qctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
while (0 == ioctl (fd, VIDIOC_QUERYCTRL, &qctrl)) {
- /* ... */
- qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
+ /* ... */
+ qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
}
The initial control ID is set to 0 ORed with the
qctrl.id = V4L2_CTRL_CLASS_MPEG | V4L2_CTRL_FLAG_NEXT_CTRL;
while (0 == ioctl(fd, VIDIOC_QUERYCTRL, &qctrl)) {
- if (V4L2_CTRL_ID2CLASS(qctrl.id) != V4L2_CTRL_CLASS_MPEG)
- break;
- /* ... */
- qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
+ if (V4L2_CTRL_ID2CLASS(qctrl.id) != V4L2_CTRL_CLASS_MPEG)
+ break;
+ /* ... */
+ qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
}
The 32-bit ``qctrl.id`` value is subdivided into three bit ranges: the
- ``V4L2_MPEG_STREAM_VBI_FMT_IVTV``
- VBI in private packets, IVTV format (documented in the kernel
- sources in the file
- ``Documentation/video4linux/cx2341x/README.vbi``)
+ sources in the file
+ ``Documentation/video4linux/cx2341x/README.vbi``)
- ``V4L2_MPEG_VIDEO_PROFILE_ADVANCED_CODING_EFFICIENCY``
- -
+ -
- ``V4L2_MPEG_VIDEO_HEADER_MODE_JOINED_WITH_1ST_FRAME``
- The stream header is returned together with the first encoded
- frame.
+ frame.
- ``V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_INTERLEAVED_SLICES``
- Slices are interleaved one after other with macroblocks in run
- length order.
+ length order.
- .. row 2
- ``V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_SCATTERED_SLICES``
- Scatters the macroblocks based on a mathematical function known to
- both encoder and decoder.
+ both encoder and decoder.
- .. row 3
- ``V4L2_MPEG_MFC51_FRAME_SKIP_MODE_LEVEL_LIMIT``
- Frame skip mode enabled and buffer limit is set by the chosen
- level and is defined by the standard.
+ level and is defined by the standard.
- .. row 3
- ``V4L2_MPEG_MFC51_FRAME_SKIP_MODE_BUF_LIMIT``
- Frame skip mode enabled and buffer limit is set by the VBV
- (MPEG1/2/4) or CPB (H264) buffer size control.
+ (MPEG1/2/4) or CPB (H264) buffer size control.
- ``V4L2_CID_MPEG_VIDEO_VPX_2_REF_FRAME``
- Two frames will be searched among the last encoded frame, the
- golden frame and the alternate reference (altref) frame. The
- encoder implementation will decide which two are chosen.
+ golden frame and the alternate reference (altref) frame. The
+ encoder implementation will decide which two are chosen.
- .. row 3
- ``V4L2_CID_MPEG_VIDEO_VPX_3_REF_FRAME``
- The last encoded frame, the golden frame and the altref frame will
- be searched.
+ be searched.
- ``V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_USE_PREV``
- Use the (n-2)th frame as a golden frame, current frame index being
- 'n'.
+ 'n'.
- .. row 2
- ``V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_USE_REF_PERIOD``
- Use the previous specific frame indicated by
- V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD as a
- golden frame.
+ V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD as a
+ golden frame.
- ``V4L2_EXPOSURE_METERING_AVERAGE``
- Use the light information coming from the entire frame and average
- giving no weighting to any particular portion of the metered area.
+ giving no weighting to any particular portion of the metered area.
- .. row 2
- ``V4L2_EXPOSURE_METERING_CENTER_WEIGHTED``
- Average the light information coming from the entire frame giving
- priority to the center of the metered area.
+ priority to the center of the metered area.
- .. row 3
- ``V4L2_EXPOSURE_METERING_MATRIX``
- A multi-zone metering. The light intensity is measured in several
- points of the frame and the results are combined. The algorithm of
- the zones selection and their significance in calculating the
- final value is device dependent.
+ points of the frame and the results are combined. The algorithm of
+ the zones selection and their significance in calculating the
+ final value is device dependent.
