From ca3bb6ddf5307537aa05e43d3ec1ff7ffdc0efed Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Thu, 7 Dec 2023 13:30:27 +0100
Subject: [PATCH 07/25] libcamera: software_isp: Add SwStats base class
Add a virtual base class for CPU based software statistics gathering
implementations.
The idea is for the implementations to offer a configure function +
functions to gather statistics on a line by line basis. This allows
CPU based software debayering to call into interlace debayering and
statistics gathering on a line by line bases while the input data
is still hot in the cache.
This base class also allows the user of an implementation to specify
a window over which to gather statistics instead of processing the
whole frame; and it allows the implementation to choose to only
process 1/2, 1/4th, etc. of the lines instead of processing all
lines (in the window) by setting y_skip_mask_ from configure().
Skipping columns is left up the line-processing functions provided
by the implementation.
Doxygen documentation by Dennis Bonke.
Co-authored-by: Dennis Bonke <admin@dennisbonke.com>
Signed-off-by: Dennis Bonke <admin@dennisbonke.com>
Co-authored-by: Andrey Konovalov <andrey.konovalov@linaro.org>
Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> # sc8280xp Lenovo x13s
Tested-by: Pavel Machek <pavel@ucw.cz>
---
include/libcamera/internal/meson.build | 1 +
.../internal/software_isp/meson.build | 6 +
.../internal/software_isp/swisp_stats.h | 34 +++
.../libcamera/internal/software_isp/swstats.h | 215 ++++++++++++++++++
src/libcamera/meson.build | 1 +
src/libcamera/software_isp/meson.build | 5 +
src/libcamera/software_isp/swstats.cpp | 22 ++
7 files changed, 284 insertions(+)
create mode 100644 include/libcamera/internal/software_isp/meson.build
create mode 100644 include/libcamera/internal/software_isp/swisp_stats.h
create mode 100644 include/libcamera/internal/software_isp/swstats.h
create mode 100644 src/libcamera/software_isp/meson.build
create mode 100644 src/libcamera/software_isp/swstats.cpp
diff --git a/include/libcamera/internal/meson.build b/include/libcamera/internal/meson.build
index 1325941d..caa533c4 100644
--- a/include/libcamera/internal/meson.build
+++ b/include/libcamera/internal/meson.build
@@ -51,3 +51,4 @@ libcamera_internal_headers = files([
])
subdir('converter')
+subdir('software_isp')
diff --git a/include/libcamera/internal/software_isp/meson.build b/include/libcamera/internal/software_isp/meson.build
new file mode 100644
index 00000000..1c43acc4
--- /dev/null
+++ b/include/libcamera/internal/software_isp/meson.build
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: CC0-1.0
+
+libcamera_internal_headers += files([
+ 'swisp_stats.h',
+ 'swstats.h',
+])
diff --git a/include/libcamera/internal/software_isp/swisp_stats.h b/include/libcamera/internal/software_isp/swisp_stats.h
new file mode 100644
index 00000000..07ba7d6a
--- /dev/null
+++ b/include/libcamera/internal/software_isp/swisp_stats.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2023, Linaro Ltd
+ *
+ * swisp_stats.h - Statistics data format used by the software ISP and software IPA
+ */
+
+#pragma once
+
+namespace libcamera {
+
+/**
+ * \brief Struct that holds the statistics for the Software ISP.
+ */
+struct SwIspStats {
+ /**
+ * \brief Holds the sum of all sampled red pixels.
+ */
+ unsigned long sumR_;
+ /**
+ * \brief Holds the sum of all sampled green pixels.
+ */
+ unsigned long sumG_;
+ /**
+ * \brief Holds the sum of all sampled blue pixels.
+ */
+ unsigned long sumB_;
+ /**
+ * \brief A histogram of luminance values.
+ */
+ unsigned int y_histogram[16];
+};
+
+} /* namespace libcamera */
diff --git a/include/libcamera/internal/software_isp/swstats.h b/include/libcamera/internal/software_isp/swstats.h
new file mode 100644
index 00000000..dcac7064
--- /dev/null
+++ b/include/libcamera/internal/software_isp/swstats.h
@@ -0,0 +1,215 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2023, Linaro Ltd
+ * Copyright (C) 2023, Red Hat Inc.
+ *
+ * Authors:
+ * Hans de Goede <hdegoede@redhat.com>
+ *
+ * swstats.h - software statistics base class
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+#include <libcamera/base/log.h>
+#include <libcamera/base/signal.h>
+
+#include <libcamera/geometry.h>
+
+namespace libcamera {
+
+class PixelFormat;
+struct SharedFD;
+struct StreamConfiguration;
+
+LOG_DECLARE_CATEGORY(SwStats)
+
+/**
+ * \class SwStats
+ * \brief Base class for the software ISP statistics.
+ *
+ * Base class for the software ISP statistics.
+ */
+class SwStats
+{
+public:
+ virtual ~SwStats() = 0;
+
+ /**
+ * \brief Gets wether the statistics object is valid.
+ *
+ * \return true if it's valid, false otherwise.
+ */
+ virtual bool isValid() const = 0;
+
+ /**
+ * \brief Configure the statistics object for the passed in input format.
+ * \param[in] inputCfg The input format
+ *
+ * \return 0 on success, a negative errno value on failure.
+ */
+ virtual int configure(const StreamConfiguration &inputCfg) = 0;
+
+ /**
+ * \brief Get the file descriptor for the statistics.
+ *
+ * \return the file descriptor
+ */
+ virtual const SharedFD &getStatsFD() = 0;
+
+protected:
+ /**
+ * \brief Called when there is data to get statistics from.
