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ipa: raspberrypi: Move initial frame drop decision to AGC/AWB

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Previously the CamHelper was returning the number of frames to drop
(on account of AGC/AWB converging). This wasn't really appropriate,
it's better for the algorithms to do it as they know how many frames
they might need.

The CamHelper::HideFramesStartup method should now just be returning
the number of frames to hide because they're bad/invalid in some way,
not worrying about the AGC/AWB. For many sensors, the correct value
for this is zero. But the ov5647 needs updating as it must return 2.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
David Plowman 2020-12-08 20:44:41 +00:00 • committed by Laurent Pinchart
parent 4cd283acd0
commit aaeee427b0
3 changed files with 41 additions and 3 deletions
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10
src/ipa/raspberrypi/cam_helper_ov5647.cpp
View file

@ -19,6 +19,7 @@ public:
uint32_t GainCode(double gain) const override;
double Gain(uint32_t gain_code) const override;
void GetDelays(int &exposure_delay, int &gain_delay) const override;
unsigned int HideFramesStartup() const override;
unsigned int HideFramesModeSwitch() const override;
unsigned int MistrustFramesStartup() const override;
unsigned int MistrustFramesModeSwitch() const override;
@ -54,6 +55,15 @@ void CamHelperOv5647::GetDelays(int &exposure_delay, int &gain_delay) const
gain_delay = 2;
}
unsigned int CamHelperOv5647::HideFramesStartup() const
{
/*
* On startup, we get a couple of under-exposed frames which
* we don't want shown.
*/
return 2;
}
unsigned int CamHelperOv5647::HideFramesModeSwitch() const
{
/*