/*
 * Copyright (C) 2014 The Android Open Source Project Licensed under the Apache
 * License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law
 * or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

package android.hardware.camera2.cts;

import static android.hardware.camera2.cts.CameraTestUtils.*;
import static com.android.ex.camera2.blocking.BlockingSessionCallback.*;

import android.cts.util.MediaUtils;
import android.graphics.ImageFormat;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CaptureRequest;
import android.hardware.camera2.CaptureResult;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.util.Size;
import android.hardware.camera2.cts.testcases.Camera2SurfaceViewTestCase;
import android.media.CamcorderProfile;
import android.media.MediaCodecInfo;
import android.media.MediaCodecInfo.CodecCapabilities;
import android.media.MediaCodecInfo.CodecProfileLevel;
import android.media.Image;
import android.media.ImageReader;
import android.media.MediaCodecList;
import android.media.MediaFormat;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Environment;
import android.os.SystemClock;
import android.test.suitebuilder.annotation.LargeTest;
import android.util.Log;
import android.util.Range;
import android.view.Surface;

import com.android.ex.camera2.blocking.BlockingSessionCallback;

import junit.framework.AssertionFailedError;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

/**
 * CameraDevice video recording use case tests by using MediaRecorder and
 * MediaCodec.
 */
@LargeTest
public class RecordingTest extends Camera2SurfaceViewTestCase {
    private static final String TAG = "RecordingTest";
    private static final boolean VERBOSE = Log.isLoggable(TAG, Log.VERBOSE);
    private static final boolean DEBUG_DUMP = Log.isLoggable(TAG, Log.DEBUG);
    private static final int RECORDING_DURATION_MS = 3000;
    private static final int DURATION_MARGIN_MS = 600;
    private static final int FRAME_DURATION_ERROR_TOLERANCE_MS = 3;
    private static final int BIT_RATE_1080P = 16000000;
    private static final int BIT_RATE_MIN = 64000;
    private static final int BIT_RATE_MAX = 40000000;
    private static final int VIDEO_FRAME_RATE = 30;
    private final String VIDEO_FILE_PATH = Environment.getExternalStorageDirectory().getPath();
    private static final int[] mCamcorderProfileList = {
            CamcorderProfile.QUALITY_2160P,
            CamcorderProfile.QUALITY_1080P,
            CamcorderProfile.QUALITY_480P,
            CamcorderProfile.QUALITY_720P,
            CamcorderProfile.QUALITY_CIF,
            CamcorderProfile.QUALITY_LOW,
            CamcorderProfile.QUALITY_HIGH,
            CamcorderProfile.QUALITY_QCIF,
            CamcorderProfile.QUALITY_QVGA,
    };
    private static final int MAX_VIDEO_SNAPSHOT_IMAGES = 5;
    private static final int BURST_VIDEO_SNAPSHOT_NUM = 3;
    private static final int SLOWMO_SLOW_FACTOR = 4;
    private static final int MAX_NUM_FRAME_DROP_ALLOWED = 4;
    private List<Size> mSupportedVideoSizes;
    private Surface mRecordingSurface;
    private MediaRecorder mMediaRecorder;
    private String mOutMediaFileName;
    private int mVideoFrameRate;
    private Size mVideoSize;

    @Override
    protected void setUp() throws Exception {
        super.setUp();
    }

    @Override
    protected void tearDown() throws Exception {
        super.tearDown();
    }

    /**
     * <p>
     * Test basic camera recording.
     * </p>
     * <p>
     * This test covers the typical basic use case of camera recording.
     * MediaRecorder is used to record the audio and video, CamcorderProfile is
     * used to configure the MediaRecorder. It goes through the pre-defined
     * CamcorderProfile list, test each profile configuration and validate the
     * recorded video. Preview is set to the video size.
     * </p>
     */
    public void testBasicRecording() throws Exception {
        for (int i = 0; i < mCameraIds.length; i++) {
            try {
                Log.i(TAG, "Testing basic recording for camera " + mCameraIds[i]);
                // Re-use the MediaRecorder object for the same camera device.
                mMediaRecorder = new MediaRecorder();
                openDevice(mCameraIds[i]);

                initSupportedVideoSize(mCameraIds[i]);

                basicRecordingTestByCamera();
            } finally {
                closeDevice();
                releaseRecorder();
            }
        }
    }

    /**
     * <p>
     * Test camera recording for all supported sizes by using MediaRecorder.
     * </p>
     * <p>
     * This test covers camera recording for all supported sizes by camera. MediaRecorder
     * is used to encode the video. Preview is set to the video size. Recorded videos are
     * validated according to the recording configuration.
     * </p>
     */
    public void testSupportedVideoSizes() throws Exception {
        for (int i = 0; i < mCameraIds.length; i++) {
            try {
                Log.i(TAG, "Testing supported video size recording for camera " + mCameraIds[i]);
                // Re-use the MediaRecorder object for the same camera device.
                mMediaRecorder = new MediaRecorder();
                openDevice(mCameraIds[i]);

                initSupportedVideoSize(mCameraIds[i]);

                recordingSizeTestByCamera();
            } finally {
                closeDevice();
                releaseRecorder();
            }
        }
    }

