CODEWITHSUNDEEP
androidandroid-camera2
bazinac
bazinac

Reputation: 668

Android Camera2: CONTROL_AF_STATE always 0 for CONTROL_AF_MODE_MACRO

I am trying to detect when camera has focused (or has stopped trying to) so I am calling result.get(CaptureResult.CONTROL_AF_STATE)in onCaptureCompleted method of callback.

It kind of works for mode AF_MODE_CONTINUOUS_PICTURE, camera reports CONTROL_AF_STATE 1 or 2 (CONTROL_AF_STATE_PASSIVE_SCAN or CONTROL_AF_STATE_PASSIVE_LOCKED), which is nice.

However when camera is switched to AF_MODE_MACRO, then reported CONTROL_AF_STATE is always 0 (INNACTIVE) no matter what happens. I was trying to refer to 1 but probably I do not get it right.

Further info: when changing modes between AF_MODE_MACRO and AF_MODE_CONTINUOUS_PICTURE I always start new capture session like this:

private void configCaptureSession(boolean macroModeNew) {
this.macroMode = macroModeNew;
try {
  // Wanna macro?
  if (macroMode) {
    LOGGER.d( "MACRO ON","");
    previewRequestBuilder.set(
            CaptureRequest.CONTROL_AF_MODE,CaptureRequest.CONTROL_AF_MODE_MACRO);
    }

  else {
    // Continuous AF
    LOGGER.d( "MACRO OFF","");
    previewRequestBuilder.set(
            CaptureRequest.CONTROL_AF_MODE,CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);

  }

  // Finally, we start displaying the camera preview.
  previewRequest = previewRequestBuilder.build();
  LOGGER.d( "SETTING NEW SESSION","");

  captureSession.setRepeatingRequest(
      previewRequest, captureCallback, backgroundHandler);

} catch (final CameraAccessException e) {
  LOGGER.e(e, "Exception!");
}

}

captureCallback:

 private final CameraCaptureSession.CaptureCallback captureCallback =
  new CameraCaptureSession.CaptureCallback() {
    @Override
    public void onCaptureProgressed(
        final CameraCaptureSession session,
        final CaptureRequest request,
        final CaptureResult partialResult) {}

    @Override
    public void onCaptureCompleted(
        final CameraCaptureSession session,
        final CaptureRequest request,
        final TotalCaptureResult result) {

        afState = result.get(CaptureResult.CONTROL_AF_STATE);

        LOGGER.i("FOKKUS-MODE:"+result.get(CaptureResult.CONTROL_AF_MODE));
        LOGGER.i("FOKKUS:"+result.get(CaptureResult.CONTROL_AF_STATE));

    }

  };

Upvotes: 1

Views: 2703

Answers (1)

Eddy Talvala
Eddy Talvala

Reputation: 18107

Does your device list support for AF_MODE_MACRO in https://developer.android.com/reference/android/hardware/camera2/CameraCharacteristics.html#CONTROL_AF_AVAILABLE_MODES ?

If not, then this is expected as you're trying to use a non-supported focusing mode.

If it is supported, the next issue is that I don't see you issuing an AF trigger command anywhere. Have you looked at the state transition tables for AF_STATE here: https://developer.android.com/reference/android/hardware/camera2/CaptureResult.html#CONTROL_AF_STATE ?

For AF_AUTO and AF_MACRO, you have to trigger AF when you want a focus pass, and then wait for AF_STATE_FOCUSED_LOCKED or NOT_FOCUSED_LOCKED.

The continuous modes don't require a trigger to focus, which is why you're seeing something happening with them.

Upvotes: 1

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