Added microphone TX (very basic for now)

2026-09-02 12:59:03 +00:00 · 2017-03-12 07:10:51 +00:00
parent 2d75722b74
commit 229ec3ea75
6 changed files with 282 additions and 1 deletions
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#include "proc_mictx.hpp"
+#include "portapack_shared_memory.hpp"
+#include "sine_table_int8.hpp"
+#include "event_m4.hpp"
+
+#include <cstdint>
+
+void MicTXProcessor::execute(const buffer_c8_t& buffer){
+
+	// This is called at 1536000/2048 = 750Hz
+	
+	if (!configured) return;
+	
+	audio_input.read_audio_buffer(audio_buffer);
+
+	for (size_t i = 0; i<buffer.count; i++) {
+		
+		sample = audio_buffer.p[i >> 6] >> 8;
+		
+		power += (sample < 0) ? -sample : sample;
+		
+		if (!as) {
+			as = divider;
+			level_message.value = power / (divider / 4);
+			shared_memory.application_queue.push(level_message);
+			power = 0;
+		} else {
+			as--;
+		}
+		
+		if (ctcss_enabled) {
+			ctcss_sample = sine_table_i8[(ctcss_phase & 0xFF000000U) >> 24];
+			sample_mixed = ((sample * 205) + (ctcss_sample * 50)) / 256;	// ~20%
+			ctcss_phase += ctcss_phase_inc;
+		} else {
+			sample_mixed = sample;
+		}
+		
+		// FM
+		delta = sample_mixed * fm_delta;
+		
+		phase += delta;
+		sphase = phase + (64 << 24);
+
+		re = (sine_table_i8[(sphase & 0xFF000000U) >> 24]);
+		im = (sine_table_i8[(phase & 0xFF000000U) >> 24]);
+		
+		buffer.p[i] = {re, im};
+	}
+}
+
+void MicTXProcessor::on_message(const Message* const msg) {
+	const auto message = *reinterpret_cast<const AudioTXConfigMessage*>(msg);
+	
+	switch(msg->id) {
+		case Message::ID::AudioTXConfig:
+			fm_delta = message.fm_delta * (0xFFFFFFULL / 1536000);
+			divider = message.divider;
+			ctcss_enabled = message.ctcss_enabled;
+			ctcss_phase_inc = message.ctcss_phase_inc;
+
+			configured = true;
+			break;
+
+		default:
+			break;
+	}
+}
+
+int main() {
+	EventDispatcher event_dispatcher { std::make_unique<MicTXProcessor>() };
+	event_dispatcher.run();
+	return 0;
+}