    /**
     * Test different start/stop orders of Camera and Recorder.
     *
     * <p>The recording should be working fine for any kind of start/stop orders.</p>
     */
    public void testCameraRecorderOrdering() {
        // TODO: need implement
    }

    /**
     * <p>
     * Test camera recording for all supported sizes by using MediaCodec.
     * </p>
     * <p>
     * This test covers video only recording for all supported sizes (camera and
     * encoder). MediaCodec is used to encode the video. The recorded videos are
     * validated according to the recording configuration.
     * </p>
     */
    public void testMediaCodecRecording() throws Exception {
        // TODO. Need implement.
    }

    /**
     * <p>
     * Test video snapshot for each camera.
     * </p>
     * <p>
     * This test covers video snapshot typical use case. The MediaRecorder is used to record the
     * video for each available video size. The largest still capture size is selected to
     * capture the JPEG image. The still capture images are validated according to the capture
     * configuration. The timestamp of capture result before and after video snapshot is also
     * checked to make sure no frame drop caused by video snapshot.
     * </p>
     */
    public void testVideoSnapshot() throws Exception {
        videoSnapshotHelper(/*burstTest*/false);
    }

    /**
     * <p>
     * Test burst video snapshot for each camera.
     * </p>
     * <p>
     * This test covers burst video snapshot capture. The MediaRecorder is used to record the
     * video for each available video size. The largest still capture size is selected to
     * capture the JPEG image. {@value #BURST_VIDEO_SNAPSHOT_NUM} video snapshot requests will be
     * sent during the test. The still capture images are validated according to the capture
     * configuration.
     * </p>
     */
    public void testBurstVideoSnapshot() throws Exception {
        videoSnapshotHelper(/*burstTest*/true);
    }

    /**
     * Test timelapse recording, where capture rate is slower than video (playback) frame rate.
     */
    public void testTimelapseRecording() throws Exception {
        // TODO. Need implement.
    }

    public void testSlowMotionRecording() throws Exception {
        slowMotionRecording();
    }

    /**
     * Test slow motion recording where capture rate (camera output) is different with
     * video (playback) frame rate for each camera if high speed recording is supported
     * by both camera and encoder.
     *
     * <p>
     * Normal recording use cases make the capture rate (camera output frame
     * rate) the same as the video (playback) frame rate. This guarantees that
     * the motions in the scene play at the normal speed. If the capture rate is
     * faster than video frame rate, for a given time duration, more number of
     * frames are captured than it can be played in the same time duration. This
     * generates "slow motion" effect during playback.
     * </p>
     */
    private void slowMotionRecording() throws Exception {
        for (String id : mCameraIds) {
            try {
                Log.i(TAG, "Testing slow motion recording for camera " + id);
                // Re-use the MediaRecorder object for the same camera device.
                mMediaRecorder = new MediaRecorder();
                openDevice(id);

                if (!mStaticInfo.isHighSpeedVideoSupported()) {
                    continue;
                }

                StreamConfigurationMap config =
                        mStaticInfo.getValueFromKeyNonNull(
                                CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
                Size[] highSpeedVideoSizes = config.getHighSpeedVideoSizes();
                for (Size size : highSpeedVideoSizes) {
                    Range<Integer> fpsRange = getHighestHighSpeedFixedFpsRangeForSize(config, size);
                    mCollector.expectNotNull("Unable to find the fixed frame rate fps range for " +
                            "size " + size, fpsRange);
                    if (fpsRange == null) {
                        continue;
                    }

                    int captureRate = fpsRange.getLower();
                    int videoFramerate = captureRate / SLOWMO_SLOW_FACTOR;
                    /**
                     * Check if encoder support this. TODO: use HIGH_SPEED_720p
                     * CamCorderProfile to get the performance guarantee. Also
                     * add the test in StaticMetadataTest to check: 1. Camera
                     * high speed recording metadata is correctly reported 2.
                     * Encoder profile/level info is correctly reported. After
                     * that, we only need check the CamcorderProfile before
                     * skipping the test.
                     */
                    if (!isSupportedByAVCEncoder(size, captureRate)) {
                        Log.i(TAG, "high speed recording " + size + "@" + captureRate + "fps"
                                + " is not supported by AVC encoder");
                        continue;
                    }

                    mOutMediaFileName = VIDEO_FILE_PATH + "/test_slowMo_video.mp4";
                    if (DEBUG_DUMP) {
                        mOutMediaFileName = VIDEO_FILE_PATH + "/test_slowMo_video_" + id + "_"
                                + size.toString() + ".mp4";
                    }

                    prepareRecording(size, videoFramerate, captureRate);

                    // prepare preview surface by using video size.
                    updatePreviewSurfaceWithVideoSize(size);

                    // Start recording
                    startSlowMotionRecording(/*useMediaRecorder*/true, videoFramerate, captureRate,
                            fpsRange);
                    long startTime = SystemClock.elapsedRealtime();

                    // Record certain duration.
                    SystemClock.sleep(RECORDING_DURATION_MS);

                    // Stop recording and preview
                    stopRecording(/*useMediaRecorder*/true);
                    int duration = (int) (SystemClock.elapsedRealtime() - startTime);

