Extract NarrowbandAMAudio class into separate files.

firmware/baseband/proc_am_audio.cpp

@@ -0,0 +1,59 @@
+/*
+ * 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.
+ */
+
+#include "proc_am_audio.hpp"
+
+#include <cstdint>
+
+void NarrowbandAMAudio::execute(buffer_c8_t buffer) {
+	auto decimator_out = decimator.execute(buffer);
+
+	const buffer_c16_t work_baseband_buffer {
+		(complex16_t*)decimator_out.p,
+		sizeof(*decimator_out.p) * decimator_out.count
+	};
+
+	/* 96kHz complex<int16_t>[64]
+	 * -> FIR filter, <?kHz (0.???fs) pass, gain 1.0
+	 * -> 48kHz int16_t[32] */
+	auto channel = channel_filter.execute(decimator_out, work_baseband_buffer);
+
+	// TODO: Feed channel_stats post-decimation data?
+	feed_channel_stats(channel);
+	feed_channel_spectrum(
+		channel,
+		decimator_out.sampling_rate * channel_filter_taps.pass_frequency_normalized,
+		decimator_out.sampling_rate * channel_filter_taps.stop_frequency_normalized
+	);
+
+	const buffer_s16_t work_audio_buffer {
+		(int16_t*)decimator_out.p,
+		sizeof(*decimator_out.p) * decimator_out.count
+	};
+
+	/* 48kHz complex<int16_t>[32]
+	 * -> AM demodulation
+	 * -> 48kHz int16_t[32] */
+	auto audio = demod.execute(channel, work_audio_buffer);
+
+	audio_hpf.execute_in_place(audio);
+	fill_audio_buffer(audio);
+}