Camera2 API support?

Technical Support
1

Does the Kompact allow use of Camera2 API? A yes means that could (perhaps) also run Open-Camera-Sensors.

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Manual focus possible? - yes, found it
3

I’m not sure what that means. Is that an app?

4

No.

API = Application Programming Interface

I recieved this reply in email, which may help:

“Yes to Camera2, but not to the part of Open Camera Sensors that matters.

Checked on a Kompakt (Android 12, API 31). The camera reports:

  • Hardware level: FULL

  • Capabilities: BACKWARD_COMPATIBLE, MANUAL_SENSOR, MANUAL_POST_PROCESSING,
    READ_SENSOR_SETTINGS

  • SYNC_MAX_LATENCY: PER_FRAME_CONTROL

  • Exposure 100 us - 400 ms, ISO 100-2400

  • One camera, rear only - 3264x2448 stills, 1080p30 video, no RAW

  • SENSOR_INFO_TIMESTAMP_SOURCE: UNKNOWN

Full Camera2 with manual sensor control and per-frame control, which is better
than most e-ink phones manage. But that last line is the blocker. Open Camera
Sensors gates camera-IMU synchronisation on exactly one thing:

public boolean supportsVideoImuSync() {
    Integer source = characteristics.get(
        CameraCharacteristics.SENSOR_INFO_TIMESTAMP_SOURCE);
    return source != null
        && source == CameraMetadata.SENSOR_INFO_TIMESTAMP_SOURCE_REALTIME;
}

UNKNOWN isn’t REALTIME, so that returns false. Frame timestamps don’t share a
clock with SensorEvent.timestamp, and there’s no fixed offset to correct for -
which is the whole point of the fork. RecSync is out for the same reason. Their
README is upfront about it: “Smartphones are required to support real-time
timestamping to be correctly synchronized.”

I installed it anyway (v1.48.3.1, package com.opencamera_sensors.app - it
coexists with regular Open Camera). Preview and manual controls work fine.
Settings crashes with an NPE at MyPreferenceFragment.java:895, on the branch you
only reach if the device passes the Camera2 check, so it’s devices like this one
that trip it.

The IMU itself is fine - gyro to 400 Hz, accel to 200 Hz, both with a
4500-event FIFO. It’s the clock that’s missing, not the sensors.”

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5

@notyet I will have to ask our team about this because I honestly don’t know.

6

UPDATE: I spoke to the team & they said YES, Mudita Kompakt supports the Camera2 API, and it is already being used successfully by Mudita’s own software. However, not every Camera2 feature or capability is guaranteed to work.

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