                    // Validation.
                    validateRecording(size, duration * SLOWMO_SLOW_FACTOR);

                }

            } finally {
                closeDevice();
                releaseRecorder();
            }
        }
    }

    private Range<Integer> getHighestHighSpeedFixedFpsRangeForSize(StreamConfigurationMap config,
            Size size) {
        Range<Integer>[] availableFpsRanges = config.getHighSpeedVideoFpsRangesFor(size);
        Range<Integer> maxRange = availableFpsRanges[0];
        boolean foundRange = false;
        for (Range<Integer> range : availableFpsRanges) {
            if (range.getLower() == range.getUpper() && range.getLower() >= maxRange.getLower()) {
                foundRange = true;
                maxRange = range;
            }
        }

        if (!foundRange) {
            return null;
        }
        return maxRange;
    }

    private void startSlowMotionRecording(boolean useMediaRecorder, int videoFrameRate,
            int captureRate, Range<Integer> fpsRange) throws Exception {
        List<Surface> outputSurfaces = new ArrayList<Surface>(2);
        assertTrue("Both preview and recording surfaces should be valid",
                mPreviewSurface.isValid() && mRecordingSurface.isValid());
        outputSurfaces.add(mPreviewSurface);
        outputSurfaces.add(mRecordingSurface);
        // Video snapshot surface
        if (mReaderSurface != null) {
            outputSurfaces.add(mReaderSurface);
        }
        mSessionListener = new BlockingSessionCallback();
        mSession = configureCameraSession(mCamera, outputSurfaces, mSessionListener, mHandler);

        CaptureRequest.Builder recordingRequestBuilder =
                mCamera.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);
        recordingRequestBuilder.set(CaptureRequest.CONTROL_MODE,
                CaptureRequest.CONTROL_MODE_USE_SCENE_MODE);
        recordingRequestBuilder.set(CaptureRequest.CONTROL_SCENE_MODE,
                CaptureRequest.CONTROL_SCENE_MODE_HIGH_SPEED_VIDEO);

        CaptureRequest.Builder recordingOnlyBuilder =
                mCamera.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);
        recordingOnlyBuilder.set(CaptureRequest.CONTROL_MODE,
                CaptureRequest.CONTROL_MODE_USE_SCENE_MODE);
        recordingOnlyBuilder.set(CaptureRequest.CONTROL_SCENE_MODE,
                CaptureRequest.CONTROL_SCENE_MODE_HIGH_SPEED_VIDEO);
        int slowMotionFactor = captureRate / videoFrameRate;

        // Make sure camera output frame rate is set to correct value.
        recordingRequestBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, fpsRange);
        recordingRequestBuilder.addTarget(mRecordingSurface);
        recordingRequestBuilder.addTarget(mPreviewSurface);
        recordingOnlyBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, fpsRange);
        recordingOnlyBuilder.addTarget(mRecordingSurface);

        List<CaptureRequest> slowMoRequests = new ArrayList<CaptureRequest>();
        slowMoRequests.add(recordingRequestBuilder.build());// Preview + recording.

        for (int i = 0; i < slowMotionFactor - 1; i++) {
            slowMoRequests.add(recordingOnlyBuilder.build()); // Recording only.
        }
        mSession.setRepeatingBurst(slowMoRequests, null, null);

        if (useMediaRecorder) {
            mMediaRecorder.start();
        } else {
            // TODO: need implement MediaCodec path.
        }

    }

    /**
     * Test camera recording by using each available CamcorderProfile for a
     * given camera. preview size is set to the video size.
     */
    private void basicRecordingTestByCamera() throws Exception {
        Size maxPreviewSize = mOrderedPreviewSizes.get(0);
        for (int profileId : mCamcorderProfileList) {
            int cameraId = Integer.valueOf(mCamera.getId());
            if (!CamcorderProfile.hasProfile(cameraId, profileId) ||
                    allowedUnsupported(cameraId, profileId)) {
                continue;
            }

            CamcorderProfile profile = CamcorderProfile.get(cameraId, profileId);
            Size videoSz = new Size(profile.videoFrameWidth, profile.videoFrameHeight);
            if (mStaticInfo.isHardwareLevelLegacy() &&
                    (videoSz.getWidth() > maxPreviewSize.getWidth() ||
                     videoSz.getHeight() > maxPreviewSize.getHeight())) {
                // Skip. Legacy mode can only do recording up to max preview size
                continue;
            }
            assertTrue("Video size " + videoSz.toString() + " for profile ID " + profileId +
                            " must be one of the camera device supported video size!",
                            mSupportedVideoSizes.contains(videoSz));

            if (VERBOSE) {
                Log.v(TAG, "Testing camera recording with video size " + videoSz.toString());
            }

            // Configure preview and recording surfaces.
            mOutMediaFileName = VIDEO_FILE_PATH + "/test_video.mp4";
            if (DEBUG_DUMP) {
                mOutMediaFileName = VIDEO_FILE_PATH + "/test_video_" + cameraId + "_"
                        + videoSz.toString() + ".mp4";
            }

            prepareRecordingWithProfile(profile);

            // prepare preview surface by using video size.
            updatePreviewSurfaceWithVideoSize(videoSz);

