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/*
* Copyright 2021 - 2023 Anton Tananaev (anton@traccar.org)
*
* 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 org.traccar.protocol;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.model.Device;
import org.traccar.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class DualcamProtocolDecoder extends BaseProtocolDecoder {
public DualcamProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_INIT = 0;
public static final int MSG_START = 1;
public static final int MSG_RESUME = 2;
public static final int MSG_SYNC = 3;
public static final int MSG_DATA = 4;
public static final int MSG_COMPLETE = 5;
public static final int MSG_FILE_REQUEST = 8;
public static final int MSG_INIT_REQUEST = 9;
public static final int MSG_PATH_REQUEST = 0x000C;
public static final int MSG_PATH_RESPONSE = 0x000D;
private String model;
private String uniqueId;
private int dataSize;
private int dataCurrent;
private boolean video;
private ByteBuf media;
private boolean isPacketData() {
if (model == null) {
return dataSize < 8192;
} else {
return !"DSM".equals(model);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
int type = buf.readUnsignedShort();
DeviceSession deviceSession;
switch (type) {
case MSG_INIT:
buf.readUnsignedShort(); // protocol id
uniqueId = String.valueOf(buf.readLong());
deviceSession = getDeviceSession(channel, remoteAddress, uniqueId);
long settings = buf.readUnsignedInt();
if (channel != null && deviceSession != null) {
model = getCacheManager().getObject(Device.class, deviceSession.getDeviceId()).getModel();
ByteBuf response = Unpooled.buffer();
if (BitUtil.check(settings, 25)) {
response.writeShort(MSG_PATH_REQUEST);
response.writeShort(2);
response.writeShort(0);
} else if (BitUtil.between(settings, 26, 30) > 0) {
response.writeShort(MSG_FILE_REQUEST);
String file;
if (BitUtil.check(settings, 26)) {
video = false;
file = "%photof";
} else if (BitUtil.check(settings, 27)) {
video = false;
file = "%photor";
} else if (BitUtil.check(settings, 28)) {
video = true;
file = "%videof";
} else {
video = true;
file = "%videor";
}
response.writeShort(file.length());
response.writeCharSequence(file, StandardCharsets.US_ASCII);
} else {
response.writeShort(MSG_INIT);
}
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
break;
case MSG_START:
buf.readUnsignedShort(); // length
dataSize = buf.readInt();
dataCurrent = isPacketData() ? 1 : 0;
media = Unpooled.buffer();
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(MSG_RESUME);
response.writeShort(4);
response.writeInt(dataCurrent);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
break;
case MSG_DATA:
int length = buf.readUnsignedShort() - 2;
media.writeBytes(buf, length);
boolean finished;
if (isPacketData()) {
finished = dataCurrent == dataSize;
dataCurrent += 1;
} else {
finished = dataCurrent + length == dataSize;
dataCurrent += length;
}
if (finished) {
deviceSession = getDeviceSession(channel, remoteAddress);
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
getLastLocation(position, null);
try {
if (video) {
position.set(Position.KEY_VIDEO, writeMediaFile(uniqueId, media, "h265"));
} else {
position.set(Position.KEY_IMAGE, writeMediaFile(uniqueId, media, "jpg"));
}
} finally {
media.release();
media = null;
}
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(MSG_INIT_REQUEST);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
return position;
}
break;
case MSG_PATH_RESPONSE:
String file = buf.readCharSequence(buf.readUnsignedShort(), StandardCharsets.US_ASCII).toString();
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(MSG_FILE_REQUEST);
response.writeShort(file.length());
response.writeCharSequence(file, StandardCharsets.US_ASCII);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
break;
default:
break;
}
return null;
}
}
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