- ``V4L2_AUTO_FOCUS_STATUS_FAILED``
- Automatic focus has failed, the driver will not transition from
- this state until another action is performed by an application.
+ this state until another action is performed by an application.
- ``V4L2_AUTO_FOCUS_RANGE_NORMAL``
- Normal distance range, limited for best automatic focus
- performance.
+ performance.
- .. row 3
- ``V4L2_AUTO_FOCUS_RANGE_MACRO``
- Macro (close-up) auto focus. The camera will use its minimum
- possible distance for auto focus.
+ possible distance for auto focus.
- .. row 4
- ``V4L2_WHITE_BALANCE_INCANDESCENT``
- White balance setting for incandescent (tungsten) lighting. It
- generally cools down the colors and corresponds approximately to
- 2500...3500 K color temperature range.
+ generally cools down the colors and corresponds approximately to
+ 2500...3500 K color temperature range.
- .. row 4
- ``V4L2_WHITE_BALANCE_FLUORESCENT``
- White balance preset for fluorescent lighting. It corresponds
- approximately to 4000...5000 K color temperature.
+ approximately to 4000...5000 K color temperature.
- .. row 5
- ``V4L2_WHITE_BALANCE_FLUORESCENT_H``
- With this setting the camera will compensate for fluorescent H
- lighting.
+ lighting.
- .. row 6
- ``V4L2_WHITE_BALANCE_HORIZON``
- White balance setting for horizon daylight. It corresponds
- approximately to 5000 K color temperature.
+ approximately to 5000 K color temperature.
- .. row 7
- ``V4L2_WHITE_BALANCE_DAYLIGHT``
- White balance preset for daylight (with clear sky). It corresponds
- approximately to 5000...6500 K color temperature.
+ approximately to 5000...6500 K color temperature.
- .. row 8
- ``V4L2_WHITE_BALANCE_FLASH``
- With this setting the camera will compensate for the flash light.
- It slightly warms up the colors and corresponds roughly to
- 5000...5500 K color temperature.
+ It slightly warms up the colors and corresponds roughly to
+ 5000...5500 K color temperature.
- .. row 9
- ``V4L2_WHITE_BALANCE_CLOUDY``
- White balance preset for moderately overcast sky. This option
- corresponds approximately to 6500...8000 K color temperature
- range.
+ corresponds approximately to 6500...8000 K color temperature
+ range.
- .. row 10
- ``V4L2_WHITE_BALANCE_SHADE``
- White balance preset for shade or heavily overcast sky. It
- corresponds approximately to 9000...10000 K color temperature.
+ corresponds approximately to 9000...10000 K color temperature.
- ``V4L2_SCENE_MODE_BACKLIGHT``
- Backlight. Compensates for dark shadows when light is coming from
- behind a subject, also by automatically turning on the flash.
+ behind a subject, also by automatically turning on the flash.
- .. row 3
- ``V4L2_SCENE_MODE_BEACH_SNOW``
- Beach and snow. This mode compensates for all-white or bright
- scenes, which tend to look gray and low contrast, when camera's
- automatic exposure is based on an average scene brightness. To
- compensate, this mode automatically slightly overexposes the
- frames. The white balance may also be adjusted to compensate for
- the fact that reflected snow looks bluish rather than white.
+ scenes, which tend to look gray and low contrast, when camera's
+ automatic exposure is based on an average scene brightness. To
+ compensate, this mode automatically slightly overexposes the
+ frames. The white balance may also be adjusted to compensate for
+ the fact that reflected snow looks bluish rather than white.
- .. row 4
- ``V4L2_SCENE_MODE_CANDLELIGHT``
- Candle light. The camera generally raises the ISO sensitivity and
- lowers the shutter speed. This mode compensates for relatively
- close subject in the scene. The flash is disabled in order to
- preserve the ambiance of the light.
+ lowers the shutter speed. This mode compensates for relatively
+ close subject in the scene. The flash is disabled in order to
+ preserve the ambiance of the light.
