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2021-11-06ipa: ipu3: List the events in their order of callingJean-Michel Hautbois
The IPU3 IPA has three events which are handled from the pipeline handler. The events are received in the sequence, EventProcessControls, EventFillParams, and finally EventStatReady, while the code lists these in a different order. Update the flow of IPAIPU3::processEvent() to match the expected sequence of events, to help support the reader in interpreting the flow of events through the IPA. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2021-11-02libcamera: ipa: raspberrypi: Add support for imx519 sensorArducam info
The necessary tuning file and CamHelper is added for the imx519 sensor. The imx519 is a 16MP rolling shutter sensor. To enable it, please add dtoverlay=imx519 to the /boot/config.txt file and reboot the Pi. Signed-off-by: Lee Jackson <info@arducam.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Reviewed-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-26ipa: ipu3: agc: Clamp shutter speedJean-Michel Hautbois
In case the maximum exposure received from the sensor is very high, we can have a very high shutter speed with a small analogue gain, and it may result in very slow framerate. We are not really supporting it for the moment, so clamp the shutter speed to an arbitrary value of 60ms. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Tested-by: Umang Jain <umang.jain@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-26ipa: ipu3: ipa_context: Fix doxygen warningsKieran Bingham
The IPAFrameContext uses unnamed structures to group items. Doxygen doesn't seem to support this properly, documentation isn't properly generated and warnings are output during compilation. Suppress the warning with a workaround that still results in incorrect generated documentation until Doxygen gets fixed. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> [JMH: Fix doxygen variable usage] Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-26ipa: ipu3: Implement an empty stop() functionJean-Michel Hautbois
While the stop() function does not currently perform any action, it forms part of the IPA interface and is a public function in the class. Promote it to a full (but basic) function implementation and begin the documentation accordingly so that there is an appropriate stub to perform stop operations if they come up. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
2021-10-26ipa: ipu3: Fix badly documented context variablesJean-Michel Hautbois
Doxygen warns us because the structures are referenced as \struct while they should be \var. Fix it. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-26ipa: ipu3: Isolate ipa_context documentationKieran Bingham
The IPU3 IPA core is growing with additional documentation. The ipa_context documentation is stored here, but it pushes the IPU3 documentation and implementation further from the head of the file. Furthermore, the ipa_context documentation is outside of the ipa::ipu3 namespace and isn't identified correctly by Doxygen. Move the ipa_context to its own compilation object even though there isn't any code, but to maintain consistency with our documentation model. Correctly re-introduce the documentation into the libcamera::ipa::ipu3 namespace during the move. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
2021-10-26ipa: ipu3: algorithms: awb: Privatize internal structuresKieran Bingham
The struct RGB and struct AwbStatus are used only by the internal implementation of the AWB algorithm module. Move them into the private class declaration. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
2021-10-26ipa: ipu3: Fix the IPU3 AWB doxygen referencesKieran Bingham
The AWB AwbStatus structure is contained within the Awb class. Fix the Doxygen reference so that it can be found. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
2021-10-26ipa: ipu3: ipa_context: Fix file referenceKieran Bingham
The ipa_context.h entry incorrectly referenced its file name. Fix it. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
2021-10-26Documentation: IPU3 IPA Design guideKieran Bingham
The IPU3 IPA implements the basic 3A using the ImgU ISP. Provide an overview document to describe its operations, and provide a block diagram to help visualise how the components are put together to assist any new developers exploring the code. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
2021-10-26ipa: ipu3: tonemapping: Add the documentation for ToneMappingJean-Michel Hautbois
The tone mapping algorithm is currently undocumented. Provide an introduction and overview to the implementation as the class definition and document how the algorithm operates in the process and prepare methods. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-26ipa: ipu3: tonemapping: Implement configure callJean-Michel Hautbois
Let the algorithm perform its initial configuration. Implement configure() to set a default gamma value and let process do the updates needed. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-26ipa: ipu3: tonemapping: Generate the LUT only on gamma changeJean-Michel Hautbois
The tone mapping algorithm calculates the gamma curve for every frame, regardless of whether the gamma value has changed or not. This issue is exasperated as we currently hardcode the gamma to a single value. Optimise the implementation to only recalculate the look up table when the gamma setting is changed, and store the gamma setting of the LUT curve as part of the IPA context. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-26ipa: ipu3: agc: Document AGC mean-based algorithmJean-Michel Hautbois
