Example usage for android.hardware.camera2 CaptureRequest CONTROL_AF

Introduction

In this page you can find the example usage for android.hardware.camera2 CaptureRequest CONTROL_AF_TRIGGER.

Prototype

Key CONTROL_AF_TRIGGER

To view the source code for android.hardware.camera2 CaptureRequest CONTROL_AF_TRIGGER.

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Document

Whether the camera device will trigger autofocus for this request.

This entry is normally set to IDLE, or is not included at all in the request settings.

When included and set to START, the camera device will trigger the autofocus algorithm.

Usage

From source file:com.ape.camera2raw.Camera2RawFragment.java

/**
 * Initiate a still image capture./* w  w w  .  ja  va  2  s  . c  o  m*/
 * <p/>
 * This function sends a capture request that initiates a pre-capture sequence in our state
 * machine that waits for auto-focus to finish, ending in a "locked" state where the lens is no
 * longer moving, waits for auto-exposure to choose a good exposure value, and waits for
 * auto-white-balance to converge.
 */
private void takePicture() {
    synchronized (mCameraStateLock) {
        mPendingUserCaptures++;

        // If we already triggered a pre-capture sequence, or are in a state where we cannot
        // do this, return immediately.
        if (mState != STATE_PREVIEW) {
            return;
        }

        try {
            // Trigger an auto-focus run if camera is capable. If the camera is already focused,
            // this should do nothing.
            if (!mNoAFRun) {
                mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                        CameraMetadata.CONTROL_AF_TRIGGER_START);
            }

            // If this is not a legacy device, we can also trigger an auto-exposure metering
            // run.
            if (!isLegacyLocked()) {
                // Tell the camera to lock focus.
                mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER,
                        CameraMetadata.CONTROL_AE_PRECAPTURE_TRIGGER_START);
            }

            // Update state machine to wait for auto-focus, auto-exposure, and
            // auto-white-balance (aka. "3A") to converge.
            mState = STATE_WAITING_FOR_3A_CONVERGENCE;

            // Start a timer for the pre-capture sequence.
            startTimerLocked();

            // Replace the existing repeating request with one with updated 3A triggers.
            mCaptureSession.capture(mPreviewRequestBuilder.build(), mPreCaptureCallback, mBackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
}

From source file:com.ape.camera2raw.Camera2RawFragment.java

/**
 * Called after a RAW/JPEG capture has completed; resets the AF trigger state for the
 * pre-capture sequence./*w w w .  ja v  a2 s.  co  m*/
 * <p/>
 * Call this only with {@link #mCameraStateLock} held.
 */
private void finishedCaptureLocked() {
    try {
        // Reset the auto-focus trigger in case AF didn't run quickly enough.
        if (!mNoAFRun) {
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                    CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);

            mCaptureSession.capture(mPreviewRequestBuilder.build(), mPreCaptureCallback, mBackgroundHandler);

            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                    CameraMetadata.CONTROL_AF_TRIGGER_IDLE);
        }
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}

Example usage for android.hardware.camera2 CaptureRequest CONTROL_AF_TRIGGER

Introduction

Prototype

Document

Usage