- .. row 5
- ``V4L2_SCENE_MODE_DAWN_DUSK``
- Dawn and dusk. Preserves the colors seen in low natural light
- before dusk and after down. The camera may turn off the flash, and
- automatically focus at infinity. It will usually boost saturation
- and lower the shutter speed.
+ before dusk and after down. The camera may turn off the flash, and
+ automatically focus at infinity. It will usually boost saturation
+ and lower the shutter speed.
- .. row 6
- ``V4L2_SCENE_MODE_FALL_COLORS``
- Fall colors. Increases saturation and adjusts white balance for
- color enhancement. Pictures of autumn leaves get saturated reds
- and yellows.
+ color enhancement. Pictures of autumn leaves get saturated reds
+ and yellows.
- .. row 7
- ``V4L2_SCENE_MODE_FIREWORKS``
- Fireworks. Long exposure times are used to capture the expanding
- burst of light from a firework. The camera may invoke image
- stabilization.
+ burst of light from a firework. The camera may invoke image
+ stabilization.
- .. row 8
- ``V4L2_SCENE_MODE_LANDSCAPE``
- Landscape. The camera may choose a small aperture to provide deep
- depth of field and long exposure duration to help capture detail
- in dim light conditions. The focus is fixed at infinity. Suitable
- for distant and wide scenery.
+ depth of field and long exposure duration to help capture detail
+ in dim light conditions. The focus is fixed at infinity. Suitable
+ for distant and wide scenery.
- .. row 9
- ``V4L2_SCENE_MODE_NIGHT``
- Night, also known as Night Landscape. Designed for low light
- conditions, it preserves detail in the dark areas without blowing
- out bright objects. The camera generally sets itself to a
- medium-to-high ISO sensitivity, with a relatively long exposure
- time, and turns flash off. As such, there will be increased image
- noise and the possibility of blurred image.
+ conditions, it preserves detail in the dark areas without blowing
+ out bright objects. The camera generally sets itself to a
+ medium-to-high ISO sensitivity, with a relatively long exposure
+ time, and turns flash off. As such, there will be increased image
+ noise and the possibility of blurred image.
- .. row 10
- ``V4L2_SCENE_MODE_PARTY_INDOOR``
- Party and indoor. Designed to capture indoor scenes that are lit
- by indoor background lighting as well as the flash. The camera
- usually increases ISO sensitivity, and adjusts exposure for the
- low light conditions.
+ by indoor background lighting as well as the flash. The camera
+ usually increases ISO sensitivity, and adjusts exposure for the
+ low light conditions.
- .. row 11
- ``V4L2_SCENE_MODE_PORTRAIT``
- Portrait. The camera adjusts the aperture so that the depth of
- field is reduced, which helps to isolate the subject against a
- smooth background. Most cameras recognize the presence of faces in
- the scene and focus on them. The color hue is adjusted to enhance
- skin tones. The intensity of the flash is often reduced.
+ field is reduced, which helps to isolate the subject against a
+ smooth background. Most cameras recognize the presence of faces in
+ the scene and focus on them. The color hue is adjusted to enhance
+ skin tones. The intensity of the flash is often reduced.
- .. row 12
- ``V4L2_SCENE_MODE_SPORTS``
- Sports. Significantly increases ISO and uses a fast shutter speed
- to freeze motion of rapidly-moving subjects. Increased image noise
- may be seen in this mode.
+ to freeze motion of rapidly-moving subjects. Increased image noise
+ may be seen in this mode.
- .. row 13
- ``V4L2_SCENE_MODE_SUNSET``
- Sunset. Preserves deep hues seen in sunsets and sunrises. It bumps
- up the saturation.
+ up the saturation.
- .. row 14
- ``V4L2_SCENE_MODE_TEXT``
- Text. It applies extra contrast and sharpness, it is typically a
- black-and-white mode optimized for readability. Automatic focus
- may be switched to close-up mode and this setting may also involve
- some lens-distortion correction.
+ black-and-white mode optimized for readability. Automatic focus
+ may be switched to close-up mode and this setting may also involve
+ some lens-distortion correction.