The AGC class was not documented while developing. Extend that to reference the origins of the implementation, and improve the descriptions on how the algorithm operates internally. While at it, rename the functions which have bad names. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-26ipa: ipu3: awb: Reword accumulator documentationJean-Michel Hautbois
Now that we moved the diagram into the AWB class documentation, reword the accumulator documentation to make it clear it is not meant to be used only in AWB. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-26ipa: ipu3: awb: Add AWB class documentationJean-Michel Hautbois
The AWB algorithm is based on the Grey world algorithm and uses the statistics generated by the ImgU for that. Explain how it uses those, and reference the original algorithm at the same time. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-26ipa: ipu3: Explicitly use the statistics parameterJean-Michel Hautbois
The stats pointer is marked as [[maybe_unused]]. This is a leftover from a previous commit which was here to keep the compatibility while transitioning to the new iterative algorithms. Remove this attribute to make it explicit that stats are really used to feed the algorithms. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
2021-10-26ipa: ipu3: Document the IPAIPU3 classJean-Michel Hautbois
Clarify the roles and interactions between the pipeline handler events and the algorithm calls by documenting all the remaining functions of the class. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
2021-10-26ipa: ipu3: Document IPAIPU3::configureJean-Michel Hautbois
Further extend the documentation for the IPAIPU3::configure operation. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
2021-10-26ipa: ipu3: Document IPAIPU3 class interfaceJean-Michel Hautbois
The IPU3 IPA is maturing to a modular and extensible system capable of handling specific algorithms for the processing blocks on the ImgU. Provide a top-level class documentation to provide an overview of the IPA, detailing what events are used and what algorithms are currently supported, as well as the limitations currently imposed. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
2021-10-22ipa: ipu3: Use sensor limits for analogue gainJean-Michel Hautbois
Instead of using constants for the analogue gains limits, use the minimum and maximum from the configured sensor. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-22ipa: ipu3: agc: Remove unused variablesJean-Michel Hautbois
We currently control the exposure value by the shutter speed and the analogue gain. We can't use the digital gain to have more than the maximum exposure value calculated because we are not controlling it. Remove unused code associated with this digital gain. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-22ipa: ipu3: agc: Refactor condition on exposure correctionJean-Michel Hautbois
Simplify the reading by removing one level of indentation to return early when the change is small between two calls. Reword the LOG() message when we are correctly exposed, and move the lastFrame_ variable to update it even if the change is small. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-22ipa: ipu3: agc: Introduce previous exposure valueJean-Michel Hautbois
We need to calculate the gain on the previous exposure value calculated. Now that we initialise the exposure and gain values in configure(), we know the initial exposure value, and we can set it before any loop is running. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-22ipa: ipu3: agc: Rename gains properlyJean-Michel Hautbois
We have mixed terms between gain, analogue gain and the exposure value gain. Make it clear when we are using the analogue gain from the sensor, and when we are using the calculated gain to be applied to the exposure value to reach the target. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-22ipa: ipu3: agc: Simplify division of exposure/gainJean-Michel Hautbois
Until now, the algorithm makes complex assumptions when dividing the exposure and analogue gain values. Instead, use a simpler clamping of the shutter speed first, and then of the analogue gain, based on the limits configured. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-22ipa: ipu3: agc: Use filtered exposure valuesJean-Michel Hautbois
We are filtering the exposure value to limit the gain to apply, but we are not using the result. Fix it. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-22ipa: ipu3: agc: Change analogue gain limitsJean-Michel Hautbois
The gains are currently set as a uint32_t while the analogue gain is passed as a double. We also have a default maximum analogue gain of 15 which is quite high for a number of sensors. Use a maximum value of 8 which should really be configured by the IPA and not fixed as it is now. While at it make it a double. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-22ipa: ipu3: agc: Change exposure limitsJean-Michel Hautbois
We are using arbitrary constants for the exposure limit in a number of lines. Instead of using static constants for those, use the limits of the sensor passed in IPASessionConfiguration and cache those. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-22ipa: ipu3: agc: Rename exposure values properlyJean-Michel Hautbois
