[PATCH v4 0/6] ipa: simple: Introduce metadata reporting

[Milan Zamazal]

Provide metadata reporting for the software ISP.  This means reporting
metadata itself from software ISP and adding relevant values to the
metadata.

Running ‘cam’ with --metadata now produces something like the following:

  SensorBlackLevels = [ 4096, 4096, 4096, 4096 ]
  ColourGains = [ 0.001153, 0.001145 ]
  ExposureTime = 66578
  AnalogueGain = 10.666667
  SensorTimestamp = 5466162537000

Changes in v4:
- SimpleCameraData::completeRequest just returns if frame info is not
  found.
- SimpleCameraData::completeRequest split to completeRequest and
  tryCompleteRequest and checkCompleted argument removed.
- SoftwareIsp::saveMetadata replaced by a lambda function.
- blackLevels array initialization reflowed to 72 columns.
- exposureTime converted to the right unit.
- maybe_unused removed from a used argument.
- Metadata is taken from frame contexts rather than from active states.

Changes in v3:
- Don't use dynamic allocation for SimpleFrames entries.
- A tentative patch to add exposure/gain to metadata.

Changes in v2:
- Taken over from Kieran.
- Updated for master.
- Black level is reported as uint16_t, according to the control
  documentation.
- Contrast value is reported in metadata.
- The metadata used to proces the image is reported rather than the
  metadata determined from the image.
- Metadata is reported using a new signal rather than (ab)using
  setIspParams; this change is less or more needed due to changed simple
  IPA structure since v1.
- Frame -> request mapping is introduced to make sure the metadata is
  assigned to the right request.

Kieran Bingham (3):
  ipa: simple: softisp: Extend to pass metadata
  ipa: simple: Report the ColourGains in metadata
  ipa: simple: Report black levels in metadata

Milan Zamazal (3):
  libcamera: software_isp: Track frames and requests
  ipa: simple: Report contrast in metadata
  ipa: simple: Report exposure in metadata

 .../internal/software_isp/software_isp.h      |   2 +
 include/libcamera/ipa/soft.mojom              |   4 +-
 src/ipa/simple/algorithms/agc.cpp             |  11 +-
 src/ipa/simple/algorithms/awb.cpp             |  23 +++-
 src/ipa/simple/algorithms/awb.h               |   6 +-
 src/ipa/simple/algorithms/blc.cpp             |  11 +-
 src/ipa/simple/algorithms/lut.cpp             |  17 ++-
 src/ipa/simple/algorithms/lut.h               |   5 +
 src/ipa/simple/ipa_context.h                  |  11 +-
 src/ipa/simple/soft_simple.cpp                |  24 ++--
 src/libcamera/pipeline/simple/simple.cpp      | 116 +++++++++++++++++-
 src/libcamera/software_isp/software_isp.cpp   |  27 +++-
 12 files changed, 227 insertions(+), 30 deletions(-)

-- 
2.48.1