Added microphone TX (very basic for now)

firmware/baseband/audio_input.hpp

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
+ *
+ * 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_INPUT_H__
+#define __AUDIO_INPUT_H__
+
+#include "dsp_types.hpp"
+
+#include "dsp_iir.hpp"
+#include "dsp_squelch.hpp"
+
+#include "stream_input.hpp"
+
+#include <cstdint>
+#include <memory>
+
+class AudioInput {
+public:
+	void configure(
+		const iir_biquad_config_t& hpf_config,
+		const float squelch_threshold = 0.0f
+	);
+
+	void read_audio_buffer(buffer_s16_t& audio);
+
+	/*void set_stream(std::unique_ptr<StreamInput> new_stream) {
+		stream = std::move(new_stream);
+	}*/
+
+private:
+	static constexpr float k = 32768.0f;
+	static constexpr float ki = 1.0f / k;
+
+	IIRBiquadFilter hpf { };
+	//FMSquelch squelch { };
+
+	//std::unique_ptr<StreamInput> stream { };
+
+	//AudioStatsCollector audio_stats { };
+};
+
+#endif/*__AUDIO_INPUT_H__*/