#1351 Restores semi-accurate timestamps of sample buffers to ensure P25 & DMR decoded messages have accurate timestamps and MBE recording voice frames have accurate timestamps. (#1357)

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

src/main/java/io/github/dsheirer/buffer/AbstractNativeBufferFactory.java

@@ -0,0 +1,44 @@
+/*
+ * *****************************************************************************
+ * Copyright (C) 2014-2022 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.buffer;
+
+/**
+ * Base class for native buffer factories.
+ */
+public abstract class AbstractNativeBufferFactory implements INativeBufferFactory
+{
+    private float mSamplesPerMillisecond = 0.0f;
+
+    @Override
+    public void setSamplesPerMillisecond(float samplesPerMillisecond)
+    {
+        mSamplesPerMillisecond = samplesPerMillisecond;
+    }
+
+    /**
+     * Quantity of I/Q sample pairs per milli-second at the current sample rate to use in calculating an accurate
+     * timestamp for sub-buffer that are generated from the native buffer.
+     * @return samples per millisecond.
+     */
+    public float getSamplesPerMillisecond()
+    {
+        return mSamplesPerMillisecond;
+    }
+}