+ * \param[in] src The input data
+ */
+ typedef void (SwStats::*statsProcessFn)(const uint8_t *src[]);
+ /**
+ * \brief Called when the statistics gathering is done or when a new frame starts.
+ */
+ typedef void (SwStats::*statsVoidFn)();
+
+ /* Variables set by configure(), used every line */
+ /**
+ * \brief The function called when a line is ready for statistics processing.
+ *
+ * Used for line 0 and 1, repeating if there isn't a 3rd and a 4th line in the bayer order.
+ */
+ statsProcessFn stats0_;
+ /**
+ * \brief The function called when a line is ready for statistics processing.
+ *
+ * Used for line 3 and 4, only needed if the bayer order has 4 different lines.
+ */
+ statsProcessFn stats2_;
+
+ /**
+ * \brief The memory used per pixel in bits.
+ */
+ unsigned int bpp_;
+ /**
+ * \brief Skip lines where this bitmask is set in y.
+ */
+ unsigned int y_skip_mask_;
+
+ /**
+ * \brief Statistics window, set by setWindow(), used ever line.
+ */
+ Rectangle window_;
+
+ /**
+ * \brief The function called at the start of a frame.
+ */
+ statsVoidFn startFrame_;
+ /**
+ * \brief The function called at the end of a frame.
+ */
+ statsVoidFn finishFrame_;
+ /**
+ * \brief The size of the bayer pattern.
+ */
+ Size patternSize_;
+ /**
+ * \brief The offset of x, applied to window_.x for bayer variants.
+ *
+ * This can either be 0 or 1.
+ */
+ unsigned int x_shift_;
+
+public:
+ /**
+ * \brief Get the pattern size.
+ *
+ * For some input-formats, e.g. Bayer data, processing is done multiple lines
+ * and/or columns at a time. Get width and height at which the (bayer) pattern
+ * repeats. Window values are rounded down to a multiple of this and the height
+ * also indicates if processLine2() should be called or not.
+ * This may only be called after a successful configure() call.
+ *
+ * \return the pattern size.
+ */
+ const Size &patternSize() { return patternSize_; }
+
+ /**
+ * \brief Specify window coordinates over which to gather statistics.
+ * \param[in] window The window object.
+ */
+ void setWindow(Rectangle window)
+ {
+ window_ = window;
+
+ window_.x &= ~(patternSize_.width - 1);
+ window_.x += x_shift_;
+ window_.y &= ~(patternSize_.height - 1);
+
+ /* width_ - x_shift_ to make sure the window fits */
+ window_.width -= x_shift_;
+ window_.width &= ~(patternSize_.width - 1);
+ window_.height &= ~(patternSize_.height - 1);
+ }
+
+ /**
+ * \brief Reset state to start statistics gathering for a new frame.
+ *
+ * This may only be called after a successful setWindow() call.
+ */
+ void startFrame()
+ {
+ (this->*startFrame_)();
+ }
+
+ /**
+ * \brief Process line 0.
+ * \param[in] y The y coordinate.
+ * \param[in] src The input data.
+ *
+ * This function processes line 0 for input formats with patternSize height == 1.
+ * It'll process line 0 and 1 for input formats with patternSize height >= 2.
+ * This function may only be called after a successful setWindow() call.
+ */
+ void processLine0(unsigned int y, const uint8_t *src[])
+ {
+ if ((y & y_skip_mask_) || y < (unsigned int)window_.y ||
+ y >= (window_.y + window_.height))
+ return;
+
+ (this->*stats0_)(src);
+ }
+
+ /**
+ * \brief Process line 2 and 3.
+ * \param[in] y The y coordinate.
+ * \param[in] src The input data.
+ *
+ * This function processes line 2 and 3 for input formats with patternSize height == 4.
+ * This function may only be called after a successful setWindow() call.
+ */
+ void processLine2(unsigned int y, const uint8_t *src[])
+ {
+ if ((y & y_skip_mask_) || y < (unsigned int)window_.y ||
+ y >= (window_.y + window_.height))
+ return;
+
+ (this->*stats2_)(src);
+ }
+
+ /**
+ * \brief Finish statistics calculation for the current frame.
+ *
+ * This may only be called after a successful setWindow() call.
+ */
+ void finishFrame()
+ {
+ (this->*finishFrame_)();
+ }
+
+ /**
+ * \brief Signals that the statistics are ready.
+ *
+ * The int parameter isn't actually used.
+ */
+ Signal<int> statsReady;
+};
+
+} /* namespace libcamera */
diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index 86494663..3d63e8a2 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -71,6 +71,7 @@ subdir('converter')
subdir('ipa')
subdir('pipeline')
subdir('proxy')
+subdir('software_isp')
null_dep = dependency('', required : false)
diff --git a/src/libcamera/software_isp/meson.build b/src/libcamera/software_isp/meson.build
new file mode 100644
index 00000000..9359075d
--- /dev/null
+++ b/src/libcamera/software_isp/meson.build
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
+libcamera_sources += files([
+ 'swstats.cpp',
+])
diff --git a/src/libcamera/software_isp/swstats.cpp b/src/libcamera/software_isp/swstats.cpp
new file mode 100644
index 00000000..e65a7ada
--- /dev/null
+++ b/src/libcamera/software_isp/swstats.cpp
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2023, Linaro Ltd
+ * Copyright (C) 2023, Red Hat Inc.
+ *
+ * Authors:
+ * Hans de Goede <hdegoede@redhat.com>
+ *
+ * swstats.cpp - software statistics base class
+ */
+
+#include "libcamera/internal/software_isp/swstats.h"
+
+namespace libcamera {
+
+LOG_DEFINE_CATEGORY(SwStats)
+
+SwStats::~SwStats()
+{
+}
+
+} /* namespace libcamera */
--
2.43.0