- ``V4L2_FLASH_STROBE_SOURCE_SOFTWARE``
- The flash strobe is triggered by using the
- V4L2_CID_FLASH_STROBE control.
+ V4L2_CID_FLASH_STROBE control.
- .. row 2
- ``V4L2_FLASH_STROBE_SOURCE_EXTERNAL``
- The flash strobe is triggered by an external source. Typically
- this is a sensor, which makes it possible to synchronises the
- flash strobe start to exposure start.
+ this is a sensor, which makes it possible to synchronises the
+ flash strobe start to exposure start.
- ``V4L2_FLASH_FAULT_OVER_VOLTAGE``
- Flash controller voltage to the flash LED has exceeded the limit
- specific to the flash controller.
+ specific to the flash controller.
- .. row 2
- ``V4L2_FLASH_FAULT_TIMEOUT``
- The flash strobe was still on when the timeout set by the user ---
- V4L2_CID_FLASH_TIMEOUT control --- has expired. Not all flash
- controllers may set this in all such conditions.
+ V4L2_CID_FLASH_TIMEOUT control --- has expired. Not all flash
+ controllers may set this in all such conditions.
- .. row 3
- ``V4L2_FLASH_FAULT_SHORT_CIRCUIT``
- The short circuit protection of the flash controller has been
- triggered.
+ triggered.
- .. row 5
- ``V4L2_FLASH_FAULT_OVER_CURRENT``
- Current in the LED power supply has exceeded the limit specific to
- the flash controller.
+ the flash controller.
- .. row 6
- ``V4L2_FLASH_FAULT_INDICATOR``
- The flash controller has detected a short or open circuit
- condition on the indicator LED.
+ condition on the indicator LED.
- .. row 7
- ``V4L2_FLASH_FAULT_UNDER_VOLTAGE``
- Flash controller voltage to the flash LED has been below the
- minimum limit specific to the flash controller.
+ minimum limit specific to the flash controller.
- .. row 8
- ``V4L2_FLASH_FAULT_INPUT_VOLTAGE``
- The input voltage of the flash controller is below the limit under
- which strobing the flash at full current will not be possible.The
- condition persists until this flag is no longer set.
+ which strobing the flash at full current will not be possible.The
+ condition persists until this flag is no longer set.
- .. row 9
- ``V4L2_DV_IT_CONTENT_TYPE_GRAPHICS``
- Graphics content. Pixel data should be passed unfiltered and
- without analog reconstruction.
+ without analog reconstruction.
- .. row 2
- ``V4L2_DV_IT_CONTENT_TYPE_PHOTO``
- Photo content. The content is derived from digital still pictures.
- The content should be passed through with minimal scaling and
- picture enhancements.
+ The content should be passed through with minimal scaling and
+ picture enhancements.
- .. row 3
- ``V4L2_DV_IT_CONTENT_TYPE_NO_ITC``
- No IT Content information is available and the ITC bit in the AVI
- InfoFrame is set to 0.
+ InfoFrame is set to 0.
- ``V4L2_DETECT_MD_MODE_THRESHOLD_GRID``
- The image is divided into a grid, each cell with its own motion
- detection threshold. These thresholds are set through the
- ``V4L2_CID_DETECT_MD_THRESHOLD_GRID`` matrix control.
+ detection threshold. These thresholds are set through the
+ ``V4L2_CID_DETECT_MD_THRESHOLD_GRID`` matrix control.
- .. row 4
- ``V4L2_DETECT_MD_MODE_REGION_GRID``
- The image is divided into a grid, each cell with its own region
- value that specifies which per-region motion detection thresholds
- should be used. Each region has its own thresholds. How these
- per-region thresholds are set up is driver-specific. The region
- values for the grid are set through the
- ``V4L2_CID_DETECT_MD_REGION_GRID`` matrix control.
+ value that specifies which per-region motion detection thresholds
+ should be used. Each region has its own thresholds. How these
+ per-region thresholds are set up is driver-specific. The region
+ values for the grid are set through the
+ ``V4L2_CID_DETECT_MD_REGION_GRID`` matrix control.
projects / deliverable / linux.git / blobdiff