Capability member of KSCAMERA_EXTENDEDPROP_HEADER contains a bitwise OR combination of one or more of the following video processing options.
| Processing mode | Description |
|---|---|
| KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_AUTO | Camera driver uses its own processing logic for video. |
| KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_MANUAL | Camera driver uses a preset processing method. |
| KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_LOCK | The current video processing method is locked. |
The Flags member of KSCAMERA_EXTENDEDPROP_HEADER contains the video processing flag currently set for the camera. The KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_AUTO setting may be combined with KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_LOCK.
This property control is asynchronous and cancelable.
Remarks
Processing modes
KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_AUTO
This indicates that auto processing is supported. The driver will use its internal logic to optimize the video processing. For a KSPROPERTY_TYPE_GET request, the VideoProc member of KSCAMERA_EXTENDEDPROP_VIDEOPROCSETTING must contain the current driver determined value for the video processing.
This flag may be combined with KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_LOCK as a bitwise OR value.
Locking, without combining Auto mode, an already locked control should be treated as a no-op by the camera driver. Locking, in combination with Auto mode, an already locked control should trigger a new convergence.
This flag must not be combined with KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_MANUAL.
KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_MANUAL
Manual indicates that for this video processing, the specific values are provided. Specific values are provided to the driver.
This flag must not be combined with KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_AUTO or KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_LOCK.
KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_LOCK
The lock option flag indicates that the current video processing is locked to whatever value is currently programmed. For example, an application may request auto mode until a specific exposure is determined. At that point the application will decide to take a sequence of photos all with the same exposure. In such a case, the application may specify the KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_LOCK flag.
This flag must not be combined with KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_MANUAL.
Getting the property
When responding to a KSPROPERTY_TYPE_GET request, the driver sets the members of the KSCAMERA_EXTENDEDPROP_HEADER to the following.
| Member | Value |
|---|---|
| Version | 1 |
| PinId | KSCAMERA_EXTENDEDPROP_FILTERSCOPE (0xFFFFFFFF) |
| Size | sizeof(KSCAMERA_EXTENDEDPROP_HEADER) + sizeof(KSCAMERA_EXTENDEDPROP_VIDEOPROCSETTING) |
| Result | 0 |
| Capability | KSCAMERA_EXTENDEDPROP_CAPS_ASYNCCONTROL bitwise OR with (Video processing mode supported) |
| Flags | The current video processing mode |
If no exposure mode was previously set, then the driver sets Flags to KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_AUTO (default). The members of the KSCAMERA_EXTENDEDPROP_VIDEOPROCSETTING structure that follows KSCAMERA_EXTENDEDPROP_HEADER are set according to the requirements of the processing mode.
The VideoProp.Value.ull value must contain the current exposure setting when the mode is KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_AUTO.
Setting the property
When the property is set, a KSPROPERTY_TYPE_SET request, the Flags member of KSCAMERA_EXTENDEDPROP_HEADER will contain the exposure mode to set. The VideoProc.Value member of KSCAMERA_EXTENDEDPROP_VIDEOPROCSETTING must be ignored when Flags contains the KSCAMERA_EXTENDEDPROP_VIDEOPROCFLAG_AUTO mode flag.
Requirements
Version: Available starting with Windows 8.1
Header: ksmedia.h (include Ksmedia.h)