libcamera: camera_sensor: Define CameraSensorInfo

Define the CameraSensorInfo structure that reports the current image sensor
configuration.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/camera_sensor.cpp

@@ -29,6 +29,87 @@ namespace libcamera {
 
 LOG_DEFINE_CATEGORY(CameraSensor);
 
+/**
+ * \struct CameraSensorInfo
+ * \brief Report the image sensor characteristics
+ *
+ * The structure reports image sensor characteristics used by IPA modules to
+ * tune their algorithms based on the image sensor model currently in use and
+ * its configuration.
+ *
+ * The reported information describes the sensor's intrinsics characteristics,
+ * such as its pixel array size and the sensor model name, as well as
+ * information relative to the currently configured mode, such as the produced
+ * image size and the bit depth of the requested image format.
+ *
+ * Instances of this structure are meant to be assembled by the CameraSensor
+ * class by inspecting the sensor static properties as well as information
+ * relative to the current configuration.
+ */
+
+/**
+ * \var CameraSensorInfo::model
+ * \brief The image sensor model name
+ *
+ * The sensor model name is a free-formed string that uniquely identifies the
+ * sensor model.
+ */
+
+/**
+ * \var CameraSensorInfo::bitsPerPixel
+ * \brief The number of bits per pixel of the image format produced by the
+ * image sensor
+ */
+
+/**
+ * \var CameraSensorInfo::activeAreaSize
+ * \brief The size of the pixel array active area of the sensor
+ */
+
+/**
+ * \var CameraSensorInfo::analogCrop
+ * \brief The portion of the pixel array active area which is read-out and
+ * processed
+ *
+ * The analog crop rectangle top-left corner is defined as the displacement
+ * from the top-left corner of the pixel array active area. The rectangle
+ * horizontal and vertical sizes define the portion of the pixel array which
+ * is read-out and provided to the sensor's internal processing pipeline, before
+ * any pixel sub-sampling method, such as pixel binning, skipping and averaging
+ * take place.
+ */
+
+/**
+ * \var CameraSensorInfo::outputSize
+ * \brief The size of the images produced by the camera sensor
+ *
+ * The output image size defines the horizontal and vertical sizes of the images
+ * produced by the image sensor. The output image size is defined as the end
+ * result of the sensor's internal image processing pipeline stages, applied on
+ * the pixel array portion defined by the analog crop rectangle. Each image
+ * processing stage that performs pixel sub-sampling techniques, such as pixel
+ * binning or skipping, or perform any additional digital scaling concur in the
+ * definition of the output image size.
+ */
+
+/**
+ * \var CameraSensorInfo::pixelRate
+ * \brief The number of pixels produced in a second
+ *
+ * To obtain the read-out time in seconds of a full line:
+ *
+ * \verbatim
+	lineDuration(s) = lineLength(pixels) / pixelRate(pixels per second)
+   \endverbatim
+ */
+
+/**
+ * \var CameraSensorInfo::lineLength
+ * \brief Total line length in pixels
+ *
+ * The total line length in pixel clock periods, including blanking.
+ */
+
 /**
  * \class CameraSensor
  * \brief A camera sensor based on V4L2 subdevices

src/libcamera/include/camera_sensor.h

@@ -22,6 +22,19 @@ class V4L2Subdevice;
 
 struct V4L2SubdeviceFormat;
 
+struct CameraSensorInfo {
+	std::string model;
+
+	uint32_t bitsPerPixel;
+
+	Size activeAreaSize;
+	Rectangle analogCrop;
+	Size outputSize;
+
+	uint64_t pixelRate;
+	uint32_t lineLength;
+};
+
 class CameraSensor : protected Loggable
 {
 public: