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• H264FrameProcessor.java

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com.amazonaws.kinesisvideo.parser.examples.lambda.H264FrameProcessor Maven / Gradle / Ivy

// Generated by delombok at Thu Mar 10 20:43:17 UTC 2022
/*
Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License").
You may not use this file except in compliance with the License.
A copy of the License is located at

   http://aws.amazon.com/apache2.0/

or in the "license" file accompanying this file.
This file 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 com.amazonaws.kinesisvideo.parser.examples.lambda;

import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.kinesisvideo.client.KinesisVideoClient;
import com.amazonaws.kinesisvideo.client.mediasource.CameraMediaSourceConfiguration;
import com.amazonaws.kinesisvideo.common.exception.KinesisVideoException;
import com.amazonaws.kinesisvideo.java.client.KinesisVideoJavaClientFactory;
import com.amazonaws.kinesisvideo.parser.examples.BoundingBoxImagePanel;
import com.amazonaws.kinesisvideo.parser.mkv.Frame;
import com.amazonaws.kinesisvideo.parser.mkv.FrameProcessException;
import com.amazonaws.kinesisvideo.parser.rekognition.pojo.RekognizedOutput;
import com.amazonaws.kinesisvideo.parser.utilities.FragmentMetadata;
import com.amazonaws.kinesisvideo.parser.utilities.FrameVisitor;
import com.amazonaws.kinesisvideo.parser.utilities.H264FrameDecoder;
import com.amazonaws.kinesisvideo.parser.utilities.H264FrameEncoder;
import com.amazonaws.kinesisvideo.parser.utilities.MkvTrackMetadata;
import com.amazonaws.kinesisvideo.parser.utilities.ProducerStreamUtil;
import com.amazonaws.kinesisvideo.producer.StreamInfo;
import com.amazonaws.regions.Regions;
import java.awt.image.BufferedImage;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.Optional;
import static com.google.common.base.Preconditions.checkState;

public class H264FrameProcessor implements FrameVisitor.FrameProcessor {
    @SuppressWarnings("all")
    private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(H264FrameProcessor.class);
    private static final int MILLIS_IN_SEC = 1000;
    private static final int OFFSET_DELTA_THRESHOLD = 10;
    private final BoundingBoxImagePanel boundingBoxImagePanel;
    private final Regions regionName;
    private RekognizedOutput currentRekognizedOutput = null;
    private H264FrameEncoder h264Encoder;
    private H264FrameDecoder h264Decoder;
    private KVSMediaSource KVSMediaSource;
    private boolean isKVSProducerInitialized = false;
    private boolean isEncoderInitialized = false;
    private final AWSCredentialsProvider credentialsProvider;
    private final String outputKvsStreamName;
    private List rekognizedOutputs;
    private int frameBitRate = 1024;
    private int frameNo = 0;
    private int currentWidth = 0;
    private int currentHeight = 0;
    private long keyFrameTimecode;

    private H264FrameProcessor(final AWSCredentialsProvider credentialsProvider, final String outputKvsStreamName, final Regions regionName) {
        this.boundingBoxImagePanel = new BoundingBoxImagePanel();
        this.credentialsProvider = credentialsProvider;
        this.outputKvsStreamName = outputKvsStreamName;
        this.regionName = regionName;
        this.h264Decoder = new H264FrameDecoder();
    }

    private void initializeKinesisVideoProducer(final byte[] cpd) {
        try {
            log.info("Initializing KVS Producer with stream name {} and region : {}", outputKvsStreamName, regionName);
            final KinesisVideoClient kinesisVideoClient = KinesisVideoJavaClientFactory.createKinesisVideoClient(regionName, credentialsProvider);
            final CameraMediaSourceConfiguration configuration = new CameraMediaSourceConfiguration.Builder().withFrameRate(30).withRetentionPeriodInHours(1).withCameraId("/dev/video0").withIsEncoderHardwareAccelerated(false).withEncodingMimeType("video/avc").withNalAdaptationFlags(StreamInfo.NalAdaptationFlags.NAL_ADAPTATION_ANNEXB_NALS).withIsAbsoluteTimecode(true).withEncodingBitRate(200000).withHorizontalResolution(640).withVerticalResolution(480).withCodecPrivateData(cpd).build();
            this.KVSMediaSource = new KVSMediaSource(ProducerStreamUtil.toStreamInfo(outputKvsStreamName, configuration));
            this.KVSMediaSource.configure(configuration);
            // register media source with Kinesis Video Client
            kinesisVideoClient.registerMediaSource(KVSMediaSource);
        } catch (final KinesisVideoException e) {
            log.error("Exception while initialize KVS Producer !", e);
        }
    }

    public void resetEncoder() {
        // Reset frame count for this fragment
        if (this.isEncoderInitialized) {
            this.frameNo = 0;
            this.h264Encoder.setFrameNumber(frameNo);
        } else {
            throw new IllegalStateException("Encoder not initialized !");
        }
    }

    public static H264FrameProcessor create(final AWSCredentialsProvider credentialsProvider, final String rekognizedStreamName, final Regions regionName) {
        return new H264FrameProcessor(credentialsProvider, rekognizedStreamName, regionName);
    }

    /**
     * Process Rekognized outputs for each rekognized output. For each kinesis event record i.e for each
     * fragment number create a call getMediaForFragmentList, parse fragments, decode frame, draw bounding box,
     * encode frame, call KVS PutFrame.
     */
    @Override
    public void process(final Frame frame, final MkvTrackMetadata trackMetadata, final Optional fragmentMetadata) throws FrameProcessException {
        if (rekognizedOutputs != null) {
            checkState(fragmentMetadata.isPresent(), "FragmentMetadata should be present !");
            // Decode H264 frame
            final BufferedImage decodedFrame = h264Decoder.decodeH264Frame(frame, trackMetadata);
            log.debug("Decoded frame : {} with timecode : {} and fragment metadata : {}", frameNo, frame.getTimeCode(), fragmentMetadata.get());
            // Get Rekognition results for this fragment number
            final Optional rekognizedOutput = findRekognizedOutputForFrame(frame, fragmentMetadata);
            // Render frame with bounding box
            final BufferedImage compositeFrame = renderFrame(decodedFrame, rekognizedOutput);
            // Encode to H264 frame
            final EncodedFrame encodedH264Frame = encodeH264Frame(compositeFrame);
            encodedH264Frame.setTimeCode(fragmentMetadata.get().getProducerSideTimestampMillis() + frame.getTimeCode());
            log.debug("Encoded frame : {} with timecode : {}", frameNo, encodedH264Frame.getTimeCode());
            // Call PutFrame for processed encodedFrame.
            putFrame(encodedH264Frame);
            frameNo++;
        } else {
            log.warn("Rekognition output is empty");
        }
    }

    private void putFrame(final EncodedFrame encodedH264Frame) {
        if (!isKVSProducerInitialized) {
            log.info("Initializing JNI...");
            initializeKinesisVideoProducer(encodedH264Frame.getCpd().array());
            isKVSProducerInitialized = true;
        }
        KVSMediaSource.putFrameData(encodedH264Frame);
        log.debug("PutFrame successful for frame no : {}", frameNo);
    }

    private EncodedFrame encodeH264Frame(final BufferedImage bufferedImage) {
        try {
            initializeEncoder(bufferedImage);
            return h264Encoder.encodeFrame(bufferedImage);
        } catch (final Exception e) {
            throw new RuntimeException("Unable to encode the bufferedImage !", e);
        }
    }

    private void initializeEncoder(final BufferedImage bufferedImage) {
        // Initialize the encoder if it's not initialized or if the current frame resolution changes from previous one.
        if (!isEncoderInitialized || (currentWidth != bufferedImage.getWidth() || currentHeight != bufferedImage.getHeight())) {
            this.h264Encoder = new H264FrameEncoder(bufferedImage.getWidth(), bufferedImage.getHeight(), frameBitRate);
            this.isEncoderInitialized = true;
            this.currentWidth = bufferedImage.getWidth();
            this.currentHeight = bufferedImage.getHeight();
        }
    }

