diff options
Diffstat (limited to 'src/ipa')
| -rw-r--r-- | src/ipa/raspberrypi/cam_helper_imx477.cpp | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/ipa/raspberrypi/cam_helper_imx477.cpp b/src/ipa/raspberrypi/cam_helper_imx477.cpp index 91d05d92..338fdc0c 100644 --- a/src/ipa/raspberrypi/cam_helper_imx477.cpp +++ b/src/ipa/raspberrypi/cam_helper_imx477.cpp @@ -6,14 +6,23 @@ */ #include <assert.h> +#include <cmath> #include <stddef.h> #include <stdio.h> #include <stdlib.h> +#include <libcamera/base/log.h> + #include "cam_helper.hpp" #include "md_parser.hpp" using namespace RPiController; +using namespace libcamera; +using libcamera::utils::Duration; + +namespace libcamera { +LOG_DECLARE_CATEGORY(IPARPI) +} /* * We care about two gain registers and a pair of exposure registers. Their @@ -34,6 +43,9 @@ public: CamHelperImx477(); uint32_t GainCode(double gain) const override; double Gain(uint32_t gain_code) const override; + void Prepare(libcamera::Span<const uint8_t> buffer, Metadata &metadata) override; + uint32_t GetVBlanking(Duration &exposure, Duration minFrameDuration, + Duration maxFrameDuration) const override; void GetDelays(int &exposure_delay, int &gain_delay, int &vblank_delay) const override; bool SensorEmbeddedDataPresent() const override; @@ -44,6 +56,10 @@ private: * in units of lines. */ static constexpr int frameIntegrationDiff = 22; + /* Maximum frame length allowable for long exposure calculations. */ + static constexpr int frameLengthMax = 0xffdc; + /* Largest long exposure scale factor given as a left shift on the frame length. */ + static constexpr int longExposureShiftMax = 7; void PopulateMetadata(const MdParser::RegisterMap ®isters, Metadata &metadata) const override; @@ -64,6 +80,76 @@ double CamHelperImx477::Gain(uint32_t gain_code) const return 1024.0 / (1024 - gain_code); } +void CamHelperImx477::Prepare(libcamera::Span<const uint8_t> buffer, Metadata &metadata) +{ + MdParser::RegisterMap registers; + DeviceStatus deviceStatus; + + if (metadata.Get("device.status", deviceStatus)) { + LOG(IPARPI, Error) << "DeviceStatus not found from DelayedControls"; + return; + } + + parseEmbeddedData(buffer, metadata); + + /* + * The DeviceStatus struct is first populated with values obtained from + * DelayedControls. If this reports frame length is > frameLengthMax, + * it means we are using a long exposure mode. Since the long exposure + * scale factor is not returned back through embedded data, we must rely + * on the existing exposure lines and frame length values returned by + * DelayedControls. + * + * Otherwise, all values are updated with what is reported in the + * embedded data. + */ + if (deviceStatus.frame_length > frameLengthMax) { + DeviceStatus parsedDeviceStatus; + + metadata.Get("device.status", parsedDeviceStatus); + parsedDeviceStatus.shutter_speed = deviceStatus.shutter_speed; + parsedDeviceStatus.frame_length = deviceStatus.frame_length; + metadata.Set("device.status", parsedDeviceStatus); + + LOG(IPARPI, Debug) << "Metadata updated for long exposure: " + << parsedDeviceStatus; + } +} + +uint32_t CamHelperImx477::GetVBlanking(Duration &exposure, + Duration minFrameDuration, + Duration maxFrameDuration) const +{ + uint32_t frameLength, exposureLines; + unsigned int shift = 0; + + frameLength = mode_.height + CamHelper::GetVBlanking(exposure, minFrameDuration, + maxFrameDuration); + /* + * Check if the frame length calculated needs to be setup for long + * exposure mode. This will require us to use a long exposure scale + * factor provided by a shift operation in the sensor. + */ + while (frameLength > frameLengthMax) { + if (++shift > longExposureShiftMax) { + shift = longExposureShiftMax; + frameLength = frameLengthMax; + break; + } + frameLength >>= 1; + } + + if (shift) { + /* Account for any rounding in the scaled frame length value. */ + frameLength <<= shift; + exposureLines = ExposureLines(exposure); + exposureLines = std::min(exposureLines, frameLength - frameIntegrationDiff); + exposure = Exposure(exposureLines); + } + + return frameLength - mode_.height; +} + void CamHelperImx477::GetDelays(int &exposure_delay, int &gain_delay, int &vblank_delay) const { |