            // Start recording
            startRecording(/* useMediaRecorder */true);
            long startTime = SystemClock.elapsedRealtime();

            // Record certain duration.
            SystemClock.sleep(RECORDING_DURATION_MS);

            // Stop recording and preview
            stopRecording(/* useMediaRecorder */true);
            int duration = (int) (SystemClock.elapsedRealtime() - startTime);

            // Validation.
            validateRecording(videoSz, duration);
        }
    }

    /**
     * Test camera recording for each supported video size by camera, preview
     * size is set to the video size.
     */
    private void recordingSizeTestByCamera() throws Exception {
        for (Size sz : mSupportedVideoSizes) {
            if (!isSupported(sz, VIDEO_FRAME_RATE, VIDEO_FRAME_RATE)) {
                continue;
            }

            if (VERBOSE) {
                Log.v(TAG, "Testing camera recording with video size " + sz.toString());
            }

            // Configure preview and recording surfaces.
            mOutMediaFileName = VIDEO_FILE_PATH + "/test_video.mp4";
            if (DEBUG_DUMP) {
                mOutMediaFileName = VIDEO_FILE_PATH + "/test_video_" + mCamera.getId() + "_"
                        + sz.toString() + ".mp4";
            }

            // Use AVC and AAC a/v compression format.
            prepareRecording(sz, VIDEO_FRAME_RATE, VIDEO_FRAME_RATE);

            // prepare preview surface by using video size.
            updatePreviewSurfaceWithVideoSize(sz);

            // Start recording
            startRecording(/* useMediaRecorder */true);
            long startTime = SystemClock.elapsedRealtime();

            // Record certain duration.
            SystemClock.sleep(RECORDING_DURATION_MS);

            // Stop recording and preview
            stopRecording(/* useMediaRecorder */true);
            int duration = (int) (SystemClock.elapsedRealtime() - startTime);

            // Validation.
            validateRecording(sz, duration);
        }
    }

    /**
     * Initialize the supported video sizes.
     */
    private void initSupportedVideoSize(String cameraId)  throws Exception {
        Size maxVideoSize = SIZE_BOUND_1080P;
        if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_2160P)) {
            maxVideoSize = SIZE_BOUND_2160P;
        }
        mSupportedVideoSizes =
                getSupportedVideoSizes(cameraId, mCameraManager, maxVideoSize);
    }

    /**
     * Simple wrapper to wrap normal/burst video snapshot tests
     */
    private void videoSnapshotHelper(boolean burstTest) throws Exception {
            for (String id : mCameraIds) {
                try {
                    Log.i(TAG, "Testing video snapshot for camera " + id);
                    // Re-use the MediaRecorder object for the same camera device.
                    mMediaRecorder = new MediaRecorder();

                    openDevice(id);

                    if (mStaticInfo.isHardwareLevelLegacy()) {
                        Log.i(TAG, "Skipping test on legacy devices");
                        continue;
                    }

                    initSupportedVideoSize(id);

                    videoSnapshotTestByCamera(burstTest);
                } finally {
                    closeDevice();
                    releaseRecorder();
                }
            }
    }

    /**
     * Returns {@code true} if the {@link CamcorderProfile} ID is allowed to be unsupported.
     *
     * <p>This only allows unsupported profiles when using the LEGACY mode of the Camera API.</p>
     *
     * @param profileId a {@link CamcorderProfile} ID to check.
     * @return {@code true} if supported.
     */
    private boolean allowedUnsupported(int cameraId, int profileId) {
        if (!mStaticInfo.isHardwareLevelLegacy()) {
            return false;
        }

        switch(profileId) {
            case CamcorderProfile.QUALITY_2160P:
            case CamcorderProfile.QUALITY_1080P:
            case CamcorderProfile.QUALITY_HIGH:
                return !CamcorderProfile.hasProfile(cameraId, profileId) ||
                        CamcorderProfile.get(cameraId, profileId).videoFrameWidth >= 1080;
        }
        return false;
    }

    /**
     * Test video snapshot for each  available CamcorderProfile for a given camera.
     *
     * <p>
     * Preview size is set to the video size. For the burst test, frame drop and jittering
     * is not checked.
     * </p>
     *
     * @param burstTest Perform burst capture or single capture. For burst capture
     *                  {@value #BURST_VIDEO_SNAPSHOT_NUM} capture requests will be sent.
     */
    private void videoSnapshotTestByCamera(boolean burstTest)
            throws Exception {
        final int NUM_SINGLE_SHOT_TEST = 5;
        final int FRAMEDROP_TOLERANCE = 8;
        for (int profileId : mCamcorderProfileList) {
            int cameraId = Integer.valueOf(mCamera.getId());
            if (!CamcorderProfile.hasProfile(cameraId, profileId) ||
                    allowedUnsupported(cameraId, profileId)) {
                continue;
            }

            CamcorderProfile profile = CamcorderProfile.get(cameraId, profileId);
            Size videoSz = new Size(profile.videoFrameWidth, profile.videoFrameHeight);
            if (!mSupportedVideoSizes.contains(videoSz)) {
                mCollector.addMessage("Video size " + videoSz.toString() + " for profile ID " +
                        profileId + " must be one of the camera device supported video size!");
                continue;
            }

            Size maxPreviewSize = mOrderedPreviewSizes.get(0);

            // For LEGACY, find closest supported smaller or equal JPEG size to the current video
            // size; if no size is smaller than the video, pick the smallest JPEG size.  The assert
            // for video size above guarantees that for LIMITED or FULL, we select videoSz here.
            Size videoSnapshotSz = mOrderedStillSizes.get(mOrderedStillSizes.size() - 1);
            for (int i = mOrderedStillSizes.size() - 2; i >= 0; i--) {
                Size candidateSize = mOrderedStillSizes.get(i);
                if (candidateSize.getWidth() <= videoSz.getWidth() &&
                        candidateSize.getHeight() <= videoSz.getHeight()) {
                    videoSnapshotSz = candidateSize;
                }
            }

            /**
             * Only test full res snapshot when below conditions are all true.
             * 1. Camera is a FULL device
             * 2. video size is up to max preview size, which will be bounded by 1080p.
             */
            if (mStaticInfo.isHardwareLevelFull() &&
                    videoSz.getWidth() <= maxPreviewSize.getWidth() &&
                    videoSz.getHeight() <= maxPreviewSize.getHeight()) {
                videoSnapshotSz = mOrderedStillSizes.get(0);
            }

            createImageReader(
                    videoSnapshotSz, ImageFormat.JPEG,
                    MAX_VIDEO_SNAPSHOT_IMAGES, /*listener*/null);

            if (VERBOSE) {
                Log.v(TAG, "Testing camera recording with video size " + videoSz.toString());
            }

            // Configure preview and recording surfaces.
            mOutMediaFileName = VIDEO_FILE_PATH + "/test_video.mp4";
            if (DEBUG_DUMP) {
                mOutMediaFileName = VIDEO_FILE_PATH + "/test_video_" + cameraId + "_"
                        + videoSz.toString() + ".mp4";
            }

            int numTestIterations = burstTest ? 1 : NUM_SINGLE_SHOT_TEST;
            int totalDroppedFrames = 0;

            for (int numTested = 0; numTested < numTestIterations; numTested++) {
                prepareRecordingWithProfile(profile);

                // prepare video snapshot
                SimpleCaptureCallback resultListener = new SimpleCaptureCallback();
                SimpleImageReaderListener imageListener = new SimpleImageReaderListener();
                CaptureRequest.Builder videoSnapshotRequestBuilder =
                        mCamera.createCaptureRequest((mStaticInfo.isHardwareLevelLegacy()) ?
                                CameraDevice.TEMPLATE_RECORD :
                                CameraDevice.TEMPLATE_VIDEO_SNAPSHOT);

                // prepare preview surface by using video size.
                updatePreviewSurfaceWithVideoSize(videoSz);

                prepareVideoSnapshot(videoSnapshotRequestBuilder, imageListener);
                CaptureRequest request = videoSnapshotRequestBuilder.build();

                // Start recording
                startRecording(/* useMediaRecorder */true, resultListener);
                long startTime = SystemClock.elapsedRealtime();

                // Record certain duration.
                SystemClock.sleep(RECORDING_DURATION_MS / 2);

                // take video snapshot
                if (burstTest) {
                    List<CaptureRequest> requests =
                            new ArrayList<CaptureRequest>(BURST_VIDEO_SNAPSHOT_NUM);
                    for (int i = 0; i < BURST_VIDEO_SNAPSHOT_NUM; i++) {
                        requests.add(request);
                    }
                    mSession.captureBurst(requests, resultListener, mHandler);
                } else {
                    mSession.capture(request, resultListener, mHandler);
                }

                // make sure recording is still going after video snapshot
                SystemClock.sleep(RECORDING_DURATION_MS / 2);

                // Stop recording and preview
                stopRecording(/* useMediaRecorder */true);
                int duration = (int) (SystemClock.elapsedRealtime() - startTime);

                // Validation recorded video
                validateRecording(videoSz, duration);

                if (burstTest) {
                    for (int i = 0; i < BURST_VIDEO_SNAPSHOT_NUM; i++) {
                        Image image = imageListener.getImage(CAPTURE_IMAGE_TIMEOUT_MS);
                        validateVideoSnapshotCapture(image, videoSnapshotSz);
                        image.close();
                    }
                } else {
                    // validate video snapshot image
                    Image image = imageListener.getImage(CAPTURE_IMAGE_TIMEOUT_MS);
                    validateVideoSnapshotCapture(image, videoSnapshotSz);

                    // validate if there is framedrop around video snapshot
                    totalDroppedFrames +=  validateFrameDropAroundVideoSnapshot(
                            resultListener, image.getTimestamp());

                    //TODO: validate jittering. Should move to PTS
                    //validateJittering(resultListener);

                    image.close();
                }
            }

            if (!burstTest) {
                Log.w(TAG, String.format("Camera %d Video size %s: Number of dropped frames " +
                        "detected in %d trials is %d frames.", cameraId, videoSz.toString(),
                        numTestIterations, totalDroppedFrames));
                mCollector.expectLessOrEqual(
                        String.format(
                                "Camera %d Video size %s: Number of dropped frames %d must not"
                                + " be larger than %d",
                                cameraId, videoSz.toString(), totalDroppedFrames,
                                FRAMEDROP_TOLERANCE),
                        FRAMEDROP_TOLERANCE, totalDroppedFrames);
            }
            closeImageReader();
        }
    }

