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diff --git a/src/common.h b/src/common.h
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+/* ------------------------------------------------------------------
+ * Copyright (C) 2016 Matthias P. Braendli
+ *
+ * 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.
+ * -------------------------------------------------------------------
+ */
+
+#pragma once
+
+// 16 bits per sample is fine for now
+#define BYTES_PER_SAMPLE 2
+
+// How many samples we insert into the queue each call
+#define NUM_SAMPLES_PER_CALL 10 // 10 samples @ 32kHz = 3.125ms
+
+//! Enumeration of encoders we can use
+enum class encoder_selection_t {
+    fdk_dabplus,
+    toolame_dab
+};
+