    private Optional findRekognizedOutputForFrame(final Frame frame, final Optional fragmentMetadata) {
        Optional rekognizedOutput = Optional.empty();
        if (fragmentMetadata.isPresent()) {
            final String fragmentNumber = fragmentMetadata.get().getFragmentNumberString();
            // Currently Rekognition samples frames and calculates the frame offset from the fragment start time.
            // So, in order to match with rekognition results, we have to compute the same frame offset from the
            // beginning of the fragments.
            if (frame.isKeyFrame()) {
                keyFrameTimecode = frame.getTimeCode();
                log.debug("Key frame timecode : {}", keyFrameTimecode);
            }
            final long frameOffset = (frame.getTimeCode() > keyFrameTimecode) ? frame.getTimeCode() - keyFrameTimecode : 0;
            log.debug("Current Fragment Number : {} Computed Frame offset : {}", fragmentNumber, frameOffset);
            if (log.isDebugEnabled()) {
                this.rekognizedOutputs.forEach(p -> log.debug("frameOffsetInSeconds from Rekognition : {}", p.getFrameOffsetInSeconds()));
            }
            // Check whether the computed offset matches the rekognized output frame offset. Rekognition
            // output is in seconds whereas the frame offset is calculated in milliseconds.
            // NOTE: Rekognition frame offset doesn't exactly match with the computed offset below. So
            // take the closest one possible within 10ms delta.
            rekognizedOutput = this.rekognizedOutputs.stream().filter(p -> isOffsetDeltaWithinThreshold(frameOffset, p)).findFirst();
            // Remove from the index once the RekognizedOutput is processed. Else it would increase the memory
            // footprint and blow up the JVM.
            if (rekognizedOutput.isPresent()) {
                log.debug("Computed offset matched with retrieved offset. Delta : {}", Math.abs(frameOffset - (rekognizedOutput.get().getFrameOffsetInSeconds() * MILLIS_IN_SEC)));
                if (this.rekognizedOutputs.isEmpty()) {
                    log.debug("All frames processed for this fragment number : {}", fragmentNumber);
                }
            }
        }
        return rekognizedOutput;
    }

    private boolean isOffsetDeltaWithinThreshold(final long frameOffset, final RekognizedOutput output) {
        return Math.abs(frameOffset - (output.getFrameOffsetInSeconds() * MILLIS_IN_SEC)) <= OFFSET_DELTA_THRESHOLD;
    }

    @SuppressWarnings("Duplicates")
    private BufferedImage renderFrame(final BufferedImage bufferedImage, final Optional rekognizedOutput) {
        if (rekognizedOutput.isPresent()) {
            log.debug("Rendering Rekognized sampled frame...");
            boundingBoxImagePanel.processRekognitionOutput(bufferedImage.createGraphics(), bufferedImage.getWidth(), bufferedImage.getHeight(), rekognizedOutput.get());
            currentRekognizedOutput = rekognizedOutput.get();
        } else if (currentRekognizedOutput != null) {
            log.debug("Rendering non-sampled frame with previous rekognized results...");
            boundingBoxImagePanel.processRekognitionOutput(bufferedImage.createGraphics(), bufferedImage.getWidth(), bufferedImage.getHeight(), currentRekognizedOutput);
        } else {
            log.debug("Rendering frame without any rekognized results...");
        }
        return bufferedImage;
    }

    @SuppressWarnings("all")
    public void setRekognizedOutputs(final List rekognizedOutputs) {
        this.rekognizedOutputs = rekognizedOutputs;
    }

    @SuppressWarnings("all")
    public void setFrameBitRate(final int frameBitRate) {
        this.frameBitRate = frameBitRate;
    }
}