Initial firmware commit.

firmware/common/volume.hpp

@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * 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 2, 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; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Fvoranklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __VOLUME_H__
+#define __VOLUME_H__
+
+#include <cstdint>
+
+class volume_t {
+public:
+	constexpr volume_t operator-() const {
+		return { .cb = -cb };
+	}
+
+	constexpr volume_t operator+(const volume_t& other) const {
+		return { .cb = cb + other.cb };
+	}
+
+	constexpr volume_t operator-(const volume_t& other) const {
+		return { .cb = cb - other.cb };
+	}
+
+	volume_t& operator+=(const volume_t& other) {
+		cb += other.cb;
+		return *this;
+	}
+
+	constexpr bool operator<(const volume_t& other) const {
+		return cb < other.cb;
+	}
+
+	constexpr bool operator>(const volume_t& other) const {
+		return cb > other.cb;
+	}
+
+	static constexpr volume_t centibel(const int cb) {
+		return { .cb = cb };
+	}
+
+	static constexpr volume_t decibel(const int db) {
+		return { .cb = db * 10 };
+	}
+
+	int32_t centibel() const {
+		return cb;
+	}
+
+	int32_t decibel() const {
+		return cb / 10;
+	}
+
+private:
+	int32_t cb;
+
+	constexpr volume_t(
+		const int cb
+	) : cb(cb)
+	{
+	}
+};
+
+constexpr volume_t operator"" _cB(long double v) {
+	return volume_t::centibel(v);
+}
+
+constexpr volume_t operator"" _dB(long double v) {
+	return volume_t::centibel(v * 10);
+}
+
+struct volume_range_t {
+	volume_t min;
+	volume_t max;
+
+	volume_t limit(const volume_t value) const {
+		if( value < min ) {
+			return min;
+		}
+		if( value > max ) {
+			return max;
+		}
+		return value;
+	}
+
+	volume_t normalize(const volume_t value) const {
+		/* Limit volume to specified range, and adjust minimum value to 0. */
+		return limit(value) - min;
+	}
+};
+
+#endif/*__VOLUME_H__*/