    /**
     * Configure video snapshot request according to the still capture size
     */
    private void prepareVideoSnapshot(
            CaptureRequest.Builder requestBuilder,
            ImageReader.OnImageAvailableListener imageListener)
            throws Exception {
        mReader.setOnImageAvailableListener(imageListener, mHandler);
        assertNotNull("Recording surface must be non-null!", mRecordingSurface);
        requestBuilder.addTarget(mRecordingSurface);
        assertNotNull("Preview surface must be non-null!", mPreviewSurface);
        requestBuilder.addTarget(mPreviewSurface);
        assertNotNull("Reader surface must be non-null!", mReaderSurface);
        requestBuilder.addTarget(mReaderSurface);
    }

    /**
     * Update preview size with video size.
     *
     * <p>Preview size will be capped with max preview size.</p>
     *
     * @param videoSize The video size used for preview.
     */
    private void updatePreviewSurfaceWithVideoSize(Size videoSize) {
        if (mOrderedPreviewSizes == null) {
            throw new IllegalStateException("supported preview size list is not initialized yet");
        }
        Size maxPreviewSize = mOrderedPreviewSizes.get(0);
        Size previewSize = videoSize;
        if (videoSize.getWidth() > maxPreviewSize.getWidth() ||
                videoSize.getHeight() > maxPreviewSize.getHeight()) {
            Log.w(TAG, "Overwrite preview size from " + videoSize.toString() +
                    " to " + maxPreviewSize.toString());
            previewSize = maxPreviewSize;
        }

        updatePreviewSurface(previewSize);
    }

    /**
     * Configure MediaRecorder recording session with CamcorderProfile, prepare
     * the recording surface.
     */
    private void prepareRecordingWithProfile(CamcorderProfile profile)
            throws Exception {
        // Prepare MediaRecorder.
        mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
        mMediaRecorder.setProfile(profile);
        mMediaRecorder.setOutputFile(mOutMediaFileName);
        mMediaRecorder.prepare();
        mRecordingSurface = mMediaRecorder.getSurface();
        assertNotNull("Recording surface must be non-null!", mRecordingSurface);
        mVideoFrameRate = profile.videoFrameRate;
        mVideoSize = new Size(profile.videoFrameWidth, profile.videoFrameHeight);
    }

    /**
     * Configure MediaRecorder recording session with CamcorderProfile, prepare
     * the recording surface. Use AVC for video compression, AAC for audio compression.
     * Both are required for android devices by android CDD.
     */
    private void prepareRecording(Size sz, int videoFrameRate, int captureRate)
            throws Exception {
        // Prepare MediaRecorder.
        mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
        mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mMediaRecorder.setOutputFile(mOutMediaFileName);
        mMediaRecorder.setVideoEncodingBitRate(getVideoBitRate(sz));
        mMediaRecorder.setVideoFrameRate(videoFrameRate);
        mMediaRecorder.setCaptureRate(captureRate);
        mMediaRecorder.setVideoSize(sz.getWidth(), sz.getHeight());
        mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
        mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
        mMediaRecorder.prepare();
        mRecordingSurface = mMediaRecorder.getSurface();
        assertNotNull("Recording surface must be non-null!", mRecordingSurface);
        mVideoFrameRate = videoFrameRate;
        mVideoSize = sz;
    }

    private void startRecording(boolean useMediaRecorder,
            CameraCaptureSession.CaptureCallback listener) throws Exception {
        List<Surface> outputSurfaces = new ArrayList<Surface>(2);
        assertTrue("Both preview and recording surfaces should be valid",
                mPreviewSurface.isValid() && mRecordingSurface.isValid());
        outputSurfaces.add(mPreviewSurface);
        outputSurfaces.add(mRecordingSurface);
        // Video snapshot surface
        if (mReaderSurface != null) {
            outputSurfaces.add(mReaderSurface);
        }
        mSessionListener = new BlockingSessionCallback();
        mSession = configureCameraSession(mCamera, outputSurfaces, mSessionListener, mHandler);

        CaptureRequest.Builder recordingRequestBuilder =
                mCamera.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);
        // Make sure camera output frame rate is set to correct value.
        Range<Integer> fpsRange = Range.create(mVideoFrameRate, mVideoFrameRate);
        recordingRequestBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, fpsRange);
        recordingRequestBuilder.addTarget(mRecordingSurface);
        recordingRequestBuilder.addTarget(mPreviewSurface);
        mSession.setRepeatingRequest(recordingRequestBuilder.build(), listener, mHandler);

        if (useMediaRecorder) {
            mMediaRecorder.start();
        } else {
            // TODO: need implement MediaCodec path.
        }
    }

    private void startRecording(boolean useMediaRecorder)  throws Exception {
        startRecording(useMediaRecorder, null);
    }

