#1633 DMR Decoder redesign. Uses new DQPSK vector/scalar demodulator implementations and soft sync detectors for more accurate detections and symbol timing and symbol period calculations. Includes two new calibrations with scalar and vector implementations for DQPSK demodulator and Interpolator. Enhances DMR error detection and correction algorithms, specifically the block product turbo code algorithms. (#2115)

Co-authored-by: Dennis Sheirer <dsheirer@github.com>

src/main/java/io/github/dsheirer/message/EmptyTimeslotPlaceholderMessage.java

@@ -0,0 +1,102 @@
+/*
+ * *****************************************************************************
+ * Copyright (C) 2014-2024 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ * ****************************************************************************
+ */
+package io.github.dsheirer.message;
+
+import io.github.dsheirer.identifier.Identifier;
+import io.github.dsheirer.protocol.Protocol;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Empty message to convey that a number of bits were processed for an empty timeslot.
+ */
+public class EmptyTimeslotPlaceholderMessage extends Message
+{
+    private int mBitsProcessed;
+    private Protocol mProtocol;
+    private int mTimeslot = 0;
+
+    /**
+     * Constructs a sync loss message.
+     *
+     * @param timestamp of the message
+     * @param bitsProcessed without a sync pattern detection of message decode
+     * @param timeslot that lost the sync
+     */
+    public EmptyTimeslotPlaceholderMessage(long timestamp, int bitsProcessed, Protocol protocol, int timeslot)
+    {
+        super(timestamp);
+        mBitsProcessed = bitsProcessed;
+        mProtocol = protocol;
+        mTimeslot = timeslot;
+    }
+
+    /**
+     * Constructs a sync loss message.
+     *
+     * @param timestamp of the message
+     * @param bitsProcessed without a sync pattern detection of message decode
+     */
+    public EmptyTimeslotPlaceholderMessage(long timestamp, int bitsProcessed, Protocol protocol)
+    {
+        this(timestamp, bitsProcessed, protocol, 0);
+    }
+
+    /**
+     * Timeslot that lost the sync
+     * @return timeslot or a default of 0
+     */
+    @Override
+    public int getTimeslot()
+    {
+        return mTimeslot;
+    }
+
+    /**
+     * Indicates the number of bits that were processed without a sync detection or message decode
+     */
+    public int getBitsProcessed()
+    {
+        return mBitsProcessed;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "EMPTY TIMESLOT - BITS PROCESSED [" + getBitsProcessed() + "]";
+    }
+
+    @Override
+    public boolean isValid()
+    {
+        return true;
+    }
+
+    @Override
+    public Protocol getProtocol()
+    {
+        return mProtocol;
+    }
+
+    @Override
+    public List<Identifier> getIdentifiers()
+    {
+        return Collections.EMPTY_LIST;
+    }
+}