[libcamera-devel] [PATCH] android: capabilities: Add static white level

[Paul Elder]

Plumb SENSOR_INFO_WHITE_LEVEL into the static metadata. Get the
information from the maximum bit depth raw format supported by the
sensor. Since we hardcode accept only 16-bit raw formats, take that
hardcoded value. While at it, save the hardcoded value in a variable so
that if it is changed in the future this gets updated automatically.

Note that nothing is added to the capability detector, as white level
will always be added to the static metadata. Add a comment to document
it.

Bug: https://bugs.libcamera.org/show_bug.cgi?id=49
Signed-off-by: Paul Elder <paul.elder at ideasonboard.com>
---
 src/android/camera_capabilities.cpp | 9 ++++++++-
 src/android/camera_capabilities.h   | 1 +
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/android/camera_capabilities.cpp b/src/android/camera_capabilities.cpp
index d5e79057..bc62a928 100644
--- a/src/android/camera_capabilities.cpp
+++ b/src/android/camera_capabilities.cpp
@@ -447,6 +447,7 @@ int CameraCapabilities::initialize(std::shared_ptr<Camera> camera,
 	orientation_ = orientation;
 	facing_ = facing;
 	minISO_ = minISO;
+	rawBitDepth_ = 16;
 	rawStreamAvailable_ = false;
 	maxFrameDuration_ = 0;
 
@@ -667,7 +668,7 @@ int CameraCapabilities::initializeStreamConfigurations()
 		const PixelFormatInfo &info = PixelFormatInfo::info(mappedFormat);
 		switch (info.colourEncoding) {
 		case PixelFormatInfo::ColourEncodingRAW:
-			if (info.bitsPerPixel != 16)
+			if (info.bitsPerPixel != rawBitDepth_)
 				continue;
 
 			rawStreamAvailable_ = true;
@@ -1335,6 +1336,12 @@ int CameraCapabilities::initializeStaticMetadata()
 	staticMetadata_->addEntry(ANDROID_SENSOR_INFO_MAX_FRAME_DURATION,
 				  maxFrameDuration_);
 
+	/* This is required for FULL. */
+	int whiteLevel = (1 << rawBitDepth_) - 1;
+	staticMetadata_->addEntry(ANDROID_SENSOR_INFO_WHITE_LEVEL,
+				  whiteLevel);
+	availableCharacteristicsKeys_.insert(ANDROID_SENSOR_INFO_WHITE_LEVEL);
+
 	/* Statistics static metadata. */
 	uint8_t faceDetectMode = ANDROID_STATISTICS_FACE_DETECT_MODE_OFF;
 	staticMetadata_->addEntry(ANDROID_STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES,
diff --git a/src/android/camera_capabilities.h b/src/android/camera_capabilities.h
index 7f554c63..2e6595fb 100644
--- a/src/android/camera_capabilities.h
+++ b/src/android/camera_capabilities.h
@@ -71,6 +71,7 @@ private:
 	int facing_;
 	int orientation_;
 	int minISO_;
+	unsigned int rawBitDepth_;
 	bool rawStreamAvailable_;
 	int64_t maxFrameDuration_;
 	camera_metadata_enum_android_info_supported_hardware_level hwLevel_;
-- 
2.27.0