Extract stats collectors into separate files.

firmware/baseband/audio_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 __AUDIO_STATS_COLLECTOR_H__
+#define __AUDIO_STATS_COLLECTOR_H__
+
+#include "buffer.hpp"
+#include "message.hpp"
+#include "utility.hpp"
+
+#include <cstdint>
+#include <cstddef>
+
+class AudioStatsCollector {
+public:
+	template<typename Callback>
+	void feed(buffer_s16_t src, Callback callback) {
+		consume_audio_buffer(src);
+
+		if( update_stats(src.count, src.sampling_rate) ) {
+			callback(statistics);
+		}
+	}
+
+	template<typename Callback>
+	void mute(const size_t sample_count, const size_t sampling_rate, Callback callback) {
+		if( update_stats(sample_count, sampling_rate) ) {
+			callback(statistics);
+		}
+	}
+
+private:
+	static constexpr float update_interval { 0.1f };
+	uint64_t squared_sum { 0 };
+	uint32_t max_squared { 0 };
+	size_t count { 0 };
+
+	AudioStatistics statistics;
+
+	void consume_audio_buffer(buffer_s16_t src) {
+		auto src_p = src.p;
+		const auto src_end = &src.p[src.count];
+		while(src_p < src_end) {
+			const auto sample = *(src_p++);
+			const uint64_t sample_squared = sample * sample;
+			squared_sum += sample_squared;
+			if( sample_squared > max_squared ) {
+				max_squared = sample_squared;
+			}
+		}
+	}
+
+	bool update_stats(const size_t sample_count, const size_t sampling_rate) {
+		count += sample_count;
+
+		const size_t samples_per_update = sampling_rate * update_interval;
+
+		if( count >= samples_per_update ) {
+			const float squared_sum_f = squared_sum;
+			const float max_squared_f = max_squared;
+			const float squared_avg_f = squared_sum_f / count;
+			statistics.rms_db = complex16_mag_squared_to_dbv_norm(squared_avg_f);
+			statistics.max_db = complex16_mag_squared_to_dbv_norm(max_squared_f);
+			statistics.count = count;
+
+			squared_sum = 0;
+			max_squared = 0;
+			count = 0;
+
+			return true;
+		} else {
+			return false;
+		}
+	}
+};
+
+#endif/*__AUDIO_STATS_COLLECTOR_H__*/