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Diffstat (limited to 'src/ipa/raspberrypi/cam_helper_ov5647.cpp')
-rw-r--r--src/ipa/raspberrypi/cam_helper_ov5647.cpp89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/ipa/raspberrypi/cam_helper_ov5647.cpp b/src/ipa/raspberrypi/cam_helper_ov5647.cpp
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * cam_helper_ov5647.cpp - camera information for ov5647 sensor
+ */
+
+#include <assert.h>
+
+#include "cam_helper.hpp"
+#include "md_parser_rpi.hpp"
+
+using namespace RPi;
+
+class CamHelperOv5647 : public CamHelper
+{
+public:
+ CamHelperOv5647();
+ 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 HideFramesModeSwitch() const override;
+ unsigned int MistrustFramesStartup() const override;
+ unsigned int MistrustFramesModeSwitch() const override;
+};
+
+/*
+ * OV5647 doesn't output metadata, so we have to use the "unicam parser" which
+ * works by counting frames.
+ */
+
+CamHelperOv5647::CamHelperOv5647()
+ : CamHelper(new MdParserRPi())
+{
+}
+
+uint32_t CamHelperOv5647::GainCode(double gain) const
+{
+ return static_cast<uint32_t>(gain * 16.0);
+}
+
+double CamHelperOv5647::Gain(uint32_t gain_code) const
+{
+ return static_cast<double>(gain_code) / 16.0;
+}
+
+void CamHelperOv5647::GetDelays(int &exposure_delay, int &gain_delay) const
+{
+ /*
+ * We run this sensor in a mode where the gain delay is bumped up to
+ * 2. It seems to be the only way to make the delays "predictable".
+ */
+ exposure_delay = 2;
+ gain_delay = 2;
+}
+
+unsigned int CamHelperOv5647::HideFramesModeSwitch() const
+{
+ /*
+ * After a mode switch, we get a couple of under-exposed frames which
+ * we don't want shown.
+ */
+ return 2;
+}
+
+unsigned int CamHelperOv5647::MistrustFramesStartup() const
+{
+ /*
+ * First couple of frames are under-exposed and are no good for control
+ * algos.
+ */
+ return 2;
+}
+
+unsigned int CamHelperOv5647::MistrustFramesModeSwitch() const
+{
+ /*
+ * First couple of frames are under-exposed even after a simple
+ * mode switch, and are no good for control algos.
+ */
+ return 2;
+}
+
+static CamHelper *Create()
+{
+ return new CamHelperOv5647();
+}
+
+static RegisterCamHelper reg("ov5647", &Create);