    private void stopCameraStreaming() throws Exception {
        if (VERBOSE) {
            Log.v(TAG, "Stopping camera streaming and waiting for idle");
        }
        // Stop repeating, wait for captures to complete, and disconnect from
        // surfaces
        mSession.close();
        mSessionListener.getStateWaiter().waitForState(SESSION_CLOSED, SESSION_CLOSE_TIMEOUT_MS);
    }

    private void stopRecording(boolean useMediaRecorder) throws Exception {
        if (useMediaRecorder) {
            stopCameraStreaming();

            mMediaRecorder.stop();
            // Can reuse the MediaRecorder object after reset.
            mMediaRecorder.reset();
        } else {
            // TODO: need implement MediaCodec path.
        }
        if (mRecordingSurface != null) {
            mRecordingSurface.release();
            mRecordingSurface = null;
        }
    }

    private void releaseRecorder() {
        if (mMediaRecorder != null) {
            mMediaRecorder.release();
            mMediaRecorder = null;
        }
    }

    private void validateRecording(Size sz, int durationMs) throws Exception {
        File outFile = new File(mOutMediaFileName);
        assertTrue("No video is recorded", outFile.exists());

        MediaPlayer mediaPlayer = new MediaPlayer();
        try {
            mediaPlayer.setDataSource(mOutMediaFileName);
            mediaPlayer.prepare();
            Size videoSz = new Size(mediaPlayer.getVideoWidth(), mediaPlayer.getVideoHeight());
            assertTrue("Video size doesn't match, expected " + sz.toString() +
                    " got " + videoSz.toString(), videoSz.equals(sz));
            int duration = mediaPlayer.getDuration();
            if (VERBOSE) {
                Log.v(TAG, String.format("Video duration: recorded %dms, expected %dms",
                                         duration, durationMs));
            }

            // TODO: Don't skip this for video snapshot
            if (!mStaticInfo.isHardwareLevelLegacy()) {
                assertTrue(String.format(
                        "Video duration doesn't match: recorded %dms, expected %dms", duration,
                        durationMs), Math.abs(duration - durationMs) < DURATION_MARGIN_MS);
            }
        } finally {
            mediaPlayer.release();
            if (!DEBUG_DUMP) {
                outFile.delete();
            }
        }
    }

    /**
     * Validate video snapshot capture image object sanity and test.
     *
     * <p> Check for size, format and jpeg decoding</p>
     *
     * @param image The JPEG image to be verified.
     * @param size The JPEG capture size to be verified against.
     */
    private void validateVideoSnapshotCapture(Image image, Size size) {
        CameraTestUtils.validateImage(image, size.getWidth(), size.getHeight(),
                ImageFormat.JPEG, /*filePath*/null);
    }

    /**
     * Validate if video snapshot causes frame drop.
     * Here frame drop is defined as frame duration >= 2 * expected frame duration.
     * Return the estimated number of frames dropped during video snapshot
     */
    private int validateFrameDropAroundVideoSnapshot(
            SimpleCaptureCallback resultListener, long imageTimeStamp) {
        int expectedDurationMs = 1000 / mVideoFrameRate;
        CaptureResult prevResult = resultListener.getCaptureResult(WAIT_FOR_RESULT_TIMEOUT_MS);
        long prevTS = getValueNotNull(prevResult, CaptureResult.SENSOR_TIMESTAMP);
        while (!resultListener.hasMoreResults()) {
            CaptureResult currentResult =
                    resultListener.getCaptureResult(WAIT_FOR_RESULT_TIMEOUT_MS);
            long currentTS = getValueNotNull(currentResult, CaptureResult.SENSOR_TIMESTAMP);
            if (currentTS == imageTimeStamp) {
                // validate the timestamp before and after, then return
                CaptureResult nextResult =
                        resultListener.getCaptureResult(WAIT_FOR_RESULT_TIMEOUT_MS);
                long nextTS = getValueNotNull(nextResult, CaptureResult.SENSOR_TIMESTAMP);
                int durationMs = (int) (currentTS - prevTS) / 1000000;
                int totalFramesDropped = 0;

                // Snapshots in legacy mode pause the preview briefly.  Skip the duration
                // requirements for legacy mode unless this is fixed.
                if (!mStaticInfo.isHardwareLevelLegacy()) {
                    mCollector.expectTrue(
                            String.format(
                                    "Video %dx%d Frame drop detected before video snapshot: " +
                                            "duration %dms (expected %dms)",
                                    mVideoSize.getWidth(), mVideoSize.getHeight(),
                                    durationMs, expectedDurationMs
                            ),
                            durationMs <= (expectedDurationMs * MAX_NUM_FRAME_DROP_ALLOWED)
                    );
                    // Log a warning is there is any frame drop detected.
                    if (durationMs >= expectedDurationMs * 2) {
                        Log.w(TAG, String.format(
                                "Video %dx%d Frame drop detected before video snapshot: " +
                                        "duration %dms (expected %dms)",
                                mVideoSize.getWidth(), mVideoSize.getHeight(),
                                durationMs, expectedDurationMs
                        ));
                    }