The exposure value is filtered in filterExposure() using the currentExposure_ and setting a prevExposure_ variable. This is misnamed as it is not the previous exposure, but a filtered value. Rename it accordingly. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-22ipa: ipu3: awb: Change minimal green threshold valueJean-Michel Hautbois
When zones are used for the grey world algorithm, they are only considered if their average green value is at least 32/255 to exclude zones that are too dark and don't provide relevant colour information (on the opposite side of the spectrum, saturated regions are excluded by the ImgU statistics engine). The algorithm requires a minimal number of zones that meet this criteria in order to run. Now that we correct the black level, the 32/255 minimal value is a bit high and prevents the algorithm for running in low-light conditions. Lower the value to 16/255 to fix it. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-22ipa: ipu3: awb: Use saturation under 90%Jean-Michel Hautbois
The AWB grey world algorithm tries to find a grey value and it can't do it on over-exposed images. To exclude those, the saturation ratio is used for each cell, and the cell is included only if this ratio is 0. Now that we have changed the threshold, more cells may be considered as partially saturated and excluded, preventing the algorithm from running efficiently. Change that behaviour, and consider 90% as a good enough ratio. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-22ipa: ipu3: set frameContext before controlsJean-Michel Hautbois
The AGC frame context needs to be initialised correctly for the first iteration. Until now, the IPA uses the minimum exposure and gain values and caches those in local variables. In order to give the sensor limits to AGC, create a new structure in IPASessionConfiguration. Store the exposure in time (and not line duration) and the analogue gain after CameraSensorHelper conversion. Set the gain and exposure appropriately to the current values known to the IPA and remove the setting of exposure and gain in IPAIPU3 as those are now fully controlled by IPU3Agc. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-22ipa: ipu3: awb: Set a threshold for the green saturationJean-Michel Hautbois
We can have a saturation ratio per cell, giving the percentage of pixels over a threshold within a cell where 100% is set to 0xff. The parameter structure 'ipu3_uapi_awb_config_s' contains four fields to set the threshold, one per channel. The blue field is also used to configure the ImgU and make it calculate the saturation ratio or not. Set a green value saturated when it is more than 230 (90% of the maximum value 255, coded as 8191). As this is the only channel used for AGC, there is no need to apply it to the other ones. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2021-10-19ipa: ipu3: agc: Remove "using" directive from agc.h headerLaurent Pinchart
"using" directives are harmful in headers, as they propagate the namespace short-circuit to all files that include the header, directly or indirectly. Drop the directive from agc.h, and use utils::Duration explicitly. While at it, shorten the namespace qualifier from libcamera::utils:: to utils:: in agc.cpp for Duration. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
2021-10-19ipa: ipu3: awb: Don't pass member variable to member functionLaurent Pinchart
The Awb::generateZones() member function fills the zones vector passed as an argument, which is actually a member variable. Use it directly in the function. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
2021-10-15ipa: ipu3: Update camera controls in configure()Jacopo Mondi
When a new CameraConfiguration is applied to the Camera the IPA is configured as well, using the newly applied sensor configuration and its updated V4L2 controls. Also update the Camera controls at IPA::configure() time by re-computing the controls::ExposureTime and controls::FrameDurationLimits limits and update the controls on the pipeline handler side after having configured the IPA. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-15ipa: raspberrypi: agc: Remove using namespace in agc.hppHirokazu Honda
"using namespace" in a header file propagates the namespace to the files including the header file. So it should be avoided. This removes "using namespace" in agc.hpp. Signed-off-by: Hirokazu Honda <hiroh@chromium.org> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-07pipeline: raspberrypi: Create empty control lists correctlyDavid Plowman
When the pipeline handler start() method is supplied with a NULL list of controls, we send an empty control list to the IPA. When the IPA is running in isolated mode the control list goes through the data serializer, for which it must be marked correctly as a list of "controls::controls", otherwise the IPA process will abort. The IPA has a similar problem returning a control list in its configure() method. We must be careful to initialise it properly even when empty. Signed-off-by: David Plowman <david.plowman@raspberrypi.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-06ipa: ipu3: Replace ipa::ipu3::algorithms::Ipu3AwbCellJean-Michel Hautbois
