Extract stats collectors into separate files.

firmware/baseband/channel_stats_collector.hpp

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+/*
+ * 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 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __CHANNEL_STATS_COLLECTOR_H__
+#define __CHANNEL_STATS_COLLECTOR_H__
+
+#include "dsp_types.hpp"
+#include "message.hpp"
+#include "utility.hpp"
+
+#include <cstdint>
+#include <cstddef>
+
+class ChannelStatsCollector {
+public:
+	template<typename Callback>
+	void feed(buffer_c16_t src, Callback callback) {
+		auto src_p = src.p;
+		while(src_p < &src.p[src.count]) {
+			const uint32_t sample = *__SIMD32(src_p)++;
+			const uint32_t mag_sq = __SMUAD(sample, sample);
+			if( mag_sq > max_squared ) {
+				max_squared = mag_sq;
+			}
+		}
+		count += src.count;
+
+		const size_t samples_per_update = src.sampling_rate * update_interval;
+
+		if( count >= samples_per_update ) {
+			const float max_squared_f = max_squared;
+			const float max_db_f = complex16_mag_squared_to_dbv_norm(max_squared_f);
+			const int32_t max_db = max_db_f;
+			const ChannelStatistics statistics {
+				.max_db = max_db,
+				.count = count,
+			};
+			callback(statistics);
+
+			max_squared = 0;
+			count = 0;
+		}
+	}
+
+private:
+	static constexpr float update_interval { 0.1f };
+	uint32_t max_squared { 0 };
+	size_t count { 0 };
+};
+
+#endif/*__CHANNEL_STATS_COLLECTOR_H__*/