                    durationMs = (int) (nextTS - currentTS) / 1000000;
                    mCollector.expectTrue(
                            String.format(
                                    "Video %dx%d Frame drop detected after video snapshot: " +
                                            "duration %dms (expected %dms)",
                                    mVideoSize.getWidth(), mVideoSize.getHeight(),
                                    durationMs, expectedDurationMs
                            ),
                            durationMs <= (expectedDurationMs * MAX_NUM_FRAME_DROP_ALLOWED)
                    );
                    // Log a warning is there is any frame drop detected.
                    if (durationMs >= expectedDurationMs * 2) {
                        Log.w(TAG, String.format(
                                "Video %dx%d Frame drop detected after video snapshot: " +
                                        "duration %dms (expected %dms)",
                                mVideoSize.getWidth(), mVideoSize.getHeight(),
                                durationMs, expectedDurationMs
                        ));
                    }

                    int totalDurationMs = (int) (nextTS - prevTS) / 1000000;
                    // Rounding and minus 2 for the expected 2 frames interval
                    totalFramesDropped =
                            (totalDurationMs + expectedDurationMs / 2) /expectedDurationMs - 2;
                    if (totalFramesDropped < 0) {
                        Log.w(TAG, "totalFrameDropped is " + totalFramesDropped +
                                ". Video frame rate might be too fast.");
                    }
                    totalFramesDropped = Math.max(0, totalFramesDropped);
                }
                return totalFramesDropped;
            }
            prevTS = currentTS;
        }
        throw new AssertionFailedError(
                "Video snapshot timestamp does not match any of capture results!");
    }

    /**
     * Validate frame jittering from the input simple listener's buffered results
     */
    private void validateJittering(SimpleCaptureCallback resultListener) {
        int expectedDurationMs = 1000 / mVideoFrameRate;
        CaptureResult prevResult = resultListener.getCaptureResult(WAIT_FOR_RESULT_TIMEOUT_MS);
        long prevTS = getValueNotNull(prevResult, CaptureResult.SENSOR_TIMESTAMP);
        while (!resultListener.hasMoreResults()) {
            CaptureResult currentResult =
                    resultListener.getCaptureResult(WAIT_FOR_RESULT_TIMEOUT_MS);
            long currentTS = getValueNotNull(currentResult, CaptureResult.SENSOR_TIMESTAMP);
            int durationMs = (int) (currentTS - prevTS) / 1000000;
            int durationError = Math.abs(durationMs - expectedDurationMs);
            long frameNumber = currentResult.getFrameNumber();
            mCollector.expectTrue(
                    String.format(
                            "Resolution %dx%d Frame %d: jittering (%dms) exceeds bound [%dms,%dms]",
                            mVideoSize.getWidth(), mVideoSize.getHeight(),
                            frameNumber, durationMs,
                            expectedDurationMs - FRAME_DURATION_ERROR_TOLERANCE_MS,
                            expectedDurationMs + FRAME_DURATION_ERROR_TOLERANCE_MS),
                    durationError <= FRAME_DURATION_ERROR_TOLERANCE_MS);
            prevTS = currentTS;
        }
    }

    /**
     * Calculate a video bit rate based on the size. The bit rate is scaled
     * based on ratio of video size to 1080p size.
     */
    private int getVideoBitRate(Size sz) {
        int rate = BIT_RATE_1080P;
        float scaleFactor = sz.getHeight() * sz.getWidth() / (float)(1920 * 1080);
        rate = (int)(rate * scaleFactor);

        // Clamp to the MIN, MAX range.
        return Math.max(BIT_RATE_MIN, Math.min(BIT_RATE_MAX, rate));
    }

    /**
     * Check if the encoder and camera are able to support this size and frame rate.
     * Assume the video compression format is AVC.
     */
    private boolean isSupported(Size sz, int captureRate, int encodingRate) throws Exception {
        // Check camera capability.
        if (!isSupportedByCamera(sz, captureRate)) {
            return false;
        }

        // Check encode capability.
        if (!isSupportedByAVCEncoder(sz, encodingRate)){
            return false;
        }

        if(VERBOSE) {
            Log.v(TAG, "Both encoder and camera support " + sz.toString() + "@" + encodingRate + "@"
                    + getVideoBitRate(sz) / 1000 + "Kbps");
        }

        return true;
    }

    private boolean isSupportedByCamera(Size sz, int frameRate) {
        // Check if camera can support this sz and frame rate combination.
        StreamConfigurationMap config = mStaticInfo.
                getValueFromKeyNonNull(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);

        long minDuration = config.getOutputMinFrameDuration(MediaRecorder.class, sz);
        if (minDuration == 0) {
            return false;
        }

        int maxFrameRate = (int) (1e9f / minDuration);
        return maxFrameRate >= frameRate;
    }

    /**
     * Check if encoder can support this size and frame rate combination by querying
     * MediaCodec capability. Check is based on size and frame rate. Ignore the bit rate
     * as the bit rates targeted in this test are well below the bit rate max value specified
     * by AVC specification for certain level.
     */
    private static boolean isSupportedByAVCEncoder(Size sz, int frameRate) {
        MediaFormat format = MediaFormat.createVideoFormat(
                MediaFormat.MIMETYPE_VIDEO_AVC, sz.getWidth(), sz.getHeight());
        MediaCodecList mcl = new MediaCodecList(MediaCodecList.REGULAR_CODECS);
        return MediaUtils.findEncoderForFormat(format, frameRate) != null;
    }
}