portapack-mayhem/firmware/baseband/proc_audiotx.cpp

/*
 * 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_audiotx.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
//#include "audio_output.hpp"
#include "event_m4.hpp"

#include <cstdint>

void AudioTXProcessor::execute(const buffer_c8_t& buffer){
	
	if (!configured) return;
	
	if( stream ) {
		const size_t bytes_to_read = (buffer.count / 32);	// /32 (oversampling) should be == 64
		bytes_read += stream->read(audio_buffer.p, bytes_to_read);
	}
	
	// Fill and "stretch"
	for (size_t i = 0; i < buffer.count; i++) {
		if (!(i & 31))
			audio_sample = audio_buffer.p[i >> 5] - 0x80;
		
		sample = tone_gen.process(audio_sample);
		
		// FM
		delta = sample * 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] = { (int8_t)re, (int8_t)im };
	}
	
	spectrum_samples += buffer.count;
	if( spectrum_samples >= spectrum_interval_samples ) {
		spectrum_samples -= spectrum_interval_samples;
		
		txprogress_message.progress = bytes_read;	// Inform UI about progress
		txprogress_message.done = false;
		shared_memory.application_queue.push(txprogress_message);
	}
	
	//AudioOutput::fill_audio_buffer(preview_audio_buffer, true);
}

void AudioTXProcessor::on_message(const Message* const message) {
	switch(message->id) {
		case Message::ID::AudioTXConfig:
			audio_config(*reinterpret_cast<const AudioTXConfigMessage*>(message));
			break;

		case Message::ID::ReplayConfig:
			configured = false;
			bytes_read = 0;
			replay_config(*reinterpret_cast<const ReplayConfigMessage*>(message));
			break;
		
		case Message::ID::SamplerateConfig:
			samplerate_config(*reinterpret_cast<const SamplerateConfigMessage*>(message));
			break;
		
		case Message::ID::FIFOData:
			configured = true;
			break;
		
		default:
			break;
	}
}

void AudioTXProcessor::audio_config(const AudioTXConfigMessage& message) {
	fm_delta = message.deviation_hz * (0xFFFFFFULL / baseband_fs);
	tone_gen.configure(message.tone_key_delta, message.tone_key_mix_weight);
}

void AudioTXProcessor::samplerate_config(const SamplerateConfigMessage& message) {
	baseband_fs = message.sample_rate;
	baseband_thread.set_sampling_rate(baseband_fs);
	spectrum_interval_samples = baseband_fs / 20;
}

void AudioTXProcessor::replay_config(const ReplayConfigMessage& message) {
	if( message.config ) {
		
		stream = std::make_unique<StreamOutput>(message.config);
		
		// Tell application that the buffers and FIFO pointers are ready, prefill
		shared_memory.application_queue.push(sig_message);
	} else {
		stream.reset();
	}
}

int main() {
	EventDispatcher event_dispatcher { std::make_unique<AudioTXProcessor>() };
	event_dispatcher.run();
	return 0;
}