The intel-ipu3.h public interface from the kernel does not define how to parse the statistics for a cell. This had to be identified by a process of reverse engineering, and later identifying the structures from [0] leading to our custom definition of struct Ipu3AwbCell. [0] https://chromium.googlesource.com/chromiumos/platform/arc-camera/+/refs/heads/master/hal/intel/include/ia_imaging/awb_public.h To improve the kernel interface, a proposal has been made to the linux-kernel [1] to incorporate the memory layout for each cell into the intel-ipu3 header directly. [1] https://lore.kernel.org/linux-media/20211005202019.253353-1-jeanmichel.hautbois@ideasonboard.com/ Update our local copy of the intel-ipu3.h to match the proposal and change the AGC and AWB algorithms to reference that structure directly, allowing us to remove the deprecated custom Ipu3AwbCell definition. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-06ipa: ipu3: agc: Rewrite and simplify the brightness loopJean-Michel Hautbois
Now that we know how the AWB statistics are formatted, use a simplified loop in processBrightness() to parse the green values and get the histogram. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-06ipa: ipu3: awb: Introduce Black Level CorrectionJean-Michel Hautbois
The pixels output by the camera normally include a black level, because sensors do not always report a signal level of '0' for black. Pixels at or below this level should be considered black and to achieve that, we need to substract an offset to all the pixels. This can be taken into account by reading the lowest value of a special region on sensors which is not exposed to light. This provides a substracting factor to be able to adjust the expected black levels in the resulting images. For a camera outputting 10-bit pixel values (in the range 0 to 1023) a typical black level might be 64. It is a fixed value, obtained by capturing a raw frame with minimum exposure and gain fixed to 1.0 while covering the sensor (the darker the better). We consider it good enough as a very first approximation, until we measure it during a tuning process and include it in a configuration file Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-06ipa: ipu3: awb: Use the line stride for the statsJean-Michel Hautbois
The statistics buffer 'ipu3_uapi_awb_raw_buffer' stores the ImgU calculation results in a buffer aligned horizontally to a multiple of 4 cells. The AWB loop should take care of it to add the proper offset between lines and avoid any staircase effect. It is no longer required to pass the grid configuration context to the private functions called from process() which simplifies the code flow. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-06ipa: ipu3: awb: Correct the gain multipliersJean-Michel Hautbois
The gains have a precision u3.13, range [0, 8[ which means that a gain multiplier value of 1.0 is represented as a multiplication by 8192 in the ImgU. Correct the gains as this was misunderstood in the first place. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-06ipa: ipu3: awb: Correct the relevant zones proportionJean-Michel Hautbois
The algorithm uses the statistics of a cell only if there is not too much saturated pixels in it. The grey world algorithm works fine when there are a limited number of outliers. Consider a valid zone to be at least 80% of unsaturated cells in it. This value could very well be configurable, and make the algorithm more or less tolerant. While at it, implement it in a configure() call as it will not change during execution, and cache the cellsPerZone values estimated with std::round as we are using cmath. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-06ipa: ipu3: Change limits and split loops in calculateBdsGrid()Jean-Michel Hautbois
The loops over the width and height of the image when calculating the BDS grid parameters are nested, but they're actually independent. Split them to reduce the complexity. While at it, split out the constants to documented const expressions for the grid sizes. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-06ipa: ipu3: Change the limits of the AWB statsJean-Michel Hautbois
Until now, the limits used to calculate the grid based on the Bayer Down Scaler configuration where taken from the kernel documentation [0]. While testing and understanding the format of the ImgU statistics, it appears that the ones defined in CrOS [1] are the correct ones. Use those. [0] https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/pixfmt-meta-intel-ipu3.html?highlight=v4l2_meta_fmt_ipu3_params#intel-ipu3-imgu-uapi-data-types [1] https://chromium.googlesource.com/chromiumos/platform/arc-camera/+/refs/heads/master/hal/intel/include/ia_imaging/awb_public.h Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-06ipa: ipu3: awb: Make the naming consistentJean-Michel Hautbois
The variables mix the terms cell, region and zone. It can confuse the reader, and make the algorithm more difficult to follow. Rename the local variables to be consistent with their definitions: - Cells are defined in Pixels - Zones are defined in Cells There is no "region" as such, so replace it with the correct term. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2021-10-06ipa: ipu3: Change Accumulator structure layoutJean-Michel Hautbois
The pixel component sums for the Accumulator are inconsistent with other similar structures such as the IPAFrameContext::awb::gains. Group the red, green, and blue sums together in a struct and store them as uint64_t to reduce potential architectural differences. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>