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ipa: raspberrypi: agc: Add GetConvergenceFrames method to AGC base class

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We add a GetConvergenceFrames method to the AgcAlgorithm class which
can be called when the AGC is started from scratch. It suggests how
many frames should be dropped before displaying any (while the AGC
converges).

The Raspberry Pi specific implementation makes this customisable from
the tuning file.

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 20:44:37 +00:00 • committed by Laurent Pinchart
parent 10bcc51ca3
commit 748f48a006
3 changed files with 14 additions and 0 deletions
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11
src/ipa/raspberrypi/controller/rpi/agc.cpp
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@ -142,6 +142,7 @@ void AgcConfig::Read(boost::property_tree::ptree const &params)
Y_target.Read(params.get_child("y_target"));
speed = params.get<double>("speed", 0.2);
startup_frames = params.get<uint16_t>("startup_frames", 10);
convergence_frames = params.get<unsigned int>("convergence_frames", 6);
fast_reduce_threshold =
params.get<double>("fast_reduce_threshold", 0.4);
base_ev = params.get<double>("base_ev", 1.0);
@ -206,6 +207,16 @@ void Agc::Resume()
fixed_analogue_gain_ = 0;
}
unsigned int Agc::GetConvergenceFrames() const
{
// If shutter and gain have been explicitly set, there is no
// convergence to happen, so no need to drop any frames - return zero.
if (fixed_shutter_ && fixed_analogue_gain_)
return 0;
else
return config_.convergence_frames;
}
void Agc::SetEv(double ev)
{
ev_ = ev;