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Diffstat (limited to 'src/ipa/ipu3/algorithms/af.h')
| -rw-r--r-- | src/ipa/ipu3/algorithms/af.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/ipa/ipu3/algorithms/af.h b/src/ipa/ipu3/algorithms/af.h new file mode 100644 index 00000000..13c7e0e8 --- /dev/null +++ b/src/ipa/ipu3/algorithms/af.h @@ -0,0 +1,79 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/* + * Copyright (C) 2021, Red Hat + * + * af.h - IPU3 Af algorithm + */ + +#pragma once + +#include <linux/intel-ipu3.h> + +#include <libcamera/base/utils.h> + +#include <libcamera/geometry.h> + +#include "algorithm.h" + +/* Static variables from repo of chromium */ +static constexpr uint8_t kAfMinGridWidth = 16; +static constexpr uint8_t kAfMinGridHeight = 16; +static constexpr uint8_t kAfMaxGridWidth = 32; +static constexpr uint8_t kAfMaxGridHeight = 24; +static constexpr uint16_t kAfMinGridBlockWidth = 4; +static constexpr uint16_t kAfMinGridBlockHeight = 3; +static constexpr uint16_t kAfMaxGridBlockWidth = 6; +static constexpr uint16_t kAfMaxGridBlockHeight = 6; +static constexpr uint16_t kAfDefaultHeightPerSlice = 2; + +namespace libcamera { + +namespace ipa::ipu3::algorithms { + +class Af : public Algorithm +{ + /* The format of y_table. From ipu3-ipa repo */ + typedef struct __attribute__((packed)) y_table_item { + uint16_t y1_avg; + uint16_t y2_avg; + } y_table_item_t; +public: + Af(); + ~Af() = default; + + void prepare(IPAContext &context, ipu3_uapi_params *params) override; + int configure(IPAContext &context, const IPAConfigInfo &configInfo) override; + void process(IPAContext &context, const ipu3_uapi_stats_3a *stats) override; + +private: + void afCoarseScan(IPAContext &context); + void afFineScan(IPAContext &context); + bool afScan(IPAContext &context, int min_step); + void afReset(IPAContext &context); + bool afNeedIgnoreFrame(); + void afIgnoreFrameReset(); + double afEstimateVariance(y_table_item_t *y_item, uint32_t len, + bool isY1); + bool afIsOutOfFocus(IPAContext context); + + /* VCM step configuration. It is the current setting of the VCM step. */ + uint32_t focus_; + /* The best VCM step. It is a local optimum VCM step during scanning. */ + uint32_t bestFocus_; + /* Current AF statistic variance. */ + double currentVariance_; + /* The frames are ignore before starting measuring. */ + uint32_t ignoreCounter_; + /* It is used to determine the derivative during scanning */ + double previousVariance_; + /* The designated maximum range of focus scanning. */ + uint32_t maxStep_; + /* If the coarse scan completes, it is set to true. */ + bool coarseCompleted_; + /* If the fine scan completes, it is set to true. */ + bool fineCompleted_; +}; + +} /* namespace ipa::ipu3::algorithms */ + +} /* namespace libcamera */ |